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@@ -1,1341 +0,0 @@
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-# Content-Addressable Storage (CAS) with Symlink Farm Architecture
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-
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-## Table of Contents
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-- [Overview](#overview)
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-- [Architecture Design](#architecture-design)
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-- [Database Models](#database-models)
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-- [Storage Backends](#storage-backends)
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-- [Symlink Farm Views](#symlink-farm-views)
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-- [Automatic Synchronization](#automatic-synchronization)
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-- [Migration Strategy](#migration-strategy)
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-- [Verification and Repair](#verification-and-repair)
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-- [Configuration](#configuration)
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-- [Workflow Examples](#workflow-examples)
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-- [Benefits](#benefits)
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-
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-## Overview
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-
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-### Problem Statement
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-ArchiveBox currently stores files in a timestamp-based structure:
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-```
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-/data/archive/{timestamp}/{extractor}/filename.ext
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-```
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-
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-This leads to:
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-- **Massive duplication**: `jquery.min.js` stored 1000x across different snapshots
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-- **No S3 support**: Direct filesystem coupling
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-- **Inflexible organization**: Hard to browse by domain, date, or user
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-
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-### Solution: Content-Addressable Storage + Symlink Farm
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-
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-**Core Concept:**
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-1. **Store files once** in content-addressable storage (CAS) by hash
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-2. **Create symlink farms** in multiple human-readable views
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-3. **Database as source of truth** with automatic sync
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-4. **Support S3 and local storage** via django-storages
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-
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-**Storage Layout:**
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-```
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-/data/
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-├── cas/ # Content-addressable storage (deduplicated)
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-│ └── sha256/
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-│ └── ab/
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-│ └── cd/
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-│ └── abcdef123... # Actual file (stored once)
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-│
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-├── archive/ # Human-browseable views (all symlinks)
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-│ ├── by_domain/
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-│ │ └── example.com/
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-│ │ └── 20241225/
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-│ │ └── 019b54ee-28d9-72dc/
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-│ │ ├── wget/
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-│ │ │ └── index.html -> ../../../../../cas/sha256/ab/cd/abcdef...
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-│ │ └── singlefile/
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-│ │ └── page.html -> ../../../../../cas/sha256/ef/12/ef1234...
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-│ │
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-│ ├── by_date/
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-│ │ └── 20241225/
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-│ │ └── example.com/
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-│ │ └── 019b54ee-28d9-72dc/
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-│ │ └── wget/
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-│ │ └── index.html -> ../../../../../../cas/sha256/ab/cd/abcdef...
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-│ │
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-│ ├── by_user/
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-│ │ └── squash/
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-│ │ └── 20241225/
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-│ │ └── example.com/
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-│ │ └── 019b54ee-28d9-72dc/
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-│ │
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-│ └── by_timestamp/ # Legacy compatibility
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-│ └── 1735142400.123/
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-│ └── wget/
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-│ └── index.html -> ../../../../cas/sha256/ab/cd/abcdef...
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-```
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-
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-## Architecture Design
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-
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-### Core Principles
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-
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-1. **Database = Source of Truth**: The `SnapshotFile` model is authoritative
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-2. **Symlinks = Materialized Views**: Auto-generated from DB, disposable
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-3. **Atomic Updates**: Symlinks created/deleted with DB transactions
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-4. **Idempotent**: Operations can be safely retried
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-5. **Self-Healing**: Automatic detection and repair of drift
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-6. **Content-Addressable**: Files deduplicated by SHA-256 hash
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-7. **Storage Agnostic**: Works with local filesystem, S3, Azure, etc.
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-
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-### Space Overhead Analysis
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-
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-Symlinks are incredibly cheap:
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-```
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-Typical symlink size:
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-- ext4/XFS: ~60-100 bytes
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-- ZFS: ~120 bytes
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-- btrfs: ~80 bytes
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-
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-Example calculation:
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-100,000 files × 4 views = 400,000 symlinks
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-400,000 symlinks × 100 bytes = 40 MB
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-
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-Space saved by deduplication:
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-- Average 30% duplicate content across archives
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-- 100GB archive → saves ~30GB
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-- Symlink overhead: 0.04GB (0.13% of savings!)
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-
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-Verdict: Symlinks are FREE compared to deduplication savings
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-```
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-
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-## Database Models
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-
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-### Blob Model
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-
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-```python
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-# archivebox/core/models.py
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-
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-class Blob(models.Model):
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- """
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- Immutable content-addressed blob.
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- Stored as: /cas/{hash_algorithm}/{ab}/{cd}/{full_hash}
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- """
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-
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- # Content identification
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- hash_algorithm = models.CharField(max_length=16, default='sha256', db_index=True)
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- hash = models.CharField(max_length=128, db_index=True)
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- size = models.BigIntegerField()
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-
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- # Storage location
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- storage_backend = models.CharField(
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- max_length=32,
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- default='local',
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- choices=[
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- ('local', 'Local Filesystem'),
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- ('s3', 'S3'),
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- ('azure', 'Azure Blob Storage'),
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- ('gcs', 'Google Cloud Storage'),
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- ],
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- db_index=True,
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- )
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-
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- # Metadata
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- mime_type = models.CharField(max_length=255, blank=True)
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- created_at = models.DateTimeField(auto_now_add=True, db_index=True)
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-
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- # Reference counting (for garbage collection)
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- ref_count = models.IntegerField(default=0, db_index=True)
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-
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- class Meta:
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- unique_together = [('hash_algorithm', 'hash', 'storage_backend')]
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- indexes = [
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- models.Index(fields=['hash_algorithm', 'hash']),
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- models.Index(fields=['ref_count']),
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- models.Index(fields=['storage_backend', 'created_at']),
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- ]
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- constraints = [
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- # Ensure ref_count is never negative
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- models.CheckConstraint(
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- check=models.Q(ref_count__gte=0),
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- name='blob_ref_count_positive'
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- ),
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- ]
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-
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- def __str__(self):
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- return f"Blob({self.hash[:16]}..., refs={self.ref_count})"
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-
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- @property
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- def storage_path(self) -> str:
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- """Content-addressed path: sha256/ab/cd/abcdef123..."""
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- h = self.hash
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- return f"{self.hash_algorithm}/{h[:2]}/{h[2:4]}/{h}"
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-
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- def get_file_url(self):
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- """Get URL to access this blob"""
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- from django.core.files.storage import default_storage
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- return default_storage.url(self.storage_path)
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-
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-
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-class SnapshotFile(models.Model):
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- """
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- Links a Snapshot to its files (many-to-many through Blob).
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- Preserves original path information for backwards compatibility.
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- """
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-
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- snapshot = models.ForeignKey(
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- Snapshot,
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- on_delete=models.CASCADE,
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- related_name='files'
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- )
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- blob = models.ForeignKey(
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- Blob,
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- on_delete=models.PROTECT # PROTECT: can't delete blob while referenced
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- )
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-
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- # Original path information
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- extractor = models.CharField(max_length=32) # 'wget', 'singlefile', etc.
