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Help to recover from corrupted levelqueue (#24912)
gitea.com experienced the corrupted LevelQueue bug again. I think the problem is clear now: if the keys in LevelDB went out-of-sync, the LevelQueue itself doesn't have the ability to recover, eg: * LevelQueue.Len() reports 100 * LevelQueue.LPop() reports ErrNotFound = errors.New("no key found") So it needs to dive into the LevelDB to remove all keys to recover the corrupted LevelQueue. More comments are in TestCorruptedLevelQueue.pull/24963/head^2
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// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package lqinternal |
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import ( |
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"bytes" |
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"encoding/binary" |
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"github.com/syndtr/goleveldb/leveldb" |
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"github.com/syndtr/goleveldb/leveldb/opt" |
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) |
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func QueueItemIDBytes(id int64) []byte { |
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buf := make([]byte, 8) |
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binary.PutVarint(buf, id) |
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return buf |
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} |
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func QueueItemKeyBytes(prefix []byte, id int64) []byte { |
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key := make([]byte, len(prefix), len(prefix)+1+8) |
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copy(key, prefix) |
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key = append(key, '-') |
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return append(key, QueueItemIDBytes(id)...) |
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} |
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func RemoveLevelQueueKeys(db *leveldb.DB, namePrefix []byte) { |
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keyPrefix := make([]byte, len(namePrefix)+1) |
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copy(keyPrefix, namePrefix) |
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keyPrefix[len(namePrefix)] = '-' |
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it := db.NewIterator(nil, &opt.ReadOptions{Strict: opt.NoStrict}) |
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defer it.Release() |
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for it.Next() { |
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if bytes.HasPrefix(it.Key(), keyPrefix) { |
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_ = db.Delete(it.Key(), nil) |
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} |
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} |
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} |
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func ListLevelQueueKeys(db *leveldb.DB) (res [][]byte) { |
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it := db.NewIterator(nil, &opt.ReadOptions{Strict: opt.NoStrict}) |
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defer it.Release() |
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for it.Next() { |
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res = append(res, it.Key()) |
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} |
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return res |
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} |
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