Merge pull request #739 from rjnagal/docker

Initial client library for statsd backend.
This commit is contained in:
Victor Marmol 2015-05-28 09:28:40 -07:00
commit 3b86581556

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storage/statsd/client.go Normal file
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// Copyright 2015 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 (
"fmt"
"net"
"github.com/golang/glog"
)
type Client struct {
HostPort string
conn net.Conn
}
func (self *Client) Open() error {
conn, err := net.Dial("udp", self.HostPort)
if err != nil {
glog.Errorf("failed to open udp connection to %q: %v", self.HostPort, err)
return err
}
self.conn = conn
return nil
}
func (self *Client) Close() {
self.conn.Close()
}
func (self *Client) UpdateGauge(name, value string) error {
stats := make(map[string]string)
val := fmt.Sprintf("%s|g", value)
stats[name] = val
if err := self.send(stats); err != nil {
return err
}
return nil
}
// Simple send to statsd daemon without sampling.
func (self *Client) send(data map[string]string) error {
for k, v := range data {
formatted := fmt.Sprintf("%s:%s", k, v)
_, err := fmt.Fprintf(self.conn, formatted)
if err != nil {
glog.V(3).Infof("failed to send data %q: %v", formatted, err)
// return on first error.
return err
}
}
return nil
}
func New(hostPort string) (*Client, error) {
client := Client{HostPort: hostPort}
if err := client.Open(); err != nil {
return nil, err
}
return &client, nil
}