VictoriaMetrics/app/vmselect/main.go

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package vmselect
import (
"errors"
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"flag"
"fmt"
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"net/http"
"strings"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmselect/graphite"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmselect/netstorage"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmselect/prometheus"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmselect/promql"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmselect/searchutils"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmstorage"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/cgroup"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/fs"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/httpserver"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/timerpool"
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"github.com/VictoriaMetrics/metrics"
)
var (
deleteAuthKey = flag.String("deleteAuthKey", "", "authKey for metrics' deletion via /api/v1/admin/tsdb/delete_series and /tags/delSeries")
maxConcurrentRequests = flag.Int("search.maxConcurrentRequests", getDefaultMaxConcurrentRequests(), "The maximum number of concurrent search requests. "+
"It shouldn't be high, since a single request can saturate all the CPU cores. See also -search.maxQueueDuration")
maxQueueDuration = flag.Duration("search.maxQueueDuration", 10*time.Second, "The maximum time the request waits for execution when -search.maxConcurrentRequests "+
"limit is reached; see also -search.maxQueryDuration")
resetCacheAuthKey = flag.String("search.resetCacheAuthKey", "", "Optional authKey for resetting rollup cache via /internal/resetRollupResultCache call")
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)
func getDefaultMaxConcurrentRequests() int {
n := cgroup.AvailableCPUs()
if n <= 4 {
n *= 2
}
if n > 16 {
// A single request can saturate all the CPU cores, so there is no sense
// in allowing higher number of concurrent requests - they will just contend
// for unavailable CPU time.
n = 16
}
return n
}
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// Init initializes vmselect
func Init() {
tmpDirPath := *vmstorage.DataPath + "/tmp"
fs.RemoveDirContents(tmpDirPath)
netstorage.InitTmpBlocksDir(tmpDirPath)
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promql.InitRollupResultCache(*vmstorage.DataPath + "/cache/rollupResult")
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concurrencyCh = make(chan struct{}, *maxConcurrentRequests)
}
// Stop stops vmselect
func Stop() {
promql.StopRollupResultCache()
}
var concurrencyCh chan struct{}
var (
concurrencyLimitReached = metrics.NewCounter(`vm_concurrent_select_limit_reached_total`)
concurrencyLimitTimeout = metrics.NewCounter(`vm_concurrent_select_limit_timeout_total`)
_ = metrics.NewGauge(`vm_concurrent_select_capacity`, func() float64 {
return float64(cap(concurrencyCh))
})
_ = metrics.NewGauge(`vm_concurrent_select_current`, func() float64 {
return float64(len(concurrencyCh))
})
)
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// RequestHandler handles remote read API requests for Prometheus
func RequestHandler(w http.ResponseWriter, r *http.Request) bool {
startTime := time.Now()
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// Limit the number of concurrent queries.
select {
case concurrencyCh <- struct{}{}:
defer func() { <-concurrencyCh }()
default:
// Sleep for a while until giving up. This should resolve short bursts in requests.
concurrencyLimitReached.Inc()
d := searchutils.GetMaxQueryDuration(r)
if d > *maxQueueDuration {
d = *maxQueueDuration
}
t := timerpool.Get(d)
select {
case concurrencyCh <- struct{}{}:
timerpool.Put(t)
defer func() { <-concurrencyCh }()
case <-t.C:
timerpool.Put(t)
concurrencyLimitTimeout.Inc()
err := &httpserver.ErrorWithStatusCode{
Err: fmt.Errorf("cannot handle more than %d concurrent search requests during %s; possible solutions: "+
"increase `-search.maxQueueDuration`; increase `-search.maxQueryDuration`; increase `-search.maxConcurrentRequests`; "+
"increase server capacity",
*maxConcurrentRequests, d),
StatusCode: http.StatusServiceUnavailable,
}
httpserver.Errorf(w, r, "%s", err)
return true
}
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}
