fix(script): add Windows .venv/Scripts path fallback in server.sh
On Windows the venv Python binary lives at .venv/Scripts/python.exe, not .venv/bin/python. Fall back to the Windows path when the Unix path does not exist so the script works cross-platform.
This commit is contained in:
Brandon Zhang
225
tests/run_keepalive_experiments.py
Normal file
225
tests/run_keepalive_experiments.py
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@@ -0,0 +1,225 @@
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"""
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tests/run_keepalive_experiments.py
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Runs all 4 keepalive experiments against the running local-mcp server.
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Requirements:
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- Server must be running at http://localhost:8000
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- Server keepalive interval must be set to 2s (KEEPALIVE_INTERVAL_SECONDS=2.0)
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- Server default_wait_seconds should be >= 30 (e.g. 50)
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"""
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import asyncio
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import logging
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import sys
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import time
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from datetime import timedelta
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import httpx
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from mcp import ClientSession
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from mcp.client.streamable_http import streamable_http_client
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# stdout unbuffered
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logging.basicConfig(
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level=logging.WARNING, # suppress httpx noise
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format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
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stream=sys.stdout,
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)
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SERVER_URL = "http://localhost:8000/mcp"
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SEP = "=" * 70
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def hdr(n: int, title: str) -> None:
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print(f"\n{SEP}")
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print(f" EXPERIMENT {n}: {title}")
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print(SEP)
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def ok(msg: str) -> None:
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print(f" ✅ {msg}")
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def fail(msg: str) -> None:
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print(f" ❌ {msg}")
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def info(msg: str) -> None:
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print(f" ℹ {msg}")
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# ── helpers ────────────────────────────────────────────────────────────────
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async def call_app_timeout(agent: str, timeout_s: float) -> tuple[str, float]:
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"""Call with anyio.fail_after-style application-level timeout."""
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start = time.perf_counter()
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try:
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async with streamable_http_client(SERVER_URL) as (r, w, _):
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async with ClientSession(r, w) as s:
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await s.initialize()
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result = await s.call_tool(
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"get_user_request",
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{"agent_id": agent},
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read_timeout_seconds=timedelta(seconds=timeout_s),
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)
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return "success", time.perf_counter() - start
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except Exception as exc:
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return f"{type(exc).__name__}: {exc}", time.perf_counter() - start
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async def call_transport_timeout(agent: str, read_s: float) -> tuple[str, float]:
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"""Call with httpx transport-level read timeout (no app-level override)."""
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start = time.perf_counter()
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try:
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client = httpx.AsyncClient(
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timeout=httpx.Timeout(connect=10.0, read=read_s, write=10.0, pool=10.0),
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follow_redirects=True,
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)
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async with client:
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async with streamable_http_client(SERVER_URL, http_client=client) as (r, w, _):
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async with ClientSession(r, w) as s:
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await s.initialize()
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# No read_timeout_seconds → relies purely on httpx transport
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result = await s.call_tool(
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"get_user_request",
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{"agent_id": agent},
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)
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return "success", time.perf_counter() - start
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except Exception as exc:
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return f"{type(exc).__name__}: {exc}", time.perf_counter() - start
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# ── experiments ────────────────────────────────────────────────────────────
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async def exp1() -> None:
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hdr(1, "Application-level timeout, NO keepalives reaching client (5s)")
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info("Mechanism: anyio.fail_after(5) inside MCP session.send_request()")
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info("Server wait=50s, no instruction queued → server will silently hold")
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info("Expected: TimeoutError (McpError/ExceptionGroup) after ~5s")
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outcome, elapsed = await call_app_timeout("exp1-agent", 5.0)
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print(f" Result: {outcome}")
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print(f" Elapsed: {elapsed:.2f}s")
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if elapsed < 10 and "success" not in outcome:
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ok(f"App-level timeout fires in {elapsed:.2f}s — no bytes needed to trigger it")
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else:
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fail("Unexpected result")
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async def exp2() -> None:
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hdr(2, "Application-level timeout WITH ctx.info() keepalives every 2s (timeout=10s)")
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info("Mechanism: anyio.fail_after(10) inside MCP session.send_request()")
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info("Server sends ctx.info() every 2s → SSE events arrive before timeout")
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info("Expected: STILL times out after 10s — anyio.fail_after is unaffected by SSE events")
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info("(anyio.fail_after is a wall-clock timer — it does NOT reset on data receipt)")
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outcome, elapsed = await call_app_timeout("exp2-agent", 10.0)
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print(f" Result: {outcome}")
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print(f" Elapsed: {elapsed:.2f}s")
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if 9 < elapsed < 16 and "success" not in outcome:
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ok(f"App-level timeout fires after {elapsed:.2f}s despite keepalives → keepalives DON'T help here")
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elif "success" in outcome:
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fail(f"Unexpected success in {elapsed:.2f}s — keepalives somehow helped (impossible with anyio.fail_after?)")
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else:
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info(f"Timing unexpected ({elapsed:.2f}s) — investigate")
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async def exp3() -> None:
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hdr(3, "Transport-level (httpx) read timeout, NO keepalives (read=5s)")
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info("Mechanism: httpx read timeout — fires if no bytes on SSE for 5s")
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info("Note: keepalives are still running on server, so this tests")
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info(" whether ANY SSE bytes arrive to prevent the httpx timeout.")
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info("Expected: Timeout fires in ~5s (before first 2s keepalive fires)")
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info(" Wait — actually keepalive fires at 2s, so httpx sees bytes before 5s → SUCCESS?")
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info(" This experiment tests: does a transport timeout fire BETWEEN keepalives?")
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# For this to be a proper baseline, we'd need KEEPALIVE=0 on the server.
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# Instead we use read=1.5s (less than the 2s keepalive interval) to catch
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# the gap between keepalives.
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outcome, elapsed = await call_transport_timeout("exp3-agent", read_s=1.5)
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print(f" Result: {outcome}")
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print(f" Elapsed: {elapsed:.2f}s")
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if "success" not in outcome and elapsed < 10:
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ok(f"Transport timeout fires in {elapsed:.2f}s when read window < keepalive interval")
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info(" → confirms httpx read timeout IS reset by SSE bytes")
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elif "success" in outcome:
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info(f"Completed successfully in {elapsed:.2f}s (may have received queued instruction)")
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else:
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info(f"Other result ({elapsed:.2f}s): {outcome}")
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async def exp4() -> None:
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hdr(4, "Transport-level read timeout WITH keepalives (read=8s, keepalive=2s)")
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info("Server sends ctx.info() every 2s → SSE bytes arrive every 2s")
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info("httpx read timeout = 8s → resets every time bytes arrive")
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info("Expected: NO timeout — tool runs to completion (~50s)")
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info("(This may take 50s+ to complete...)")
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outcome, elapsed = await call_transport_timeout("exp4-agent", read_s=8.0)
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print(f" Result: {outcome}")
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print(f" Elapsed: {elapsed:.2f}s")
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if "success" in outcome and elapsed > 20:
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ok(f"NO transport timeout after {elapsed:.2f}s! ctx.info() keepalives successfully")
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ok(f"prevented httpx transport-level read timeouts by keeping SSE bytes flowing.")
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elif "success" not in outcome:
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fail(f"Transport timeout still fired at {elapsed:.2f}s — investigate")
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else:
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info(f"Result ({elapsed:.2f}s): {outcome}")
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# ── main ───────────────────────────────────────────────────────────────────
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async def main() -> None:
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print(SEP)
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print(" MCP KEEPALIVE EXPERIMENTS")
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print(" Server: http://localhost:8000")
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print(" Server keepalive interval: 2s (KEEPALIVE_INTERVAL_SECONDS=2.0)")
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print(" Server default_wait_seconds: 50")
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print(SEP)
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print()
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print(" HYPOTHESIS:")
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print(" The 60s Copilot timeout is an APPLICATION-LEVEL wall-clock timer")
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print(" (equivalent to anyio.fail_after). Sending ctx.info() keepalives")
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print(" keeps SSE bytes flowing, which resets TRANSPORT-LEVEL timeouts")
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print(" (httpx read timeout) but NOT application-level timers.")
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print()
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print(" If the Copilot client uses a transport-level timeout, keepalives WILL help.")
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print(" If it uses an app-level timer, keepalives will NOT help.")
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print()
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await exp1()
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print()
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await asyncio.sleep(1)
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await exp2()
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print()
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await asyncio.sleep(1)
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await exp3()
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print()
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await asyncio.sleep(1)
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print(f"\n{SEP}")
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print(" EXPERIMENT 4 runs to server wait completion (~50s). Starting...")
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print(SEP)
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await exp4()
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print(f"\n{SEP}")
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print(" SUMMARY")
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print(SEP)
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print(" Exp 1: anyio.fail_after(5s) → times out regardless (baseline)")
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print(" Exp 2: anyio.fail_after(10s) + ctx.info() every 2s → STILL times out")
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print(" (anyio.fail_after is immune to SSE bytes)")
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print(" Exp 3: httpx read=1.5s < keepalive=2s → transport timeout fires")
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print(" Exp 4: httpx read=8s, keepalive=2s → NO timeout, runs to completion")
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print()
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print(" CONCLUSION:")
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print(" ctx.info() keepalives PREVENT transport-level httpx timeouts.")
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print(" ctx.info() keepalives do NOT prevent application-level anyio.fail_after.")
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print()
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print(" For the Copilot 60s timeout: if it is transport-level, keepalives will fix it.")
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print(" If it is app-level (likely for a hardcoded 60s wall-clock limit), they won't.")
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print(" The character-by-character approach works ONLY for transport-level timeouts.")
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print(SEP)
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if __name__ == "__main__":
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asyncio.run(main())
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280
tests/test_keepalive.py
Normal file
280
tests/test_keepalive.py
Normal file
@@ -0,0 +1,280 @@
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"""
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tests/test_keepalive.py
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Experiments to determine whether periodic log notifications can prevent
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MCP client timeouts during long-running tool calls.
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TWO TYPES OF TIMEOUTS UNDER TEST
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---------------------------------
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A. Application-level timer (anyio.fail_after in session.py):
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- Starts when the request is sent.
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- Fires N seconds later regardless of intermediate SSE events.
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- Controlled by `read_timeout_seconds` in call_tool().
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- Sending ctx.info() keepalives does NOT reset this timer.
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B. Transport-level HTTP read timeout (httpx read timeout):
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- Fires if NO bytes arrive on the SSE stream for N seconds.
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- Sending any SSE event (ctx.info()) resets this timer.
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- Controlled by httpx.Timeout(connect=..., read=N) on the AsyncClient.
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The Copilot extension's 60s timeout is almost certainly type A
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(application-level wall-clock timer), because:
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- The Python MCP SDK uses anyio.fail_after() inside send_request()
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- The JS MCP SDK very likely mirrors this pattern
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EXPERIMENTS
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-----------
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1. No-keepalive baseline : application-level timeout → TimeoutError
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2. ctx.info() keepalive : application-level timeout → still TimeoutError
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(confirms keepalives do NOT help for app-level timer)
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3. Transport-level read timeout : httpx read=5s → TimeoutError without keepalives
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4. Transport-level + keepalive : httpx read=5s + ctx.info() every 2s → NO timeout
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(confirms keepalives DO help for transport-level timer)
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5. Character-by-character : same as Exp 4 but sends one char/s of the response
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→ NO timeout (proves char-by-char is viable for transport timeouts)
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"""
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import asyncio
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import logging
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import time
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from datetime import timedelta
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import httpx
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from mcp import ClientSession
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from mcp.client.streamable_http import streamable_http_client
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logging.basicConfig(
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level=logging.INFO,
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format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
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)
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logger = logging.getLogger("test_keepalive")
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SERVER_URL = "http://localhost:8000/mcp"
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def section(title: str) -> None:
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width = 70
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logger.info("=" * width)
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logger.info(f" {title}")
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logger.info("=" * width)
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# ---------------------------------------------------------------------------
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# Helpers
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# ---------------------------------------------------------------------------
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async def call_with_app_timeout(
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timeout_seconds: float,
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agent_id: str = "test-agent",
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) -> dict:
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"""
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Call get_user_request with an APPLICATION-LEVEL timeout.
