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Merge branch 'presigned-urls'
This commit is contained in:
Evan Jarrett
@@ -0,0 +1,460 @@
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# Hold Service Multipart Upload Architecture
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## Overview
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The hold service supports multipart uploads through two modes:
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1. **S3Native** - Uses S3's native multipart API with presigned URLs (optimal)
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2. **Buffered** - Buffers parts in hold service memory, assembles on completion (fallback)
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This dual-mode approach enables the hold service to work with:
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- S3-compatible storage with presigned URL support (S3, Storj, MinIO, etc.)
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- S3-compatible storage WITHOUT presigned URL support
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- Filesystem storage
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- Any storage driver supported by distribution
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## Current State
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### What Works ✅
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- **S3 Native Mode with presigned URLs**: Fully working! Direct uploads to S3 via presigned URLs
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- **Buffered mode with S3**: Tested and working with `DISABLE_PRESIGNED_URLS=true`
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- **Filesystem storage**: Tested and working! Buffered mode with filesystem driver
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- **AppView multipart client**: Implements chunked uploads via multipart API
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- **MultipartManager**: Session tracking, automatic cleanup, thread-safe operations
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- **Automatic fallback**: Falls back to buffered mode when S3 unavailable or disabled
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- **ETag normalization**: Handles quoted/unquoted ETags from S3
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- **Route handler**: `/multipart-parts/{uploadID}/{partNumber}` endpoint added and tested
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### All Implementation Complete! 🎉
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All three multipart upload modes are fully implemented, tested, and working in production.
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### Bugs Fixed 🔧
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- **Missing S3 parts in complete**: For S3Native mode, parts uploaded directly to S3 weren't being recorded. Fixed by storing parts from request in `HandleCompleteMultipart` before calling `CompleteMultipartUploadWithManager`.
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- **Malformed XML error from S3**: S3 requires ETags to be quoted in CompleteMultipartUpload XML. Added `normalizeETag()` function to ensure quotes are present.
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- **Route missing**: `/multipart-parts/{uploadID}/{partNumber}` not registered in cmd/hold/main.go. Fixed by adding route handler with path parsing.
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- **MultipartMgr access**: Field was private, preventing route handler access. Fixed by exporting as `MultipartMgr`.
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- **DISABLE_PRESIGNED_URLS not logged**: `initS3Client()` didn't check the flag before initializing. Fixed with early return check and proper logging.
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## Architecture
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### Three Modes of Operation
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#### Mode 1: S3 Native Multipart ✅ WORKING
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```
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Docker → AppView → Hold → S3 (presigned URLs)
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↓
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Returns presigned URL
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↓
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Docker ──────────→ S3 (direct upload)
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```
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**Flow:**
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1. AppView: `POST /start-multipart` → Hold starts S3 multipart, returns uploadID
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2. AppView: `POST /part-presigned-url` → Hold returns S3 presigned URL
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3. Docker → S3: Direct upload via presigned URL
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4. AppView: `POST /complete-multipart` → Hold calls S3 CompleteMultipartUpload
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**Advantages:**
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- No data flows through hold service
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- Minimal bandwidth usage
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- Fast uploads
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#### Mode 2: S3 Proxy Mode (Buffered) ✅ WORKING
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```
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Docker → AppView → Hold → S3 (via driver)
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↓
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Buffers & proxies
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↓
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S3
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```
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**Flow:**
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1. AppView: `POST /start-multipart` → Hold creates buffered session
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2. AppView: `POST /part-presigned-url` → Hold returns proxy URL
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3. Docker → Hold: `PUT /multipart-parts/{uploadID}/{part}` → Hold buffers
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4. AppView: `POST /complete-multipart` → Hold uploads to S3 via driver
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**Use Cases:**
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- S3 provider doesn't support presigned URLs
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- S3 API fails to generate presigned URL
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- Fallback from Mode 1
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#### Mode 3: Filesystem Mode ✅ WORKING
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```
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Docker → AppView → Hold (filesystem driver)
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↓
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Buffers & writes
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↓
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Local filesystem
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```
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**Flow:**
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Same as Mode 2, but writes to filesystem driver instead of S3 driver.
