mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-21 07:56:26 +01:00
9e5e514faf
Previously the was a race condition when the background goroutine still could try collecting metrics
from already stopped resources after returning from pushmetrics.Stop().
Now the pushmetrics.Stop() waits until the background goroutine is stopped before returning.
This is a follow-up for https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5549
and the commit fe2d9f6646 .
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5548
469 lines
21 KiB
Go
469 lines
21 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"io"
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"net"
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"net/http"
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"os"
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"strings"
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"sync/atomic"
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"time"
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"github.com/VictoriaMetrics/metrics"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/clusternative"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/csvimport"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/datadogv1"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/datadogv2"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/graphite"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/influx"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/native"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/netstorage"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/newrelic"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/opentelemetry"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/opentsdb"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/opentsdbhttp"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/prometheusimport"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/promremotewrite"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/relabel"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vminsert/vmimport"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/auth"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/buildinfo"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/envflag"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
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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/influxutils"
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clusternativeserver "github.com/VictoriaMetrics/VictoriaMetrics/lib/ingestserver/clusternative"
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graphiteserver "github.com/VictoriaMetrics/VictoriaMetrics/lib/ingestserver/graphite"
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influxserver "github.com/VictoriaMetrics/VictoriaMetrics/lib/ingestserver/influx"
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opentsdbserver "github.com/VictoriaMetrics/VictoriaMetrics/lib/ingestserver/opentsdb"
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opentsdbhttpserver "github.com/VictoriaMetrics/VictoriaMetrics/lib/ingestserver/opentsdbhttp"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/procutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/common"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/pushmetrics"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/storage"
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)
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var (
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clusternativeListenAddr = flag.String("clusternativeListenAddr", "", "TCP address to listen for data from other vminsert nodes in multi-level cluster setup. "+
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"See https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#multi-level-cluster-setup . Usually :8400 should be set to match default vmstorage port for vminsert. Disabled work if empty")
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graphiteListenAddr = flag.String("graphiteListenAddr", "", "TCP and UDP address to listen for Graphite plaintext data. Usually :2003 must be set. Doesn't work if empty. "+
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"See also -graphiteListenAddr.useProxyProtocol")
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graphiteUseProxyProtocol = flag.Bool("graphiteListenAddr.useProxyProtocol", false, "Whether to use proxy protocol for connections accepted at -graphiteListenAddr . "+
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"See https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt")
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influxListenAddr = flag.String("influxListenAddr", "", "TCP and UDP address to listen for InfluxDB line protocol data. Usually :8089 must be set. Doesn't work if empty. "+
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"This flag isn't needed when ingesting data over HTTP - just send it to http://<victoriametrics>:8428/write . "+
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"See also -influxListenAddr.useProxyProtocol")
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influxUseProxyProtocol = flag.Bool("influxListenAddr.useProxyProtocol", false, "Whether to use proxy protocol for connections accepted at -influxListenAddr . "+
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"See https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt")
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opentsdbListenAddr = flag.String("opentsdbListenAddr", "", "TCP and UDP address to listen for OpenTSDB metrics. "+
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"Telnet put messages and HTTP /api/put messages are simultaneously served on TCP port. "+
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"Usually :4242 must be set. Doesn't work if empty. "+
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"See also -opentsdbListenAddr.useProxyProtocol")
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opentsdbUseProxyProtocol = flag.Bool("opentsdbListenAddr.useProxyProtocol", false, "Whether to use proxy protocol for connections accepted at -opentsdbListenAddr . "+
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"See https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt")
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opentsdbHTTPListenAddr = flag.String("opentsdbHTTPListenAddr", "", "TCP address to listen for OpenTSDB HTTP put requests. Usually :4242 must be set. Doesn't work if empty. "+
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"See also -opentsdbHTTPListenAddr.useProxyProtocol")
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opentsdbHTTPUseProxyProtocol = flag.Bool("opentsdbHTTPListenAddr.useProxyProtocol", false, "Whether to use proxy protocol for connections accepted "+
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"at -opentsdbHTTPListenAddr . See https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt")
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httpListenAddr = flag.String("httpListenAddr", ":8480", "Address to listen for http connections. See also -httpListenAddr.useProxyProtocol")
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useProxyProtocol = flag.Bool("httpListenAddr.useProxyProtocol", false, "Whether to use proxy protocol for connections accepted at -httpListenAddr . "+
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"See https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt . "+
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"With enabled proxy protocol http server cannot serve regular /metrics endpoint. Use -pushmetrics.url for metrics pushing")
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maxLabelsPerTimeseries = flag.Int("maxLabelsPerTimeseries", 30, "The maximum number of labels accepted per time series. Superfluous labels are dropped. In this case the vm_metrics_with_dropped_labels_total metric at /metrics page is incremented")
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maxLabelValueLen = flag.Int("maxLabelValueLen", 16*1024, "The maximum length of label values in the accepted time series. Longer label values are truncated. In this case the vm_too_long_label_values_total metric at /metrics page is incremented")
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storageNodes = flagutil.NewArrayString("storageNode", "Comma-separated addresses of vmstorage nodes; usage: -storageNode=vmstorage-host1,...,vmstorage-hostN . "+
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"Enterprise version of VictoriaMetrics supports automatic discovery of vmstorage addresses via dns+srv records. For example, -storageNode=dns+srv:vmstorage.addrs . "+
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"See https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#automatic-vmstorage-discovery")
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)
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var (
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clusternativeServer *clusternativeserver.Server
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graphiteServer *graphiteserver.Server
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influxServer *influxserver.Server
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opentsdbServer *opentsdbserver.Server
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opentsdbhttpServer *opentsdbhttpserver.Server
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)
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func main() {
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// Write flags and help message to stdout, since it is easier to grep or pipe.
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flag.CommandLine.SetOutput(os.Stdout)
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flag.Usage = usage
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envflag.Parse()
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buildinfo.Init()
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logger.Init()
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logger.Infof("initializing netstorage for storageNodes %s...", *storageNodes)
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startTime := time.Now()
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if len(*storageNodes) == 0 {
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logger.Fatalf("missing -storageNode arg")
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}
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if hasEmptyValues(*storageNodes) {
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logger.Fatalf("found empty address of storage node in the -storageNodes flag, please make sure that all -storageNode args are non-empty")
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}
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if duplicatedAddr := checkDuplicates(*storageNodes); duplicatedAddr != "" {
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logger.Fatalf("found equal addresses of storage nodes in the -storageNodes flag: %q", duplicatedAddr)
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}
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hashSeed := uint64(0)
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if *clusternativeListenAddr != "" {
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// Use different hash seed for the second level of vminsert nodes in multi-level cluster setup.
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// This should fix uneven distribution of time series among storage nodes.
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// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1672
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hashSeed = 0xabcdef0123456789
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}
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netstorage.Init(*storageNodes, hashSeed)
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logger.Infof("successfully initialized netstorage in %.3f seconds", time.Since(startTime).Seconds())
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relabel.Init()
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storage.SetMaxLabelsPerTimeseries(*maxLabelsPerTimeseries)
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storage.SetMaxLabelValueLen(*maxLabelValueLen)
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common.StartUnmarshalWorkers()
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if len(*clusternativeListenAddr) > 0 {
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clusternativeServer = clusternativeserver.MustStart(*clusternativeListenAddr, func(c net.Conn) error {
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return clusternative.InsertHandler(c)
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})
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}
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if len(*graphiteListenAddr) > 0 {
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graphiteServer = graphiteserver.MustStart(*graphiteListenAddr, *graphiteUseProxyProtocol, func(r io.Reader) error {
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return graphite.InsertHandler(nil, r)
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})
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}
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if len(*influxListenAddr) > 0 {
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influxServer = influxserver.MustStart(*influxListenAddr, *influxUseProxyProtocol, func(r io.Reader) error {
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return influx.InsertHandlerForReader(nil, r)
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})
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}
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if len(*opentsdbListenAddr) > 0 {
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opentsdbServer = opentsdbserver.MustStart(*opentsdbListenAddr, *opentsdbUseProxyProtocol, func(r io.Reader) error {
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return opentsdb.InsertHandler(nil, r)
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}, opentsdbhttp.InsertHandler)
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}
