/
filter.go
118 lines (105 loc) · 3.4 KB
/
filter.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
// 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 apmrestful // import "go.elastic.co/apm/module/apmrestful/v2"
import (
"net/http"
restful "github.com/emicklei/go-restful/v3"
"go.elastic.co/apm/module/apmhttp/v2"
"go.elastic.co/apm/v2"
)
// Filter returns a new restful.Filter for tracing requests
// and recovering and reporting panics to Elastic APM.
//
// By default, the filter will use apm.DefaultTracer().
// Use WithTracer to specify an alternative tracer.
func Filter(o ...Option) restful.FilterFunction {
opts := options{
tracer: apm.DefaultTracer(),
}
for _, o := range o {
o(&opts)
}
if opts.requestIgnorer == nil {
opts.requestIgnorer = apmhttp.NewDynamicServerRequestIgnorer(opts.tracer)
}
return (&filter{
tracer: opts.tracer,
requestIgnorer: opts.requestIgnorer,
}).filter
}
type filter struct {
tracer *apm.Tracer
requestIgnorer apmhttp.RequestIgnorerFunc
}
func (f *filter) filter(req *restful.Request, resp *restful.Response, chain *restful.FilterChain) {
if !f.tracer.Recording() || f.requestIgnorer(req.Request) {
chain.ProcessFilter(req, resp)
return
}
var name string
if routePath := massageRoutePath(req.SelectedRoutePath()); routePath != "" {
name = req.Request.Method + " " + massageRoutePath(req.SelectedRoutePath())
} else {
name = apmhttp.UnknownRouteRequestName(req.Request)
}
tx, body, httpRequest := apmhttp.StartTransactionWithBody(f.tracer, name, req.Request)
defer tx.End()
req.Request = httpRequest
const frameworkName = "go-restful"
const frameworkVersion = ""
if tx.Sampled() {
tx.Context.SetFramework(frameworkName, frameworkVersion)
}
origResponseWriter := resp.ResponseWriter
w, httpResp := apmhttp.WrapResponseWriter(origResponseWriter)
resp.ResponseWriter = w
defer func() {
resp.ResponseWriter = origResponseWriter
if v := recover(); v != nil {
if httpResp.StatusCode == 0 {
w.WriteHeader(http.StatusInternalServerError)
}
e := f.tracer.Recovered(v)
e.SetTransaction(tx)
apmhttp.SetContext(&e.Context, req.Request, httpResp, body)
e.Context.SetFramework(frameworkName, frameworkVersion)
e.Send()
}
apmhttp.SetTransactionContext(tx, req.Request, httpResp, body)
body.Discard()
}()
chain.ProcessFilter(req, resp)
if httpResp.StatusCode == 0 {
httpResp.StatusCode = http.StatusOK
}
}
type options struct {
tracer *apm.Tracer
requestIgnorer apmhttp.RequestIgnorerFunc
}
// Option sets options for tracing.
type Option func(*options)
// WithTracer returns an Option which sets t as the tracer
// to use for tracing server requests.
func WithTracer(t *apm.Tracer) Option {
if t == nil {
panic("t == nil")
}
return func(o *options) {
o.tracer = t
}
}