Add serve action

cmd/server/server.go

@@ -1,7 +1,83 @@
 package main
 
-import "fmt"
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"os"
+	"os/signal"
+	"time"
+
+	"git.t-juice.club/torjus/gpaste"
+	"github.com/urfave/cli/v2"
+)
+
+var (
+	version = "dev"
+	commit  = "none"
+	date    = "unknown"
+)
 
 func main() {
-	fmt.Println("Starting gpaste server")
+	cli.VersionFlag = &cli.BoolFlag{Name: "version"}
+
+	app := cli.App{
+		Name:    "gpaste-server",
+		Version: fmt.Sprintf("gpaste-server %s-%s (%s)", version, commit, date),
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Name:  "config",
+				Usage: "Path to config-file.",
+			},
+		},
+		Action: ActionServe,
+	}
+
+	app.Run(os.Args)
+}
+
+func ActionServe(c *cli.Context) error {
+	configPath := "gpaste-server.toml"
+	if c.IsSet("config") {
+		configPath = c.String("config")
+	}
+
+	f, err := os.Open(configPath)
+	if err != nil {
+		return cli.Exit(err, 1)
+	}
+	defer f.Close()
+	cfg, err := gpaste.ServerConfigFromReader(f)
+	if err != nil {
+		return cli.Exit(err, 1)
+	}
+
+	rootCtx, rootCancel := signal.NotifyContext(context.Background(), os.Interrupt)
+	defer rootCancel()
+
+	httpCtx, httpCancel := context.WithCancel(rootCtx)
+	defer httpCancel()
+
+	httpShutdownCtx, httpShutdownCancel := context.WithCancel(context.Background())
+	defer httpShutdownCancel()
+
+	go func() {
+		srv := gpaste.NewHTTPServer(cfg)
+		srv.Addr = cfg.ListenAddr
+
+		// Wait for cancel
+		go func() {
+			<-httpCtx.Done()
+			timeoutCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+			defer cancel()
+			srv.Shutdown(timeoutCtx)
+		}()
+		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			fmt.Printf("Error: %s\n", err)
+		}
+		httpShutdownCancel()
+	}()
+	<-httpShutdownCtx.Done()
+
+	return nil
 }