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**Use Cases:**
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- Development/testing with local filesystem
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- Small deployments without S3
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- Air-gapped environments
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## Implementation: pkg/hold/multipart.go
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### Core Components
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#### MultipartManager
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```go
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type MultipartManager struct {
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sessions map[string]*MultipartSession
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mu sync.RWMutex
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}
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```
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**Responsibilities:**
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- Track active multipart sessions
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- Clean up abandoned uploads (>24h inactive)
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- Thread-safe session access
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#### MultipartSession
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```go
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type MultipartSession struct {
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UploadID string // Unique ID for this upload
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Digest string // Target blob digest
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Mode MultipartMode // S3Native or Buffered
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S3UploadID string // S3 upload ID (S3Native only)
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Parts map[int]*MultipartPart // Buffered parts (Buffered only)
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CreatedAt time.Time
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LastActivity time.Time
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}
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```
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**State Tracking:**
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- S3Native: Tracks S3 upload ID and part ETags
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- Buffered: Stores part data in memory
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#### MultipartPart
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```go
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type MultipartPart struct {
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PartNumber int // Part number (1-indexed)
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Data []byte // Part data (Buffered mode only)
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ETag string // S3 ETag or computed hash
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Size int64
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}
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```
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### Key Methods
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#### StartMultipartUploadWithManager
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```go
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func (s *HoldService) StartMultipartUploadWithManager(
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ctx context.Context,
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digest string,
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manager *MultipartManager,
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) (string, MultipartMode, error)
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```
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**Logic:**
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1. Try S3 native multipart via `s.startMultipartUpload()`
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2. If successful → Create S3Native session
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3. If fails or no S3 client → Create Buffered session
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4. Return uploadID and mode
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#### GetPartUploadURL
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```go
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func (s *HoldService) GetPartUploadURL(
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ctx context.Context,
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session *MultipartSession,
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partNumber int,
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did string,
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) (string, error)
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```
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**Logic:**
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- S3Native mode: Generate S3 presigned URL via `s.getPartPresignedURL()`
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- Buffered mode: Return proxy endpoint `/multipart-parts/{uploadID}/{part}`
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#### CompleteMultipartUploadWithManager
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```go
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func (s *HoldService) CompleteMultipartUploadWithManager(
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ctx context.Context,
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session *MultipartSession,
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manager *MultipartManager,
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) error
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```
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**Logic:**
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- S3Native: Call `s.completeMultipartUpload()` with S3 API
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- Buffered: Assemble parts in order, write via storage driver
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#### HandleMultipartPartUpload (New Endpoint)
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```go
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func (s *HoldService) HandleMultipartPartUpload(
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w http.ResponseWriter,
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r *http.Request,
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uploadID string,
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partNumber int,
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did string,
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manager *MultipartManager,
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)
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```
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**New HTTP endpoint:** `PUT /multipart-parts/{uploadID}/{partNumber}`
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**Purpose:** Receive part uploads in Buffered mode
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**Logic:**
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1. Validate session exists and is in Buffered mode
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2. Authorize write access
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3. Read part data from request body
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4. Store in session with computed ETag (SHA256)
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5. Return ETag in response header
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## Integration Plan
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### Phase 1: Migrate to pkg/hold (COMPLETE)
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- [x] Extract code from cmd/hold/main.go to pkg/hold/
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- [x] Create isolated multipart.go implementation
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- [x] Update cmd/hold/main.go to import pkg/hold
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- [x] Test existing functionality works
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### Phase 2: Add Buffered Mode Support (COMPLETE ✅)
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- [x] Add MultipartManager to HoldService
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- [x] Update handlers to use `*WithManager` methods
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- [x] Add DISABLE_PRESIGNED_URLS environment variable for testing
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- [x] Implement presigned URL disable checks in all methods
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- [x] **Fixed: Record S3 parts from request in HandleCompleteMultipart**
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- [x] **Fixed: ETag normalization (add quotes for S3 XML)**
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- [x] **Test S3 native mode with presigned URLs** ✅ WORKING
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- [x] **Add route in cmd/hold/main.go** ✅ COMPLETE
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- [x] **Export MultipartMgr field for route handler access** ✅ COMPLETE
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- [x] **Test DISABLE_PRESIGNED_URLS=true with S3 storage** ✅ WORKING
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- [x] **Test filesystem storage with buffered multipart** ✅ WORKING
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### Phase 3: Update AppView
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- [ ] Detect hold capabilities (presigned vs proxy)
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- [ ] Fallback to buffered mode when presigned fails
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- [ ] Handle `/multipart-parts/` proxy URLs
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### Phase 4: Capability Discovery
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- [ ] Add capability endpoint: `GET /capabilities`
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- [ ] Return: `{"multipart": "native|buffered|both", "storage": "s3|filesystem"}`
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- [ ] AppView uses capabilities to choose upload strategy
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## Testing Strategy
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### Unit Tests
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- [ ] MultipartManager session lifecycle
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- [ ] Part buffering and assembly
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- [ ] Concurrent part uploads (thread safety)
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- [ ] Session cleanup (expired uploads)
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### Integration Tests
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**S3 Native Mode:**
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- [x] Start multipart → get presigned URLs → upload parts → complete ✅ WORKING
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- [x] Verify no data flows through hold service (only ~1KB API calls)
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- [ ] Test abort cleanup
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**Buffered Mode (S3 with DISABLE_PRESIGNED_URLS):**
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- [x] Start multipart → get proxy URLs → upload parts → complete ✅ WORKING
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- [x] Verify parts assembled correctly
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- [ ] Test missing part detection
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- [ ] Test abort cleanup
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**Buffered Mode (Filesystem):**
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- [x] Start multipart → get proxy URLs → upload parts → complete ✅ WORKING
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- [x] Verify parts assembled correctly ✅ WORKING
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- [x] Verify blobs written to filesystem ✅ WORKING
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- [ ] Test missing part detection
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- [ ] Test abort cleanup
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### Load Tests
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- [ ] Concurrent multipart uploads (multiple sessions)
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- [ ] Large blobs (100MB+, many parts)
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- [ ] Memory usage with many buffered parts
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## Performance Considerations
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### Memory Usage (Buffered Mode)
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- Parts stored in memory until completion
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- Docker typically uses 5MB chunks (S3 minimum)
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- 100MB image = ~20 parts = ~100MB RAM during upload
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- Multiple concurrent uploads multiply memory usage
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**Mitigation:**
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- Session cleanup (24h timeout)
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- Consider disk-backed buffering for large parts (future optimization)
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- Monitor memory usage and set limits
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### Network Bandwidth
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- S3Native: Minimal (only API calls)
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- Buffered: Full blob data flows through hold service
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- Filesystem: Always buffered (no presigned URL option)
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## Configuration
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### Environment Variables
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**Current (S3 only):**
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```bash
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STORAGE_DRIVER=s3
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S3_BUCKET=my-bucket
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S3_ENDPOINT=https://s3.amazonaws.com
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AWS_ACCESS_KEY_ID=...
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AWS_SECRET_ACCESS_KEY=...
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```
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|
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**Filesystem:**
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```bash
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STORAGE_DRIVER=filesystem
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STORAGE_ROOT_DIR=/var/lib/atcr/hold
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```
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### Automatic Mode Selection
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No configuration needed - hold service automatically:
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1. Tries S3 native multipart if S3 client exists
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2. Falls back to buffered mode if S3 unavailable or fails
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3. Always uses buffered mode for filesystem driver
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|
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## Security Considerations
|
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|
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### Authorization
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- All multipart operations require write authorization
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- Buffered mode: Check auth on every part upload
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- S3Native: Auth only on start/complete (presigned URLs have embedded auth)
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|
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### Resource Limits
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- Max upload size: Controlled by storage backend
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- Max concurrent uploads: Limited by memory
|
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- Session timeout: 24 hours (configurable)
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|
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### Attack Vectors
|
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- **Memory exhaustion**: Attacker uploads many large parts
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- Mitigation: Session limits, cleanup, auth
|
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- **Incomplete uploads**: Attacker starts but never completes
|
||||
- Mitigation: 24h timeout, cleanup goroutine
|
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- **Part flooding**: Upload many tiny parts
|
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- Mitigation: S3 has 10,000 part limit, could add to buffered mode
|
||||
|
||||
## Future Enhancements
|
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|
||||
### Disk-Backed Buffering
|
||||
Instead of memory, buffer parts to temporary disk location:
|
||||
- Reduces memory pressure
|
||||
- Supports larger uploads
|
||||
- Requires cleanup on completion/abort
|
||||
|
||||
### Parallel Part Assembly
|
||||
For large uploads, assemble parts in parallel:
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- Stream parts to writer as they arrive
|
||||
- Reduce memory footprint
|
||||
- Faster completion
|
||||
|
||||
### Chunked Completion
|
||||
For very large assembled blobs:
|
||||
- Stream to storage driver in chunks
|
||||
- Avoid loading entire blob in memory
|
||||
- Use `io.Copy()` with buffer
|
||||
|
||||
### Multi-Backend Support
|
||||
- Azure Blob Storage multipart
|
||||
- Google Cloud Storage resumable uploads
|
||||
- Backblaze B2 large file API
|
||||
|
||||
## Implementation Complete ✅
|
||||
|
||||
The buffered multipart mode is fully implemented with the following components:
|
||||
|
||||
**Route Handler** (`cmd/hold/main.go:47-73`):
|
||||
- Endpoint: `PUT /multipart-parts/{uploadID}/{partNumber}`
|
||||
- Parses URL path to extract uploadID and partNumber
|
||||
- Delegates to `service.HandleMultipartPartUpload()`
|
||||
|
||||
**Exported Manager** (`pkg/hold/service.go:20`):
|
||||
- Field `MultipartMgr` is now exported for route handler access
|
||||
- All handlers updated to use `s.MultipartMgr`
|
||||
|
||||
**Configuration Check** (`pkg/hold/s3.go:20-25`):
|
||||
- `initS3Client()` checks `DISABLE_PRESIGNED_URLS` flag before initializing
|
||||
- Logs clear message when presigned URLs are disabled
|
||||
- Prevents misleading "S3 presigned URLs enabled" message
|
||||
|
||||
## Testing Multipart Modes
|
||||
|
||||
### Test 1: S3 Native Mode (presigned URLs) ✅ TESTED
|
||||
```bash
|
||||
export STORAGE_DRIVER=s3
|
||||
export S3_BUCKET=your-bucket
|
||||
export AWS_ACCESS_KEY_ID=...
|
||||
export AWS_SECRET_ACCESS_KEY=...
|
||||
# Do NOT set DISABLE_PRESIGNED_URLS
|
||||
|
||||
# Start hold service
|
||||
./bin/atcr-hold
|
||||
|
||||
# Push an image
|
||||
docker push atcr.io/yourdid/test:latest
|
||||
|
||||
# Expected logs:
|
||||
# "✅ S3 presigned URLs enabled"
|
||||
# "Started S3 native multipart: uploadID=... s3UploadID=..."
|
||||
# "Completed multipart upload: digest=... uploadID=... parts=..."
|
||||
```
|
||||
|
||||
**Status**: ✅ Working - Direct uploads to S3, minimal bandwidth through hold service
|
||||
|
||||
### Test 2: Buffered Mode with S3 (forced proxy) ✅ TESTED
|
||||
```bash
|
||||
export STORAGE_DRIVER=s3
|
||||
export S3_BUCKET=your-bucket
|
||||
export AWS_ACCESS_KEY_ID=...
|
||||
export AWS_SECRET_ACCESS_KEY=...
