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2637 lines
79 KiB
2637 lines
79 KiB
// Copyright 2013 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package promql
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import (
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"bytes"
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"container/heap"
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"context"
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"fmt"
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"math"
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"reflect"
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"regexp"
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"runtime"
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"sort"
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"strconv"
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"sync"
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"time"
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"github.com/go-kit/log"
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"github.com/go-kit/log/level"
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"github.com/pkg/errors"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/model"
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"go.opentelemetry.io/otel"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/trace"
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"github.com/prometheus/prometheus/model/labels"
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"github.com/prometheus/prometheus/model/timestamp"
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"github.com/prometheus/prometheus/model/value"
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"github.com/prometheus/prometheus/promql/parser"
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"github.com/prometheus/prometheus/storage"
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"github.com/prometheus/prometheus/util/stats"
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)
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const (
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namespace = "prometheus"
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subsystem = "engine"
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queryTag = "query"
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env = "query execution"
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defaultLookbackDelta = 5 * time.Minute
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// The largest SampleValue that can be converted to an int64 without overflow.
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maxInt64 = 9223372036854774784
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// The smallest SampleValue that can be converted to an int64 without underflow.
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minInt64 = -9223372036854775808
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)
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type engineMetrics struct {
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currentQueries prometheus.Gauge
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maxConcurrentQueries prometheus.Gauge
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queryLogEnabled prometheus.Gauge
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queryLogFailures prometheus.Counter
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queryQueueTime prometheus.Observer
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queryPrepareTime prometheus.Observer
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queryInnerEval prometheus.Observer
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queryResultSort prometheus.Observer
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}
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// convertibleToInt64 returns true if v does not over-/underflow an int64.
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func convertibleToInt64(v float64) bool {
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return v <= maxInt64 && v >= minInt64
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}
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type (
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// ErrQueryTimeout is returned if a query timed out during processing.
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ErrQueryTimeout string
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// ErrQueryCanceled is returned if a query was canceled during processing.
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ErrQueryCanceled string
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// ErrTooManySamples is returned if a query would load more than the maximum allowed samples into memory.
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ErrTooManySamples string
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// ErrStorage is returned if an error was encountered in the storage layer
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// during query handling.
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ErrStorage struct{ Err error }
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)
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func (e ErrQueryTimeout) Error() string {
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return fmt.Sprintf("query timed out in %s", string(e))
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}
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func (e ErrQueryCanceled) Error() string {
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return fmt.Sprintf("query was canceled in %s", string(e))
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}
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func (e ErrTooManySamples) Error() string {
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return fmt.Sprintf("query processing would load too many samples into memory in %s", string(e))
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}
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func (e ErrStorage) Error() string {
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return e.Err.Error()
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}
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// QueryLogger is an interface that can be used to log all the queries logged
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// by the engine.
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type QueryLogger interface {
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Log(...interface{}) error
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Close() error
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}
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// A Query is derived from an a raw query string and can be run against an engine
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// it is associated with.
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type Query interface {
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// Exec processes the query. Can only be called once.
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Exec(ctx context.Context) *Result
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// Close recovers memory used by the query result.
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Close()
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// Statement returns the parsed statement of the query.
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Statement() parser.Statement
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// Stats returns statistics about the lifetime of the query.
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Stats() *stats.QueryTimers
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// Cancel signals that a running query execution should be aborted.
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Cancel()
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// String returns the original query string.
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String() string
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}
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// query implements the Query interface.
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type query struct {
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// Underlying data provider.
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queryable storage.Queryable
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// The original query string.
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q string
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// Statement of the parsed query.
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stmt parser.Statement
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// Timer stats for the query execution.
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stats *stats.QueryTimers
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// Result matrix for reuse.
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matrix Matrix
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// Cancellation function for the query.
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cancel func()
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// The engine against which the query is executed.
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ng *Engine
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}
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type QueryOrigin struct{}
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// Statement implements the Query interface.
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// Calling this after Exec may result in panic,
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// see https://github.com/prometheus/prometheus/issues/8949.
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func (q *query) Statement() parser.Statement {
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return q.stmt
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}
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// String implements the Query interface.
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func (q *query) String() string {
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return q.q
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}
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// Stats implements the Query interface.
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func (q *query) Stats() *stats.QueryTimers {
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return q.stats
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}
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// Cancel implements the Query interface.
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func (q *query) Cancel() {
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if q.cancel != nil {
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q.cancel()
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}
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}
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// Close implements the Query interface.
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func (q *query) Close() {
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for _, s := range q.matrix {
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putPointSlice(s.Points)
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}
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}
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// Exec implements the Query interface.
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func (q *query) Exec(ctx context.Context) *Result {
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if span := trace.SpanFromContext(ctx); span != nil {
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span.SetAttributes(attribute.String(queryTag, q.stmt.String()))
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}
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// Exec query.
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res, warnings, err := q.ng.exec(ctx, q)
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return &Result{Err: err, Value: res, Warnings: warnings}
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}
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// contextDone returns an error if the context was canceled or timed out.
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func contextDone(ctx context.Context, env string) error {
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if err := ctx.Err(); err != nil {
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return contextErr(err, env)
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}
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return nil
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}
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func contextErr(err error, env string) error {
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switch err {
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case context.Canceled:
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return ErrQueryCanceled(env)
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case context.DeadlineExceeded:
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return ErrQueryTimeout(env)
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default:
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return err
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}
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}
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// QueryTracker provides access to two features:
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//
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// 1) Tracking of active query. If PromQL engine crashes while executing any query, such query should be present
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// in the tracker on restart, hence logged. After the logging on restart, the tracker gets emptied.
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//
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// 2) Enforcement of the maximum number of concurrent queries.
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type QueryTracker interface {
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// GetMaxConcurrent returns maximum number of concurrent queries that are allowed by this tracker.
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GetMaxConcurrent() int
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// Insert inserts query into query tracker. This call must block if maximum number of queries is already running.
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// If Insert doesn't return error then returned integer value should be used in subsequent Delete call.
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// Insert should return error if context is finished before query can proceed, and integer value returned in this case should be ignored by caller.
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Insert(ctx context.Context, query string) (int, error)
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// Delete removes query from activity tracker. InsertIndex is value returned by Insert call.
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Delete(insertIndex int)
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}
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// EngineOpts contains configuration options used when creating a new Engine.
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type EngineOpts struct {
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Logger log.Logger
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Reg prometheus.Registerer
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MaxSamples int
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Timeout time.Duration
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ActiveQueryTracker QueryTracker
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// LookbackDelta determines the time since the last sample after which a time
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// series is considered stale.
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LookbackDelta time.Duration
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// NoStepSubqueryIntervalFn is the default evaluation interval of
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// a subquery in milliseconds if no step in range vector was specified `[30m:<step>]`.
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NoStepSubqueryIntervalFn func(rangeMillis int64) int64
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// EnableAtModifier if true enables @ modifier. Disabled otherwise. This
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// is supposed to be enabled for regular PromQL (as of Prometheus v2.33)
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// but the option to disable it is still provided here for those using
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// the Engine outside of Prometheus.
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EnableAtModifier bool
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// EnableNegativeOffset if true enables negative (-) offset
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// values. Disabled otherwise. This is supposed to be enabled for
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// regular PromQL (as of Prometheus v2.33) but the option to disable it
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// is still provided here for those using the Engine outside of
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// Prometheus.
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EnableNegativeOffset bool
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}
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// Engine handles the lifetime of queries from beginning to end.
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// It is connected to a querier.
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type Engine struct {
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logger log.Logger
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metrics *engineMetrics
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timeout time.Duration
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maxSamplesPerQuery int
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activeQueryTracker QueryTracker
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queryLogger QueryLogger
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queryLoggerLock sync.RWMutex
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lookbackDelta time.Duration
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noStepSubqueryIntervalFn func(rangeMillis int64) int64
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enableAtModifier bool
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enableNegativeOffset bool
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}
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// NewEngine returns a new engine.
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func NewEngine(opts EngineOpts) *Engine {
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if opts.Logger == nil {
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opts.Logger = log.NewNopLogger()
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}
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queryResultSummary := prometheus.NewSummaryVec(prometheus.SummaryOpts{
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Namespace: namespace,
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Subsystem: subsystem,
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Name: "query_duration_seconds",
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Help: "Query timings",
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Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
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},
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[]string{"slice"},
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)
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metrics := &engineMetrics{
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currentQueries: prometheus.NewGauge(prometheus.GaugeOpts{
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Namespace: namespace,
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Subsystem: subsystem,
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Name: "queries",
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Help: "The current number of queries being executed or waiting.",
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}),
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queryLogEnabled: prometheus.NewGauge(prometheus.GaugeOpts{
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Namespace: namespace,
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Subsystem: subsystem,
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Name: "query_log_enabled",
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Help: "State of the query log.",
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}),
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queryLogFailures: prometheus.NewCounter(prometheus.CounterOpts{
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Namespace: namespace,
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Subsystem: subsystem,
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Name: "query_log_failures_total",
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Help: "The number of query log failures.",
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}),
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maxConcurrentQueries: prometheus.NewGauge(prometheus.GaugeOpts{
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Namespace: namespace,
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Subsystem: subsystem,
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Name: "queries_concurrent_max",
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Help: "The max number of concurrent queries.",
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}),
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queryQueueTime: queryResultSummary.WithLabelValues("queue_time"),
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queryPrepareTime: queryResultSummary.WithLabelValues("prepare_time"),
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queryInnerEval: queryResultSummary.WithLabelValues("inner_eval"),
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queryResultSort: queryResultSummary.WithLabelValues("result_sort"),
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}
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if t := opts.ActiveQueryTracker; t != nil {
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metrics.maxConcurrentQueries.Set(float64(t.GetMaxConcurrent()))
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} else {
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metrics.maxConcurrentQueries.Set(-1)
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}
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if opts.LookbackDelta == 0 {
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opts.LookbackDelta = defaultLookbackDelta
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if l := opts.Logger; l != nil {
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level.Debug(l).Log("msg", "Lookback delta is zero, setting to default value", "value", defaultLookbackDelta)
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}
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}
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if opts.Reg != nil {
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opts.Reg.MustRegister(
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metrics.currentQueries,
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metrics.maxConcurrentQueries,
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metrics.queryLogEnabled,
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metrics.queryLogFailures,
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queryResultSummary,
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)
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}
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return &Engine{
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timeout: opts.Timeout,
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logger: opts.Logger,
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metrics: metrics,
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maxSamplesPerQuery: opts.MaxSamples,
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activeQueryTracker: opts.ActiveQueryTracker,
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lookbackDelta: opts.LookbackDelta,
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noStepSubqueryIntervalFn: opts.NoStepSubqueryIntervalFn,
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enableAtModifier: opts.EnableAtModifier,
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enableNegativeOffset: opts.EnableNegativeOffset,
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}
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}
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// SetQueryLogger sets the query logger.
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func (ng *Engine) SetQueryLogger(l QueryLogger) {
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ng.queryLoggerLock.Lock()
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defer ng.queryLoggerLock.Unlock()
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if ng.queryLogger != nil {
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// An error closing the old file descriptor should
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// not make reload fail; only log a warning.
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err := ng.queryLogger.Close()
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if err != nil {
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level.Warn(ng.logger).Log("msg", "Error while closing the previous query log file", "err", err)
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}
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}
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ng.queryLogger = l
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if l != nil {
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ng.metrics.queryLogEnabled.Set(1)
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} else {
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ng.metrics.queryLogEnabled.Set(0)
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}
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}
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// NewInstantQuery returns an evaluation query for the given expression at the given time.
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func (ng *Engine) NewInstantQuery(q storage.Queryable, qs string, ts time.Time) (Query, error) {
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expr, err := parser.ParseExpr(qs)
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if err != nil {
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return nil, err
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}
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qry, err := ng.newQuery(q, expr, ts, ts, 0)
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if err != nil {
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return nil, err
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}
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qry.q = qs
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return qry, nil
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}
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// NewRangeQuery returns an evaluation query for the given time range and with
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// the resolution set by the interval.
