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// Copyright (c) The go-grpc-middleware Authors.
// Licensed under the Apache License 2.0.
package main
import (
"context"
"fmt"
"net/http"
"os"
"syscall"
"time"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
grpcprom "github.com/grpc-ecosystem/go-grpc-middleware/providers/prometheus"
"github.com/grpc-ecosystem/go-grpc-middleware/v2/interceptors/logging"
"github.com/grpc-ecosystem/go-grpc-middleware/v2/interceptors/timeout"
"github.com/grpc-ecosystem/go-grpc-middleware/v2/metadata"
"github.com/grpc-ecosystem/go-grpc-middleware/v2/testing/testpb"
"github.com/oklog/run"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
"go.opentelemetry.io/otel"
stdout "go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
"go.opentelemetry.io/otel/propagation"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
"go.opentelemetry.io/otel/trace"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
grpcMetadata "google.golang.org/grpc/metadata"
)
const (
component = "grpc-example"
httpAddr = ":8082"
targetGRPCAddr = "localhost:8080"
)
// interceptorLogger adapts go-kit logger to interceptor logger.
// This code is simple enough to be copied and not imported.
func interceptorLogger(l log.Logger) logging.Logger {
return logging.LoggerFunc(func(_ context.Context, lvl logging.Level, msg string, fields ...any) {
largs := append([]any{"msg", msg}, fields...)
switch lvl {
case logging.LevelDebug:
_ = level.Debug(l).Log(largs...)
case logging.LevelInfo:
_ = level.Info(l).Log(largs...)
case logging.LevelWarn:
_ = level.Warn(l).Log(largs...)
case logging.LevelError:
_ = level.Error(l).Log(largs...)
default:
panic(fmt.Sprintf("unknown level %v", lvl))
}
})
}
func main() {
// Setup logging.
logger := log.NewLogfmtLogger(os.Stderr)
rpcLogger := log.With(logger, "service", "gRPC/client", "component", component)
logTraceID := func(ctx context.Context) logging.Fields {
if span := trace.SpanContextFromContext(ctx); span.IsSampled() {
return logging.Fields{"traceID", span.TraceID().String()}
}
return nil
}
// Setup metrics.
reg := prometheus.NewRegistry()
clMetrics := grpcprom.NewClientMetrics(
grpcprom.WithClientHandlingTimeHistogram(
grpcprom.WithHistogramBuckets([]float64{0.001, 0.01, 0.1, 0.3, 0.6, 1, 3, 6, 9, 20, 30, 60, 90, 120}),
),
)
reg.MustRegister(clMetrics)
exemplarFromContext := func(ctx context.Context) prometheus.Labels {
if span := trace.SpanContextFromContext(ctx); span.IsSampled() {
return prometheus.Labels{"traceID": span.TraceID().String()}
}
return nil
}
// Set up OTLP tracing (stdout for debug).
exporter, err := stdout.New(stdout.WithPrettyPrint())
if err != nil {
level.Error(logger).Log("err", err)
os.Exit(1)
}
tp := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithBatcher(exporter),
)
otel.SetTracerProvider(tp)
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
defer func() { _ = exporter.Shutdown(context.Background()) }()
cc, err := grpc.Dial(
targetGRPCAddr,
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithChainUnaryInterceptor(
timeout.UnaryClientInterceptor(500*time.Millisecond),
otelgrpc.UnaryClientInterceptor(),
clMetrics.UnaryClientInterceptor(grpcprom.WithExemplarFromContext(exemplarFromContext)),
logging.UnaryClientInterceptor(interceptorLogger(rpcLogger), logging.WithFieldsFromContext(logTraceID))),
grpc.WithChainStreamInterceptor(
otelgrpc.StreamClientInterceptor(),
clMetrics.StreamClientInterceptor(grpcprom.WithExemplarFromContext(exemplarFromContext)),
logging.StreamClientInterceptor(interceptorLogger(rpcLogger), logging.WithFieldsFromContext(logTraceID))),
)
if err != nil {
level.Error(logger).Log("err", err)
os.Exit(1)
}
cl := testpb.NewTestServiceClient(cc)
g := &run.Group{}
ctx, cancel := context.WithCancel(context.Background())
g.Add(func() error {
for {
select {
case <-ctx.Done():
return nil
case <-time.After(1 * time.Second):
}
md := grpcMetadata.Pairs("authorization", "bearer yolo")
if _, err := cl.Ping(metadata.MD(md).ToOutgoing(ctx), &testpb.PingRequest{Value: "example"}); err != nil {
return err
}
}
}, func(err error) {
cancel()
})
httpSrv := &http.Server{Addr: httpAddr}
g.Add(func() error {
m := http.NewServeMux()
// Create HTTP handler for Prometheus metrics.
m.Handle("/metrics", promhttp.HandlerFor(
reg,
promhttp.HandlerOpts{
// Opt into OpenMetrics e.g. to support exemplars.
EnableOpenMetrics: true,
},
))
httpSrv.Handler = m
level.Info(logger).Log("msg", "starting HTTP server", "addr", httpSrv.Addr)
return httpSrv.ListenAndServe()
}, func(error) {
if err := httpSrv.Close(); err != nil {
level.Error(logger).Log("msg", "failed to stop web server", "err", err)
}
})
g.Add(run.SignalHandler(context.Background(), syscall.SIGINT, syscall.SIGTERM))
if err := g.Run(); err != nil {
level.Error(logger).Log("err", err)
os.Exit(1)
}
}
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