Rename rust folder to sgl-router (#2464)

Signed-off-by: Ata Fatahi <immrata@gmail.com>

sgl-router/py_src/sglang_router/launch_server.py

@@ -0,0 +1,180 @@
+import argparse
+import copy
+import logging
+import multiprocessing as mp
+import os
+import random
+import signal
+import sys
+import time
+from typing import List
+
+import requests
+from setproctitle import setproctitle
+from sglang_router.launch_router import RouterArgs, launch_router
+
+from sglang.srt.server import launch_server
+from sglang.srt.server_args import ServerArgs
+from sglang.srt.utils import is_port_available
+
+
+def setup_logger():
+    logger = logging.getLogger("router")
+    logger.setLevel(logging.INFO)
+
+    formatter = logging.Formatter(
+        "[Router (Python)] %(asctime)s - %(levelname)s - %(message)s",
+        datefmt="%Y-%m-%d %H:%M:%S",
+    )
+
+    handler = logging.StreamHandler()
+    handler.setFormatter(formatter)
+    logger.addHandler(handler)
+
+    return logger
+
+
+logger = setup_logger()
+
+
+# Create new process group
+def run_server(server_args, dp_rank):
+    """
+    Note:
+
+    1. Without os.setpgrp(), all processes share the same PGID. When you press Ctrl+C, the terminal sends SIGINT to all processes in the group simultaneously.
+    This can cause leaf processes to terminate first, which messes up the cleaning order and produces orphaned processes.
+
+    Terminal (PGID=100)
+    └── Main Python Process (PGID=100)
+        └── Server Process 1 (PGID=100)
+            └── Scheduler 1
+            └── Detokenizer 1
+        └── Server Process 2 (PGID=100)
+            └── Scheduler 2
+            └── Detokenizer 2
+
+    2. With os.setpgrp(), the main Python process and its children are in a separate group. Now:
+
+    Terminal (PGID=100)
+    └── Main Python Process (PGID=200)
+        └── Server Process 1 (PGID=300)
+            └── Scheduler 1
+            └── Detokenizer 1
+        └── Server Process 2 (PGID=400)
+            └── Scheduler 2
+            └── Detokenizer 2
+    """
+    # create new process group
+    os.setpgrp()
+
+    setproctitle(f"sglang::server")
+    # Set SGLANG_DP_RANK environment variable
+    os.environ["SGLANG_DP_RANK"] = str(dp_rank)
+
+    launch_server(server_args)
+
+
+def launch_server_process(
+    server_args: ServerArgs, worker_port: int, dp_id: int
+) -> mp.Process:
+    """Launch a single server process with the given args and port."""
+    server_args = copy.deepcopy(server_args)
+    server_args.port = worker_port
+    server_args.base_gpu_id = dp_id * server_args.tp_size
+    server_args.dp_size = 1
+
+    proc = mp.Process(target=run_server, args=(server_args, dp_id))
+    proc.start()
+    return proc
+
+
+def wait_for_server_health(host: str, port: int, timeout: int = 300) -> bool:
+    """Wait for server to be healthy by checking /health endpoint."""
+    start_time = time.time()
+    url = f"http://{host}:{port}/health"
+
+    while time.time() - start_time < timeout:
+        try:
+            response = requests.get(url, timeout=5)
+            if response.status_code == 200:
+                return True
+        except requests.exceptions.RequestException:
+            pass
+        time.sleep(1)
+    return False
+
+
+def find_available_ports(base_port: int, count: int) -> List[int]:
+    """Find consecutive available ports starting from base_port."""
+    available_ports = []
+    current_port = base_port
+
+    while len(available_ports) < count:
+        if is_port_available(current_port):
+            available_ports.append(current_port)
+        current_port += random.randint(100, 1000)
+
+    return available_ports
+
+
+def cleanup_processes(processes: List[mp.Process]):
+    for process in processes:
+        logger.info(f"Terminating process {process.pid}")
+        process.terminate()
+    logger.info("All processes terminated")
+
+
+def main():
+    # CUDA runtime isn't fork-safe, which can lead to subtle bugs or crashes
+    mp.set_start_method("spawn")
+
+    parser = argparse.ArgumentParser(
+        description="Launch SGLang router and server processes"
+    )
+
+    ServerArgs.add_cli_args(parser)
+    RouterArgs.add_cli_args(parser, use_router_prefix=True, exclude_host_port=True)
+    parser.add_argument(
+        "--router-dp-worker-base-port",
+        type=int,
+        default=31000,
+        help="Base port number for data parallel workers",
+    )
+
+    args = parser.parse_args()
+    server_args = ServerArgs.from_cli_args(args)
+    router_args = RouterArgs.from_cli_args(args, use_router_prefix=True)
+
+    # Find available ports for workers
+    worker_ports = find_available_ports(
+        args.router_dp_worker_base_port, server_args.dp_size
+    )
+
+    # Start server processes
+    server_processes = []
+
+    for i, worker_port in enumerate(worker_ports):
+        logger.info(f"Launching DP server process {i} on port {worker_port}")
+        proc = launch_server_process(server_args, worker_port, i)
+        server_processes.append(proc)
+
+    signal.signal(signal.SIGINT, lambda sig, frame: cleanup_processes(server_processes))
+    signal.signal(
+        signal.SIGTERM, lambda sig, frame: cleanup_processes(server_processes)
+    )
+    signal.signal(
+        signal.SIGQUIT, lambda sig, frame: cleanup_processes(server_processes)
+    )
+
+    # Update router args with worker URLs
+    router_args.worker_urls = [
+        f"http://{server_args.host}:{port}" for port in worker_ports
+    ]
+
+    # Start the router
+    router = launch_router(router_args)
+
+
+if __name__ == "__main__":
+    main()