2 files changed, 96 insertions, 0 deletions

diff --git a/cmd/platform/server.go b/cmd/platform/server.go
index 80b38401e..31606e6eb 100644
--- a/cmd/platform/server.go
+++ b/cmd/platform/server.go
@@ -4,6 +4,7 @@
 package main
 
 import (
+	"net"
 	"os"
 	"os/signal"
 	"syscall"
@@ -174,6 +175,8 @@ func runServer(configFileLocation string, disableConfigWatch bool, interruptChan
 		a.Jobs.StartSchedulers()
 	}
 
+	notifyReady()
+
 	// wait for kill signal before attempting to gracefully shutdown
 	// the running service
 	signal.Notify(interruptChan, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
@@ -244,6 +247,35 @@ func doDiagnostics(a *app.App) {
 	}
 }
 
+func notifyReady() {
+	// If the environment vars provide a systemd notification socket,
+	// notify systemd that the server is ready.
+	systemdSocket := os.Getenv("NOTIFY_SOCKET")
+	if systemdSocket != "" {
+		l4g.Info("Sending systemd READY notification.")
+
+		err := sendSystemdReadyNotification(systemdSocket)
+		if err != nil {
+			l4g.Error(err.Error())
+		}
+	}
+}
+
+func sendSystemdReadyNotification(socketPath string) error {
+	msg := "READY=1"
+	addr := &net.UnixAddr{
+		Name: socketPath,
+		Net:  "unixgram",
+	}
+	conn, err := net.DialUnix(addr.Net, nil, addr)
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+	_, err = conn.Write([]byte(msg))
+	return err
+}
+
 func doTokenCleanup(a *app.App) {
 	a.Srv.Store.Token().Cleanup()
 }
diff --git a/cmd/platform/server_test.go b/cmd/platform/server_test.go
index 15f9a357a..2f04e7d15 100644
--- a/cmd/platform/server_test.go
+++ b/cmd/platform/server_test.go
@@ -5,6 +5,7 @@ package main
 
 import (
 	"io/ioutil"
+	"net"
 	"os"
 	"syscall"
 	"testing"
@@ -70,3 +71,66 @@ func TestRunServerInvalidConfigFile(t *testing.T) {
 	err = runServer(unreadableConfigFile.Name(), th.disableConfigWatch, th.interruptChan)
 	require.Error(t, err)
 }
+
+func TestRunServerSystemdNotification(t *testing.T) {
+	th := SetupServerTest()
+	defer th.TearDownServerTest()
+
+	// Get a random temporary filename for using as a mock systemd socket
+	socketFile, err := ioutil.TempFile("", "mattermost-systemd-mock-socket-")
+	if err != nil {
+		panic(err)
+	}
+	socketPath := socketFile.Name()
+	os.Remove(socketPath)
+
+	// Set the socket path in the process environment
+	originalSocket := os.Getenv("NOTIFY_SOCKET")
+	os.Setenv("NOTIFY_SOCKET", socketPath)
+	defer os.Setenv("NOTIFY_SOCKET", originalSocket)
+
+	// Open the socket connection
+	addr := &net.UnixAddr{
+		Name: socketPath,
+		Net:  "unixgram",
+	}
+	connection, err := net.ListenUnixgram("unixgram", addr)
+	if err != nil {
+		panic(err)
+	}
+	defer connection.Close()
+	defer os.Remove(socketPath)
+
+	// Listen for socket data
+	socketReader := make(chan string)
+	go func(ch chan string) {
+		buffer := make([]byte, 512)
+		count, err := connection.Read(buffer)
+		if err != nil {
+			panic(err)
+		}
+		data := buffer[0:count]
+		ch<- string(data)
+	}(socketReader)
+
+	// Start and stop the server
+	err = runServer(th.configPath, th.disableConfigWatch, th.interruptChan)
+	require.NoError(t, err)
+
+	// Ensure the notification has been sent on the socket and is correct
+	notification := <-socketReader
+	require.Equal(t, notification, "READY=1")
+}
+
+func TestRunServerNoSystemd(t *testing.T) {
+	th := SetupServerTest()
+	defer th.TearDownServerTest()
+
+	// Temporarily remove any Systemd socket defined in the environment
+	originalSocket := os.Getenv("NOTIFY_SOCKET")
+	os.Unsetenv("NOTIFY_SOCKET")
+	defer os.Setenv("NOTIFY_SOCKET", originalSocket)
+
+	err := runServer(th.configPath, th.disableConfigWatch, th.interruptChan)
+	require.NoError(t, err)
+}