From 15f35dc1c2eb50a8140f1a0abf45d5aa25fdf66b Mon Sep 17 00:00:00 2001
From: Timotej Lazar <timotej.lazar@araneo.org>
Date: Tue, 22 Sep 2015 11:33:43 +0200
Subject: Add support for execing the user's Python program

---
 server/handlers.py       | 24 +++++++++++++++++++++++-
 server/python_session.py | 15 ++++++++++++++-
 2 files changed, 37 insertions(+), 2 deletions(-)

(limited to 'server')

diff --git a/server/handlers.py b/server/handlers.py
index 52a33f5..08994a0 100644
--- a/server/handlers.py
+++ b/server/handlers.py
@@ -106,7 +106,27 @@ class Query(CodeqService):
                 request.reply(result)
 
 
-# Push stdin to the session's Python interpreter. TODO: convert to async handling
+# Push user program to the Python interpreter to be exec'd.
+class PythonExec(CodeqService):
+    def process(self, request):
+        program = request.data.get('program')
+        if program is None:
+            request.reply({'code': 1, 'message': 'No program specified'})
+        else:
+            python = request.session.get_python()
+            python.exec(program)
+            request.reply({'code': 0, 'message': 'ok'})
+
+
+# Send an interrupt to the Python interpreter.
+class PythonStop(CodeqService):
+    def process(self, request):
+        python = request.session.get_python()
+        python.stop()
+        request.reply({'code': 0, 'message': 'ok'})
+
+
+# Push stdin to the Python interpreter.
 class PythonPush(CodeqService):
     def process(self, request):
         text = request.data.get('text')
@@ -194,7 +214,9 @@ incoming_handlers = {
     'logout': None,
     'activity': Activity(),
     'query': Query(),
+    'python_exec': PythonExec(),
     'python_push': PythonPush(),
+    'python_stop': PythonStop(),
     'hint': Hint(),
     'test': Test()
 }
diff --git a/server/python_session.py b/server/python_session.py
index 62fcbf8..6f2c999 100644
--- a/server/python_session.py
+++ b/server/python_session.py
@@ -6,6 +6,7 @@ import io
 import multiprocessing
 import os
 import queue
+import signal
 import subprocess
 import sys
 import threading
@@ -55,9 +56,15 @@ class PythonSession(object):
             p.terminate()
         return results
 
+    def exec(self, program):
+        self._control.put_nowait(('exec', program))
+
     def push(self, stdin):
         self._control.put_nowait(('push', stdin))
 
+    def stop(self):
+        self._control.put_nowait(('stop', None))
+
     def destroy(self):
         self._control.put_nowait(('done', None))
 
@@ -125,9 +132,15 @@ def _interpreter(control, callback):
         # Get a control command.
         try:
             cmd, data = control.get_nowait()
-            if cmd == 'push':
+            if cmd == 'exec':
+                exec_str = 'exec("""\\\n{}\n""")\n'.format(data.replace('"', '\\"'))
+                proc.stdin.write(exec_str.encode('utf-8'))
+                proc.stdin.flush()
+            elif cmd == 'push':
                 proc.stdin.write(data.encode('utf-8'))
                 proc.stdin.flush()
+            elif cmd == 'stop':
+                proc.send_signal(signal.SIGINT)
             elif cmd == 'done':
                 break
         except:
-- 
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