forked from Stackdriver/heapster
/
statsd_client.go
95 lines (87 loc) · 2.38 KB
/
statsd_client.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
// Copyright 2016 Google Inc. All Rights Reserved.
//
// 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 statsd
import (
"bytes"
"fmt"
"github.com/golang/glog"
"net"
)
type statsdClient interface {
open() error
close() error
send(messages []string) error
}
type statsdClientImpl struct {
host string
numMetricsPerMsg int
conn net.Conn
}
func (client *statsdClientImpl) open() error {
var err error
client.conn, err = net.Dial("udp", client.host)
if err != nil {
glog.Errorf("Failed to open statsd client connection : %v", err)
} else {
glog.V(2).Infof("statsd client connection opened : %+v", client.conn)
}
return err
}
func (client *statsdClientImpl) close() error {
if client.conn == nil {
glog.Info("statsd client connection already closed")
return nil
}
err := client.conn.Close()
client.conn = nil
glog.V(2).Infof("statsd client connection closed")
return err
}
func (client *statsdClientImpl) send(messages []string) error {
if client.conn == nil {
err := client.open()
if err != nil {
return fmt.Errorf("send() failed - %v", err)
}
}
var numMetrics = 0
var err, tmpErr error
buf := bytes.NewBufferString("")
for _, msg := range messages {
buf.WriteString(fmt.Sprintf("%s\n", msg))
numMetrics++
if numMetrics >= client.numMetricsPerMsg {
_, tmpErr = client.conn.Write(buf.Bytes())
if tmpErr != nil {
err = tmpErr
}
buf.Reset()
numMetrics = 0
}
}
if buf.Len() > 0 {
_, tmpErr = client.conn.Write(buf.Bytes())
if tmpErr != nil {
err = tmpErr
}
}
return err
}
func NewStatsdClient(host string, numMetricsPerMsg int) (client statsdClient, err error) {
if numMetricsPerMsg <= 0 {
return nil, fmt.Errorf("numMetricsPerMsg should be a positive integer : %d", numMetricsPerMsg)
}
glog.V(2).Infof("statsd client created")
return &statsdClientImpl{host: host, numMetricsPerMsg: numMetricsPerMsg}, nil
}