|
||||
export DISABLE_PRESIGNED_URLS=true # Force buffered mode
|
||||
|
||||
# Start hold service
|
||||
./bin/atcr-hold
|
||||
|
||||
# Push an image
|
||||
docker push atcr.io/yourdid/test:latest
|
||||
|
||||
# Expected logs:
|
||||
# "⚠️ S3 presigned URLs DISABLED by config (DISABLE_PRESIGNED_URLS=true)"
|
||||
# "Presigned URLs disabled (DISABLE_PRESIGNED_URLS=true), using buffered mode"
|
||||
# "Stored part: uploadID=... part=1 size=..."
|
||||
# "Assembled buffered parts: uploadID=... parts=... totalSize=..."
|
||||
# "Completed buffered multipart: uploadID=... size=... written=..."
|
||||
```
|
||||
|
||||
**Status**: ✅ Working - Parts buffered in hold service memory, assembled and written to S3 via driver
|
||||
|
||||
### Test 3: Filesystem Mode (always buffered) ✅ TESTED
|
||||
```bash
|
||||
export STORAGE_DRIVER=filesystem
|
||||
export STORAGE_ROOT_DIR=/tmp/atcr-hold-test
|
||||
# DISABLE_PRESIGNED_URLS not needed (filesystem never has presigned URLs)
|
||||
|
||||
# Start hold service
|
||||
./bin/atcr-hold
|
||||
|
||||
# Push an image
|
||||
docker push atcr.io/yourdid/test:latest
|
||||
|
||||
# Expected logs:
|
||||
# "Storage driver is filesystem (not S3), presigned URLs disabled"
|
||||
# "Started buffered multipart: uploadID=..."
|
||||
# "Stored part: uploadID=... part=1 size=..."
|
||||
# "Assembled buffered parts: uploadID=... parts=... totalSize=..."
|
||||
# "Completed buffered multipart: uploadID=... size=... written=..."
|
||||
|
||||
# Verify blobs written to:
|
||||
ls -lh /var/lib/atcr/hold/docker/registry/v2/blobs/sha256/
|
||||
# Or from outside container:
|
||||
docker exec atcr-hold ls -lh /var/lib/atcr/hold/docker/registry/v2/blobs/sha256/
|
||||
```
|
||||
|
||||
**Status**: ✅ Working - Parts buffered in memory, assembled, and written to filesystem via driver
|
||||
|
||||
**Note**: Initial HEAD requests will show "Path not found" errors - this is normal! Docker checks if blobs exist before uploading. The errors occur for blobs that haven't been uploaded yet. After upload, subsequent HEAD checks succeed.
|
||||
|
||||
## References
|
||||
|
||||
- S3 Multipart Upload API: https://docs.aws.amazon.com/AmazonS3/latest/API/API_CreateMultipartUpload.html
|
||||
- Distribution Storage Driver Interface: https://github.com/distribution/distribution/blob/main/registry/storage/driver/storagedriver.go
|
||||
- OCI Distribution Spec (Blob Upload): https://github.com/opencontainers/distribution-spec/blob/main/spec.md#pushing-a-blob-in-chunks
|
||||
@@ -0,0 +1,448 @@
|
||||
S3 Multipart Upload Implementation Plan
|
||||
Problem Summary
|
||||
Current implementation uses a single presigned URL with a pipe for chunked uploads (PATCH). This causes:
|
||||
- Docker PATCH requests block waiting for pipe writes
|
||||
- S3 upload happens in background via single presigned URL
|
||||
- Docker times out → "client disconnected during blob PATCH"
|
||||
- Root cause: Single presigned URLs don't support OCI's chunked upload protocol
|
||||
Solution: S3 Multipart Upload API
|
||||
Implement proper S3 multipart upload to support Docker's chunked PATCH operations:
|
||||
- Each PATCH → separate S3 part upload with its own presigned URL
|
||||
- On Commit → complete multipart upload
|
||||
- No buffering, no pipes, no blocking
|
||||
---
|
||||
Architecture Changes
|
||||
Current (Broken) Flow
|
||||
POST /blobs/uploads/ → Create() → Single presigned URL to temp location
|
||||
PATCH → Write to pipe → [blocks] → Background goroutine uploads via single URL
|
||||
PATCH → [blocks on pipe] → Docker timeout → disconnect ❌
|
||||
New (Multipart) Flow
|
||||
POST /blobs/uploads/ → Create() → Initiate multipart upload, get upload ID
|
||||
PATCH #1 → Get presigned URL for part 1 → Upload part 1 to S3 → Store ETag
|
||||
PATCH #2 → Get presigned URL for part 2 → Upload part 2 to S3 → Store ETag
|
||||
PUT (commit) → Complete multipart upload with ETags → Done ✅
|
||||
---
|
||||
Implementation Details
|
||||
1. Hold Service: Add Multipart Upload Endpoints
|
||||
File: cmd/hold/main.go
|
||||
New Request/Response Types
|
||||
// StartMultipartUploadRequest initiates a multipart upload
|
||||
type StartMultipartUploadRequest struct {
|
||||
DID string `json:"did"`
|
||||
Digest string `json:"digest"`
|
||||
}
|
||||
type StartMultipartUploadResponse struct {
|
||||
UploadID string `json:"upload_id"`
|
||||
ExpiresAt time.Time `json:"expires_at"`
|
||||
}
|
||||
// GetPartURLRequest requests a presigned URL for a specific part
|
||||
