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1/*
2 *
3 * Copyright 2016 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19package stats
20
21import (
22	"net"
23
24	"golang.org/x/net/context"
25)
26
27// ConnTagInfo defines the relevant information needed by connection context tagger.
28type ConnTagInfo struct {
29	// RemoteAddr is the remote address of the corresponding connection.
30	RemoteAddr net.Addr
31	// LocalAddr is the local address of the corresponding connection.
32	LocalAddr net.Addr
33}
34
35// RPCTagInfo defines the relevant information needed by RPC context tagger.
36type RPCTagInfo struct {
37	// FullMethodName is the RPC method in the format of /package.service/method.
38	FullMethodName string
39	// FailFast indicates if this RPC is failfast.
40	// This field is only valid on client side, it's always false on server side.
41	FailFast bool
42}
43
44// Handler defines the interface for the related stats handling (e.g., RPCs, connections).
45type Handler interface {
46	// TagRPC can attach some information to the given context.
47	// The context used for the rest lifetime of the RPC will be derived from
48	// the returned context.
49	TagRPC(context.Context, *RPCTagInfo) context.Context
50	// HandleRPC processes the RPC stats.
51	HandleRPC(context.Context, RPCStats)
52
53	// TagConn can attach some information to the given context.
54	// The returned context will be used for stats handling.
55	// For conn stats handling, the context used in HandleConn for this
56	// connection will be derived from the context returned.
57	// For RPC stats handling,
58	//  - On server side, the context used in HandleRPC for all RPCs on this
59	// connection will be derived from the context returned.
60	//  - On client side, the context is not derived from the context returned.
61	TagConn(context.Context, *ConnTagInfo) context.Context
62	// HandleConn processes the Conn stats.
63	HandleConn(context.Context, ConnStats)
64}
65