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- relative_path = models.CharField(max_length=512) # 'output.html', 'warc/example.warc.gz'
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-
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- # Metadata
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- created_at = models.DateTimeField(auto_now_add=True, db_index=True)
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-
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- class Meta:
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- unique_together = [('snapshot', 'extractor', 'relative_path')]
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- indexes = [
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- models.Index(fields=['snapshot', 'extractor']),
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- models.Index(fields=['blob']),
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- models.Index(fields=['created_at']),
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- ]
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-
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- def __str__(self):
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- return f"{self.snapshot.id}/{self.extractor}/{self.relative_path}"
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-
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- @property
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- def logical_path(self) -> Path:
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- """Virtual path as it would appear in old structure"""
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- return Path(self.snapshot.output_dir) / self.extractor / self.relative_path
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-
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- def save(self, *args, **kwargs):
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- """Override save to ensure paths are normalized"""
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- # Normalize path (no leading slash, use forward slashes)
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- self.relative_path = self.relative_path.lstrip('/').replace('\\', '/')
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- super().save(*args, **kwargs)
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-```
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-
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-### Updated Snapshot Model
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-
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-```python
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-class Snapshot(ModelWithOutputDir, ...):
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- # ... existing fields ...
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-
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- @property
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- def output_dir(self) -> Path:
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- """
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- Returns the primary view directory for browsing.
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- Falls back to legacy if needed.
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- """
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- # Try by_timestamp view first (best compatibility)
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- by_timestamp = CONSTANTS.ARCHIVE_DIR / 'by_timestamp' / self.timestamp
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- if by_timestamp.exists():
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- return by_timestamp
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-
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- # Fall back to legacy location (pre-CAS archives)
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- legacy = CONSTANTS.ARCHIVE_DIR / self.timestamp
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- if legacy.exists():
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- return legacy
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-
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- # Default to by_timestamp for new snapshots
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- return by_timestamp
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-
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- def get_output_dir(self, view: str = 'by_timestamp') -> Path:
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- """Get output directory for a specific view"""
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- from storage.views import ViewManager
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- from urllib.parse import urlparse
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-
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- if view not in ViewManager.VIEWS:
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- raise ValueError(f"Unknown view: {view}")
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-
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- if view == 'by_domain':
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- domain = urlparse(self.url).netloc or 'unknown'
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- date = self.created_at.strftime('%Y%m%d')
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- return CONSTANTS.ARCHIVE_DIR / 'by_domain' / domain / date / str(self.id)
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-
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- elif view == 'by_date':
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- domain = urlparse(self.url).netloc or 'unknown'
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- date = self.created_at.strftime('%Y%m%d')
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- return CONSTANTS.ARCHIVE_DIR / 'by_date' / date / domain / str(self.id)
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-
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- elif view == 'by_user':
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- domain = urlparse(self.url).netloc or 'unknown'
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- date = self.created_at.strftime('%Y%m%d')
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- user = self.created_by.username
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- return CONSTANTS.ARCHIVE_DIR / 'by_user' / user / date / domain / str(self.id)
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-
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- elif view == 'by_timestamp':
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- return CONSTANTS.ARCHIVE_DIR / 'by_timestamp' / self.timestamp
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-
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- return self.output_dir
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-```
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-
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-### Updated ArchiveResult Model
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-
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-```python
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-class ArchiveResult(models.Model):
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- # ... existing fields ...
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-
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- # Note: output_dir field is removed (was deprecated)
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- # Keep: output (relative path to primary output file)
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-
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- @property
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- def output_files(self):
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- """Get all files for this extractor"""
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- return self.snapshot.files.filter(extractor=self.extractor)
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-
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- @property
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- def primary_output_file(self):
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- """Get the primary output file (e.g., 'output.html')"""
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- if self.output:
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- return self.snapshot.files.filter(
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- extractor=self.extractor,
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- relative_path=self.output
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- ).first()
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- return None
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-```
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-
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-## Storage Backends
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-
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-### Django Storage Configuration
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-
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-```python
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-# settings.py or archivebox/config/settings.py
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-
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-# For local development/testing
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-STORAGES = {
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- "default": {
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- "BACKEND": "django.core.files.storage.FileSystemStorage",
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- "OPTIONS": {
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- "location": "/data/cas",
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- "base_url": "/cas/",
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- },
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- },
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- "staticfiles": {
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- "BACKEND": "django.contrib.staticfiles.storage.StaticFilesStorage",
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- },
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-}
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-
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-# For production with S3
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-STORAGES = {
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- "default": {
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- "BACKEND": "storages.backends.s3.S3Storage",
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- "OPTIONS": {
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- "bucket_name": "archivebox-blobs",
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- "region_name": "us-east-1",
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- "default_acl": "private",
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- "object_parameters": {
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- "StorageClass": "INTELLIGENT_TIERING", # Auto-optimize storage costs
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- },
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- },
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- },
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-}
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-```
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-
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-### Blob Manager
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-
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-```python
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-# archivebox/storage/ingest.py
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-
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-import hashlib
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-from django.core.files.storage import default_storage
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-from django.core.files.base import ContentFile
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-from django.db import transaction
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-from pathlib import Path
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-import os
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-
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-class BlobManager:
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- """Manages content-addressed blob storage with deduplication"""
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-
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- @staticmethod
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- def hash_file(file_path: Path, algorithm='sha256') -> str:
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- """Calculate content hash of a file"""
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- hasher = hashlib.new(algorithm)
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- with open(file_path, 'rb') as f:
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- for chunk in iter(lambda: f.read(65536), b''):
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- hasher.update(chunk)
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- return hasher.hexdigest()
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-
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- @staticmethod
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- def ingest_file(
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- file_path: Path,
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- snapshot,
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- extractor: str,
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- relative_path: str,
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- mime_type: str = '',
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- create_views: bool = True,
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- ) -> SnapshotFile:
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- """
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- Ingest a file into blob storage with deduplication.
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-
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- Args:
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- file_path: Path to the file to ingest
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- snapshot: Snapshot this file belongs to
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- extractor: Extractor name (wget, singlefile, etc.)
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- relative_path: Relative path within extractor dir
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- mime_type: MIME type of the file
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- create_views: Whether to create symlink views
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-
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- Returns:
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- SnapshotFile reference
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- """
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- from storage.views import ViewManager
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-
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- # Calculate hash
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- file_hash = BlobManager.hash_file(file_path)
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- file_size = file_path.stat().st_size
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-
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- with transaction.atomic():
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- # Check if blob already exists (deduplication!)
