mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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263 lines
8.9 KiB
Go
263 lines
8.9 KiB
Go
package vmselect
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import (
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"flag"
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"fmt"
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"net/http"
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"runtime"
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"strings"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmselect/netstorage"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmselect/prometheus"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmselect/promql"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmstorage"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/fs"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/httpserver"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/timerpool"
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"github.com/VictoriaMetrics/metrics"
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)
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var (
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deleteAuthKey = flag.String("deleteAuthKey", "", "authKey for metrics' deletion via /api/v1/admin/tsdb/delete_series")
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maxConcurrentRequests = flag.Int("search.maxConcurrentRequests", getDefaultMaxConcurrentRequests(), "The maximum number of concurrent search requests. "+
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"It shouldn't be high, since a single request can saturate all the CPU cores. See also `-search.maxQueueDuration`")
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maxQueueDuration = flag.Duration("search.maxQueueDuration", 10*time.Second, "The maximum time the request waits for execution when `-search.maxConcurrentRequests` limit is reached")
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)
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func getDefaultMaxConcurrentRequests() int {
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n := runtime.GOMAXPROCS(-1)
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if n <= 4 {
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n *= 2
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}
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if n > 16 {
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// A single request can saturate all the CPU cores, so there is no sense
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// in allowing higher number of concurrent requests - they will just contend
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// for unavailable CPU time.
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n = 16
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}
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return n
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}
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// Init initializes vmselect
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func Init() {
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tmpDirPath := *vmstorage.DataPath + "/tmp"
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fs.RemoveDirContents(tmpDirPath)
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netstorage.InitTmpBlocksDir(tmpDirPath)
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promql.InitRollupResultCache(*vmstorage.DataPath + "/cache/rollupResult")
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concurrencyCh = make(chan struct{}, *maxConcurrentRequests)
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}
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// Stop stops vmselect
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func Stop() {
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promql.StopRollupResultCache()
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}
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var concurrencyCh chan struct{}
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var (
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concurrencyLimitReached = metrics.NewCounter(`vm_concurrent_select_limit_reached_total`)
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concurrencyLimitTimeout = metrics.NewCounter(`vm_concurrent_select_limit_timeout_total`)
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_ = metrics.NewGauge(`vm_concurrent_select_capacity`, func() float64 {
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return float64(cap(concurrencyCh))
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})
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_ = metrics.NewGauge(`vm_concurrent_select_current`, func() float64 {
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return float64(len(concurrencyCh))
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})
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)
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// RequestHandler handles remote read API requests for Prometheus
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func RequestHandler(w http.ResponseWriter, r *http.Request) bool {
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// Limit the number of concurrent queries.
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select {
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case concurrencyCh <- struct{}{}:
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defer func() { <-concurrencyCh }()
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default:
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// Sleep for a while until giving up. This should resolve short bursts in requests.
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concurrencyLimitReached.Inc()
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t := timerpool.Get(*maxQueueDuration)
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select {
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case concurrencyCh <- struct{}{}:
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timerpool.Put(t)
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defer func() { <-concurrencyCh }()
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case <-t.C:
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timerpool.Put(t)
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concurrencyLimitTimeout.Inc()
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err := &httpserver.ErrorWithStatusCode{
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Err: fmt.Errorf("cannot handle more than %d concurrent search requests during %s; possible solutions: "+
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"increase `-search.maxQueueDuration`, increase `-search.maxConcurrentRequests`, increase server capacity",
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*maxConcurrentRequests, *maxQueueDuration),
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StatusCode: http.StatusServiceUnavailable,
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}
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httpserver.Errorf(w, "%s", err)
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return true
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}
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}
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path := strings.Replace(r.URL.Path, "//", "/", -1)
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if strings.HasPrefix(path, "/api/v1/label/") {
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s := r.URL.Path[len("/api/v1/label/"):]
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if strings.HasSuffix(s, "/values") {
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labelValuesRequests.Inc()
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labelName := s[:len(s)-len("/values")]
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httpserver.EnableCORS(w, r)
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if err := prometheus.LabelValuesHandler(labelName, w, r); err != nil {
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labelValuesErrors.Inc()
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sendPrometheusError(w, r, err)
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return true
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}
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return true
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}
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}
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switch path {
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case "/api/v1/query":
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queryRequests.Inc()
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httpserver.EnableCORS(w, r)
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if err := prometheus.QueryHandler(w, r); err != nil {
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queryErrors.Inc()
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sendPrometheusError(w, r, err)
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return true
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}
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return true
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case "/api/v1/query_range":
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queryRangeRequests.Inc()
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httpserver.EnableCORS(w, r)
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if err := prometheus.QueryRangeHandler(w, r); err != nil {
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queryRangeErrors.Inc()
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sendPrometheusError(w, r, err)
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return true
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}
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return true
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case "/api/v1/series":
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seriesRequests.Inc()
