Docs: Implemented frontend docs (#3791)

Co-authored-by: Chayenne <zhaochen20@outlook.com>

docs/frontend/patch.py

@@ -0,0 +1,50 @@
+import os
+import weakref
+
+from sglang.utils import execute_shell_command, reserve_port
+
+DEFAULT_MAX_RUNNING_REQUESTS = 200
+DEFAULT_MAX_TOTAL_TOKENS = 20480
+
+import sglang.srt.server_args as server_args_mod
+
+_original_post_init = server_args_mod.ServerArgs.__post_init__
+
+
+def patched_post_init(self):
+    _original_post_init(self)
+    if self.max_running_requests is None:
+        self.max_running_requests = DEFAULT_MAX_RUNNING_REQUESTS
+    if self.max_total_tokens is None:
+        self.max_total_tokens = DEFAULT_MAX_TOTAL_TOKENS
+    self.disable_cuda_graph = True
+
+
+server_args_mod.ServerArgs.__post_init__ = patched_post_init
+
+process_socket_map = weakref.WeakKeyDictionary()
+
+
+def launch_server_cmd(command: str, host: str = "0.0.0.0", port: int = None):
+    """
+    Launch the server using the given command.
+    If no port is specified, a free port is reserved.
+    """
+    if port is None:
+        port, lock_socket = reserve_port(host)
+    else:
+        lock_socket = None
+
+    extra_flags = (
+        f"--max-running-requests {DEFAULT_MAX_RUNNING_REQUESTS} "
+        f"--max-total-tokens {DEFAULT_MAX_TOTAL_TOKENS} "
+        f"--disable-cuda-graph"
+    )
+
+    full_command = f"{command} --port {port} {extra_flags}"
+    process = execute_shell_command(full_command)
+
+    if lock_socket is not None:
+        process_socket_map[process] = lock_socket
+
+    return process, port