mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-26 20:30:10 +01:00
524 lines
21 KiB
Go
524 lines
21 KiB
Go
package remotewrite
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"strings"
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"sync"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/awsapi"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/persistentqueue"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/common"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/timerpool"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/timeutil"
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"github.com/VictoriaMetrics/metrics"
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)
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var (
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forcePromProto = flagutil.NewArrayBool("remoteWrite.forcePromProto", "Whether to force Prometheus remote write protocol for sending data "+
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"to the corresponding -remoteWrite.url . See https://docs.victoriametrics.com/vmagent.html#victoriametrics-remote-write-protocol")
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forceVMProto = flagutil.NewArrayBool("remoteWrite.forceVMProto", "Whether to force VictoriaMetrics remote write protocol for sending data "+
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"to the corresponding -remoteWrite.url . See https://docs.victoriametrics.com/vmagent.html#victoriametrics-remote-write-protocol")
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rateLimit = flagutil.NewArrayInt("remoteWrite.rateLimit", 0, "Optional rate limit in bytes per second for data sent to the corresponding -remoteWrite.url. "+
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"By default, the rate limit is disabled. It can be useful for limiting load on remote storage when big amounts of buffered data "+
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"is sent after temporary unavailability of the remote storage")
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sendTimeout = flagutil.NewArrayDuration("remoteWrite.sendTimeout", time.Minute, "Timeout for sending a single block of data to the corresponding -remoteWrite.url")
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proxyURL = flagutil.NewArrayString("remoteWrite.proxyURL", "Optional proxy URL for writing data to the corresponding -remoteWrite.url. "+
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"Supported proxies: http, https, socks5. Example: -remoteWrite.proxyURL=socks5://proxy:1234")
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tlsHandshakeTimeout = flagutil.NewArrayDuration("remoteWrite.tlsHandshakeTimeout", 20*time.Second, "The timeout for estabilishing tls connections to the corresponding -remoteWrite.url")
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tlsInsecureSkipVerify = flagutil.NewArrayBool("remoteWrite.tlsInsecureSkipVerify", "Whether to skip tls verification when connecting to the corresponding -remoteWrite.url")
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tlsCertFile = flagutil.NewArrayString("remoteWrite.tlsCertFile", "Optional path to client-side TLS certificate file to use when connecting "+
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"to the corresponding -remoteWrite.url")
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tlsKeyFile = flagutil.NewArrayString("remoteWrite.tlsKeyFile", "Optional path to client-side TLS certificate key to use when connecting to the corresponding -remoteWrite.url")
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tlsCAFile = flagutil.NewArrayString("remoteWrite.tlsCAFile", "Optional path to TLS CA file to use for verifying connections to the corresponding -remoteWrite.url. "+
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"By default, system CA is used")
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tlsServerName = flagutil.NewArrayString("remoteWrite.tlsServerName", "Optional TLS server name to use for connections to the corresponding -remoteWrite.url. "+
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"By default, the server name from -remoteWrite.url is used")
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headers = flagutil.NewArrayString("remoteWrite.headers", "Optional HTTP headers to send with each request to the corresponding -remoteWrite.url. "+
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"For example, -remoteWrite.headers='My-Auth:foobar' would send 'My-Auth: foobar' HTTP header with every request to the corresponding -remoteWrite.url. "+
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"Multiple headers must be delimited by '^^': -remoteWrite.headers='header1:value1^^header2:value2'")
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basicAuthUsername = flagutil.NewArrayString("remoteWrite.basicAuth.username", "Optional basic auth username to use for the corresponding -remoteWrite.url")
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basicAuthPassword = flagutil.NewArrayString("remoteWrite.basicAuth.password", "Optional basic auth password to use for the corresponding -remoteWrite.url")
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basicAuthPasswordFile = flagutil.NewArrayString("remoteWrite.basicAuth.passwordFile", "Optional path to basic auth password to use for the corresponding -remoteWrite.url. "+
