Ensure that only one just can run

Close #6

2 files changed, 16 insertions, 4 deletions

diff --git a/API.rst b/API.rst
index dd67cf1..9cec20b 100644
--- a/API.rst
+++ b/API.rst
@@ -19,11 +19,17 @@ Start a new remote session and register it in RWA
 
 **Return type:** string (JSON)
 
-**Structure of returned JSON:**
+**Structure of returned JSON (success):**
+
+::
+
+    {"status": "success", "id": <pid>, "url": "<url>", "pin": <pin>}
+
+**Structure of returned JSON (error):**
 
 ::
 
-    {"id": <pid>, "url": "<url>", "pin": <pin>}
+    {"status": "error"}
 
 
 status
diff --git a/service.py b/service.py
index 47ebfcb..9d5394f 100755
--- a/service.py
+++ b/service.py
@@ -13,7 +13,7 @@ from session import Session
 from trigger import TriggerServerThread
 
 ONE_TIME_SERVICE = False
-
+ALLOW_ONLY_ONE_SESSION = True
 
 class RWAService(dbus.service.Object):
     def __init__(self, loop, mockup_mode: bool = False):
@@ -33,6 +33,9 @@ class RWAService(dbus.service.Object):
     @dbus.service.method("org.ArcticaProject.RWA", out_signature="s")
     def start(self):
         """Start a new remote session."""
+        if ALLOW_ONLY_ONE_SESSION and len(self.sessions.values()) > 0:
+            return json.dumps({"status": "error"})
+
         # Start session
         session = Session(self.trigger_service.port, mockup_mode)
 
@@ -42,7 +45,10 @@ class RWAService(dbus.service.Object):
         # Start session update service
         self._ensure_update_service()
 
-        return json.dumps(session.client_meta)
+        return_json = session.client_meta
+        return_json["status"] = "success"
+
+        return json.dumps(return_json)
 
     @dbus.service.method("org.ArcticaProject.RWA", in_signature="i", out_signature="s")
     def status(self, pid: int) -> str: