Make host:port for tracer configurable

src/starkware/cairo/lang/tracer/tracer.py

@@ -26,6 +26,7 @@ def trace_runner(runner):
     trace = runner.relocated_trace
 
     run_tracer(
+        "localhost", 8100,
         TracerData(
             program=runner.program,
             memory=memory,
@@ -41,7 +42,7 @@ def server_bind(self):
         self.socket.bind(self.server_address)
 
 
-def run_tracer(tracer_data: TracerData):
+def run_tracer(host: str, port: int, tracer_data: TracerData):
     # Change directory for the SimpleHTTPRequestHandler.
     os.chdir(os.path.abspath(os.path.dirname(__file__)))
 
@@ -92,18 +93,17 @@ def write_json(self, json_obj):
                 # Request was canceled.
                 pass
 
-    def start_server():
-        port = 8100
+    def start_server(host: str, port: int):
         while True:
             try:
-                return SimpleTCPServer(("localhost", port), Handler)
+                return SimpleTCPServer((host, port), Handler)
             except OSError:
                 pass
             # port was not available. Try the next one.
             port += 1
 
-    httpd = start_server()
-    print("Running tracer on http://localhost:%d/" % httpd.server_address[1])
+    httpd = start_server(host, port)
+    print(f"Running tracer on http://{httpd.server_address[0]}:{httpd.server_address[1]}/")
     print()
     httpd.serve_forever()
 
@@ -117,6 +117,8 @@ def main():
     )
     parser.add_argument("--memory", type=str, required=True, help="A path to the memory file.")
     parser.add_argument("--trace", type=str, required=True, help="A path to the trace file.")
+    parser.add_argument("--host", default="localhost", type=str, help="Host to serve on.")
+    parser.add_argument("--port", default="8100", type=int, help="Port to serve on.")
     parser.add_argument("--air_public_input", type=str, help="A path to the AIR public input file.")
     parser.add_argument("--debug_info", type=str, help="A path to the run time debug info file.")
 
@@ -130,7 +132,7 @@ def main():
         debug_info_path=args.debug_info,
     )
 
-    run_tracer(tracer_data)
+    run_tracer(args.host, args.port, tracer_data)
     return 0
 
 

src/starkware/cairo/lang/vm/cairo_run.py

@@ -148,7 +148,11 @@ def main():
         default="plain",
         help="The layout of the Cairo AIR.",
     )
-    parser.add_argument("--tracer", action="store_true", help="Run the tracer.")
+    parser.add_argument(
+            "--tracer", 
+            nargs='?',
+            const="localhost:8100",
+            help="Run the tracer at the given host and port (default: localhost:8100.")
     parser.add_argument(
         "--profile_output",
         type=str,
@@ -432,7 +436,12 @@ def cairo_run(args):
             debug_info_file=debug_info_file, debug_info=runner.get_relocated_debug_info()
         )
 
-    if args.tracer:
+    if args.tracer is not None:
+        # Tracer set, split host and port. 
+        splits = args.tracer.split(':')
+        host = splits[0]
+        port = int(splits[1])
+
         CAIRO_TRACER = "starkware.cairo.lang.tracer.tracer"
         subprocess.call(
             list(
@@ -444,6 +453,8 @@ def cairo_run(args):
                         CAIRO_TRACER,
                         f"--program={args.program.name}",
                         f"--trace={trace_file.name}",
+                        f"--host={host}",
+                        f"--port={port}",
                         f"--memory={memory_file.name}",
                         f"--air_public_input={args.air_public_input.name}"
                         if args.air_public_input