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"The file is re-read every second")
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bearerToken = flagutil.NewArrayString("remoteWrite.bearerToken", "Optional bearer auth token to use for the corresponding -remoteWrite.url")
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bearerTokenFile = flagutil.NewArrayString("remoteWrite.bearerTokenFile", "Optional path to bearer token file to use for the corresponding -remoteWrite.url. "+
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"The token is re-read from the file every second")
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oauth2ClientID = flagutil.NewArrayString("remoteWrite.oauth2.clientID", "Optional OAuth2 clientID to use for the corresponding -remoteWrite.url")
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oauth2ClientSecret = flagutil.NewArrayString("remoteWrite.oauth2.clientSecret", "Optional OAuth2 clientSecret to use for the corresponding -remoteWrite.url")
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oauth2ClientSecretFile = flagutil.NewArrayString("remoteWrite.oauth2.clientSecretFile", "Optional OAuth2 clientSecretFile to use for the corresponding -remoteWrite.url")
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oauth2EndpointParams = flagutil.NewArrayString("remoteWrite.oauth2.endpointParams", "Optional OAuth2 endpoint parameters to use for the corresponding -remoteWrite.url . "+
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`The endpoint parameters must be set in JSON format: {"param1":"value1",...,"paramN":"valueN"}`)
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oauth2TokenURL = flagutil.NewArrayString("remoteWrite.oauth2.tokenUrl", "Optional OAuth2 tokenURL to use for the corresponding -remoteWrite.url")
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oauth2Scopes = flagutil.NewArrayString("remoteWrite.oauth2.scopes", "Optional OAuth2 scopes to use for the corresponding -remoteWrite.url. Scopes must be delimited by ';'")
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awsUseSigv4 = flagutil.NewArrayBool("remoteWrite.aws.useSigv4", "Enables SigV4 request signing for the corresponding -remoteWrite.url. "+
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"It is expected that other -remoteWrite.aws.* command-line flags are set if sigv4 request signing is enabled")
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awsEC2Endpoint = flagutil.NewArrayString("remoteWrite.aws.ec2Endpoint", "Optional AWS EC2 API endpoint to use for the corresponding -remoteWrite.url if -remoteWrite.aws.useSigv4 is set")
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awsSTSEndpoint = flagutil.NewArrayString("remoteWrite.aws.stsEndpoint", "Optional AWS STS API endpoint to use for the corresponding -remoteWrite.url if -remoteWrite.aws.useSigv4 is set")
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awsRegion = flagutil.NewArrayString("remoteWrite.aws.region", "Optional AWS region to use for the corresponding -remoteWrite.url if -remoteWrite.aws.useSigv4 is set")
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awsRoleARN = flagutil.NewArrayString("remoteWrite.aws.roleARN", "Optional AWS roleARN to use for the corresponding -remoteWrite.url if -remoteWrite.aws.useSigv4 is set")
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awsAccessKey = flagutil.NewArrayString("remoteWrite.aws.accessKey", "Optional AWS AccessKey to use for the corresponding -remoteWrite.url if -remoteWrite.aws.useSigv4 is set")
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awsService = flagutil.NewArrayString("remoteWrite.aws.service", "Optional AWS Service to use for the corresponding -remoteWrite.url if -remoteWrite.aws.useSigv4 is set. "+
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"Defaults to \"aps\"")
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awsSecretKey = flagutil.NewArrayString("remoteWrite.aws.secretKey", "Optional AWS SecretKey to use for the corresponding -remoteWrite.url if -remoteWrite.aws.useSigv4 is set")
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)
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type client struct {
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sanitizedURL string
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remoteWriteURL string
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// Whether to use VictoriaMetrics remote write protocol for sending the data to remoteWriteURL
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useVMProto bool
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fq *persistentqueue.FastQueue
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hc *http.Client
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sendBlock func(block []byte) bool
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authCfg *promauth.Config
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awsCfg *awsapi.Config
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rl rateLimiter
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bytesSent *metrics.Counter
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blocksSent *metrics.Counter
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requestDuration *metrics.Histogram
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requestsOKCount *metrics.Counter
