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runtime_emitter.go
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runtime_emitter.go
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package runtimeemitter
import (
"runtime"
"time"
"code.cloudfoundry.org/go-loggregator"
)
// Emitter will emit a gauge with runtime stats via the sender on the given
// interval. default interval is 15 seconds.
type Emitter struct {
interval time.Duration
sender valueSender
// sender Sender
}
type valueSender interface {
send(heap, stack, gc, goroutines float64)
}
// Sender is the interface of the client that can be used to emit gauge
// metrics.
type Sender interface {
EmitGauge(opts ...loggregator.EmitGaugeOption)
}
// RuntimeEmitterOption is the option provides configuration for an Emitter.
type RuntimeEmitterOption func(e *Emitter)
// WithInterval returns a RuntimeEmitterOption to configure the interval at
// which the runtime emitter emits gauges.
func WithInterval(d time.Duration) RuntimeEmitterOption {
return func(e *Emitter) {
e.interval = d
}
}
// New returns an Emitter that is configured with the given sender and
// RuntimeEmitterOptions.
func New(sender Sender, opts ...RuntimeEmitterOption) *Emitter {
e := &Emitter{
sender: v2Sender{sender: sender},
interval: 10 * time.Second,
}
for _, o := range opts {
o(e)
}
return e
}
// Sender is the interface of the v1 client that can be used to emit value
// metrics.
type V1Sender interface {
SendComponentMetric(name string, value float64, unit string) error
}
// New returns an Emitter that is configured with the given v1 sender and
// RuntimeEmitterOptions.
func NewV1(sender V1Sender, opts ...RuntimeEmitterOption) *Emitter {
e := &Emitter{
sender: v1Sender{sender: sender},
interval: 10 * time.Second,
}
for _, o := range opts {
o(e)
}
return e
}
// Run starts the ticker with the configured interval and emits a gauge on
// that interval. This method will block but the user may run in a go routine.
func (e *Emitter) Run() {
for range time.Tick(e.interval) {
memstats := &runtime.MemStats{}
runtime.ReadMemStats(memstats)
e.sender.send(
float64(memstats.HeapAlloc),
float64(memstats.StackInuse),
float64(memstats.PauseNs[(memstats.NumGC+255)%256]),
float64(runtime.NumGoroutine()),
)
}
}
type v2Sender struct {
sender Sender
}
func (s v2Sender) send(heap, stack, gc, goroutines float64) {
s.sender.EmitGauge(
loggregator.WithGaugeValue("memoryStats.numBytesAllocatedHeap", heap, "Bytes"),
loggregator.WithGaugeValue("memoryStats.numBytesAllocatedStack", stack, "Bytes"),
loggregator.WithGaugeValue("memoryStats.lastGCPauseTimeNS", gc, "ns"),
loggregator.WithGaugeValue("numGoRoutines", goroutines, "Count"),
)
}
type v1Sender struct {
sender V1Sender
}
func (s v1Sender) send(heap, stack, gc, goroutines float64) {
s.sender.SendComponentMetric("memoryStats.numBytesAllocatedHeap", heap, "Bytes")
s.sender.SendComponentMetric("memoryStats.numBytesAllocatedStack", stack, "Bytes")
s.sender.SendComponentMetric("memoryStats.lastGCPauseTimeNS", gc, "ns")
s.sender.SendComponentMetric("numGoRoutines", goroutines, "Count")
}