269 lines
9.2 KiB
Python
269 lines
9.2 KiB
Python
import argparse
|
|
import dataclasses
|
|
import logging
|
|
import sys
|
|
from typing import List, Optional
|
|
|
|
from sglang_router import Router
|
|
from sglang_router_rs import PolicyType
|
|
|
|
|
|
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
|
|
|
|
|
|
@dataclasses.dataclass
|
|
class RouterArgs:
|
|
# Worker configuration
|
|
worker_urls: List[str] = dataclasses.field(default_factory=list)
|
|
host: str = "127.0.0.1"
|
|
port: int = 30000
|
|
|
|
# Routing policy
|
|
policy: str = "cache_aware"
|
|
worker_startup_timeout_secs: int = 300
|
|
worker_startup_check_interval: int = 10
|
|
cache_threshold: float = 0.5
|
|
balance_abs_threshold: int = 32
|
|
balance_rel_threshold: float = 1.0001
|
|
eviction_interval: int = 60
|
|
max_tree_size: int = 2**24
|
|
max_payload_size: int = 4 * 1024 * 1024 # 4MB
|
|
verbose: bool = False
|
|
|
|
@staticmethod
|
|
def add_cli_args(
|
|
parser: argparse.ArgumentParser,
|
|
use_router_prefix: bool = False,
|
|
exclude_host_port: bool = False,
|
|
):
|
|
"""
|
|
Add router-specific arguments to an argument parser.
|
|
|
|
Args:
|
|
parser: The argument parser to add arguments to
|
|
use_router_prefix: If True, prefix all arguments with 'router-' to avoid conflicts
|
|
exclude_host_port: If True, don't add host and port arguments (used when inheriting from server)
|
|
"""
|
|
prefix = "router-" if use_router_prefix else ""
|
|
|
|
# Worker configuration
|
|
if not exclude_host_port:
|
|
parser.add_argument(
|
|
"--host",
|
|
type=str,
|
|
default=RouterArgs.host,
|
|
help="Host address to bind the router server",
|
|
)
|
|
parser.add_argument(
|
|
"--port",
|
|
type=int,
|
|
default=RouterArgs.port,
|
|
help="Port number to bind the router server",
|
|
)
|
|
|
|
parser.add_argument(
|
|
"--worker-urls",
|
|
type=str,
|
|
nargs="+",
|
|
help="List of worker URLs (e.g., http://worker1:8000 http://worker2:8000)",
|
|
)
|
|
|
|
# Routing policy configuration
|
|
parser.add_argument(
|
|
f"--{prefix}policy",
|
|
type=str,
|
|
default=RouterArgs.policy,
|
|
choices=["random", "round_robin", "cache_aware"],
|
|
help="Load balancing policy to use",
|
|
)
|
|
parser.add_argument(
|
|
f"--{prefix}worker-startup-timeout-secs",
|
|
type=int,
|
|
default=RouterArgs.worker_startup_timeout_secs,
|
|
help="Timeout in seconds for worker startup",
|
|
)
|
|
parser.add_argument(
|
|
f"--{prefix}worker-startup-check-interval",
|
|
type=int,
|
|
default=RouterArgs.worker_startup_check_interval,
|
|
help="Interval in seconds between checks for worker startup",
|
|
)
|
|
parser.add_argument(
|
|
f"--{prefix}cache-threshold",
|
|
type=float,
|
|
default=RouterArgs.cache_threshold,
|
|
help="Cache threshold (0.0-1.0) for cache-aware routing",
|
|
)
|
|
parser.add_argument(
|
|
f"--{prefix}balance-abs-threshold",
|
|
type=int,
|
|
default=RouterArgs.balance_abs_threshold,
|
|
help="Load balancing is triggered when (max_load - min_load) > abs_threshold AND max_load > min_load * rel_threshold. Otherwise, use cache aware",
|
|
)
|
|
parser.add_argument(
|
|
f"--{prefix}balance-rel-threshold",
|
|
type=float,
|
|
default=RouterArgs.balance_rel_threshold,
|
|
help="Load balancing is triggered when (max_load - min_load) > abs_threshold AND max_load > min_load * rel_threshold. Otherwise, use cache aware",
|
|
)
|
|
parser.add_argument(
|
|
f"--{prefix}eviction-interval",
|
|
type=int,
|
|
default=RouterArgs.eviction_interval,
|
|
help="Interval in seconds between cache eviction operations",
|
|
)
|
|
parser.add_argument(
|
|
f"--{prefix}max-tree-size",
|
|
type=int,
|
|
default=RouterArgs.max_tree_size,
|
|
help="Maximum size of the approximation tree for cache-aware routing",
|
|
)
|
|
parser.add_argument(
|
|
f"--{prefix}max-payload-size",
|
|
type=int,
|
|
default=RouterArgs.max_payload_size,
|
|
help="Maximum payload size in bytes",
|
|
)
|
|
parser.add_argument(
|
|
f"--{prefix}verbose",
|
|
action="store_true",
|
|
help="Enable verbose logging",
|
|
)
|
|
|
|
@classmethod
|
|
def from_cli_args(
|
|
cls, args: argparse.Namespace, use_router_prefix: bool = False
|
|
) -> "RouterArgs":
|
|
"""
|
|
Create RouterArgs instance from parsed command line arguments.