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func (ng *Engine) NewRangeQuery(q storage.Queryable, qs string, start, end time.Time, interval time.Duration) (Query, error) {
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expr, err := parser.ParseExpr(qs)
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if err != nil {
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return nil, err
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}
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if expr.Type() != parser.ValueTypeVector && expr.Type() != parser.ValueTypeScalar {
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return nil, errors.Errorf("invalid expression type %q for range query, must be Scalar or instant Vector", parser.DocumentedType(expr.Type()))
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}
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qry, err := ng.newQuery(q, expr, start, end, interval)
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if err != nil {
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return nil, err
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}
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qry.q = qs
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return qry, nil
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}
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func (ng *Engine) newQuery(q storage.Queryable, expr parser.Expr, start, end time.Time, interval time.Duration) (*query, error) {
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if err := ng.validateOpts(expr); err != nil {
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return nil, err
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}
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es := &parser.EvalStmt{
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Expr: PreprocessExpr(expr, start, end),
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Start: start,
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End: end,
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Interval: interval,
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}
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qry := &query{
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stmt: es,
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ng: ng,
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stats: stats.NewQueryTimers(),
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queryable: q,
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}
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return qry, nil
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}
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var (
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ErrValidationAtModifierDisabled = errors.New("@ modifier is disabled")
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ErrValidationNegativeOffsetDisabled = errors.New("negative offset is disabled")
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)
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func (ng *Engine) validateOpts(expr parser.Expr) error {
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if ng.enableAtModifier && ng.enableNegativeOffset {
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return nil
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}
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var atModifierUsed, negativeOffsetUsed bool
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var validationErr error
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parser.Inspect(expr, func(node parser.Node, path []parser.Node) error {
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switch n := node.(type) {
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case *parser.VectorSelector:
|
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if n.Timestamp != nil || n.StartOrEnd == parser.START || n.StartOrEnd == parser.END {
|
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atModifierUsed = true
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}
|
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if n.OriginalOffset < 0 {
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negativeOffsetUsed = true
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}
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|
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case *parser.MatrixSelector:
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vs := n.VectorSelector.(*parser.VectorSelector)
|
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if vs.Timestamp != nil || vs.StartOrEnd == parser.START || vs.StartOrEnd == parser.END {
|
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atModifierUsed = true
|
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}
|
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if vs.OriginalOffset < 0 {
|
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negativeOffsetUsed = true
|
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}
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|
|
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case *parser.SubqueryExpr:
|
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if n.Timestamp != nil || n.StartOrEnd == parser.START || n.StartOrEnd == parser.END {
|
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atModifierUsed = true
|
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}
|
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if n.OriginalOffset < 0 {
|
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negativeOffsetUsed = true
|
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}
|
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}
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|
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if atModifierUsed && !ng.enableAtModifier {
|
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validationErr = ErrValidationAtModifierDisabled
|
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return validationErr
|
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}
|
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if negativeOffsetUsed && !ng.enableNegativeOffset {
|
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validationErr = ErrValidationNegativeOffsetDisabled
|
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return validationErr
|
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}
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|
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return nil
|
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})
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|
|
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return validationErr
|
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}
|
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|
|
func (ng *Engine) newTestQuery(f func(context.Context) error) Query {
|
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qry := &query{
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q: "test statement",
|
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stmt: parser.TestStmt(f),
|
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ng: ng,
|
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stats: stats.NewQueryTimers(),
|
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}
|
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return qry
|
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}
|
|
|
|
// exec executes the query.
|
|
//
|
|
// At this point per query only one EvalStmt is evaluated. Alert and record
|
|
// statements are not handled by the Engine.
|
|
func (ng *Engine) exec(ctx context.Context, q *query) (v parser.Value, ws storage.Warnings, err error) {
|
|
ng.metrics.currentQueries.Inc()
|
|
defer ng.metrics.currentQueries.Dec()
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|
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ctx, cancel := context.WithTimeout(ctx, ng.timeout)
|
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q.cancel = cancel
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|
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defer func() {
|
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ng.queryLoggerLock.RLock()
|
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if l := ng.queryLogger; l != nil {
|
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params := make(map[string]interface{}, 4)
|
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params["query"] = q.q
|
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if eq, ok := q.Statement().(*parser.EvalStmt); ok {
|
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params["start"] = formatDate(eq.Start)
|
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params["end"] = formatDate(eq.End)
|
|
// The step provided by the user is in seconds.
|
|
params["step"] = int64(eq.Interval / (time.Second / time.Nanosecond))
|
|
}
|
|
f := []interface{}{"params", params}
|
|
if err != nil {
|
|
f = append(f, "error", err)
|
|
}
|
|
f = append(f, "stats", stats.NewQueryStats(q.Stats()))
|
|
if span := trace.SpanFromContext(ctx); span != nil {
|
|
f = append(f, "spanID", span.SpanContext().SpanID())
|
|
}
|
|
if origin := ctx.Value(QueryOrigin{}); origin != nil {
|
|
for k, v := range origin.(map[string]interface{}) {
|
|
f = append(f, k, v)
|
|
}
|
|
}
|
|
if err := l.Log(f...); err != nil {
|
|
ng.metrics.queryLogFailures.Inc()
|
|
level.Error(ng.logger).Log("msg", "can't log query", "err", err)
|
|
}
|
|
}
|
|
ng.queryLoggerLock.RUnlock()
|
|
}()
|
|
|
|
execSpanTimer, ctx := q.stats.GetSpanTimer(ctx, stats.ExecTotalTime)
|
|
defer execSpanTimer.Finish()
|
|
|
|
queueSpanTimer, _ := q.stats.GetSpanTimer(ctx, stats.ExecQueueTime, ng.metrics.queryQueueTime)
|
|
// Log query in active log. The active log guarantees that we don't run over
|
|
// MaxConcurrent queries.
|
|
if ng.activeQueryTracker != nil {
|
|
queryIndex, err := ng.activeQueryTracker.Insert(ctx, q.q)
|
|
if err != nil {
|
|
queueSpanTimer.Finish()
|
|
return nil, nil, contextErr(err, "query queue")
|
|
}
|
|
defer ng.activeQueryTracker.Delete(queryIndex)
|
|
}
|
|
queueSpanTimer.Finish()
|
|
|
|
// Cancel when execution is done or an error was raised.
|
|
defer q.cancel()
|
|
|
|
evalSpanTimer, ctx := q.stats.GetSpanTimer(ctx, stats.EvalTotalTime)
|
|
defer evalSpanTimer.Finish()
|
|
|
|
// The base context might already be canceled on the first iteration (e.g. during shutdown).
|
|
if err := contextDone(ctx, env); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
switch s := q.Statement().(type) {
|
|
case *parser.EvalStmt:
|
|
return ng.execEvalStmt(ctx, q, s)
|
|
case parser.TestStmt:
|
|
return nil, nil, s(ctx)
|
|
}
|
|
|
|
panic(errors.Errorf("promql.Engine.exec: unhandled statement of type %T", q.Statement()))
|
|
}
|
|
|
|
func timeMilliseconds(t time.Time) int64 {
|
|
return t.UnixNano() / int64(time.Millisecond/time.Nanosecond)
|
|
}
|
|
|
|
func durationMilliseconds(d time.Duration) int64 {
|
|
return int64(d / (time.Millisecond / time.Nanosecond))
|
|
}
|
|
|
|
// execEvalStmt evaluates the expression of an evaluation statement for the given time range.
|
|
func (ng *Engine) execEvalStmt(ctx context.Context, query *query, s *parser.EvalStmt) (parser.Value, storage.Warnings, error) {
|
|
prepareSpanTimer, ctxPrepare := query.stats.GetSpanTimer(ctx, stats.QueryPreparationTime, ng.metrics.queryPrepareTime)
|
|
mint, maxt := ng.findMinMaxTime(s)
|
|
querier, err := query.queryable.Querier(ctxPrepare, mint, maxt)
|
|
if err != nil {
|
|
prepareSpanTimer.Finish()
|
|
return nil, nil, err
|
|
}
|
|
defer querier.Close()
|
|
|
|
ng.populateSeries(querier, s)
|
|
prepareSpanTimer.Finish()
|
|
|
|
// Modify the offset of vector and matrix selectors for the @ modifier
|
|
// w.r.t. the start time since only 1 evaluation will be done on them.
|
|
setOffsetForAtModifier(timeMilliseconds(s.Start), s.Expr)
|
|
evalSpanTimer, ctxInnerEval := query.stats.GetSpanTimer(ctx, stats.InnerEvalTime, ng.metrics.queryInnerEval)
|
|
// Instant evaluation. This is executed as a range evaluation with one step.
|
|
if s.Start == s.End && s.Interval == 0 {
|
|
start := timeMilliseconds(s.Start)
|
|
evaluator := &evaluator{
|
|
startTimestamp: start,
|
|
endTimestamp: start,
|
|
interval: 1,
|
|
ctx: ctxInnerEval,
|
|
maxSamples: ng.maxSamplesPerQuery,
|
|
logger: ng.logger,
|
|
lookbackDelta: ng.lookbackDelta,
|
|
noStepSubqueryIntervalFn: ng.noStepSubqueryIntervalFn,
|
|
}
|
|
|
|
val, warnings, err := evaluator.Eval(s.Expr)
|
|
if err != nil {
|
|
return nil, warnings, err
|
|
}
|
|
|
|
evalSpanTimer.Finish()
|
|
|
|
var mat Matrix
|
|
|
|
switch result := val.(type) {
|
|
case Matrix:
|
|
mat = result
|
|
case String:
|
|
return result, warnings, nil
|
|
default:
|
|
panic(errors.Errorf("promql.Engine.exec: invalid expression type %q", val.Type()))
|
|
}
|
|
|
|
query.matrix = mat
|
|
switch s.Expr.Type() {
|
|
case parser.ValueTypeVector:
|
|
// Convert matrix with one value per series into vector.
|
|
vector := make(Vector, len(mat))
|
|
for i, s := range mat {
|
|
// Point might have a different timestamp, force it to the evaluation
|
|
// timestamp as that is when we ran the evaluation.
|
|
vector[i] = Sample{Metric: s.Metric, Point: Point{V: s.Points[0].V, T: start}}
|
|
}
|
|
return vector, warnings, nil
|
|
case parser.ValueTypeScalar:
|
|
return Scalar{V: mat[0].Points[0].V, T: start}, warnings, nil
|
|
case parser.ValueTypeMatrix:
|
|
return mat, warnings, nil
|
|
default:
|
|
panic(errors.Errorf("promql.Engine.exec: unexpected expression type %q", s.Expr.Type()))
|
|
}
|
|
}
|
|
|
|
// Range evaluation.
|
|
evaluator := &evaluator{
|
|
startTimestamp: timeMilliseconds(s.Start),
|
|
endTimestamp: timeMilliseconds(s.End),
|
|
interval: durationMilliseconds(s.Interval),
|
|
ctx: ctxInnerEval,
|
|
maxSamples: ng.maxSamplesPerQuery,
|
|
logger: ng.logger,
|
|
lookbackDelta: ng.lookbackDelta,
|
|
noStepSubqueryIntervalFn: ng.noStepSubqueryIntervalFn,
|
|
}
|
|
val, warnings, err := evaluator.Eval(s.Expr)
|
|
if err != nil {
|
|
return nil, warnings, err
|
|
}
|
|
evalSpanTimer.Finish()
|
|
|
|
mat, ok := val.(Matrix)
|
|
if !ok {
|
|
panic(errors.Errorf("promql.Engine.exec: invalid expression type %q", val.Type()))
|
|
}
|
|
query.matrix = mat
|
|
|
|
if err := contextDone(ctx, "expression evaluation"); err != nil {
|
|
return nil, warnings, err
|
|
}
|
|
|
|
// TODO(fabxc): where to ensure metric labels are a copy from the storage internals.
|
|
sortSpanTimer, _ := query.stats.GetSpanTimer(ctx, stats.ResultSortTime, ng.metrics.queryResultSort)
|
|
sort.Sort(mat)
|
|
sortSpanTimer.Finish()
|
|
|
|
return mat, warnings, nil
|
|
}
|
|
|
|
// subqueryTimes returns the sum of offsets and ranges of all subqueries in the path.
|
|
// If the @ modifier is used, then the offset and range is w.r.t. that timestamp
|
|
// (i.e. the sum is reset when we have @ modifier).
|
|
// The returned *int64 is the closest timestamp that was seen. nil for no @ modifier.
|
|
func subqueryTimes(path []parser.Node) (time.Duration, time.Duration, *int64) {
|
|
var (
|
|
subqOffset, subqRange time.Duration
|
|
ts int64 = math.MaxInt64
|
|
)
|
|
for _, node := range path {
|
|
switch n := node.(type) {
|
|
case *parser.SubqueryExpr:
|
|
subqOffset += n.OriginalOffset
|
|
subqRange += n.Range
|
|
if n.Timestamp != nil {
|
|
// The @ modifier on subquery invalidates all the offset and
|
|
// range till now. Hence resetting it here.
|
|
subqOffset = n.OriginalOffset
|
|
subqRange = n.Range
|
|
ts = *n.Timestamp
|
|
}
|
|
}
|
|
}
|
|
var tsp *int64
|
|
if ts != math.MaxInt64 {
|
|
tsp = &ts
|
|
}
|
|
return subqOffset, subqRange, tsp
|
|
}
|
|
|
|
func (ng *Engine) findMinMaxTime(s *parser.EvalStmt) (int64, int64) {
|
|
var minTimestamp, maxTimestamp int64 = math.MaxInt64, math.MinInt64
|
|
// Whenever a MatrixSelector is evaluated, evalRange is set to the corresponding range.
|
|
// The evaluation of the VectorSelector inside then evaluates the given range and unsets
|
|
// the variable.
|
|
var evalRange time.Duration
|
|
parser.Inspect(s.Expr, func(node parser.Node, path []parser.Node) error {
|
|
switch n := node.(type) {
|
|
case *parser.VectorSelector:
|
|
start, end := ng.getTimeRangesForSelector(s, n, path, evalRange)
|
|
if start < minTimestamp {
|
|
minTimestamp = start
|
|
}
|
|
if end > maxTimestamp {
|
|
maxTimestamp = end
|
|
}
|
|
evalRange = 0
|
|
|
|
case *parser.MatrixSelector:
|
|
evalRange = n.Range
|
|
}
|
|
return nil
|
|
})
|
|
|
|
if maxTimestamp == math.MinInt64 {
|
|
// This happens when there was no selector. Hence no time range to select.