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if len(*opentsdbHTTPListenAddr) > 0 {
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opentsdbhttpServer = opentsdbhttpserver.MustStart(*opentsdbHTTPListenAddr, *opentsdbHTTPUseProxyProtocol, opentsdbhttp.InsertHandler)
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}
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go func() {
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httpserver.Serve(*httpListenAddr, *useProxyProtocol, requestHandler)
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}()
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pushmetrics.Init()
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sig := procutil.WaitForSigterm()
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logger.Infof("service received signal %s", sig)
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pushmetrics.Stop()
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logger.Infof("gracefully shutting down http service at %q", *httpListenAddr)
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startTime = time.Now()
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if err := httpserver.Stop(*httpListenAddr); err != nil {
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logger.Fatalf("cannot stop http service: %s", err)
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}
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logger.Infof("successfully shut down http service in %.3f seconds", time.Since(startTime).Seconds())
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if len(*clusternativeListenAddr) > 0 {
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clusternativeServer.MustStop()
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}
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if len(*graphiteListenAddr) > 0 {
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graphiteServer.MustStop()
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}
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if len(*influxListenAddr) > 0 {
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influxServer.MustStop()
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}
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if len(*opentsdbListenAddr) > 0 {
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opentsdbServer.MustStop()
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}
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if len(*opentsdbHTTPListenAddr) > 0 {
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opentsdbhttpServer.MustStop()
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}
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common.StopUnmarshalWorkers()
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logger.Infof("shutting down neststorage...")
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startTime = time.Now()
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netstorage.MustStop()
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logger.Infof("successfully stopped netstorage in %.3f seconds", time.Since(startTime).Seconds())
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fs.MustStopDirRemover()
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logger.Infof("the vminsert has been stopped")
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}
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func requestHandler(w http.ResponseWriter, r *http.Request) bool {
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startTime := time.Now()
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defer requestDuration.UpdateDuration(startTime)
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if r.URL.Path == "/" {
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if r.Method != http.MethodGet {
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return false
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}
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w.Header().Add("Content-Type", "text/html; charset=utf-8")
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fmt.Fprintf(w, `vminsert - a component of VictoriaMetrics cluster<br/>
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<a href="https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html">docs</a><br>
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`)
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return true
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}
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p, err := httpserver.ParsePath(r.URL.Path)
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if err != nil {
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httpserver.Errorf(w, r, "cannot parse path %q: %s", r.URL.Path, err)
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return true
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}
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if p.Prefix != "insert" {
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// This is not our link.
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return false
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}
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at, err := auth.NewTokenPossibleMultitenant(p.AuthToken)
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if err != nil {
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httpserver.Errorf(w, r, "auth error: %s", err)
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return true
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}
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if strings.HasPrefix(p.Suffix, "prometheus/api/v1/import/prometheus") {
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prometheusimportRequests.Inc()
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if err := prometheusimport.InsertHandler(at, r); err != nil {
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prometheusimportErrors.Inc()
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httpserver.Errorf(w, r, "%s", err)
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return true
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}
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statusCode := http.StatusNoContent
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if strings.HasPrefix(p.Suffix, "prometheus/api/v1/import/prometheus/metrics/job/") {
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// Return 200 status code for pushgateway requests.
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// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3636
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statusCode = http.StatusOK
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}
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w.WriteHeader(statusCode)
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return true
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}
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if strings.HasPrefix(p.Suffix, "datadog/") {
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// Trim suffix from paths starting from /datadog/ in order to support legacy DataDog agent.
