57 lines
1.8 KiB
Go
57 lines
1.8 KiB
Go
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// Copyright 2018, 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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package ocgrpc
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import (
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"go.opencensus.io/trace"
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"golang.org/x/net/context"
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"google.golang.org/grpc/stats"
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)
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// ClientHandler implements a gRPC stats.Handler for recording OpenCensus stats and
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// traces. Use with gRPC clients only.
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type ClientHandler struct {
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// StartOptions allows configuring the StartOptions used to create new spans.
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//
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// StartOptions.SpanKind will always be set to trace.SpanKindClient
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// for spans started by this handler.
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StartOptions trace.StartOptions
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}
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// HandleConn exists to satisfy gRPC stats.Handler.
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func (c *ClientHandler) HandleConn(ctx context.Context, cs stats.ConnStats) {
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// no-op
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}
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// TagConn exists to satisfy gRPC stats.Handler.
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func (c *ClientHandler) TagConn(ctx context.Context, cti *stats.ConnTagInfo) context.Context {
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// no-op
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return ctx
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}
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// HandleRPC implements per-RPC tracing and stats instrumentation.
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func (c *ClientHandler) HandleRPC(ctx context.Context, rs stats.RPCStats) {
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traceHandleRPC(ctx, rs)
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statsHandleRPC(ctx, rs)
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}
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// TagRPC implements per-RPC context management.
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func (c *ClientHandler) TagRPC(ctx context.Context, rti *stats.RPCTagInfo) context.Context {
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ctx = c.traceTagRPC(ctx, rti)
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ctx = c.statsTagRPC(ctx, rti)
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return ctx
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}
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