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interceptor.go
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interceptor.go
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package main
import (
"context"
"log"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
)
func UnaryServerInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
log.Println("UnaryServerInterceptor PRE", info.FullMethod)
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
log.Println("no metadata")
} else {
log.Printf("Metadata %v+\n", md)
}
m, err := handler(ctx, req)
log.Println("UnaryServerInterceptor POST", info.FullMethod)
return m, err
}
type wrappedStream struct {
grpc.ServerStream
}
func (w *wrappedStream) RecvMsg(m interface{}) error {
log.Printf("Received %T - %v\n", m, m)
return w.ServerStream.RecvMsg(m)
}
func (w *wrappedStream) SendMsg(m interface{}) error {
log.Printf("Sent %T - %v\n", m, m)
return w.ServerStream.SendMsg(m)
}
func newWrappedStream(s grpc.ServerStream) grpc.ServerStream {
return &wrappedStream{s}
}
func StreamServerInterceptor(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
log.Println("StreamServerInterceptor PRE", info.FullMethod)
err := handler(srv, newWrappedStream(ss))
log.Println("StreamServerInterceptor POST")
return err
}