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zeusmaster.go
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zeusmaster.go
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package zeusmaster
import (
"fmt"
"net"
"os"
"os/signal"
"strconv"
"syscall"
"time"
"github.com/burke/zeus/go/clienthandler"
"github.com/burke/zeus/go/config"
"github.com/burke/zeus/go/filemonitor"
"github.com/burke/zeus/go/processtree"
slog "github.com/burke/zeus/go/shinylog"
"github.com/burke/zeus/go/statuschart"
"github.com/burke/zeus/go/zerror"
"github.com/burke/zeus/go/zeusversion"
)
const listenerPortVar = "ZEUS_NETWORK_FILE_MONITOR_PORT"
// man signal | grep 'terminate process' | awk '{print $2}' | xargs -I '{}' echo -n "syscall.{}, "
// Leaving out SIGPIPE as that is a signal the master receives if a client process is killed.
var terminatingSignals = []os.Signal{syscall.SIGHUP, syscall.SIGINT, syscall.SIGKILL, syscall.SIGALRM, syscall.SIGTERM, syscall.SIGXCPU, syscall.SIGXFSZ, syscall.SIGVTALRM, syscall.SIGPROF, syscall.SIGUSR1, syscall.SIGUSR2}
func Run(configFile string, fileChangeDelay time.Duration, simpleStatus bool) int {
slog.Colorized("{green}Starting {yellow}Z{red}e{blue}u{magenta}s{green} server v" + zeusversion.VERSION)
zerror.Init()
monitor, err := buildFileMonitor(fileChangeDelay)
if err != nil {
return 2
}
var tree = config.BuildProcessTree(configFile, monitor)
done := make(chan bool)
defer exit(processtree.StartSlaveMonitor(tree, monitor.Listen(), done), done)
defer exit(clienthandler.Start(tree, done), done)
defer monitor.Close()
defer slog.Suppress()
defer zerror.PrintFinalOutput()
defer exit(statuschart.Start(tree, done, simpleStatus), done)
c := make(chan os.Signal, 1)
signal.Notify(c, terminatingSignals...)
for {
select {
case sig := <-c:
if sig == syscall.SIGINT {
return 0
}
return 1
}
}
}
func exit(quit, done chan bool) {
// Signal the process to quit.
close(quit)
// Wait until the process signals it's done.
<-done
}
func buildFileMonitor(fileChangeDelay time.Duration) (filemonitor.FileMonitor, error) {
if portStr := os.Getenv(listenerPortVar); portStr != "" {
port, err := strconv.Atoi(portStr)
if err != nil {
return nil, fmt.Errorf("%s must be an integer or empty string: %v", listenerPortVar, err)
}
ln, err := net.ListenTCP("tcp", &net.TCPAddr{
IP: net.ParseIP("127.0.0.1"),
Port: port,
})
if err != nil {
return nil, err
}
return filemonitor.NewFileListener(fileChangeDelay, ln), nil
}
monitor, err := filemonitor.NewFileMonitor(fileChangeDelay)
if err != nil {
return nil, err
}
return monitor, nil
}