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- blob, created = Blob.objects.get_or_create(
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- hash_algorithm='sha256',
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- hash=file_hash,
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- storage_backend='local',
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- defaults={
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- 'size': file_size,
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- 'mime_type': mime_type,
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- }
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- )
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-
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- if created:
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- # New blob - store in CAS
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- cas_path = ViewManager.get_cas_path(blob)
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- cas_path.parent.mkdir(parents=True, exist_ok=True)
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-
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- # Use hardlink if possible (instant), copy if not
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- try:
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- os.link(file_path, cas_path)
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- except OSError:
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- import shutil
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- shutil.copy2(file_path, cas_path)
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-
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- print(f"✓ Stored new blob: {file_hash[:16]}... ({file_size:,} bytes)")
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- else:
|
|
|
- print(f"✓ Deduplicated: {file_hash[:16]}... (saved {file_size:,} bytes)")
|
|
|
-
|
|
|
- # Increment reference count
|
|
|
- blob.ref_count += 1
|
|
|
- blob.save(update_fields=['ref_count'])
|
|
|
-
|
|
|
- # Create snapshot file reference
|
|
|
- snapshot_file, _ = SnapshotFile.objects.get_or_create(
|
|
|
- snapshot=snapshot,
|
|
|
- extractor=extractor,
|
|
|
- relative_path=relative_path,
|
|
|
- defaults={'blob': blob}
|
|
|
- )
|
|
|
-
|
|
|
- # Create symlink views (signal will also do this, but we can force it here)
|
|
|
- if create_views:
|
|
|
- views = ViewManager.create_symlinks(snapshot_file)
|
|
|
- print(f" Created {len(views)} view symlinks")
|
|
|
-
|
|
|
- return snapshot_file
|
|
|
-
|
|
|
- @staticmethod
|
|
|
- def ingest_directory(
|
|
|
- dir_path: Path,
|
|
|
- snapshot,
|
|
|
- extractor: str
|
|
|
- ) -> list[SnapshotFile]:
|
|
|
- """Ingest all files from a directory"""
|
|
|
- import mimetypes
|
|
|
-
|
|
|
- snapshot_files = []
|
|
|
-
|
|
|
- for file_path in dir_path.rglob('*'):
|
|
|
- if file_path.is_file():
|
|
|
- relative_path = str(file_path.relative_to(dir_path))
|
|
|
- mime_type, _ = mimetypes.guess_type(str(file_path))
|
|
|
-
|
|
|
- snapshot_file = BlobManager.ingest_file(
|
|
|
- file_path,
|
|
|
- snapshot,
|
|
|
- extractor,
|
|
|
- relative_path,
|
|
|
- mime_type or ''
|
|
|
- )
|
|
|
- snapshot_files.append(snapshot_file)
|
|
|
-
|
|
|
- return snapshot_files
|
|
|
-```
|
|
|
-
|
|
|
-## Symlink Farm Views
|
|
|
-
|
|
|
-### View Classes
|
|
|
-
|
|
|
-```python
|
|
|
-# archivebox/storage/views.py
|
|
|
-
|
|
|
-from pathlib import Path
|
|
|
-from typing import Protocol
|
|
|
-from urllib.parse import urlparse
|
|
|
-import os
|
|
|
-import logging
|
|
|
-
|
|
|
-logger = logging.getLogger(__name__)
|
|
|
-
|
|
|
-
|
|
|
-class SnapshotView(Protocol):
|
|
|
- """Protocol for generating browseable views of snapshots"""
|
|
|
-
|
|
|
- def get_view_path(self, snapshot_file: SnapshotFile) -> Path:
|
|
|
- """Get the human-readable path for this file in this view"""
|
|
|
- ...
|
|
|
-
|
|
|
-
|
|
|
-class ByDomainView:
|
|
|
- """View: /archive/by_domain/{domain}/{YYYYMMDD}/{snapshot_id}/{extractor}/{filename}"""
|
|
|
-
|
|
|
- def get_view_path(self, snapshot_file: SnapshotFile) -> Path:
|
|
|
- snapshot = snapshot_file.snapshot
|
|
|
- domain = urlparse(snapshot.url).netloc or 'unknown'
|
|
|
- date = snapshot.created_at.strftime('%Y%m%d')
|
|
|
-
|
|
|
- return (
|
|
|
- CONSTANTS.ARCHIVE_DIR / 'by_domain' / domain / date /
|
|
|
- str(snapshot.id) / snapshot_file.extractor / snapshot_file.relative_path
|
|
|
- )
|
|
|
-
|
|
|
-
|
|
|
-class ByDateView:
|
|
|
- """View: /archive/by_date/{YYYYMMDD}/{domain}/{snapshot_id}/{extractor}/{filename}"""
|
|
|
-
|
|
|
- def get_view_path(self, snapshot_file: SnapshotFile) -> Path:
|
|
|
- snapshot = snapshot_file.snapshot
|
|
|
- domain = urlparse(snapshot.url).netloc or 'unknown'
|
|
|
- date = snapshot.created_at.strftime('%Y%m%d')
|
|
|
-
|
|
|
- return (
|
|
|
- CONSTANTS.ARCHIVE_DIR / 'by_date' / date / domain /
|
|
|
- str(snapshot.id) / snapshot_file.extractor / snapshot_file.relative_path
|
|
|
- )
|
|
|
-
|
|
|
-
|
|
|
-class ByUserView:
|
|
|
- """View: /archive/by_user/{username}/{YYYYMMDD}/{domain}/{snapshot_id}/{extractor}/{filename}"""
|
|
|
-
|
|
|
- def get_view_path(self, snapshot_file: SnapshotFile) -> Path:
|
|
|
- snapshot = snapshot_file.snapshot
|
|
|
- user = snapshot.created_by.username
|
|
|
- domain = urlparse(snapshot.url).netloc or 'unknown'
|
|
|
- date = snapshot.created_at.strftime('%Y%m%d')
|
|
|
-
|
|
|
- return (
|
|
|
- CONSTANTS.ARCHIVE_DIR / 'by_user' / user / date / domain /
|
|
|
- str(snapshot.id) / snapshot_file.extractor / snapshot_file.relative_path
|
|
|
- )
|
|
|
-
|
|
|
-
|
|
|
-class LegacyTimestampView:
|
|
|
- """View: /archive/by_timestamp/{timestamp}/{extractor}/{filename}"""
|
|
|
-
|
|
|
- def get_view_path(self, snapshot_file: SnapshotFile) -> Path:
|
|
|
- snapshot = snapshot_file.snapshot
|
|
|
-
|
|
|
- return (
|
|
|
- CONSTANTS.ARCHIVE_DIR / 'by_timestamp' / snapshot.timestamp /
|
|
|
- snapshot_file.extractor / snapshot_file.relative_path
|
|
|
- )
|
|
|
-
|
|
|
-
|
|
|
-class ViewManager:
|
|
|
- """Manages symlink farm views"""
|
|
|
-
|
|
|
- VIEWS = {
|
|
|
- 'by_domain': ByDomainView(),
|
|
|
- 'by_date': ByDateView(),
|
|
|
- 'by_user': ByUserView(),
|
|
|
- 'by_timestamp': LegacyTimestampView(),
|
|
|
- }
|
|
|
-
|
|
|
- @staticmethod
|
|
|
- def get_cas_path(blob: Blob) -> Path:
|
|
|
- """Get the CAS storage path for a blob"""
|
|
|
- h = blob.hash
|
|
|
- return (
|
|
|
- CONSTANTS.DATA_DIR / 'cas' / blob.hash_algorithm /
|
|
|
- h[:2] / h[2:4] / h
|
|
|
- )
|
|
|
-
|
|
|
- @staticmethod
|
|
|
- def create_symlinks(snapshot_file: SnapshotFile, views: list[str] = None) -> dict[str, Path]:
|
|
|
- """
|
|
|
- Create symlinks for all views of a file.
|
|
|
- If any operation fails, all are rolled back.
