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Follow-up to #8978 for the optional part of #8977. A new retries SSG option retries a failed or timed-out route, or an onStaticGenerate call that throws, up to N times before the build fails. Each wait starts at 500ms and doubles up to 2s, plus up to 30% at random so routes that failed together don't retry together. The build summary and the result count the routes that needed a retry. Defaults to 0. The SSG guide gets a "Failed renders" section.
Also fixes two SSG bugs the review found: a crashed worker stalled the build until the 30s timeout, and routes that render a 5xx error page (e.g. a loader throwing requestEvent.error(503)) were skipped silently instead of failing the build.
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Walkthrough
SSG workers now report 5xx responses and announce generated files. The worker pool removes output from failed renders and replaces exited workers. The orchestrator retries failed or timed-out routes, with exponential delays and worker restarts after timeouts.
Workers report 5xx route errors and announce output files. The pool tracks files by route, removes files for failed renders, replaces exited workers, and excludes errored renders from the sitemap. Tests cover worker startup, crashes, restarts, and file cleanup.
SsgRenderOptions adds retries, defaulting to 0. The orchestrator retries failed renders with delays starting at 500 ms and doubling up to 2 seconds. It restarts a worker before retrying a timed-out route and logs retry warnings.
Document SSG failure and retry behavior packages/docs/src/routes/api/qwik-router-ssg/*, packages/docs/src/routes/docs/(qwikrouter)/guides/static-site-generation/index.mdx, .changeset/*
The API reference and guide describe render failures, skipped routes, and retry behavior. Changesets record the worker, 5xx route, and retry changes.
sequenceDiagram
participant mainThread
participant workerPool
participant workerThread
mainThread->>workerPool: Request route render
workerPool->>workerThread: Run route render
workerThread-->>workerPool: Return result and announce generated files
workerPool-->>mainThread: Return render result
mainThread->>workerPool: Restart route worker after timeout
mainThread->>mainThread: Schedule retry with exponential delay
Loading
Possibly related issues
QwikDev/qwik#8928 — The issue describes SSG render tasks that stall the worker pool. This change adds timeout handling, worker recovery, retries, and failure reporting.
Suggested reviewers:wmertens
Merge Risk: Low · previous review ac833
The change is mergeable with a documentation follow-up: clarify that a route returning 429 will not be retried. The custom 404 page behavior is already described correctly.
Security architecture risk: Moderate · up to ac833
The recovery flow introduces deletion of route-derived paths without verifying that they remain inside the output directory or were successfully created. Cleanup failures also do not prevent recovery. Exposure depends on generated route inputs and build-process permissions; a remotely exploitable path has not been established.
Retained concerns
Medium · security · inferred: New cleanup trusts announced route-derived paths without checking containment or whether the attempt created the file. Generated parameters are substituted without escaping, while filesystem derivation decodes encoded separators before joining with outDir. If an included route accepts such parameters, cleanup can target pre-existing files outside the output directory. Path escape and write authority predate this PR, but unlinking after a failed open introduces additional destructive authority. External attacker control and an end-to-end render of this path are not established.
Low · reliability · inferred: Recovery waits for deletion attempts to settle but discards deletion failures. With retries enabled, a failed render can subsequently become a skipped 4xx response without recording a terminal error, potentially leaving failed HTML or loader output in an otherwise successful build. Successful-removal ordering is covered by tests, but it does not establish containment when removal fails. The base did not have this retry-to-success transition.
Security review details
Security Blast Radius
inferred — The conditional deletion exposure is bounded by files removable by the build process, not necessarily by outDir. Parent-directory permissions can allow unlinking a file even when opening that file for writing is denied. Production filesystem permissions and isolation between builds were not supplied.
Security Findings and Attack Paths
inferred — A conditional path runs from externally influenced onStaticGenerate parameters, through unescaped substitution and later pathname decoding, to an escaped output path announced for cleanup. For example, an encoded parent traversal ending in protected.html can derive a sibling file outside outDir. New deletion after an error or worker exit broadens the pre-existing write exposure. No production external-data consumer or complete matching-and-rendering exploit was verified.
Trust Boundaries and Controls
observed — The specifically routed FakeWorker entrypoint is a test-local class installed through a worker_threads mock, not a production network entrypoint. Production cleanup instead receives messages from the configured rendering worker.
Resilience and Maintainability Implications
inferred — Discarding removal failures weakens the recovery guarantee that failed output cannot survive a successful build. This matters particularly when a retry returns a skipped response and therefore does not overwrite the earlier files.
Hardening Proposals
proposed — Enforce output-root containment before creation and deletion, and associate cleanup with files owned by the specific attempt rather than every announced target. Treat unsuccessful cleanup as a terminal recovery failure unless output isolation provides an equivalent containment guarantee.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
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Docstring coverage is 7.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 14 functions across 10 files.
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
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Title check
The title clearly and concisely identifies the primary change: adding the SSG retries option. It is directly related to the pull request objectives and changes.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @packages/qwik-router/src/ssg/worker-pool.ts:
- Around line 230-234: Update the worker-pool configuration so maxTasksPerWorker
is capped at 1 whenever retries are enabled, while preserving the existing task
limit when retries are disabled; this prevents restartWorker from terminating
unrelated renders on the same worker.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at
@packages/docs/src/routes/docs/(qwikrouter)/guides/static-site-generation/index.mdx:
- Line 136: Update the SSG skipped-route statement to clarify that ordinary
routes responding with a 4xx status are skipped, but `/404.html` is an
exception: SSG writes the generated not-found page even when it responds with
404.
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Inline comments:
Review comments at
@packages/docs/src/routes/docs/(qwikrouter)/guides/static-site-generation/index.mdx:
- Line 140: Clarify the static site generation guide’s `retries` example to
state that it applies when rate-limiting causes a render error; a route that
responds with 429 follows the existing 4xx skip rule and is not retried.
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A crashed worker stayed in rotation, so the next routes sent to it hung until the 30s render timeout. A worker that dies before it is ready would die again, so it is not replaced; the build stops with its startup error instead.
Build-time data sources can fail for a moment. A failed route, or an `onStaticGenerate` call that throws, is now retried up to `retries` times, waiting 500ms (doubling up to 2s, plus up to 30% at random so failed routes don't retry in lockstep) between attempts, and the build summary counts the routes that needed a retry. A failed attempt's files are removed, so a retry that ends as a skip cannot ship the failed HTML.
A hung render held its worker slot, so a timeout stopped the whole build. With retries left, the worker is restarted first and the route is retried on a fresh one; the other renders it stopped start again without using a retry. With none left, the build stops as before.
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What is it?
Description
Follow-up to #8978 for the optional part of #8977. A new
retriesSSG option retries a failed or timed-out route, or anonStaticGeneratecall that throws, up to N times before the build fails. Each wait starts at 500ms and doubles up to 2s, plus up to 30% at random so routes that failed together don't retry together. The build summary and the result count the routes that needed a retry. Defaults to0. The SSG guide gets a "Failed renders" section.Also fixes two SSG bugs the review found: a crashed worker stalled the build until the 30s timeout, and routes that render a 5xx error page (e.g. a loader throwing
requestEvent.error(503)) were skipped silently instead of failing the build.