80 lines
1.6 KiB
Go
80 lines
1.6 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
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// See LICENSE for copying information.
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package main
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import (
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"bufio"
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"fmt"
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"log"
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"net"
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"sync"
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"time"
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)
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// GraphiteDest is a MetricDest that sends data with the Graphite TCP wire
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// protocol
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type GraphiteDest struct {
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address string
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mu sync.Mutex
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conn net.Conn
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buf *bufio.Writer
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stopped bool
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}
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// NewGraphiteDest creates a GraphiteDest with TCP address address. Because
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// this function is called in a Lua pipeline domain-specific language, the DSL
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// wants a graphite destination to be flushing every few seconds, so this
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// constructor will start that process. Use Close to stop it.
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func NewGraphiteDest(address string) *GraphiteDest {
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rv := &GraphiteDest{address: address}
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go rv.flush()
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return rv
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}
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// Metric implements MetricDest
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func (d *GraphiteDest) Metric(application, instance string, key []byte, val float64, ts time.Time) error {
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d.mu.Lock()
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defer d.mu.Unlock()
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if d.conn == nil {
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conn, err := net.Dial("tcp", d.address)
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if err != nil {
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return err
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}
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d.conn = conn
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d.buf = bufio.NewWriter(conn)
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}
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_, err := fmt.Fprintf(d.buf, "%s.%s.%s %v %d\n", application, instance, string(key), val, ts.Unix())
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return err
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}
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// Close stops the flushing goroutine
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func (d *GraphiteDest) Close() error {
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d.mu.Lock()
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d.stopped = true
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d.mu.Unlock()
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return nil
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}
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func (d *GraphiteDest) flush() {
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for {
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time.Sleep(5 * time.Second)
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d.mu.Lock()
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if d.stopped {
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d.mu.Unlock()
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return
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}
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var err error
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if d.buf != nil {
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err = d.buf.Flush()
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}
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d.mu.Unlock()
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if err != nil {
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log.Printf("failed flushing: %v", err)
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}
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}
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}
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