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Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
108 lines
5.2 KiB
Markdown
108 lines
5.2 KiB
Markdown
# Implementation Plan: p3-17-media-processing-s3
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**Branch**: `[p3-17-media-processing-s3]` | **Date**: 2026-02-04 | **Spec**: `docs/todo_list.md#17`
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**Input**: P3-17 “媒体处理管线适配对象存储（S3/MinIO）” + user request to extract a cover from `fixtures/demo.mp4` via ffmpeg.
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## Summary
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Adapt the media processing worker to support S3/MinIO storage by downloading source media to a temp directory, running ffmpeg to generate a cover image, uploading derived assets via the storage provider, and preserving the existing local filesystem path. Include fixture-based verification using `fixtures/demo.mp4`.
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## Technical Context
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**Language/Version**: Go 1.x (project standard)
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**Primary Dependencies**: River (jobs), MinIO SDK (S3 compatible), Fiber
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**Storage**: PostgreSQL + local filesystem / S3-compatible storage
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**Testing**: `go test` (service/job tests), ffmpeg CLI for fixture validation
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**Target Platform**: Linux server
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**Project Type**: Web application (backend + frontend, backend-only changes)
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**Performance Goals**: N/A (processing path only)
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**Constraints**: Preserve local storage behavior; do not edit generated files; follow `backend/llm.txt`; ensure temp files are cleaned
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**Scale/Scope**: Media processing worker + storage provider only
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## Constitution Check
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- Follow `backend/llm.txt` conventions and Chinese comments for business logic.
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- Do not edit generated files (`*.gen.go`, `backend/docs/docs.go`).
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- Keep controller thin; changes limited to jobs/services/providers.
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- Preserve local provider behavior; add S3 path without regression.
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## Project Structure
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### Documentation (this feature)
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```text
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docs/
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└── plan.md # This plan
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```
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### Source Code (repository root)
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```text
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backend/
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├── app/
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│ ├── jobs/
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│ │ ├── media_process_job.go
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│ │ └── args/media_asset_process.go
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│ └── services/
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│ └── common.go
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└── providers/
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└── storage/provider.go
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fixtures/
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└── demo.mp4
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```
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**Structure Decision**: Web application backend; scope limited to media processing worker and storage provider integration.
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## Plan Phases
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1. **Design & plumbing**: Define temp file conventions and storage download API for S3/local.
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2. **Implementation**: Add S3 processing flow to worker and cover asset registration; keep local path intact.
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3. **Verification**: Add tests (or integration checks) and run fixture-based ffmpeg validation.
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## Tasks
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1. **Define storage download interface**
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- Add a storage provider helper to download an object to a local temp file (local: copy from `LocalPath/objectKey` without rename; S3: `FGetObject`).
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- Ensure helper never mutates/deletes the source object, creates parent dirs for destination, and overwrites the destination if it already exists.
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- Ensure API is used by jobs without leaking provider-specific logic.
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2. **Adapt `MediaProcessWorker` for S3/MinIO**
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- For non-local providers, download the source object into a temp directory.
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- Run ffmpeg to extract a cover image from the temp file.
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- Upload the cover via `storage.PutObject` and register the derived media asset.
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- Ensure temp directories/files are cleaned on success or failure.
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3. **Update cover asset registration**
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- For non-local providers, avoid filesystem rename; upload via storage provider and keep object key conventions.
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- Use `storage.PutObject(ctx, objectKey, coverTempPath, "image/jpeg")`, then cleanup temp files/dirs.
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- Keep local path move behavior unchanged.
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4. **Add tests / verification hooks**
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- Add a job/service test for S3 path (gated by MinIO env if needed).
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- Keep/extend local path test to ensure no regression.
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- Validate `fixtures/demo.mp4` can produce a cover with ffmpeg.
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## Dependencies
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- Task 1 must complete before Task 2 (worker needs download API).
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- Task 2 must complete before Task 3 (cover registration requires new flow).
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- Task 4 depends on Task 2 & 3 (tests rely on updated pipeline).
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## Acceptance Criteria
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- **Local path unchanged**: `MediaProcessWorker` still generates a cover image for local provider when ffmpeg is available.
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- **S3/MinIO path works**: For `Storage.Type = s3`, the worker downloads source media, generates cover via ffmpeg, uploads cover to bucket, and creates a derived `media_assets` record with correct object key.
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- **Fixture validation**: `ffmpeg -y -i fixtures/demo.mp4 -ss 00:00:00.000 -vframes 1 /tmp/demo_cover.jpg` succeeds locally and produces a non-empty file.
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- **S3/MinIO test config**: tests load Storage config with `Type=s3`, `Endpoint`, `AccessKey`, `SecretKey`, `Bucket`, `PathStyle` (true for MinIO).
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- **Automated checks** (to be added in this phase):
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- `go test ./backend/app/jobs -run TestMediaProcessWorkerS3 -count=1` passes (with S3/MinIO config loaded).
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- `go test ./backend/app/jobs -run TestMediaProcessWorkerLocal -count=1` passes.
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## Risks
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- **ffmpeg not installed**: Worker should detect and log; processing should fail gracefully.
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- **Temp storage pressure**: Large media downloads may exceed disk; ensure cleanup on all paths.
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- **S3 connectivity/transient errors**: Add retry or error propagation to avoid silent failures.
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- **Access policies**: Misconfigured bucket policies may prevent download/upload; surface clear errors.
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