|
|
minTimestamp = 0
|
|
maxTimestamp = 0
|
|
}
|
|
|
|
return minTimestamp, maxTimestamp
|
|
}
|
|
|
|
func (ng *Engine) getTimeRangesForSelector(s *parser.EvalStmt, n *parser.VectorSelector, path []parser.Node, evalRange time.Duration) (int64, int64) {
|
|
start, end := timestamp.FromTime(s.Start), timestamp.FromTime(s.End)
|
|
subqOffset, subqRange, subqTs := subqueryTimes(path)
|
|
|
|
if subqTs != nil {
|
|
// The timestamp on the subquery overrides the eval statement time ranges.
|
|
start = *subqTs
|
|
end = *subqTs
|
|
}
|
|
|
|
if n.Timestamp != nil {
|
|
// The timestamp on the selector overrides everything.
|
|
start = *n.Timestamp
|
|
end = *n.Timestamp
|
|
} else {
|
|
offsetMilliseconds := durationMilliseconds(subqOffset)
|
|
start = start - offsetMilliseconds - durationMilliseconds(subqRange)
|
|
end = end - offsetMilliseconds
|
|
}
|
|
|
|
if evalRange == 0 {
|
|
start = start - durationMilliseconds(ng.lookbackDelta)
|
|
} else {
|
|
// For all matrix queries we want to ensure that we have (end-start) + range selected
|
|
// this way we have `range` data before the start time
|
|
start = start - durationMilliseconds(evalRange)
|
|
}
|
|
|
|
offsetMilliseconds := durationMilliseconds(n.OriginalOffset)
|
|
start = start - offsetMilliseconds
|
|
end = end - offsetMilliseconds
|
|
|
|
return start, end
|
|
}
|
|
|
|
func (ng *Engine) populateSeries(querier storage.Querier, s *parser.EvalStmt) {
|
|
// Whenever a MatrixSelector is evaluated, evalRange is set to the corresponding range.
|
|
// The evaluation of the VectorSelector inside then evaluates the given range and unsets
|
|
// the variable.
|
|
var evalRange time.Duration
|
|
|
|
parser.Inspect(s.Expr, func(node parser.Node, path []parser.Node) error {
|
|
switch n := node.(type) {
|
|
case *parser.VectorSelector:
|
|
start, end := ng.getTimeRangesForSelector(s, n, path, evalRange)
|
|
hints := &storage.SelectHints{
|
|
Start: start,
|
|
End: end,
|
|
Step: durationMilliseconds(s.Interval),
|
|
Range: durationMilliseconds(evalRange),
|
|
Func: extractFuncFromPath(path),
|
|
}
|
|
evalRange = 0
|
|
hints.By, hints.Grouping = extractGroupsFromPath(path)
|
|
n.UnexpandedSeriesSet = querier.Select(false, hints, n.LabelMatchers...)
|
|
|
|
case *parser.MatrixSelector:
|
|
evalRange = n.Range
|
|
}
|
|
return nil
|
|
})
|
|
}
|
|
|
|
// extractFuncFromPath walks up the path and searches for the first instance of
|
|
// a function or aggregation.
|
|
func extractFuncFromPath(p []parser.Node) string {
|
|
if len(p) == 0 {
|
|
return ""
|
|
}
|
|
switch n := p[len(p)-1].(type) {
|
|
case *parser.AggregateExpr:
|
|
return n.Op.String()
|
|
case *parser.Call:
|
|
return n.Func.Name
|
|
case *parser.BinaryExpr:
|
|
// If we hit a binary expression we terminate since we only care about functions
|
|
// or aggregations over a single metric.
|
|
return ""
|
|
}
|
|
return extractFuncFromPath(p[:len(p)-1])
|
|
}
|
|
|
|
// extractGroupsFromPath parses vector outer function and extracts grouping information if by or without was used.
|
|
func extractGroupsFromPath(p []parser.Node) (bool, []string) {
|
|
if len(p) == 0 {
|
|
return false, nil
|
|
}
|
|
switch n := p[len(p)-1].(type) {
|
|
case *parser.AggregateExpr:
|
|
return !n.Without, n.Grouping
|
|
}
|
|
return false, nil
|
|
}
|
|
|
|
func checkAndExpandSeriesSet(ctx context.Context, expr parser.Expr) (storage.Warnings, error) {
|
|
switch e := expr.(type) {
|
|
case *parser.MatrixSelector:
|
|
return checkAndExpandSeriesSet(ctx, e.VectorSelector)
|
|
case *parser.VectorSelector:
|
|
if e.Series != nil {
|
|
return nil, nil
|
|
}
|
|
series, ws, err := expandSeriesSet(ctx, e.UnexpandedSeriesSet)
|
|
e.Series = series
|
|
return ws, err
|
|
}
|
|
return nil, nil
|
|
}
|
|
|
|
func expandSeriesSet(ctx context.Context, it storage.SeriesSet) (res []storage.Series, ws storage.Warnings, err error) {
|
|
for it.Next() {
|
|
select {
|
|
case <-ctx.Done():
|
|
return nil, nil, ctx.Err()
|
|
default:
|
|
}
|
|
res = append(res, it.At())
|
|
}
|
|
return res, it.Warnings(), it.Err()
|
|
}
|
|
|
|
type errWithWarnings struct {
|
|
err error
|
|
warnings storage.Warnings
|
|
}
|
|
|
|
func (e errWithWarnings) Error() string { return e.err.Error() }
|
|
|
|
// An evaluator evaluates given expressions over given fixed timestamps. It
|
|
// is attached to an engine through which it connects to a querier and reports
|
|
// errors. On timeout or cancellation of its context it terminates.
|
|
type evaluator struct {
|
|
ctx context.Context
|
|
|
|
startTimestamp int64 // Start time in milliseconds.
|
|
endTimestamp int64 // End time in milliseconds.
|
|
interval int64 // Interval in milliseconds.
|
|
|
|
maxSamples int
|
|
currentSamples int
|
|
logger log.Logger
|
|
lookbackDelta time.Duration
|
|
noStepSubqueryIntervalFn func(rangeMillis int64) int64
|
|
}
|
|
|
|
// errorf causes a panic with the input formatted into an error.
|
|
func (ev *evaluator) errorf(format string, args ...interface{}) {
|
|
ev.error(errors.Errorf(format, args...))
|
|
}
|
|
|
|
// error causes a panic with the given error.
|
|
func (ev *evaluator) error(err error) {
|
|
panic(err)
|
|
}
|
|
|
|
// recover is the handler that turns panics into returns from the top level of evaluation.
|
|
func (ev *evaluator) recover(ws *storage.Warnings, errp *error) {
|
|
e := recover()
|
|
if e == nil {
|
|
return
|
|
}
|
|
|
|
switch err := e.(type) {
|
|
case runtime.Error:
|
|
// Print the stack trace but do not inhibit the running application.
|
|
buf := make([]byte, 64<<10)
|
|
buf = buf[:runtime.Stack(buf, false)]
|
|
|
|
level.Error(ev.logger).Log("msg", "runtime panic in parser", "err", e, "stacktrace", string(buf))
|
|
*errp = errors.Wrap(err, "unexpected error")
|
|
case errWithWarnings:
|
|
*errp = err.err
|
|
*ws = append(*ws, err.warnings...)
|
|
default:
|
|
*errp = e.(error)
|
|
}
|
|
}
|
|
|
|
func (ev *evaluator) Eval(expr parser.Expr) (v parser.Value, ws storage.Warnings, err error) {
|
|
defer ev.recover(&ws, &err)
|
|
|
|
v, ws = ev.eval(expr)
|
|
return v, ws, nil
|
|
}
|
|
|
|
// EvalSeriesHelper stores extra information about a series.
|
|
type EvalSeriesHelper struct {
|
|
// The grouping key used by aggregation.
|
|
groupingKey uint64
|
|
// Used to map left-hand to right-hand in binary operations.
|
|
signature string
|
|
}
|
|
|
|
// EvalNodeHelper stores extra information and caches for evaluating a single node across steps.
|
|
type EvalNodeHelper struct {
|
|
// Evaluation timestamp.
|
|
Ts int64
|
|
// Vector that can be used for output.
|
|
Out Vector
|
|
|
|
// Caches.
|
|
// DropMetricName and label_*.
|
|
Dmn map[uint64]labels.Labels
|
|
// funcHistogramQuantile.
|
|
signatureToMetricWithBuckets map[string]*metricWithBuckets
|
|
// label_replace.
|
|
regex *regexp.Regexp
|
|
|
|
lb *labels.Builder
|
|
lblBuf []byte
|
|
lblResultBuf []byte
|
|
|
|
// For binary vector matching.
|
|
rightSigs map[string]Sample
|
|
matchedSigs map[string]map[uint64]struct{}
|
|
resultMetric map[string]labels.Labels
|
|
}
|
|
|
|
// DropMetricName is a cached version of DropMetricName.
|
|
func (enh *EvalNodeHelper) DropMetricName(l labels.Labels) labels.Labels {
|
|
if enh.Dmn == nil {
|
|
enh.Dmn = make(map[uint64]labels.Labels, len(enh.Out))
|
|
}
|
|
h := l.Hash()
|
|
ret, ok := enh.Dmn[h]
|
|
if ok {
|
|
return ret
|
|
}
|
|
ret = dropMetricName(l)
|
|
enh.Dmn[h] = ret
|
|
return ret
|
|
}
|
|
|
|
// rangeEval evaluates the given expressions, and then for each step calls
|
|
// the given funcCall with the values computed for each expression at that
|
|
// step. The return value is the combination into time series of all the
|
|
// function call results.
|
|
// The prepSeries function (if provided) can be used to prepare the helper
|
|
// for each series, then passed to each call funcCall.
|
|
func (ev *evaluator) rangeEval(prepSeries func(labels.Labels, *EvalSeriesHelper), funcCall func([]parser.Value, [][]EvalSeriesHelper, *EvalNodeHelper) (Vector, storage.Warnings), exprs ...parser.Expr) (Matrix, storage.Warnings) {
|
|
numSteps := int((ev.endTimestamp-ev.startTimestamp)/ev.interval) + 1
|
|
matrixes := make([]Matrix, len(exprs))
|
|
origMatrixes := make([]Matrix, len(exprs))
|
|
originalNumSamples := ev.currentSamples
|
|
|
|
var warnings storage.Warnings
|
|
for i, e := range exprs {
|
|
// Functions will take string arguments from the expressions, not the values.
|
|
if e != nil && e.Type() != parser.ValueTypeString {
|
|
// ev.currentSamples will be updated to the correct value within the ev.eval call.
|
|
val, ws := ev.eval(e)
|
|
warnings = append(warnings, ws...)
|
|
matrixes[i] = val.(Matrix)
|
|
|
|
// Keep a copy of the original point slices so that they
|
|
// can be returned to the pool.
|
|
origMatrixes[i] = make(Matrix, len(matrixes[i]))
|
|
copy(origMatrixes[i], matrixes[i])
|
|
}
|
|
}
|
|
|
|
vectors := make([]Vector, len(exprs)) // Input vectors for the function.
|
|
args := make([]parser.Value, len(exprs)) // Argument to function.
|
|
// Create an output vector that is as big as the input matrix with
|
|
// the most time series.
|
|
biggestLen := 1
|
|
for i := range exprs {
|
|
vectors[i] = make(Vector, 0, len(matrixes[i]))
|
|
if len(matrixes[i]) > biggestLen {
|
|
biggestLen = len(matrixes[i])
|
|
}
|
|
}
|
|
enh := &EvalNodeHelper{Out: make(Vector, 0, biggestLen)}
|
|
seriess := make(map[uint64]Series, biggestLen) // Output series by series hash.
|
|
tempNumSamples := ev.currentSamples
|
|
|
|
var (
|
|
seriesHelpers [][]EvalSeriesHelper
|
|
bufHelpers [][]EvalSeriesHelper // Buffer updated on each step
|
|
)
|
|
|
|
// If the series preparation function is provided, we should run it for
|
|
// every single series in the matrix.
|
|
if prepSeries != nil {
|
|
seriesHelpers = make([][]EvalSeriesHelper, len(exprs))
|
|
bufHelpers = make([][]EvalSeriesHelper, len(exprs))
|
|
|
|
for i := range exprs {
|
|
seriesHelpers[i] = make([]EvalSeriesHelper, len(matrixes[i]))
|
|
bufHelpers[i] = make([]EvalSeriesHelper, len(matrixes[i]))
|
|
|
|
for si, series := range matrixes[i] {
|
|
h := seriesHelpers[i][si]
|
|
prepSeries(series.Metric, &h)
|
|
seriesHelpers[i][si] = h
|
|
}
|
|
}
|
|
}
|
|
|
|
for ts := ev.startTimestamp; ts <= ev.endTimestamp; ts += ev.interval {
|
|
if err := contextDone(ev.ctx, "expression evaluation"); err != nil {
|
|
ev.error(err)
|
|
}
|
|
// Reset number of samples in memory after each timestamp.
|
|
ev.currentSamples = tempNumSamples
|
|
// Gather input vectors for this timestamp.
|
|
for i := range exprs {
|
|
vectors[i] = vectors[i][:0]
|
|
|
|
if prepSeries != nil {
|
|
bufHelpers[i] = bufHelpers[i][:0]
|
|
}
|
|
|
|
for si, series := range matrixes[i] {
|
|
for _, point := range series.Points {
|
|
if point.T == ts {
|
|
if ev.currentSamples < ev.maxSamples {
|
|
vectors[i] = append(vectors[i], Sample{Metric: series.Metric, Point: point})
|
|
if prepSeries != nil {
|
|
bufHelpers[i] = append(bufHelpers[i], seriesHelpers[i][si])
|
|
}
|
|
|
|
// Move input vectors forward so we don't have to re-scan the same
|
|
// past points at the next step.
