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grpc.go
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grpc.go
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// Copyright 2018, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package grpcmetrics
import (
"time"
"go.opencensus.io/tag"
"golang.org/x/net/context"
"google.golang.org/grpc/grpclog"
"google.golang.org/grpc/stats"
)
type ClientHandler struct {
}
func (c *ClientHandler) HandleConn(ctx context.Context, cs stats.ConnStats) {
// no-op
}
func (c *ClientHandler) TagConn(ctx context.Context, cti *stats.ConnTagInfo) context.Context {
// no-op
return ctx
}
func (c *ClientHandler) HandleRPC(ctx context.Context, rs stats.RPCStats) {
statsHandleRPC(ctx, rs)
}
func (c *ClientHandler) TagRPC(ctx context.Context, rti *stats.RPCTagInfo) context.Context {
ctx = c.statsTagRPC(ctx, rti)
return ctx
}
func (h *ClientHandler) statsTagRPC(ctx context.Context, info *stats.RPCTagInfo) context.Context {
startTime := time.Now()
if info == nil {
if grpclog.V(2) {
grpclog.Infoln("Failed to retrieve *rpcData from context.")
}
return ctx
}
d := &rpcData{
startTime: startTime,
method: info.FullMethodName,
}
ts := tag.FromContext(ctx)
if ts != nil {
encoded := tag.Encode(ts)
ctx = stats.SetTags(ctx, encoded)
}
return context.WithValue(ctx, rpcDataKey, d)
}