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prometheus/web/api/v1/api.go

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// Copyright 2016 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package v1
import (
"context"
"fmt"
"math"
"math/rand"
"net"
"net/http"
"net/url"
"os"
"path/filepath"
"sort"
"strconv"
"strings"
"time"
"unsafe"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/grafana/regexp"
jsoniter "github.com/json-iterator/go"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"github.com/prometheus/common/route"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/model/exemplar"
"github.com/prometheus/prometheus/model/histogram"
"github.com/prometheus/prometheus/model/labels"
"github.com/prometheus/prometheus/model/textparse"
"github.com/prometheus/prometheus/model/timestamp"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/promql/parser"
"github.com/prometheus/prometheus/rules"
"github.com/prometheus/prometheus/scrape"
"github.com/prometheus/prometheus/storage"
"github.com/prometheus/prometheus/storage/remote"
"github.com/prometheus/prometheus/tsdb"
"github.com/prometheus/prometheus/tsdb/index"
"github.com/prometheus/prometheus/util/httputil"
"github.com/prometheus/prometheus/util/stats"
)
type status string
const (
statusSuccess status = "success"
statusError status = "error"
)
type errorType string
const (
errorNone errorType = ""
errorTimeout errorType = "timeout"
errorCanceled errorType = "canceled"
errorExec errorType = "execution"
errorBadData errorType = "bad_data"
errorInternal errorType = "internal"
errorUnavailable errorType = "unavailable"
errorNotFound errorType = "not_found"
)
var LocalhostRepresentations = []string{"127.0.0.1", "localhost", "::1"}
type apiError struct {
typ errorType
err error
}
func (e *apiError) Error() string {
return fmt.Sprintf("%s: %s", e.typ, e.err)
}
// TargetRetriever provides the list of active/dropped targets to scrape or not.
type TargetRetriever interface {
TargetsActive() map[string][]*scrape.Target
TargetsDropped() map[string][]*scrape.Target
}
// AlertmanagerRetriever provides a list of all/dropped AlertManager URLs.
type AlertmanagerRetriever interface {
Alertmanagers() []*url.URL
DroppedAlertmanagers() []*url.URL
}
// RulesRetriever provides a list of active rules and alerts.
type RulesRetriever interface {
RuleGroups() []*rules.Group
AlertingRules() []*rules.AlertingRule
}
type StatsRenderer func(context.Context, *stats.Statistics, string) stats.QueryStats
func defaultStatsRenderer(ctx context.Context, s *stats.Statistics, param string) stats.QueryStats {
if param != "" {
return stats.NewQueryStats(s)
}
return nil
}
// PrometheusVersion contains build information about Prometheus.
type PrometheusVersion struct {
Version string `json:"version"`
Revision string `json:"revision"`
Branch string `json:"branch"`
BuildUser string `json:"buildUser"`
BuildDate string `json:"buildDate"`
GoVersion string `json:"goVersion"`
}
// RuntimeInfo contains runtime information about Prometheus.
type RuntimeInfo struct {
StartTime time.Time `json:"startTime"`
CWD string `json:"CWD"`
ReloadConfigSuccess bool `json:"reloadConfigSuccess"`
LastConfigTime time.Time `json:"lastConfigTime"`
CorruptionCount int64 `json:"corruptionCount"`
GoroutineCount int `json:"goroutineCount"`
GOMAXPROCS int `json:"GOMAXPROCS"`
GOGC string `json:"GOGC"`
GODEBUG string `json:"GODEBUG"`
StorageRetention string `json:"storageRetention"`
}
type response struct {
Status status `json:"status"`
Data interface{} `json:"data,omitempty"`
ErrorType errorType `json:"errorType,omitempty"`
Error string `json:"error,omitempty"`
Warnings []string `json:"warnings,omitempty"`
}
type apiFuncResult struct {
data interface{}
err *apiError
warnings storage.Warnings
finalizer func()
}
type apiFunc func(r *http.Request) apiFuncResult
// TSDBAdminStats defines the tsdb interfaces used by the v1 API for admin operations as well as statistics.
type TSDBAdminStats interface {
CleanTombstones() error
Delete(mint, maxt int64, ms ...*labels.Matcher) error
Snapshot(dir string, withHead bool) error
Stats(statsByLabelName string) (*tsdb.Stats, error)
WALReplayStatus() (tsdb.WALReplayStatus, error)
}
// QueryEngine defines the interface for the *promql.Engine, so it can be replaced, wrapped or mocked.
type QueryEngine interface {
SetQueryLogger(l promql.QueryLogger)
NewInstantQuery(q storage.Queryable, opts *promql.QueryOpts, qs string, ts time.Time) (promql.Query, error)
NewRangeQuery(q storage.Queryable, opts *promql.QueryOpts, qs string, start, end time.Time, interval time.Duration) (promql.Query, error)
}
// API can register a set of endpoints in a router and handle
// them using the provided storage and query engine.
type API struct {
Queryable storage.SampleAndChunkQueryable
QueryEngine QueryEngine
ExemplarQueryable storage.ExemplarQueryable
targetRetriever func(context.Context) TargetRetriever
alertmanagerRetriever func(context.Context) AlertmanagerRetriever
rulesRetriever func(context.Context) RulesRetriever
now func() time.Time
config func() config.Config
flagsMap map[string]string
ready func(http.HandlerFunc) http.HandlerFunc
globalURLOptions GlobalURLOptions
db TSDBAdminStats
dbDir string
enableAdmin bool
logger log.Logger
CORSOrigin *regexp.Regexp
buildInfo *PrometheusVersion
runtimeInfo func() (RuntimeInfo, error)
gatherer prometheus.Gatherer
isAgent bool
statsRenderer StatsRenderer
remoteWriteHandler http.Handler
remoteReadHandler http.Handler
}
func init() {
jsoniter.RegisterTypeEncoderFunc("promql.Series", marshalSeriesJSON, marshalSeriesJSONIsEmpty)
jsoniter.RegisterTypeEncoderFunc("promql.Sample", marshalSampleJSON, marshalSampleJSONIsEmpty)
jsoniter.RegisterTypeEncoderFunc("promql.Point", marshalPointJSON, marshalPointJSONIsEmpty)
jsoniter.RegisterTypeEncoderFunc("exemplar.Exemplar", marshalExemplarJSON, marshalExemplarJSONEmpty)
}
// NewAPI returns an initialized API type.