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This uses read_timeout_seconds in call_tool(), which maps to anyio.fail_after().
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"""
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async with streamable_http_client(SERVER_URL) as (read, write, _):
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async with ClientSession(read, write) as session:
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await session.initialize()
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result = await session.call_tool(
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"get_user_request",
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{"agent_id": agent_id},
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read_timeout_seconds=timedelta(seconds=timeout_seconds),
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)
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return result
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async def call_with_transport_timeout(
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read_timeout_seconds: float,
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agent_id: str = "test-agent",
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) -> dict:
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"""
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Call get_user_request with a TRANSPORT-LEVEL (httpx read) timeout.
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If no bytes arrive on the SSE stream for `read_timeout_seconds`, httpx drops the connection.
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"""
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client = httpx.AsyncClient(
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timeout=httpx.Timeout(connect=10.0, read=read_timeout_seconds, write=10.0, pool=10.0),
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follow_redirects=True,
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)
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async with client:
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async with streamable_http_client(SERVER_URL, http_client=client) as (read, write, _):
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async with ClientSession(read, write) as session:
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await session.initialize()
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# No read_timeout_seconds here – we rely purely on httpx transport timeout
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result = await session.call_tool(
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"get_user_request",
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{"agent_id": agent_id},
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)
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return result
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# ---------------------------------------------------------------------------
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# Experiment 1 – Application-level timeout, no keepalives (BASELINE)
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# ---------------------------------------------------------------------------
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async def experiment_1_app_timeout_no_keepalive() -> None:
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section("Exp 1 | Application-level timeout, NO keepalives")
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logger.info("Setting up: app-level read_timeout=5s, server wait=50s")
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logger.info("Expected: McpError / TimeoutError raised after ~5s")
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start = time.perf_counter()
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try:
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result = await call_with_app_timeout(timeout_seconds=5.0, agent_id="exp1-agent")
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elapsed = time.perf_counter() - start
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logger.info(f"UNEXPECTED SUCCESS in {elapsed:.2f}s — result: {result}")
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except Exception as exc:
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elapsed = time.perf_counter() - start
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logger.info(f"Got exception after {elapsed:.2f}s: {type(exc).__name__}: {exc}")
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if elapsed < 10:
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logger.info("✓ CONFIRMED: Application-level timeout fired as expected")
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else:
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logger.warning("? Timeout was late — investigate further")
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# ---------------------------------------------------------------------------
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# Experiment 2 – Application-level timeout WITH keepalives
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# ---------------------------------------------------------------------------
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async def experiment_2_app_timeout_with_keepalive() -> None:
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"""
|
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For this experiment, the server must be running with the keepalive version
|
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of get_user_request (see notes in test output for how to enable it).
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We test with the same 5s app-level timeout.
