A restore could load a database dump whose schema was older than the running code. The manifest stamped schemarev from the code image on disk, so the compatibility check compared the code against itself and always passed. A set captured from a database at 7d37_import_batches_and_journal restored under code at 7d41_drop_guest_tools_secrets, leaving the data behind the code: every query on a table the newer migrations touched failed with 1054 Unknown column, which surfaced as empty configuration-policy dropdowns and a failure to load data on edit PC. The authoritative signal is the alembic_version of the database that was dumped, so manifests now carry datarev alongside schemarev, backup.sh reads it from the database and warns when it has drifted from the image, and the gate asks whether the running code knows that revision. Data behind the code is allowed because it can be rolled forward; data ahead of the code is refused because it cannot. Rolling it forward has to happen somewhere with an app context. The backup sidecar is mysql plus restic plus alembic only and has no Flask, so restore.sh loads the dump and parks the run in an upgrading phase behind an .upgrade-requested sentinel rather than declaring a success it cannot verify. The api container owns the Flask CLI and already runs these exact idempotent commands on every deploy, so a finalize endpoint there runs db upgrade plus plugin upgrade-all and stamps the terminal phase. The UI drives it on seeing the upgrading phase, so recovery needs no operator intervention. The live simulation runs one codebase against itself, so its dump is always at the same revision as the code restoring it and it can never reproduce this drift. The gate therefore gets a standalone tester that builds throwaway migration chains and dumps offline, invoked as a simulation preflight. It caught a real bug in the legacy dump-parse fallback, where the revision was matched loosely enough to return the alembic_version table name instead of the value it holds.
591 lines
23 KiB
Python
591 lines
23 KiB
Python
"""Backups API routes.
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Admin-only surface over the site's backup sets. The heavy lifting (mysqldump,
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restic snapshot of the instance tree, retention prune, integrity check) runs in
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the one-shot backup container defined in docker-compose.backup.yml; this
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blueprint is the read-mostly control plane the UI talks to.
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Two recovery products stay firewalled, per the design notes:
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- code rollback lives in git (tags/releases), NOT here
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- data restore lives here, gated on schema compatibility via each set's manifest
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Every backup set carries a manifest.json stamped with the core + plugin Alembic
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revisions and the running image tag at capture time. A restore is a CHECKED
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operation: current code must be at least the set's schema revision, so we never
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load rows that reference a column the live schema has not applied yet.
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"""
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import json
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import os
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import subprocess
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from datetime import datetime, timezone
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from flask import Blueprint, current_app, request
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from shopdb.core.models import AuditLog
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from shopdb.core.models.setting import Setting
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from shopdb.utils.responses import success_response, error_response, ErrorCodes
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from shopdb.utils.authz import require_role
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shopdbbackups_bp = Blueprint('shopdbbackups', __name__)
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# Supported backup destination kinds. 'local' needs no credentials; 'smb' and
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# 'aws' are ground-wired here so operators can configure them now, but their
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# client libraries are held back until the security review clears them, so the
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# runner treats a non-local destination as configured-but-not-yet-armed.
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DESTINATION_KINDS = ('local', 'smb', 'aws')
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# The setting keys that make up each destination's config, grouped by kind so
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# the GET can surface only the relevant fields and the PUT can validate what it
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# is allowed to write. Secret keys (password/secret/token in the name) are
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# masked by the shared settings serializer, same convention as SMTP/SAML.
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DESTINATION_FIELDS = {
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'local': [],
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'smb': [
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'backup_smb_host',
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'backup_smb_share',
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'backup_smb_path',
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'backup_smb_username',
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'backup_smb_password',
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],
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'aws': [
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'backup_aws_region',
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'backup_aws_bucket',
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'backup_aws_prefix',
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'backup_aws_accesskeyid',
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'backup_aws_secretaccesskey',
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],
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}
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# Keys whose value must never leave the API in the clear. Mirrors the shared
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# settings convention (_is_secret) so the two surfaces agree on what is secret.
