proxy.lib.util.go Maven / Gradle / Ivy
package snowflake_proxy
import (
"fmt"
"time"
)
// bytesLogger is an interface which is used to allow logging the throughput
// of the Snowflake. A default bytesLogger(bytesNullLogger) does nothing.
type bytesLogger interface {
AddOutbound(int)
AddInbound(int)
ThroughputSummary() string
GetStat() (in int, out int)
}
// bytesNullLogger Default bytesLogger does nothing.
type bytesNullLogger struct{}
// AddOutbound in bytesNullLogger does nothing
func (b bytesNullLogger) AddOutbound(amount int) {}
// AddInbound in bytesNullLogger does nothing
func (b bytesNullLogger) AddInbound(amount int) {}
// ThroughputSummary in bytesNullLogger does nothing
func (b bytesNullLogger) ThroughputSummary() string { return "" }
func (b bytesNullLogger) GetStat() (in int, out int) { return -1, -1 }
// bytesSyncLogger uses channels to safely log from multiple sources with output
// occuring at reasonable intervals.
type bytesSyncLogger struct {
outboundChan, inboundChan chan int
outbound, inbound, outEvents, inEvents int
start time.Time
}
// newBytesSyncLogger returns a new bytesSyncLogger and starts it loggin.
func newBytesSyncLogger() *bytesSyncLogger {
b := &bytesSyncLogger{
outboundChan: make(chan int, 5),
inboundChan: make(chan int, 5),
}
go b.log()
b.start = time.Now()
return b
}
func (b *bytesSyncLogger) log() {
for {
select {
case amount := <-b.outboundChan:
b.outbound += amount
b.outEvents++
case amount := <-b.inboundChan:
b.inbound += amount
b.inEvents++
}
}
}
// AddOutbound add a number of bytes to the outbound total reported by the logger
func (b *bytesSyncLogger) AddOutbound(amount int) {
b.outboundChan <- amount
}
// AddInbound add a number of bytes to the inbound total reported by the logger
func (b *bytesSyncLogger) AddInbound(amount int) {
b.inboundChan <- amount
}
// ThroughputSummary view a formatted summary of the throughput totals
func (b *bytesSyncLogger) ThroughputSummary() string {
inbound := b.inbound
outbound := b.outbound
inbound, inUnit := formatTraffic(inbound)
outbound, outUnit := formatTraffic(outbound)
t := time.Now()
return fmt.Sprintf("Traffic throughput (up|down): %d %s|%d %s -- (%d OnMessages, %d Sends, over %d seconds)", inbound, inUnit, outbound, outUnit, b.outEvents, b.inEvents, int(t.Sub(b.start).Seconds()))
}
func (b *bytesSyncLogger) GetStat() (in int, out int) { return b.inbound, b.outbound }
func formatTraffic(amount int) (value int, unit string) {
value = amount
units := []string{"B", "KB", "MB", "GB"}
for i, u := range units {
unit = u
if (value < 1000) || (i == len(units)-1) {
break
}
value = value / 1000
}
return
}