|
|
|
- """
|
|
|
- from config.common import STORAGE_CONFIG
|
|
|
-
|
|
|
- if views is None:
|
|
|
- views = STORAGE_CONFIG.ENABLED_VIEWS
|
|
|
-
|
|
|
- cas_path = ViewManager.get_cas_path(snapshot_file.blob)
|
|
|
-
|
|
|
- # Verify CAS file exists before creating symlinks
|
|
|
- if not cas_path.exists():
|
|
|
- raise FileNotFoundError(f"CAS file missing: {cas_path}")
|
|
|
-
|
|
|
- created = {}
|
|
|
- cleanup_on_error = []
|
|
|
-
|
|
|
- try:
|
|
|
- for view_name in views:
|
|
|
- if view_name not in ViewManager.VIEWS:
|
|
|
- continue
|
|
|
-
|
|
|
- view = ViewManager.VIEWS[view_name]
|
|
|
- view_path = view.get_view_path(snapshot_file)
|
|
|
-
|
|
|
- # Create parent directory
|
|
|
- view_path.parent.mkdir(parents=True, exist_ok=True)
|
|
|
-
|
|
|
- # Create relative symlink (more portable)
|
|
|
- rel_target = os.path.relpath(cas_path, view_path.parent)
|
|
|
-
|
|
|
- # Remove existing symlink/file if present
|
|
|
- if view_path.exists() or view_path.is_symlink():
|
|
|
- view_path.unlink()
|
|
|
-
|
|
|
- # Create symlink
|
|
|
- view_path.symlink_to(rel_target)
|
|
|
- created[view_name] = view_path
|
|
|
- cleanup_on_error.append(view_path)
|
|
|
-
|
|
|
- return created
|
|
|
-
|
|
|
- except Exception as e:
|
|
|
- # Rollback: Remove partially created symlinks
|
|
|
- for path in cleanup_on_error:
|
|
|
- try:
|
|
|
- if path.exists() or path.is_symlink():
|
|
|
- path.unlink()
|
|
|
- except Exception as cleanup_error:
|
|
|
- logger.error(f"Failed to cleanup {path}: {cleanup_error}")
|
|
|
-
|
|
|
- raise Exception(f"Failed to create symlinks: {e}")
|
|
|
-
|
|
|
- @staticmethod
|
|
|
- def create_symlinks_idempotent(snapshot_file: SnapshotFile, views: list[str] = None):
|
|
|
- """
|
|
|
- Idempotent version - safe to call multiple times.
|
|
|
- Returns dict of created symlinks, or empty dict if already correct.
|
|
|
- """
|
|
|
- from config.common import STORAGE_CONFIG
|
|
|
-
|
|
|
- if views is None:
|
|
|
- views = STORAGE_CONFIG.ENABLED_VIEWS
|
|
|
-
|
|
|
- cas_path = ViewManager.get_cas_path(snapshot_file.blob)
|
|
|
- needs_update = False
|
|
|
-
|
|
|
- # Check if all symlinks exist and point to correct target
|
|
|
- for view_name in views:
|
|
|
- if view_name not in ViewManager.VIEWS:
|
|
|
- continue
|
|
|
-
|
|
|
- view = ViewManager.VIEWS[view_name]
|
|
|
- view_path = view.get_view_path(snapshot_file)
|
|
|
-
|
|
|
- if not view_path.is_symlink():
|
|
|
- needs_update = True
|
|
|
- break
|
|
|
-
|
|
|
- # Check if symlink points to correct target
|
|
|
- try:
|
|
|
- current_target = view_path.resolve()
|
|
|
- if current_target != cas_path:
|
|
|
- needs_update = True
|
|
|
- break
|
|
|
- except Exception:
|
|
|
- needs_update = True
|
|
|
- break
|
|
|
-
|
|
|
- if needs_update:
|
|
|
- return ViewManager.create_symlinks(snapshot_file, views)
|
|
|
-
|
|
|
- return {} # Already correct
|
|
|
-
|
|
|
- @staticmethod
|
|
|
- def cleanup_symlinks(snapshot_file: SnapshotFile):
|
|
|
- """Remove all symlinks for a file"""
|
|
|
- from config.common import STORAGE_CONFIG
|
|
|
-
|
|
|
- for view_name in STORAGE_CONFIG.ENABLED_VIEWS:
|
|
|
- if view_name not in ViewManager.VIEWS:
|
|
|
- continue
|
|
|
-
|
|
|
- view = ViewManager.VIEWS[view_name]
|
|
|
- view_path = view.get_view_path(snapshot_file)
|
|
|
-
|
|
|
- if view_path.exists() or view_path.is_symlink():
|
|
|
- view_path.unlink()
|
|
|
- logger.info(f"Removed symlink: {view_path}")
|
|
|
-```
|
|
|
-
|
|
|
-## Automatic Synchronization
|
|
|
-
|
|
|
-### Django Signals for Sync
|
|
|
-
|
|
|
-```python
|
|
|
-# archivebox/storage/signals.py
|
|
|
-
|
|
|
-from django.db.models.signals import post_save, post_delete, pre_delete
|
|
|
-from django.dispatch import receiver
|
|
|
-from django.db import transaction
|
|
|
-from core.models import SnapshotFile, Blob
|
|
|
-import logging
|
|
|
-
|
|
|
-logger = logging.getLogger(__name__)
|
|
|
-
|
|
|
-
|
|
|
-@receiver(post_save, sender=SnapshotFile)
|
|
|
-def sync_symlinks_on_save(sender, instance, created, **kwargs):
|
|
|
- """
|
|
|
- Automatically create/update symlinks when SnapshotFile is saved.
|
|
|
- Runs AFTER transaction commit to ensure DB consistency.
|
|
|
- """
|
|
|
- from config.common import STORAGE_CONFIG
|
|
|
-
|
|
|
- if not STORAGE_CONFIG.AUTO_SYNC_SYMLINKS:
|
|
|
- return
|
|
|
-
|
|
|
- if created:
|
|
|
- # New file - create all symlinks
|
|
|
- try:
|
|
|
- from storage.views import ViewManager
|
|
|
- views = ViewManager.create_symlinks(instance)
|
|
|
- logger.info(f"Created {len(views)} symlinks for {instance.relative_path}")
|
|
|
- except Exception as e:
|
|
|
- logger.error(f"Failed to create symlinks for {instance.id}: {e}")
|
|
|
- # Don't fail the transaction - can be repaired later
|
|
|
-
|
|
|
-
|
|
|
-@receiver(pre_delete, sender=SnapshotFile)
|
|
|
-def sync_symlinks_on_delete(sender, instance, **kwargs):
|
|
|
- """
|
|
|
- Remove symlinks when SnapshotFile is deleted.
|
|
|
- Runs BEFORE deletion so we still have the data.
|
|
|
- """
|
|
|
- try:
|
|
|
- from storage.views import ViewManager
|
|
|
- ViewManager.cleanup_symlinks(instance)
|
|
|
- logger.info(f"Removed symlinks for {instance.relative_path}")
|
|
|
- except Exception as e:
|
|
|
- logger.error(f"Failed to remove symlinks for {instance.id}: {e}")
|
|
|
-
|
|
|
-
|
|
|
-@receiver(post_delete, sender=SnapshotFile)
|
|
|
-def cleanup_unreferenced_blob(sender, instance, **kwargs):
|
|
|
- """
|
|
|
- Decrement blob reference count and cleanup if no longer referenced.