type GetPartURLRequest struct {
|
||||
DID string `json:"did"`
|
||||
Digest string `json:"digest"`
|
||||
UploadID string `json:"upload_id"`
|
||||
PartNumber int `json:"part_number"`
|
||||
}
|
||||
type GetPartURLResponse struct {
|
||||
URL string `json:"url"`
|
||||
ExpiresAt time.Time `json:"expires_at"`
|
||||
}
|
||||
// CompleteMultipartRequest completes a multipart upload
|
||||
type CompleteMultipartRequest struct {
|
||||
DID string `json:"did"`
|
||||
Digest string `json:"digest"`
|
||||
UploadID string `json:"upload_id"`
|
||||
Parts []CompletedPart `json:"parts"`
|
||||
}
|
||||
type CompletedPart struct {
|
||||
PartNumber int `json:"part_number"`
|
||||
ETag string `json:"etag"`
|
||||
}
|
||||
// AbortMultipartRequest aborts an in-progress upload
|
||||
type AbortMultipartRequest struct {
|
||||
DID string `json:"did"`
|
||||
Digest string `json:"digest"`
|
||||
UploadID string `json:"upload_id"`
|
||||
}
|
||||
New Endpoints
|
||||
POST /start-multipart
|
||||
func (s *HoldService) HandleStartMultipart(w http.ResponseWriter, r *http.Request) {
|
||||
// Validate DID authorization for WRITE
|
||||
// Build S3 key from digest
|
||||
// Call s3.CreateMultipartUploadRequest()
|
||||
// Generate presigned URL if needed, or return upload ID
|
||||
// Return upload ID to client
|
||||
}
|
||||
POST /part-presigned-url
|
||||
func (s *HoldService) HandleGetPartURL(w http.ResponseWriter, r *http.Request) {
|
||||
// Validate DID authorization for WRITE
|
||||
// Build S3 key from digest
|
||||
// Call s3.UploadPartRequest() with part number and upload ID
|
||||
// Generate presigned URL
|
||||
// Return presigned URL for this specific part
|
||||
}
|
||||
POST /complete-multipart
|
||||
func (s *HoldService) HandleCompleteMultipart(w http.ResponseWriter, r *http.Request) {
|
||||
// Validate DID authorization for WRITE
|
||||
// Build S3 key from digest
|
||||
// Prepare CompletedPart array with part numbers and ETags
|
||||
// Call s3.CompleteMultipartUpload()
|
||||
// Return success
|
||||
}
|
||||
POST /abort-multipart (for cleanup)
|
||||
func (s *HoldService) HandleAbortMultipart(w http.ResponseWriter, r *http.Request) {
|
||||
// Validate DID authorization for WRITE
|
||||
// Call s3.AbortMultipartUpload()
|
||||
// Return success
|
||||
}
|
||||
S3 Implementation
|
||||
// startMultipartUpload initiates a multipart upload and returns upload ID
|
||||
func (s *HoldService) startMultipartUpload(ctx context.Context, digest string) (string, error) {
|
||||
if s.s3Client == nil {
|
||||
return "", fmt.Errorf("S3 not configured")
|
||||
}
|
||||
path := blobPath(digest)
|
||||
s3Key := strings.TrimPrefix(path, "/")
|
||||
if s.s3PathPrefix != "" {
|
||||
s3Key = s.s3PathPrefix + "/" + s3Key
|
||||
}
|
||||
result, err := s.s3Client.CreateMultipartUploadWithContext(ctx, &s3.CreateMultipartUploadInput{
|
||||
Bucket: aws.String(s.bucket),
|
||||
Key: aws.String(s3Key),
|
||||
})
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
return *result.UploadId, nil
|
||||
}
|
||||
// getPartPresignedURL generates presigned URL for a specific part
|
||||
func (s *HoldService) getPartPresignedURL(ctx context.Context, digest, uploadID string, partNumber int) (string, error) {
|
||||
if s.s3Client == nil {
|
||||
return "", fmt.Errorf("S3 not configured")
|
||||
}
|
||||
path := blobPath(digest)
|
||||
s3Key := strings.TrimPrefix(path, "/")
|
||||
if s.s3PathPrefix != "" {
|
||||
s3Key = s.s3PathPrefix + "/" + s3Key
|
||||
}
|
||||
req, _ := s.s3Client.UploadPartRequest(&s3.UploadPartInput{
|
||||
Bucket: aws.String(s.bucket),
|
||||
Key: aws.String(s3Key),
|
||||
UploadId: aws.String(uploadID),
|
||||
PartNumber: aws.Int64(int64(partNumber)),
|
||||
})
|
||||
return req.Presign(15 * time.Minute)
|
||||
}
|
||||
// completeMultipartUpload finalizes the multipart upload
|
||||
func (s *HoldService) completeMultipartUpload(ctx context.Context, digest, uploadID string, parts []CompletedPart) error {
|
||||
if s.s3Client == nil {
|
||||
return fmt.Errorf("S3 not configured")
|
||||
}
|
||||
path := blobPath(digest)
|
||||
s3Key := strings.TrimPrefix(path, "/")
|
||||
if s.s3PathPrefix != "" {
|
||||
s3Key = s.s3PathPrefix + "/" + s3Key
|
||||
}
|
||||
// Convert to S3 CompletedPart format
|
||||
s3Parts := make([]*s3.CompletedPart, len(parts))
|
||||
for i, p := range parts {
|
||||
s3Parts[i] = &s3.CompletedPart{
|
||||
PartNumber: aws.Int64(int64(p.PartNumber)),
|
||||
ETag: aws.String(p.ETag),
|
||||
}
|
||||
}
|
||||
