cityuni-webserver/cmd/wappcityuni/main.go

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package main
import (
"fmt"
"github.com/joho/godotenv"
"golang.captainalm.com/cityuni-webserver/conf"
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"golang.captainalm.com/cityuni-webserver/pageHandler"
"gopkg.in/yaml.v3"
"log"
"net"
"net/http"
"os"
"os/signal"
"path"
"path/filepath"
"strings"
"sync"
"syscall"
"time"
)
var (
buildVersion = "develop"
buildDate = ""
)
func main() {
log.Printf("[Main] Starting up GO Package Header Server #%s (%s)\n", buildVersion, buildDate)
y := time.Now()
//Hold main thread till safe shutdown exit:
wg := &sync.WaitGroup{}
wg.Add(1)
//Get working directory:
cwdDir, err := os.Getwd()
if err != nil {
log.Println(err)
}
//Load environment file:
err = godotenv.Load()
if err != nil {
log.Fatalln("Error loading .env file")
}
//Data directory processing:
dataDir := os.Getenv("DIR_DATA")
if dataDir == "" {
dataDir = path.Join(cwdDir, ".data")
}
check(os.MkdirAll(dataDir, 0777))
//Config file processing:
configLocation := os.Getenv("CONFIG_FILE")
if configLocation == "" {
configLocation = path.Join(dataDir, "config.yml")
} else {
if !filepath.IsAbs(configLocation) {
configLocation = path.Join(dataDir, configLocation)
}
}
//Config loading:
configFile, err := os.Open(configLocation)
if err != nil {
log.Fatalln("Failed to open config.yml")
}
var configYml conf.ConfigYaml
groupsDecoder := yaml.NewDecoder(configFile)
err = groupsDecoder.Decode(&configYml)
if err != nil {
log.Fatalln("Failed to parse config.yml:", err)
}
//Server definitions:
var webServer *http.Server
var fcgiListen net.Listener
switch strings.ToLower(configYml.Listen.WebMethod) {
case "http":
webServer = &http.Server{Handler: pageHandler.GetRouter(configYml)}
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go runBackgroundHttp(webServer, getListener(configYml, cwdDir), false)
case "fcgi":
fcgiListen = getListener(configYml, cwdDir)
if fcgiListen == nil {
log.Fatalln("Listener Nil")
} else {
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go runBackgroundFCgi(pageHandler.GetRouter(configYml), fcgiListen)
}
default:
log.Fatalln("Unknown Web Method.")
}
//=====================
// Safe shutdown
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
//Startup complete:
z := time.Now().Sub(y)
log.Printf("[Main] Took '%s' to fully initialize modules\n", z.String())
go func() {
<-sigs
fmt.Printf("\n")
log.Printf("[Main] Attempting safe shutdown\n")
a := time.Now()
if webServer != nil {
log.Printf("[Main] Shutting down HTTP server...\n")
err := webServer.Close()
if err != nil {
log.Println(err)
}
}
if fcgiListen != nil {
log.Printf("[Main] Shutting down FCGI server...\n")
err := fcgiListen.Close()
if err != nil {
log.Println(err)
}
}
log.Printf("[Main] Signalling program exit...\n")
b := time.Now().Sub(a)
log.Printf("[Main] Took '%s' to fully shutdown modules\n", b.String())
wg.Done()
}()
//
//=====================
wg.Wait()
log.Println("[Main] Goodbye")
//os.Exit(0)
}