115 lines
2.9 KiB
Go
115 lines
2.9 KiB
Go
package main
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import (
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"github.com/gorilla/mux"
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"github.com/spf13/pflag"
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"github.com/spf13/viper"
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"net/http"
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"time"
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"os"
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"os/signal"
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"context"
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"sync"
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"log"
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)
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var CONFIG_FILE string
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var config ConfigStructure
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// Serve a directory to a port.
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func servePage(router *mux.Router, dest string, path string, port string) {
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router.PathPrefix(path).Handler(http.FileServer(http.Dir(dest)))
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srv := &http.Server{
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Addr: "0.0.0.0: " + port,
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// Good practice to set timeouts to avoid Slowloris attacks.
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WriteTimeout: time.Second * 15,
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ReadTimeout: time.Second * 15,
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IdleTimeout: time.Second * 60,
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Handler: router, // Pass our instance of gorilla/mux in.
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}
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// Run our server in a goroutine so that it doesn't block.
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go func() {
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if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
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log.Println(err)
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}
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}()
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log.Println("Web server is running on port " + string(port))
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}
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func parseConfig() {
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viper.SetConfigType("json")
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viper.SetConfigFile(CONFIG_FILE)
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viper.ReadInConfig()
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// TODO: Handle error
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viper.Unmarshal(&config)
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}
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func parseCLI() {
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// Define CLI option, shorthand, default value, and description
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// TODO: Dynamically obtain default config location from environment variables.
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pflag.StringP("config", "c", "/home/violet/.config/joshashton.dev/portfolio/live.json", "Configuration file used in initializing my portfolio.")
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pflag.Parse()
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viper.BindPFlags(pflag.CommandLine)
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// Retrieve CLI argument, either the default value or the user provided value.
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CONFIG_FILE = viper.GetString("config")
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}
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func serve() {
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var wg sync.WaitGroup
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r := mux.NewRouter()
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servePage(r, config.WebpageDir, "/", config.WebpagePort)
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addr := "0.0.0.0:" + config.RouterPort
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srv := &http.Server{
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Addr: addr,
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// Good practice to set timeouts to avoid Slowloris attacks.
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WriteTimeout: time.Second * 15,
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ReadTimeout: time.Second * 15,
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IdleTimeout: time.Second * 60,
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Handler: r, // Pass our instance of gorilla/mux in.
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}
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// Run our server in a goroutine so that it doesn't block.
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wg.Add(1)
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go func() {
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defer wg.Done()
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if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
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log.Println(err)
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}
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}()
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log.Println("Router is running on port ", config.RouterPort)
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c := make(chan os.Signal, 1)
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// We'll accept graceful shutdowns when quit via SIGINT (Ctrl+Shift+C)
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signal.Notify(c, os.Interrupt)
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// Block until we receive our signal.
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<-c
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// Create a deadline to wait for.
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ctx, cancel := context.WithTimeout(context.Background(), time.Duration(30))
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defer cancel()
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// Doesn't block if no connections, but will otherwise wait
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// until the timeout deadline.
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srv.Shutdown(ctx)
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// Optionally, you could run srv.Shutdown in a goroutine and block on
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// <-ctx.Done() if your application should wait for other services
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// to finalize based on context cancellation.
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log.Println("shutting down")
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wg.Wait()
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os.Exit(0)
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}
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func main() {
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parseCLI()
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parseConfig()
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serve()
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}
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