func NewAPI(
qe QueryEngine,
q storage.SampleAndChunkQueryable,
ap storage.Appendable,
eq storage.ExemplarQueryable,
tr func(context.Context) TargetRetriever,
ar func(context.Context) AlertmanagerRetriever,
configFunc func() config.Config,
flagsMap map[string]string,
globalURLOptions GlobalURLOptions,
readyFunc func(http.HandlerFunc) http.HandlerFunc,
db TSDBAdminStats,
dbDir string,
enableAdmin bool,
logger log.Logger,
rr func(context.Context) RulesRetriever,
remoteReadSampleLimit int,
remoteReadConcurrencyLimit int,
remoteReadMaxBytesInFrame int,
isAgent bool,
CORSOrigin *regexp.Regexp,
runtimeInfo func() (RuntimeInfo, error),
buildInfo *PrometheusVersion,
gatherer prometheus.Gatherer,
registerer prometheus.Registerer,
statsRenderer StatsRenderer,
) *API {
a := &API{
QueryEngine: qe,
Queryable: q,
ExemplarQueryable: eq,
targetRetriever: tr,
alertmanagerRetriever: ar,
now: time.Now,
config: configFunc,
flagsMap: flagsMap,
ready: readyFunc,
globalURLOptions: globalURLOptions,
db: db,
dbDir: dbDir,
enableAdmin: enableAdmin,
rulesRetriever: rr,
logger: logger,
CORSOrigin: CORSOrigin,
runtimeInfo: runtimeInfo,
buildInfo: buildInfo,
gatherer: gatherer,
isAgent: isAgent,
statsRenderer: defaultStatsRenderer,
remoteReadHandler: remote.NewReadHandler(logger, registerer, q, configFunc, remoteReadSampleLimit, remoteReadConcurrencyLimit, remoteReadMaxBytesInFrame),
}
if statsRenderer != nil {
a.statsRenderer = statsRenderer
}
if ap != nil {
a.remoteWriteHandler = remote.NewWriteHandler(logger, ap)
}
return a
}
func setUnavailStatusOnTSDBNotReady(r apiFuncResult) apiFuncResult {
if r.err != nil && errors.Cause(r.err.err) == tsdb.ErrNotReady {
r.err.typ = errorUnavailable
}
return r
}
// Register the API's endpoints in the given router.
func (api *API) Register(r *route.Router) {
wrap := func(f apiFunc) http.HandlerFunc {
hf := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
httputil.SetCORS(w, api.CORSOrigin, r)
result := setUnavailStatusOnTSDBNotReady(f(r))
if result.finalizer != nil {
defer result.finalizer()
}
if result.err != nil {
api.respondError(w, result.err, result.data)
return
}
if result.data != nil {
api.respond(w, result.data, result.warnings)
return
}
w.WriteHeader(http.StatusNoContent)
})
return api.ready(httputil.CompressionHandler{
Handler: hf,
}.ServeHTTP)
}
wrapAgent := func(f apiFunc) http.HandlerFunc {
return wrap(func(r *http.Request) apiFuncResult {
if api.isAgent {
return apiFuncResult{nil, &apiError{errorExec, errors.New("unavailable with Prometheus Agent")}, nil, nil}
}
return f(r)
})
}
r.Options("/*path", wrap(api.options))
r.Get("/query", wrapAgent(api.query))
r.Post("/query", wrapAgent(api.query))
r.Get("/query_range", wrapAgent(api.queryRange))
r.Post("/query_range", wrapAgent(api.queryRange))
r.Get("/query_exemplars", wrapAgent(api.queryExemplars))
r.Post("/query_exemplars", wrapAgent(api.queryExemplars))
r.Get("/labels", wrapAgent(api.labelNames))
r.Post("/labels", wrapAgent(api.labelNames))
r.Get("/label/:name/values", wrapAgent(api.labelValues))
r.Get("/series", wrapAgent(api.series))
r.Post("/series", wrapAgent(api.series))
r.Del("/series", wrapAgent(api.dropSeries))
r.Get("/targets", wrap(api.targets))
r.Get("/targets/metadata", wrap(api.targetMetadata))
r.Get("/alertmanagers", wrapAgent(api.alertmanagers))
r.Get("/metadata", wrap(api.metricMetadata))
r.Get("/status/config", wrap(api.serveConfig))
r.Get("/status/runtimeinfo", wrap(api.serveRuntimeInfo))
r.Get("/status/buildinfo", wrap(api.serveBuildInfo))
r.Get("/status/flags", wrap(api.serveFlags))
r.Get("/status/tsdb", wrapAgent(api.serveTSDBStatus))
r.Get("/status/walreplay", api.serveWALReplayStatus)
r.Post("/read", api.ready(api.remoteRead))
r.Post("/write", api.ready(api.remoteWrite))
r.Get("/alerts", wrapAgent(api.alerts))
r.Get("/rules", wrapAgent(api.rules))
// Admin APIs
r.Post("/admin/tsdb/delete_series", wrapAgent(api.deleteSeries))
r.Post("/admin/tsdb/clean_tombstones", wrapAgent(api.cleanTombstones))
r.Post("/admin/tsdb/snapshot", wrapAgent(api.snapshot))
r.Put("/admin/tsdb/delete_series", wrapAgent(api.deleteSeries))
r.Put("/admin/tsdb/clean_tombstones", wrapAgent(api.cleanTombstones))
r.Put("/admin/tsdb/snapshot", wrapAgent(api.snapshot))
}
type queryData struct {
ResultType parser.ValueType `json:"resultType"`
Result parser.Value `json:"result"`
Stats stats.QueryStats `json:"stats,omitempty"`
}
func invalidParamError(err error, parameter string) apiFuncResult {
return apiFuncResult{nil, &apiError{
errorBadData, errors.Wrapf(err, "invalid parameter %q", parameter),
}, nil, nil}
}
func (api *API) options(r *http.Request) apiFuncResult {
return apiFuncResult{nil, nil, nil, nil}
}
func (api *API) query(r *http.Request) (result apiFuncResult) {
ts, err := parseTimeParam(r, "time", api.now())
if err != nil {
return invalidParamError(err, "time")
}
ctx := r.Context()
if to := r.FormValue("timeout"); to != "" {
var cancel context.CancelFunc
timeout, err := parseDuration(to)
if err != nil {
return invalidParamError(err, "timeout")
}
ctx, cancel = context.WithTimeout(ctx, timeout)
defer cancel()
}
opts := extractQueryOpts(r)
qry, err := api.QueryEngine.NewInstantQuery(api.Queryable, opts, r.FormValue("query"), ts)
if err != nil {
return invalidParamError(err, "query")
}
// From now on, we must only return with a finalizer in the result (to
// be called by the caller) or call qry.Close ourselves (which is
// required in the case of a panic).
defer func() {
if result.finalizer == nil {
qry.Close()
}
}()
ctx = httputil.ContextFromRequest(ctx, r)
res := qry.Exec(ctx)
if res.Err != nil {
return apiFuncResult{nil, returnAPIError(res.Err), res.Warnings, qry.Close}
}
// Optional stats field in response if parameter "stats" is not empty.
sr := api.statsRenderer
if sr == nil {
sr = defaultStatsRenderer
}
qs := sr(ctx, qry.Stats(), r.FormValue("stats"))
return apiFuncResult{&queryData{
ResultType: res.Value.Type(),
Result: res.Value,
Stats: qs,
}, nil, res.Warnings, qry.Close}
}
func extractQueryOpts(r *http.Request) *promql.QueryOpts {
return &promql.QueryOpts{
EnablePerStepStats: r.FormValue("stats") == "all",
}
}
func (api *API) queryRange(r *http.Request) (result apiFuncResult) {
start, err := parseTime(r.FormValue("start"))
if err != nil {
return invalidParamError(err, "start")
}
end, err := parseTime(r.FormValue("end"))
if err != nil {
return invalidParamError(err, "end")
}
if end.Before(start) {
return invalidParamError(errors.New("end timestamp must not be before start time"), "end")
}
step, err := parseDuration(r.FormValue("step"))
if err != nil {
return invalidParamError(err, "step")
}
if step <= 0 {
return invalidParamError(errors.New("zero or negative query resolution step widths are not accepted. Try a positive integer"), "step")
}
// For safety, limit the number of returned points per timeseries.