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_SECRET_TOKENS = ('password', 'secret', 'token')
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SECRET_MASK = '********'
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def _is_secret_key(key):
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return any(token in key for token in _SECRET_TOKENS)
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# Where the backup container drops each set and its manifest. Mounted read-only
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# for the api container so the UI can enumerate sets without being able to
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# mutate them; writes happen only from the backup one-shot.
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BACKUPS_ROOT_ENV = 'SHOPDB_BACKUPS_ROOT'
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DEFAULT_BACKUPS_ROOT = '/backups'
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# Retention the backup container enforces; surfaced read-only so the UI can show
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# "day 1 of 5 retained" without re-deriving the policy.
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RETENTION = {
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'keepdaily': 5,
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'keepweekly': 4,
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'keepmonthly': 6,
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}
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def _backups_root():
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return os.environ.get(BACKUPS_ROOT_ENV, DEFAULT_BACKUPS_ROOT)
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def _read_json(path):
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"""Load a JSON file, or None when it is absent or unreadable."""
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try:
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with open(path, 'r', encoding='utf-8') as handle:
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return json.load(handle)
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except (OSError, ValueError):
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return None
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def _read_status(kind):
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"""Return the live status dict for a run kind, or None when idle."""
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root = _backups_root()
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return _read_json(os.path.join(root, '.' + kind + '-status.json'))
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def _read_history(kind):
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"""Return the recorded run history for a kind, newest first."""
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root = _backups_root()
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entries = _read_json(os.path.join(root, 'history', kind + 's.json'))
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if not isinstance(entries, list):
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return []
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return list(reversed(entries))
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def _write_status(kind, phase, setname, message):
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"""Seed a live status file so the UI shows movement the instant a run is
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queued, before the watcher has picked up the sentinel."""
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root = _backups_root()
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stamp = datetime.now(timezone.utc).replace(tzinfo=None).isoformat() + 'Z'
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payload = {
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'kind': kind,
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'phase': phase,
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'setname': setname,
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'message': message,
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'updatedat': stamp,
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}
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try:
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path = os.path.join(root, '.' + kind + '-status.json')
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with open(path, 'w', encoding='utf-8') as handle:
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json.dump(payload, handle)
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except OSError:
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pass
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def _append_history(kind, outcome, setname, message):
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"""Append one run record to the shared history the UI reads, newest last.
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Mirrors status.sh's history_append so a finalize that completes in the api
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(not the sidecar) still lands in the same history file the restore page
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shows. Best-effort: history is a convenience log, never a gate.
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"""
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root = _backups_root()
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stamp = datetime.now(timezone.utc).replace(tzinfo=None).isoformat() + 'Z'
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entry = {
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'kind': kind,
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'outcome': outcome,
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'setname': setname,
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'message': message,
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'at': stamp,
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}
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path = os.path.join(root, 'history', kind + 's.json')
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try:
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os.makedirs(os.path.dirname(path), exist_ok=True)
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entries = _read_json(path)
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if not isinstance(entries, list):
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entries = []
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entries.append(entry)
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with open(path, 'w', encoding='utf-8') as handle:
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json.dump(entries, handle)
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except OSError:
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pass
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def _run_schema_upgrade():
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"""Bring the just-restored database up to the running code, in-process.
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Runs the same two idempotent steps every deploy runs: the core Alembic
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upgrade to head, then each plugin chain via the plugin manager. Both are
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no-ops when the data already matches the code head, so this is safe to call
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even when the restored dump was already current. Uses the live app context
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and its configured engine, so no subprocess or extra Flask CLI is needed.
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"""
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from flask_migrate import upgrade as alembic_upgrade
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alembic_upgrade()
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manager = current_app.extensions.get('plugin_manager')
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if manager is None:
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raise RuntimeError('Plugin manager not initialized; cannot upgrade plugins')
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results = manager.upgrade_all_plugins()
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failed = {name: status for name, status in (results or {}).items()
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if status not in ('ok', 'no-migrations')}
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if failed:
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raise RuntimeError('Plugin upgrade failed: ' + json.dumps(failed))
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def _read_manifest(setdir):
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"""Load a set's manifest.json, or None when absent/unreadable.