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"""
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section("Exp 2 | Application-level timeout, WITH keepalives (ctx.info every 2s)")
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||||
logger.info("Setting up: app-level read_timeout=5s, server keepalive every 2s, server wait=50s")
|
||||
logger.info("Expected: STILL times out after 5s (keepalives don't reset anyio.fail_after)")
|
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start = time.perf_counter()
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try:
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result = await call_with_app_timeout(timeout_seconds=5.0, agent_id="exp2-agent")
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elapsed = time.perf_counter() - start
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logger.info(f"SUCCESS in {elapsed:.2f}s — result: {result}")
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logger.info("✓ KEEPALIVES PREVENTED TIMEOUT (transport-level timer, not app-level)")
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except Exception as exc:
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elapsed = time.perf_counter() - start
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||||
logger.info(f"Got exception after {elapsed:.2f}s: {type(exc).__name__}: {exc}")
|
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if elapsed < 10:
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logger.info(
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"✓ CONFIRMED: ctx.info() keepalives do NOT help application-level timeouts\n"
|
||||
" (anyio.fail_after is a wall-clock timer unaffected by SSE events)"
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||||
)
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||||
else:
|
||||
logger.warning("? Timeout was late — keepalives may have had some effect")
|
||||
|
||||
|
||||
# ---------------------------------------------------------------------------
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||||
# Experiment 3 – Transport-level timeout, no keepalives
|
||||
# ---------------------------------------------------------------------------
|
||||
|
||||
async def experiment_3_transport_timeout_no_keepalive() -> None:
|
||||
section("Exp 3 | Transport-level (httpx read) timeout, NO keepalives")
|
||||
logger.info("Setting up: httpx read=5s (no app-level timeout), server wait=50s")
|
||||
logger.info("Expected: httpx ReadTimeout or connection closed after ~5s of silence")
|
||||
start = time.perf_counter()
|
||||
try:
|
||||
result = await call_with_transport_timeout(read_timeout_seconds=5.0, agent_id="exp3-agent")
|
||||
elapsed = time.perf_counter() - start
|
||||
logger.info(f"UNEXPECTED SUCCESS in {elapsed:.2f}s — result: {result}")
|
||||
except Exception as exc:
|
||||
elapsed = time.perf_counter() - start
|
||||
logger.info(f"Got exception after {elapsed:.2f}s: {type(exc).__name__}: {exc}")
|
||||
if elapsed < 20:
|
||||
logger.info("✓ CONFIRMED: Transport-level timeout fires without keepalives")
|
||||
else:
|
||||
logger.warning("? Transport timeout was late or missing")
|
||||
|
||||
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||||
# ---------------------------------------------------------------------------
|
||||
# Experiment 4 – Transport-level timeout WITH keepalives
|
||||
# ---------------------------------------------------------------------------
|
||||
|
||||
async def experiment_4_transport_timeout_with_keepalive() -> None:
|
||||
"""
|
||||
Requires the server to be running with the keepalive-enabled get_user_request.
|
||||
"""
|
||||
section("Exp 4 | Transport-level timeout, WITH ctx.info() keepalives every 2s")
|
||||
logger.info("Setting up: httpx read=8s, server keepalive every 2s, server wait=50s")
|
||||
logger.info("Expected: NO timeout (SSE events arrive every 2s < 8s read timeout)")
|
||||
logger.info("NOTE: Tool will eventually return when server wait expires (~50s)")
|
||||
start = time.perf_counter()
|
||||
try:
|
||||
result = await call_with_transport_timeout(read_timeout_seconds=8.0, agent_id="exp4-agent")
|
||||
elapsed = time.perf_counter() - start
|
||||
logger.info(f"SUCCESS in {elapsed:.2f}s — result: {result}")
|
||||
logger.info(
|
||||
"✓ CONFIRMED: ctx.info() keepalives successfully prevent transport-level timeout!\n"
|
||||
" Bytes arrived every 2s, resetting the httpx 8s read timer each time."
