/
zpagesextension.go
75 lines (63 loc) · 1.88 KB
/
zpagesextension.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
// Copyright The OpenTelemetry 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 zpagesextension
import (
"context"
"net"
"net/http"
"go.opencensus.io/zpages"
"go.uber.org/zap"
"go.opentelemetry.io/collector/component"
)
type zpagesExtension struct {
config Config
logger *zap.Logger
server http.Server
}
func (zpe *zpagesExtension) Start(_ context.Context, host component.Host) error {
zPagesMux := http.NewServeMux()
zpages.Handle(zPagesMux, "/debug")
hostZPages, ok := host.(interface {
RegisterZPages(mux *http.ServeMux, pathPrefix string)
})
if ok {
zpe.logger.Info("Register Host's zPages")
hostZPages.RegisterZPages(zPagesMux, "/debug")
} else {
zpe.logger.Info("Host's zPages not available")
}
// Start the listener here so we can have earlier failure if port is
// already in use.
ln, err := net.Listen("tcp", zpe.config.Endpoint)
if err != nil {
return err
}
zpe.logger.Info("Starting zPages extension", zap.Any("config", zpe.config))
zpe.server = http.Server{Handler: zPagesMux}
go func() {
if err := zpe.server.Serve(ln); err != nil && err != http.ErrServerClosed {
host.ReportFatalError(err)
}
}()
return nil
}
func (zpe *zpagesExtension) Shutdown(context.Context) error {
return zpe.server.Close()
}
func newServer(config Config, logger *zap.Logger) *zpagesExtension {
return &zpagesExtension{
config: config,
logger: logger,
}
}