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A set without a readable manifest is not restorable (we cannot check its
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schema), so callers treat None as "unverified" rather than trusting it.
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"""
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path = os.path.join(setdir, 'manifest.json')
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try:
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with open(path, 'r', encoding='utf-8') as handle:
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return json.load(handle)
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except (OSError, ValueError):
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return None
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def _current_schema_revisions():
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"""Return the live Alembic head revisions (core + plugins) for this build.
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Compared against a set's stamped revisions to decide restore compatibility.
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Imported lazily so a missing alembic at request time degrades to an empty
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map (everything reads as "unknown") instead of 500ing the list endpoint.
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"""
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try:
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from alembic.config import Config
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from alembic.script import ScriptDirectory
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except ImportError:
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return {}
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root = current_app.root_path
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migrations = os.path.join(os.path.dirname(root), 'migrations')
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ini = os.path.join(migrations, 'alembic.ini')
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if not os.path.isfile(ini):
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return {}
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try:
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config = Config(ini)
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# This is a Flask-Migrate project: alembic.ini carries no
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# script_location (it is set at runtime), so ScriptDirectory.from_config
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# would raise and leave every set reading as incompatible. Point it at
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# the migrations directory - the same versions tree manifest.py scans.
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config.set_main_option('script_location', migrations)
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script = ScriptDirectory.from_config(config)
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return {'core': list(script.get_heads())}
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except Exception:
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return {}
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def _known_core_revisions():
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"""Return every core Alembic revision this build knows, heads and ancestors.
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Restore compatibility is now data-driven: a set restores when the running
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code KNOWS the dump's data revision (so `flask db upgrade` can roll it
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forward to head). Heads alone cannot answer that - a dump stamped at an
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older-but-valid revision is perfectly restorable - so we walk the whole
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script history. Lazy import + broad except keeps a missing/broken alembic
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from 500ing the list endpoint (returns empty = everything reads unknown).
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"""
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try:
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from alembic.config import Config
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from alembic.script import ScriptDirectory
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except ImportError:
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return set()
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root = current_app.root_path
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migrations = os.path.join(os.path.dirname(root), 'migrations')
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ini = os.path.join(migrations, 'alembic.ini')
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if not os.path.isfile(ini):
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return set()
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try:
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config = Config(ini)
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config.set_main_option('script_location', migrations)
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script = ScriptDirectory.from_config(config)
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return {rev.revision for rev in script.walk_revisions()}
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except Exception:
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return set()
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def _is_compatible(manifest, current):
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"""Decide whether a set restores onto THIS build.
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Data-driven gate (the fix for the FBJXBDB4 outage): the authoritative
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signal is the set's `datarev` - the actual `alembic_version` of the dumped
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DATABASE, not the code head that captured it. A restore is safe when the
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running code KNOWS that revision (it is somewhere in this build's migration
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history), because then the post-restore finalize can run `flask db upgrade`
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to roll the loaded data forward to head. If the code does not know the
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revision, the dump is from a NEWER schema than this build and would 500 on
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restored rows, so we block until the code is upgraded.
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Legacy sets predate `datarev`; fall back to the old head-subset check on
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`schemarev` so they stay listable and restorable as before.
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"""
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if not manifest:
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return False
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datarev = manifest.get('datarev')
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if datarev:
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known = _known_core_revisions()
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if not known:
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return False
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return datarev in known
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setrevs = set(manifest.get('schemarev', {}).get('core', []))
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currevs = set(current.get('core', []))
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if not setrevs or not currevs:
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return False
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# Compatible when the current heads cover every head the set was taken at.
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return setrevs.issubset(currevs)
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# Reserved entries under the backups root that are not backup sets: the run
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# history store and any dotfile sentinels/status files the watcher drops.
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_NON_SET_ENTRIES = ('history',)
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def _list_sets():
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"""Enumerate backup sets newest-first, each summarized for the list view."""
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root = _backups_root()
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if not os.path.isdir(root):
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return []
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current = _current_schema_revisions()
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sets = []
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for name in sorted(os.listdir(root), reverse=True):
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if name in _NON_SET_ENTRIES or name.startswith('.'):
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continue
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setdir = os.path.join(root, name)
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if not os.path.isdir(setdir):
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continue
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manifest = _read_manifest(setdir)
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dbdump = os.path.join(setdir, 'db.sql.gz')
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sizebytes = 0
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for base, _dirs, files in os.walk(setdir):
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for filename in files:
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try:
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sizebytes += os.path.getsize(os.path.join(base, filename))
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except OSError:
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pass
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sets.append({
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'snapshotid': name,
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'takenat': (manifest or {}).get('takenat'),
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'sizebytes': sizebytes,
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'schemarev': (manifest or {}).get('schemarev', {}),
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'imagetag': (manifest or {}).get('imagetag'),
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'ischeckpassed': bool((manifest or {}).get('ischeckpassed')),
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'hasmanifest': manifest is not None,
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'hasdbdump': os.path.isfile(dbdump),
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'iscompatible': _is_compatible(manifest, current),
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})
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return sets
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@shopdbbackups_bp.route('', methods=['GET'])
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@require_role('admin')
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def list_backups():
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"""List every retained backup set, newest first, with a compatibility flag."""
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sets = _list_sets()
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laststgood = next((s for s in sets if s['ischeckpassed']), None)
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meta = {
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'retention': RETENTION,
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'lastgoodat': (laststgood or {}).get('takenat'),
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'count': len(sets),
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}
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return success_response(data=sets, meta=meta)
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@shopdbbackups_bp.route('/<snapshotid>', methods=['GET'])
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@require_role('admin')
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def get_backup(snapshotid):
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"""Return one set's full manifest plus a resolved compatibility verdict."""
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root = _backups_root()
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setdir = os.path.join(root, os.path.basename(snapshotid))
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if not os.path.isdir(setdir):
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return error_response(ErrorCodes.NOT_FOUND, 'Backup set not found',
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http_code=404)
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manifest = _read_manifest(setdir)
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current = _current_schema_revisions()
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return success_response(data={
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'snapshotid': os.path.basename(snapshotid),
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'manifest': manifest,
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'currentschemarev': current,
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'iscompatible': _is_compatible(manifest, current),
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'hasmanifest': manifest is not None,
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})
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@shopdbbackups_bp.route('', methods=['POST'])
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@require_role('admin')
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def trigger_backup():
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"""Kick off an on-demand backup run.
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The api container cannot run docker; it writes a sentinel the host-side
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scheduler (or an operator running `docker compose run --rm backup`) picks
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up. Returning isrunning=false with a clear message keeps the UI honest
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rather than pretending the run started inside this process.
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"""
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root = _backups_root()
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try:
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os.makedirs(root, exist_ok=True)
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sentinel = os.path.join(root, '.backup-requested')
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stamp = datetime.now(timezone.utc).replace(tzinfo=None).isoformat() + 'Z'
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with open(sentinel, 'w', encoding='utf-8') as handle:
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handle.write(stamp)
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except OSError as error:
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return error_response(ErrorCodes.INTERNAL_ERROR,
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'Could not queue a backup: ' + str(error),
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http_code=500)
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_write_status('backup', 'queued', '', 'Backup queued')
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AuditLog.log('requested', 'Backup', entityname=stamp)
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return success_response(
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data={'isrunning': False, 'isqueued': True, 'requestedat': stamp},
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message='Backup queued. The backup service runs it on its next pass.')
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@shopdbbackups_bp.route('/<snapshotid>/restore', methods=['POST'])
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@require_role('admin')
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def restore_backup(snapshotid):
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"""Queue a restore of a set, gated on schema compatibility.
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We refuse outright when the set is incompatible (current code older than the
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set's schema) so an operator cannot foot-gun a schema mismatch from the UI.
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The actual restore is performed by scripts/backup/restore.sh in the backup
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container; here we validate and record intent.