|
|
|
- """
|
|
|
- try:
|
|
|
- blob = instance.blob
|
|
|
-
|
|
|
- # Atomic decrement
|
|
|
- from django.db.models import F
|
|
|
- Blob.objects.filter(pk=blob.pk).update(ref_count=F('ref_count') - 1)
|
|
|
-
|
|
|
- # Reload to get updated count
|
|
|
- blob.refresh_from_db()
|
|
|
-
|
|
|
- # Garbage collect if no more references
|
|
|
- if blob.ref_count <= 0:
|
|
|
- from storage.views import ViewManager
|
|
|
- cas_path = ViewManager.get_cas_path(blob)
|
|
|
-
|
|
|
- if cas_path.exists():
|
|
|
- cas_path.unlink()
|
|
|
- logger.info(f"Garbage collected blob {blob.hash[:16]}...")
|
|
|
-
|
|
|
- blob.delete()
|
|
|
-
|
|
|
- except Exception as e:
|
|
|
- logger.error(f"Failed to cleanup blob: {e}")
|
|
|
-```
|
|
|
-
|
|
|
-### App Configuration
|
|
|
-
|
|
|
-```python
|
|
|
-# archivebox/storage/apps.py
|
|
|
-
|
|
|
-from django.apps import AppConfig
|
|
|
-
|
|
|
-class StorageConfig(AppConfig):
|
|
|
- default_auto_field = 'django.db.models.BigAutoField'
|
|
|
- name = 'storage'
|
|
|
-
|
|
|
- def ready(self):
|
|
|
- import storage.signals # Register signal handlers
|
|
|
-```
|
|
|
-
|
|
|
-## Migration Strategy
|
|
|
-
|
|
|
-### Migration Command
|
|
|
-
|
|
|
-```python
|
|
|
-# archivebox/core/management/commands/migrate_to_cas.py
|
|
|
-
|
|
|
-from django.core.management.base import BaseCommand
|
|
|
-from django.db.models import Q
|
|
|
-from core.models import Snapshot
|
|
|
-from storage.ingest import BlobManager
|
|
|
-from storage.views import ViewManager
|
|
|
-from pathlib import Path
|
|
|
-import shutil
|
|
|
-
|
|
|
-class Command(BaseCommand):
|
|
|
- help = 'Migrate existing archives to content-addressable storage'
|
|
|
-
|
|
|
- def add_arguments(self, parser):
|
|
|
- parser.add_argument('--dry-run', action='store_true', help='Show what would be done')
|
|
|
- parser.add_argument('--views', nargs='+', default=['by_timestamp', 'by_domain', 'by_date'])
|
|
|
- parser.add_argument('--cleanup-legacy', action='store_true', help='Delete old files after migration')
|
|
|
- parser.add_argument('--batch-size', type=int, default=100)
|
|
|
-
|
|
|
- def handle(self, *args, **options):
|
|
|
- dry_run = options['dry_run']
|
|
|
- views = options['views']
|
|
|
- cleanup = options['cleanup_legacy']
|
|
|
- batch_size = options['batch_size']
|
|
|
-
|
|
|
- snapshots = Snapshot.objects.all().order_by('created_at')
|
|
|
- total = snapshots.count()
|
|
|
-
|
|
|
- if dry_run:
|
|
|
- self.stdout.write(self.style.WARNING('DRY RUN - No changes will be made'))
|
|
|
-
|
|
|
- self.stdout.write(f"Found {total} snapshots to migrate")
|
|
|
-
|
|
|
- total_files = 0
|
|
|
- total_saved = 0
|
|
|
- total_bytes = 0
|
|
|
- error_count = 0
|
|
|
-
|
|
|
- for i, snapshot in enumerate(snapshots, 1):
|
|
|
- self.stdout.write(f"\n[{i}/{total}] Processing {snapshot.url[:60]}...")
|
|
|
-
|
|
|
- legacy_dir = CONSTANTS.ARCHIVE_DIR / snapshot.timestamp
|
|
|
-
|
|
|
- if not legacy_dir.exists():
|
|
|
- self.stdout.write(f" Skipping (no legacy dir)")
|
|
|
- continue
|
|
|
-
|
|
|
- # Process each extractor directory
|
|
|
- for extractor_dir in legacy_dir.iterdir():
|
|
|
- if not extractor_dir.is_dir():
|
|
|
- continue
|
|
|
-
|
|
|
- extractor = extractor_dir.name
|
|
|
- self.stdout.write(f" Processing extractor: {extractor}")
|
|
|
-
|
|
|
- if dry_run:
|
|
|
- file_count = sum(1 for _ in extractor_dir.rglob('*') if _.is_file())
|
|
|
- self.stdout.write(f" Would ingest {file_count} files")
|
|
|
- continue
|
|
|
-
|
|
|
- # Track blobs before ingestion
|
|
|
- blobs_before = Blob.objects.count()
|
|
|
-
|
|
|
- try:
|
|
|
- # Ingest all files from this extractor
|
|
|
- ingested = BlobManager.ingest_directory(
|
|
|
- extractor_dir,
|
|
|
- snapshot,
|
|
|
- extractor
|
|
|
- )
|
|
|
-
|
|
|
- total_files += len(ingested)
|
|
|
-
|
|
|
- # Calculate deduplication savings
|
|
|
- blobs_after = Blob.objects.count()
|
|
|
- new_blobs = blobs_after - blobs_before
|
|
|
- dedup_count = len(ingested) - new_blobs
|
|
|
-
|
|
|
- if dedup_count > 0:
|
|
|
- dedup_bytes = sum(f.blob.size for f in ingested[-dedup_count:])
|
|
|
- total_saved += dedup_bytes
|
|
|
- self.stdout.write(
|
|
|
- f" ✓ Ingested {len(ingested)} files "
|
|
|
- f"({new_blobs} new, {dedup_count} deduplicated, "
|
|
|
- f"saved {dedup_bytes / 1024 / 1024:.1f} MB)"
|
|
|
- )
|
|
|
- else:
|
|
|
- total_bytes_added = sum(f.blob.size for f in ingested)
|
|
|
- total_bytes += total_bytes_added
|
|
|
- self.stdout.write(
|
|
|
- f" ✓ Ingested {len(ingested)} files "
|
|
|
- f"({total_bytes_added / 1024 / 1024:.1f} MB)"
|
|
|
- )
|
|
|
-
|
|
|
- except Exception as e:
|
|
|
- error_count += 1
|
|
|
- self.stdout.write(self.style.ERROR(f" ✗ Error: {e}"))
|
|
|
- continue
|
|
|
-
|
|
|
- # Cleanup legacy files
|
|
|
- if cleanup and not dry_run:
|
|
|
- try:
|
|
|
- shutil.rmtree(legacy_dir)
|
|
|
- self.stdout.write(f" Cleaned up legacy dir: {legacy_dir}")
|
|
|
- except Exception as e:
|
|
|
- self.stdout.write(self.style.WARNING(f" Failed to cleanup: {e}"))
|
|
|
-
|
|
|
- # Progress update
|
|
|
- if i % 10 == 0:
|
|
|
- self.stdout.write(
|
|
|
- f"\nProgress: {i}/{total} | "
|
|
|
- f"Files: {total_files:,} | "
|
|
|
- f"Saved: {total_saved / 1024 / 1024:.1f} MB | "
|
|
|
- f"Errors: {error_count}"
|
|
|
- )
|
|
|
-
|
|
|
- # Final summary
|
|
|
- self.stdout.write("\n" + "="*80)
|
|
|
- self.stdout.write(self.style.SUCCESS("Migration Complete!"))