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// See https://github.com/VictoriaMetrics/VictoriaMetrics/pull/2670
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p.Suffix = strings.TrimSuffix(p.Suffix, "/")
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}
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switch p.Suffix {
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case "prometheus/", "prometheus", "prometheus/api/v1/write":
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if common.HandleVMProtoServerHandshake(w, r) {
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return true
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}
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prometheusWriteRequests.Inc()
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if err := promremotewrite.InsertHandler(at, r); err != nil {
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prometheusWriteErrors.Inc()
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httpserver.Errorf(w, r, "%s", 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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case "prometheus/api/v1/import":
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vmimportRequests.Inc()
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if err := vmimport.InsertHandler(at, r); err != nil {
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vmimportErrors.Inc()
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httpserver.Errorf(w, r, "%s", 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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case "prometheus/api/v1/import/csv":
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csvimportRequests.Inc()
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if err := csvimport.InsertHandler(at, r); err != nil {
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csvimportErrors.Inc()
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httpserver.Errorf(w, r, "%s", 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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case "prometheus/api/v1/import/native":
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nativeimportRequests.Inc()
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if err := native.InsertHandler(at, r); err != nil {
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nativeimportErrors.Inc()
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httpserver.Errorf(w, r, "%s", 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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case "influx/write", "influx/api/v2/write":
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influxWriteRequests.Inc()
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addInfluxResponseHeaders(w)
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if err := influx.InsertHandlerForHTTP(at, r); err != nil {
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influxWriteErrors.Inc()
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httpserver.Errorf(w, r, "%s", 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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case "influx/query":
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influxQueryRequests.Inc()
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addInfluxResponseHeaders(w)
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influxutils.WriteDatabaseNames(w)
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return true
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case "opentelemetry/api/v1/push":
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opentelemetryPushRequests.Inc()
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if err := opentelemetry.InsertHandler(at, r); err != nil {
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opentelemetryPushErrors.Inc()
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httpserver.Errorf(w, r, "%s", err)
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return true
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}
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w.WriteHeader(http.StatusOK)
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return true
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case "newrelic":
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newrelicCheckRequest.Inc()
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(202)
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fmt.Fprintf(w, `{"status":"ok"}`)
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return true
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case "newrelic/inventory/deltas":
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newrelicInventoryRequests.Inc()
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(202)
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fmt.Fprintf(w, `{"payload":{"version": 1, "state": {}, "reset": "false"}}`)
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return true
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case "newrelic/infra/v2/metrics/events/bulk":
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newrelicWriteRequests.Inc()
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if err := newrelic.InsertHandlerForHTTP(at, r); err != nil {
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newrelicWriteErrors.Inc()
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httpserver.Errorf(w, r, "%s", err)
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return true
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}
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(202)
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fmt.Fprintf(w, `{"status":"ok"}`)
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return true
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case "datadog/api/v1/series":
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datadogv1WriteRequests.Inc()
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if err := datadogv1.InsertHandlerForHTTP(at, r); err != nil {
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datadogv1WriteErrors.Inc()
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httpserver.Errorf(w, r, "%s", err)
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return true
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}
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(202)
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fmt.Fprintf(w, `{"status":"ok"}`)
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return true
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case "datadog/api/v2/series":
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datadogv2WriteRequests.Inc()
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if err := datadogv2.InsertHandlerForHTTP(at, r); err != nil {
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datadogv2WriteErrors.Inc()
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httpserver.Errorf(w, r, "%s", err)
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return true
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}
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// See https://docs.datadoghq.com/api/latest/metrics/#submit-metrics
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(202)
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fmt.Fprintf(w, `{"status":"ok"}`)
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return true
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case "datadog/api/v1/validate":
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datadogValidateRequests.Inc()
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// See https://docs.datadoghq.com/api/latest/authentication/#validate-api-key
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w.Header().Set("Content-Type", "application/json")
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fmt.Fprintf(w, `{"valid":true}`)
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return true
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case "datadog/api/v1/check_run":
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datadogCheckRunRequests.Inc()
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// See https://docs.datadoghq.com/api/latest/service-checks/#submit-a-service-check
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(202)
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fmt.Fprintf(w, `{"status":"ok"}`)
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return true
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case "datadog/intake":
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datadogIntakeRequests.Inc()
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w.Header().Set("Content-Type", "application/json")
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fmt.Fprintf(w, `{}`)
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return true
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case "datadog/api/v1/metadata":
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datadogMetadataRequests.Inc()
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w.Header().Set("Content-Type", "application/json")
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fmt.Fprintf(w, `{}`)
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return true
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default:
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// This is not our link
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return false
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}
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}
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func addInfluxResponseHeaders(w http.ResponseWriter) {
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// This is needed for some clients, which expect InfluxDB version header.
