const { ReadPreference, ObjectId } = require('mongodb') const { db, waitForDb } = require('../../app/src/infrastructure/mongodb') const BATCH_DESCENDING = process.env.BATCH_DESCENDING === 'true' const BATCH_SIZE = parseInt(process.env.BATCH_SIZE, 10) || 1000 let BATCH_LAST_ID if (process.env.BATCH_LAST_ID) { BATCH_LAST_ID = ObjectId(process.env.BATCH_LAST_ID) } else if (process.env.BATCH_RANGE_START) { BATCH_LAST_ID = ObjectId(process.env.BATCH_RANGE_START) } let BATCH_RANGE_END if (process.env.BATCH_RANGE_END) { BATCH_RANGE_END = ObjectId(process.env.BATCH_RANGE_END) } async function getNextBatch(collection, query, maxId, projection, options) { const queryIdField = {} maxId = maxId || BATCH_LAST_ID if (maxId) { if (BATCH_DESCENDING) { queryIdField.$lt = maxId } else { queryIdField.$gt = maxId } } if (BATCH_RANGE_END) { if (BATCH_DESCENDING) { queryIdField.$gt = BATCH_RANGE_END } else { queryIdField.$lt = BATCH_RANGE_END } } if (queryIdField.$gt || queryIdField.$lt) { query._id = queryIdField } const entries = await collection .find(query, options) .project(projection) .sort({ _id: BATCH_DESCENDING ? -1 : 1 }) .limit(BATCH_SIZE) .toArray() return entries } async function performUpdate(collection, nextBatch, update) { return collection.updateMany( { _id: { $in: nextBatch.map(entry => entry._id) } }, update ) } async function batchedUpdate( collectionName, query, update, projection, options ) { await waitForDb() const collection = db[collectionName] options = options || {} options.readPreference = ReadPreference.SECONDARY projection = projection || { _id: 1 } let nextBatch let updated = 0 let maxId while ( (nextBatch = await getNextBatch( collection, query, maxId, projection, options )).length ) { maxId = nextBatch[nextBatch.length - 1]._id updated += nextBatch.length console.log( `Running update on batch with ids ${JSON.stringify( nextBatch.map(entry => entry._id) )}` ) if (typeof update === 'function') { await update(collection, nextBatch) } else { await performUpdate(collection, nextBatch, update) } console.error(`Completed batch ending ${maxId}`) } return updated } function batchedUpdateWithResultHandling( collection, query, update, projection, options ) { batchedUpdate(collection, query, update, projection, options) .then(updated => { console.error({ updated }) process.exit(0) }) .catch(error => { console.error({ error }) process.exit(1) }) } module.exports = { getNextBatch, batchedUpdate, batchedUpdateWithResultHandling, }