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/*
Copyright (c) 2019 Ben Morrison (gbmor)
This file is part of Getwtxt.
Getwtxt 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.
Getwtxt 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 Getwtxt. If not, see <https://www.gnu.org/licenses/>.
*/
package svc // import "github.com/getwtxt/getwtxt/svc"
import (
"html/template"
"log"
"os"
"os/signal"
"time"
"github.com/getwtxt/registry"
"github.com/spf13/pflag"
)
var (
// Vers contains the version number set at build time
Vers string
flagVersion *bool = pflag.BoolP("version", "v", false, "Display version information, then exit.")
flagHelp *bool = pflag.BoolP("help", "h", false, "Display the quick-help screen.")
flagMan *bool = pflag.BoolP("manual", "m", false, "Display the configuration manual.")
flagConfFile *string = pflag.StringP("config", "c", "", "The name/path of the configuration file you wish to use.")
flagAssets *string = pflag.StringP("assets", "a", "", "The location of the getwtxt assets directory.")
flagDBPath *string = pflag.StringP("db", "d", "", "Path to the getwtxt database.")
flagDBType *string = pflag.StringP("dbtype", "t", "", "Type of database being used.")
)
// Holds the global configuration
var confObj = &Configuration{}
// Signals to close the log file
var closeLog = make(chan struct{}, 1)
// Used to transmit database pointer
var dbChan = make(chan dbase, 1)
// Used to transmit the wrapped tickers
// corresponding to the in-memory cache
// or the on-disk database.
var dbTickC = make(chan *tick, 1)
var cTickC = make(chan *tick, 1)
// Used to manage the landing page template
var tmpls *template.Template
// Holds the registry data in-memory
var twtxtCache = registry.New(nil)
// List of other registries submitted to this registry
var remoteRegistries = &RemoteRegistries{
List: make([]string, 0),
}
// In-memory cache of static assets, specifically
// the parsed landing page and the stylesheet.
var staticCache = &staticAssets{}
// Logs an error that should cause a catastrophic
// failure of getwtxt
func errFatal(context string, err error) {
if err != nil {
log.Fatalf(context+"%v\n", err.Error())
}
}
// Logs non-fatal errors.
func errLog(context string, err error) {
if err != nil {
log.Printf(context+"%v\n", err.Error())
}
}
// I'm not using init() because it runs
// even during testing and was causing
// problems.
func initSvc() {
checkFlags()
titleScreen()
initConfig()
initLogging()
initDatabase()
tmpls = initTemplates()
initPersistence()
pingAssets()
watchForInterrupt()
}
// Responds to some command-line flags
func checkFlags() {
pflag.Parse()
if *flagVersion {
titleScreen()
os.Exit(0)
}
if *flagHelp {
titleScreen()
helpScreen()
os.Exit(0)
}
if *flagMan {
titleScreen()
helpScreen()
manualScreen()
os.Exit(0)
}
}
// Watch for SIGINT aka ^C
// Close the log file then exit
func watchForInterrupt() {
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
for sigint := range c {
log.Printf("Caught %v\n", sigint)
log.Printf("Pushing to database ...\n")
pushDB()
log.Printf("Cleaning up ...\n")
killTickers()
killDB()
confObj.Mu.RLock()
log.Printf("Closed database connection to %v\n", confObj.DBPath)
if !confObj.StdoutLogging {
closeLog <- struct{}{}
}
confObj.Mu.RUnlock()
close(dbChan)
close(closeLog)
// Let everything catch up
time.Sleep(100 * time.Millisecond)
os.Exit(0)
}
}()
}
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