// This is sufficient for 60s resolution for a week or 1h resolution for a year.
if end.Sub(start)/step > 11000 {
err := errors.New("exceeded maximum resolution of 11,000 points per timeseries. Try decreasing the query resolution (?step=XX)")
return apiFuncResult{nil, &apiError{errorBadData, err}, nil, nil}
}
ctx := r.Context()
if to := r.FormValue("timeout"); to != "" {
var cancel context.CancelFunc
timeout, err := parseDuration(to)
if err != nil {
return invalidParamError(err, "timeout")
}
ctx, cancel = context.WithTimeout(ctx, timeout)
defer cancel()
}
opts := extractQueryOpts(r)
qry, err := api.QueryEngine.NewRangeQuery(api.Queryable, opts, r.FormValue("query"), start, end, step)
if err != nil {
return apiFuncResult{nil, &apiError{errorBadData, err}, nil, nil}
}
// From now on, we must only return with a finalizer in the result (to
// be called by the caller) or call qry.Close ourselves (which is
// required in the case of a panic).
defer func() {
if result.finalizer == nil {
qry.Close()
}
}()
ctx = httputil.ContextFromRequest(ctx, r)
res := qry.Exec(ctx)
if res.Err != nil {
return apiFuncResult{nil, returnAPIError(res.Err), res.Warnings, qry.Close}
}
// Optional stats field in response if parameter "stats" is not empty.
sr := api.statsRenderer
if sr == nil {
sr = defaultStatsRenderer
}
qs := sr(ctx, qry.Stats(), r.FormValue("stats"))
return apiFuncResult{&queryData{
ResultType: res.Value.Type(),
Result: res.Value,
Stats: qs,
}, nil, res.Warnings, qry.Close}
}
func (api *API) queryExemplars(r *http.Request) apiFuncResult {
start, err := parseTimeParam(r, "start", minTime)
if err != nil {
return invalidParamError(err, "start")
}
end, err := parseTimeParam(r, "end", maxTime)
if err != nil {
return invalidParamError(err, "end")
}
if end.Before(start) {
err := errors.New("end timestamp must not be before start timestamp")
return apiFuncResult{nil, &apiError{errorBadData, err}, nil, nil}
}
expr, err := parser.ParseExpr(r.FormValue("query"))
if err != nil {
return apiFuncResult{nil, &apiError{errorBadData, err}, nil, nil}
}
selectors := parser.ExtractSelectors(expr)
if len(selectors) < 1 {
return apiFuncResult{nil, nil, nil, nil}
}
ctx := r.Context()
eq, err := api.ExemplarQueryable.ExemplarQuerier(ctx)
if err != nil {
return apiFuncResult{nil, &apiError{errorExec, err}, nil, nil}
}
res, err := eq.Select(timestamp.FromTime(start), timestamp.FromTime(end), selectors...)
if err != nil {
return apiFuncResult{nil, &apiError{errorExec, err}, nil, nil}
}
return apiFuncResult{res, nil, nil, nil}
}
func returnAPIError(err error) *apiError {
if err == nil {
return nil
}
cause := errors.Unwrap(err)
if cause == nil {
cause = err
}
switch cause.(type) {
case promql.ErrQueryCanceled:
return &apiError{errorCanceled, err}
case promql.ErrQueryTimeout:
return &apiError{errorTimeout, err}
case promql.ErrStorage:
return &apiError{errorInternal, err}
}
return &apiError{errorExec, err}
}
func (api *API) labelNames(r *http.Request) apiFuncResult {
start, err := parseTimeParam(r, "start", minTime)
if err != nil {
return invalidParamError(err, "start")
}
end, err := parseTimeParam(r, "end", maxTime)
if err != nil {
return invalidParamError(err, "end")
}
matcherSets, err := parseMatchersParam(r.Form["match[]"])
if err != nil {
return apiFuncResult{nil, &apiError{errorBadData, err}, nil, nil}
}
q, err := api.Queryable.Querier(r.Context(), timestamp.FromTime(start), timestamp.FromTime(end))
if err != nil {
return apiFuncResult{nil, &apiError{errorExec, err}, nil, nil}
}
defer q.Close()
var (
names []string
warnings storage.Warnings
)
if len(matcherSets) > 0 {
labelNamesSet := make(map[string]struct{})
for _, matchers := range matcherSets {
vals, callWarnings, err := q.LabelNames(matchers...)
if err != nil {
return apiFuncResult{nil, &apiError{errorExec, err}, warnings, nil}
}
warnings = append(warnings, callWarnings...)
for _, val := range vals {
labelNamesSet[val] = struct{}{}
}
}
// Convert the map to an array.
names = make([]string, 0, len(labelNamesSet))
for key := range labelNamesSet {
names = append(names, key)
}
sort.Strings(names)
} else {
names, warnings, err = q.LabelNames()
if err != nil {
return apiFuncResult{nil, &apiError{errorExec, err}, warnings, nil}
}
}
if names == nil {
names = []string{}
}
return apiFuncResult{names, nil, warnings, nil}
}
func (api *API) labelValues(r *http.Request) (result apiFuncResult) {
ctx := r.Context()
name := route.Param(ctx, "name")
if !model.LabelNameRE.MatchString(name) {
return apiFuncResult{nil, &apiError{errorBadData, errors.Errorf("invalid label name: %q", name)}, nil, nil}
}
start, err := parseTimeParam(r, "start", minTime)
if err != nil {
return invalidParamError(err, "start")
}
end, err := parseTimeParam(r, "end", maxTime)
if err != nil {
return invalidParamError(err, "end")
}
matcherSets, err := parseMatchersParam(r.Form["match[]"])
if err != nil {
return apiFuncResult{nil, &apiError{errorBadData, err}, nil, nil}
}
q, err := api.Queryable.Querier(r.Context(), timestamp.FromTime(start), timestamp.FromTime(end))
if err != nil {
return apiFuncResult{nil, &apiError{errorExec, err}, nil, nil}
}
// From now on, we must only return with a finalizer in the result (to
// be called by the caller) or call q.Close ourselves (which is required
// in the case of a panic).
defer func() {
if result.finalizer == nil {
q.Close()
}
}()
closer := func() {
q.Close()
}
var (
vals []string
warnings storage.Warnings
)
if len(matcherSets) > 0 {
var callWarnings storage.Warnings
labelValuesSet := make(map[string]struct{})
for _, matchers := range matcherSets {
vals, callWarnings, err = q.LabelValues(name, matchers...)
if err != nil {
return apiFuncResult{nil, &apiError{errorExec, err}, warnings, closer}
}
warnings = append(warnings, callWarnings...)
for _, val := range vals {
labelValuesSet[val] = struct{}{}
}
}
vals = make([]string, 0, len(labelValuesSet))
for val := range labelValuesSet {
vals = append(vals, val)
}
} else {
vals, warnings, err = q.LabelValues(name)
if err != nil {
return apiFuncResult{nil, &apiError{errorExec, err}, warnings, closer}
}
if vals == nil {
vals = []string{}
}
}
sort.Strings(vals)
return apiFuncResult{vals, nil, warnings, closer}
}
var (
minTime = time.Unix(math.MinInt64/1000+62135596801, 0).UTC()
maxTime = time.Unix(math.MaxInt64/1000-62135596801, 999999999).UTC()
minTimeFormatted = minTime.Format(time.RFC3339Nano)
maxTimeFormatted = maxTime.Format(time.RFC3339Nano)
)
func (api *API) series(r *http.Request) (result apiFuncResult) {
if err := r.ParseForm(); err != nil {
return apiFuncResult{nil, &apiError{errorBadData, errors.Wrapf(err, "error parsing form values")}, nil, nil}
}
if len(r.Form["match[]"]) == 0 {
return apiFuncResult{nil, &apiError{errorBadData, errors.New("no match[] parameter provided")}, nil, nil}
}
start, err := parseTimeParam(r, "start", minTime)
if err != nil {
return invalidParamError(err, "start")
}
end, err := parseTimeParam(r, "end", maxTime)
if err != nil {
return invalidParamError(err, "end")
}
matcherSets, err := parseMatchersParam(r.Form["match[]"])
if err != nil {
return invalidParamError(err, "match[]")
}
q, err := api.Queryable.Querier(r.Context(), timestamp.FromTime(start), timestamp.FromTime(end))
if err != nil {
return apiFuncResult{nil, &apiError{errorExec, err}, nil, nil}
}
// From now on, we must only return with a finalizer in the result (to
// be called by the caller) or call q.Close ourselves (which is required
// in the case of a panic).
defer func() {
if result.finalizer == nil {
q.Close()
}
}()
closer := func() {
q.Close()
}
hints := &storage.SelectHints{
Start: timestamp.FromTime(start),
End: timestamp.FromTime(end),
Func: "series", // There is no series function, this token is used for lookups that don't need samples.