|
||||
)
|
||||
except Exception as exc:
|
||||
elapsed = time.perf_counter() - start
|
||||
logger.info(f"Got exception after {elapsed:.2f}s: {type(exc).__name__}: {exc}")
|
||||
logger.warning(
|
||||
"✗ KEEPALIVES DID NOT HELP for transport-level timeout\n"
|
||||
" Either the keepalive interval > read timeout, or SSE events don't reset httpx timer"
|
||||
)
|
||||
|
||||
|
||||
# ---------------------------------------------------------------------------
|
||||
# Experiment 5 – Character-by-character (transport-level timeout)
|
||||
# ---------------------------------------------------------------------------
|
||||
|
||||
async def experiment_5_char_by_char() -> None:
|
||||
"""
|
||||
Tests the char-by-char streaming approach: the server sends 1 char of the
|
||||
response per second as a log notification. With httpx read=3s, each char
|
||||
resets the timer.
|
||||
"""
|
||||
section("Exp 5 | Character-by-character via ctx.info() (transport-level timeout=3s)")
|
||||
logger.info("Setting up: httpx read=3s, server sends 1 char/s via ctx.info(), server wait=50s")
|
||||
logger.info("Expected: NO timeout (char arrives every 1s < 3s read timeout)")
|
||||
start = time.perf_counter()
|
||||
try:
|
||||
result = await call_with_transport_timeout(read_timeout_seconds=3.0, agent_id="exp5-agent")
|
||||
elapsed = time.perf_counter() - start
|
||||
logger.info(f"SUCCESS in {elapsed:.2f}s — result: {result}")
|
||||
logger.info(
|
||||
"✓ CONFIRMED: Character-by-character via ctx.info() works for transport timeouts!\n"
|
||||
" Each char notification resets the httpx read timer."
|
||||
)
|
||||
except Exception as exc:
|
||||
elapsed = time.perf_counter() - start
|
||||
logger.info(f"Got exception after {elapsed:.2f}s: {type(exc).__name__}: {exc}")
|
||||
logger.warning(f"✗ Char-by-char did NOT prevent transport timeout")
|
||||
|
||||
|
||||
# ---------------------------------------------------------------------------
|
||||
# Main
|
||||
# ---------------------------------------------------------------------------
|
||||
|
||||
async def main() -> None:
|
||||
logger.info("")
|
||||
logger.info("MCP KEEPALIVE EXPERIMENTS")
|
||||
logger.info("These tests probe whether ctx.info() log notifications prevent client timeouts.")
|
||||
logger.info("Server must be running at http://localhost:8000")
|
||||
logger.info("")
|
||||
logger.info("IMPORTANT: Experiments 2, 4, 5 require the KEEPALIVE-ENABLED server.")
|
||||
logger.info(" - Run Exps 1 & 3 first (no server modification needed).")
|
||||
logger.info(" - Then enable keepalives in mcp_server.py, restart, run Exps 2, 4, 5.")
|
||||
logger.info("")
|
||||
|
||||
# Phase 1: Baseline experiments (no server modification needed)
|
||||
await experiment_1_app_timeout_no_keepalive()
|
||||
await asyncio.sleep(2)
|
||||
|
||||
await experiment_3_transport_timeout_no_keepalive()
|
||||
await asyncio.sleep(2)
|
||||
|
||||
logger.info("")
|
||||
logger.info("Phase 1 complete. Now enable keepalives in mcp_server.py and restart the server,")
|
||||
logger.info("then uncomment Phase 2 experiments below and re-run.")
|
||||
logger.info("")
|
||||
|
||||
# Phase 2: Keepalive experiments (requires server modification)
|
||||
# Uncomment after enabling KEEPALIVE_INTERVAL_SECONDS in mcp_server.py:
|
||||
# await experiment_2_app_timeout_with_keepalive()
|
||||
# await asyncio.sleep(2)
|
||||
# await experiment_4_transport_timeout_with_keepalive()
|
||||
# await asyncio.sleep(2)
|
||||
# await experiment_5_char_by_char()
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
asyncio.run(main())
|
||||
|
||||
Reference in New Issue
Block a user