-
Notifications
You must be signed in to change notification settings - Fork 329
/
handler.go
61 lines (50 loc) · 1.61 KB
/
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
// Copyright (C) 2017 Google Inc.
//
// 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 log
import (
"context"
"github.com/google/gapid/core/context/keys"
)
// Handler is the handler of log messages.
type Handler interface {
Handle(*Message)
Close()
}
// handler is a simple implementation of the Handler interface
type handler struct {
handle func(*Message)
close func()
}
func (h handler) Handle(m *Message) { h.handle(m) }
func (h handler) Close() {
if h.close != nil {
h.close()
}
}
// NewHandler returns a Handler that calls handle for each message and close
// when the handler is closed. close can be nil.
func NewHandler(handle func(*Message), close func()) Handler {
return &handler{handle, close}
}
type handlerKeyTy string
const handlerKey handlerKeyTy = "log.handlerKey"
// PutHandler returns a new context with the Handler assigned to w.
func PutHandler(ctx context.Context, w Handler) context.Context {
return keys.WithValue(ctx, handlerKey, w)
}
// GetHandler returns the Handler assigned to ctx.
func GetHandler(ctx context.Context) Handler {
out, _ := ctx.Value(handlerKey).(Handler)
return out
}