64 lines
1.8 KiB
Go
64 lines
1.8 KiB
Go
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// Copyright 2017, OpenCensus Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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package ocgrpc
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import (
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"time"
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"context"
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"go.opencensus.io/tag"
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"google.golang.org/grpc/grpclog"
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"google.golang.org/grpc/stats"
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)
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// statsTagRPC gets the metadata from gRPC context, extracts the encoded tags from
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// it and creates a new tag.Map and puts them into the returned context.
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func (h *ServerHandler) statsTagRPC(ctx context.Context, info *stats.RPCTagInfo) context.Context {
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startTime := time.Now()
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if info == nil {
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if grpclog.V(2) {
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grpclog.Infof("opencensus: TagRPC called with nil info.")
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}
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return ctx
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}
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d := &rpcData{
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startTime: startTime,
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method: info.FullMethodName,
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}
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propagated := h.extractPropagatedTags(ctx)
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ctx = tag.NewContext(ctx, propagated)
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ctx, _ = tag.New(ctx, tag.Upsert(KeyServerMethod, methodName(info.FullMethodName)))
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return context.WithValue(ctx, rpcDataKey, d)
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}
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// extractPropagatedTags creates a new tag map containing the tags extracted from the
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// gRPC metadata.
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func (h *ServerHandler) extractPropagatedTags(ctx context.Context) *tag.Map {
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buf := stats.Tags(ctx)
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if buf == nil {
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return nil
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}
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propagated, err := tag.Decode(buf)
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if err != nil {
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if grpclog.V(2) {
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grpclog.Warningf("opencensus: Failed to decode tags from gRPC metadata failed to decode: %v", err)
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}
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return nil
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}
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return propagated
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}
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