|
|
|
|
Args:
|
|
args: Parsed command line arguments
|
|
use_router_prefix: If True, look for arguments with 'router-' prefix
|
|
"""
|
|
prefix = "router_" if use_router_prefix else ""
|
|
worker_urls = args.worker_urls if args.worker_urls is not None else []
|
|
return cls(
|
|
worker_urls=worker_urls,
|
|
host=args.host,
|
|
port=args.port,
|
|
policy=getattr(args, f"{prefix}policy"),
|
|
worker_startup_timeout_secs=getattr(
|
|
args, f"{prefix}worker_startup_timeout_secs"
|
|
),
|
|
worker_startup_check_interval=getattr(
|
|
args, f"{prefix}worker_startup_check_interval"
|
|
),
|
|
cache_threshold=getattr(args, f"{prefix}cache_threshold"),
|
|
balance_abs_threshold=getattr(args, f"{prefix}balance_abs_threshold"),
|
|
balance_rel_threshold=getattr(args, f"{prefix}balance_rel_threshold"),
|
|
eviction_interval=getattr(args, f"{prefix}eviction_interval"),
|
|
max_tree_size=getattr(args, f"{prefix}max_tree_size"),
|
|
max_payload_size=getattr(args, f"{prefix}max_payload_size"),
|
|
verbose=getattr(args, f"{prefix}verbose", False),
|
|
)
|
|
|
|
|
|
def policy_from_str(policy_str: str) -> PolicyType:
|
|
"""Convert policy string to PolicyType enum."""
|
|
policy_map = {
|
|
"random": PolicyType.Random,
|
|
"round_robin": PolicyType.RoundRobin,
|
|
"cache_aware": PolicyType.CacheAware,
|
|
}
|
|
return policy_map[policy_str]
|
|
|
|
|
|
def launch_router(args: argparse.Namespace) -> Optional[Router]:
|
|
"""
|
|
Launch the SGLang router with the configuration from parsed arguments.
|
|
|
|
Args:
|
|
args: Namespace object containing router configuration
|
|
Can be either raw argparse.Namespace or converted RouterArgs
|
|
|
|
Returns:
|
|
Router instance if successful, None if failed
|
|
"""
|
|
logger = logging.getLogger("router")
|
|
try:
|
|
# Convert to RouterArgs if needed
|
|
if not isinstance(args, RouterArgs):
|
|
router_args = RouterArgs.from_cli_args(args)
|
|
else:
|
|
router_args = args
|
|
|
|
router = Router(
|
|
worker_urls=router_args.worker_urls,
|
|
host=router_args.host,
|
|
port=router_args.port,
|
|
policy=policy_from_str(router_args.policy),
|
|
worker_startup_timeout_secs=router_args.worker_startup_timeout_secs,
|
|
worker_startup_check_interval=router_args.worker_startup_check_interval,
|
|
cache_threshold=router_args.cache_threshold,
|
|
balance_abs_threshold=router_args.balance_abs_threshold,
|
|
balance_rel_threshold=router_args.balance_rel_threshold,
|
|
eviction_interval_secs=router_args.eviction_interval,
|
|
max_tree_size=router_args.max_tree_size,
|
|
max_payload_size=router_args.max_payload_size,
|
|
verbose=router_args.verbose,
|
|
)
|
|
|
|
router.start()
|
|
return router
|
|
|
|
except Exception as e:
|
|
logger.error(f"Error starting router: {e}")
|
|
raise e
|
|
|
|
|
|
class CustomHelpFormatter(
|
|
argparse.RawDescriptionHelpFormatter, argparse.ArgumentDefaultsHelpFormatter
|
|
):
|
|
"""Custom formatter that preserves both description formatting and shows defaults"""
|
|
|
|
pass
|
|
|
|
|
|
def parse_router_args(args: List[str]) -> RouterArgs:
|
|
"""Parse command line arguments and return RouterArgs instance."""
|
|
parser = argparse.ArgumentParser(
|
|
description="""SGLang Router - High-performance request distribution across worker nodes
|
|
|
|
Usage:
|
|
This launcher enables starting a router with individual worker instances. It is useful for
|
|
multi-node setups or when you want to start workers and router separately.
|
|
|
|
Examples:
|
|
python -m sglang_router.launch_router --worker-urls http://worker1:8000 http://worker2:8000
|
|
python -m sglang_router.launch_router --worker-urls http://worker1:8000 http://worker2:8000 --cache-threshold 0.7 --balance-abs-threshold 64 --balance-rel-threshold 1.2
|
|
|
|
""",
|
|
formatter_class=CustomHelpFormatter,
|
|
)
|
|
|
|
RouterArgs.add_cli_args(parser, use_router_prefix=False)
|
|
return RouterArgs.from_cli_args(parser.parse_args(args), use_router_prefix=False)
|
|
|
|
|
|
def main() -> None:
|
|
router_args = parse_router_args(sys.argv[1:])
|
|
launch_router(router_args)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|