Make info gatherer monitors resilient with retry loops and timeouts (#1448)
## Motivation Info gatherer monitors could silently stop posting events, causing stale node state after rejoins. The macmon monitor was especially fragile — it had no retry loop, so a crash or parse error would kill it permanently. Worse, the unhandled exception would propagate to the TaskGroup and take down *all* sibling monitors. Additionally, none of the monitors had timeouts on their subprocess calls, so a hung `system_profiler` or `networksetup` could stall a monitor indefinitely. ## Changes - Wrap `_monitor_macmon` in a `while True` retry loop with `except Exception`, matching the pattern used by all other monitors - Add `fail_after` timeouts to all monitor loop bodies: - 10s for lightweight commands (`_monitor_misc`, `_watch_system_info`, `_gather_iface_map` init) - 30s for heavier commands (`_monitor_system_profiler_thunderbolt_data`, `_monitor_thunderbolt_bridge_status`) - Remove unused `CalledProcessError` and `cast` imports ## Why It Works All monitors now follow the same resilient pattern: `while True` → `try` with `fail_after` → `except Exception` (logs warning) → `sleep`. If a subprocess hangs, the timeout fires and `TimeoutError` is caught by the existing `except Exception` handler. If macmon crashes, it restarts after the interval instead of dying permanently. No single monitor failure can cascade to kill the others. ## Test Plan ### Manual Testing <!-- Hardware: macOS with macmon installed --> <!-- What you did: --> - Run exo, kill macmon process (`kill $(pgrep macmon)`), verify it restarts and metrics resume - Verify all monitors continue posting events after simulated hangs ### Automated Testing - All 188 existing tests pass - basedpyright: 0 errors - ruff: all checks passed 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Alex Cheema
@@ -420,7 +420,8 @@ class InfoGatherer:
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return
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while True:
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try:
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await self.info_sender.send(await MiscData.gather())
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with fail_after(10):
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await self.info_sender.send(await MiscData.gather())
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except Exception as e:
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logger.warning(f"Error gathering misc data: {e}")
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await anyio.sleep(self.misc_poll_interval)
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@@ -428,20 +429,26 @@ class InfoGatherer:
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async def _monitor_system_profiler_thunderbolt_data(self):
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if self.system_profiler_interval is None:
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return
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iface_map = await _gather_iface_map()
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if iface_map is None:
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return
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while True:
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try:
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data = await ThunderboltConnectivity.gather()
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assert data is not None
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with fail_after(30):
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iface_map = await _gather_iface_map()
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if iface_map is None:
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raise ValueError("Failed to gather interface map")
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idents = [it for i in data if (it := i.ident(iface_map)) is not None]
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await self.info_sender.send(MacThunderboltIdentifiers(idents=idents))
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data = await ThunderboltConnectivity.gather()
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assert data is not None
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conns = [it for i in data if (it := i.conn()) is not None]
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await self.info_sender.send(MacThunderboltConnections(conns=conns))
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idents = [
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it for i in data if (it := i.ident(iface_map)) is not None
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]
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await self.info_sender.send(
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MacThunderboltIdentifiers(idents=idents)
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)
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conns = [it for i in data if (it := i.conn()) is not None]
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await self.info_sender.send(MacThunderboltConnections(conns=conns))
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except Exception as e:
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logger.warning(f"Error gathering Thunderbolt data: {e}")
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await anyio.sleep(self.system_profiler_interval)
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@@ -469,8 +476,9 @@ class InfoGatherer:
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return
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while True:
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try:
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nics = await get_network_interfaces()
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await self.info_sender.send(NodeNetworkInterfaces(ifaces=nics))
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with fail_after(10):
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nics = await get_network_interfaces()
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await self.info_sender.send(NodeNetworkInterfaces(ifaces=nics))
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except Exception as e:
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logger.warning(f"Error gathering network interfaces: {e}")
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await anyio.sleep(self.interface_watcher_interval)
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@@ -480,9 +488,10 @@ class InfoGatherer:
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return
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while True:
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try:
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curr = await ThunderboltBridgeInfo.gather()
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if curr is not None:
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await self.info_sender.send(curr)
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with fail_after(30):
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curr = await ThunderboltBridgeInfo.gather()
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if curr is not None:
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await self.info_sender.send(curr)
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except Exception as e:
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logger.warning(f"Error gathering Thunderbolt Bridge status: {e}")
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await anyio.sleep(self.thunderbolt_bridge_poll_interval)
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@@ -514,26 +523,35 @@ class InfoGatherer:
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if self.macmon_interval is None:
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return
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# macmon pipe --interval [interval in ms]
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try:
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async with await open_process(
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[macmon_path, "pipe", "--interval", str(self.macmon_interval * 1000)]
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) as p:
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if not p.stdout:
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logger.critical("MacMon closed stdout")
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return
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async for text in TextReceiveStream(
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BufferedByteReceiveStream(p.stdout)
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):
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await self.info_sender.send(MacmonMetrics.from_raw_json(text))
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except CalledProcessError as e:
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stderr_msg = "no stderr"
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stderr_output = cast(bytes | str | None, e.stderr)
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if stderr_output is not None:
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stderr_msg = (
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stderr_output.decode()
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if isinstance(stderr_output, bytes)
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else str(stderr_output)
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while True:
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try:
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async with await open_process(
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[
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macmon_path,
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"pipe",
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"--interval",
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str(self.macmon_interval * 1000),
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]
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) as p:
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if not p.stdout:
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logger.critical("MacMon closed stdout")
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return
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async for text in TextReceiveStream(
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BufferedByteReceiveStream(p.stdout)
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):
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await self.info_sender.send(MacmonMetrics.from_raw_json(text))
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except CalledProcessError as e:
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stderr_msg = "no stderr"
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stderr_output = cast(bytes | str | None, e.stderr)
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if stderr_output is not None:
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stderr_msg = (
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stderr_output.decode()
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if isinstance(stderr_output, bytes)
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else str(stderr_output)
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)
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logger.warning(
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f"MacMon failed with return code {e.returncode}: {stderr_msg}"
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)
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logger.warning(
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f"MacMon failed with return code {e.returncode}: {stderr_msg}"
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)
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except Exception as e:
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logger.warning(f"Error in macmon monitor: {e}")
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await anyio.sleep(self.macmon_interval)
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