}
var sets []storage.SeriesSet
for _, mset := range matcherSets {
// We need to sort this select results to merge (deduplicate) the series sets later.
s := q.Select(true, hints, mset...)
sets = append(sets, s)
}
set := storage.NewMergeSeriesSet(sets, storage.ChainedSeriesMerge)
metrics := []labels.Labels{}
for set.Next() {
metrics = append(metrics, set.At().Labels())
}
warnings := set.Warnings()
if set.Err() != nil {
return apiFuncResult{nil, &apiError{errorExec, set.Err()}, warnings, closer}
}
return apiFuncResult{metrics, nil, warnings, closer}
}
func (api *API) dropSeries(_ *http.Request) apiFuncResult {
return apiFuncResult{nil, &apiError{errorInternal, errors.New("not implemented")}, nil, nil}
}
// Target has the information for one target.
type Target struct {
// Labels before any processing.
DiscoveredLabels map[string]string `json:"discoveredLabels"`
// Any labels that are added to this target and its metrics.
Labels map[string]string `json:"labels"`
ScrapePool string `json:"scrapePool"`
ScrapeURL string `json:"scrapeUrl"`
GlobalURL string `json:"globalUrl"`
LastError string `json:"lastError"`
LastScrape time.Time `json:"lastScrape"`
LastScrapeDuration float64 `json:"lastScrapeDuration"`
Health scrape.TargetHealth `json:"health"`
ScrapeInterval string `json:"scrapeInterval"`
ScrapeTimeout string `json:"scrapeTimeout"`
}
// DroppedTarget has the information for one target that was dropped during relabelling.
type DroppedTarget struct {
// Labels before any processing.
DiscoveredLabels map[string]string `json:"discoveredLabels"`
}
// TargetDiscovery has all the active targets.
type TargetDiscovery struct {
ActiveTargets []*Target `json:"activeTargets"`
DroppedTargets []*DroppedTarget `json:"droppedTargets"`
}
// GlobalURLOptions contains fields used for deriving the global URL for local targets.
type GlobalURLOptions struct {
ListenAddress string
Host string
Scheme string
}
// sanitizeSplitHostPort acts like net.SplitHostPort.
// Additionally, if there is no port in the host passed as input, we return the
// original host, making sure that IPv6 addresses are not surrounded by square
// brackets.
func sanitizeSplitHostPort(input string) (string, string, error) {
host, port, err := net.SplitHostPort(input)
if err != nil && strings.HasSuffix(err.Error(), "missing port in address") {
var errWithPort error
host, _, errWithPort = net.SplitHostPort(input + ":80")
if errWithPort == nil {
err = nil
}
}
return host, port, err
}
func getGlobalURL(u *url.URL, opts GlobalURLOptions) (*url.URL, error) {
host, port, err := sanitizeSplitHostPort(u.Host)
if err != nil {
return u, err
}
for _, lhr := range LocalhostRepresentations {
if host == lhr {
_, ownPort, err := net.SplitHostPort(opts.ListenAddress)
if err != nil {
return u, err
}
if port == ownPort {
// Only in the case where the target is on localhost and its port is
// the same as the one we're listening on, we know for sure that
// we're monitoring our own process and that we need to change the
// scheme, hostname, and port to the externally reachable ones as
// well. We shouldn't need to touch the path at all, since if a
// path prefix is defined, the path under which we scrape ourselves
// should already contain the prefix.
u.Scheme = opts.Scheme
u.Host = opts.Host
} else {
// Otherwise, we only know that localhost is not reachable
// externally, so we replace only the hostname by the one in the
// external URL. It could be the wrong hostname for the service on
// this port, but it's still the best possible guess.
host, _, err := sanitizeSplitHostPort(opts.Host)
if err != nil {
return u, err
}
u.Host = host
if port != "" {
u.Host = net.JoinHostPort(u.Host, port)
}
}
break
}
}
return u, nil
}
func (api *API) targets(r *http.Request) apiFuncResult {
sortKeys := func(targets map[string][]*scrape.Target) ([]string, int) {
var n int
keys := make([]string, 0, len(targets))
for k := range targets {
keys = append(keys, k)
n += len(targets[k])
}
sort.Strings(keys)
return keys, n
}
flatten := func(targets map[string][]*scrape.Target) []*scrape.Target {
keys, n := sortKeys(targets)
res := make([]*scrape.Target, 0, n)
for _, k := range keys {
res = append(res, targets[k]...)
}
return res
}
state := strings.ToLower(r.URL.Query().Get("state"))
showActive := state == "" || state == "any" || state == "active"
showDropped := state == "" || state == "any" || state == "dropped"
res := &TargetDiscovery{}
if showActive {
targetsActive := api.targetRetriever(r.Context()).TargetsActive()
activeKeys, numTargets := sortKeys(targetsActive)
res.ActiveTargets = make([]*Target, 0, numTargets)
for _, key := range activeKeys {
for _, target := range targetsActive[key] {
lastErrStr := ""
lastErr := target.LastError()
if lastErr != nil {
lastErrStr = lastErr.Error()
}
globalURL, err := getGlobalURL(target.URL(), api.globalURLOptions)
res.ActiveTargets = append(res.ActiveTargets, &Target{
DiscoveredLabels: target.DiscoveredLabels().Map(),
Labels: target.Labels().Map(),
ScrapePool: key,
ScrapeURL: target.URL().String(),
GlobalURL: globalURL.String(),
LastError: func() string {
if err == nil && lastErrStr == "" {
return ""
} else if err != nil {
return errors.Wrapf(err, lastErrStr).Error()
}
return lastErrStr
}(),
LastScrape: target.LastScrape(),
LastScrapeDuration: target.LastScrapeDuration().Seconds(),
Health: target.Health(),
ScrapeInterval: target.GetValue(model.ScrapeIntervalLabel),
ScrapeTimeout: target.GetValue(model.ScrapeTimeoutLabel),
})
}
}
} else {
res.ActiveTargets = []*Target{}
}
if showDropped {
tDropped := flatten(api.targetRetriever(r.Context()).TargetsDropped())
res.DroppedTargets = make([]*DroppedTarget, 0, len(tDropped))
for _, t := range tDropped {
res.DroppedTargets = append(res.DroppedTargets, &DroppedTarget{
DiscoveredLabels: t.DiscoveredLabels().Map(),
})
}
} else {
res.DroppedTargets = []*DroppedTarget{}
}
return apiFuncResult{res, nil, nil, nil}
}
func matchLabels(lset labels.Labels, matchers []*labels.Matcher) bool {
for _, m := range matchers {
if !m.Matches(lset.Get(m.Name)) {
return false
}
}
return true
}
func (api *API) targetMetadata(r *http.Request) apiFuncResult {
limit := -1
if s := r.FormValue("limit"); s != "" {
var err error
if limit, err = strconv.Atoi(s); err != nil {
return apiFuncResult{nil, &apiError{errorBadData, errors.New("limit must be a number")}, nil, nil}
}
}
matchTarget := r.FormValue("match_target")
var matchers []*labels.Matcher
var err error
if matchTarget != "" {
matchers, err = parser.ParseMetricSelector(matchTarget)
if err != nil {
return invalidParamError(err, "match_target")
}
}
metric := r.FormValue("metric")
res := []metricMetadata{}
for _, tt := range api.targetRetriever(r.Context()).TargetsActive() {
for _, t := range tt {
if limit >= 0 && len(res) >= limit {
break
}
// Filter targets that don't satisfy the label matchers.