|
|
|
- self.stdout.write(f" Snapshots processed: {total}")
|
|
|
- self.stdout.write(f" Files ingested: {total_files:,}")
|
|
|
- self.stdout.write(f" Space saved by deduplication: {total_saved / 1024 / 1024:.1f} MB")
|
|
|
- self.stdout.write(f" Errors: {error_count}")
|
|
|
- self.stdout.write(f" Symlink views created: {', '.join(views)}")
|
|
|
-```
|
|
|
-
|
|
|
-### Rebuild Views Command
|
|
|
-
|
|
|
-```python
|
|
|
-# archivebox/core/management/commands/rebuild_views.py
|
|
|
-
|
|
|
-from django.core.management.base import BaseCommand
|
|
|
-from core.models import SnapshotFile
|
|
|
-from storage.views import ViewManager
|
|
|
-import shutil
|
|
|
-
|
|
|
-class Command(BaseCommand):
|
|
|
- help = 'Rebuild symlink farm views from database'
|
|
|
-
|
|
|
- def add_arguments(self, parser):
|
|
|
- parser.add_argument(
|
|
|
- '--views',
|
|
|
- nargs='+',
|
|
|
- default=['by_timestamp', 'by_domain', 'by_date'],
|
|
|
- help='Which views to rebuild'
|
|
|
- )
|
|
|
- parser.add_argument(
|
|
|
- '--clean',
|
|
|
- action='store_true',
|
|
|
- help='Remove old symlinks before rebuilding'
|
|
|
- )
|
|
|
-
|
|
|
- def handle(self, *args, **options):
|
|
|
- views = options['views']
|
|
|
- clean = options['clean']
|
|
|
-
|
|
|
- # Clean old views
|
|
|
- if clean:
|
|
|
- self.stdout.write("Cleaning old views...")
|
|
|
- for view_name in views:
|
|
|
- view_dir = CONSTANTS.ARCHIVE_DIR / view_name
|
|
|
- if view_dir.exists():
|
|
|
- shutil.rmtree(view_dir)
|
|
|
- self.stdout.write(f" Removed {view_dir}")
|
|
|
-
|
|
|
- # Rebuild all symlinks
|
|
|
- total_symlinks = 0
|
|
|
- total_files = SnapshotFile.objects.count()
|
|
|
-
|
|
|
- self.stdout.write(f"Rebuilding symlinks for {total_files:,} files...")
|
|
|
-
|
|
|
- for i, snapshot_file in enumerate(
|
|
|
- SnapshotFile.objects.select_related('snapshot', 'blob'),
|
|
|
- 1
|
|
|
- ):
|
|
|
- try:
|
|
|
- created = ViewManager.create_symlinks(snapshot_file, views=views)
|
|
|
- total_symlinks += len(created)
|
|
|
- except Exception as e:
|
|
|
- self.stdout.write(self.style.ERROR(
|
|
|
- f"Failed to create symlinks for {snapshot_file}: {e}"
|
|
|
- ))
|
|
|
-
|
|
|
- if i % 1000 == 0:
|
|
|
- self.stdout.write(f" Created {total_symlinks:,} symlinks...")
|
|
|
-
|
|
|
- self.stdout.write(
|
|
|
- self.style.SUCCESS(
|
|
|
- f"\n✓ Rebuilt {total_symlinks:,} symlinks across {len(views)} views"
|
|
|
- )
|
|
|
- )
|
|
|
-```
|
|
|
-
|
|
|
-## Verification and Repair
|
|
|
-
|
|
|
-### Storage Verification Command
|
|
|
-
|
|
|
-```python
|
|
|
-# archivebox/core/management/commands/verify_storage.py
|
|
|
-
|
|
|
-from django.core.management.base import BaseCommand
|
|
|
-from core.models import SnapshotFile, Blob
|
|
|
-from storage.views import ViewManager
|
|
|
-from pathlib import Path
|
|
|
-
|
|
|
-class Command(BaseCommand):
|
|
|
- help = 'Verify storage consistency between DB and filesystem'
|
|
|
-
|
|
|
- def add_arguments(self, parser):
|
|
|
- parser.add_argument('--fix', action='store_true', help='Fix issues found')
|
|
|
- parser.add_argument('--vacuum', action='store_true', help='Remove orphaned symlinks')
|
|
|
-
|
|
|
- def handle(self, *args, **options):
|
|
|
- fix = options['fix']
|
|
|
- vacuum = options['vacuum']
|
|
|
-
|
|
|
- issues = {
|
|
|
- 'missing_cas_files': [],
|
|
|
- 'missing_symlinks': [],
|
|
|
- 'incorrect_symlinks': [],
|
|
|
- 'orphaned_symlinks': [],
|
|
|
- 'orphaned_blobs': [],
|
|
|
- }
|
|
|
-
|
|
|
- self.stdout.write("Checking database → filesystem consistency...")
|
|
|
-
|
|
|
- # Check 1: Verify all blobs exist in CAS
|
|
|
- self.stdout.write("\n1. Verifying CAS files...")
|
|
|
- for blob in Blob.objects.all():
|
|
|
- cas_path = ViewManager.get_cas_path(blob)
|
|
|
- if not cas_path.exists():
|
|
|
- issues['missing_cas_files'].append(blob)
|
|
|
- self.stdout.write(self.style.ERROR(
|
|
|
- f"✗ Missing CAS file: {cas_path} (blob {blob.hash[:16]}...)"
|
|
|
- ))
|
|
|
-
|
|
|
- # Check 2: Verify all SnapshotFiles have correct symlinks
|
|
|
- self.stdout.write("\n2. Verifying symlinks...")
|
|
|
- total_files = SnapshotFile.objects.count()
|
|
|
-
|
|
|
- for i, sf in enumerate(SnapshotFile.objects.select_related('blob'), 1):
|
|
|
- if i % 100 == 0:
|
|
|
- self.stdout.write(f" Checked {i}/{total_files} files...")
|
|
|
-
|
|
|
- cas_path = ViewManager.get_cas_path(sf.blob)
|
|
|
-
|
|
|
- for view_name in STORAGE_CONFIG.ENABLED_VIEWS:
|
|
|
- view = ViewManager.VIEWS[view_name]
|
|
|
- view_path = view.get_view_path(sf)
|
|
|
-
|
|
|
- if not view_path.exists() and not view_path.is_symlink():
|
|
|
- issues['missing_symlinks'].append((sf, view_name, view_path))
|
|
|
-
|
|
|
- if fix:
|
|
|
- try:
|
|
|
- ViewManager.create_symlinks_idempotent(sf, [view_name])
|
|
|
- self.stdout.write(self.style.SUCCESS(
|
|
|
- f"✓ Created missing symlink: {view_path}"
|
|
|
- ))
|
|
|
- except Exception as e:
|
|
|
- self.stdout.write(self.style.ERROR(
|
|
|
- f"✗ Failed to create symlink: {e}"
|
|
|
- ))
|
|
|
-
|
|
|
- elif view_path.is_symlink():
|
|
|
- # Verify symlink points to correct CAS file
|
|
|
- try:
|
|
|
- current_target = view_path.resolve()
|
|
|
- if current_target != cas_path:
|
|
|
- issues['incorrect_symlinks'].append((sf, view_name, view_path))
|
|
|
-
|
|
|
- if fix:
|
|
|
- ViewManager.create_symlinks_idempotent(sf, [view_name])
|
|
|
- self.stdout.write(self.style.SUCCESS(
|
|
|
- f"✓ Fixed incorrect symlink: {view_path}"
|
|
|
- ))
|
|
|
- except Exception as e:
|
|
|
- self.stdout.write(self.style.ERROR(
|
|
|
- f"✗ Broken symlink: {view_path} - {e}"
|
|
|
- ))
|
|
|
-
|
|
|
- # Check 3: Find orphaned symlinks
|
|
|
- if vacuum:
|
|
|
- self.stdout.write("\n3. Checking for orphaned symlinks...")
