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buffer.go
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buffer.go
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package statsd
type bufferFullError string
func (e bufferFullError) Error() string { return string(e) }
const errBufferFull = bufferFullError("statsd buffer is full")
const metricOverhead = 512
// statsdBuffer is a buffer containing statsd messages
// this struct methods are NOT safe for concurent use
type statsdBuffer struct {
buffer []byte
maxSize int
maxElements int
elementCount int
}
func newStatsdBuffer(maxSize, maxElements int) *statsdBuffer {
return &statsdBuffer{
buffer: make([]byte, 0, maxSize+metricOverhead), // pre-allocate the needed size + metricOverhead to avoid having Go re-allocate on it's own if an element does not fit
maxSize: maxSize,
maxElements: maxElements,
}
}
func (b *statsdBuffer) writeGauge(namespace string, globalTags []string, name string, value float64, tags []string, rate float64) error {
if b.elementCount >= b.maxElements {
return errBufferFull
}
originalBuffer := b.buffer
b.writeSeparator()
b.buffer = appendGauge(b.buffer, namespace, globalTags, name, value, tags, rate)
return b.validateNewElement(originalBuffer)
}
func (b *statsdBuffer) writeCount(namespace string, globalTags []string, name string, value int64, tags []string, rate float64) error {
if b.elementCount >= b.maxElements {
return errBufferFull
}
originalBuffer := b.buffer
b.writeSeparator()
b.buffer = appendCount(b.buffer, namespace, globalTags, name, value, tags, rate)
return b.validateNewElement(originalBuffer)
}
func (b *statsdBuffer) writeHistogram(namespace string, globalTags []string, name string, value float64, tags []string, rate float64) error {
if b.elementCount >= b.maxElements {
return errBufferFull
}
originalBuffer := b.buffer
b.writeSeparator()
b.buffer = appendHistogram(b.buffer, namespace, globalTags, name, value, tags, rate)
return b.validateNewElement(originalBuffer)
}
func (b *statsdBuffer) writeDistribution(namespace string, globalTags []string, name string, value float64, tags []string, rate float64) error {
if b.elementCount >= b.maxElements {
return errBufferFull
}
originalBuffer := b.buffer
b.writeSeparator()
b.buffer = appendDistribution(b.buffer, namespace, globalTags, name, value, tags, rate)
return b.validateNewElement(originalBuffer)
}
func (b *statsdBuffer) writeSet(namespace string, globalTags []string, name string, value string, tags []string, rate float64) error {
if b.elementCount >= b.maxElements {
return errBufferFull
}
originalBuffer := b.buffer
b.writeSeparator()
b.buffer = appendSet(b.buffer, namespace, globalTags, name, value, tags, rate)
return b.validateNewElement(originalBuffer)
}
func (b *statsdBuffer) writeTiming(namespace string, globalTags []string, name string, value float64, tags []string, rate float64) error {
if b.elementCount >= b.maxElements {
return errBufferFull
}
originalBuffer := b.buffer
b.writeSeparator()
b.buffer = appendTiming(b.buffer, namespace, globalTags, name, value, tags, rate)
return b.validateNewElement(originalBuffer)
}
func (b *statsdBuffer) writeEvent(event Event, globalTags []string) error {
if b.elementCount >= b.maxElements {
return errBufferFull
}
originalBuffer := b.buffer
b.writeSeparator()
b.buffer = appendEvent(b.buffer, event, globalTags)
return b.validateNewElement(originalBuffer)
}
func (b *statsdBuffer) writeServiceCheck(serviceCheck ServiceCheck, globalTags []string) error {
if b.elementCount >= b.maxElements {
return errBufferFull
}
originalBuffer := b.buffer
b.writeSeparator()
b.buffer = appendServiceCheck(b.buffer, serviceCheck, globalTags)
return b.validateNewElement(originalBuffer)
}
func (b *statsdBuffer) validateNewElement(originalBuffer []byte) error {
if len(b.buffer) > b.maxSize {
b.buffer = originalBuffer
return errBufferFull
}
b.elementCount++
return nil
}
func (b *statsdBuffer) writeSeparator() {
if b.elementCount != 0 {
b.buffer = appendSeparator(b.buffer)
}
}
func (b *statsdBuffer) reset() {
b.buffer = b.buffer[:0]
b.elementCount = 0
}
func (b *statsdBuffer) bytes() []byte {
return b.buffer
}