mirror of
https://github.com/advplyr/audiobookshelf.git
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84 lines
3.3 KiB
JavaScript
84 lines
3.3 KiB
JavaScript
/**
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* @typedef MigrationContext
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* @property {import('sequelize').QueryInterface} queryInterface - a suquelize QueryInterface object.
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* @property {import('../Logger')} logger - a Logger object.
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*
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* @typedef MigrationOptions
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* @property {MigrationContext} context - an object containing the migration context.
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*/
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const migrationVersion = '2.17.7'
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const migrationName = `${migrationVersion}-add-indices`
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const loggerPrefix = `[${migrationVersion} migration]`
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/**
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* This upward migration adds some indices to the libraryItems and books tables to improve query performance
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*
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* @param {MigrationOptions} options - an object containing the migration context.
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* @returns {Promise<void>} - A promise that resolves when the migration is complete.
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*/
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async function up({ context: { queryInterface, logger } }) {
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// Upwards migration script
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logger.info(`${loggerPrefix} UPGRADE BEGIN: ${migrationName}`)
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await addIndex(queryInterface, logger, 'libraryItems', ['libraryId', 'mediaType', 'size'])
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await addIndex(queryInterface, logger, 'books', ['duration'])
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logger.info(`${loggerPrefix} UPGRADE END: ${migrationName}`)
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}
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/**
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* This downward migration script removes the indices added in the upward migration script
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*
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* @param {MigrationOptions} options - an object containing the migration context.
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* @returns {Promise<void>} - A promise that resolves when the migration is complete.
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*/
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async function down({ context: { queryInterface, logger } }) {
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// Downward migration script
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logger.info(`${loggerPrefix} DOWNGRADE BEGIN: ${migrationName}`)
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await removeIndex(queryInterface, logger, 'libraryItems', ['libraryId', 'mediaType', 'size'])
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await removeIndex(queryInterface, logger, 'books', ['duration'])
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logger.info(`${loggerPrefix} DOWNGRADE END: ${migrationName}`)
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}
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/**
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* Utility function to add an index to a table. If the index already exists, it logs a message and continues.
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*
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* @param {import('sequelize').QueryInterface} queryInterface
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* @param {import ('../Logger')} logger
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* @param {string} tableName
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* @param {string[]} columns
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*/
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async function addIndex(queryInterface, logger, tableName, columns) {
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try {
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logger.info(`${loggerPrefix} adding index [${columns.join(', ')}] to table "${tableName}"`)
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await queryInterface.addIndex(tableName, columns)
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logger.info(`${loggerPrefix} added index [${columns.join(', ')}] to table "${tableName}"`)
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} catch (error) {
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if (error.name === 'SequelizeDatabaseError' && error.message.includes('already exists')) {
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logger.info(`${loggerPrefix} index [${columns.join(', ')}] for table "${tableName}" already exists`)
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} else {
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throw error
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}
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}
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}
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/**
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* Utility function to remove an index from a table.
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* Sequelize implemets it using DROP INDEX IF EXISTS, so it won't throw an error if the index doesn't exist.
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*
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* @param {import('sequelize').QueryInterface} queryInterface
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* @param {import ('../Logger')} logger
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* @param {string} tableName
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* @param {string[]} columns
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*/
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async function removeIndex(queryInterface, logger, tableName, columns) {
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logger.info(`${loggerPrefix} removing index [${columns.join(', ')}] from table "${tableName}"`)
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await queryInterface.removeIndex(tableName, columns)
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logger.info(`${loggerPrefix} removed index [${columns.join(', ')}] from table "${tableName}"`)
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}
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module.exports = { up, down }
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