fix(factory): fail closed on broker control-plane faults - #281
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📝 WalkthroughWalkthroughThe PR adds configurable fleet control-plane health checks, circuit breaking for roster and mutation operations, factory admission checks, status reporting, dedicated broker path validation, and a default ChangesFleet control-plane health
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The live dispatch path can count a control-plane admission failure as a dispatch attempt even though no worker was spawned, which may exhaust retries and terminalize work during an outage. This should be corrected or explicitly accepted before merging. Sequence Diagram(s)sequenceDiagram
participant Factory
participant FleetControlPlaneCircuit
participant FleetClient
Factory->>FleetControlPlaneCircuit: probe roster before discovery
FleetControlPlaneCircuit->>FleetClient: request roster with timeout
FleetClient-->>FleetControlPlaneCircuit: roster or failure
FleetControlPlaneCircuit-->>Factory: probe result and circuit status
Factory->>FleetControlPlaneCircuit: request spawn or resume
FleetControlPlaneCircuit->>FleetClient: execute mutation when closed
Possibly related PRs
Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Lane correction from factory-lead — read this before touching the worktree
Verified state, 2026-08-17 08:45Z
DO NOT, under any circumstance
The work is already backed upI have taken a non-destructive snapshot before any of this: a 583-line diff of all 9 files, saved to two locations on separate paths, one of them outside Required sequence
Still owed on this PR, unchanged from the original briefThe uncommitted edits reportedly add roster preflight before every spawn/resume on direct dispatch paths, circuit state in the daemon heartbeat, loop termination when the circuit opens, shared default constants, tests and operator docs. When they land, the five judgement criteria stand — and two of them are not yet evidenced here:
CI here reads No merge. The principal owns that gate. |
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All reported issues were addressed
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Actionable comments posted: 2
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Inline comments:
In `@src/orchestrator/factory.test.ts`:
- Around line 50-79: Update the FactoryConfigOverrides type used by config so
fleetHealth overrides are partial, allowing callers to provide only selected
fields such as rosterTimeoutMs, failureThreshold, and resetTimeoutMs while
retaining defaults for omitted fields like requireDedicatedBroker.
In `@src/orchestrator/factory.ts`:
- Around line 2142-2158: Move the fleet control-plane admission check in the
live dispatch path ahead of `#recordDispatchAttempt`(), ensuring an open circuit
rejects or defers dispatch before any attempt is counted. Update the flow around
`#dispatchUnlocked`() and `#spawnAgent`() while preserving failure accounting for
genuine post-admission dispatch failures.
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Fix all unresolved CodeRabbit comments on this PR:
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📒 Files selected for processing (11)
README.mdsrc/cli/fleet.test.tssrc/cli/fleet.tssrc/config/schema.test.tssrc/config/schema.tssrc/fleet/control-plane-circuit.test.tssrc/fleet/control-plane-circuit.tssrc/index.tssrc/orchestrator/factory.test.tssrc/orchestrator/factory.tssrc/types.ts
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All reported issues were addressed across 9 files (changes from recent commits).
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2 issues found across 11 files
Prompt for AI agents (unresolved issues)
Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.
<file name="src/cli/fleet.ts">
<violation number="1" location="src/cli/fleet.ts:1743">
P2: When `realpathSync.native(existingAncestor)` throws (for example EACCES/EPERM resolving an existing directory), `canonicalPath` silently returns the unresolved `absolute` path. `sameFilesystemPath` then compares the unresolvable candidate rather than its real (symlink-resolved) path, which can let `resolveFactoryBrokerConnectionPath` false-pass the dedicated-broker isolation check and allow Factory to share the interactive project broker. In a hardening PR whose whole point is to fail closed on sharing the project broker, this error path fails open. At minimum log/detect the failure instead of falling back to the unverified path, so an isolation check that cannot be evaluated is treated as an error rather than a pass.</violation>
</file>
<file name="src/orchestrator/factory.ts">
<violation number="1" location="src/orchestrator/factory.ts:2182">
P3: When the circuit is already `open`, `this.#fleet.roster()` (the guarded probe) throws immediately without contacting the broker, but this catch still increments `fleetControlPlaneProbeFailures` and logs a full 'control plane unavailable' error. Every open-circuit rejection is therefore mislabeled as a new probe failure and re-emitted as an operator error even though no probe ran and `health.lastError` is stale (it holds the original fault that opened the circuit). Count/log the failure only when the circuit was not already open, or short-circuit earlier so open-state admissions surface as a distinct, reduced-signal path.</violation>
</file>
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| } | ||