|
|
matrixes[i][si].Points = series.Points[1:]
|
|
ev.currentSamples++
|
|
} else {
|
|
ev.error(ErrTooManySamples(env))
|
|
}
|
|
}
|
|
break
|
|
}
|
|
}
|
|
args[i] = vectors[i]
|
|
}
|
|
|
|
// Make the function call.
|
|
enh.Ts = ts
|
|
result, ws := funcCall(args, bufHelpers, enh)
|
|
if result.ContainsSameLabelset() {
|
|
ev.errorf("vector cannot contain metrics with the same labelset")
|
|
}
|
|
enh.Out = result[:0] // Reuse result vector.
|
|
warnings = append(warnings, ws...)
|
|
|
|
ev.currentSamples += len(result)
|
|
// When we reset currentSamples to tempNumSamples during the next iteration of the loop it also
|
|
// needs to include the samples from the result here, as they're still in memory.
|
|
tempNumSamples += len(result)
|
|
|
|
if ev.currentSamples > ev.maxSamples {
|
|
ev.error(ErrTooManySamples(env))
|
|
}
|
|
|
|
// If this could be an instant query, shortcut so as not to change sort order.
|
|
if ev.endTimestamp == ev.startTimestamp {
|
|
mat := make(Matrix, len(result))
|
|
for i, s := range result {
|
|
s.Point.T = ts
|
|
mat[i] = Series{Metric: s.Metric, Points: []Point{s.Point}}
|
|
}
|
|
ev.currentSamples = originalNumSamples + mat.TotalSamples()
|
|
return mat, warnings
|
|
}
|
|
|
|
// Add samples in output vector to output series.
|
|
for _, sample := range result {
|
|
h := sample.Metric.Hash()
|
|
ss, ok := seriess[h]
|
|
if !ok {
|
|
ss = Series{
|
|
Metric: sample.Metric,
|
|
Points: getPointSlice(numSteps),
|
|
}
|
|
}
|
|
sample.Point.T = ts
|
|
ss.Points = append(ss.Points, sample.Point)
|
|
seriess[h] = ss
|
|
|
|
}
|
|
}
|
|
|
|
// Reuse the original point slices.
|
|
for _, m := range origMatrixes {
|
|
for _, s := range m {
|
|
putPointSlice(s.Points)
|
|
}
|
|
}
|
|
// Assemble the output matrix. By the time we get here we know we don't have too many samples.
|
|
mat := make(Matrix, 0, len(seriess))
|
|
for _, ss := range seriess {
|
|
mat = append(mat, ss)
|
|
}
|
|
ev.currentSamples = originalNumSamples + mat.TotalSamples()
|
|
return mat, warnings
|
|
}
|
|
|
|
// evalSubquery evaluates given SubqueryExpr and returns an equivalent
|
|
// evaluated MatrixSelector in its place. Note that the Name and LabelMatchers are not set.
|
|
func (ev *evaluator) evalSubquery(subq *parser.SubqueryExpr) (*parser.MatrixSelector, int, storage.Warnings) {
|
|
val, ws := ev.eval(subq)
|
|
mat := val.(Matrix)
|
|
vs := &parser.VectorSelector{
|
|
OriginalOffset: subq.OriginalOffset,
|
|
Offset: subq.Offset,
|
|
Series: make([]storage.Series, 0, len(mat)),
|
|
Timestamp: subq.Timestamp,
|
|
}
|
|
if subq.Timestamp != nil {
|
|
// The offset of subquery is not modified in case of @ modifier.
|
|
// Hence we take care of that here for the result.
|
|
vs.Offset = subq.OriginalOffset + time.Duration(ev.startTimestamp-*subq.Timestamp)*time.Millisecond
|
|
}
|
|
ms := &parser.MatrixSelector{
|
|
Range: subq.Range,
|
|
VectorSelector: vs,
|
|
}
|
|
totalSamples := 0
|
|
for _, s := range mat {
|
|
totalSamples += len(s.Points)
|
|
vs.Series = append(vs.Series, NewStorageSeries(s))
|
|
}
|
|
return ms, totalSamples, ws
|
|
}
|
|
|
|
// eval evaluates the given expression as the given AST expression node requires.
|
|
func (ev *evaluator) eval(expr parser.Expr) (parser.Value, storage.Warnings) {
|
|
// This is the top-level evaluation method.
|
|
// Thus, we check for timeout/cancellation here.
|
|
if err := contextDone(ev.ctx, "expression evaluation"); err != nil {
|
|
ev.error(err)
|
|
}
|
|
numSteps := int((ev.endTimestamp-ev.startTimestamp)/ev.interval) + 1
|
|
|
|
// Create a new span to help investigate inner evaluation performances.
|
|
ctxWithSpan, span := otel.Tracer("").Start(ev.ctx, stats.InnerEvalTime.SpanOperation()+" eval "+reflect.TypeOf(expr).String())
|
|
ev.ctx = ctxWithSpan
|
|
defer span.End()
|
|
|
|
switch e := expr.(type) {
|
|
case *parser.AggregateExpr:
|
|
// Grouping labels must be sorted (expected both by generateGroupingKey() and aggregation()).
|
|
sortedGrouping := e.Grouping
|
|
sort.Strings(sortedGrouping)
|
|
|
|
// Prepare a function to initialise series helpers with the grouping key.
|
|
buf := make([]byte, 0, 1024)
|
|
initSeries := func(series labels.Labels, h *EvalSeriesHelper) {
|
|
h.groupingKey, buf = generateGroupingKey(series, sortedGrouping, e.Without, buf)
|
|
}
|
|
|
|
unwrapParenExpr(&e.Param)
|
|
param := unwrapStepInvariantExpr(e.Param)
|
|
unwrapParenExpr(¶m)
|
|
if s, ok := param.(*parser.StringLiteral); ok {
|
|
return ev.rangeEval(initSeries, func(v []parser.Value, sh [][]EvalSeriesHelper, enh *EvalNodeHelper) (Vector, storage.Warnings) {
|
|
return ev.aggregation(e.Op, sortedGrouping, e.Without, s.Val, v[0].(Vector), sh[0], enh), nil
|
|
}, e.Expr)
|
|
}
|
|
|
|
return ev.rangeEval(initSeries, func(v []parser.Value, sh [][]EvalSeriesHelper, enh *EvalNodeHelper) (Vector, storage.Warnings) {
|
|
var param float64
|
|
if e.Param != nil {
|
|
param = v[0].(Vector)[0].V
|
|
}
|
|
return ev.aggregation(e.Op, sortedGrouping, e.Without, param, v[1].(Vector), sh[1], enh), nil
|
|
}, e.Param, e.Expr)
|
|
|
|
case *parser.Call:
|
|
call := FunctionCalls[e.Func.Name]
|
|
if e.Func.Name == "timestamp" {
|
|
// Matrix evaluation always returns the evaluation time,
|
|
// so this function needs special handling when given
|
|
// a vector selector.
|
|
unwrapParenExpr(&e.Args[0])
|
|
arg := unwrapStepInvariantExpr(e.Args[0])
|
|
unwrapParenExpr(&arg)
|
|
vs, ok := arg.(*parser.VectorSelector)
|
|
if ok {
|
|
return ev.rangeEval(nil, func(v []parser.Value, _ [][]EvalSeriesHelper, enh *EvalNodeHelper) (Vector, storage.Warnings) {
|
|
if vs.Timestamp != nil {
|
|
// This is a special case only for "timestamp" since the offset
|
|
// needs to be adjusted for every point.
|
|
vs.Offset = time.Duration(enh.Ts-*vs.Timestamp) * time.Millisecond
|
|
}
|
|
val, ws := ev.vectorSelector(vs, enh.Ts)
|
|
return call([]parser.Value{val}, e.Args, enh), ws
|
|
})
|
|
}
|
|
}
|
|
|
|
// Check if the function has a matrix argument.
|
|
var (
|
|
matrixArgIndex int
|
|
matrixArg bool
|
|
warnings storage.Warnings
|
|
)
|
|
for i := range e.Args {
|
|
unwrapParenExpr(&e.Args[i])
|
|
a := unwrapStepInvariantExpr(e.Args[i])
|
|
unwrapParenExpr(&a)
|
|
if _, ok := a.(*parser.MatrixSelector); ok {
|
|
matrixArgIndex = i
|
|
matrixArg = true
|
|
break
|
|
}
|
|
// parser.SubqueryExpr can be used in place of parser.MatrixSelector.
|
|
if subq, ok := a.(*parser.SubqueryExpr); ok {
|
|
matrixArgIndex = i
|
|
matrixArg = true
|
|
// Replacing parser.SubqueryExpr with parser.MatrixSelector.
|
|
val, totalSamples, ws := ev.evalSubquery(subq)
|
|
e.Args[i] = val
|
|
warnings = append(warnings, ws...)
|
|
defer func() {
|
|
// subquery result takes space in the memory. Get rid of that at the end.
|
|
val.VectorSelector.(*parser.VectorSelector).Series = nil
|
|
ev.currentSamples -= totalSamples
|
|
}()
|
|
break
|
|
}
|
|
}
|
|
if !matrixArg {
|
|
// Does not have a matrix argument.
|
|
return ev.rangeEval(nil, func(v []parser.Value, _ [][]EvalSeriesHelper, enh *EvalNodeHelper) (Vector, storage.Warnings) {
|
|
return call(v, e.Args, enh), warnings
|
|
}, e.Args...)
|
|
}
|
|
|
|
inArgs := make([]parser.Value, len(e.Args))
|
|
// Evaluate any non-matrix arguments.
|
|
otherArgs := make([]Matrix, len(e.Args))
|
|
otherInArgs := make([]Vector, len(e.Args))
|
|
for i, e := range e.Args {
|
|
if i != matrixArgIndex {
|
|
val, ws := ev.eval(e)
|
|
otherArgs[i] = val.(Matrix)
|
|
otherInArgs[i] = Vector{Sample{}}
|
|
inArgs[i] = otherInArgs[i]
|
|
warnings = append(warnings, ws...)
|
|
}
|
|
}
|
|
|
|
unwrapParenExpr(&e.Args[matrixArgIndex])
|
|
arg := unwrapStepInvariantExpr(e.Args[matrixArgIndex])
|
|
unwrapParenExpr(&arg)
|
|
sel := arg.(*parser.MatrixSelector)
|
|
selVS := sel.VectorSelector.(*parser.VectorSelector)
|
|
|
|
ws, err := checkAndExpandSeriesSet(ev.ctx, sel)
|
|
warnings = append(warnings, ws...)
|
|
if err != nil {
|
|
ev.error(errWithWarnings{errors.Wrap(err, "expanding series"), warnings})
|
|
}
|
|
mat := make(Matrix, 0, len(selVS.Series)) // Output matrix.
|
|
offset := durationMilliseconds(selVS.Offset)
|
|
selRange := durationMilliseconds(sel.Range)
|
|
stepRange := selRange
|
|
if stepRange > ev.interval {
|
|
stepRange = ev.interval
|
|
}
|
|
// Reuse objects across steps to save memory allocations.
|
|
points := getPointSlice(16)
|
|
inMatrix := make(Matrix, 1)
|
|
inArgs[matrixArgIndex] = inMatrix
|
|
enh := &EvalNodeHelper{Out: make(Vector, 0, 1)}
|
|
// Process all the calls for one time series at a time.
|
|
it := storage.NewBuffer(selRange)
|
|
for i, s := range selVS.Series {
|
|
ev.currentSamples -= len(points)
|
|
points = points[:0]
|
|
it.Reset(s.Iterator())
|
|
metric := selVS.Series[i].Labels()
|
|
// The last_over_time function acts like offset; thus, it
|
|
// should keep the metric name. For all the other range
|
|
// vector functions, the only change needed is to drop the
|
|
// metric name in the output.
|
|
if e.Func.Name != "last_over_time" {
|
|
metric = dropMetricName(metric)
|
|
}
|
|
ss := Series{
|
|
Metric: metric,
|
|
Points: getPointSlice(numSteps),
|
|
}
|
|
inMatrix[0].Metric = selVS.Series[i].Labels()
|
|
for ts, step := ev.startTimestamp, -1; ts <= ev.endTimestamp; ts += ev.interval {
|
|
step++
|
|
// Set the non-matrix arguments.
|
|
// They are scalar, so it is safe to use the step number
|
|
// when looking up the argument, as there will be no gaps.
|
|
for j := range e.Args {
|
|
if j != matrixArgIndex {
|
|
otherInArgs[j][0].V = otherArgs[j][0].Points[step].V
|
|
}
|
|
}
|
|
maxt := ts - offset
|
|
mint := maxt - selRange
|
|
// Evaluate the matrix selector for this series for this step.
|
|
points = ev.matrixIterSlice(it, mint, maxt, points)
|
|
if len(points) == 0 {
|
|
continue
|
|
}
|
|
inMatrix[0].Points = points
|
|
enh.Ts = ts
|
|
// Make the function call.
|
|
outVec := call(inArgs, e.Args, enh)
|
|
enh.Out = outVec[:0]
|
|
if len(outVec) > 0 {
|
|
ss.Points = append(ss.Points, Point{V: outVec[0].Point.V, T: ts})
|
|
}
|
|
// Only buffer stepRange milliseconds from the second step on.