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errorsCount *metrics.Counter
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packetsDropped *metrics.Counter
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rateLimit *metrics.Gauge
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retriesCount *metrics.Counter
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sendDuration *metrics.FloatCounter
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wg sync.WaitGroup
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stopCh chan struct{}
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}
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func newHTTPClient(argIdx int, remoteWriteURL, sanitizedURL string, fq *persistentqueue.FastQueue, concurrency int) *client {
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authCfg, err := getAuthConfig(argIdx)
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if err != nil {
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logger.Fatalf("cannot initialize auth config for -remoteWrite.url=%q: %s", remoteWriteURL, err)
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}
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tlsCfg, err := authCfg.NewTLSConfig()
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if err != nil {
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logger.Fatalf("cannot initialize tls config for -remoteWrite.url=%q: %s", remoteWriteURL, err)
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}
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awsCfg, err := getAWSAPIConfig(argIdx)
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if err != nil {
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logger.Fatalf("cannot initialize AWS Config for -remoteWrite.url=%q: %s", remoteWriteURL, err)
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}
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tr := &http.Transport{
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DialContext: statDial,
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TLSClientConfig: tlsCfg,
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TLSHandshakeTimeout: tlsHandshakeTimeout.GetOptionalArg(argIdx),
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MaxConnsPerHost: 2 * concurrency,
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MaxIdleConnsPerHost: 2 * concurrency,
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IdleConnTimeout: time.Minute,
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WriteBufferSize: 64 * 1024,
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}
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pURL := proxyURL.GetOptionalArg(argIdx)
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if len(pURL) > 0 {
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if !strings.Contains(pURL, "://") {
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logger.Fatalf("cannot parse -remoteWrite.proxyURL=%q: it must start with `http://`, `https://` or `socks5://`", pURL)
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}
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pu, err := url.Parse(pURL)
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if err != nil {
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logger.Fatalf("cannot parse -remoteWrite.proxyURL=%q: %s", pURL, err)
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}
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tr.Proxy = http.ProxyURL(pu)
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}
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hc := &http.Client{
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Transport: tr,
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Timeout: sendTimeout.GetOptionalArg(argIdx),
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}
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c := &client{
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sanitizedURL: sanitizedURL,
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remoteWriteURL: remoteWriteURL,
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authCfg: authCfg,
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awsCfg: awsCfg,
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fq: fq,
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hc: hc,
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stopCh: make(chan struct{}),
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}
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c.sendBlock = c.sendBlockHTTP
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useVMProto := forceVMProto.GetOptionalArg(argIdx)
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usePromProto := forcePromProto.GetOptionalArg(argIdx)
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if useVMProto && usePromProto {
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logger.Fatalf("-remoteWrite.useVMProto and -remoteWrite.usePromProto cannot be set simultaneously for -remoteWrite.url=%s", sanitizedURL)
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}
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if !useVMProto && !usePromProto {
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// Auto-detect whether the remote storage supports VictoriaMetrics remote write protocol.
