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var utils = require('./../utils'); var Checkpointer = require('./checkpointer'); var backOff = require('./backoff'); var generateReplicationId = require('./generateReplicationId'); var getDocs = require('./getDocs'); function replicate(src, target, opts, returnValue, result) { var batches = []; // list of batches to be processed var currentBatch; // the batch currently being processed var pendingBatch = { seq: 0, changes: [], docs: [] }; // next batch, not yet ready to be processed var writingCheckpoint = false; // true while checkpoint is being written var changesCompleted = false; // true when all changes received var replicationCompleted = false; // true when replication has completed var last_seq = 0; var continuous = opts.continuous || opts.live || false; var batch_size = opts.batch_size || 100; var batches_limit = opts.batches_limit || 10; var changesPending = false; // true while src.changes is running var doc_ids = opts.doc_ids; var state = { cancelled: false }; var repId; var checkpointer; var allErrors = []; var changedDocs = []; // Like couchdb, every replication gets a unique session id var session = utils.uuid(); result = result || { ok: true, start_time: new Date(), docs_read: 0, docs_written: 0, doc_write_failures: 0, errors: [] }; var changesOpts = {}; returnValue.ready(src, target); function initCheckpointer() { if (checkpointer) { return utils.Promise.resolve(); } return generateReplicationId(src, target, opts).then(function (res) { repId = res; checkpointer = new Checkpointer(src, target, repId, state); }); } function writeDocs() { if (currentBatch.docs.length === 0) { return; } var docs = currentBatch.docs; return target.bulkDocs({docs: docs, new_edits: false}).then(function (res) { if (state.cancelled) { completeReplication(); throw new Error('cancelled'); } var errors = []; var errorsById = {}; res.forEach(function (res) { if (res.error) { result.doc_write_failures++; errors.push(res); errorsById[res.id] = res; } }); allErrors = allErrors.concat(errors); result.docs_written += currentBatch.docs.length - errors.length; var non403s = errors.filter(function (error) { return error.name !== 'unauthorized' && error.name !== 'forbidden'; }); changedDocs = []; docs.forEach(function(doc) { var error = errorsById[doc._id]; if (error) { returnValue.emit('denied', utils.clone(error)); } else { changedDocs.push(doc); } }); if (non403s.length > 0) { var error = new Error('bulkDocs error'); error.other_errors = errors; abortReplication('target.bulkDocs failed to write docs', error); throw new Error('bulkWrite partial failure'); } }, function (err) { result.doc_write_failures += docs.length; throw err; }); } function finishBatch() { writingCheckpoint = true; return checkpointer.writeCheckpoint(currentBatch.seq, session).then(function () { writingCheckpoint = false; if (state.cancelled) { completeReplication(); throw new Error('cancelled'); } result.last_seq = last_seq = currentBatch.seq; var outResult = utils.clone(result); outResult.docs = changedDocs; returnValue.emit('change', outResult); currentBatch = undefined; getChanges(); }).catch(function (err) { writingCheckpoint = false; abortReplication('writeCheckpoint completed with error', err); throw err; }); } function getDiffs() { var diff = {}; currentBatch.changes.forEach(function (change) { // Couchbase Sync Gateway emits these, but we can ignore them Iif (change.id === "_user/") { return; } diff[change.id] = change.changes.map(function (x) { return x.rev; }); }); return target.revsDiff(diff).then(function (diffs) { if (state.cancelled) { completeReplication(); throw new Error('cancelled'); } // currentBatch.diffs elements are deleted as the documents are written currentBatch.diffs = diffs; }); } function getBatchDocs() { return getDocs(src, currentBatch.diffs, state).then(function (docs) { docs.forEach(function (doc) { delete currentBatch.diffs[doc._id]; result.docs_read++; currentBatch.docs.push(doc); }); }); } function startNextBatch() { if (state.cancelled || currentBatch) { return; } if (batches.length === 0) { processPendingBatch(true); return; } currentBatch = batches.shift(); getDiffs() .then(getBatchDocs) .then(writeDocs) .then(finishBatch) .then(startNextBatch) .catch(function (err) { abortReplication('batch processing terminated with error', err); }); } function processPendingBatch(immediate) { if (pendingBatch.changes.length === 0) { if (batches.length === 0 && !currentBatch) { if ((continuous && changesOpts.live) || changesCompleted) { returnValue.state = 'pending'; returnValue.emit('paused'); } if (changesCompleted) { completeReplication(); } } return; } if ( immediate || changesCompleted || pendingBatch.changes.length >= batch_size ) { batches.push(pendingBatch); pendingBatch = { seq: 0, changes: [], docs: [] }; if (returnValue.state === 'pending' || returnValue.state === 'stopped') { returnValue.state = 'active'; returnValue.emit('active'); } startNextBatch(); } } function abortReplication(reason, err) { if (replicationCompleted) { return; } if (!err.message) { err.message = reason; } result.ok = false; result.status = 'aborting'; result.errors.push(err); allErrors = allErrors.concat(err); batches = []; pendingBatch = { seq: 0, changes: [], docs: [] }; completeReplication(); } function completeReplication() { if (replicationCompleted) { return; } Iif (state.cancelled) { result.status = 'cancelled'; if (writingCheckpoint) { return; } } result.status = result.status || 'complete'; result.end_time = new Date(); result.last_seq = last_seq; replicationCompleted = state.cancelled = true; var non403s = allErrors.filter(function (error) { return error.name !== 'unauthorized' && error.name !== 'forbidden'; }); if (non403s.length > 0) { var error = allErrors.pop(); if (allErrors.length > 0) { error.other_errors = allErrors; } error.result = result; backOff(opts, returnValue, error, function () { replicate(src, target, opts, returnValue); }); } else { result.errors = allErrors; returnValue.emit('complete', result); returnValue.removeAllListeners(); } } function onChange(change) { if (state.cancelled) { return completeReplication(); } var filter = utils.filterChange(opts)(change); if (!filter) { return; } pendingBatch.seq = change.seq; pendingBatch.changes.push(change); processPendingBatch(batches.length === 0); } function onChangesComplete(changes) { changesPending = false; if (state.cancelled) { return completeReplication(); } // if no results were returned then we're done, // else fetch more if (changes.results.length > 0) { changesOpts.since = changes.last_seq; getChanges(); } else { if (continuous) { changesOpts.live = true; getChanges(); } else { changesCompleted = true; } } processPendingBatch(true); } function onChangesError(err) { changesPending = false; Iif (state.cancelled) { return completeReplication(); } abortReplication('changes rejected', err); } function getChanges() { if (!( !changesPending && !changesCompleted && batches.length < batches_limit )) { return; } changesPending = true; function abortChanges() { changes.cancel(); } function removeListener() { returnValue.removeListener('cancel', abortChanges); } if (returnValue._changes) { // remove old changes() and listeners returnValue.removeListener('cancel', returnValue._abortChanges); returnValue._changes.cancel(); } returnValue.once('cancel', abortChanges); var changes = src.changes(changesOpts) .on('change', onChange); changes.then(removeListener, removeListener); changes.then(onChangesComplete) .catch(onChangesError); if (opts.retry) { // save for later so we can cancel if necessary returnValue._changes = changes; returnValue._abortChanges = abortChanges; } } function startChanges() { initCheckpointer().then(function () { if (state.cancelled) { completeReplication(); return; } return checkpointer.getCheckpoint().then(function (checkpoint) { last_seq = checkpoint; changesOpts = { since: last_seq, limit: batch_size, batch_size: batch_size, style: 'all_docs', doc_ids: doc_ids, returnDocs: true // required so we know when we're done }; if (opts.filter) { if (typeof opts.filter !== 'string') { // required for the client-side filter in onChange changesOpts.include_docs = true; } else { // ddoc filter changesOpts.filter = opts.filter; } } if (opts.query_params) { changesOpts.query_params = opts.query_params; } if (opts.view) { changesOpts.view = opts.view; } getChanges(); }); }).catch(function (err) { abortReplication('getCheckpoint rejected with ', err); }); } if (returnValue.cancelled) { // cancelled immediately completeReplication(); return; } if (!returnValue._addedListeners) { returnValue.once('cancel', completeReplication); if (typeof opts.complete === 'function') { returnValue.once('error', opts.complete); returnValue.once('complete', function (result) { opts.complete(null, result); }); } returnValue._addedListeners = true; } if (typeof opts.since === 'undefined') { startChanges(); } else { initCheckpointer().then(function () { writingCheckpoint = true; return checkpointer.writeCheckpoint(opts.since, session); }).then(function () { writingCheckpoint = false; Iif (state.cancelled) { completeReplication(); return; } last_seq = opts.since; startChanges(); }).catch(function (err) { writingCheckpoint = false; abortReplication('writeCheckpoint completed with error', err); throw err; }); } } module.exports = replicate; |