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// Copyright (c) The go-grpc-middleware Authors.
// Licensed under the Apache License 2.0.
// Go gRPC Middleware monitoring interceptors for client-side gRPC.
package interceptors
import (
"context"
"io"
"time"
"google.golang.org/grpc"
)
// UnaryClientInterceptor is a gRPC client-side interceptor that provides reporting for Unary RPCs.
func UnaryClientInterceptor(reportable ClientReportable) grpc.UnaryClientInterceptor {
return func(ctx context.Context, method string, req, reply any, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
r := newReport(NewClientCallMeta(method, nil, req))
reporter, newCtx := reportable.ClientReporter(ctx, r.callMeta)
reporter.PostMsgSend(req, nil, time.Since(r.startTime))
err := invoker(newCtx, method, req, reply, cc, opts...)
reporter.PostMsgReceive(reply, err, time.Since(r.startTime))
reporter.PostCall(err, time.Since(r.startTime))
return err
}
}
// StreamClientInterceptor is a gRPC client-side interceptor that provides reporting for Stream RPCs.
func StreamClientInterceptor(reportable ClientReportable) grpc.StreamClientInterceptor {
return func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
r := newReport(NewClientCallMeta(method, desc, nil))
reporter, newCtx := reportable.ClientReporter(ctx, r.callMeta)
clientStream, err := streamer(newCtx, desc, cc, method, opts...)
if err != nil {
reporter.PostCall(err, time.Since(r.startTime))
return nil, err
}
return &monitoredClientStream{ClientStream: clientStream, startTime: r.startTime, reporter: reporter}, nil
}
}
// monitoredClientStream wraps grpc.ClientStream allowing each Sent/Recv of message to report.
type monitoredClientStream struct {
grpc.ClientStream
startTime time.Time
reporter Reporter
}
func (s *monitoredClientStream) SendMsg(m any) error {
start := time.Now()
err := s.ClientStream.SendMsg(m)
s.reporter.PostMsgSend(m, err, time.Since(start))
return err
}
func (s *monitoredClientStream) RecvMsg(m any) error {
start := time.Now()
err := s.ClientStream.RecvMsg(m)
s.reporter.PostMsgReceive(m, err, time.Since(start))
if err == nil {
return nil
}
var postErr error
if err != io.EOF {
postErr = err
}
s.reporter.PostCall(postErr, time.Since(s.startTime))
return err
}
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