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package main
import (
"fmt"
"log"
"os"
"os/signal"
"syscall"
"github.com/gliderlabs/ssh"
)
var (
metricsNumPasswords int
metricsCityNum map[string]int
cities map[string]location
)
func main() {
// create a map mapping a city to an amount of hits
metricsCityNum = make(map[string]int)
// create a cities map mapping a city to a location
cities = make(map[string]location)
// parse flags building a config struct
config := parseFlags()
// if a state exists, load it
err := loadState(config)
if err != nil {
log.Printf("Could not load the state: %s", err)
}
// start the ssh server
log.Printf("Starting SSH listener on port %d", config.sshPort)
go func() {
sshPortString := fmt.Sprintf(":%d", config.sshPort)
listenErr := ssh.ListenAndServe(sshPortString, nil, ssh.PasswordAuth(handlePass))
if listenErr != nil {
log.Fatalln(listenErr.Error())
}
}()
// Start the exit handler handing SIGTERM syscalls
// The handler writes the state (the amount of hits processed until the
// syscall) to the statefile
exitHandler(config)
// start the http server exposing the metrics
// this is blocking
setupHTTPServer(config)
}
func exitHandler(config config) {
// relay incoming signals to the signalChannel
signalChannel := make(chan os.Signal, 2)
signal.Notify(signalChannel, os.Interrupt, syscall.SIGTERM)
// wait until a signal is given, then write the state to a file, THEN exit
go func() {
<-signalChannel
fmt.Println("Ending process... Saving the state")
// write the state to a file
err := WriteStateToFile(config)
if err != nil {
log.Printf("Error writing the stateFile: %s", err)
}
os.Exit(0)
}()
}
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