/
server.go
148 lines (124 loc) · 3.99 KB
/
server.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
// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 apmfasthttp // import "go.elastic.co/apm/module/apmfasthttp/v2"
import (
"github.com/valyala/fasthttp"
"go.elastic.co/apm/v2"
)
// Wrap returns a fasthttp.RequestHandler wrapping handler, reporting each request as
// a transaction to Elastic APM.
//
// By default, the returned RequestHandler will use apm.DefaultTracer().
// Use WithTracer to specify an alternative tracer.
//
// By default, the returned RequestHandler will recover panics, reporting
// them to the configured tracer. To override this behaviour, use
// WithRecovery.
func Wrap(handler fasthttp.RequestHandler, options ...ServerOption) fasthttp.RequestHandler {
h := new(apmHandler)
h.requestHandler = handler
for i := range options {
options[i](h)
}
if h.tracer == nil {
h.tracer = apm.DefaultTracer()
}
if h.requestName == nil {
h.requestName = ServerRequestName
}
if h.requestIgnorer == nil {
h.requestIgnorer = NewDynamicServerRequestIgnorer(h.tracer)
}
if h.recovery == nil {
h.recovery = NewTraceRecovery(h.tracer)
}
return h.handler
}
func (h *apmHandler) handler(ctx *fasthttp.RequestCtx) {
if !h.tracer.Recording() || h.requestIgnorer(ctx) {
h.requestHandler(ctx)
return
}
tx, bc, err := StartTransactionWithBody(ctx, h.tracer, h.requestName(ctx))
if err != nil {
ctx.Error(err.Error(), fasthttp.StatusInternalServerError)
return
}
defer func() {
if err := recover(); err != nil {
if h.panicPropagation {
defer panic(err)
}
// 500 status code will be set only for APM transaction
// to allow other middleware to choose a different response code
if ctx.Response.Header.StatusCode() == fasthttp.StatusOK {
ctx.Response.Header.SetStatusCode(fasthttp.StatusInternalServerError)
}
h.recovery(ctx, tx, bc, err)
}
}()
h.requestHandler(ctx)
}
// WithTracer returns a ServerOption which sets t as the tracer
// to use for tracing server requests.
func WithTracer(t *apm.Tracer) ServerOption {
if t == nil {
panic("t == nil")
}
return func(h *apmHandler) {
h.tracer = t
}
}
// WithServerRequestName returns a ServerOption which sets fn as the function
// to use to obtain the transaction name for the given server request.
func WithServerRequestName(fn RequestNameFunc) ServerOption {
if fn == nil {
panic("fn == nil")
}
return func(h *apmHandler) {
h.requestName = fn
}
}
// WithServerRequestIgnorer returns a ServerOption which sets fn as the
// function to use to determine whether or not a server request should
// be ignored. If request ignorer is nil, all requests will be reported.
func WithServerRequestIgnorer(fn RequestIgnorerFunc) ServerOption {
if fn == nil {
panic("fn == nil")
}
return func(h *apmHandler) {
h.requestIgnorer = fn
}
}
// WithRecovery returns a ServerOption which sets r as the recovery
// function to use for tracing server requests.
func WithRecovery(r RecoveryFunc) ServerOption {
if r == nil {
panic("r == nil")
}
return func(h *apmHandler) {
h.recovery = r
}
}
// WithPanicPropagation returns a ServerOption which enable panic propagation.
// Any panic will be recovered and recorded as an error in a transaction, then
// panic will be caused again.
func WithPanicPropagation() ServerOption {
return func(h *apmHandler) {
h.panicPropagation = true
}
}