if matchTarget != "" && !matchLabels(t.Labels(), matchers) {
continue
}
// If no metric is specified, get the full list for the target.
if metric == "" {
for _, md := range t.MetadataList() {
res = append(res, metricMetadata{
Target: t.Labels(),
Metric: md.Metric,
Type: md.Type,
Help: md.Help,
Unit: md.Unit,
})
}
continue
}
// Get metadata for the specified metric.
if md, ok := t.Metadata(metric); ok {
res = append(res, metricMetadata{
Target: t.Labels(),
Type: md.Type,
Help: md.Help,
Unit: md.Unit,
})
}
}
}
return apiFuncResult{res, nil, nil, nil}
}
type metricMetadata struct {
Target labels.Labels `json:"target"`
Metric string `json:"metric,omitempty"`
Type textparse.MetricType `json:"type"`
Help string `json:"help"`
Unit string `json:"unit"`
}
// AlertmanagerDiscovery has all the active Alertmanagers.
type AlertmanagerDiscovery struct {
ActiveAlertmanagers []*AlertmanagerTarget `json:"activeAlertmanagers"`
DroppedAlertmanagers []*AlertmanagerTarget `json:"droppedAlertmanagers"`
}
// AlertmanagerTarget has info on one AM.
type AlertmanagerTarget struct {
URL string `json:"url"`
}
func (api *API) alertmanagers(r *http.Request) apiFuncResult {
urls := api.alertmanagerRetriever(r.Context()).Alertmanagers()
droppedURLS := api.alertmanagerRetriever(r.Context()).DroppedAlertmanagers()
ams := &AlertmanagerDiscovery{ActiveAlertmanagers: make([]*AlertmanagerTarget, len(urls)), DroppedAlertmanagers: make([]*AlertmanagerTarget, len(droppedURLS))}
for i, url := range urls {
ams.ActiveAlertmanagers[i] = &AlertmanagerTarget{URL: url.String()}
}
for i, url := range droppedURLS {
ams.DroppedAlertmanagers[i] = &AlertmanagerTarget{URL: url.String()}
}
return apiFuncResult{ams, nil, nil, nil}
}
// AlertDiscovery has info for all active alerts.
type AlertDiscovery struct {
Alerts []*Alert `json:"alerts"`
}
// Alert has info for an alert.
type Alert struct {
Labels labels.Labels `json:"labels"`
Annotations labels.Labels `json:"annotations"`
State string `json:"state"`
ActiveAt *time.Time `json:"activeAt,omitempty"`
Value string `json:"value"`
}
func (api *API) alerts(r *http.Request) apiFuncResult {
alertingRules := api.rulesRetriever(r.Context()).AlertingRules()
alerts := []*Alert{}
for _, alertingRule := range alertingRules {
alerts = append(
alerts,
rulesAlertsToAPIAlerts(alertingRule.ActiveAlerts())...,
)
}
res := &AlertDiscovery{Alerts: alerts}
return apiFuncResult{res, nil, nil, nil}
}
func rulesAlertsToAPIAlerts(rulesAlerts []*rules.Alert) []*Alert {
apiAlerts := make([]*Alert, len(rulesAlerts))
for i, ruleAlert := range rulesAlerts {
apiAlerts[i] = &Alert{
Labels: ruleAlert.Labels,
Annotations: ruleAlert.Annotations,
State: ruleAlert.State.String(),
ActiveAt: &ruleAlert.ActiveAt,
Value: strconv.FormatFloat(ruleAlert.Value, 'e', -1, 64),
}
}
return apiAlerts
}
type metadata struct {
Type textparse.MetricType `json:"type"`
Help string `json:"help"`
Unit string `json:"unit"`
}
func (api *API) metricMetadata(r *http.Request) apiFuncResult {
metrics := map[string]map[metadata]struct{}{}
limit := -1
if s := r.FormValue("limit"); s != "" {
var err error
if limit, err = strconv.Atoi(s); err != nil {
return apiFuncResult{nil, &apiError{errorBadData, errors.New("limit must be a number")}, nil, nil}
}
}
metric := r.FormValue("metric")
for _, tt := range api.targetRetriever(r.Context()).TargetsActive() {
for _, t := range tt {
if metric == "" {
for _, mm := range t.MetadataList() {
m := metadata{Type: mm.Type, Help: mm.Help, Unit: mm.Unit}
ms, ok := metrics[mm.Metric]
if !ok {
ms = map[metadata]struct{}{}
metrics[mm.Metric] = ms
}
ms[m] = struct{}{}
}
continue
}
if md, ok := t.Metadata(metric); ok {
m := metadata{Type: md.Type, Help: md.Help, Unit: md.Unit}
ms, ok := metrics[md.Metric]
if !ok {
ms = map[metadata]struct{}{}
metrics[md.Metric] = ms
}
ms[m] = struct{}{}
}
}
}
// Put the elements from the pseudo-set into a slice for marshaling.
res := map[string][]metadata{}
for name, set := range metrics {
if limit >= 0 && len(res) >= limit {
break
}
s := []metadata{}
for metadata := range set {
s = append(s, metadata)
}
res[name] = s
}
return apiFuncResult{res, nil, nil, nil}
}
// RuleDiscovery has info for all rules
type RuleDiscovery struct {
RuleGroups []*RuleGroup `json:"groups"`
}
// RuleGroup has info for rules which are part of a group
type RuleGroup struct {
Name string `json:"name"`
File string `json:"file"`
// In order to preserve rule ordering, while exposing type (alerting or recording)
// specific properties, both alerting and recording rules are exposed in the
// same array.
Rules []Rule `json:"rules"`
Interval float64 `json:"interval"`
Limit int `json:"limit"`
EvaluationTime float64 `json:"evaluationTime"`
LastEvaluation time.Time `json:"lastEvaluation"`
}
type Rule interface{}
type AlertingRule struct {
// State can be "pending", "firing", "inactive".
State string `json:"state"`
Name string `json:"name"`
Query string `json:"query"`
Duration float64 `json:"duration"`
Labels labels.Labels `json:"labels"`
Annotations labels.Labels `json:"annotations"`
Alerts []*Alert `json:"alerts"`
Health rules.RuleHealth `json:"health"`
LastError string `json:"lastError,omitempty"`
EvaluationTime float64 `json:"evaluationTime"`
LastEvaluation time.Time `json:"lastEvaluation"`
// Type of an alertingRule is always "alerting".
