101 lines
2.2 KiB
Go
101 lines
2.2 KiB
Go
package metrics
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"os/signal"
|
|
"sync"
|
|
"syscall"
|
|
)
|
|
|
|
// InmemSignal is used to listen for a given signal, and when received,
|
|
// to dump the current metrics from the InmemSink to an io.Writer
|
|
type InmemSignal struct {
|
|
signal syscall.Signal
|
|
inm *InmemSink
|
|
w io.Writer
|
|
sigCh chan os.Signal
|
|
|
|
stop bool
|
|
stopCh chan struct{}
|
|
stopLock sync.Mutex
|
|
}
|
|
|
|
// NewInmemSignal creates a new InmemSignal which listens for a given signal,
|
|
// and dumps the current metrics out to a writer
|
|
func NewInmemSignal(inmem *InmemSink, sig syscall.Signal, w io.Writer) *InmemSignal {
|
|
i := &InmemSignal{
|
|
signal: sig,
|
|
inm: inmem,
|
|
w: w,
|
|
sigCh: make(chan os.Signal, 1),
|
|
stopCh: make(chan struct{}),
|
|
}
|
|
signal.Notify(i.sigCh, sig)
|
|
go i.run()
|
|
return i
|
|
}
|
|
|
|
// DefaultInmemSignal returns a new InmemSignal that responds to SIGUSR1
|
|
// and writes output to stderr. Windows uses SIGBREAK
|
|
func DefaultInmemSignal(inmem *InmemSink) *InmemSignal {
|
|
return NewInmemSignal(inmem, DefaultSignal, os.Stderr)
|
|
}
|
|
|
|
// Stop is used to stop the InmemSignal from listening
|
|
func (i *InmemSignal) Stop() {
|
|
i.stopLock.Lock()
|
|
defer i.stopLock.Unlock()
|
|
|
|
if i.stop {
|
|
return
|
|
}
|
|
i.stop = true
|
|
close(i.stopCh)
|
|
signal.Stop(i.sigCh)
|
|
}
|
|
|
|
// run is a long running routine that handles signals
|
|
func (i *InmemSignal) run() {
|
|
for {
|
|
select {
|
|
case <-i.sigCh:
|
|
i.dumpStats()
|
|
case <-i.stopCh:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// dumpStats is used to dump the data to output writer
|
|
func (i *InmemSignal) dumpStats() {
|
|
buf := bytes.NewBuffer(nil)
|
|
|
|
data := i.inm.Data()
|
|
// Skip the last period which is still being aggregated
|
|
for i := 0; i < len(data)-1; i++ {
|
|
intv := data[i]
|
|
intv.RLock()
|
|
for name, val := range intv.Gauges {
|
|
fmt.Fprintf(buf, "[%v][G] '%s': %0.3f\n", intv.Interval, name, val)
|
|
}
|
|
for name, vals := range intv.Points {
|
|
for _, val := range vals {
|
|
fmt.Fprintf(buf, "[%v][P] '%s': %0.3f\n", intv.Interval, name, val)
|
|
}
|
|
}
|
|
for name, agg := range intv.Counters {
|
|
fmt.Fprintf(buf, "[%v][C] '%s': %s\n", intv.Interval, name, agg)
|
|
}
|
|
for name, agg := range intv.Samples {
|
|
fmt.Fprintf(buf, "[%v][S] '%s': %s\n", intv.Interval, name, agg)
|
|
}
|
|
intv.RUnlock()
|
|
}
|
|
|
|
// Write out the bytes
|
|
i.w.Write(buf.Bytes())
|
|
}
|