fix typo of prometheus

zrpc/internal/serverinterceptors/prometheusinterceptor.go

@@ -0,0 +1,44 @@
+package serverinterceptors
+
+import (
+	"context"
+	"strconv"
+	"time"
+
+	"github.com/tal-tech/go-zero/core/metric"
+	"github.com/tal-tech/go-zero/core/timex"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/status"
+)
+
+const serverNamespace = "rpc_server"
+
+var (
+	metricServerReqDur = metric.NewHistogramVec(&metric.HistogramVecOpts{
+		Namespace: serverNamespace,
+		Subsystem: "requests",
+		Name:      "duration_ms",
+		Help:      "rpc server requests duration(ms).",
+		Labels:    []string{"method"},
+		Buckets:   []float64{5, 10, 25, 50, 100, 250, 500, 1000},
+	})
+
+	metricServerReqCodeTotal = metric.NewCounterVec(&metric.CounterVecOpts{
+		Namespace: serverNamespace,
+		Subsystem: "requests",
+		Name:      "code_total",
+		Help:      "rpc server requests code count.",
+		Labels:    []string{"method", "code"},
+	})
+)
+
+func UnaryPrometheusInterceptor() grpc.UnaryServerInterceptor {
+	return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (
+		interface{}, error) {
+		startTime := timex.Now()
+		resp, err := handler(ctx, req)
+		metricServerReqDur.Observe(int64(timex.Since(startTime)/time.Millisecond), info.FullMethod)
+		metricServerReqCodeTotal.Inc(info.FullMethod, strconv.Itoa(int(status.Code(err))))
+		return resp, err
+	}
+}