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interceptors.go
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interceptors.go
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package log
import (
"context"
"github.com/google/uuid"
"google.golang.org/grpc"
)
type ServerStream struct {
grpc.ServerStream
NewContext context.Context
}
func (w *ServerStream) Context() context.Context {
return w.NewContext
}
func NewServerStream(stream grpc.ServerStream) *ServerStream {
if existing, ok := stream.(*ServerStream); ok {
return existing
}
return &ServerStream{ServerStream: stream, NewContext: stream.Context()}
}
func StreamInterceptor() grpc.StreamServerInterceptor {
return func(
srv interface{},
stream grpc.ServerStream,
info *grpc.StreamServerInfo,
handler grpc.StreamHandler,
) error {
newCtx := AddRequestNameAndID(stream.Context(), info.FullMethod)
newStream := NewServerStream(stream)
newStream.NewContext = newCtx
err := handler(srv, newStream)
if err != nil {
Debugf(newCtx, "stream error: %+v", err)
}
return err
}
}
func UnaryInterceptor() grpc.UnaryServerInterceptor {
return func(
ctx context.Context,
req interface{},
info *grpc.UnaryServerInfo,
handler grpc.UnaryHandler,
) (interface{}, error) {
newCtx := AddRequestNameAndID(ctx, info.FullMethod)
Debugf(newCtx, "Request: %+v", req)
resp, err := handler(newCtx, req)
if err != nil {
Debugf(newCtx, "Response error: %+v", err)
} else {
Debugf(newCtx, "Response: %+v", resp)
}
return resp, err
}
}
func AddRequestNameAndID(ctx context.Context, name string) context.Context {
return addRequestName(addRequestID(ctx), name)
}
func addRequestID(ctx context.Context) context.Context {
return context.WithValue(ctx, ID{}, uuid.New().String())
}
func addRequestName(ctx context.Context, req string) context.Context {
return context.WithValue(ctx, Name{}, req)
}