path := strings.Replace(r.URL.Path, "//", "/", -1)
if path == "/internal/resetRollupResultCache" {
if len(*resetCacheAuthKey) > 0 && r.FormValue("authKey") != *resetCacheAuthKey {
sendPrometheusError(w, r, fmt.Errorf("invalid authKey=%q for %q", r.FormValue("authKey"), path))
return true
}
promql.ResetRollupResultCache()
return true
}
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if strings.HasPrefix(path, "/api/v1/label/") {
s := r.URL.Path[len("/api/v1/label/"):]
if strings.HasSuffix(s, "/values") {
labelValuesRequests.Inc()
labelName := s[:len(s)-len("/values")]
httpserver.EnableCORS(w, r)
if err := prometheus.LabelValuesHandler(startTime, labelName, w, r); err != nil {
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labelValuesErrors.Inc()
sendPrometheusError(w, r, err)
return true
}
return true
}
}
if strings.HasPrefix(path, "/tags/") && !isGraphiteTagsPath(path) {
tagName := r.URL.Path[len("/tags/"):]
graphiteTagValuesRequests.Inc()
if err := graphite.TagValuesHandler(startTime, tagName, w, r); err != nil {
graphiteTagValuesErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
return true
}
return true
}
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switch path {
case "/api/v1/query":
queryRequests.Inc()
httpserver.EnableCORS(w, r)
if err := prometheus.QueryHandler(startTime, w, r); err != nil {
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queryErrors.Inc()
sendPrometheusError(w, r, err)
return true
}
return true
case "/api/v1/query_range":
queryRangeRequests.Inc()
httpserver.EnableCORS(w, r)
if err := prometheus.QueryRangeHandler(startTime, w, r); err != nil {
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queryRangeErrors.Inc()
sendPrometheusError(w, r, err)
return true
}
return true
case "/api/v1/series":
seriesRequests.Inc()
httpserver.EnableCORS(w, r)
if err := prometheus.SeriesHandler(startTime, w, r); err != nil {
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seriesErrors.Inc()
sendPrometheusError(w, r, err)
return true
}
return true
case "/api/v1/series/count":
seriesCountRequests.Inc()
httpserver.EnableCORS(w, r)
if err := prometheus.SeriesCountHandler(startTime, w, r); err != nil {
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seriesCountErrors.Inc()
sendPrometheusError(w, r, err)
return true
}
return true
case "/api/v1/labels":
labelsRequests.Inc()
httpserver.EnableCORS(w, r)
if err := prometheus.LabelsHandler(startTime, w, r); err != nil {
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labelsErrors.Inc()
sendPrometheusError(w, r, err)
return true
}
return true
case "/api/v1/labels/count":
labelsCountRequests.Inc()
httpserver.EnableCORS(w, r)
if err := prometheus.LabelsCountHandler(startTime, w, r); err != nil {
labelsCountErrors.Inc()
sendPrometheusError(w, r, err)
return true
}
return true
case "/api/v1/status/top_queries":
topQueriesRequests.Inc()
if err := prometheus.QueryStatsHandler(startTime, w, r); err != nil {
topQueriesErrors.Inc()
sendPrometheusError(w, r, fmt.Errorf("cannot query status endpoint: %w", err))
return true
}
return true
case "/api/v1/status/tsdb":
statusTSDBRequests.Inc()
if err := prometheus.TSDBStatusHandler(startTime, w, r); err != nil {
statusTSDBErrors.Inc()
sendPrometheusError(w, r, err)
return true
}
return true
case "/api/v1/status/active_queries":
statusActiveQueriesRequests.Inc()
promql.WriteActiveQueries(w)
return true
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case "/api/v1/export":
exportRequests.Inc()
if err := prometheus.ExportHandler(startTime, w, r); err != nil {
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exportErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
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return true
}
return true
case "/api/v1/export/csv":
exportCSVRequests.Inc()
if err := prometheus.ExportCSVHandler(startTime, w, r); err != nil {
exportCSVErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
return true
}
return true
case "/api/v1/export/native":
exportNativeRequests.Inc()
if err := prometheus.ExportNativeHandler(startTime, w, r); err != nil {
exportNativeErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
return true
}
return true
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case "/federate":
federateRequests.Inc()
if err := prometheus.FederateHandler(startTime, w, r); err != nil {
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federateErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