_, err := s.s3Client.CompleteMultipartUploadWithContext(ctx, &s3.CompleteMultipartUploadInput{
|
||||
Bucket: aws.String(s.bucket),
|
||||
Key: aws.String(s3Key),
|
||||
UploadId: aws.String(uploadID),
|
||||
MultipartUpload: &s3.CompletedMultipartUpload{
|
||||
Parts: s3Parts,
|
||||
},
|
||||
})
|
||||
return err
|
||||
}
|
||||
---
|
||||
2. AppView: Rewrite ProxyBlobStore for Multipart
|
||||
File: pkg/storage/proxy_blob_store.go
|
||||
Remove Current Implementation
|
||||
- Remove pipe-based streaming
|
||||
- Remove background goroutine with single presigned URL
|
||||
- Remove global upload tracking map
|
||||
New ProxyBlobWriter Structure
|
||||
type ProxyBlobWriter struct {
|
||||
store *ProxyBlobStore
|
||||
options distribution.CreateOptions
|
||||
uploadID string // S3 multipart upload ID
|
||||
parts []CompletedPart // Track uploaded parts with ETags
|
||||
partNumber int // Current part number (starts at 1)
|
||||
buffer *bytes.Buffer // Buffer for current part
|
||||
size int64 // Total bytes written
|
||||
closed bool
|
||||
id string // Distribution's upload ID (for state)
|
||||
startedAt time.Time
|
||||
finalDigest string // Set on Commit
|
||||
}
|
||||
type CompletedPart struct {
|
||||
PartNumber int
|
||||
ETag string
|
||||
}
|
||||
New Create() - Initiate Multipart Upload
|
||||
func (p *ProxyBlobStore) Create(ctx context.Context, options ...distribution.BlobCreateOption) (distribution.BlobWriter, error) {
|
||||
var opts distribution.CreateOptions
|
||||
for _, option := range options {
|
||||
if err := option.Apply(&opts); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
// Use temp digest for upload location
|
||||
writerID := fmt.Sprintf("upload-%d", time.Now().UnixNano())
|
||||
tempDigest := digest.Digest(fmt.Sprintf("uploads/temp-%s", writerID))
|
||||
// Start multipart upload via hold service
|
||||
uploadID, err := p.startMultipartUpload(ctx, tempDigest)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("failed to start multipart upload: %w", err)
|
||||
}
|
||||
writer := &ProxyBlobWriter{
|
||||
store: p,
|
||||
options: opts,
|
||||
uploadID: uploadID,
|
||||
parts: make([]CompletedPart, 0),
|
||||
partNumber: 1,
|
||||
buffer: bytes.NewBuffer(make([]byte, 0, 5*1024*1024)), // 5MB buffer
|
||||
id: writerID,
|
||||
startedAt: time.Now(),
|
||||
}
|
||||
// Store in global map for Resume()
|
||||
globalUploadsMu.Lock()
|
||||
globalUploads[writer.id] = writer
|
||||
globalUploadsMu.Unlock()
|
||||
return writer, nil
|
||||
}
|
||||
New Write() - Buffer and Flush Parts
|
||||
func (w *ProxyBlobWriter) Write(p []byte) (int, error) {
|
||||
if w.closed {
|
||||
return 0, fmt.Errorf("writer closed")
|
||||
}
|
||||
n, err := w.buffer.Write(p)
|
||||
w.size += int64(n)
|
||||
// Flush if buffer reaches 5MB (S3 minimum part size)
|
||||
if w.buffer.Len() >= 5*1024*1024 {
|
||||
if err := w.flushPart(); err != nil {
|
||||
return n, err
|
||||
}
|
||||
}
|
||||
return n, err
|
||||
}
|
||||
func (w *ProxyBlobWriter) flushPart() error {
|
||||
if w.buffer.Len() == 0 {
|
||||
return nil
|
||||
}
|
||||
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
|
||||
defer cancel()
|
||||
// Get presigned URL for this part
|
||||
tempDigest := digest.Digest(fmt.Sprintf("uploads/temp-%s", w.id))
|
||||
url, err := w.store.getPartPresignedURL(ctx, tempDigest, w.uploadID, w.partNumber)
|
||||
if err != nil {
|
||||
return fmt.Errorf("failed to get part presigned URL: %w", err)
|
||||
}
|
||||
// Upload part to S3
|
||||
req, err := http.NewRequestWithContext(ctx, "PUT", url, bytes.NewReader(w.buffer.Bytes()))
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
resp, err := w.store.httpClient.Do(req)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
defer resp.Body.Close()
|
||||
if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
|
||||
return fmt.Errorf("part upload failed: status %d", resp.StatusCode)
|
||||
}
|
||||
// Store ETag for completion
|
||||
etag := resp.Header.Get("ETag")
|
||||
if etag == "" {
|
||||
return fmt.Errorf("no ETag in response")
|
||||
}
|
||||
w.parts = append(w.parts, CompletedPart{
|
||||
PartNumber: w.partNumber,
|
||||
ETag: etag,
|
||||
})
|
||||
// Reset buffer and increment part number
|
||||
w.buffer.Reset()
|
||||
w.partNumber++
|
||||
return nil
|
||||
}
|
||||
New Commit() - Complete Multipart and Move
|
||||
func (w *ProxyBlobWriter) Commit(ctx context.Context, desc distribution.Descriptor) (distribution.Descriptor, error) {
|
||||
if w.closed {
|
||||
return distribution.Descriptor{}, fmt.Errorf("writer closed")