|
|
it.ReduceDelta(stepRange)
|
|
}
|
|
if len(ss.Points) > 0 {
|
|
if ev.currentSamples+len(ss.Points) <= ev.maxSamples {
|
|
mat = append(mat, ss)
|
|
ev.currentSamples += len(ss.Points)
|
|
} else {
|
|
ev.error(ErrTooManySamples(env))
|
|
}
|
|
} else {
|
|
putPointSlice(ss.Points)
|
|
}
|
|
}
|
|
|
|
ev.currentSamples -= len(points)
|
|
putPointSlice(points)
|
|
|
|
// The absent_over_time function returns 0 or 1 series. So far, the matrix
|
|
// contains multiple series. The following code will create a new series
|
|
// with values of 1 for the timestamps where no series has value.
|
|
if e.Func.Name == "absent_over_time" {
|
|
steps := int(1 + (ev.endTimestamp-ev.startTimestamp)/ev.interval)
|
|
// Iterate once to look for a complete series.
|
|
for _, s := range mat {
|
|
if len(s.Points) == steps {
|
|
return Matrix{}, warnings
|
|
}
|
|
}
|
|
|
|
found := map[int64]struct{}{}
|
|
|
|
for i, s := range mat {
|
|
for _, p := range s.Points {
|
|
found[p.T] = struct{}{}
|
|
}
|
|
if i > 0 && len(found) == steps {
|
|
return Matrix{}, warnings
|
|
}
|
|
}
|
|
|
|
newp := make([]Point, 0, steps-len(found))
|
|
for ts := ev.startTimestamp; ts <= ev.endTimestamp; ts += ev.interval {
|
|
if _, ok := found[ts]; !ok {
|
|
newp = append(newp, Point{T: ts, V: 1})
|
|
}
|
|
}
|
|
|
|
return Matrix{
|
|
Series{
|
|
Metric: createLabelsForAbsentFunction(e.Args[0]),
|
|
Points: newp,
|
|
},
|
|
}, warnings
|
|
}
|
|
|
|
if mat.ContainsSameLabelset() {
|
|
ev.errorf("vector cannot contain metrics with the same labelset")
|
|
}
|
|
|
|
return mat, warnings
|
|
|
|
case *parser.ParenExpr:
|
|
return ev.eval(e.Expr)
|
|
|
|
case *parser.UnaryExpr:
|
|
val, ws := ev.eval(e.Expr)
|
|
mat := val.(Matrix)
|
|
if e.Op == parser.SUB {
|
|
for i := range mat {
|
|
mat[i].Metric = dropMetricName(mat[i].Metric)
|
|
for j := range mat[i].Points {
|
|
mat[i].Points[j].V = -mat[i].Points[j].V
|
|
}
|
|
}
|
|
if mat.ContainsSameLabelset() {
|
|
ev.errorf("vector cannot contain metrics with the same labelset")
|
|
}
|
|
}
|
|
return mat, ws
|
|
|
|
case *parser.BinaryExpr:
|
|
switch lt, rt := e.LHS.Type(), e.RHS.Type(); {
|
|
case lt == parser.ValueTypeScalar && rt == parser.ValueTypeScalar:
|
|
return ev.rangeEval(nil, func(v []parser.Value, _ [][]EvalSeriesHelper, enh *EvalNodeHelper) (Vector, storage.Warnings) {
|
|
val := scalarBinop(e.Op, v[0].(Vector)[0].Point.V, v[1].(Vector)[0].Point.V)
|
|
return append(enh.Out, Sample{Point: Point{V: val}}), nil
|
|
}, e.LHS, e.RHS)
|
|
case lt == parser.ValueTypeVector && rt == parser.ValueTypeVector:
|
|
// Function to compute the join signature for each series.
|
|
buf := make([]byte, 0, 1024)
|
|
sigf := signatureFunc(e.VectorMatching.On, buf, e.VectorMatching.MatchingLabels...)
|
|
initSignatures := func(series labels.Labels, h *EvalSeriesHelper) {
|
|
h.signature = sigf(series)
|
|
}
|
|
switch e.Op {
|
|
case parser.LAND:
|
|
return ev.rangeEval(initSignatures, func(v []parser.Value, sh [][]EvalSeriesHelper, enh *EvalNodeHelper) (Vector, storage.Warnings) {
|
|
return ev.VectorAnd(v[0].(Vector), v[1].(Vector), e.VectorMatching, sh[0], sh[1], enh), nil
|
|
}, e.LHS, e.RHS)
|
|
case parser.LOR:
|
|
return ev.rangeEval(initSignatures, func(v []parser.Value, sh [][]EvalSeriesHelper, enh *EvalNodeHelper) (Vector, storage.Warnings) {
|
|
return ev.VectorOr(v[0].(Vector), v[1].(Vector), e.VectorMatching, sh[0], sh[1], enh), nil
|
|
}, e.LHS, e.RHS)
|
|
case parser.LUNLESS:
|
|
return ev.rangeEval(initSignatures, func(v []parser.Value, sh [][]EvalSeriesHelper, enh *EvalNodeHelper) (Vector, storage.Warnings) {
|
|
return ev.VectorUnless(v[0].(Vector), v[1].(Vector), e.VectorMatching, sh[0], sh[1], enh), nil
|
|
}, e.LHS, e.RHS)
|
|
default:
|
|
return ev.rangeEval(initSignatures, func(v []parser.Value, sh [][]EvalSeriesHelper, enh *EvalNodeHelper) (Vector, storage.Warnings) {
|
|
return ev.VectorBinop(e.Op, v[0].(Vector), v[1].(Vector), e.VectorMatching, e.ReturnBool, sh[0], sh[1], enh), nil
|
|
}, e.LHS, e.RHS)
|
|
}
|
|
|
|
case lt == parser.ValueTypeVector && rt == parser.ValueTypeScalar:
|
|
return ev.rangeEval(nil, func(v []parser.Value, _ [][]EvalSeriesHelper, enh *EvalNodeHelper) (Vector, storage.Warnings) {
|
|
return ev.VectorscalarBinop(e.Op, v[0].(Vector), Scalar{V: v[1].(Vector)[0].Point.V}, false, e.ReturnBool, enh), nil
|
|
}, e.LHS, e.RHS)
|
|
|
|
case lt == parser.ValueTypeScalar && rt == parser.ValueTypeVector:
|
|
return ev.rangeEval(nil, func(v []parser.Value, _ [][]EvalSeriesHelper, enh *EvalNodeHelper) (Vector, storage.Warnings) {
|
|
return ev.VectorscalarBinop(e.Op, v[1].(Vector), Scalar{V: v[0].(Vector)[0].Point.V}, true, e.ReturnBool, enh), nil
|
|
}, e.LHS, e.RHS)
|
|
}
|
|
|
|
case *parser.NumberLiteral:
|
|
return ev.rangeEval(nil, func(v []parser.Value, _ [][]EvalSeriesHelper, enh *EvalNodeHelper) (Vector, storage.Warnings) {
|
|
return append(enh.Out, Sample{Point: Point{V: e.Val}}), nil
|
|
})
|
|
|
|
case *parser.StringLiteral:
|
|
return String{V: e.Val, T: ev.startTimestamp}, nil
|
|
|
|
case *parser.VectorSelector:
|
|
ws, err := checkAndExpandSeriesSet(ev.ctx, e)
|
|
if err != nil {
|
|
ev.error(errWithWarnings{errors.Wrap(err, "expanding series"), ws})
|
|
}
|
|
mat := make(Matrix, 0, len(e.Series))
|
|
it := storage.NewMemoizedEmptyIterator(durationMilliseconds(ev.lookbackDelta))
|
|
for i, s := range e.Series {
|
|
it.Reset(s.Iterator())
|
|
ss := Series{
|
|
Metric: e.Series[i].Labels(),
|
|
Points: getPointSlice(numSteps),
|
|
}
|
|
|
|
for ts := ev.startTimestamp; ts <= ev.endTimestamp; ts += ev.interval {
|
|
_, v, ok := ev.vectorSelectorSingle(it, e, ts)
|
|
if ok {
|
|
if ev.currentSamples < ev.maxSamples {
|
|
ss.Points = append(ss.Points, Point{V: v, T: ts})
|
|
ev.currentSamples++
|
|
} else {
|
|
ev.error(ErrTooManySamples(env))
|
|
}
|
|
}
|
|
}
|
|
|
|
if len(ss.Points) > 0 {
|
|
mat = append(mat, ss)
|
|
} else {
|
|
putPointSlice(ss.Points)
|
|
}
|
|
}
|
|
return mat, ws
|
|
|
|
case *parser.MatrixSelector:
|
|
if ev.startTimestamp != ev.endTimestamp {
|
|
panic(errors.New("cannot do range evaluation of matrix selector"))
|
|
}
|
|
return ev.matrixSelector(e)
|
|
|
|
case *parser.SubqueryExpr:
|
|
offsetMillis := durationMilliseconds(e.Offset)
|
|
rangeMillis := durationMilliseconds(e.Range)
|
|
newEv := &evaluator{
|
|
endTimestamp: ev.endTimestamp - offsetMillis,
|
|
ctx: ev.ctx,
|
|
currentSamples: ev.currentSamples,
|
|
maxSamples: ev.maxSamples,
|
|
logger: ev.logger,
|
|
lookbackDelta: ev.lookbackDelta,
|
|
noStepSubqueryIntervalFn: ev.noStepSubqueryIntervalFn,
|
|
}
|
|
|
|
if e.Step != 0 {
|
|
newEv.interval = durationMilliseconds(e.Step)
|
|
} else {
|
|
newEv.interval = ev.noStepSubqueryIntervalFn(rangeMillis)
|
|
}
|
|
|
|
// Start with the first timestamp after (ev.startTimestamp - offset - range)
|
|
// that is aligned with the step (multiple of 'newEv.interval').
|
|
newEv.startTimestamp = newEv.interval * ((ev.startTimestamp - offsetMillis - rangeMillis) / newEv.interval)
|
|
if newEv.startTimestamp < (ev.startTimestamp - offsetMillis - rangeMillis) {
|
|
newEv.startTimestamp += newEv.interval
|
|
}
|
|
|
|
if newEv.startTimestamp != ev.startTimestamp {
|
|
// Adjust the offset of selectors based on the new
|
|
// start time of the evaluator since the calculation
|
|
// of the offset with @ happens w.r.t. the start time.
|
|
setOffsetForAtModifier(newEv.startTimestamp, e.Expr)
|
|
}
|
|
|
|
res, ws := newEv.eval(e.Expr)
|
|
ev.currentSamples = newEv.currentSamples
|
|
return res, ws
|
|
case *parser.StepInvariantExpr:
|
|
switch ce := e.Expr.(type) {
|
|
case *parser.StringLiteral, *parser.NumberLiteral:
|
|
return ev.eval(ce)
|
|
}
|
|
|
|
newEv := &evaluator{
|
|
startTimestamp: ev.startTimestamp,
|
|
endTimestamp: ev.startTimestamp, // Always a single evaluation.
|
|
interval: ev.interval,
|
|
ctx: ev.ctx,
|
|
currentSamples: ev.currentSamples,
|
|
maxSamples: ev.maxSamples,
|
|
logger: ev.logger,
|
|
lookbackDelta: ev.lookbackDelta,
|
|
noStepSubqueryIntervalFn: ev.noStepSubqueryIntervalFn,
|
|
}
|
|
res, ws := newEv.eval(e.Expr)
|
|
ev.currentSamples = newEv.currentSamples
|
|
switch e.Expr.(type) {
|
|
case *parser.MatrixSelector, *parser.SubqueryExpr:
|
|
// We do not duplicate results for range selectors since result is a matrix
|
|
// with their unique timestamps which does not depend on the step.
|
|
return res, ws
|
|
}
|
|
|
|
// For every evaluation while the value remains same, the timestamp for that
|
|
// value would change for different eval times. Hence we duplicate the result
|
|
// with changed timestamps.
|
|
mat, ok := res.(Matrix)
|
|
if !ok {
|
|
panic(errors.Errorf("unexpected result in StepInvariantExpr evaluation: %T", expr))
|
|
}
|
|
for i := range mat {
|
|
if len(mat[i].Points) != 1 {
|
|
panic(errors.Errorf("unexpected number of samples"))
|
|
}
|
|
for ts := ev.startTimestamp + ev.interval; ts <= ev.endTimestamp; ts = ts + ev.interval {
|
|
mat[i].Points = append(mat[i].Points, Point{
|
|
T: ts,
|
|
V: mat[i].Points[0].V,
|
|
})
|
|
ev.currentSamples++
|
|
if ev.currentSamples > ev.maxSamples {
|
|
ev.error(ErrTooManySamples(env))
|
|
}
|
|
}
|
|
}
|
|
return res, ws
|
|
}
|
|
|
|
panic(errors.Errorf("unhandled expression of type: %T", expr))
|
|
}
|
|
|
|
// vectorSelector evaluates a *parser.VectorSelector expression.
