diff options
Diffstat (limited to 'vendor/github.com/armon/go-metrics/statsd.go')
-rw-r--r-- | vendor/github.com/armon/go-metrics/statsd.go | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/vendor/github.com/armon/go-metrics/statsd.go b/vendor/github.com/armon/go-metrics/statsd.go new file mode 100644 index 000000000..65a5021a0 --- /dev/null +++ b/vendor/github.com/armon/go-metrics/statsd.go @@ -0,0 +1,154 @@ +package metrics + +import ( + "bytes" + "fmt" + "log" + "net" + "strings" + "time" +) + +const ( + // statsdMaxLen is the maximum size of a packet + // to send to statsd + statsdMaxLen = 1400 +) + +// StatsdSink provides a MetricSink that can be used +// with a statsite or statsd metrics server. It uses +// only UDP packets, while StatsiteSink uses TCP. +type StatsdSink struct { + addr string + metricQueue chan string +} + +// NewStatsdSink is used to create a new StatsdSink +func NewStatsdSink(addr string) (*StatsdSink, error) { + s := &StatsdSink{ + addr: addr, + metricQueue: make(chan string, 4096), + } + go s.flushMetrics() + return s, nil +} + +// Close is used to stop flushing to statsd +func (s *StatsdSink) Shutdown() { + close(s.metricQueue) +} + +func (s *StatsdSink) SetGauge(key []string, val float32) { + flatKey := s.flattenKey(key) + s.pushMetric(fmt.Sprintf("%s:%f|g\n", flatKey, val)) +} + +func (s *StatsdSink) EmitKey(key []string, val float32) { + flatKey := s.flattenKey(key) + s.pushMetric(fmt.Sprintf("%s:%f|kv\n", flatKey, val)) +} + +func (s *StatsdSink) IncrCounter(key []string, val float32) { + flatKey := s.flattenKey(key) + s.pushMetric(fmt.Sprintf("%s:%f|c\n", flatKey, val)) +} + +func (s *StatsdSink) AddSample(key []string, val float32) { + flatKey := s.flattenKey(key) + s.pushMetric(fmt.Sprintf("%s:%f|ms\n", flatKey, val)) +} + +// Flattens the key for formatting, removes spaces +func (s *StatsdSink) flattenKey(parts []string) string { + joined := strings.Join(parts, ".") + return strings.Map(func(r rune) rune { + switch r { + case ':': + fallthrough + case ' ': + return '_' + default: + return r + } + }, joined) +} + +// Does a non-blocking push to the metrics queue +func (s *StatsdSink) pushMetric(m string) { + select { + case s.metricQueue <- m: + default: + } +} + +// Flushes metrics +func (s *StatsdSink) flushMetrics() { + var sock net.Conn + var err error + var wait <-chan time.Time + ticker := time.NewTicker(flushInterval) + defer ticker.Stop() + +CONNECT: + // Create a buffer + buf := bytes.NewBuffer(nil) + + // Attempt to connect + sock, err = net.Dial("udp", s.addr) + if err != nil { + log.Printf("[ERR] Error connecting to statsd! Err: %s", err) + goto WAIT + } + + for { + select { + case metric, ok := <-s.metricQueue: + // Get a metric from the queue + if !ok { + goto QUIT + } + + // Check if this would overflow the packet size + if len(metric)+buf.Len() > statsdMaxLen { + _, err := sock.Write(buf.Bytes()) + buf.Reset() + if err != nil { + log.Printf("[ERR] Error writing to statsd! Err: %s", err) + goto WAIT + } + } + + // Append to the buffer + buf.WriteString(metric) + + case <-ticker.C: + if buf.Len() == 0 { + continue + } + + _, err := sock.Write(buf.Bytes()) + buf.Reset() + if err != nil { + log.Printf("[ERR] Error flushing to statsd! Err: %s", err) + goto WAIT + } + } + } + +WAIT: + // Wait for a while + wait = time.After(time.Duration(5) * time.Second) + for { + select { + // Dequeue the messages to avoid backlog + case _, ok := <-s.metricQueue: + if !ok { + goto QUIT + } + case <-wait: + goto CONNECT + } + } +QUIT: + s.metricQueue = nil +} |