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doRequest := func(url string) (*http.Response, error) {
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return c.doRequest(url, nil)
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}
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useVMProto = common.HandleVMProtoClientHandshake(c.remoteWriteURL, doRequest)
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if !useVMProto {
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logger.Infof("the remote storage at %q doesn't support VictoriaMetrics remote write protocol. Switching to Prometheus remote write protocol. "+
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"See https://docs.victoriametrics.com/vmagent.html#victoriametrics-remote-write-protocol", sanitizedURL)
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}
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}
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c.useVMProto = useVMProto
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return c
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}
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func (c *client) init(argIdx, concurrency int, sanitizedURL string) {
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if bytesPerSec := rateLimit.GetOptionalArg(argIdx); bytesPerSec > 0 {
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logger.Infof("applying %d bytes per second rate limit for -remoteWrite.url=%q", bytesPerSec, sanitizedURL)
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c.rl.perSecondLimit = int64(bytesPerSec)
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}
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c.rl.limitReached = metrics.GetOrCreateCounter(fmt.Sprintf(`vmagent_remotewrite_rate_limit_reached_total{url=%q}`, c.sanitizedURL))
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c.bytesSent = metrics.GetOrCreateCounter(fmt.Sprintf(`vmagent_remotewrite_bytes_sent_total{url=%q}`, c.sanitizedURL))
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c.blocksSent = metrics.GetOrCreateCounter(fmt.Sprintf(`vmagent_remotewrite_blocks_sent_total{url=%q}`, c.sanitizedURL))
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c.rateLimit = metrics.GetOrCreateGauge(fmt.Sprintf(`vmagent_remotewrite_rate_limit{url=%q}`, c.sanitizedURL), func() float64 {
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return float64(rateLimit.GetOptionalArg(argIdx))
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})
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c.requestDuration = metrics.GetOrCreateHistogram(fmt.Sprintf(`vmagent_remotewrite_duration_seconds{url=%q}`, c.sanitizedURL))
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c.requestsOKCount = metrics.GetOrCreateCounter(fmt.Sprintf(`vmagent_remotewrite_requests_total{url=%q, status_code="2XX"}`, c.sanitizedURL))
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c.errorsCount = metrics.GetOrCreateCounter(fmt.Sprintf(`vmagent_remotewrite_errors_total{url=%q}`, c.sanitizedURL))
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c.packetsDropped = metrics.GetOrCreateCounter(fmt.Sprintf(`vmagent_remotewrite_packets_dropped_total{url=%q}`, c.sanitizedURL))
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c.retriesCount = metrics.GetOrCreateCounter(fmt.Sprintf(`vmagent_remotewrite_retries_count_total{url=%q}`, c.sanitizedURL))
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c.sendDuration = metrics.GetOrCreateFloatCounter(fmt.Sprintf(`vmagent_remotewrite_send_duration_seconds_total{url=%q}`, c.sanitizedURL))
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metrics.GetOrCreateGauge(fmt.Sprintf(`vmagent_remotewrite_queues{url=%q}`, c.sanitizedURL), func() float64 {
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return float64(*queues)
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})
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for i := 0; i < concurrency; i++ {
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c.wg.Add(1)
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go func() {
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defer c.wg.Done()
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c.runWorker()
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}()
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}
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logger.Infof("initialized client for -remoteWrite.url=%q", c.sanitizedURL)
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}
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func (c *client) MustStop() {
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close(c.stopCh)
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c.wg.Wait()
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logger.Infof("stopped client for -remoteWrite.url=%q", c.sanitizedURL)
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}
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func getAuthConfig(argIdx int) (*promauth.Config, error) {
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headersValue := headers.GetOptionalArg(argIdx)
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var hdrs []string
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if headersValue != "" {
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hdrs = strings.Split(headersValue, "^^")
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}
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username := basicAuthUsername.GetOptionalArg(argIdx)
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password := basicAuthPassword.GetOptionalArg(argIdx)
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passwordFile := basicAuthPasswordFile.GetOptionalArg(argIdx)
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var basicAuthCfg *promauth.BasicAuthConfig
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if username != "" || password != "" || passwordFile != "" {
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basicAuthCfg = &promauth.BasicAuthConfig{
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Username: username,
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Password: promauth.NewSecret(password),
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PasswordFile: passwordFile,
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}
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}
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token := bearerToken.GetOptionalArg(argIdx)
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tokenFile := bearerTokenFile.GetOptionalArg(argIdx)
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var oauth2Cfg *promauth.OAuth2Config
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clientSecret := oauth2ClientSecret.GetOptionalArg(argIdx)
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clientSecretFile := oauth2ClientSecretFile.GetOptionalArg(argIdx)
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if clientSecretFile != "" || clientSecret != "" {
