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Pinger service for Multiple Cluster Latency Measurement.
Context: #301 This creates a simple HTTP endpoint and/or a rate limited UDP echo service to be able to easily do RTT latency tests from game clients, to multiple Agones installs.
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| Original file line number | Diff line number | Diff line change |
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| # Copyright 2018 Google Inc. All Rights Reserved. | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
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| FROM alpine:3.8 | ||
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| RUN apk --update add ca-certificates && \ | ||
| adduser -D agones | ||
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| COPY ./bin/ping /home/agones/ping | ||
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| RUN chown -R agones /home/agones && \ | ||
| chmod o+x /home/agones/ping | ||
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| USER agones | ||
| ENTRYPOINT ["/home/agones/ping"] |
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| // Copyright 2018 Google Inc. All Rights Reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| // binary for the pinger service for RTT measurement. | ||
| package main | ||
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| import ( | ||
| "context" | ||
| "net/http" | ||
| "strings" | ||
| "time" | ||
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| "agones.dev/agones/pkg" | ||
| "agones.dev/agones/pkg/util/runtime" | ||
| "agones.dev/agones/pkg/util/signals" | ||
| "github.com/heptiolabs/healthcheck" | ||
| "github.com/pkg/errors" | ||
| "github.com/spf13/pflag" | ||
| "github.com/spf13/viper" | ||
| "golang.org/x/time/rate" | ||
| ) | ||
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| const ( | ||
| httpResponseFlag = "http-response" | ||
| udpRateLimitFlag = "udp-rate-limit" | ||
| ) | ||
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| var ( | ||
| logger = runtime.NewLoggerWithSource("main") | ||
| ) | ||
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| func main() { | ||
| ctlConf := parseEnvFlags() | ||
| if err := ctlConf.validate(); err != nil { | ||
| logger.WithError(err).Fatal("could not create controller from environment or flags") | ||
| } | ||
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| logger.WithField("version", pkg.Version). | ||
| WithField("ctlConf", ctlConf).Info("starting ping...") | ||
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| stop := signals.NewStopChannel() | ||
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| udpSrv := serveUDP(ctlConf, stop) | ||
| defer udpSrv.close() | ||
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| h := healthcheck.NewHandler() | ||
| h.AddLivenessCheck("udp-server", udpSrv.Health) | ||
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| cancel := serveHTTP(ctlConf, h) | ||
| defer cancel() | ||
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| <-stop | ||
| logger.Info("shutting down...") | ||
| } | ||
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| func serveUDP(ctlConf config, stop <-chan struct{}) *udpServer { | ||
| s := newUDPServer(ctlConf.UDPRateLimit) | ||
| s.run(stop) | ||
| return s | ||
| } | ||
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| // serveHTTP starts the HTTP handler, and returns a cancel/shutdown function | ||
| func serveHTTP(ctlConf config, h healthcheck.Handler) func() { | ||
| // we don't need a health checker, we already have a http endpoint that returns 200 | ||
| mux := http.NewServeMux() | ||
| srv := &http.Server{ | ||
| Addr: ":8080", | ||
| Handler: mux, | ||
| } | ||
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| // add health check as well | ||
| mux.HandleFunc("/live", h.LiveEndpoint) | ||
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| mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { | ||
| if _, err := w.Write([]byte(ctlConf.HTTPResponse)); err != nil { | ||
| w.WriteHeader(http.StatusInternalServerError) | ||
| logger.WithError(err).Error("error responding to http request") | ||
| } | ||
| }) | ||
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| go func() { | ||
| logger.Info("starting HTTP Server...") | ||
| logger.WithError(srv.ListenAndServe()).Fatal("could not start HTTP server") | ||
| }() | ||
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| return func() { | ||
| ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) | ||
| defer cancel() | ||
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| if err := srv.Shutdown(ctx); err != nil { | ||
| logger.WithError(err).Fatal("could not shut down HTTP server") | ||
| } | ||
| } | ||
| } | ||
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| // config retains the configuration information | ||
| type config struct { | ||
| HTTPResponse string | ||
| UDPRateLimit rate.Limit | ||
| } | ||
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| // validate returns an error if there is a validation problem | ||
| func (c *config) validate() error { | ||
| if c.UDPRateLimit < 0 { | ||
| return errors.New("UDP Rate limit must be greater that or equal to zero") | ||
| } | ||
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| return nil | ||
| } | ||
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| func parseEnvFlags() config { | ||
| viper.SetDefault(httpResponseFlag, "ok") | ||
| viper.SetDefault(udpRateLimitFlag, 20) | ||
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| pflag.String(httpResponseFlag, viper.GetString(httpResponseFlag), "Flag to set text value when a 200 response is returned. Can be useful to identify clusters. Defaults to 'ok' Can also use HTTP_RESPONSE env variable") | ||
| pflag.Float64(udpRateLimitFlag, viper.GetFloat64(httpResponseFlag), "Flag to set how many UDP requests can be handled by a single source IP per second. Defaults to 20. Can also use UDP_RATE_LIMIT env variable") | ||
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| viper.SetEnvKeyReplacer(strings.NewReplacer("-", "_")) | ||
| runtime.Must(viper.BindEnv(httpResponseFlag)) | ||
| runtime.Must(viper.BindEnv(udpRateLimitFlag)) | ||
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| return config{ | ||
| HTTPResponse: viper.GetString(httpResponseFlag), | ||
| UDPRateLimit: rate.Limit(viper.GetFloat64(udpRateLimitFlag)), | ||
| } | ||
| } |
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