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[PD] Add simple unit test for disaggregation feature (#5654)  
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import subprocess
import time
import unittest
from types import SimpleNamespace

import requests

from sglang.srt.utils import kill_process_tree
from sglang.test.few_shot_gsm8k import run_eval as run_eval_few_shot_gsm8k
from sglang.test.test_utils import (
    DEFAULT_MODEL_NAME_FOR_TEST,
    DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
    DEFAULT_URL_FOR_TEST,
    CustomTestCase,
    popen_launch_pd_server,
    run_with_timeout,
)


class TestDisaggregationMooncake(CustomTestCase):
    @classmethod
    def setUpClass(cls):
        cls.model = DEFAULT_MODEL_NAME_FOR_TEST
        cls.base_host = "127.0.0.1"
        cls.base_port = int(DEFAULT_URL_FOR_TEST.split(":")[-1])
        cls.lb_url = DEFAULT_URL_FOR_TEST
        cls.prefill_url = f"http://{cls.base_host}:{cls.base_port + 100}"
        cls.decode_url = f"http://{cls.base_host}:{cls.base_port + 200}"

        run_with_timeout(cls.start_prefill, timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH)
        run_with_timeout(cls.start_decode, timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH)

        cls.wait_server_ready(cls.prefill_url + "/health")
        cls.wait_server_ready(cls.decode_url + "/health")

        lb_command = [
            "python3",
            "-m",
            "sglang.srt.disaggregation.mini_lb",
            "--prefill",
            cls.prefill_url,
            "--decode",
            cls.decode_url,
            "--host",
            cls.base_host,
            "--port",
            str(cls.base_port),
        ]

        print("Starting load balancer:", " ".join(lb_command))
        cls.process_lb = subprocess.Popen(
            lb_command, stdout=subprocess.PIPE, stderr=subprocess.PIPE
        )
        cls.wait_server_ready(cls.lb_url + "/health")

    @classmethod
    def start_prefill(cls):
        prefill_args = [
            "--trust-remote-code",
            "--disaggregation-mode",
            "prefill",
            "--host",
            cls.base_host,
            "--port",
            str(cls.base_port + 100),
            "--tp",
            "4",
        ]
        cls.process_prefill = popen_launch_pd_server(
            cls.model,
            cls.prefill_url,
            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
            other_args=prefill_args,
        )

    @classmethod
    def start_decode(cls):
        decode_args = [
            "--trust-remote-code",
            "--disaggregation-mode",
            "decode",
            "--host",
            cls.base_host,
            "--port",
            str(cls.base_port + 200),
            "--tp",
            "4",
            "--base-gpu-id",
            "4",
        ]
        cls.process_decode = popen_launch_pd_server(
            cls.model,
            cls.decode_url,
            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
            other_args=decode_args,
        )

    @classmethod
    def wait_server_ready(cls, url, timeout=60):
        start_time = time.time()
        while True:
            try:
                response = requests.get(url)
                if response.status_code == 200:
                    print(f"Server {url} is ready")
                    return
            except Exception:
                pass

            if time.time() - start_time > timeout:
                raise RuntimeError(f"Server {url} failed to start in {timeout}s")
            time.sleep(1)

    @classmethod
    def tearDownClass(cls):
        for process in [cls.process_lb, cls.process_decode, cls.process_prefill]:
            if process:
                try:
                    kill_process_tree(process.pid)
                except Exception as e:
                    print(f"Error killing process {process.pid}: {e}")

    def test_gsm8k(self):
        args = SimpleNamespace(
            num_shots=5,
            data_path=None,
            num_questions=200,
            max_new_tokens=512,
            parallel=128,
            host="http://127.0.0.1",
            port=int(self.lb_url.split(":")[-1]),
        )
        metrics = run_eval_few_shot_gsm8k(args)
        print(f"Evaluation metrics: {metrics}")

        self.assertGreater(metrics["accuracy"], 0.62)


if __name__ == "__main__":
    unittest.main()