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