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"""
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root = _backups_root()
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setdir = os.path.join(root, os.path.basename(snapshotid))
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if not os.path.isdir(setdir):
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return error_response(ErrorCodes.NOT_FOUND, 'Backup set not found',
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http_code=404)
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manifest = _read_manifest(setdir)
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current = _current_schema_revisions()
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if not _is_compatible(manifest, current):
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return error_response(
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ErrorCodes.CONFLICT,
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'This backup was taken on a newer schema than the running code. '
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'Upgrade the code to at least the set\'s revision, run '
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'`flask db upgrade` and `flask plugin upgrade-all`, then retry.',
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details={'currentschemarev': current,
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'setschemarev': (manifest or {}).get('schemarev', {})},
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http_code=409)
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try:
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sentinel = os.path.join(root, '.restore-requested')
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stamp = datetime.now(timezone.utc).replace(tzinfo=None).isoformat() + 'Z'
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with open(sentinel, 'w', encoding='utf-8') as handle:
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handle.write(os.path.basename(snapshotid))
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except OSError as error:
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return error_response(ErrorCodes.INTERNAL_ERROR,
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'Could not queue the restore: ' + str(error),
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http_code=500)
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_write_status('restore', 'queued', os.path.basename(snapshotid),
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'Restore queued')
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AuditLog.log('restore-requested', 'Backup',
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entityname=os.path.basename(snapshotid))
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return success_response(
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data={'isqueued': True, 'snapshotid': os.path.basename(snapshotid)},
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message='Restore queued and validated against the live schema.')
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@shopdbbackups_bp.route('/finalize-restore', methods=['POST'])
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|
@require_role('admin')
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def finalize_restore():
|
|
"""Run the post-restore schema upgrade in the app context.
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|
|
The restore itself runs in the Flask-less backup sidecar, which loads the
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dump and then drops an .upgrade-requested sentinel because it cannot run
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|
'flask db upgrade' itself. This endpoint is the api-side half: it brings the
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|
just-restored DATA up to the running CODE with the exact idempotent commands
|
|
the deploy path uses, then stamps the final 'done'. Without it a restored
|
|
dump that sits at an older revision leaves every newer-migration table
|
|
throwing 1054 Unknown column.
|
|
|
|
Idempotent and safe to call when nothing is pending: if there is no
|
|
.upgrade-requested sentinel it reports there was nothing to finalize.
|
|
"""
|
|
root = _backups_root()
|
|
sentinel = os.path.join(root, '.upgrade-requested')
|
|
try:
|
|
with open(sentinel, 'r', encoding='utf-8') as handle:
|
|
setname = handle.read().strip()
|
|
except OSError:
|
|
return success_response(
|
|
data={'finalized': False},
|
|
message='No restore is awaiting schema upgrade.')
|
|
|
|
_write_status('restore', 'upgrading', setname,
|
|
'Upgrading restored schema to code')
|
|
try:
|
|
_run_schema_upgrade()
|
|
except Exception as error: # noqa: BLE001 - report any upgrade failure
|
|
_write_status('restore', 'failed', setname,
|
|
'Schema upgrade failed: ' + str(error))
|
|
_append_history('restore', 'failed', setname,
|
|
'Schema upgrade failed: ' + str(error))
|
|
return error_response(ErrorCodes.INTERNAL_ERROR,
|
|
'Post-restore schema upgrade failed: ' + str(error),
|
|
http_code=500)
|
|
|
|
try:
|
|
os.remove(sentinel)
|
|
except OSError:
|
|
pass
|
|
_write_status('restore', 'done', setname, 'Restore complete')
|
|
_append_history('restore', 'success', setname, 'Restore complete')
|
|
AuditLog.log('restore-finalized', 'Backup', entityname=setname)
|
|
return success_response(
|
|
data={'finalized': True, 'snapshotid': setname},
|
|
message='Restore finalized: schema upgraded to the running code.')
|
|
|
|
|
|
@shopdbbackups_bp.route('/status', methods=['GET'])
|
|
@require_role('admin')
|
|
def get_status():
|
|
"""Return the live status of the most recent backup and restore runs.