|
|
func (ev *evaluator) vectorSelector(node *parser.VectorSelector, ts int64) (Vector, storage.Warnings) {
|
|
ws, err := checkAndExpandSeriesSet(ev.ctx, node)
|
|
if err != nil {
|
|
ev.error(errWithWarnings{errors.Wrap(err, "expanding series"), ws})
|
|
}
|
|
vec := make(Vector, 0, len(node.Series))
|
|
it := storage.NewMemoizedEmptyIterator(durationMilliseconds(ev.lookbackDelta))
|
|
for i, s := range node.Series {
|
|
it.Reset(s.Iterator())
|
|
|
|
t, v, ok := ev.vectorSelectorSingle(it, node, ts)
|
|
if ok {
|
|
vec = append(vec, Sample{
|
|
Metric: node.Series[i].Labels(),
|
|
Point: Point{V: v, T: t},
|
|
})
|
|
|
|
ev.currentSamples++
|
|
if ev.currentSamples > ev.maxSamples {
|
|
ev.error(ErrTooManySamples(env))
|
|
}
|
|
}
|
|
|
|
}
|
|
return vec, ws
|
|
}
|
|
|
|
// vectorSelectorSingle evaluates a instant vector for the iterator of one time series.
|
|
func (ev *evaluator) vectorSelectorSingle(it *storage.MemoizedSeriesIterator, node *parser.VectorSelector, ts int64) (int64, float64, bool) {
|
|
refTime := ts - durationMilliseconds(node.Offset)
|
|
var t int64
|
|
var v float64
|
|
|
|
ok := it.Seek(refTime)
|
|
if !ok {
|
|
if it.Err() != nil {
|
|
ev.error(it.Err())
|
|
}
|
|
}
|
|
|
|
if ok {
|
|
t, v = it.At()
|
|
}
|
|
|
|
if !ok || t > refTime {
|
|
t, v, ok = it.PeekPrev()
|
|
if !ok || t < refTime-durationMilliseconds(ev.lookbackDelta) {
|
|
return 0, 0, false
|
|
}
|
|
}
|
|
if value.IsStaleNaN(v) {
|
|
return 0, 0, false
|
|
}
|
|
return t, v, true
|
|
}
|
|
|
|
var pointPool = sync.Pool{}
|
|
|
|
func getPointSlice(sz int) []Point {
|
|
p := pointPool.Get()
|
|
if p != nil {
|
|
return p.([]Point)
|
|
}
|
|
return make([]Point, 0, sz)
|
|
}
|
|
|
|
func putPointSlice(p []Point) {
|
|
//nolint:staticcheck // Ignore SA6002 relax staticcheck verification.
|
|
pointPool.Put(p[:0])
|
|
}
|
|
|
|
// matrixSelector evaluates a *parser.MatrixSelector expression.
|
|
func (ev *evaluator) matrixSelector(node *parser.MatrixSelector) (Matrix, storage.Warnings) {
|
|
var (
|
|
vs = node.VectorSelector.(*parser.VectorSelector)
|
|
|
|
offset = durationMilliseconds(vs.Offset)
|
|
maxt = ev.startTimestamp - offset
|
|
mint = maxt - durationMilliseconds(node.Range)
|
|
matrix = make(Matrix, 0, len(vs.Series))
|
|
|
|
it = storage.NewBuffer(durationMilliseconds(node.Range))
|
|
)
|
|
ws, err := checkAndExpandSeriesSet(ev.ctx, node)
|
|
if err != nil {
|
|
ev.error(errWithWarnings{errors.Wrap(err, "expanding series"), ws})
|
|
}
|
|
|
|
series := vs.Series
|
|
for i, s := range series {
|
|
if err := contextDone(ev.ctx, "expression evaluation"); err != nil {
|
|
ev.error(err)
|
|
}
|
|
it.Reset(s.Iterator())
|
|
ss := Series{
|
|
Metric: series[i].Labels(),
|
|
}
|
|
|
|
ss.Points = ev.matrixIterSlice(it, mint, maxt, getPointSlice(16))
|
|
|
|
if len(ss.Points) > 0 {
|
|
matrix = append(matrix, ss)
|
|
} else {
|
|
putPointSlice(ss.Points)
|
|
}
|
|
}
|
|
return matrix, ws
|
|
}
|
|
|
|
// matrixIterSlice populates a matrix vector covering the requested range for a
|
|
// single time series, with points retrieved from an iterator.
|
|
//
|
|
// As an optimization, the matrix vector may already contain points of the same
|
|
// time series from the evaluation of an earlier step (with lower mint and maxt
|
|
// values). Any such points falling before mint are discarded; points that fall
|
|
// into the [mint, maxt] range are retained; only points with later timestamps
|
|
// are populated from the iterator.
|
|
func (ev *evaluator) matrixIterSlice(it *storage.BufferedSeriesIterator, mint, maxt int64, out []Point) []Point {
|
|
if len(out) > 0 && out[len(out)-1].T >= mint {
|
|
// There is an overlap between previous and current ranges, retain common
|
|
// points. In most such cases:
|
|
// (a) the overlap is significantly larger than the eval step; and/or
|
|
// (b) the number of samples is relatively small.
|
|
// so a linear search will be as fast as a binary search.
|
|
var drop int
|
|
for drop = 0; out[drop].T < mint; drop++ {
|
|
}
|
|
ev.currentSamples -= drop
|
|
copy(out, out[drop:])
|
|
out = out[:len(out)-drop]
|
|
// Only append points with timestamps after the last timestamp we have.
|
|
mint = out[len(out)-1].T + 1
|
|
} else {
|
|
ev.currentSamples -= len(out)
|
|
out = out[:0]
|
|
}
|
|
|
|
ok := it.Seek(maxt)
|
|
if !ok {
|
|
if it.Err() != nil {
|
|
ev.error(it.Err())
|
|
}
|
|
}
|
|
|
|
buf := it.Buffer()
|
|
for buf.Next() {
|
|
t, v := buf.At()
|
|
if value.IsStaleNaN(v) {
|
|
continue
|
|
}
|
|
// Values in the buffer are guaranteed to be smaller than maxt.
|
|
if t >= mint {
|
|
if ev.currentSamples >= ev.maxSamples {
|
|
ev.error(ErrTooManySamples(env))
|
|
}
|
|
ev.currentSamples++
|
|
out = append(out, Point{T: t, V: v})
|
|
}
|
|
}
|
|
// The seeked sample might also be in the range.
|
|
if ok {
|
|
t, v := it.At()
|
|
if t == maxt && !value.IsStaleNaN(v) {
|
|
if ev.currentSamples >= ev.maxSamples {
|
|
ev.error(ErrTooManySamples(env))
|
|
}
|
|
out = append(out, Point{T: t, V: v})
|
|
ev.currentSamples++
|
|
}
|
|
}
|
|
return out
|
|
}
|
|
|
|
func (ev *evaluator) VectorAnd(lhs, rhs Vector, matching *parser.VectorMatching, lhsh, rhsh []EvalSeriesHelper, enh *EvalNodeHelper) Vector {
|
|
if matching.Card != parser.CardManyToMany {
|
|
panic("set operations must only use many-to-many matching")
|
|
}
|
|
if len(lhs) == 0 || len(rhs) == 0 {
|
|
return nil // Short-circuit: AND with nothing is nothing.
|
|
}
|
|
|
|
// The set of signatures for the right-hand side Vector.
|
|
rightSigs := map[string]struct{}{}
|
|
// Add all rhs samples to a map so we can easily find matches later.
|
|
for _, sh := range rhsh {
|
|
rightSigs[sh.signature] = struct{}{}
|
|
}
|
|
|
|
for i, ls := range lhs {
|
|
// If there's a matching entry in the right-hand side Vector, add the sample.
|
|
if _, ok := rightSigs[lhsh[i].signature]; ok {
|
|
enh.Out = append(enh.Out, ls)
|
|
}
|
|
}
|
|
return enh.Out
|
|
}
|
|
|
|
func (ev *evaluator) VectorOr(lhs, rhs Vector, matching *parser.VectorMatching, lhsh, rhsh []EvalSeriesHelper, enh *EvalNodeHelper) Vector {
|
|
if matching.Card != parser.CardManyToMany {
|
|
panic("set operations must only use many-to-many matching")
|
|
}
|
|
if len(lhs) == 0 { // Short-circuit.
|
|
enh.Out = append(enh.Out, rhs...)
|
|
return enh.Out
|
|
} else if len(rhs) == 0 {
|
|
enh.Out = append(enh.Out, lhs...)
|
|
return enh.Out
|
|
}
|
|
|
|
leftSigs := map[string]struct{}{}
|
|
// Add everything from the left-hand-side Vector.
|
|
for i, ls := range lhs {
|
|
leftSigs[lhsh[i].signature] = struct{}{}
|
|
enh.Out = append(enh.Out, ls)
|
|
}
|
|
// Add all right-hand side elements which have not been added from the left-hand side.
|
|
for j, rs := range rhs {
|
|
if _, ok := leftSigs[rhsh[j].signature]; !ok {
|
|
enh.Out = append(enh.Out, rs)
|
|
}
|
|
}
|
|
return enh.Out
|
|
}
|
|
|
|
func (ev *evaluator) VectorUnless(lhs, rhs Vector, matching *parser.VectorMatching, lhsh, rhsh []EvalSeriesHelper, enh *EvalNodeHelper) Vector {
|
|
if matching.Card != parser.CardManyToMany {
|
|
panic("set operations must only use many-to-many matching")
|
|
}
|
|
// Short-circuit: empty rhs means we will return everything in lhs;
|
|
// empty lhs means we will return empty - don't need to build a map.
|
|
if len(lhs) == 0 || len(rhs) == 0 {
|
|
enh.Out = append(enh.Out, lhs...)
|
|
return enh.Out
|
|
}
|
|
|
|
rightSigs := map[string]struct{}{}
|
|
for _, sh := range rhsh {
|
|
rightSigs[sh.signature] = struct{}{}
|
|
}
|
|
|
|
for i, ls := range lhs {
|
|
if _, ok := rightSigs[lhsh[i].signature]; !ok {
|
|
enh.Out = append(enh.Out, ls)
|
|
}
|
|
}
|
|
return enh.Out
|
|
}
|
|
|
|
// VectorBinop evaluates a binary operation between two Vectors, excluding set operators.
|
|
func (ev *evaluator) VectorBinop(op parser.ItemType, lhs, rhs Vector, matching *parser.VectorMatching, returnBool bool, lhsh, rhsh []EvalSeriesHelper, enh *EvalNodeHelper) Vector {
|
|
if matching.Card == parser.CardManyToMany {
|
|
panic("many-to-many only allowed for set operators")
|
|
}
|
|
if len(lhs) == 0 || len(rhs) == 0 {
|
|
return nil // Short-circuit: nothing is going to match.
|
|
}
|
|
|
|
// The control flow below handles one-to-one or many-to-one matching.
|
|
// For one-to-many, swap sidedness and account for the swap when calculating
|
|
// values.
|
|
if matching.Card == parser.CardOneToMany {
|
|
lhs, rhs = rhs, lhs
|
|
lhsh, rhsh = rhsh, lhsh
|
|
}
|
|
|
|
// All samples from the rhs hashed by the matching label/values.
|
|
if enh.rightSigs == nil {
|
|
enh.rightSigs = make(map[string]Sample, len(enh.Out))
|
|
} else {
|
|
for k := range enh.rightSigs {
|
|
delete(enh.rightSigs, k)
|
|
}
|
|
}
|
|
rightSigs := enh.rightSigs
|
|
|
|
// Add all rhs samples to a map so we can easily find matches later.
|
|
for i, rs := range rhs {
|
|
sig := rhsh[i].signature
|
|
// The rhs is guaranteed to be the 'one' side. Having multiple samples
|
|
// with the same signature means that the matching is many-to-many.
|
|
if duplSample, found := rightSigs[sig]; found {
|
|
// oneSide represents which side of the vector represents the 'one' in the many-to-one relationship.
|
|
oneSide := "right"
|
|
if matching.Card == parser.CardOneToMany {
|
|
oneSide = "left"
|
|
}
|
|
matchedLabels := rs.Metric.MatchLabels(matching.On, matching.MatchingLabels...)
|
|
// Many-to-many matching not allowed.
|
|
ev.errorf("found duplicate series for the match group %s on the %s hand-side of the operation: [%s, %s]"+
|
|
";many-to-many matching not allowed: matching labels must be unique on one side", matchedLabels.String(), oneSide, rs.Metric.String(), duplSample.Metric.String())
|
|
}
|
|
rightSigs[sig] = rs
|
|
}
|
|
|
|
// Tracks the match-signature. For one-to-one operations the value is nil. For many-to-one
|
|
// the value is a set of signatures to detect duplicated result elements.
|
|
if enh.matchedSigs == nil {
|
|
enh.matchedSigs = make(map[string]map[uint64]struct{}, len(rightSigs))
|
|
} else {
|
|
for k := range enh.matchedSigs {
|
|
delete(enh.matchedSigs, k)
|
|
}
|
|
}
|
|
matchedSigs := enh.matchedSigs
|
|
|
|
// For all lhs samples find a respective rhs sample and perform
|
|
// the binary operation.
|
|
for i, ls := range lhs {
|
|
sig := lhsh[i].signature
|
|
|
|
rs, found := rightSigs[sig] // Look for a match in the rhs Vector.
|
|
if !found {
|
|
continue
|
|
}
|
|
|
|
// Account for potentially swapped sidedness.
