mirror of https://github.com/tidwall/tile38.git
64 lines
1.8 KiB
Go
64 lines
1.8 KiB
Go
// Copyright 2017, 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 ocgrpc
|
|
|
|
import (
|
|
"time"
|
|
|
|
"context"
|
|
|
|
"go.opencensus.io/tag"
|
|
"google.golang.org/grpc/grpclog"
|
|
"google.golang.org/grpc/stats"
|
|
)
|
|
|
|
// statsTagRPC gets the metadata from gRPC context, extracts the encoded tags from
|
|
// it and creates a new tag.Map and puts them into the returned context.
|
|
func (h *ServerHandler) statsTagRPC(ctx context.Context, info *stats.RPCTagInfo) context.Context {
|
|
startTime := time.Now()
|
|
if info == nil {
|
|
if grpclog.V(2) {
|
|
grpclog.Infof("opencensus: TagRPC called with nil info.")
|
|
}
|
|
return ctx
|
|
}
|
|
d := &rpcData{
|
|
startTime: startTime,
|
|
method: info.FullMethodName,
|
|
}
|
|
propagated := h.extractPropagatedTags(ctx)
|
|
ctx = tag.NewContext(ctx, propagated)
|
|
ctx, _ = tag.New(ctx, tag.Upsert(KeyServerMethod, methodName(info.FullMethodName)))
|
|
return context.WithValue(ctx, rpcDataKey, d)
|
|
}
|
|
|
|
// extractPropagatedTags creates a new tag map containing the tags extracted from the
|
|
// gRPC metadata.
|
|
func (h *ServerHandler) extractPropagatedTags(ctx context.Context) *tag.Map {
|
|
buf := stats.Tags(ctx)
|
|
if buf == nil {
|
|
return nil
|
|
}
|
|
propagated, err := tag.Decode(buf)
|
|
if err != nil {
|
|
if grpclog.V(2) {
|
|
grpclog.Warningf("opencensus: Failed to decode tags from gRPC metadata failed to decode: %v", err)
|
|
}
|
|
return nil
|
|
}
|
|
return propagated
|
|
}
|