feat(tunasync): add `tunasynctl reload` subcommand

cmd/tunasynctl/tunasynctl.go

@@ -225,6 +225,39 @@ func cmdJob(cmd tunasync.CmdVerb) cli.ActionFunc {
 	}
 }
 
+func cmdWorker(cmd tunasync.CmdVerb) cli.ActionFunc {
+	return func(c *cli.Context) error {
+		cmd := tunasync.ClientCmd{
+			Cmd:      cmd,
+			WorkerID: c.String("worker"),
+		}
+		resp, err := tunasync.PostJSON(baseURL+cmdPath, cmd, client)
+		if err != nil {
+			return cli.NewExitError(
+				fmt.Sprintf("Failed to correctly send command: %s",
+					err.Error()),
+				1)
+		}
+		defer resp.Body.Close()
+
+		if resp.StatusCode != http.StatusOK {
+			body, err := ioutil.ReadAll(resp.Body)
+			if err != nil {
+				return cli.NewExitError(
+					fmt.Sprintf("Failed to parse response: %s", err.Error()),
+					1)
+			}
+
+			return cli.NewExitError(fmt.Sprintf("Failed to correctly send"+
+				" command: HTTP status code is not 200: %s", body),
+				1)
+		}
+		logger.Info("Succesfully send command")
+
+		return nil
+	}
+}
+
 func main() {
 	app := cli.NewApp()
 	app.EnableBashCompletion = true
@@ -304,6 +337,12 @@ func main() {
 			Flags:  append(commonFlags, cmdFlags...),
 			Action: initializeWrapper(cmdJob(tunasync.CmdRestart)),
 		},
+		{
+			Name:   "reload",
+			Usage:  "Tell worker to reload configurations",
+			Flags:  append(commonFlags, cmdFlags...),
+			Action: initializeWrapper(cmdWorker(tunasync.CmdReload)),
+		},
 		{
 			Name:   "ping",
 			Flags:  append(commonFlags, cmdFlags...),

internal/msg.go

@@ -35,6 +35,7 @@ const (
 	CmdDisable         // disable the job (stops goroutine)
 	CmdRestart         // restart syncing
 	CmdPing            // ensure the goroutine is alive
+	CmdReload          // reload mirror config
 )
 
 func (c CmdVerb) String() string {
@@ -49,6 +50,8 @@ func (c CmdVerb) String() string {
 		return "restart"
 	case CmdPing:
 		return "ping"
+	case CmdReload:
+		return "reload"
 	}
 	return "unknown"
 }

worker/worker.go

@@ -3,7 +3,9 @@ package worker
 import (
 	"fmt"
 	"net/http"
+	"os"
 	"sync"
+	"syscall"
 	"time"
 
 	"github.com/gin-gonic/gin"
@@ -185,16 +187,32 @@ func (w *Worker) makeHTTPServer() {
 			return
 		}
 
+		logger.Noticef("Received command: %v", cmd)
+
+		if cmd.MirrorID == "" {
+			// worker-level commands
+			switch cmd.Cmd {
+			case CmdReload:
+				// send myself a SIGHUP
+				pid := os.Getpid()
+				syscall.Kill(pid, syscall.SIGHUP)
+			default:
+				c.JSON(http.StatusNotAcceptable, gin.H{"msg": "Invalid Command"})
+				return
+			}
+		}
+
+		// job level comands
 		job, ok := w.jobs[cmd.MirrorID]
 		if !ok {
 			c.JSON(http.StatusNotFound, gin.H{"msg": fmt.Sprintf("Mirror ``%s'' not found", cmd.MirrorID)})
 			return
 		}
 
-		logger.Noticef("Received command: %v", cmd)
 		// No matter what command, the existing job
 		// schedule should be flushed
 		w.schedule.Remove(job.Name())
+
 		// if job disabled, start them first
 		switch cmd.Cmd {
 		case CmdStart, CmdRestart: