feat: retry-system - #101
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August 27, 2026 18:13
Adds RETRY_ATTEMPTS (3..=5, default 3) and RETRY_BACKOFF_MS (100..=30000, default 1000) to Settings, validated with the same panic-on-invalid contract as POOLING and CHUNK_SIZE_MB. The combinator logs every failed attempt and any late success through the JobLogger it borrows, so retries reach the server on the existing job-log path with no API change. It borrows rather than clones the Arc so Arc::try_unwrap in the backup executor keeps working. Backoff is exponential with equal jitter, because the uploader retries storages concurrently and would otherwise retry them in lockstep.
Each attempt now dumps into its own tmp_path/attempt-{n} directory,
which is removed when the attempt fails. Without the per-attempt
directory pg_dump -Fd would refuse every retry, because it will not
write into a directory a previous attempt left behind; removing it on
failure keeps peak disk at one attempt's artifacts rather than five.
A backup blocked by a concurrent job is retried before surfacing the
same backup_already_in_progress code, since FileLock reports it as an
ordinary error and the combinator cannot tell it apart.
Reshapes retry()'s bound from the native AsyncFnMut sugar to the
classic F: FnMut(u32) -> Fut, Fut: Future<Output = Result<T, E>> + Send
shape (the pattern tokio-retry and backoff both use). AsyncFnMut's
produced future is a lifetime-quantified associated type
(F::CallRefFuture<'_>) that cannot be named or bounded as Send on
stable Rust, so wiring a retried call through it into a future that
eventually gets polled inside tokio::spawn (dispatcher.rs, via
execute_backup) made rustc's opaque-type Send inference fail with
"implementation of Send is not general enough" at the spawn site,
several call layers away from the actual retry call. Naming Fut as its
own type parameter lets Send be asserted on it directly instead, which
resolves cleanly. The combinator's control flow, log messages, and
formats are unchanged; only the bound and the call sites' closure
shape (async |x| { } becomes |x| async { }, with shared references
bound outside a move closure so the inner async move block only moves
Copy references, not the originals) are affected.
Wraps provider.upload in the retry combinator. No provider changes are needed: each one builds its upload stream from the file on disk inside upload(), so every attempt gets a fresh handle and a fresh nonce. Result<UploadResult, UploadResult> is collapsed with an or-pattern so the last attempt's error and metadata survive into the existing failure branch. A missing backup file short-circuits into Err rather than returning early, which skips the retry without skipping the backup_upload_status(failed) call that closes the server-side record. backup_upload_init and backup_upload_status are left unwrapped; they are control-plane calls, not storage uploads.
Extracts the download body to download_once and makes download_backup a retry wrapper around it. This path had no retry at all before, so a single dropped connection failed the whole restore job. Retrying is safe because File::create truncates and the target filename is derived from Content-Disposition or the URL, so it is stable across attempts. There is no Range resume: a download that fails at 90% starts over.
helm/templates/env-configmap.yaml never listed RETRY_ATTEMPTS and RETRY_BACKOFF_MS even though values.yaml gained them, so --set env.RETRY_ATTEMPTS=N was silently ignored by Kubernetes deployments. Add both keys in the same explicit style as the existing entries. src/utils/retry.rs logged its own "failed after N attempts" error on exhaustion, on top of the terminal log each call site already writes, producing two error entries per failure. Worse, it changed a log level: FileLock::acquire's "backup_already_in_progress" bails through the combinator, which now logged it as error before runner.rs got a chance to reclassify it as the routine warn it always was. A manual backup colliding with a scheduled one would show up as a hard error on the dashboard instead of the harmless warn it used to be, breaking the "fails exactly as it does today" guarantee for job records. Drop the combinator's terminal error log and give download_backup its own terminal error log so all three call sites (runner, uploader, downloader) own their failure logging uniformly. Update the two tests that asserted the removed message to assert the new behavior instead.
📝 WalkthroughWalkthroughThe change adds configurable asynchronous retries for database backups, provider uploads, and backup downloads. It adds retry settings to application configuration and deployment templates, plus tests for backoff, logging, cleanup, and eventual success. ChangesRetry handling
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟠 High · up to This PR adds retries to backup and restore operations, but it also commits a complete encryption key and can repeat uploads after ambiguous failures, potentially exposing or duplicating protected backup data. The changes are not merge-ready until the key is removed and rotated, upload retries are made safe, and the retry configuration edge cases are addressed. Sequence Diagram(s)sequenceDiagram
participant BackupService
participant retry
participant StorageProvider
participant JobLogger
BackupService->>retry: invoke upload with RetryPolicy
retry->>StorageProvider: upload backup file
StorageProvider-->>retry: failed UploadResult
retry->>JobLogger: log retry warning
retry->>StorageProvider: retry upload
StorageProvider-->>retry: successful UploadResult
retry-->>BackupService: return upload result
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 47.83% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 23 functions across 13 files. (3 skipped: 3 unsupported.)
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Inline comments:
In `@docker-compose.yml`:
- Around line 27-28: Uncomment the RETRY_ATTEMPTS and RETRY_BACKOFF_MS entries
in the Compose environment configuration so the container receives the
configured retry values instead of relying on the defaults in src/settings.rs.
- Line 24: Remove the hardcoded master key from the EDGE_KEY environment setting
in the compose configuration, and replace it with a non-committed development
secret sourced through the existing environment-variable mechanism. Rotate the
exposed key if it has been used.
In `@src/services/backup/uploader.rs`:
- Around line 114-133: Update the retry flow around the provider.upload call in
retry so unsuccessful results are not blindly retried when the outcome may be
ambiguous. Add provider-specific idempotency or reconciliation that detects
commit-then-error outcomes and confirms or reuses existing remote upload state
before another write, then add coverage proving a retry does not create
additional resumable or multipart state.
In `@src/utils/retry.rs`:
- Around line 8-12: Ensure RetryPolicy cannot execute when attempts is zero:
either represent attempts with a non-zero type or validate it before the retry
loop, including the existing f(1) call. Add a test covering the chosen
zero-attempt behavior and preserve normal retry behavior for positive attempts.
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📒 Files selected for processing (16)
docker-compose.ymlhelm/templates/env-configmap.yamlhelm/values.yamlsrc/services/backup/models.rssrc/services/backup/runner.rssrc/services/backup/uploader.rssrc/services/restore/downloader.rssrc/settings.rssrc/tests/services/backup_runner_tests.rssrc/tests/services/backup_uploader_tests.rssrc/tests/services/mod.rssrc/tests/services/restore_downloader_tests.rssrc/tests/utils/mod.rssrc/tests/utils/retry_tests.rssrc/utils/mod.rssrc/utils/retry.rs
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Summary by CodeRabbit
New Features
Bug Fixes
Tests