b7ee40566c
Restricted to supporting just gauges now as counters or timing are not very useful for cAdvisor.
74 lines
1.7 KiB
Go
74 lines
1.7 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package statsd
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import (
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"fmt"
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"net"
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"github.com/golang/glog"
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)
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type Client struct {
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HostPort string
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conn net.Conn
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}
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func (self *Client) Open() error {
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conn, err := net.Dial("udp", self.HostPort)
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if err != nil {
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glog.Errorf("failed to open udp connection to %q: %v", self.HostPort, err)
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return err
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}
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self.conn = conn
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return nil
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}
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func (self *Client) Close() {
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self.conn.Close()
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}
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func (self *Client) UpdateGauge(name, value string) error {
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stats := make(map[string]string)
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val := fmt.Sprintf("%s|g", value)
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stats[name] = val
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if err := self.send(stats); err != nil {
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return err
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}
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return nil
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}
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// Simple send to statsd daemon without sampling.
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func (self *Client) send(data map[string]string) error {
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for k, v := range data {
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formatted := fmt.Sprintf("%s:%s", k, v)
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_, err := fmt.Fprintf(self.conn, formatted)
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if err != nil {
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glog.V(3).Infof("failed to send data %q: %v", formatted, err)
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// return on first error.
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return err
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}
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}
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return nil
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}
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func New(hostPort string) (*Client, error) {
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client := Client{HostPort: hostPort}
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if err := client.Open(); err != nil {
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return nil, err
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}
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return &client, nil
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}
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