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return true
}
return true
case "/metrics/find", "/metrics/find/":
graphiteMetricsFindRequests.Inc()
httpserver.EnableCORS(w, r)
if err := graphite.MetricsFindHandler(startTime, w, r); err != nil {
graphiteMetricsFindErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
return true
}
return true
case "/metrics/expand", "/metrics/expand/":
graphiteMetricsExpandRequests.Inc()
httpserver.EnableCORS(w, r)
if err := graphite.MetricsExpandHandler(startTime, w, r); err != nil {
graphiteMetricsExpandErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
return true
}
return true
case "/metrics/index.json", "/metrics/index.json/":
graphiteMetricsIndexRequests.Inc()
httpserver.EnableCORS(w, r)
if err := graphite.MetricsIndexHandler(startTime, w, r); err != nil {
graphiteMetricsIndexErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
return true
}
return true
case "/tags/tagSeries":
graphiteTagsTagSeriesRequests.Inc()
if err := graphite.TagsTagSeriesHandler(startTime, w, r); err != nil {
graphiteTagsTagSeriesErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
return true
}
return true
case "/tags/tagMultiSeries":
graphiteTagsTagMultiSeriesRequests.Inc()
if err := graphite.TagsTagMultiSeriesHandler(startTime, w, r); err != nil {
graphiteTagsTagMultiSeriesErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
return true
}
return true
case "/tags":
graphiteTagsRequests.Inc()
if err := graphite.TagsHandler(startTime, w, r); err != nil {
graphiteTagsErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
return true
}
return true
case "/tags/findSeries":
graphiteTagsFindSeriesRequests.Inc()
if err := graphite.TagsFindSeriesHandler(startTime, w, r); err != nil {
graphiteTagsFindSeriesErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
return true
}
return true
case "/tags/autoComplete/tags":
graphiteTagsAutoCompleteTagsRequests.Inc()
httpserver.EnableCORS(w, r)
if err := graphite.TagsAutoCompleteTagsHandler(startTime, w, r); err != nil {
graphiteTagsAutoCompleteTagsErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
return true
}
return true
case "/tags/autoComplete/values":
graphiteTagsAutoCompleteValuesRequests.Inc()
httpserver.EnableCORS(w, r)
if err := graphite.TagsAutoCompleteValuesHandler(startTime, w, r); err != nil {
graphiteTagsAutoCompleteValuesErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
return true
}
return true
case "/tags/delSeries":
graphiteTagsDelSeriesRequests.Inc()
authKey := r.FormValue("authKey")
if authKey != *deleteAuthKey {
httpserver.Errorf(w, r, "invalid authKey %q. It must match the value from -deleteAuthKey command line flag", authKey)
return true
}
if err := graphite.TagsDelSeriesHandler(startTime, w, r); err != nil {
graphiteTagsDelSeriesErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
return true
}
return true
case "/api/v1/rules":
// Return dumb placeholder
rulesRequests.Inc()
w.Header().Set("Content-Type", "application/json; charset=utf-8")
fmt.Fprintf(w, "%s", `{"status":"success","data":{"groups":[]}}`)
return true
case "/api/v1/alerts":
// Return dumb placehloder
alertsRequests.Inc()
w.Header().Set("Content-Type", "application/json; charset=utf-8")
fmt.Fprintf(w, "%s", `{"status":"success","data":{"alerts":[]}}`)
return true
case "/api/v1/metadata":
// Return dumb placeholder
metadataRequests.Inc()
w.Header().Set("Content-Type", "application/json; charset=utf-8")
fmt.Fprintf(w, "%s", `{"status":"success","data":{}}`)
return true
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case "/api/v1/admin/tsdb/delete_series":
deleteRequests.Inc()
authKey := r.FormValue("authKey")
if authKey != *deleteAuthKey {
httpserver.Errorf(w, r, "invalid authKey %q. It must match the value from -deleteAuthKey command line flag", authKey)
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return true
}
if err := prometheus.DeleteHandler(startTime, r); err != nil {
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deleteErrors.Inc()
httpserver.Errorf(w, r, "error in %q: %s", r.URL.Path, err)
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return true
}
w.WriteHeader(http.StatusNoContent)
return true
default:
return false
}
}
func isGraphiteTagsPath(path string) bool {
switch path {
// See https://graphite.readthedocs.io/en/stable/tags.html for a list of Graphite Tags API paths.
