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invocation_event_handler.go
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/
invocation_event_handler.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package grpc
import (
"io"
"github.com/fullstorydev/grpcurl"
"github.com/golang/protobuf/jsonpb"
"github.com/golang/protobuf/proto"
"github.com/jhump/protoreflect/desc"
"go.uber.org/zap"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
)
var jsonpbMarshaler = &jsonpb.Marshaler{Indent: " "}
var _ grpcurl.InvocationEventHandler = &invocationEventHandler{}
type invocationEventHandler struct {
output io.Writer
logger *zap.Logger
err error
}
func newInvocationEventHandler(output io.Writer, logger *zap.Logger) *invocationEventHandler {
return &invocationEventHandler{
output: output,
logger: logger,
}
}
func (i *invocationEventHandler) OnResolveMethod(*desc.MethodDescriptor) {}
func (i *invocationEventHandler) OnSendHeaders(metadata.MD) {}
func (i *invocationEventHandler) OnReceiveHeaders(metadata.MD) {}
func (i *invocationEventHandler) OnReceiveResponse(message proto.Message) {
i.println(i.marshal(message))
}
func (i *invocationEventHandler) OnReceiveTrailers(s *status.Status, _ metadata.MD) {
if err := s.Err(); err != nil {
i.err = err
}
}
func (i *invocationEventHandler) Err() error {
return i.err
}
func (i *invocationEventHandler) marshal(message proto.Message) string {
s, err := jsonpbMarshaler.MarshalToString(message)
if err != nil {
i.logger.Error("marshal error", zap.Error(err))
return ""
}
return s
}
func (i *invocationEventHandler) println(s string) {
if s == "" {
return
}
if _, err := i.output.Write([]byte(s + "\n")); err != nil {
i.logger.Error("write error", zap.Error(err))
}
}