|
|
vl, vr := ls.V, rs.V
|
|
if matching.Card == parser.CardOneToMany {
|
|
vl, vr = vr, vl
|
|
}
|
|
value, keep := vectorElemBinop(op, vl, vr)
|
|
if returnBool {
|
|
if keep {
|
|
value = 1.0
|
|
} else {
|
|
value = 0.0
|
|
}
|
|
} else if !keep {
|
|
continue
|
|
}
|
|
metric := resultMetric(ls.Metric, rs.Metric, op, matching, enh)
|
|
if returnBool {
|
|
metric = enh.DropMetricName(metric)
|
|
}
|
|
insertedSigs, exists := matchedSigs[sig]
|
|
if matching.Card == parser.CardOneToOne {
|
|
if exists {
|
|
ev.errorf("multiple matches for labels: many-to-one matching must be explicit (group_left/group_right)")
|
|
}
|
|
matchedSigs[sig] = nil // Set existence to true.
|
|
} else {
|
|
// In many-to-one matching the grouping labels have to ensure a unique metric
|
|
// for the result Vector. Check whether those labels have already been added for
|
|
// the same matching labels.
|
|
insertSig := metric.Hash()
|
|
|
|
if !exists {
|
|
insertedSigs = map[uint64]struct{}{}
|
|
matchedSigs[sig] = insertedSigs
|
|
} else if _, duplicate := insertedSigs[insertSig]; duplicate {
|
|
ev.errorf("multiple matches for labels: grouping labels must ensure unique matches")
|
|
}
|
|
insertedSigs[insertSig] = struct{}{}
|
|
}
|
|
|
|
enh.Out = append(enh.Out, Sample{
|
|
Metric: metric,
|
|
Point: Point{V: value},
|
|
})
|
|
}
|
|
return enh.Out
|
|
}
|
|
|
|
func signatureFunc(on bool, b []byte, names ...string) func(labels.Labels) string {
|
|
sort.Strings(names)
|
|
if on {
|
|
return func(lset labels.Labels) string {
|
|
return string(lset.WithLabels(names...).Bytes(b))
|
|
}
|
|
}
|
|
return func(lset labels.Labels) string {
|
|
return string(lset.WithoutLabels(names...).Bytes(b))
|
|
}
|
|
}
|
|
|
|
// resultMetric returns the metric for the given sample(s) based on the Vector
|
|
// binary operation and the matching options.
|
|
func resultMetric(lhs, rhs labels.Labels, op parser.ItemType, matching *parser.VectorMatching, enh *EvalNodeHelper) labels.Labels {
|
|
if enh.resultMetric == nil {
|
|
enh.resultMetric = make(map[string]labels.Labels, len(enh.Out))
|
|
}
|
|
|
|
if enh.lb == nil {
|
|
enh.lb = labels.NewBuilder(lhs)
|
|
} else {
|
|
enh.lb.Reset(lhs)
|
|
}
|
|
|
|
buf := bytes.NewBuffer(enh.lblResultBuf[:0])
|
|
enh.lblBuf = lhs.Bytes(enh.lblBuf)
|
|
buf.Write(enh.lblBuf)
|
|
enh.lblBuf = rhs.Bytes(enh.lblBuf)
|
|
buf.Write(enh.lblBuf)
|
|
enh.lblResultBuf = buf.Bytes()
|
|
|
|
if ret, ok := enh.resultMetric[string(enh.lblResultBuf)]; ok {
|
|
return ret
|
|
}
|
|
str := string(enh.lblResultBuf)
|
|
|
|
if shouldDropMetricName(op) {
|
|
enh.lb.Del(labels.MetricName)
|
|
}
|
|
|
|
if matching.Card == parser.CardOneToOne {
|
|
if matching.On {
|
|
Outer:
|
|
for _, l := range lhs {
|
|
for _, n := range matching.MatchingLabels {
|
|
if l.Name == n {
|
|
continue Outer
|
|
}
|
|
}
|
|
enh.lb.Del(l.Name)
|
|
}
|
|
} else {
|
|
enh.lb.Del(matching.MatchingLabels...)
|
|
}
|
|
}
|
|
for _, ln := range matching.Include {
|
|
// Included labels from the `group_x` modifier are taken from the "one"-side.
|
|
if v := rhs.Get(ln); v != "" {
|
|
enh.lb.Set(ln, v)
|
|
} else {
|
|
enh.lb.Del(ln)
|
|
}
|
|
}
|
|
|
|
ret := enh.lb.Labels()
|
|
enh.resultMetric[str] = ret
|
|
return ret
|
|
}
|
|
|
|
// VectorscalarBinop evaluates a binary operation between a Vector and a Scalar.
|
|
func (ev *evaluator) VectorscalarBinop(op parser.ItemType, lhs Vector, rhs Scalar, swap, returnBool bool, enh *EvalNodeHelper) Vector {
|
|
for _, lhsSample := range lhs {
|
|
lv, rv := lhsSample.V, rhs.V
|
|
// lhs always contains the Vector. If the original position was different
|
|
// swap for calculating the value.
|
|
if swap {
|
|
lv, rv = rv, lv
|
|
}
|
|
value, keep := vectorElemBinop(op, lv, rv)
|
|
// Catch cases where the scalar is the LHS in a scalar-vector comparison operation.
|
|
// We want to always keep the vector element value as the output value, even if it's on the RHS.
|
|
if op.IsComparisonOperator() && swap {
|
|
value = rv
|
|
}
|
|
if returnBool {
|
|
if keep {
|
|
value = 1.0
|
|
} else {
|
|
value = 0.0
|
|
}
|
|
keep = true
|
|
}
|
|
if keep {
|
|
lhsSample.V = value
|
|
if shouldDropMetricName(op) || returnBool {
|
|
lhsSample.Metric = enh.DropMetricName(lhsSample.Metric)
|
|
}
|
|
enh.Out = append(enh.Out, lhsSample)
|
|
}
|
|
}
|
|
return enh.Out
|
|
}
|
|
|
|
func dropMetricName(l labels.Labels) labels.Labels {
|
|
return labels.NewBuilder(l).Del(labels.MetricName).Labels()
|
|
}
|
|
|
|
// scalarBinop evaluates a binary operation between two Scalars.
|
|
func scalarBinop(op parser.ItemType, lhs, rhs float64) float64 {
|
|
switch op {
|
|
case parser.ADD:
|
|
return lhs + rhs
|
|
case parser.SUB:
|
|
return lhs - rhs
|
|
case parser.MUL:
|
|
return lhs * rhs
|
|
case parser.DIV:
|
|
return lhs / rhs
|
|
case parser.POW:
|
|
return math.Pow(lhs, rhs)
|
|
case parser.MOD:
|
|
return math.Mod(lhs, rhs)
|
|
case parser.EQLC:
|
|
return btos(lhs == rhs)
|
|
case parser.NEQ:
|
|
return btos(lhs != rhs)
|
|
case parser.GTR:
|
|
return btos(lhs > rhs)
|
|
case parser.LSS:
|
|
return btos(lhs < rhs)
|
|
case parser.GTE:
|
|
return btos(lhs >= rhs)
|
|
case parser.LTE:
|
|
return btos(lhs <= rhs)
|
|
case parser.ATAN2:
|
|
return math.Atan2(lhs, rhs)
|
|
}
|
|
panic(errors.Errorf("operator %q not allowed for Scalar operations", op))
|
|
}
|
|
|
|
// vectorElemBinop evaluates a binary operation between two Vector elements.
|
|
func vectorElemBinop(op parser.ItemType, lhs, rhs float64) (float64, bool) {
|
|
switch op {
|
|
case parser.ADD:
|
|
return lhs + rhs, true
|
|
case parser.SUB:
|
|
return lhs - rhs, true
|
|
case parser.MUL:
|
|
return lhs * rhs, true
|
|
case parser.DIV:
|
|
return lhs / rhs, true
|
|
case parser.POW:
|
|
return math.Pow(lhs, rhs), true
|
|
case parser.MOD:
|
|
return math.Mod(lhs, rhs), true
|
|
case parser.EQLC:
|
|
return lhs, lhs == rhs
|
|
case parser.NEQ:
|
|
return lhs, lhs != rhs
|
|
case parser.GTR:
|
|
return lhs, lhs > rhs
|
|
case parser.LSS:
|
|
return lhs, lhs < rhs
|
|
case parser.GTE:
|
|
return lhs, lhs >= rhs
|
|
case parser.LTE:
|
|
return lhs, lhs <= rhs
|
|
case parser.ATAN2:
|
|
return math.Atan2(lhs, rhs), true
|
|
}
|
|
panic(errors.Errorf("operator %q not allowed for operations between Vectors", op))
|
|
}
|
|
|
|
type groupedAggregation struct {
|
|
labels labels.Labels
|
|
value float64
|
|
mean float64
|
|
groupCount int
|
|
heap vectorByValueHeap
|
|
reverseHeap vectorByReverseValueHeap
|
|
}
|
|
|
|
// aggregation evaluates an aggregation operation on a Vector. The provided grouping labels
|
|
// must be sorted.
|
|
func (ev *evaluator) aggregation(op parser.ItemType, grouping []string, without bool, param interface{}, vec Vector, seriesHelper []EvalSeriesHelper, enh *EvalNodeHelper) Vector {
|
|
result := map[uint64]*groupedAggregation{}
|
|
orderedResult := []*groupedAggregation{}
|
|
var k int64
|
|
if op == parser.TOPK || op == parser.BOTTOMK {
|
|
f := param.(float64)
|
|
if !convertibleToInt64(f) {
|
|
ev.errorf("Scalar value %v overflows int64", f)
|
|
}
|
|
k = int64(f)
|
|
if k < 1 {
|
|
return Vector{}
|
|
}
|
|
}
|
|
var q float64
|
|
if op == parser.QUANTILE {
|
|
q = param.(float64)
|
|
}
|
|
var valueLabel string
|
|
var recomputeGroupingKey bool
|
|
if op == parser.COUNT_VALUES {
|
|
valueLabel = param.(string)
|
|
if !model.LabelName(valueLabel).IsValid() {
|
|
ev.errorf("invalid label name %q", valueLabel)
|
|
}
|
|
if !without {
|
|
// We're changing the grouping labels so we have to ensure they're still sorted
|
|
// and we have to flag to recompute the grouping key. Considering the count_values()
|
|
// operator is less frequently used than other aggregations, we're fine having to
|
|
// re-compute the grouping key on each step for this case.
|
|
grouping = append(grouping, valueLabel)
|
|
sort.Strings(grouping)
|
|
recomputeGroupingKey = true
|
|
}
|
|
}
|
|
|
|
lb := labels.NewBuilder(nil)
|
|
var buf []byte
|
|
for si, s := range vec {
|
|
metric := s.Metric
|
|
|
|
if op == parser.COUNT_VALUES {
|
|
lb.Reset(metric)
|
|
lb.Set(valueLabel, strconv.FormatFloat(s.V, 'f', -1, 64))
|
|
metric = lb.Labels()
|
|
|
|
// We've changed the metric so we have to recompute the grouping key.
|
|
recomputeGroupingKey = true
|
|
}
|
|
|
|
// We can use the pre-computed grouping key unless grouping labels have changed.
|
|
var groupingKey uint64
|
|
if !recomputeGroupingKey {
|
|
groupingKey = seriesHelper[si].groupingKey
|
|
} else {
|
|
groupingKey, buf = generateGroupingKey(metric, grouping, without, buf)
|
|
}
|
|
|
|
group, ok := result[groupingKey]
|
|
// Add a new group if it doesn't exist.
|
|
if !ok {
|
|
var m labels.Labels
|
|
|
|
if without {
|
|
lb.Reset(metric)
|
|
lb.Del(grouping...)
|
|
lb.Del(labels.MetricName)
|
|
m = lb.Labels()
|
|
} else {
|
|
m = metric.WithLabels(grouping...)
|
|
}
|
|
newAgg := &groupedAggregation{
|
|
labels: m,
|
|
value: s.V,
|
|
mean: s.V,
|
|
groupCount: 1,
|
|
}
|
|
|
|
result[groupingKey] = newAgg
|
|
orderedResult = append(orderedResult, newAgg)
|
|
|
|
inputVecLen := int64(len(vec))
|
|
resultSize := k
|
|
if k > inputVecLen {
|
|
resultSize = inputVecLen
|
|
} else if k == 0 {
|
|
resultSize = 1
|
|
}
|
|
switch op {
|
|
case parser.STDVAR, parser.STDDEV:
|
|
result[groupingKey].value = 0
|
|
case parser.TOPK, parser.QUANTILE:
|
|
result[groupingKey].heap = make(vectorByValueHeap, 1, resultSize)
|
|
result[groupingKey].heap[0] = Sample{
|
|
Point: Point{V: s.V},
|
|
Metric: s.Metric,
|
|
}
|
|
case parser.BOTTOMK:
|
|
result[groupingKey].reverseHeap = make(vectorByReverseValueHeap, 1, resultSize)
|
|
result[groupingKey].reverseHeap[0] = Sample{
|
|
Point: Point{V: s.V},
|
|
Metric: s.Metric,
|
|
}
|
|
case parser.GROUP:
|
|
result[groupingKey].value = 1
|
|
}
|
|
continue
|
|
}
|
|
|
|
switch op {
|
|
case parser.SUM:
|
|
group.value += s.V
|
|
|
|
case parser.AVG:
|
|
group.groupCount++
|
|
if math.IsInf(group.mean, 0) {
|
|
if math.IsInf(s.V, 0) && (group.mean > 0) == (s.V > 0) {
|
|
// The `mean` and `s.V` values are `Inf` of the same sign. They
|
|
// can't be subtracted, but the value of `mean` is correct
|
|
// already.