|
||||
}
|
||||
w.closed = true
|
||||
// Flush any remaining buffered data
|
||||
if w.buffer.Len() > 0 {
|
||||
if err := w.flushPart(); err != nil {
|
||||
// Try to abort multipart on error
|
||||
w.store.abortMultipartUpload(ctx, w.uploadID)
|
||||
return distribution.Descriptor{}, err
|
||||
}
|
||||
}
|
||||
// Complete multipart upload at temp location
|
||||
tempDigest := digest.Digest(fmt.Sprintf("uploads/temp-%s", w.id))
|
||||
if err := w.store.completeMultipartUpload(ctx, tempDigest, w.uploadID, w.parts); err != nil {
|
||||
return distribution.Descriptor{}, err
|
||||
}
|
||||
// Move from temp → final location (server-side S3 copy)
|
||||
tempPath := fmt.Sprintf("uploads/temp-%s", w.id)
|
||||
finalPath := desc.Digest.String()
|
||||
moveURL := fmt.Sprintf("%s/move?from=%s&to=%s&did=%s",
|
||||
w.store.storageEndpoint, tempPath, finalPath, w.store.did)
|
||||
req, err := http.NewRequestWithContext(ctx, "POST", moveURL, nil)
|
||||
if err != nil {
|
||||
return distribution.Descriptor{}, err
|
||||
}
|
||||
resp, err := w.store.httpClient.Do(req)
|
||||
if err != nil {
|
||||
return distribution.Descriptor{}, err
|
||||
}
|
||||
defer resp.Body.Close()
|
||||
if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
|
||||
bodyBytes, _ := io.ReadAll(resp.Body)
|
||||
return distribution.Descriptor{}, fmt.Errorf("move failed: %d, %s", resp.StatusCode, bodyBytes)
|
||||
}
|
||||
// Remove from global map
|
||||
globalUploadsMu.Lock()
|
||||
delete(globalUploads, w.id)
|
||||
globalUploadsMu.Unlock()
|
||||
return distribution.Descriptor{
|
||||
Digest: desc.Digest,
|
||||
Size: w.size,
|
||||
MediaType: desc.MediaType,
|
||||
}, nil
|
||||
}
|
||||
Add Hold Service Client Methods
|
||||
func (p *ProxyBlobStore) startMultipartUpload(ctx context.Context, dgst digest.Digest) (string, error) {
|
||||
reqBody := map[string]any{
|
||||
"did": p.did,
|
||||
"digest": dgst.String(),
|
||||
}
|
||||
body, _ := json.Marshal(reqBody)
|
||||
url := fmt.Sprintf("%s/start-multipart", p.storageEndpoint)
|
||||
req, _ := http.NewRequestWithContext(ctx, "POST", url, bytes.NewReader(body))
|
||||
req.Header.Set("Content-Type", "application/json")
|
||||
resp, err := p.httpClient.Do(req)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
defer resp.Body.Close()
|
||||
var result struct {
|
||||
UploadID string `json:"upload_id"`
|
||||
}
|
||||
if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
|
||||
return "", err
|
||||
}
|
||||
return result.UploadID, nil
|
||||
}
|
||||
func (p *ProxyBlobStore) getPartPresignedURL(ctx context.Context, dgst digest.Digest, uploadID string, partNumber int) (string, error) {
|
||||
reqBody := map[string]any{
|
||||
"did": p.did,
|
||||
"digest": dgst.String(),
|
||||
"upload_id": uploadID,
|
||||
"part_number": partNumber,
|
||||
}
|
||||
body, _ := json.Marshal(reqBody)
|
||||
url := fmt.Sprintf("%s/part-presigned-url", p.storageEndpoint)
|
||||
req, _ := http.NewRequestWithContext(ctx, "POST", url, bytes.NewReader(body))
|
||||
req.Header.Set("Content-Type", "application/json")
|
||||
resp, err := p.httpClient.Do(req)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
defer resp.Body.Close()
|
||||
var result struct {
|
||||
URL string `json:"url"`
|
||||
}
|
||||
if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
|
||||
return "", err
|
||||
}
|
||||
return result.URL, nil
|
||||
}
|
||||
func (p *ProxyBlobStore) completeMultipartUpload(ctx context.Context, dgst digest.Digest, uploadID string, parts []CompletedPart) error {
|
||||
reqBody := map[string]any{
|
||||
"did": p.did,
|
||||
"digest": dgst.String(),
|
||||
"upload_id": uploadID,
|
||||
"parts": parts,
|
||||
}
|
||||
body, _ := json.Marshal(reqBody)
|
||||
url := fmt.Sprintf("%s/complete-multipart", p.storageEndpoint)
|
||||
req, _ := http.NewRequestWithContext(ctx, "POST", url, bytes.NewReader(body))
|
||||
req.Header.Set("Content-Type", "application/json")
|
||||
resp, err := p.httpClient.Do(req)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
defer resp.Body.Close()
|
||||
if resp.StatusCode != http.StatusOK {
|
||||
return fmt.Errorf("complete multipart failed: status %d", resp.StatusCode)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
---
|
||||
Testing Plan
|
||||
1. Unit Tests
|
||||
- Test multipart upload initiation
|
||||
- Test part upload with presigned URLs
|
||||
- Test completion with ETags
|
||||
- Test abort on errors
|
||||
2. Integration Tests
|
||||
- Push small images (< 5MB, single part)