|
|
|
-
|
|
|
- # Get all valid view paths from DB
|
|
|
- valid_paths = set()
|
|
|
- for sf in SnapshotFile.objects.all():
|
|
|
- for view_name in STORAGE_CONFIG.ENABLED_VIEWS:
|
|
|
- view = ViewManager.VIEWS[view_name]
|
|
|
- valid_paths.add(view.get_view_path(sf))
|
|
|
-
|
|
|
- # Scan filesystem for symlinks
|
|
|
- for view_name in STORAGE_CONFIG.ENABLED_VIEWS:
|
|
|
- view_base = CONSTANTS.ARCHIVE_DIR / view_name
|
|
|
- if not view_base.exists():
|
|
|
- continue
|
|
|
-
|
|
|
- for path in view_base.rglob('*'):
|
|
|
- if path.is_symlink() and path not in valid_paths:
|
|
|
- issues['orphaned_symlinks'].append(path)
|
|
|
-
|
|
|
- if fix:
|
|
|
- path.unlink()
|
|
|
- self.stdout.write(self.style.SUCCESS(
|
|
|
- f"✓ Removed orphaned symlink: {path}"
|
|
|
- ))
|
|
|
-
|
|
|
- # Check 4: Find orphaned blobs
|
|
|
- self.stdout.write("\n4. Checking for orphaned blobs...")
|
|
|
- orphaned_blobs = Blob.objects.filter(ref_count=0)
|
|
|
-
|
|
|
- for blob in orphaned_blobs:
|
|
|
- issues['orphaned_blobs'].append(blob)
|
|
|
-
|
|
|
- if fix:
|
|
|
- cas_path = ViewManager.get_cas_path(blob)
|
|
|
- if cas_path.exists():
|
|
|
- cas_path.unlink()
|
|
|
- blob.delete()
|
|
|
- self.stdout.write(self.style.SUCCESS(
|
|
|
- f"✓ Removed orphaned blob: {blob.hash[:16]}..."
|
|
|
- ))
|
|
|
-
|
|
|
- # Summary
|
|
|
- self.stdout.write("\n" + "="*80)
|
|
|
- self.stdout.write(self.style.WARNING("Storage Verification Summary:"))
|
|
|
- self.stdout.write(f" Missing CAS files: {len(issues['missing_cas_files'])}")
|
|
|
- self.stdout.write(f" Missing symlinks: {len(issues['missing_symlinks'])}")
|
|
|
- self.stdout.write(f" Incorrect symlinks: {len(issues['incorrect_symlinks'])}")
|
|
|
- self.stdout.write(f" Orphaned symlinks: {len(issues['orphaned_symlinks'])}")
|
|
|
- self.stdout.write(f" Orphaned blobs: {len(issues['orphaned_blobs'])}")
|
|
|
-
|
|
|
- total_issues = sum(len(v) for v in issues.values())
|
|
|
-
|
|
|
- if total_issues == 0:
|
|
|
- self.stdout.write(self.style.SUCCESS("\n✓ Storage is consistent!"))
|
|
|
- elif fix:
|
|
|
- self.stdout.write(self.style.SUCCESS(f"\n✓ Fixed {total_issues} issues"))
|
|
|
- else:
|
|
|
- self.stdout.write(self.style.WARNING(
|
|
|
- f"\n⚠ Found {total_issues} issues. Run with --fix to repair."
|
|
|
- ))
|
|
|
-```
|
|
|
-
|
|
|
-## Configuration
|
|
|
-
|
|
|
-```python
|
|
|
-# archivebox/config/common.py
|
|
|
-
|
|
|
-class StorageConfig(BaseConfigSet):
|
|
|
- toml_section_header: str = "STORAGE_CONFIG"
|
|
|
-
|
|
|
- # Existing fields
|
|
|
- TMP_DIR: Path = Field(default=CONSTANTS.DEFAULT_TMP_DIR)
|
|
|
- LIB_DIR: Path = Field(default=CONSTANTS.DEFAULT_LIB_DIR)
|
|
|
- OUTPUT_PERMISSIONS: str = Field(default="644")
|
|
|
- RESTRICT_FILE_NAMES: str = Field(default="windows")
|
|
|
- ENFORCE_ATOMIC_WRITES: bool = Field(default=True)
|
|
|
- DIR_OUTPUT_PERMISSIONS: str = Field(default="755")
|
|
|
-
|
|
|
- # New CAS fields
|
|
|
- USE_CAS: bool = Field(
|
|
|
- default=True,
|
|
|
- description="Use content-addressable storage with deduplication"
|
|
|
- )
|
|
|
-
|
|
|
- ENABLED_VIEWS: list[str] = Field(
|
|
|
- default=['by_timestamp', 'by_domain', 'by_date'],
|
|
|
- description="Which symlink farm views to maintain"
|
|
|
- )
|
|
|
-
|
|
|
- AUTO_SYNC_SYMLINKS: bool = Field(
|
|
|
- default=True,
|
|
|
- description="Automatically create/update symlinks via signals"
|
|
|
- )
|
|
|
-
|
|
|
- VERIFY_ON_STARTUP: bool = Field(
|
|
|
- default=False,
|
|
|
- description="Verify storage consistency on startup"
|
|
|
- )
|
|
|
-
|
|
|
- VERIFY_INTERVAL_HOURS: int = Field(
|
|
|
- default=24,
|
|
|
- description="Run periodic storage verification (0 to disable)"
|
|
|
- )
|
|
|
-
|
|
|
- CLEANUP_TEMP_FILES: bool = Field(
|
|
|
- default=True,
|
|
|
- description="Remove temporary extractor files after ingestion"
|
|
|
- )
|
|
|
-
|
|
|
- CAS_BACKEND: str = Field(
|
|
|
- default='local',
|
|
|
- choices=['local', 's3', 'azure', 'gcs'],
|
|
|
- description="Storage backend for CAS blobs"
|
|
|
- )
|
|
|
-```
|
|
|
-
|
|
|
-## Workflow Examples
|
|
|
-
|
|
|
-### Example 1: Normal Operation
|
|
|
-
|
|
|
-```python
|
|
|
-# Extractor writes files to temporary directory
|
|
|
-extractor_dir = Path('/tmp/wget-output')
|
|
|
-
|
|
|
-# After extraction completes, ingest into CAS
|
|
|
-from storage.ingest import BlobManager
|
|
|
-
|
|
|
-ingested_files = BlobManager.ingest_directory(
|
|
|
- extractor_dir,
|
|
|
- snapshot,
|
|
|
- 'wget'
|
|
|
-)
|
|
|
-
|
|
|
-# Behind the scenes:
|
|
|
-# 1. Each file hashed (SHA-256)
|
|
|
-# 2. Blob created/found in DB (deduplication)
|
|
|
-# 3. File stored in CAS (if new)
|
|
|
-# 4. SnapshotFile created in DB
|
|
|
-# 5. post_save signal fires
|
|
|
-# 6. Symlinks automatically created in all enabled views
|
|
|
-# ✓ DB and filesystem in perfect sync
|
|