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httpserver.EnableCORS(w, r)
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if err := prometheus.SeriesHandler(w, r); err != nil {
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seriesErrors.Inc()
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sendPrometheusError(w, r, err)
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return true
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}
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return true
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case "/api/v1/series/count":
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seriesCountRequests.Inc()
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httpserver.EnableCORS(w, r)
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if err := prometheus.SeriesCountHandler(w, r); err != nil {
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seriesCountErrors.Inc()
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sendPrometheusError(w, r, err)
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return true
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}
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return true
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case "/api/v1/labels":
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labelsRequests.Inc()
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httpserver.EnableCORS(w, r)
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if err := prometheus.LabelsHandler(w, r); err != nil {
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labelsErrors.Inc()
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sendPrometheusError(w, r, err)
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return true
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}
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return true
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case "/api/v1/labels/count":
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labelsCountRequests.Inc()
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httpserver.EnableCORS(w, r)
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if err := prometheus.LabelsCountHandler(w, r); err != nil {
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labelsCountErrors.Inc()
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sendPrometheusError(w, r, err)
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return true
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}
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return true
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case "/api/v1/export":
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exportRequests.Inc()
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if err := prometheus.ExportHandler(w, r); err != nil {
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exportErrors.Inc()
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httpserver.Errorf(w, "error in %q: %s", r.URL.Path, err)
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return true
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}
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return true
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case "/federate":
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federateRequests.Inc()
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if err := prometheus.FederateHandler(w, r); err != nil {
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federateErrors.Inc()
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httpserver.Errorf(w, "error int %q: %s", r.URL.Path, err)
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return true
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}
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return true
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case "/api/v1/rules":
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// Return dumb placeholder
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rulesRequests.Inc()
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w.Header().Set("Content-Type", "application/json")
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fmt.Fprintf(w, "%s", `{"status":"success","data":{"groups":[]}}`)
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return true
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case "/api/v1/alerts":
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// Return dumb placehloder
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alertsRequests.Inc()
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w.Header().Set("Content-Type", "application/json")
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fmt.Fprintf(w, "%s", `{"status":"success","data":{"alerts":[]}}`)
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return true
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case "/api/v1/admin/tsdb/delete_series":
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deleteRequests.Inc()
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authKey := r.FormValue("authKey")
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if authKey != *deleteAuthKey {
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httpserver.Errorf(w, "invalid authKey %q. It must match the value from -deleteAuthKey command line flag", authKey)
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return true
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}
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if err := prometheus.DeleteHandler(r); err != nil {
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deleteErrors.Inc()
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httpserver.Errorf(w, "error in %q: %s", r.URL.Path, err)
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return true
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}
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w.WriteHeader(http.StatusNoContent)
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return true
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default:
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return false
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}
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}
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func sendPrometheusError(w http.ResponseWriter, r *http.Request, err error) {
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logger.Errorf("error in %q: %s", r.RequestURI, err)
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w.Header().Set("Content-Type", "application/json")
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statusCode := http.StatusUnprocessableEntity
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if esc, ok := err.(*httpserver.ErrorWithStatusCode); ok {
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statusCode = esc.StatusCode
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}
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w.WriteHeader(statusCode)
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prometheus.WriteErrorResponse(w, statusCode, err)
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}
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var (
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labelValuesRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/label/{}/values"}`)
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labelValuesErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/label/{}/values"}`)
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queryRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/query"}`)
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queryErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/query"}`)
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queryRangeRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/query_range"}`)
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queryRangeErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/query_range"}`)
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seriesRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/series"}`)
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seriesErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/series"}`)
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seriesCountRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/series/count"}`)
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seriesCountErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/series/count"}`)
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labelsRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/labels"}`)
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labelsErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/labels"}`)
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labelsCountRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/labels/count"}`)
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labelsCountErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/labels/count"}`)
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deleteRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/admin/tsdb/delete_series"}`)
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deleteErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/admin/tsdb/delete_series"}`)
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exportRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/export"}`)
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exportErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/api/v1/export"}`)
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federateRequests = metrics.NewCounter(`vm_http_requests_total{path="/federate"}`)
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federateErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/federate"}`)
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rulesRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/rules"}`)
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alertsRequests = metrics.NewCounter(`vm_http_requests_total{path="/api/v1/alerts"}`)
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)
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