|
||||
- Push medium images (10MB, 2 parts)
|
||||
- Push large images (100MB, 20 parts)
|
||||
- Test with Upcloud S3
|
||||
- Test with Storj S3
|
||||
3. Validation
|
||||
- Monitor logs for "client disconnected" errors (should be gone)
|
||||
- Check Docker push success rate
|
||||
- Verify blobs stored correctly in S3
|
||||
- Check bandwidth usage on hold service (should be minimal)
|
||||
---
|
||||
Migration & Deployment
|
||||
Backward Compatibility
|
||||
- Keep /put-presigned-url endpoint for fallback
|
||||
- Keep /move endpoint (still needed)
|
||||
- New multipart endpoints are additive
|
||||
Deployment Steps
|
||||
1. Update hold service with new endpoints
|
||||
2. Update AppView ProxyBlobStore
|
||||
3. Deploy hold service first
|
||||
4. Deploy AppView
|
||||
5. Test with sample push
|
||||
6. Monitor logs
|
||||
Rollback Plan
|
||||
- Revert AppView to previous version (uses old presigned URL method)
|
||||
- Hold service keeps both old and new endpoints
|
||||
---
|
||||
Documentation Updates
|
||||
Update docs/PRESIGNED_URLS.md
|
||||
- Add section "Multipart Upload for Chunked Data"
|
||||
- Explain why single presigned URLs don't work with PATCH
|
||||
- Document new endpoints and flow
|
||||
- Add S3 part size recommendations (5MB-64MB for Storj)
|
||||
Add Troubleshooting Section
|
||||
- "Client disconnected during PATCH" → resolved by multipart
|
||||
- Storj-specific considerations (64MB parts recommended)
|
||||
- Upcloud compatibility notes
|
||||
---
|
||||
Performance Impact
|
||||
Before (Broken)
|
||||
- Docker PATCH → blocks on pipe → timeout → retry → fail
|
||||
- Unable to push large images reliably
|
||||
After (Multipart)
|
||||
- Each PATCH → independent part upload → immediate response
|
||||
- No blocking, no timeouts
|
||||
- Parallel part uploads possible (future optimization)
|
||||
- Reliable pushes for any image size
|
||||
Bandwidth
|
||||
- Hold service: Only API calls (~1KB per part)
|
||||
- Direct S3 uploads: Full blob data
|
||||
- S3 copy for move: Server-side (no hold bandwidth)
|
||||
Estimated savings: 99.98% hold service bandwidth reduction (same as before, but now actually works!)
|
||||
File diff suppressed because it is too large
Load Diff
@@ -718,6 +718,55 @@ PRESIGNED_URLS_ENABLED=false docker-compose restart atcr-hold
|
||||
|
||||
The implementation has automatic fallbacks, so partial failures won't break functionality.
|
||||
|
||||
## Testing with DISABLE_PRESIGNED_URLS
|
||||
|
||||
### Environment Variable
|
||||
|
||||
Set `DISABLE_PRESIGNED_URLS=true` to force proxy/buffered mode even when S3 is configured.
|
||||
|
||||
**Use cases:**
|
||||
- Testing proxy/buffered code paths with S3 storage
|
||||
- Debugging multipart uploads in buffered mode
|
||||
- Simulating S3 providers that don't support presigned URLs
|
||||
- Verifying fallback behavior works correctly
|
||||
|
||||
### How It Works
|
||||
|
||||
When `DISABLE_PRESIGNED_URLS=true`:
|
||||
|
||||
**Single blob operations:**
|
||||
- `getDownloadURL()` returns proxy URL instead of S3 presigned URL
|
||||
- `getHeadURL()` returns proxy URL instead of S3 presigned HEAD URL
|
||||
- `getUploadURL()` returns proxy URL instead of S3 presigned PUT URL
|
||||
- Client uses `/blobs/{digest}` endpoints (proxy through hold service)
|
||||
|
||||
**Multipart uploads:**
|
||||
- `StartMultipartUploadWithManager()` creates **Buffered** session instead of **S3Native**
|
||||
- `GetPartUploadURL()` returns `/multipart-parts/{uploadID}/{partNumber}` instead of S3 presigned URL
|
||||
- Parts are buffered in memory in the hold service
|
||||
- `CompleteMultipartUploadWithManager()` assembles parts and writes via storage driver
|
||||
|
||||
### Testing Example
|
||||
|
||||
```bash
|
||||
# Test S3 with forced proxy mode
|
||||
export STORAGE_DRIVER=s3
|
||||
export S3_BUCKET=my-bucket
|
||||
export AWS_ACCESS_KEY_ID=...
|
||||
export AWS_SECRET_ACCESS_KEY=...
|
||||
export DISABLE_PRESIGNED_URLS=true # Force buffered/proxy mode
|
||||
|
||||
./bin/atcr-hold
|
||||
|
||||
# Push an image - should use proxy mode
|
||||
docker push atcr.io/yourdid/test:latest
|
||||
|
||||
# Check logs for:
|
||||
# "Presigned URLs disabled, using proxy URL"
|
||||
# "Presigned URLs disabled (DISABLE_PRESIGNED_URLS=true), using buffered mode"
|
||||
# "Stored part: uploadID=... part=1 size=..."
|
||||
```
|
||||
|
||||
## Future Enhancements
|
||||
|
||||
### 1. Configurable Expiration
|
||||
|
||||
Reference in New Issue
Block a user