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endpointParamsJSON := oauth2EndpointParams.GetOptionalArg(argIdx)
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endpointParams, err := flagutil.ParseJSONMap(endpointParamsJSON)
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if err != nil {
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return nil, fmt.Errorf("cannot parse JSON for -remoteWrite.oauth2.endpointParams=%s: %w", endpointParamsJSON, err)
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}
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oauth2Cfg = &promauth.OAuth2Config{
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ClientID: oauth2ClientID.GetOptionalArg(argIdx),
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ClientSecret: promauth.NewSecret(clientSecret),
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ClientSecretFile: clientSecretFile,
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EndpointParams: endpointParams,
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TokenURL: oauth2TokenURL.GetOptionalArg(argIdx),
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Scopes: strings.Split(oauth2Scopes.GetOptionalArg(argIdx), ";"),
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}
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}
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tlsCfg := &promauth.TLSConfig{
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CAFile: tlsCAFile.GetOptionalArg(argIdx),
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CertFile: tlsCertFile.GetOptionalArg(argIdx),
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KeyFile: tlsKeyFile.GetOptionalArg(argIdx),
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ServerName: tlsServerName.GetOptionalArg(argIdx),
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InsecureSkipVerify: tlsInsecureSkipVerify.GetOptionalArg(argIdx),
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}
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opts := &promauth.Options{
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BasicAuth: basicAuthCfg,
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BearerToken: token,
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BearerTokenFile: tokenFile,
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OAuth2: oauth2Cfg,
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TLSConfig: tlsCfg,
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Headers: hdrs,
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}
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authCfg, err := opts.NewConfig()
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if err != nil {
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return nil, fmt.Errorf("cannot populate auth config for remoteWrite idx: %d, err: %w", argIdx, err)
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}
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return authCfg, nil
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}
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func getAWSAPIConfig(argIdx int) (*awsapi.Config, error) {
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if !awsUseSigv4.GetOptionalArg(argIdx) {
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return nil, nil
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}
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ec2Endpoint := awsEC2Endpoint.GetOptionalArg(argIdx)
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stsEndpoint := awsSTSEndpoint.GetOptionalArg(argIdx)
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region := awsRegion.GetOptionalArg(argIdx)
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roleARN := awsRoleARN.GetOptionalArg(argIdx)
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accessKey := awsAccessKey.GetOptionalArg(argIdx)
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secretKey := awsSecretKey.GetOptionalArg(argIdx)
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service := awsService.GetOptionalArg(argIdx)
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cfg, err := awsapi.NewConfig(ec2Endpoint, stsEndpoint, region, roleARN, accessKey, secretKey, service)
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if err != nil {
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return nil, err
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}
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return cfg, nil
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}
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func (c *client) runWorker() {
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var ok bool
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var block []byte
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ch := make(chan bool, 1)
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for {
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block, ok = c.fq.MustReadBlock(block[:0])
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if !ok {
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return
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}
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go func() {
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startTime := time.Now()
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ch <- c.sendBlock(block)
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c.sendDuration.Add(time.Since(startTime).Seconds())
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}()
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select {
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case ok := <-ch:
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if ok {
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// The block has been sent successfully
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continue
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}
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// Return unsent block to the queue.
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c.fq.MustWriteBlockIgnoreDisabledPQ(block)
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return
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case <-c.stopCh:
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// c must be stopped. Wait for a while in the hope the block will be sent.
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graceDuration := 5 * time.Second
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select {
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case ok := <-ch:
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if !ok {
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// Return unsent block to the queue.
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c.fq.MustWriteBlockIgnoreDisabledPQ(block)
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}
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case <-time.After(graceDuration):
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// Return unsent block to the queue.
