forked from census-instrumentation/opencensus-go
/
server_handler.go
164 lines (143 loc) · 5.09 KB
/
server_handler.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
// Copyright 2017, 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 grpcstats
import (
"fmt"
"sync/atomic"
"time"
"golang.org/x/net/context"
ocstats "go.opencensus.io/stats"
"go.opencensus.io/tag"
"google.golang.org/grpc/grpclog"
"google.golang.org/grpc/stats"
"google.golang.org/grpc/status"
)
// ServerStatsHandler is a stats.Handler implementation
// that collects stats for a gRPC server. Predefined
// measures and views can be used to access the collected data.
type ServerStatsHandler struct{}
var _ stats.Handler = &ServerStatsHandler{}
// NewServerStatsHandler returns a stats.Handler implementation
// that collects stats for a gRPC server. Predefined
// measures and views can be used to access the collected data.
func NewServerStatsHandler() *ServerStatsHandler {
return &ServerStatsHandler{}
}
// TagConn adds connection related data to the given context and returns the
// new context.
func (h *ServerStatsHandler) TagConn(ctx context.Context, info *stats.ConnTagInfo) context.Context {
// Do nothing. This is here to satisfy the interface "google.golang.org/grpc/stats.Handler"
return ctx
}
// HandleConn processes the connection events.
func (h *ServerStatsHandler) HandleConn(ctx context.Context, s stats.ConnStats) {
// Do nothing. This is here to satisfy the interface "google.golang.org/grpc/stats.Handler"
}
// TagRPC gets the metadata from gRPC context, extracts the encoded tags from
// it and creates a new tag.Map and puts them into the returned context.
func (h *ServerStatsHandler) TagRPC(ctx context.Context, info *stats.RPCTagInfo) context.Context {
startTime := time.Now()
if info == nil {
if grpclog.V(2) {
grpclog.Infof("serverHandler.TagRPC called with nil info.", info.FullMethodName)
}
return ctx
}
d := &rpcData{startTime: startTime}
ctx, _ = h.createTags(ctx, info.FullMethodName)
ocstats.Record(ctx, RPCServerStartedCount.M(1))
return context.WithValue(ctx, grpcServerRPCKey, d)
}
// HandleRPC processes the RPC events.
func (h *ServerStatsHandler) HandleRPC(ctx context.Context, s stats.RPCStats) {
switch st := s.(type) {
case *stats.Begin, *stats.InHeader, *stats.InTrailer, *stats.OutHeader, *stats.OutTrailer:
// Do nothing for server
case *stats.InPayload:
h.handleRPCInPayload(ctx, st)
case *stats.OutPayload:
// For stream it can be called multiple times per RPC.
h.handleRPCOutPayload(ctx, st)
case *stats.End:
h.handleRPCEnd(ctx, st)
default:
grpclog.Infof("unexpected stats: %T", st)
}
}
func (h *ServerStatsHandler) handleRPCInPayload(ctx context.Context, s *stats.InPayload) {
d, ok := ctx.Value(grpcServerRPCKey).(*rpcData)
if !ok {
if grpclog.V(2) {
grpclog.Infoln("serverHandler.handleRPCInPayload failed to retrieve *rpcData from context")
}
return
}
ocstats.Record(ctx, RPCServerRequestBytes.M(int64(s.Length)))
atomic.AddInt64(&d.reqCount, 1)
}
func (h *ServerStatsHandler) handleRPCOutPayload(ctx context.Context, s *stats.OutPayload) {
d, ok := ctx.Value(grpcServerRPCKey).(*rpcData)
if !ok {
if grpclog.V(2) {
grpclog.Infoln("serverHandler.handleRPCOutPayload failed to retrieve *rpcData from context")
}
return
}
ocstats.Record(ctx, RPCServerResponseBytes.M(int64(s.Length)))
atomic.AddInt64(&d.respCount, 1)
}
func (h *ServerStatsHandler) handleRPCEnd(ctx context.Context, s *stats.End) {
d, ok := ctx.Value(grpcServerRPCKey).(*rpcData)
if !ok {
if grpclog.V(2) {
grpclog.Infoln("serverHandler.handleRPCEnd failed to retrieve *rpcData from context")
}
return
}
elapsedTime := time.Since(d.startTime)
reqCount := atomic.LoadInt64(&d.reqCount)
respCount := atomic.LoadInt64(&d.respCount)
m := []ocstats.Measurement{
RPCServerRequestCount.M(reqCount),
RPCServerResponseCount.M(respCount),
RPCServerFinishedCount.M(1),
RPCServerServerElapsedTime.M(float64(elapsedTime) / float64(time.Millisecond)),
}
if s.Error != nil {
s, ok := status.FromError(s.Error)
if ok {
ctx, _ = tag.New(ctx,
tag.Upsert(KeyStatus, s.Code().String()),
)
}
m = append(m, RPCServerErrorCount.M(1))
}
ocstats.Record(ctx, m...)
}
// createTags creates a new tag map containing the tags extracted from the
// gRPC metadata.
func (h *ServerStatsHandler) createTags(ctx context.Context, fullinfo string) (context.Context, error) {
mods := []tag.Mutator{
tag.Upsert(KeyMethod, methodName(fullinfo)),
}
if tagsBin := stats.Tags(ctx); tagsBin != nil {
old, err := tag.Decode([]byte(tagsBin))
if err != nil {
return nil, fmt.Errorf("serverHandler.createTags failed to decode tagsBin %v: %v", tagsBin, err)
}
return tag.New(tag.NewContext(ctx, old), mods...)
}
return tag.New(ctx, mods...)
}