| try { | ||
| return resolve(realpathSync.native(existingAncestor), ...missingSegments) | ||
| } catch { |
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P2: When realpathSync.native(existingAncestor) throws (for example EACCES/EPERM resolving an existing directory), canonicalPath silently returns the unresolved absolute path. sameFilesystemPath then compares the unresolvable candidate rather than its real (symlink-resolved) path, which can let resolveFactoryBrokerConnectionPath false-pass the dedicated-broker isolation check and allow Factory to share the interactive project broker. In a hardening PR whose whole point is to fail closed on sharing the project broker, this error path fails open. At minimum log/detect the failure instead of falling back to the unverified path, so an isolation check that cannot be evaluated is treated as an error rather than a pass.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. At src/cli/fleet.ts, line 1743:
<comment>When `realpathSync.native(existingAncestor)` throws (for example EACCES/EPERM resolving an existing directory), `canonicalPath` silently returns the unresolved `absolute` path. `sameFilesystemPath` then compares the unresolvable candidate rather than its real (symlink-resolved) path, which can let `resolveFactoryBrokerConnectionPath` false-pass the dedicated-broker isolation check and allow Factory to share the interactive project broker. In a hardening PR whose whole point is to fail closed on sharing the project broker, this error path fails open. At minimum log/detect the failure instead of falling back to the unverified path, so an isolation check that cannot be evaluated is treated as an error rather than a pass.</comment>
<file context>
@@ -1678,6 +1691,60 @@ export function resolveBrokerConnectionPath(
+ }
+ try {
+ return resolve(realpathSync.native(existingAncestor), ...missingSegments)
+ } catch {
+ return absolute
+ }
</file context>
| this.#increment('fleetControlPlaneProbeSuccesses') | ||
| } catch (error) { | ||
| const health = this.#fleetControlPlane.status() | ||
| this.#increment('fleetControlPlaneProbeFailures') |
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P3: When the circuit is already open, this.#fleet.roster() (the guarded probe) throws immediately without contacting the broker, but this catch still increments fleetControlPlaneProbeFailures and logs a full 'control plane unavailable' error. Every open-circuit rejection is therefore mislabeled as a new probe failure and re-emitted as an operator error even though no probe ran and health.lastError is stale (it holds the original fault that opened the circuit). Count/log the failure only when the circuit was not already open, or short-circuit earlier so open-state admissions surface as a distinct, reduced-signal path.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. At src/orchestrator/factory.ts, line 2182:
<comment>When the circuit is already `open`, `this.#fleet.roster()` (the guarded probe) throws immediately without contacting the broker, but this catch still increments `fleetControlPlaneProbeFailures` and logs a full 'control plane unavailable' error. Every open-circuit rejection is therefore mislabeled as a new probe failure and re-emitted as an operator error even though no probe ran and `health.lastError` is stale (it holds the original fault that opened the circuit). Count/log the failure only when the circuit was not already open, or short-circuit earlier so open-state admissions surface as a distinct, reduced-signal path.</comment>
<file context>
@@ -2161,8 +2173,29 @@ export class FactoryLoop implements Factory {
+ this.#increment('fleetControlPlaneProbeSuccesses')
+ } catch (error) {
+ const health = this.#fleetControlPlane.status()
+ this.#increment('fleetControlPlaneProbeFailures')
+ if (health.state === 'open') this.#increment('fleetControlPlaneCircuitOpen')
+ this.#logger.error?.('[factory] fleet control plane unavailable; dispatch paused', {
</file context>
1 participant
Summary
Factory previously treated an HTTP-responsive Agent Relay listener as sufficient even when the broker's serialized control path could no longer answer roster or mutation requests. This change makes dispatch fail closed on that control path, makes the paused state operator-visible, lowers the default admission rate, and adds an opt-in guard against sharing broker state with an interactive project.
Mutating spawn/resume calls deliberately have no client-side abandonment timeout: once a mutation may have reached the broker, a late acceptance is ambiguous and could orphan a worker. Bounded roster failures and transport-class spawn/resume rejections drive circuit health; domain rejections do not.
Changes
FleetControlPlaneCircuitaround the fleet clientfactory statusbatchSizefrom 5 to 1 (explicit opt-up remains capped at 5)fleetHealth.requireDedicatedBroker, including canonical/symlink-equivalent path checksFive review gates
1. Invocation and wiring
Headline inherited finding: the initial implementation was only partially wired. Discovery called the guarded roster, and mutations were blocked if an already-open circuit reached them, but the mutation proxy merely asserted the current state. A fresh Factory instance begins closed, so resume/cold-start paths that did not first run discovery could bypass a real control-plane admission request. This PR now probes inside the central mutation guard before it permits the effect.