Type string `json:"type"`
}
type RecordingRule struct {
Name string `json:"name"`
Query string `json:"query"`
Labels labels.Labels `json:"labels,omitempty"`
Health rules.RuleHealth `json:"health"`
LastError string `json:"lastError,omitempty"`
EvaluationTime float64 `json:"evaluationTime"`
LastEvaluation time.Time `json:"lastEvaluation"`
// Type of a recordingRule is always "recording".
Type string `json:"type"`
}
func (api *API) rules(r *http.Request) apiFuncResult {
ruleGroups := api.rulesRetriever(r.Context()).RuleGroups()
res := &RuleDiscovery{RuleGroups: make([]*RuleGroup, len(ruleGroups))}
typ := strings.ToLower(r.URL.Query().Get("type"))
if typ != "" && typ != "alert" && typ != "record" {
return invalidParamError(errors.Errorf("not supported value %q", typ), "type")
}
returnAlerts := typ == "" || typ == "alert"
returnRecording := typ == "" || typ == "record"
for i, grp := range ruleGroups {
apiRuleGroup := &RuleGroup{
Name: grp.Name(),
File: grp.File(),
Interval: grp.Interval().Seconds(),
Limit: grp.Limit(),
Rules: []Rule{},
EvaluationTime: grp.GetEvaluationTime().Seconds(),
LastEvaluation: grp.GetLastEvaluation(),
}
for _, r := range grp.Rules() {
var enrichedRule Rule
lastError := ""
if r.LastError() != nil {
lastError = r.LastError().Error()
}
switch rule := r.(type) {
case *rules.AlertingRule:
if !returnAlerts {
break
}
enrichedRule = AlertingRule{
State: rule.State().String(),
Name: rule.Name(),
Query: rule.Query().String(),
Duration: rule.HoldDuration().Seconds(),
Labels: rule.Labels(),
Annotations: rule.Annotations(),
Alerts: rulesAlertsToAPIAlerts(rule.ActiveAlerts()),
Health: rule.Health(),
LastError: lastError,
EvaluationTime: rule.GetEvaluationDuration().Seconds(),
LastEvaluation: rule.GetEvaluationTimestamp(),
Type: "alerting",
}
case *rules.RecordingRule:
if !returnRecording {
break
}
enrichedRule = RecordingRule{
Name: rule.Name(),
Query: rule.Query().String(),
Labels: rule.Labels(),
Health: rule.Health(),
LastError: lastError,
EvaluationTime: rule.GetEvaluationDuration().Seconds(),
LastEvaluation: rule.GetEvaluationTimestamp(),
Type: "recording",
}
default:
err := errors.Errorf("failed to assert type of rule '%v'", rule.Name())
return apiFuncResult{nil, &apiError{errorInternal, err}, nil, nil}
}
if enrichedRule != nil {
apiRuleGroup.Rules = append(apiRuleGroup.Rules, enrichedRule)
}
}
res.RuleGroups[i] = apiRuleGroup
}
return apiFuncResult{res, nil, nil, nil}
}
type prometheusConfig struct {
YAML string `json:"yaml"`
}
func (api *API) serveRuntimeInfo(_ *http.Request) apiFuncResult {
status, err := api.runtimeInfo()
if err != nil {
return apiFuncResult{status, &apiError{errorInternal, err}, nil, nil}
}
return apiFuncResult{status, nil, nil, nil}
}
func (api *API) serveBuildInfo(_ *http.Request) apiFuncResult {
return apiFuncResult{api.buildInfo, nil, nil, nil}
}
func (api *API) serveConfig(_ *http.Request) apiFuncResult {
cfg := &prometheusConfig{
YAML: api.config().String(),
}
return apiFuncResult{cfg, nil, nil, nil}
}
func (api *API) serveFlags(_ *http.Request) apiFuncResult {
return apiFuncResult{api.flagsMap, nil, nil, nil}
}
// TSDBStat holds the information about individual cardinality.
type TSDBStat struct {
Name string `json:"name"`
Value uint64 `json:"value"`
}
// HeadStats has information about the TSDB head.
type HeadStats struct {
NumSeries uint64 `json:"numSeries"`
NumLabelPairs int `json:"numLabelPairs"`
ChunkCount int64 `json:"chunkCount"`
MinTime int64 `json:"minTime"`
MaxTime int64 `json:"maxTime"`
}
// TSDBStatus has information of cardinality statistics from postings.
type TSDBStatus struct {
HeadStats HeadStats `json:"headStats"`
SeriesCountByMetricName []TSDBStat `json:"seriesCountByMetricName"`
LabelValueCountByLabelName []TSDBStat `json:"labelValueCountByLabelName"`
MemoryInBytesByLabelName []TSDBStat `json:"memoryInBytesByLabelName"`
SeriesCountByLabelValuePair []TSDBStat `json:"seriesCountByLabelValuePair"`
}
// TSDBStatsFromIndexStats converts a index.Stat slice to a TSDBStat slice.
func TSDBStatsFromIndexStats(stats []index.Stat) []TSDBStat {
result := make([]TSDBStat, 0, len(stats))
for _, item := range stats {
item := TSDBStat{Name: item.Name, Value: item.Count}
result = append(result, item)
}
return result
}
func (api *API) serveTSDBStatus(*http.Request) apiFuncResult {
s, err := api.db.Stats(labels.MetricName)
if err != nil {
return apiFuncResult{nil, &apiError{errorInternal, err}, nil, nil}
}
metrics, err := api.gatherer.Gather()
if err != nil {
return apiFuncResult{nil, &apiError{errorInternal, fmt.Errorf("error gathering runtime status: %s", err)}, nil, nil}
}
chunkCount := int64(math.NaN())
for _, mF := range metrics {
if *mF.Name == "prometheus_tsdb_head_chunks" {
m := *mF.Metric[0]
if m.Gauge != nil {
chunkCount = int64(m.Gauge.GetValue())
break
}
}
}
return apiFuncResult{TSDBStatus{
HeadStats: HeadStats{
NumSeries: s.NumSeries,
ChunkCount: chunkCount,
MinTime: s.MinTime,
MaxTime: s.MaxTime,
NumLabelPairs: s.IndexPostingStats.NumLabelPairs,
},
SeriesCountByMetricName: TSDBStatsFromIndexStats(s.IndexPostingStats.CardinalityMetricsStats),
LabelValueCountByLabelName: TSDBStatsFromIndexStats(s.IndexPostingStats.CardinalityLabelStats),
MemoryInBytesByLabelName: TSDBStatsFromIndexStats(s.IndexPostingStats.LabelValueStats),
SeriesCountByLabelValuePair: TSDBStatsFromIndexStats(s.IndexPostingStats.LabelValuePairsStats),
}, nil, nil, nil}
}
type walReplayStatus struct {
Min int `json:"min"`
Max int `json:"max"`
Current int `json:"current"`
}
func (api *API) serveWALReplayStatus(w http.ResponseWriter, r *http.Request) {
httputil.SetCORS(w, api.CORSOrigin, r)
status, err := api.db.WALReplayStatus()
if err != nil {
api.respondError(w, &apiError{errorInternal, err}, nil)
}
api.respond(w, walReplayStatus{
Min: status.Min,
Max: status.Max,
Current: status.Current,
}, nil)
}
func (api *API) remoteRead(w http.ResponseWriter, r *http.Request) {
// This is only really for tests - this will never be nil IRL.