// Do not include `/tags/<tag_name>` here, since this will fool the caller.
case "/tags/tagSeries", "/tags/tagMultiSeries", "/tags/findSeries",
"/tags/autoComplete/tags", "/tags/autoComplete/values", "/tags/delSeries":
return true
default:
return false
}
}
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func sendPrometheusError(w http.ResponseWriter, r *http.Request, err error) {
logger.Warnf("error in %q: %s", r.RequestURI, err)
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w.Header().Set("Content-Type", "application/json; charset=utf-8")
statusCode := http.StatusUnprocessableEntity
var esc *httpserver.ErrorWithStatusCode
if errors.As(err, &esc) {
statusCode = esc.StatusCode
}
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w.WriteHeader(statusCode)
prometheus.WriteErrorResponse(w, statusCode, err)
}
var (
labelValuesRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/label/{}/values"}`)
labelValuesErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/label/{}/values"}`)
queryRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/query"}`)
queryErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/query"}`)
queryRangeRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/query_range"}`)
queryRangeErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/query_range"}`)
seriesRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/series"}`)
seriesErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/series"}`)
seriesCountRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/series/count"}`)
seriesCountErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/series/count"}`)
labelsRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/labels"}`)
labelsErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/labels"}`)
labelsCountRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/labels/count"}`)
labelsCountErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/labels/count"}`)
topQueriesRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/status/top_queries"}`)
topQueriesErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/status/top_queries"}`)
statusTSDBRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/status/tsdb"}`)
statusTSDBErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/status/tsdb"}`)
statusActiveQueriesRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/status/active_queries"}`)
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deleteRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/admin/tsdb/delete_series"}`)
deleteErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/admin/tsdb/delete_series"}`)
exportRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/export"}`)
exportErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/export"}`)
exportCSVRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/export/csv"}`)
exportCSVErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/export/csv"}`)
exportNativeRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/export/native"}`)
exportNativeErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/export/native"}`)
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federateRequests = metrics.NewCounter(`vm_http_requests_total{path="/federate"}`)
federateErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/federate"}`)
graphiteMetricsFindRequests = metrics.NewCounter(`vm_http_requests_total{path="/metrics/find"}`)
graphiteMetricsFindErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/metrics/find"}`)
graphiteMetricsExpandRequests = metrics.NewCounter(`vm_http_requests_total{path="/metrics/expand"}`)
graphiteMetricsExpandErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/metrics/expand"}`)
graphiteMetricsIndexRequests = metrics.NewCounter(`vm_http_requests_total{path="/metrics/index.json"}`)
graphiteMetricsIndexErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/metrics/index.json"}`)
graphiteTagsTagSeriesRequests = metrics.NewCounter(`vm_http_requests_total{path="/tags/tagSeries"}`)
graphiteTagsTagSeriesErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/tags/tagSeries"}`)
graphiteTagsTagMultiSeriesRequests = metrics.NewCounter(`vm_http_requests_total{path="/tags/tagMultiSeries"}`)
graphiteTagsTagMultiSeriesErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/tags/tagMultiSeries"}`)
graphiteTagsRequests = metrics.NewCounter(`vm_http_requests_total{path="/tags"}`)
graphiteTagsErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/tags"}`)
graphiteTagValuesRequests = metrics.NewCounter(`vm_http_requests_total{path="/tags/<tag_name>"}`)
graphiteTagValuesErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/tags/<tag_name>"}`)
graphiteTagsFindSeriesRequests = metrics.NewCounter(`vm_http_requests_total{path="/tags/findSeries"}`)
graphiteTagsFindSeriesErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/tags/findSeries"}`)
graphiteTagsAutoCompleteTagsRequests = metrics.NewCounter(`vm_http_requests_total{path="/tags/autoComplete/tags"}`)
graphiteTagsAutoCompleteTagsErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/tags/autoComplete/tags"}`)
graphiteTagsAutoCompleteValuesRequests = metrics.NewCounter(`vm_http_requests_total{path="/tags/autoComplete/values"}`)
graphiteTagsAutoCompleteValuesErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/tags/autoComplete/values"}`)
graphiteTagsDelSeriesRequests = metrics.NewCounter(`vm_http_requests_total{path="/tags/delSeries"}`)
graphiteTagsDelSeriesErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/tags/delSeries"}`)
rulesRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/rules"}`)
alertsRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/alerts"}`)
metadataRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/metadata"}`)
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)