|
|
break
|
|
}
|
|
if !math.IsInf(s.V, 0) && !math.IsNaN(s.V) {
|
|
// At this stage, the mean is an infinite. If the added
|
|
// value is neither an Inf or a Nan, we can keep that mean
|
|
// value.
|
|
// This is required because our calculation below removes
|
|
// the mean value, which would look like Inf += x - Inf and
|
|
// end up as a NaN.
|
|
break
|
|
}
|
|
}
|
|
// Divide each side of the `-` by `group.groupCount` to avoid float64 overflows.
|
|
group.mean += s.V/float64(group.groupCount) - group.mean/float64(group.groupCount)
|
|
|
|
case parser.GROUP:
|
|
// Do nothing. Required to avoid the panic in `default:` below.
|
|
|
|
case parser.MAX:
|
|
if group.value < s.V || math.IsNaN(group.value) {
|
|
group.value = s.V
|
|
}
|
|
|
|
case parser.MIN:
|
|
if group.value > s.V || math.IsNaN(group.value) {
|
|
group.value = s.V
|
|
}
|
|
|
|
case parser.COUNT, parser.COUNT_VALUES:
|
|
group.groupCount++
|
|
|
|
case parser.STDVAR, parser.STDDEV:
|
|
group.groupCount++
|
|
delta := s.V - group.mean
|
|
group.mean += delta / float64(group.groupCount)
|
|
group.value += delta * (s.V - group.mean)
|
|
|
|
case parser.TOPK:
|
|
if int64(len(group.heap)) < k || group.heap[0].V < s.V || math.IsNaN(group.heap[0].V) {
|
|
if int64(len(group.heap)) == k {
|
|
if k == 1 { // For k==1 we can replace in-situ.
|
|
group.heap[0] = Sample{
|
|
Point: Point{V: s.V},
|
|
Metric: s.Metric,
|
|
}
|
|
break
|
|
}
|
|
heap.Pop(&group.heap)
|
|
}
|
|
heap.Push(&group.heap, &Sample{
|
|
Point: Point{V: s.V},
|
|
Metric: s.Metric,
|
|
})
|
|
}
|
|
|
|
case parser.BOTTOMK:
|
|
if int64(len(group.reverseHeap)) < k || group.reverseHeap[0].V > s.V || math.IsNaN(group.reverseHeap[0].V) {
|
|
if int64(len(group.reverseHeap)) == k {
|
|
if k == 1 { // For k==1 we can replace in-situ.
|
|
group.reverseHeap[0] = Sample{
|
|
Point: Point{V: s.V},
|
|
Metric: s.Metric,
|
|
}
|
|
break
|
|
}
|
|
heap.Pop(&group.reverseHeap)
|
|
}
|
|
heap.Push(&group.reverseHeap, &Sample{
|
|
Point: Point{V: s.V},
|
|
Metric: s.Metric,
|
|
})
|
|
}
|
|
|
|
case parser.QUANTILE:
|
|
group.heap = append(group.heap, s)
|
|
|
|
default:
|
|
panic(errors.Errorf("expected aggregation operator but got %q", op))
|
|
}
|
|
}
|
|
|
|
// Construct the result Vector from the aggregated groups.
|
|
for _, aggr := range orderedResult {
|
|
switch op {
|
|
case parser.AVG:
|
|
aggr.value = aggr.mean
|
|
|
|
case parser.COUNT, parser.COUNT_VALUES:
|
|
aggr.value = float64(aggr.groupCount)
|
|
|
|
case parser.STDVAR:
|
|
aggr.value = aggr.value / float64(aggr.groupCount)
|
|
|
|
case parser.STDDEV:
|
|
aggr.value = math.Sqrt(aggr.value / float64(aggr.groupCount))
|
|
|
|
case parser.TOPK:
|
|
// The heap keeps the lowest value on top, so reverse it.
|
|
if len(aggr.heap) > 1 {
|
|
sort.Sort(sort.Reverse(aggr.heap))
|
|
}
|
|
for _, v := range aggr.heap {
|
|
enh.Out = append(enh.Out, Sample{
|
|
Metric: v.Metric,
|
|
Point: Point{V: v.V},
|
|
})
|
|
}
|
|
continue // Bypass default append.
|
|
|
|
case parser.BOTTOMK:
|
|
// The heap keeps the highest value on top, so reverse it.
|
|
if len(aggr.reverseHeap) > 1 {
|
|
sort.Sort(sort.Reverse(aggr.reverseHeap))
|
|
}
|
|
for _, v := range aggr.reverseHeap {
|
|
enh.Out = append(enh.Out, Sample{
|
|
Metric: v.Metric,
|
|
Point: Point{V: v.V},
|
|
})
|
|
}
|
|
continue // Bypass default append.
|
|
|
|
case parser.QUANTILE:
|
|
aggr.value = quantile(q, aggr.heap)
|
|
|
|
default:
|
|
// For other aggregations, we already have the right value.
|
|
}
|
|
|
|
enh.Out = append(enh.Out, Sample{
|
|
Metric: aggr.labels,
|
|
Point: Point{V: aggr.value},
|
|
})
|
|
}
|
|
return enh.Out
|
|
}
|
|
|
|
// groupingKey builds and returns the grouping key for the given metric and
|
|
// grouping labels.
|
|
func generateGroupingKey(metric labels.Labels, grouping []string, without bool, buf []byte) (uint64, []byte) {
|
|
if without {
|
|
return metric.HashWithoutLabels(buf, grouping...)
|
|
}
|
|
|
|
if len(grouping) == 0 {
|
|
// No need to generate any hash if there are no grouping labels.
|
|
return 0, buf
|
|
}
|
|
|
|
return metric.HashForLabels(buf, grouping...)
|
|
}
|
|
|
|
// btos returns 1 if b is true, 0 otherwise.
|
|
func btos(b bool) float64 {
|
|
if b {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
// shouldDropMetricName returns whether the metric name should be dropped in the
|
|
// result of the op operation.
|
|
func shouldDropMetricName(op parser.ItemType) bool {
|
|
switch op {
|
|
case parser.ADD, parser.SUB, parser.DIV, parser.MUL, parser.POW, parser.MOD:
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
// NewOriginContext returns a new context with data about the origin attached.
|
|
func NewOriginContext(ctx context.Context, data map[string]interface{}) context.Context {
|
|
return context.WithValue(ctx, QueryOrigin{}, data)
|
|
}
|
|
|
|
func formatDate(t time.Time) string {
|
|
return t.UTC().Format("2006-01-02T15:04:05.000Z07:00")
|
|
}
|
|
|
|
// unwrapParenExpr does the AST equivalent of removing parentheses around a expression.
|
|
func unwrapParenExpr(e *parser.Expr) {
|
|
for {
|
|
if p, ok := (*e).(*parser.ParenExpr); ok {
|
|
*e = p.Expr
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
func unwrapStepInvariantExpr(e parser.Expr) parser.Expr {
|
|
if p, ok := e.(*parser.StepInvariantExpr); ok {
|
|
return p.Expr
|
|
}
|
|
return e
|
|
}
|
|
|
|
// PreprocessExpr wraps all possible step invariant parts of the given expression with
|
|
// StepInvariantExpr. It also resolves the preprocessors.
|
|
func PreprocessExpr(expr parser.Expr, start, end time.Time) parser.Expr {
|
|
isStepInvariant := preprocessExprHelper(expr, start, end)
|
|
if isStepInvariant {
|
|
return newStepInvariantExpr(expr)
|
|
}
|
|
return expr
|
|
}
|
|
|
|
// preprocessExprHelper wraps the child nodes of the expression
|
|
// with a StepInvariantExpr wherever it's step invariant. The returned boolean is true if the
|
|
// passed expression qualifies to be wrapped by StepInvariantExpr.
|
|
// It also resolves the preprocessors.
|
|
func preprocessExprHelper(expr parser.Expr, start, end time.Time) bool {
|
|
switch n := expr.(type) {
|
|
case *parser.VectorSelector:
|
|
if n.StartOrEnd == parser.START {
|
|
n.Timestamp = makeInt64Pointer(timestamp.FromTime(start))
|
|
} else if n.StartOrEnd == parser.END {
|
|
n.Timestamp = makeInt64Pointer(timestamp.FromTime(end))
|
|
}
|
|
return n.Timestamp != nil
|
|
|
|
case *parser.AggregateExpr:
|
|
return preprocessExprHelper(n.Expr, start, end)
|
|
|
|
case *parser.BinaryExpr:
|
|
isInvariant1, isInvariant2 := preprocessExprHelper(n.LHS, start, end), preprocessExprHelper(n.RHS, start, end)
|
|
if isInvariant1 && isInvariant2 {
|
|
return true
|
|
}
|
|
|
|
if isInvariant1 {
|
|
n.LHS = newStepInvariantExpr(n.LHS)
|
|
}
|
|
if isInvariant2 {
|
|
n.RHS = newStepInvariantExpr(n.RHS)
|
|
}
|
|
|
|
return false
|
|
|
|
case *parser.Call:
|
|
_, ok := AtModifierUnsafeFunctions[n.Func.Name]
|
|
isStepInvariant := !ok
|
|
isStepInvariantSlice := make([]bool, len(n.Args))
|
|
for i := range n.Args {
|
|
isStepInvariantSlice[i] = preprocessExprHelper(n.Args[i], start, end)
|
|
isStepInvariant = isStepInvariant && isStepInvariantSlice[i]
|
|
}
|
|
|
|
if isStepInvariant {
|
|
// The function and all arguments are step invariant.
|
|
return true
|
|
}
|
|
|
|
for i, isi := range isStepInvariantSlice {
|
|
if isi {
|
|
n.Args[i] = newStepInvariantExpr(n.Args[i])
|
|
}
|
|
}
|
|
return false
|
|
|
|
case *parser.MatrixSelector:
|
|
return preprocessExprHelper(n.VectorSelector, start, end)
|
|
|
|
case *parser.SubqueryExpr:
|
|
// Since we adjust offset for the @ modifier evaluation,
|
|
// it gets tricky to adjust it for every subquery step.
|
|
// Hence we wrap the inside of subquery irrespective of
|
|
// @ on subquery (given it is also step invariant) so that
|
|
// it is evaluated only once w.r.t. the start time of subquery.
|
|
isInvariant := preprocessExprHelper(n.Expr, start, end)
|
|
if isInvariant {
|
|
n.Expr = newStepInvariantExpr(n.Expr)
|
|
}
|
|
if n.StartOrEnd == parser.START {
|
|
n.Timestamp = makeInt64Pointer(timestamp.FromTime(start))
|
|
} else if n.StartOrEnd == parser.END {
|
|
n.Timestamp = makeInt64Pointer(timestamp.FromTime(end))
|
|
}
|
|
return n.Timestamp != nil
|
|
|
|
case *parser.ParenExpr:
|
|
return preprocessExprHelper(n.Expr, start, end)
|
|
|
|
case *parser.UnaryExpr:
|
|
return preprocessExprHelper(n.Expr, start, end)
|
|
|
|
case *parser.StringLiteral, *parser.NumberLiteral:
|
|
return true
|
|
}
|
|
|
|
panic(fmt.Sprintf("found unexpected node %#v", expr))
|
|
}
|
|
|
|
func newStepInvariantExpr(expr parser.Expr) parser.Expr {
|
|
return &parser.StepInvariantExpr{Expr: expr}
|
|
}
|
|
|
|
// setOffsetForAtModifier modifies the offset of vector and matrix selector
|
|
// and subquery in the tree to accommodate the timestamp of @ modifier.
|
|
// The offset is adjusted w.r.t. the given evaluation time.
|
|
func setOffsetForAtModifier(evalTime int64, expr parser.Expr) {
|
|
getOffset := func(ts *int64, originalOffset time.Duration, path []parser.Node) time.Duration {
|
|
if ts == nil {
|
|
return originalOffset
|
|
}
|
|
|
|
subqOffset, _, subqTs := subqueryTimes(path)
|
|
if subqTs != nil {
|
|
subqOffset += time.Duration(evalTime-*subqTs) * time.Millisecond
|
|
}
|
|
|
|
offsetForTs := time.Duration(evalTime-*ts) * time.Millisecond
|
|
offsetDiff := offsetForTs - subqOffset
|
|
return originalOffset + offsetDiff
|
|
}
|
|
|
|
parser.Inspect(expr, func(node parser.Node, path []parser.Node) error {
|
|
switch n := node.(type) {
|
|
case *parser.VectorSelector:
|
|
n.Offset = getOffset(n.Timestamp, n.OriginalOffset, path)
|
|
|
|
case *parser.MatrixSelector:
|
|
vs := n.VectorSelector.(*parser.VectorSelector)
|
|
vs.Offset = getOffset(vs.Timestamp, vs.OriginalOffset, path)
|
|
|
|
case *parser.SubqueryExpr:
|
|
n.Offset = getOffset(n.Timestamp, n.OriginalOffset, path)
|
|
}
|
|
return nil
|
|
})
|
|
}
|
|
|
|
func makeInt64Pointer(val int64) *int64 {
|
|
valp := new(int64)
|
|
*valp = val
|
|
return valp
|
|
}
|