mirror of https://github.com/prometheus/prometheus
115 lines
3.2 KiB
Go
115 lines
3.2 KiB
Go
// Copyright 2017 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 remote
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import (
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"sync"
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"time"
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"github.com/prometheus/common/model"
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"golang.org/x/net/context"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/storage/local"
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"github.com/prometheus/prometheus/storage/metric"
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)
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// Reader allows reading from multiple remote sources.
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type Reader struct {
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mtx sync.Mutex
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clients []*Client
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}
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// ApplyConfig updates the state as the new config requires.
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func (r *Reader) ApplyConfig(conf *config.Config) error {
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clients := []*Client{}
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for i, rrConf := range conf.RemoteReadConfigs {
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c, err := NewClient(i, &clientConfig{
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url: rrConf.URL,
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timeout: rrConf.RemoteTimeout,
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httpClientConfig: rrConf.HTTPClientConfig,
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})
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if err != nil {
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return err
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}
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clients = append(clients, c)
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}
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r.mtx.Lock()
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defer r.mtx.Unlock()
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r.clients = clients
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return nil
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}
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// Queriers returns a list of Queriers for the currently configured
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// remote read endpoints.
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func (r *Reader) Queriers() []local.Querier {
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r.mtx.Lock()
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defer r.mtx.Unlock()
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queriers := make([]local.Querier, 0, len(r.clients))
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for _, c := range r.clients {
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queriers = append(queriers, &querier{client: c})
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}
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return queriers
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}
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// querier is an adapter to make a Client usable as a promql.Querier.
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type querier struct {
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client *Client
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}
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func (q *querier) QueryRange(ctx context.Context, from, through model.Time, matchers ...*metric.LabelMatcher) ([]local.SeriesIterator, error) {
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return matrixToIterators(q.client.Read(ctx, from, through, matchers))
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}
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func (q *querier) QueryInstant(ctx context.Context, ts model.Time, stalenessDelta time.Duration, matchers ...*metric.LabelMatcher) ([]local.SeriesIterator, error) {
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return matrixToIterators(q.client.Read(ctx, ts.Add(-stalenessDelta), ts, matchers))
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}
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func matrixToIterators(m model.Matrix, err error) ([]local.SeriesIterator, error) {
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if err != nil {
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return nil, err
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}
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its := make([]local.SeriesIterator, 0, len(m))
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for _, ss := range m {
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its = append(its, sampleStreamIterator{
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ss: ss,
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})
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}
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return its, nil
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}
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func (q *querier) MetricsForLabelMatchers(ctx context.Context, from, through model.Time, matcherSets ...metric.LabelMatchers) ([]metric.Metric, error) {
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// TODO: Implement remote metadata querying.
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return nil, nil
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}
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func (q *querier) LastSampleForLabelMatchers(ctx context.Context, cutoff model.Time, matcherSets ...metric.LabelMatchers) (model.Vector, error) {
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// TODO: Implement remote last sample querying.
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return nil, nil
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}
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func (q *querier) LabelValuesForLabelName(ctx context.Context, ln model.LabelName) (model.LabelValues, error) {
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// TODO: Implement remote metadata querying.
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return nil, nil
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}
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func (q *querier) Close() error {
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return nil
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}
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