if api.remoteReadHandler != nil {
api.remoteReadHandler.ServeHTTP(w, r)
} else {
http.Error(w, "not found", http.StatusNotFound)
}
}
func (api *API) remoteWrite(w http.ResponseWriter, r *http.Request) {
if api.remoteWriteHandler != nil {
api.remoteWriteHandler.ServeHTTP(w, r)
} else {
http.Error(w, "remote write receiver needs to be enabled with --enable-feature=remote-write-receiver", http.StatusNotFound)
}
}
func (api *API) deleteSeries(r *http.Request) apiFuncResult {
if !api.enableAdmin {
return apiFuncResult{nil, &apiError{errorUnavailable, errors.New("admin APIs disabled")}, nil, nil}
}
if err := r.ParseForm(); err != nil {
return apiFuncResult{nil, &apiError{errorBadData, errors.Wrap(err, "error parsing form values")}, nil, nil}
}
if len(r.Form["match[]"]) == 0 {
return apiFuncResult{nil, &apiError{errorBadData, errors.New("no match[] parameter provided")}, nil, nil}
}
start, err := parseTimeParam(r, "start", minTime)
if err != nil {
return invalidParamError(err, "start")
}
end, err := parseTimeParam(r, "end", maxTime)
if err != nil {
return invalidParamError(err, "end")
}
for _, s := range r.Form["match[]"] {
matchers, err := parser.ParseMetricSelector(s)
if err != nil {
return invalidParamError(err, "match[]")
}
if err := api.db.Delete(timestamp.FromTime(start), timestamp.FromTime(end), matchers...); err != nil {
return apiFuncResult{nil, &apiError{errorInternal, err}, nil, nil}
}
}
return apiFuncResult{nil, nil, nil, nil}
}
func (api *API) snapshot(r *http.Request) apiFuncResult {
if !api.enableAdmin {
return apiFuncResult{nil, &apiError{errorUnavailable, errors.New("admin APIs disabled")}, nil, nil}
}
var (
skipHead bool
err error
)
if r.FormValue("skip_head") != "" {
skipHead, err = strconv.ParseBool(r.FormValue("skip_head"))
if err != nil {
return invalidParamError(errors.Wrapf(err, "unable to parse boolean"), "skip_head")
}
}
var (
snapdir = filepath.Join(api.dbDir, "snapshots")
name = fmt.Sprintf("%s-%016x",
time.Now().UTC().Format("20060102T150405Z0700"),
rand.Int63())
dir = filepath.Join(snapdir, name)
)
if err := os.MkdirAll(dir, 0o777); err != nil {
return apiFuncResult{nil, &apiError{errorInternal, errors.Wrap(err, "create snapshot directory")}, nil, nil}
}
if err := api.db.Snapshot(dir, !skipHead); err != nil {
return apiFuncResult{nil, &apiError{errorInternal, errors.Wrap(err, "create snapshot")}, nil, nil}
}
return apiFuncResult{struct {
Name string `json:"name"`
}{name}, nil, nil, nil}
}
func (api *API) cleanTombstones(r *http.Request) apiFuncResult {
if !api.enableAdmin {
return apiFuncResult{nil, &apiError{errorUnavailable, errors.New("admin APIs disabled")}, nil, nil}
}
if err := api.db.CleanTombstones(); err != nil {
return apiFuncResult{nil, &apiError{errorInternal, err}, nil, nil}
}
return apiFuncResult{nil, nil, nil, nil}
}
func (api *API) respond(w http.ResponseWriter, data interface{}, warnings storage.Warnings) {
statusMessage := statusSuccess
var warningStrings []string
for _, warning := range warnings {
warningStrings = append(warningStrings, warning.Error())
}
json := jsoniter.ConfigCompatibleWithStandardLibrary
b, err := json.Marshal(&response{
Status: statusMessage,
Data: data,
Warnings: warningStrings,
})
if err != nil {
level.Error(api.logger).Log("msg", "error marshaling json response", "err", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusOK)
if n, err := w.Write(b); err != nil {
level.Error(api.logger).Log("msg", "error writing response", "bytesWritten", n, "err", err)
}
}
func (api *API) respondError(w http.ResponseWriter, apiErr *apiError, data interface{}) {
json := jsoniter.ConfigCompatibleWithStandardLibrary
b, err := json.Marshal(&response{
Status: statusError,
ErrorType: apiErr.typ,
Error: apiErr.err.Error(),
Data: data,
})
if err != nil {
level.Error(api.logger).Log("msg", "error marshaling json response", "err", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
var code int
switch apiErr.typ {
case errorBadData:
code = http.StatusBadRequest
case errorExec:
code = http.StatusUnprocessableEntity
case errorCanceled, errorTimeout:
code = http.StatusServiceUnavailable
case errorInternal:
code = http.StatusInternalServerError
case errorNotFound:
code = http.StatusNotFound
default:
code = http.StatusInternalServerError
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(code)
if n, err := w.Write(b); err != nil {
level.Error(api.logger).Log("msg", "error writing response", "bytesWritten", n, "err", err)
}
}
func parseTimeParam(r *http.Request, paramName string, defaultValue time.Time) (time.Time, error) {
val := r.FormValue(paramName)
if val == "" {
return defaultValue, nil
}
result, err := parseTime(val)
if err != nil {
return time.Time{}, errors.Wrapf(err, "Invalid time value for '%s'", paramName)
}
return result, nil
}
func parseTime(s string) (time.Time, error) {
if t, err := strconv.ParseFloat(s, 64); err == nil {
s, ns := math.Modf(t)
ns = math.Round(ns*1000) / 1000
return time.Unix(int64(s), int64(ns*float64(time.Second))).UTC(), nil
}
if t, err := time.Parse(time.RFC3339Nano, s); err == nil {
return t, nil
}
// Stdlib's time parser can only handle 4 digit years. As a workaround until
// that is fixed we want to at least support our own boundary times.
// Context: https://github.com/prometheus/client_golang/issues/614
// Upstream issue: https://github.com/golang/go/issues/20555
switch s {
case minTimeFormatted:
return minTime, nil
case maxTimeFormatted:
return maxTime, nil
}
return time.Time{}, errors.Errorf("cannot parse %q to a valid timestamp", s)
}
func parseDuration(s string) (time.Duration, error) {
if d, err := strconv.ParseFloat(s, 64); err == nil {
ts := d * float64(time.Second)
if ts > float64(math.MaxInt64) || ts < float64(math.MinInt64) {
return 0, errors.Errorf("cannot parse %q to a valid duration. It overflows int64", s)
}
return time.Duration(ts), nil
}
if d, err := model.ParseDuration(s); err == nil {
return time.Duration(d), nil
}
return 0, errors.Errorf("cannot parse %q to a valid duration", s)
}
func parseMatchersParam(matchers []string) ([][]*labels.Matcher, error) {
var matcherSets [][]*labels.Matcher
for _, s := range matchers {
matchers, err := parser.ParseMetricSelector(s)
if err != nil {
return nil, err
}
matcherSets = append(matcherSets, matchers)
}
OUTER:
for _, ms := range matcherSets {
for _, lm := range ms {
if lm != nil && !lm.Matches("") {
continue OUTER
}
}
return nil, errors.New("match[] must contain at least one non-empty matcher")
}
return matcherSets, nil
}
// marshalSeriesJSON writes something like the following:
//
// {
// "metric" : {
// "__name__" : "up",
// "job" : "prometheus",
// "instance" : "localhost:9090"
// },
// "values": [
// [ 1435781451.781, "1" ],
// < more values>
// ],
// "histograms": [
// [ 1435781451.781, { < histogram, see below > } ],
// < more histograms >
// ],
// },
func marshalSeriesJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
s := *((*promql.Series)(ptr))
stream.WriteObjectStart()
stream.WriteObjectField(`metric`)
m, err := s.Metric.MarshalJSON()
if err != nil {
stream.Error = err
return
}
stream.SetBuffer(append(stream.Buffer(), m...))
