mirror of
https://github.com/foomo/keel.git
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131 lines
6.3 KiB
Go
131 lines
6.3 KiB
Go
package main
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import (
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"context"
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"net/http"
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"syscall"
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"time"
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"github.com/foomo/keel/interfaces"
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"github.com/foomo/keel/service"
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"go.uber.org/zap"
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"github.com/foomo/keel"
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)
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func main() {
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service.DefaultHTTPHealthzAddr = "localhost:9400"
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l := zap.NewExample().Named("root")
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go func() {
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c := make(chan bool, 1)
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time.Sleep(2 * time.Second)
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l.Info("1. starting checks")
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go func() {
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c <- true
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for {
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call(l.Named("http"), "http://localhost:8080")
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call(l.Named("readiness"), "http://localhost:9400/healthz/readiness")
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time.Sleep(time.Second)
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}
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}()
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<-c
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close(c)
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l.Info("2. sleeping for 5 seconds")
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time.Sleep(5 * time.Second)
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l.Info("3. sending shutdown signal")
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if err := syscall.Kill(syscall.Getpid(), syscall.SIGTERM); err != nil {
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l.Fatal(err.Error())
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}
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}()
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svr := keel.NewServer(
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keel.WithLogger(l.Named("server")),
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keel.WithHTTPHealthzService(true),
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)
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// create demo service
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svs := http.NewServeMux()
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svs.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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_, _ = w.Write([]byte("OK"))
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})
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svr.AddService(
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service.NewHTTP(l, "http", "localhost:8080", svs),
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)
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svr.AddCloser(interfaces.CloserFunc(func(ctx context.Context) error {
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l := l.Named("closer")
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l.Info("closing stuff")
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time.Sleep(3 * time.Second)
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l.Info("done closing stuff")
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return nil
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}))
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svr.Run()
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l.Info("done")
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// Output:
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// {"level":"info","logger":"root.server","msg":"starting keel server"}
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// {"level":"info","logger":"root.server","msg":"starting keel service","keel_service_type":"http","keel_service_name":"healthz","net_host_ip":"localhost","net_host_port":"9400"}
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// {"level":"info","logger":"root","msg":"starting keel service","keel_service_type":"http","keel_service_name":"http","net_host_ip":"localhost","net_host_port":"8080"}
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// {"level":"info","logger":"root","msg":"1. starting checks"}
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// {"level":"info","logger":"root","msg":"2. sleeping for 5 seconds"}
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// {"level":"info","logger":"root.http","msg":"ok","url":"http://localhost:8080","status":200}
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// {"level":"info","logger":"root.readiness","msg":"ok","url":"http://localhost:9400/healthz/readiness","status":200}
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// {"level":"info","logger":"root.http","msg":"ok","url":"http://localhost:8080","status":200}
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// {"level":"info","logger":"root.readiness","msg":"ok","url":"http://localhost:9400/healthz/readiness","status":200}
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// {"level":"info","logger":"root.http","msg":"ok","url":"http://localhost:8080","status":200}
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// {"level":"info","logger":"root.readiness","msg":"ok","url":"http://localhost:9400/healthz/readiness","status":200}
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// {"level":"info","logger":"root.http","msg":"ok","url":"http://localhost:8080","status":200}
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// {"level":"info","logger":"root.readiness","msg":"ok","url":"http://localhost:9400/healthz/readiness","status":200}
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// {"level":"info","logger":"root.http","msg":"ok","url":"http://localhost:8080","status":200}
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// {"level":"info","logger":"root.readiness","msg":"ok","url":"http://localhost:9400/healthz/readiness","status":200}
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// {"level":"info","logger":"root","msg":"3. sending shutdown signal"}
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// {"level":"info","logger":"root.server","msg":"keel graceful shutdown","graceful_period":"30s"}
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// {"level":"info","logger":"root.server","msg":"keel graceful shutdown: closers"}
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// {"level":"info","logger":"root","msg":"stopping keel service","keel_service_type":"http","keel_service_name":"http"}
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// {"level":"debug","logger":"root.server","msg":"keel graceful shutdown: closer closed","name":"*service.HTTP"}
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// {"level":"info","logger":"root.closer","msg":"closing stuff"}
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// {"level":"error","logger":"root.http","msg":"failed to send request","url":"http://localhost:8080","error":"Get \"http://localhost:8080\": dial tcp [::1]:8080: connect: connection refused"}
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// {"level":"debug","logger":"root.server","msg":"healthz probe failed","error_type":"*errors.errorString","error_message":"service not running","http_target":"/healthz/readiness"}
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// {"level":"info","logger":"root.readiness","msg":"ok","url":"http://localhost:9400/healthz/readiness","status":503}
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// {"level":"error","logger":"root.http","msg":"failed to send request","url":"http://localhost:8080","error":"Get \"http://localhost:8080\": dial tcp [::1]:8080: connect: connection refused"}
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// {"level":"debug","logger":"root.server","msg":"healthz probe failed","error_type":"*errors.errorString","error_message":"service not running","http_target":"/healthz/readiness"}
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// {"level":"info","logger":"root.readiness","msg":"ok","url":"http://localhost:9400/healthz/readiness","status":503}
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// {"level":"error","logger":"root.http","msg":"failed to send request","url":"http://localhost:8080","error":"Get \"http://localhost:8080\": dial tcp [::1]:8080: connect: connection refused"}
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// {"level":"debug","logger":"root.server","msg":"healthz probe failed","error_type":"*errors.errorString","error_message":"service not running","http_target":"/healthz/readiness"}
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// {"level":"info","logger":"root.readiness","msg":"ok","url":"http://localhost:9400/healthz/readiness","status":503}
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// {"level":"info","logger":"root.closer","msg":"done closing stuff"}
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// {"level":"debug","logger":"root.server","msg":"keel graceful shutdown: closer closed","name":"interfaces.CloserFunc"}
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// {"level":"info","logger":"root.server","msg":"stopping keel service","keel_service_type":"http","keel_service_name":"healthz"}
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// {"level":"debug","logger":"root.server","msg":"keel graceful shutdown: closer closed","name":"*service.HTTP"}
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// {"level":"debug","logger":"root.server","msg":"keel graceful shutdown: closer closed","name":"noop.TracerProvider"}
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// {"level":"debug","logger":"root.server","msg":"keel graceful shutdown: closer closed","name":"noop.MeterProvider"}
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// {"level":"info","logger":"root.server","msg":"keel graceful shutdown: complete"}
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// {"level":"info","logger":"root.server","msg":"keel server stopped"}
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// {"level":"info","logger":"root","msg":"done"}
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}
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func call(l *zap.Logger, url string) {
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l = l.With(zap.String("url", url))
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ctx, cancel := context.WithTimeout(context.Background(), 500*time.Millisecond)
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defer cancel()
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
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if err != nil {
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l.With(zap.Error(err)).Error("failed to create request")
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return
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}
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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l.With(zap.Error(err)).Error("failed to send request")
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return
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}
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l.Info("ok", zap.Int("status", resp.StatusCode))
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}
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