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// See, for example, https://github.com/ntop/ntopng/issues/5449#issuecomment-1005347597
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w.Header().Set("X-Influxdb-Version", "1.8.0")
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}
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var (
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requestDuration = metrics.NewHistogram(`vminsert_request_duration_seconds`)
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prometheusWriteRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/prometheus/", protocol="promremotewrite"}`)
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prometheusWriteErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/prometheus/", protocol="promremotewrite"}`)
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vmimportRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/prometheus/api/v1/import", protocol="vmimport"}`)
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vmimportErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/prometheus/api/v1/import", protocol="vmimport"}`)
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csvimportRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/prometheus/api/v1/import/csv", protocol="csvimport"}`)
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csvimportErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/prometheus/api/v1/import/csv", protocol="csvimport"}`)
|
|
|
|
prometheusimportRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/prometheus/api/v1/import/prometheus", protocol="prometheusimport"}`)
|
|
prometheusimportErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/prometheus/api/v1/import/prometheus", protocol="prometheusimport"}`)
|
|
|
|
nativeimportRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/prometheus/api/v1/import/native", protocol="nativeimport"}`)
|
|
nativeimportErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/prometheus/api/v1/import/native", protocol="nativeimport"}`)
|
|
|
|
influxWriteRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/influx/write", protocol="influx"}`)
|
|
influxWriteErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/influx/write", protocol="influx"}`)
|
|
|
|
influxQueryRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/influx/query", protocol="influx"}`)
|
|
|
|
opentelemetryPushRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/opentelemetry/api/v1/push", protocol="opentelemetry"}`)
|
|
opentelemetryPushErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/opentelemetry/api/v1/push", protocol="opentelemetry"}`)
|
|
|
|
newrelicWriteRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/newrelic/infra/v2/metrics/events/bulk", protocol="newrelic"}`)
|
|
newrelicWriteErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/newrelic/infra/v2/metrics/events/bulk", protocol="newrelic"}`)
|
|
|
|
newrelicInventoryRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/newrelic/inventory/deltas", protocol="newrelic"}`)
|
|
newrelicCheckRequest = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/newrelic", protocol="newrelic"}`)
|
|
|
|
datadogv1WriteRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/datadog/api/v1/series", protocol="datadog"}`)
|
|
datadogv1WriteErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/datadog/api/v1/series", protocol="datadog"}`)
|
|
|
|
datadogv2WriteRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/datadog/api/v2/series", protocol="datadog"}`)
|
|
datadogv2WriteErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/insert/{}/datadog/api/v2/series", protocol="datadog"}`)
|
|
|
|
datadogValidateRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/datadog/api/v1/validate", protocol="datadog"}`)
|
|
datadogCheckRunRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/datadog/api/v1/check_run", protocol="datadog"}`)
|
|
datadogIntakeRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/datadog/intake", protocol="datadog"}`)
|
|
datadogMetadataRequests = metrics.NewCounter(`vm_http_requests_total{path="/insert/{}/datadog/api/v1/metadata", protocol="datadog"}`)
|
|
|
|
_ = metrics.NewGauge(`vm_metrics_with_dropped_labels_total`, func() float64 {
|
|
return float64(atomic.LoadUint64(&storage.MetricsWithDroppedLabels))
|
|
})
|
|
_ = metrics.NewGauge(`vm_too_long_label_names_total`, func() float64 {
|
|
return float64(atomic.LoadUint64(&storage.TooLongLabelNames))
|
|
})
|
|
_ = metrics.NewGauge(`vm_too_long_label_values_total`, func() float64 {
|
|
return float64(atomic.LoadUint64(&storage.TooLongLabelValues))
|
|
})
|
|
)
|
|
|
|
func usage() {
|
|
const s = `
|
|
vminsert accepts data via popular data ingestion protocols and routes it to vmstorage nodes configured via -storageNode.
|
|
|
|
See the docs at https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html .
|
|
`
|
|
flagutil.Usage(s)
|
|
}
|
|
|
|
func checkDuplicates(arr []string) string {
|
|
visited := make(map[string]struct{})
|
|
for _, s := range arr {
|
|
if _, ok := visited[s]; ok {
|
|
return s
|
|
}
|
|
visited[s] = struct{}{}
|
|
}
|
|
return ""
|
|
}
|
|
|
|
func hasEmptyValues(arr []string) bool {
|
|
for _, s := range arr {
|
|
if s == "" {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|