forked from TrueCloudLab/distribution
81 lines
2.8 KiB
Go
81 lines
2.8 KiB
Go
// 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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"context"
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"google.golang.org/grpc/stats"
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"go.opencensus.io/trace"
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)
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// ServerHandler implements gRPC stats.Handler recording OpenCensus stats and
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// traces. Use with gRPC servers.
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//
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// When installed (see Example), tracing metadata is read from inbound RPCs
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// by default. If no tracing metadata is present, or if the tracing metadata is
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// present but the SpanContext isn't sampled, then a new trace may be started
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// (as determined by Sampler).
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type ServerHandler struct {
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// IsPublicEndpoint may be set to true to always start a new trace around
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// each RPC. Any SpanContext in the RPC metadata will be added as a linked
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// span instead of making it the parent of the span created around the
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// server RPC.
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//
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// Be aware that if you leave this false (the default) on a public-facing
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// server, callers will be able to send tracing metadata in gRPC headers
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// and trigger traces in your backend.
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IsPublicEndpoint bool
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// StartOptions to use for to spans started around RPCs handled by this server.
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//
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// These will apply even if there is tracing metadata already
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// present on the inbound RPC but the SpanContext is not sampled. This
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// ensures that each service has some opportunity to be traced. If you would
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// like to not add any additional traces for this gRPC service, set:
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//
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// StartOptions.Sampler = trace.ProbabilitySampler(0.0)
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//
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// StartOptions.SpanKind will always be set to trace.SpanKindServer
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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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var _ stats.Handler = (*ServerHandler)(nil)
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// HandleConn exists to satisfy gRPC stats.Handler.
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func (s *ServerHandler) 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 (s *ServerHandler) 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 (s *ServerHandler) 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 (s *ServerHandler) TagRPC(ctx context.Context, rti *stats.RPCTagInfo) context.Context {
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ctx = s.traceTagRPC(ctx, rti)
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ctx = s.statsTagRPC(ctx, rti)
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return ctx
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}
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