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c.fq.MustWriteBlockIgnoreDisabledPQ(block)
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}
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return
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}
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}
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}
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func (c *client) doRequest(url string, body []byte) (*http.Response, error) {
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req, err := c.newRequest(url, body)
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if err != nil {
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return nil, err
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}
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resp, err := c.hc.Do(req)
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if err == nil {
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return resp, nil
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}
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if !errors.Is(err, io.EOF) && !errors.Is(err, io.ErrUnexpectedEOF) {
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return nil, err
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}
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// It is likely connection became stale or timed out during the first request.
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// Make another attempt in hope request will succeed.
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// If not, the error should be handled by the caller as usual.
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// This should help with https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4139
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req, err = c.newRequest(url, body)
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if err != nil {
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return nil, fmt.Errorf("second attempt: %w", err)
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}
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resp, err = c.hc.Do(req)
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if err != nil {
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return nil, fmt.Errorf("second attempt: %w", err)
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}
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return resp, nil
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}
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func (c *client) newRequest(url string, body []byte) (*http.Request, error) {
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reqBody := bytes.NewBuffer(body)
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req, err := http.NewRequest(http.MethodPost, url, reqBody)
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if err != nil {
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logger.Panicf("BUG: unexpected error from http.NewRequest(%q): %s", url, err)
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}
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err = c.authCfg.SetHeaders(req, true)
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if err != nil {
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return nil, err
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}
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h := req.Header
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h.Set("User-Agent", "vmagent")
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h.Set("Content-Type", "application/x-protobuf")
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if c.useVMProto {
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h.Set("Content-Encoding", "zstd")
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h.Set("X-VictoriaMetrics-Remote-Write-Version", "1")
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} else {
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h.Set("Content-Encoding", "snappy")
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h.Set("X-Prometheus-Remote-Write-Version", "0.1.0")
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}
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if c.awsCfg != nil {
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sigv4Hash := awsapi.HashHex(body)
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if err := c.awsCfg.SignRequest(req, sigv4Hash); err != nil {
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return nil, fmt.Errorf("cannot sign remoteWrite request with AWS sigv4: %w", err)
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}
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}
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return req, nil
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}
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// sendBlockHTTP sends the given block to c.remoteWriteURL.
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//
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// The function returns false only if c.stopCh is closed.
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// Otherwise it tries sending the block to remote storage indefinitely.
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func (c *client) sendBlockHTTP(block []byte) bool {
|
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c.rl.register(len(block), c.stopCh)
|
|
maxRetryDuration := timeutil.AddJitterToDuration(time.Minute)
|
|
retryDuration := timeutil.AddJitterToDuration(time.Second)
|
|
retriesCount := 0
|
|
|
|
again:
|
|
startTime := time.Now()
|
|
resp, err := c.doRequest(c.remoteWriteURL, block)
|
|
c.requestDuration.UpdateDuration(startTime)
|
|
if err != nil {
|
|
c.errorsCount.Inc()
|
|
retryDuration *= 2
|
|
if retryDuration > maxRetryDuration {
|
|
retryDuration = maxRetryDuration
|
|
}
|
|
logger.Warnf("couldn't send a block with size %d bytes to %q: %s; re-sending the block in %.3f seconds",
|
|
len(block), c.sanitizedURL, err, retryDuration.Seconds())
|
|
t := timerpool.Get(retryDuration)
|
|
select {
|
|
case <-c.stopCh:
|
|
timerpool.Put(t)
|
|
return false
|
|
case <-t.C:
|
|
timerpool.Put(t)
|
|
}
|
|
c.retriesCount.Inc()
|
|
goto again
|
|
}
|
|
statusCode := resp.StatusCode
|
|
if statusCode/100 == 2 {
|
|
_ = resp.Body.Close()
|
|
c.requestsOKCount.Inc()
|
|
c.bytesSent.Add(len(block))
|
|
c.blocksSent.Inc()
|
|
return true
|
|
}
|
|
metrics.GetOrCreateCounter(fmt.Sprintf(`vmagent_remotewrite_requests_total{url=%q, status_code="%d"}`, c.sanitizedURL, statusCode)).Inc()
|
|
if statusCode == 409 || statusCode == 400 {
|
|
body, err := io.ReadAll(resp.Body)
|
|
_ = resp.Body.Close()
|
|
if err != nil {
|
|
remoteWriteRejectedLogger.Errorf("sending a block with size %d bytes to %q was rejected (skipping the block): status code %d; "+
|
|
"failed to read response body: %s",
|
|
len(block), c.sanitizedURL, statusCode, err)
|
|
} else {
|
|
remoteWriteRejectedLogger.Errorf("sending a block with size %d bytes to %q was rejected (skipping the block): status code %d; response body: %s",
|
|
len(block), c.sanitizedURL, statusCode, string(body))
|
|
}
|
|
// Just drop block on 409 and 400 status codes like Prometheus does.
