Add heartbeat ping/pong to detect disconnects

Windows client sends ping every 10s.
Linux server responds with pong.
If write fails, client detects disconnect and reconnects.

1 files changed, 7 insertions, 0 deletions

diff --git a/cmd_linux.go b/cmd_linux.go
index 5d5e10a..4239d1d 100644
--- a/cmd_linux.go
+++ b/cmd_linux.go
@@ -155,6 +155,13 @@ func handleClient(conn net.Conn, stack *GitignoreStack) {
 					msg.Path, remoteManifest, *dryRun,
 				)
 			}
+
+		case "ping":
+			logDebug("ping from client")
+			pong := &ProtocolMessage{Type: "pong"}
+			pongData, _ := EncodeMessage(pong)
+			pongData = append(pongData, '\n')
+			conn.Write(pongData)
 		}
 	}