PY-73432 Print effective debugger port number to stdout if single port mode enabled

GitOrigin-RevId: ff24636e02c90dc12f288b0ae2ff4700b4907fc7

python/helpers/pydev/_pydevd_bundle/pydevd_comm.py

@@ -71,9 +71,12 @@ from _pydev_imps._pydev_saved_modules import threading
 from _pydev_imps._pydev_saved_modules import time
 from _pydev_imps._pydev_saved_modules import socket
 from socket import socket, AF_INET, SOCK_STREAM, SHUT_RD, SHUT_WR, SOL_SOCKET, SO_REUSEADDR, SHUT_RDWR, timeout
-from _pydevd_bundle.pydevd_constants import DebugInfoHolder, get_thread_id, IS_JYTHON, IS_PY2, IS_PY3K, \
-    IS_PY36_OR_GREATER, STATE_RUN, dict_keys, ASYNC_EVAL_TIMEOUT_SEC, IS_IRONPYTHON, GlobalDebuggerHolder, \
-    get_global_debugger, GetGlobalDebugger, set_global_debugger, NEXT_VALUE_SEPARATOR
+from _pydevd_bundle.pydevd_constants import DebugInfoHolder, get_thread_id, IS_JYTHON, \
+    IS_PY2, IS_PY3K, \
+    IS_PY36_OR_GREATER, STATE_RUN, dict_keys, ASYNC_EVAL_TIMEOUT_SEC, IS_IRONPYTHON, \
+    GlobalDebuggerHolder, \
+    get_global_debugger, GetGlobalDebugger, set_global_debugger, NEXT_VALUE_SEPARATOR, \
+    SINGLE_PORT_MODE
 from _pydev_bundle.pydev_override import overrides
 import json
 import weakref
@@ -415,10 +418,15 @@ def start_server(port):
         s.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
 
     s.bind(('', port))
-    pydevd_log(1, "Bound to port ", str(port))
+    effective_port = s.getsockname()[1]
+    pydevd_log(1, "Bound to port ", str(effective_port))
 
     try:
         s.listen(1)
+        if SINGLE_PORT_MODE:
+            # Output the effective port number to stdout, allowing a client to read
+            # and connect to it.
+            sys.stdout.write("Waiting connection on port %s...\n" % effective_port)
         newSock, _addr = s.accept()
         pydevd_log(1, "Connection accepted")
         # closing server socket is not necessary but we don't need it
@@ -427,7 +435,7 @@ def start_server(port):
         return newSock
 
     except:
-        sys.stderr.write("Could not bind to port: %s\n" % (port,))
+        sys.stderr.write("Could not bind to port: %s\n" % (effective_port,))
         sys.stderr.flush()
         traceback.print_exc()
 

python/helpers/pydev/_pydevd_bundle/pydevd_constants.py

@@ -173,6 +173,8 @@ USE_LIB_COPY = SUPPORT_GEVENT and \
 USE_LOW_IMPACT_MONITORING = (IS_PY312_OR_GREATER and
                              os.environ.get('USE_LOW_IMPACT_MONITORING', False))
 
+SINGLE_PORT_MODE = os.environ.get("SINGLE_PORT_MODE")
+
 # The tool name to use in the API calls from PEP 669.
 PYDEVD_TOOL_NAME = 'pydevd'
 

python/src/com/jetbrains/python/debugger/PyDebugRunner.java

@@ -103,6 +103,7 @@ public class PyDebugRunner implements ProgramRunner<RunnerSettings> {
   protected static final @NonNls String PYCHARM_DEBUG = "PYCHARM_DEBUG";
   protected static final @NonNls String USE_LOW_IMPACT_MONITORING = "USE_LOW_IMPACT_MONITORING";
   protected static final @NonNls String HALT_VARIABLE_RESOLVE_THREADS_ON_STEP_RESUME = "HALT_VARIABLE_RESOLVE_THREADS_ON_STEP_RESUME";
+  protected static final @NonNls String SINGLE_PORT_MODE = "SINGLE_PORT_MODE";
 
   @SuppressWarnings("SpellCheckingInspection")
   private static final @NonNls String PYTHONPATH_ENV_NAME = "PYTHONPATH";
@@ -704,6 +705,10 @@ public class PyDebugRunner implements ProgramRunner<RunnerSettings> {
     if (registryManager.is("python.debug.halt.variable.resolve.threads.on.step.resume")) {
       environmentController.putFixedValue(HALT_VARIABLE_RESOLVE_THREADS_ON_STEP_RESUME, "True");
     }
+
+    if (registryManager.is("python.debug.use.single.port")) {
+      environmentController.putFixedValue(SINGLE_PORT_MODE, "True");
+    }
   }
 
   /**