const { ObjectId } = require('mongodb') const { db, waitForDb, READ_PREFERENCE_SECONDARY, } = require('../../app/src/infrastructure/mongodb') const ONE_MONTH_IN_MS = 1000 * 60 * 60 * 24 * 31 let ID_EDGE_PAST const ID_EDGE_FUTURE = objectIdFromMs(Date.now() + 1000) let BATCH_DESCENDING let BATCH_SIZE let VERBOSE_LOGGING let BATCH_RANGE_START let BATCH_RANGE_END let BATCH_MAX_TIME_SPAN_IN_MS function refreshGlobalOptionsForBatchedUpdate(options = {}) { options = Object.assign({}, options, process.env) BATCH_DESCENDING = options.BATCH_DESCENDING === 'true' BATCH_SIZE = parseInt(options.BATCH_SIZE, 10) || 1000 VERBOSE_LOGGING = options.VERBOSE_LOGGING === 'true' if (options.BATCH_LAST_ID) { BATCH_RANGE_START = new ObjectId(options.BATCH_LAST_ID) } else if (options.BATCH_RANGE_START) { BATCH_RANGE_START = new ObjectId(options.BATCH_RANGE_START) } else { if (BATCH_DESCENDING) { BATCH_RANGE_START = ID_EDGE_FUTURE } else { BATCH_RANGE_START = ID_EDGE_PAST } } BATCH_MAX_TIME_SPAN_IN_MS = parseInt(options.BATCH_MAX_TIME_SPAN_IN_MS, 10) || ONE_MONTH_IN_MS if (options.BATCH_RANGE_END) { BATCH_RANGE_END = new ObjectId(options.BATCH_RANGE_END) } else { if (BATCH_DESCENDING) { BATCH_RANGE_END = ID_EDGE_PAST } else { BATCH_RANGE_END = ID_EDGE_FUTURE } } } async function getNextBatch({ collection, query, start, end, projection, findOptions, }) { if (BATCH_DESCENDING) { query._id = { $gt: end, $lt: start, } } else { query._id = { $gt: start, $lt: end, } } return await collection .find(query, findOptions) .project(projection) .sort({ _id: BATCH_DESCENDING ? -1 : 1 }) .limit(BATCH_SIZE) .toArray() } async function performUpdate(collection, nextBatch, update) { return collection.updateMany( { _id: { $in: nextBatch.map(entry => entry._id) } }, update ) } function objectIdFromMs(ms) { return ObjectId.createFromTime(ms / 1000) } function getMsFromObjectId(id) { return id.getTimestamp().getTime() } function getNextEnd(start) { let end if (BATCH_DESCENDING) { end = objectIdFromMs(getMsFromObjectId(start) - BATCH_MAX_TIME_SPAN_IN_MS) if (getMsFromObjectId(end) <= getMsFromObjectId(BATCH_RANGE_END)) { end = BATCH_RANGE_END } } else { end = objectIdFromMs(getMsFromObjectId(start) + BATCH_MAX_TIME_SPAN_IN_MS) if (getMsFromObjectId(end) >= getMsFromObjectId(BATCH_RANGE_END)) { end = BATCH_RANGE_END } } return end } async function getIdEdgePast(collection) { const [first] = await collection .find({}) .project({ _id: 1 }) .limit(1) .toArray() if (!first) return null // Go 1s further into the past in order to include the first entry via // first._id > ID_EDGE_PAST return objectIdFromMs(Math.max(0, getMsFromObjectId(first._id) - 1000)) } async function batchedUpdate( collectionName, query, update, projection, findOptions, batchedUpdateOptions ) { await waitForDb() const collection = db[collectionName] ID_EDGE_PAST = await getIdEdgePast(collection) if (!ID_EDGE_PAST) { console.warn(`The collection ${collectionName} appears to be empty.`) return 0 } refreshGlobalOptionsForBatchedUpdate(batchedUpdateOptions) findOptions = findOptions || {} findOptions.readPreference = READ_PREFERENCE_SECONDARY projection = projection || { _id: 1 } let nextBatch let updated = 0 let start = BATCH_RANGE_START while (start !== BATCH_RANGE_END) { let end = getNextEnd(start) nextBatch = await getNextBatch({ collection, query, start, end, projection, findOptions, }) if (nextBatch.length > 0) { end = nextBatch[nextBatch.length - 1]._id updated += nextBatch.length if (VERBOSE_LOGGING) { console.log( `Running update on batch with ids ${JSON.stringify( nextBatch.map(entry => entry._id) )}` ) } else { console.error(`Running update on batch ending ${end}`) } if (typeof update === 'function') { await update(nextBatch) } else { await performUpdate(collection, nextBatch, update) } } console.error(`Completed batch ending ${end}`) start = end } return updated } function batchedUpdateWithResultHandling( collection, query, update, projection, options ) { batchedUpdate(collection, query, update, projection, options) .then(processed => { console.error({ processed }) process.exit(0) }) .catch(error => { console.error({ error }) process.exit(1) }) } module.exports = { batchedUpdate, batchedUpdateWithResultHandling, }