src/orchestrator/factory.ts:744-750.src/orchestrator/factory.ts:2144-2167, beforeclaimDiscoverySweepand therefore before issue reads/spawns.src/orchestrator/factory.ts:3675-3682, before preview creation, lifecycle claims, or the dispatch-attempt write at line 3782.src/fleet/control-plane-circuit.ts:141-163: line 147 awaits the roster probe, line 148 asserts state, and only line 149 invokes the mutation.#fleetproxy. The seven call sites are spawn atfactory.ts:7324,7665,8745, and14819, and resume at8613,13517, and14790. The ordinary direct-dispatch path also performs its adoption roster lookup atfactory.ts:7296-7324; the central guard is what closes the alternate-path gap.2. The probe observes the wedged plane
This is not
/health, HTTP listener liveness, or a timer-written heartbeat.roster()calls#listLiveAgents()atsrc/fleet/internal-fleet-client.ts:347-348, which calls Harness DriverlistAgents()at:974-978.GET /api/spawned. In Agent Relay, that route enqueuesListenApiRequest::Listand awaits its oneshot response (listen_api.rs:1153-1167); the serialized broker API handler services it and readsworkers.list(...)(runtime/api.rs:1197-1200). A listener that accepts HTTP while that actor is wedged cannot complete the probe.worker.rs:267-288), changed by worker lifecycle operations rather than a heartbeat timer. This is not a monotonic activity counter; the decisive signal is successful completion of a request that the serialized control actor itself must service.3. Recovery and operator-visible failure
factory statusprefers the live daemon heartbeat'sfleetControlPlaneover a fresh local Factory instance atsrc/cli/fleet.ts:1141-1177. It exposesstate, sanitizedlastError, andretryAtMs; a live older daemon that predates the field reports it as unknown/absent instead of falselyclosed. Admission logging uses the sanitized value rather than raw transport text.FleetControlPlaneCircuitOpenErroratsrc/orchestrator/factory.ts:3496-3514, so it does not return a successful “no work” result. A run-once probe failure likewise rejects and exits non-zero through the CLI.README.md:152-174: raiserosterTimeoutMswhen measured latency legitimately exceeds the bound, otherwise repair the isolated broker, wait untilretryAtMs, and let one successful half-open roster probe close the circuit. The timeout, failure threshold, and cooldown are all configurable within schema bounds.requireDedicatedBrokeris the production escape from taking an unrelated interactive broker hostage.4. Must-fire and must-not-fire at the real boundary
The production constants are exported once at
src/fleet/control-plane-circuit.ts:3-5and consumed directly by the schema atsrc/config/schema.ts:65-70.control-plane-circuit.test.ts:22advances exactly 5,000 ms twice, verifies the 60,000 ms open interval, and verifies that only a successful half-open probe closes it.:133proves two wedged roster admissions open the circuit and the next spawn fails fast without a roster or spawn call. The Factory integration atfactory.test.ts:64proves the same boundary occurs before discovery. The new explicit race regression also proves a pre-open roster probe cannot satisfy a later caller or close the circuit after concurrent mutation transport failures open it.control-plane-circuit.test.ts:63verifies a 4,999 ms successful probe and one isolated 5,000 ms failure leave the circuit closed.factory.test.ts:107, including proof that admission failure consumes no dispatch attempt; the non-zero loop/heartbeat behavior is:158.48bd2df, the explicit race test started a roster probe, opened the circuit with interleaved spawn/resume transport failures, then made a later roster call before resolving the stale probe. Exit code was 1 because the later call waited instead of failing fast. The production worktree was untouched.5. Coalescing correctness
FleetControlPlaneCircuit.probe()checks open state before coalescing, captures the circuit's open generation, and rechecks both after the shared roster request settles. A probe that began before a concurrent open transition can neither satisfy callers nor close the circuit, even when it resolves after cooldown. Failed probes are not cached, and a fresh successful half-open probe is still required to close. The explicit concurrency regression interleaves a pending roster request with spawn/resume timeout failures and verifies the stale result is fenced.Duplicate and overlap audit
The branch includes current
mainat4f619e9, including the adjacent placement, work-unit identity, exit-code, and document-state-store changes. The merge preserves named-node placement/release behavior, document-state status reporting, and the circuit admission seams. No other open Factory PR implements this roster deadline/circuit.Validation
npm run build— exit 00672fca— 1,731 passed, 1 skipped (1,732 total), exit 0npm run featuremap:check— 319 features, no advisories, exit 0git diff --check— exit 0Branch CI run
32036348251passed on exact head0672fca:package,kubernetes-provider-e2e,load-e2e,verification-gate-e2e, andverification-stack-e2eall completed successfully.Rollout gate
Do not re-enable production Factory until this fix is released and installed,
batchSizeremains 1,fleetHealth.requireDedicatedBrokeris true,AGENT_RELAY_STATE_DIRpoints to a Factory-only state directory, and both isolated control paths have been independently verified healthy.Agent Relay still needs a separate underlying fix so a hung registration cannot monopolize the global actor/control loop and health reports control-plane readiness rather than listener liveness.