alex
b69c098cab
- BackupEngine class executes jobs and creates backups - Automatic fallback from incremental to full if no parent exists - SHA-256 checksum calculation for integrity - Tests for full backup and incremental fallback
131 lines
4.7 KiB
Python
131 lines
4.7 KiB
Python
import os
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import hashlib
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import shutil
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from datetime import datetime, timezone
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from pathlib import Path
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from typing import Optional
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from sqlalchemy.ext.asyncio import AsyncSession
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from sqlalchemy import select
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from app.models import Job, JobExecution, Backup
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from backup.adapters import get_adapter
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class BackupEngine:
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def __init__(self, db: AsyncSession):
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self.db = db
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async def execute_job(self, job_id: int, triggered_by: str = "manual") -> JobExecution:
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# Create execution record
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execution = JobExecution(
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job_id=job_id,
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status="pending",
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triggered_by=triggered_by
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)
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self.db.add(execution)
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await self.db.commit()
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await self.db.refresh(execution)
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try:
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# Load job with source
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result = await self.db.execute(
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select(Job).where(Job.id == job_id)
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)
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job = result.scalar_one()
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# Update status to running
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execution.status = "running"
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execution.started_at = datetime.now(timezone.utc)
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await self.db.commit()
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# Determine strategy
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strategy = job.strategy
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parent_backup_id = None
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if strategy == "incremental":
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# Find last successful full backup
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result = await self.db.execute(
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select(Backup)
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.join(JobExecution)
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.where(
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JobExecution.job_id == job_id,
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JobExecution.status == "success",
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Backup.type == "full"
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)
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.order_by(Backup.created_at.desc())
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)
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last_full = result.scalar_one_or_none()
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if last_full:
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parent_backup_id = last_full.id
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else:
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# No full backup exists, do full instead
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strategy = "full"
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# Create backup directory
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timestamp = datetime.now(timezone.utc).strftime("%Y-%m-%d_%H%M%S")
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backup_dir = Path(job.destination_path) / str(job_id) / f"{timestamp}_{strategy}"
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backup_dir.mkdir(parents=True, exist_ok=True)
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# Get adapter and connect
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adapter = get_adapter(job.source.type, job.source.config)
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await adapter.connect()
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try:
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# Copy files
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total_processed = 0
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total_backed_up = 0
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source_path = Path(job.source.config.get("path", "."))
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for item in source_path.rglob("*"):
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if item.is_file():
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rel_path = item.relative_to(source_path)
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dest_path = backup_dir / "data" / rel_path
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dest_path.parent.mkdir(parents=True, exist_ok=True)
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# Copy file
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shutil.copy2(item, dest_path)
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size = item.stat().st_size
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total_processed += size
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total_backed_up += size
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# Calculate checksum
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checksum = await self._calculate_checksum(backup_dir)
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# Create backup record
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backup = Backup(
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execution_id=execution.id,
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storage_path=str(backup_dir),
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size_bytes=total_backed_up,
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checksum=checksum,
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type=strategy,
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parent_backup_id=parent_backup_id
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)
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self.db.add(backup)
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# Update execution
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execution.status = "success"
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execution.completed_at = datetime.now(timezone.utc)
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execution.bytes_processed = total_processed
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execution.bytes_backed_up = total_backed_up
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finally:
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await adapter.disconnect()
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except Exception as e:
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execution.status = "failed"
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execution.completed_at = datetime.now(timezone.utc)
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execution.error_message = str(e)
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await self.db.commit()
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return execution
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async def _calculate_checksum(self, path: Path) -> str:
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hasher = hashlib.sha256()
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for item in sorted(path.rglob("*")):
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if item.is_file():
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with open(item, "rb") as f:
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while chunk := f.read(8192):
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hasher.update(chunk)
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return hasher.hexdigest()
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