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supervisor.go
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supervisor.go
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/*
udpserial - lightweight bridge for serial ports over UDP packets
Copyright (C) 2022 Giacomo De Lazzari
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"strconv"
"sync"
"time"
)
var stopChannel chan string
var killChannels map[string](chan bool)
var doNotRestart bool
var diedCount int
var restarting bool
func rebuildStatistics() {
statistics.PortsMutex.Lock()
statistics.Ports = make(map[string]*PortStatistics)
for _, portConfig := range config.Ports {
statistics.Ports[portConfig.Name] = &PortStatistics{}
}
statistics.PortsMutex.Unlock()
}
func startAndSuperviseThreads(wg *sync.WaitGroup) {
defer wg.Done()
logger("supervisor", LogInfo, "Starting threads")
restarting = false
doNotRestart = false
diedCount = 0
stopChannel = make(chan string)
killChannels = make(map[string](chan bool))
rebuildStatistics()
for _, portConfig := range config.Ports {
name := "UDPSerialThread_" + portConfig.Name
killChannels[portConfig.Name] = make(chan bool)
go UDPSerialThread(name, portConfig, stopChannel, killChannels[portConfig.Name], statistics.Ports[portConfig.Name])
}
// Start supervising
for {
var diedPortName = <-stopChannel
diedCount++
if doNotRestart == false {
portConfig, err := getPortConfig(config, diedPortName)
if err != nil {
logger("supervisor", LogError, err)
}
// Relaunch thread
name := "UDPSerialThread_" + portConfig.Name
killChannels[portConfig.Name] = make(chan bool)
go UDPSerialThread(name, portConfig, stopChannel, killChannels[portConfig.Name], statistics.Ports[portConfig.Name])
// Wait a bit
time.Sleep(time.Second * 1)
}
}
}
func stopAllThreads() {
if restarting == true {
return
}
restarting = true
doNotRestart = true
diedCount = 0
mustDie := len(killChannels)
logger("supervisor", LogInfo, "Waiting for "+strconv.Itoa(mustDie)+" threads to stop")
for portName := range killChannels {
select {
case killChannels[portName] <- true:
case <-time.After(1*time.Second + time.Millisecond*250):
}
}
for {
if diedCount >= mustDie {
break
}
time.Sleep(time.Millisecond * 10)
}
doNotRestart = false
logger("supervisor", LogInfo, "All threads stopped")
}
func restartAllThreads() {
logger("supervisor", LogInfo, "Thread restart requested")
if restarting == true {
logger("supervisor", LogInfo, "Already restarting threads")
return
}
stopAllThreads()
restarting = true
logger("supervisor", LogInfo, "Restarting threads")
killChannels = make(map[string](chan bool))
rebuildStatistics()
for _, portConfig := range config.Ports {
name := "UDPSerialThread_" + portConfig.Name
killChannels[portConfig.Name] = make(chan bool)
go UDPSerialThread(name, portConfig, stopChannel, killChannels[portConfig.Name], statistics.Ports[portConfig.Name])
}
restarting = false
}