|
|
|
|
The watcher writes these files as it moves through each phase; the UI polls
|
|
this endpoint to drive the restore progress spinner and phase label. Either
|
|
value is None when that kind of run has never been requested.
|
|
"""
|
|
return success_response(data={
|
|
'backup': _read_status('backup'),
|
|
'restore': _read_status('restore'),
|
|
})
|
|
|
|
|
|
@shopdbbackups_bp.route('/history', methods=['GET'])
|
|
@require_role('admin')
|
|
def get_history():
|
|
"""Return the recorded history of backup and restore runs, newest first.
|
|
|
|
These are operational run logs written by the backup container onto the
|
|
shared volume, not the audit trail (AuditLog records the requested intent).
|
|
"""
|
|
return success_response(data={
|
|
'backups': _read_history('backup'),
|
|
'restores': _read_history('restore'),
|
|
})
|
|
|
|
|
|
@shopdbbackups_bp.route('/settings', methods=['GET'])
|
|
@require_role('admin')
|
|
def get_backup_settings():
|
|
"""Return destination + retention config for the settings pane.
|
|
|
|
The destination kind and its (non-secret) fields come from the settings
|
|
store so an operator can configure where backups ship without editing env
|
|
or redeploying. Secret fields (SMB password, AWS secret key) are never
|
|
returned in the clear: we send a mask when a value is set and an empty
|
|
string when it is not, matching the shared settings API convention.
|
|
|
|
'smb' and 'aws' are configurable now but their client libraries are held
|
|
back pending the security review, so we flag those destinations as armed:
|
|
false to tell the UI the config is stored but not yet acting.
|
|
"""
|
|
kind = Setting.get('backup_destination_kind', 'local')
|
|
if kind not in DESTINATION_KINDS:
|
|
kind = 'local'
|
|
|
|
fields = {}
|
|
for key in DESTINATION_FIELDS.get(kind, []):
|
|
raw = Setting.get(key, '')
|
|
if _is_secret_key(key):
|
|
fields[key] = SECRET_MASK if raw else ''
|
|
else:
|
|
fields[key] = raw or ''
|
|
|
|
return success_response(data={
|
|
'destinationkind': kind,
|
|
'destinationkinds': list(DESTINATION_KINDS),
|
|
'fields': fields,
|
|
'isarmed': kind == 'local',
|
|
'retention': RETENTION,
|
|
'backupsroot': _backups_root(),
|
|
})
|
|
|
|
|
|
@shopdbbackups_bp.route('/settings', methods=['PUT'])
|
|
@require_role('admin')
|
|
def update_backup_settings():
|
|
"""Persist the backup destination kind and its credential/config fields.
|
|
|
|
Only keys that belong to the chosen destination are accepted, so a stray
|
|
payload cannot write arbitrary settings rows through this surface. A secret
|
|
field submitted as the mask placeholder means "leave unchanged" - the
|
|
client only ever received the mask, so we never overwrite a real secret
|
|
with it.
|
|
"""
|
|
data = request.get_json(silent=True) or {}
|
|
kind = data.get('destinationkind', Setting.get('backup_destination_kind', 'local'))
|
|
if kind not in DESTINATION_KINDS:
|
|
return error_response(
|
|
ErrorCodes.VALIDATION_ERROR,
|
|
'destinationkind must be one of: ' + ', '.join(DESTINATION_KINDS))
|
|
|
|
Setting.set('backup_destination_kind', kind, valuetype='string',
|
|
category='backup')
|
|
|
|
incoming = data.get('fields', {}) or {}
|
|
allowed = set(DESTINATION_FIELDS.get(kind, []))
|
|
for key, value in incoming.items():
|
|
if key not in allowed:
|
|
continue
|
|
if _is_secret_key(key) and value == SECRET_MASK:
|
|
continue
|
|
Setting.set(key, value if value is not None else '',
|
|
valuetype='string', category='backup')
|
|
|
|
AuditLog.log('updated', 'BackupSettings', entityname=kind, changes={
|
|
'destinationkind': kind,
|
|
})
|
|
|
|
return get_backup_settings()
|