// We make two passes through the series here: In the first marshaling
// all value points, in the second marshaling all histogram
// points. That's probably cheaper than just one pass in which we copy
// out histogram Points into a newly allocated slice for separate
// marshaling. (Could be benchmarked, though.)
var foundValue, foundHistogram bool
for _, p := range s.Points {
if p.H == nil {
stream.WriteMore()
if !foundValue {
stream.WriteObjectField(`values`)
stream.WriteArrayStart()
}
foundValue = true
marshalPointJSON(unsafe.Pointer(&p), stream)
} else {
foundHistogram = true
}
}
if foundValue {
stream.WriteArrayEnd()
}
if foundHistogram {
firstHistogram := true
for _, p := range s.Points {
if p.H != nil {
stream.WriteMore()
if firstHistogram {
stream.WriteObjectField(`histograms`)
stream.WriteArrayStart()
}
firstHistogram = false
marshalPointJSON(unsafe.Pointer(&p), stream)
}
}
stream.WriteArrayEnd()
}
stream.WriteObjectEnd()
}
func marshalSeriesJSONIsEmpty(ptr unsafe.Pointer) bool {
return false
}
// marshalSampleJSON writes something like the following for normal value samples:
//
// {
// "metric" : {
// "__name__" : "up",
// "job" : "prometheus",
// "instance" : "localhost:9090"
// },
// "value": [ 1435781451.781, "1" ]
// },
//
// For histogram samples, it writes something like this:
//
// {
// "metric" : {
// "__name__" : "up",
// "job" : "prometheus",
// "instance" : "localhost:9090"
// },
// "histogram": [ 1435781451.781, { < histogram, see below > } ]
// },
func marshalSampleJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
s := *((*promql.Sample)(ptr))
stream.WriteObjectStart()
stream.WriteObjectField(`metric`)
m, err := s.Metric.MarshalJSON()
if err != nil {
stream.Error = err
return
}
stream.SetBuffer(append(stream.Buffer(), m...))
stream.WriteMore()
if s.Point.H == nil {
stream.WriteObjectField(`value`)
} else {
stream.WriteObjectField(`histogram`)
}
marshalPointJSON(unsafe.Pointer(&s.Point), stream)
stream.WriteObjectEnd()
}
func marshalSampleJSONIsEmpty(ptr unsafe.Pointer) bool {
return false
}
// marshalPointJSON writes `[ts, "val"]`.
func marshalPointJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
p := *((*promql.Point)(ptr))
stream.WriteArrayStart()
marshalTimestamp(p.T, stream)
stream.WriteMore()
if p.H == nil {
marshalValue(p.V, stream)
} else {
marshalHistogram(p.H, stream)
}
stream.WriteArrayEnd()
}
func marshalPointJSONIsEmpty(ptr unsafe.Pointer) bool {
return false
}
// marshalHistogramJSON writes something like:
//
// {
// "count": "42",
// "sum": "34593.34",
// "buckets": [
// [ 3, "-0.25", "0.25", "3"],
// [ 0, "0.25", "0.5", "12"],
// [ 0, "0.5", "1", "21"],
// [ 0, "2", "4", "6"]
// ]
// }
//
// The 1st element in each bucket array determines if the boundaries are
// inclusive (AKA closed) or exclusive (AKA open):
// 0: lower exclusive, upper inclusive
// 1: lower inclusive, upper exclusive
// 2: both exclusive
// 3: both inclusive
//
// The 2nd and 3rd elements are the lower and upper boundary. The 4th element is
// the bucket count.
func marshalHistogram(h *histogram.FloatHistogram, stream *jsoniter.Stream) {
stream.WriteObjectStart()
stream.WriteObjectField(`count`)
marshalValue(h.Count, stream)
stream.WriteMore()
stream.WriteObjectField(`sum`)
marshalValue(h.Sum, stream)
bucketFound := false
it := h.AllBucketIterator()
for it.Next() {
bucket := it.At()
if bucket.Count == 0 {
continue // No need to expose empty buckets in JSON.
}
stream.WriteMore()
if !bucketFound {
stream.WriteObjectField(`buckets`)
stream.WriteArrayStart()
}
bucketFound = true
boundaries := 2 // Exclusive on both sides AKA open interval.
if bucket.LowerInclusive {
if bucket.UpperInclusive {
boundaries = 3 // Inclusive on both sides AKA closed interval.
} else {
boundaries = 1 // Inclusive only on lower end AKA right open.
}
} else {
if bucket.UpperInclusive {
boundaries = 0 // Inclusive only on upper end AKA left open.
}
}
stream.WriteArrayStart()
stream.WriteInt(boundaries)
stream.WriteMore()
marshalValue(bucket.Lower, stream)
stream.WriteMore()
marshalValue(bucket.Upper, stream)
stream.WriteMore()
marshalValue(bucket.Count, stream)
stream.WriteArrayEnd()
}
if bucketFound {
stream.WriteArrayEnd()
}
stream.WriteObjectEnd()
}
// marshalExemplarJSON writes.
// {
// labels: <labels>,
// value: "<string>",
// timestamp: <float>
// }
func marshalExemplarJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
p := *((*exemplar.Exemplar)(ptr))
stream.WriteObjectStart()
// "labels" key.
stream.WriteObjectField(`labels`)
lbls, err := p.Labels.MarshalJSON()
if err != nil {
stream.Error = err
return
}
stream.SetBuffer(append(stream.Buffer(), lbls...))
// "value" key.
stream.WriteMore()
stream.WriteObjectField(`value`)
marshalValue(p.Value, stream)
// "timestamp" key.
stream.WriteMore()
stream.WriteObjectField(`timestamp`)
marshalTimestamp(p.Ts, stream)
// marshalTimestamp(p.Ts, stream)
stream.WriteObjectEnd()
}
func marshalExemplarJSONEmpty(ptr unsafe.Pointer) bool {
return false
}
func marshalTimestamp(t int64, stream *jsoniter.Stream) {
// Write out the timestamp as a float divided by 1000.
// This is ~3x faster than converting to a float.
if t < 0 {
stream.WriteRaw(`-`)
t = -t
}
stream.WriteInt64(t / 1000)
fraction := t % 1000
if fraction != 0 {
stream.WriteRaw(`.`)
if fraction < 100 {
stream.WriteRaw(`0`)
}
if fraction < 10 {
stream.WriteRaw(`0`)
}
stream.WriteInt64(fraction)
}
}
func marshalValue(v float64, stream *jsoniter.Stream) {
stream.WriteRaw(`"`)
// Taken from https://github.com/json-iterator/go/blob/master/stream_float.go#L71 as a workaround
// to https://github.com/json-iterator/go/issues/365 (jsoniter, to follow json standard, doesn't allow inf/nan).
buf := stream.Buffer()
abs := math.Abs(v)
fmt := byte('f')
// Note: Must use float32 comparisons for underlying float32 value to get precise cutoffs right.
if abs != 0 {
if abs < 1e-6 || abs >= 1e21 {
fmt = 'e'
}
}
buf = strconv.AppendFloat(buf, v, fmt, -1, 64)
stream.SetBuffer(buf)
stream.WriteRaw(`"`)
}
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