|
-```
|
|
|
-
|
|
|
-### Example 2: Browse Archives
|
|
|
-
|
|
|
-```bash
|
|
|
-# User can browse in multiple ways:
|
|
|
-
|
|
|
-# By domain (great for site collections)
|
|
|
-$ ls /data/archive/by_domain/example.com/20241225/
|
|
|
-019b54ee-28d9-72dc/
|
|
|
-
|
|
|
-# By date (great for time-based browsing)
|
|
|
-$ ls /data/archive/by_date/20241225/
|
|
|
-example.com/
|
|
|
-github.com/
|
|
|
-wikipedia.org/
|
|
|
-
|
|
|
-# By user (great for multi-user setups)
|
|
|
-$ ls /data/archive/by_user/squash/20241225/
|
|
|
-example.com/
|
|
|
-github.com/
|
|
|
-
|
|
|
-# Legacy timestamp (backwards compatibility)
|
|
|
-$ ls /data/archive/by_timestamp/1735142400.123/
|
|
|
-wget/
|
|
|
-singlefile/
|
|
|
-screenshot/
|
|
|
-```
|
|
|
-
|
|
|
-### Example 3: Crash Recovery
|
|
|
-
|
|
|
-```python
|
|
|
-# System crashes after DB save but before symlinks created
|
|
|
-# - DB has SnapshotFile record ✓
|
|
|
-# - Symlinks missing ✗
|
|
|
-
|
|
|
-# Next verification run:
|
|
|
-$ python -m archivebox verify_storage --fix
|
|
|
-
|
|
|
-# Output:
|
|
|
-# Checking database → filesystem consistency...
|
|
|
-# ✗ Missing symlink: /data/archive/by_domain/example.com/.../index.html
|
|
|
-# ✓ Created missing symlink
|
|
|
-# ✓ Fixed 1 issues
|
|
|
-
|
|
|
-# Storage is now consistent!
|
|
|
-```
|
|
|
-
|
|
|
-### Example 4: Migration from Legacy
|
|
|
-
|
|
|
-```bash
|
|
|
-# Migrate all existing archives to CAS
|
|
|
-$ python -m archivebox migrate_to_cas --dry-run
|
|
|
-
|
|
|
-# Output:
|
|
|
-# DRY RUN - No changes will be made
|
|
|
-# Found 1000 snapshots to migrate
|
|
|
-# [1/1000] Processing https://example.com...
|
|
|
-# Would ingest wget: 15 files
|
|
|
-# Would ingest singlefile: 1 file
|
|
|
-# ...
|
|
|
-
|
|
|
-# Run actual migration
|
|
|
-$ python -m archivebox migrate_to_cas
|
|
|
-
|
|
|
-# Output:
|
|
|
-# [1/1000] Processing https://example.com...
|
|
|
-# ✓ Ingested 15 files (3 new, 12 deduplicated, saved 2.4 MB)
|
|
|
-# ...
|
|
|
-# Migration Complete!
|
|
|
-# Snapshots processed: 1000
|
|
|
-# Files ingested: 45,231
|
|
|
-# Space saved by deduplication: 12.3 GB
|
|
|
-```
|
|
|
-
|
|
|
-## Benefits
|
|
|
-
|
|
|
-### Space Savings
|
|
|
-- **Massive deduplication**: Common files (jquery, fonts, images) stored once
|
|
|
-- **30-70% typical savings** across archives
|
|
|
-- **Symlink overhead**: ~0.1% of saved space (negligible)
|
|
|
-
|
|
|
-### Flexibility
|
|
|
-- **Multiple views**: Browse by domain, date, user, timestamp
|
|
|
-- **Add views anytime**: Run `rebuild_views` to add new organization
|
|
|
-- **No data migration needed**: Just rebuild symlinks
|
|
|
-
|
|
|
-### S3 Support
|
|
|
-- **Use django-storages**: Drop-in S3, Azure, GCS support
|
|
|
-- **Hybrid mode**: Hot data local, cold data in S3
|
|
|
-- **Cost optimization**: S3 Intelligent Tiering for automatic cost reduction
|
|
|
-
|
|
|
-### Data Integrity
|
|
|
-- **Database as truth**: Symlinks are disposable, can be rebuilt
|
|
|
-- **Automatic sync**: Signals keep symlinks current
|
|
|
-- **Self-healing**: Verification detects and fixes drift
|
|
|
-- **Atomic operations**: Transaction-safe
|
|
|
-
|
|
|
-### Backwards Compatibility
|
|
|
-- **Legacy view**: `by_timestamp` maintains old structure
|
|
|
-- **Gradual migration**: Old and new archives coexist
|
|
|
-- **Zero downtime**: Archives keep working during migration
|
|
|
-
|
|
|
-### Developer Experience
|
|
|
-- **Human-browseable**: Easy to inspect and debug
|
|
|
-- **Standard tools work**: cp, rsync, tar, zip all work normally
|
|
|
-- **Multiple organization schemes**: Find archives multiple ways
|
|
|
-- **Easy backups**: Symlinks handled correctly by modern tools
|
|
|
-
|
|
|
-## Implementation Checklist
|
|
|
-
|
|
|
-- [ ] Create database models (Blob, SnapshotFile)
|
|
|
-- [ ] Create migrations for new models
|
|
|
-- [ ] Implement BlobManager (ingest.py)
|
|
|
-- [ ] Implement ViewManager (views.py)
|
|
|
-- [ ] Implement Django signals (signals.py)
|
|
|
-- [ ] Create migrate_to_cas command
|
|
|
-- [ ] Create rebuild_views command
|
|
|
-- [ ] Create verify_storage command
|
|
|
-- [ ] Update Snapshot.output_dir property
|
|
|
-- [ ] Update ArchiveResult to use SnapshotFile
|
|
|
-- [ ] Add StorageConfig settings
|
|
|
-- [ ] Configure django-storages
|
|
|
-- [ ] Test with local filesystem
|
|
|
-- [ ] Test with S3
|
|
|
-- [ ] Document for users
|
|
|
-- [ ] Update backup procedures
|
|
|
-
|
|
|
-## Future Enhancements
|
|
|
-
|
|
|
-- [ ] Web UI for browsing CAS blobs
|
|
|
-- [ ] API endpoints for file access
|
|
|
-- [ ] Content-aware compression (compress similar files together)
|
|
|
-- [ ] IPFS backend support
|
|
|
-- [ ] Automatic tiering (hot → warm → cold → glacier)
|
|
|
-- [ ] Deduplication statistics dashboard
|
|
|
-- [ ] Export to WARC with CAS metadata
|