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47 lines
1.7 KiB
47 lines
1.7 KiB
1 year ago
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const { renameSync, unlinkSync } = require('fs')
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const { extname } = require('path')
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exports.upgrade = function(path, options, open) {
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let upgradeModule
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try {
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upgradeModule = require('lmdb-store-0.9')
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} catch (error) {
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throw new Error('And invalid file format was encountered in the database, if you have an older database, you need to install package lmdb-store-0.9 to upgrade')
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}
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let { open: legacyOpen, Cursor: legacyCursor } = upgradeModule
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let filePath = extname(path) ? path : path + '/data.mdb'
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console.log('Upgrading', filePath, 'to LMDB 1.0 format')
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let tempPath = filePath.replace(/([^\\\/]+)$/, 'temp-$1')
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let maxDbs = options.maxDbs || 20
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let sourceStore = legacyOpen(path, { maxDbs, encoding: 'binary' })
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let targetStore = open(tempPath, { maxDbs, encoding: 'binary', mapSize: sourceStore.env.info().mapSize })
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let targetTxn = targetStore.transaction(() => {
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copyDB(sourceStore, targetStore)
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function copyDB(sourceStore, targetStore) {
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let sourceTxn = sourceStore.env.beginTxn({ readOnly: true })
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let sourceDb = sourceStore.db
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let cursor = new legacyCursor(sourceTxn, sourceDb)
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let currentKey = cursor.goToFirst()
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while(currentKey) {
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let size = cursor.getCurrentBinaryUnsafe()
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if (cursor.getCurrentIsDatabase()) {
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copyDB(sourceStore.openDB(currentKey, {}), targetStore.openDB(currentKey))
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} else {
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targetStore.putSync(currentKey, sourceDb.unsafeBuffer.slice(0, size))
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}
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currentKey = cursor.goToNext()
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}
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cursor.close()
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sourceTxn.abort()
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}
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})
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sourceStore.close()
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targetStore.close()
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unlinkSync(filePath)
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renameSync(tempPath, filePath)
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try {
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unlinkSync(tempPath + '-lock')
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} catch (error) {}
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console.log('Finished upgrading', filePath)
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}
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