|
|
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/873
|
|
// and https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1149
|
|
_ = resp.Body.Close()
|
|
c.packetsDropped.Inc()
|
|
return true
|
|
}
|
|
|
|
// Unexpected status code returned
|
|
retriesCount++
|
|
retryDuration *= 2
|
|
if retryDuration > maxRetryDuration {
|
|
retryDuration = maxRetryDuration
|
|
}
|
|
body, err := io.ReadAll(resp.Body)
|
|
_ = resp.Body.Close()
|
|
if err != nil {
|
|
logger.Errorf("cannot read response body from %q during retry #%d: %s", c.sanitizedURL, retriesCount, err)
|
|
} else {
|
|
logger.Errorf("unexpected status code received after sending a block with size %d bytes to %q during retry #%d: %d; response body=%q; "+
|
|
"re-sending the block in %.3f seconds", len(block), c.sanitizedURL, retriesCount, statusCode, body, retryDuration.Seconds())
|
|
}
|
|
t := timerpool.Get(retryDuration)
|
|
select {
|
|
case <-c.stopCh:
|
|
timerpool.Put(t)
|
|
return false
|
|
case <-t.C:
|
|
timerpool.Put(t)
|
|
}
|
|
c.retriesCount.Inc()
|
|
goto again
|
|
}
|
|
|
|
var remoteWriteRejectedLogger = logger.WithThrottler("remoteWriteRejected", 5*time.Second)
|
|
|
|
type rateLimiter struct {
|
|
perSecondLimit int64
|
|
|
|
// mu protects budget and deadline from concurrent access.
|
|
mu sync.Mutex
|
|
|
|
// The current budget. It is increased by perSecondLimit every second.
|
|
budget int64
|
|
|
|
// The next deadline for increasing the budget by perSecondLimit
|
|
deadline time.Time
|
|
|
|
limitReached *metrics.Counter
|
|
}
|
|
|
|
func (rl *rateLimiter) register(dataLen int, stopCh <-chan struct{}) {
|
|
limit := rl.perSecondLimit
|
|
if limit <= 0 {
|
|
return
|
|
}
|
|
|
|
rl.mu.Lock()
|
|
defer rl.mu.Unlock()
|
|
|
|
for rl.budget <= 0 {
|
|
if d := time.Until(rl.deadline); d > 0 {
|
|
rl.limitReached.Inc()
|
|
t := timerpool.Get(d)
|
|
select {
|
|
case <-stopCh:
|
|
timerpool.Put(t)
|
|
return
|
|
case <-t.C:
|
|
timerpool.Put(t)
|
|
}
|
|
}
|
|
rl.budget += limit
|
|
rl.deadline = time.Now().Add(time.Second)
|
|
}
|
|
rl.budget -= int64(dataLen)
|
|
}
|