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Turn the proxy code into a library

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Allow other go programs to easily import the snowflake proxy library and
start/stop a snowflake proxy.
This commit is contained in:
idk 2021-10-25 22:51:40 -04:00 • committed by Cecylia Bocovich
parent 54ab79384f
commit 50e4f4fd61
7 changed files with 184 additions and 99 deletions
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84
proxy/util.go
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@ -1,84 +0,0 @@
package main
import (
"fmt"
"time"
)
type BytesLogger interface {
AddOutbound(int)
AddInbound(int)
ThroughputSummary() string
}
// Default BytesLogger does nothing.
type BytesNullLogger struct{}
func (b BytesNullLogger) AddOutbound(amount int) {}
func (b BytesNullLogger) AddInbound(amount int) {}
func (b BytesNullLogger) ThroughputSummary() string { return "" }
// 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++
}
}
}
func (b *BytesSyncLogger) AddOutbound(amount int) {
b.outboundChan <- amount
}
func (b *BytesSyncLogger) AddInbound(amount int) {
b.inboundChan <- amount
}
func (b *BytesSyncLogger) ThroughputSummary() string {
var inUnit, outUnit string
units := []string{"B", "KB", "MB", "GB"}
inbound := b.inbound
outbound := b.outbound
for i, u := range units {
inUnit = u
if (inbound < 1000) || (i == len(units)-1) {
break
}
inbound = inbound / 1000
}
for i, u := range units {
outUnit = u
if (outbound < 1000) || (i == len(units)-1) {
break
}
outbound = outbound / 1000
}
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()))
}