Skip to content

Fail fast when demo services exit #42

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
imran-siddique merged 1 commit into from
Aug 12, 2026
Merged

Fail fast when demo services exit #42

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
9 changes: 6 additions & 3 deletions demo-01-cmcp-in-action/run.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ def _find_cmcp() -> str:
sys.exit("cmcp not found. Run: pip install cmcp-runtime")


def _wait_for_port(port: int, what: str, timeout: float = 60.0) -> None:
def _wait_for_port(port: int, what: str, process=None, timeout: float = 60.0) -> None:
"""Block until something is listening on 127.0.0.1:port.

A fixed sleep used to be enough; cMCP Runtime now does attestation and audit
Expand All @@ -45,6 +45,9 @@ def _wait_for_port(port: int, what: str, timeout: float = 60.0) -> None:
"""
deadline = time.monotonic() + timeout
while time.monotonic() < deadline:
if process is not None and process.poll() is not None:
sys.exit(f"{what} exited with code {process.returncode} before listening on :{port}. "
"See the *.log files in this demo folder.")
try:
with socket.create_connection(("127.0.0.1", port), timeout=1):
return
Expand Down Expand Up @@ -106,7 +109,7 @@ def main() -> None:
[sys.executable, str(REPO_ROOT / "server" / "server.py")],
stdout=server_log, stderr=server_log,
)
_wait_for_port(9001, "MCP filesystem server")
_wait_for_port(9001, "MCP filesystem server", server)

print("-- Starting cMCP Runtime (CMCP_DEV_MODE=1) on :8443 --", flush=True)
env = os.environ.copy()
Expand All @@ -116,7 +119,7 @@ def main() -> None:
stdout=cmcp_log, stderr=cmcp_log,
cwd=SCRIPT_DIR, env=env,
)
_wait_for_port(8443, "cMCP Runtime")
_wait_for_port(8443, "cMCP Runtime", cmcp_proc)

print()
subprocess.run([sys.executable, str(SCRIPT_DIR / "call.py")], check=True)
Expand Down
9 changes: 6 additions & 3 deletions demo-02-policy-swap/run.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -42,7 +42,7 @@ def _find_cmcp() -> str:
sys.exit("cmcp not found. Run: pip install cmcp-runtime")


def _wait_for_port(port: int, what: str, timeout: float = 60.0) -> None:
def _wait_for_port(port: int, what: str, process=None, timeout: float = 60.0) -> None:
"""Block until something is listening on 127.0.0.1:port.

A fixed sleep used to be enough; cMCP Runtime now does attestation and audit
Expand All @@ -51,6 +51,9 @@ def _wait_for_port(port: int, what: str, timeout: float = 60.0) -> None:
"""
deadline = time.monotonic() + timeout
while time.monotonic() < deadline:
if process is not None and process.poll() is not None:
sys.exit(f"{what} exited with code {process.returncode} before listening on :{port}. "
"See the *.log files in this demo folder.")
try:
with socket.create_connection(("127.0.0.1", port), timeout=1):
return
Expand Down Expand Up @@ -156,7 +159,7 @@ def main() -> None:
[sys.executable, str(REPO_ROOT / "server" / "server.py")],
stdout=server_log, stderr=server_log,
)
_wait_for_port(9001, "MCP filesystem server")
_wait_for_port(9001, "MCP filesystem server", server)

env = os.environ.copy()
env["CMCP_DEV_MODE"] = "1"
Expand All @@ -165,7 +168,7 @@ def main() -> None:
stdout=cmcp_log, stderr=cmcp_log,
cwd=SCRIPT_DIR, env=env,
)
_wait_for_port(8443, "cMCP Runtime")
_wait_for_port(8443, "cMCP Runtime", cmcp_proc)

# Step 3: write_file denied
print()
Expand Down
9 changes: 6 additions & 3 deletions demo-04-context-enforcement/run.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ def _find_cmcp() -> str:
sys.exit("cmcp not found. Run: pip install cmcp-runtime")


def _wait_for_port(port: int, what: str, timeout: float = 60.0) -> None:
def _wait_for_port(port: int, what: str, process=None, timeout: float = 60.0) -> None:
"""Block until something is listening on 127.0.0.1:port.

