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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "flag" | ||
| "log" | ||
| "os" | ||
| "os/signal" | ||
| "time" | ||
|
|
||
| "google.golang.org/grpc" | ||
| "google.golang.org/grpc/codes" | ||
| healthpb "google.golang.org/grpc/health/grpc_health_v1" | ||
| "google.golang.org/grpc/status" | ||
| ) | ||
|
|
||
| var ( | ||
| userAgent string | ||
| remoteURL string | ||
| serviceName string | ||
| connTimeoutDur time.Duration = time.Second | ||
| rpcTimeoutDur time.Duration = time.Second | ||
| verbose bool | ||
| ) | ||
|
|
||
| const ( | ||
| // StatusInvalidArguments indicates specified invalid arguments. | ||
| StatusInvalidArguments = 1 | ||
| // StatusConnectionFailure indicates connection failed. | ||
| StatusConnectionFailure = 2 | ||
| // StatusRPCFailure indicates rpc failed. | ||
| StatusRPCFailure = 3 | ||
| // StatusUnhealthy indicates rpc succeeded but indicates unhealthy service. | ||
| StatusUnhealthy = 4 | ||
| ) | ||
|
|
||
| func init() { | ||
| log.SetFlags(0) | ||
| flag.StringVar(&remoteURL, "addr", "", "(required) tcp host:port to connect") | ||
| flag.StringVar(&serviceName, "service", "", "service name to check (default: \"\")") | ||
| flag.StringVar(&userAgent, "user-agent", "grpc_health_probe", "user-agent header value of health check requests") | ||
| // timeouts | ||
| flag.DurationVar(&connTimeoutDur, "connect-timeout", connTimeoutDur, "timeout for establishing connection") | ||
| flag.DurationVar(&rpcTimeoutDur, "rpc-timeout", rpcTimeoutDur, "timeout for health check rpc") | ||
| // verbose | ||
| flag.BoolVar(&verbose, "v", false, "verbose logs") | ||
|
|
||
| flag.Parse() | ||
|
|
||
| argError := func(s string, v ...interface{}) { | ||
| log.Printf("error: "+s, v...) | ||
| os.Exit(StatusInvalidArguments) | ||
| } | ||
|
|
||
| if remoteURL == "" { | ||
| argError("--addr not specified") | ||
| } | ||
|
|
||
| if connTimeoutDur <= 0 { | ||
| argError("--connect-timeout must be greater than zero (specified: %v)", connTimeoutDur) | ||
| } | ||
| if rpcTimeoutDur <= 0 { | ||
| argError("--rpc-timeout must be greater than zero (specified: %v)", rpcTimeoutDur) | ||
| } | ||
| if verbose { | ||
| log.Printf("parsed options:") | ||
| log.Printf("> remoteUrl=%s conn-timeout=%v rpc-timeout=%v", remoteURL, connTimeoutDur, rpcTimeoutDur) | ||
| } | ||
| } | ||
|
|
||
| func main() { | ||
| ctx, cancel := context.WithCancel(context.Background()) | ||
|
|
||
| c := make(chan os.Signal, 1) | ||
| signal.Notify(c, os.Interrupt) | ||
| go func() { | ||
| sig := <-c | ||
| if sig == os.Interrupt { | ||
| log.Printf("cancellation received") | ||
| cancel() | ||
| return | ||
| } | ||
| }() | ||
|
|
||
| opts := []grpc.DialOption{ | ||
| grpc.WithUserAgent(userAgent), | ||
| grpc.WithBlock()} | ||
|
|
||
| opts = append(opts, grpc.WithInsecure()) | ||
|
|
||
| if verbose { | ||
| log.Print("establishing connection") | ||
| } | ||
| connStart := time.Now() | ||
| dialCtx, cancel2 := context.WithTimeout(ctx, connTimeoutDur) | ||
| defer cancel2() | ||
| conn, err := grpc.DialContext(dialCtx, remoteURL, opts...) | ||
| if err != nil { | ||
| if err == context.DeadlineExceeded { | ||
| log.Printf("timeout: failed to connect service %q within %v", remoteURL, connTimeoutDur) | ||
| } else { | ||
| log.Printf("error: failed to connect service at %q: %+v", remoteURL, err) | ||
| } | ||
| os.Exit(StatusConnectionFailure) | ||
| } | ||
| connDuration := time.Since(connStart) | ||
| defer conn.Close() | ||
| if verbose { | ||
| log.Printf("connection establisted (took %v)", connDuration) | ||
| } | ||
|
|
||
| rpcStart := time.Now() | ||
| rpcCtx, rpcCancel := context.WithTimeout(ctx, rpcTimeoutDur) | ||
| defer rpcCancel() | ||
| resp, err := healthpb.NewHealthClient(conn).Check(rpcCtx, &healthpb.HealthCheckRequest{Service: serviceName}) | ||
| log.Print(resp) | ||
| if err != nil { | ||
| if stat, ok := status.FromError(err); ok && stat.Code() == codes.Unimplemented { | ||
| log.Printf("error: this server does not implement the grpc health protocol (grpc.health.v1.Health)") | ||
| } else if stat, ok := status.FromError(err); ok && stat.Code() == codes.DeadlineExceeded { | ||
| log.Printf("timeout: health rpc did not complete within %v", rpcTimeoutDur) | ||
| } else { | ||
| log.Printf("error: health rpc failed: %+v", err) | ||
| } | ||
| os.Exit(StatusRPCFailure) | ||
| } | ||
| rpcDuration := time.Since(rpcStart) | ||
|
|
||
| if resp.GetStatus() != healthpb.HealthCheckResponse_SERVING { | ||
| log.Printf("service unhealthy (responded with %q)", resp.GetStatus().String()) | ||
| os.Exit(StatusUnhealthy) | ||
| } | ||
| if verbose { | ||
| log.Printf("time elapsed: connect=%v rpc=%v", connDuration, rpcDuration) | ||
| } | ||
| log.Printf("status: %v", resp.GetStatus().String()) | ||
| } | ||
|
|
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