A fixed sleep used to be enough; cMCP Runtime now does attestation and audit
Expand All @@ -45,6 +45,9 @@ def _wait_for_port(port: int, what: str, timeout: float = 60.0) -> None:
"""
deadline = time.monotonic() + timeout
while time.monotonic() < deadline:
if process is not None and process.poll() is not None:
sys.exit(f"{what} exited with code {process.returncode} before listening on :{port}. "
"See the *.log files in this demo folder.")
try:
with socket.create_connection(("127.0.0.1", port), timeout=1):
return
Expand Down Expand Up @@ -106,7 +109,7 @@ def main() -> None:
[sys.executable, str(REPO_ROOT / "server" / "server.py")],
stdout=server_log, stderr=server_log,
)
_wait_for_port(9001, "MCP filesystem server")
_wait_for_port(9001, "MCP filesystem server", server)

print("-- Starting cMCP Runtime (CMCP_DEV_MODE=1) on :8443 --", flush=True)
env = os.environ.copy()
Expand All @@ -116,7 +119,7 @@ def main() -> None:
stdout=cmcp_log, stderr=cmcp_log,
cwd=SCRIPT_DIR, env=env,
)
_wait_for_port(8443, "cMCP Runtime")
_wait_for_port(8443, "cMCP Runtime", cmcp_proc)

print()
subprocess.run([sys.executable, str(SCRIPT_DIR / "call.py")], check=True)
Expand Down
9 changes: 6 additions & 3 deletions demo-05-compliance-domain/run.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ def _find_cmcp() -> str:
sys.exit("cmcp not found. Run: pip install cmcp-runtime")


def _wait_for_port(port: int, what: str, timeout: float = 60.0) -> None:
def _wait_for_port(port: int, what: str, process=None, timeout: float = 60.0) -> None:
"""Block until something is listening on 127.0.0.1:port.

A fixed sleep used to be enough; cMCP Runtime now does attestation and audit
Expand All @@ -45,6 +45,9 @@ def _wait_for_port(port: int, what: str, timeout: float = 60.0) -> None:
"""
deadline = time.monotonic() + timeout
while time.monotonic() < deadline:
if process is not None and process.poll() is not None:
sys.exit(f"{what} exited with code {process.returncode} before listening on :{port}. "
"See the *.log files in this demo folder.")
try:
with socket.create_connection(("127.0.0.1", port), timeout=1):
return
Expand Down Expand Up @@ -106,7 +109,7 @@ def main() -> None:
[sys.executable, str(REPO_ROOT / "server" / "server.py")],
stdout=server_log, stderr=server_log,
)
_wait_for_port(9001, "MCP filesystem server")
_wait_for_port(9001, "MCP filesystem server", server)

print("-- Starting cMCP Runtime (CMCP_DEV_MODE=1) on :8443 --", flush=True)
env = os.environ.copy()
Expand All @@ -116,7 +119,7 @@ def main() -> None:
stdout=cmcp_log, stderr=cmcp_log,
cwd=SCRIPT_DIR, env=env,
)
_wait_for_port(8443, "cMCP Runtime")
_wait_for_port(8443, "cMCP Runtime", cmcp_proc)

print()
subprocess.run([sys.executable, str(SCRIPT_DIR / "call.py")], check=True)
Expand Down
12 changes: 8 additions & 4 deletions demo-10-model-gateway/run.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -18,9 +18,13 @@
PORTS = {"model backend": 9010, "model gateway": 8444, "endpoint": 8500}


def _wait(port, name, timeout=60):
def _wait(port, name, process=None, timeout=60):
deadline = time.time() + timeout
while time.time() < deadline:
if process is not None and process.poll() is not None:
print(f"{name} exited with code {process.returncode} before listening on :{port}. "
"See the *.log files.", file=sys.stderr)
return False
with socket.socket() as s:
s.settimeout(0.5)
if s.connect_ex(("127.0.0.1", port)) == 0:
Expand Down Expand Up @@ -66,21 +70,21 @@ def main():
procs.append(subprocess.Popen(
[sys.executable, str(HERE / "model_server.py")],
stdout=logs["model backend"], stderr=logs["model backend"], env=env, cwd=HERE))
if not _wait(9010, "model backend"):
if not _wait(9010, "model backend", procs[-1]):
return 1

print("-- cMCP gateway on :8444 (CMCP_DEV_MODE=1)")
procs.append(subprocess.Popen(
[cmcp, "start", "--config", config],
stdout=logs["model gateway"], stderr=logs["model gateway"], env=env, cwd=HERE))
if not _wait(8444, "model gateway"):
if not _wait(8444, "model gateway", procs[-1]):
return 1

print("-- OpenAI-compatible endpoint on :8500")
procs.append(subprocess.Popen(
[sys.executable, str(HERE / "endpoint.py")],
stdout=logs["endpoint"], stderr=logs["endpoint"], env=env, cwd=HERE))
if not _wait(8500, "endpoint"):
if not _wait(8500, "endpoint", procs[-1]):
return 1

print()
Expand Down
8 changes: 7 additions & 1 deletion demo.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -172,7 +172,13 @@ def run(idx, title, script, blurb, pause):
except (EOFError, KeyboardInterrupt):
print("\nStopped."); sys.exit(0)
banner(idx, title, blurb)
rc = subprocess.run([sys.executable, str(ROOT / script)]).returncode
try:
rc = subprocess.run(
[sys.executable, str(ROOT / script)], timeout=180
).returncode
except subprocess.TimeoutExpired:
print(_c(f"\n[!] Demo {idx} timed out after 180 seconds.", BOLD))
return 1
if rc != 0:
print(_c(f"\n[!] Demo {idx} exited with code {rc}. See the *.log files in the demo folder.", BOLD))
return rc
Expand Down
11 changes: 7 additions & 4 deletions web-console/run.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,7 @@ def _find_cmcp() -> str:
sys.exit("cmcp not found. Run: pip install cmcp-runtime httpx")


def _wait_for_port(port: int, what: str, timeout: float = 60.0) -> None:
def _wait_for_port(port: int, what: str, process=None, timeout: float = 60.0) -> None:
"""Block until something is listening on 127.0.0.1:port.

A fixed sleep used to be enough; cMCP Runtime now does attestation and audit
Expand All @@ -56,6 +56,9 @@ def _wait_for_port(port: int, what: str, timeout: float = 60.0) -> None:
"""
deadline = time.monotonic() + timeout
while time.monotonic() < deadline:
if process is not None and process.poll() is not None:
sys.exit(f"{what} exited with code {process.returncode} before listening on :{port}. "
"See server.log and cmcp.log in this folder.")
try:
with socket.create_connection(("127.0.0.1", port), timeout=1):
return
Expand Down Expand Up @@ -102,20 +105,20 @@ def main() -> None:
procs.append(subprocess.Popen(
[sys.executable, str(EXAMPLE / "server" / "mock_mcp_server.py")],
stdout=server_log, stderr=server_log))
_wait_for_port(8080, "EU credit-risk MCP server")
_wait_for_port(8080, "EU credit-risk MCP server", procs[-1])

print("-- cMCP gateway on :8443 (CMCP_DEV_MODE=1)", flush=True)
env = os.environ.copy()
env["CMCP_DEV_MODE"] = "1"
procs.append(subprocess.Popen(
[_find_cmcp(), "start", "--config", str(GATEWAY_CFG)],
stdout=cmcp_log, stderr=cmcp_log, env=env))
_wait_for_port(8443, "cMCP gateway")
_wait_for_port(8443, "cMCP gateway", procs[-1])

print(f"-- web console on http://localhost:{PORT}", flush=True)
web = subprocess.Popen([sys.executable, str(HERE / "webserver.py")], env=os.environ.copy())
procs.append(web)
_wait_for_port(int(PORT), "web console")
_wait_for_port(int(PORT), "web console", web)

url = f"http://localhost:{PORT}"
print(f"\nOpen {url} (opening it for you now). Ctrl+C to stop.\n", flush=True)
Expand Down