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var utils = require('../../utils'); var merge = require('../../merge'); var errors = require('../../deps/errors'); var idbUtils = require('./idb-utils'); var idbConstants = require('./idb-constants'); var idbBulkDocs = require('./idb-bulk-docs'); var idbAllDocs = require('./idb-all-docs'); var checkBlobSupport = require('./idb-blob-support'); var ADAPTER_VERSION = idbConstants.ADAPTER_VERSION; var ATTACH_AND_SEQ_STORE = idbConstants.ATTACH_AND_SEQ_STORE; var ATTACH_STORE = idbConstants.ATTACH_STORE; var BY_SEQ_STORE = idbConstants.BY_SEQ_STORE; var DETECT_BLOB_SUPPORT_STORE = idbConstants.DETECT_BLOB_SUPPORT_STORE; var DOC_STORE = idbConstants.DOC_STORE; var LOCAL_STORE = idbConstants.LOCAL_STORE; var META_STORE = idbConstants.META_STORE; var applyNext = idbUtils.applyNext; var compactRevs = idbUtils.compactRevs; var decodeDoc = idbUtils.decodeDoc; var decodeMetadata = idbUtils.decodeMetadata; var encodeMetadata = idbUtils.encodeMetadata; var fetchAttachmentsIfNecessary = idbUtils.fetchAttachmentsIfNecessary; var idbError = idbUtils.idbError; var postProcessAttachments = idbUtils.postProcessAttachments; var readBlobData = idbUtils.readBlobData; var taskQueue = idbUtils.taskQueue; var openTransactionSafely = idbUtils.openTransactionSafely; var cachedDBs = {}; var blobSupportPromise; function IdbPouch(opts, callback) { var api = this; taskQueue.queue.push({ action: function (thisCallback) { init(api, opts, thisCallback); }, callback: callback }); applyNext(); } function init(api, opts, callback) { var dbName = opts.name; var idb = null; api._meta = null; // called when creating a fresh new database function createSchema(db) { var docStore = db.createObjectStore(DOC_STORE, {keyPath : 'id'}); db.createObjectStore(BY_SEQ_STORE, {autoIncrement: true}) .createIndex('_doc_id_rev', '_doc_id_rev', {unique: true}); db.createObjectStore(ATTACH_STORE, {keyPath: 'digest'}); db.createObjectStore(META_STORE, {keyPath: 'id', autoIncrement: false}); db.createObjectStore(DETECT_BLOB_SUPPORT_STORE); // added in v2 docStore.createIndex('deletedOrLocal', 'deletedOrLocal', {unique : false}); // added in v3 db.createObjectStore(LOCAL_STORE, {keyPath: '_id'}); // added in v4 var attAndSeqStore = db.createObjectStore(ATTACH_AND_SEQ_STORE, {autoIncrement: true}); attAndSeqStore.createIndex('seq', 'seq'); attAndSeqStore.createIndex('digestSeq', 'digestSeq', {unique: true}); } // migration to version 2 // unfortunately "deletedOrLocal" is a misnomer now that we no longer // store local docs in the main doc-store, but whaddyagonnado function addDeletedOrLocalIndex(txn, callback) { var docStore = txn.objectStore(DOC_STORE); docStore.createIndex('deletedOrLocal', 'deletedOrLocal', {unique : false}); docStore.openCursor().onsuccess = function (event) { var cursor = event.target.result; if (cursor) { var metadata = cursor.value; var deleted = utils.isDeleted(metadata); metadata.deletedOrLocal = deleted ? "1" : "0"; docStore.put(metadata); cursor.continue(); } else { callback(); } }; } // migration to version 3 (part 1) function createLocalStoreSchema(db) { db.createObjectStore(LOCAL_STORE, {keyPath: '_id'}) .createIndex('_doc_id_rev', '_doc_id_rev', {unique: true}); } // migration to version 3 (part 2) function migrateLocalStore(txn, cb) { var localStore = txn.objectStore(LOCAL_STORE); var docStore = txn.objectStore(DOC_STORE); var seqStore = txn.objectStore(BY_SEQ_STORE); var cursor = docStore.openCursor(); cursor.onsuccess = function (event) { var cursor = event.target.result; if (cursor) { var metadata = cursor.value; var docId = metadata.id; var local = utils.isLocalId(docId); var rev = merge.winningRev(metadata); if (local) { var docIdRev = docId + "::" + rev; // remove all seq entries // associated with this docId var start = docId + "::"; var end = docId + "::~"; var index = seqStore.index('_doc_id_rev'); var range = IDBKeyRange.bound(start, end, false, false); var seqCursor = index.openCursor(range); seqCursor.onsuccess = function (e) { seqCursor = e.target.result; if (!seqCursor) { // done docStore.delete(cursor.primaryKey); cursor.continue(); } else { var data = seqCursor.value; if (data._doc_id_rev === docIdRev) { localStore.put(data); } seqStore.delete(seqCursor.primaryKey); seqCursor.continue(); } }; } else { cursor.continue(); } } else if (cb) { cb(); } }; } // migration to version 4 (part 1) function addAttachAndSeqStore(db) { var attAndSeqStore = db.createObjectStore(ATTACH_AND_SEQ_STORE, {autoIncrement: true}); attAndSeqStore.createIndex('seq', 'seq'); attAndSeqStore.createIndex('digestSeq', 'digestSeq', {unique: true}); } // migration to version 4 (part 2) function migrateAttsAndSeqs(txn, callback) { var seqStore = txn.objectStore(BY_SEQ_STORE); var attStore = txn.objectStore(ATTACH_STORE); var attAndSeqStore = txn.objectStore(ATTACH_AND_SEQ_STORE); // need to actually populate the table. this is the expensive part, // so as an optimization, check first that this database even // contains attachments var req = attStore.count(); req.onsuccess = function (e) { var count = e.target.result; if (!count) { return callback(); // done } seqStore.openCursor().onsuccess = function (e) { var cursor = e.target.result; if (!cursor) { return callback(); // done } var doc = cursor.value; var seq = cursor.primaryKey; var atts = Object.keys(doc._attachments || {}); var digestMap = {}; for (var j = 0; j < atts.length; j++) { var att = doc._attachments[atts[j]]; digestMap[att.digest] = true; // uniq digests, just in case } var digests = Object.keys(digestMap); for (j = 0; j < digests.length; j++) { var digest = digests[j]; attAndSeqStore.put({ seq: seq, digestSeq: digest + '::' + seq }); } cursor.continue(); }; }; } // migration to version 5 // Instead of relying on on-the-fly migration of metadata, // this brings the doc-store to its modern form: // - metadata.winningrev // - metadata.seq // - stringify the metadata when storing it function migrateMetadata(txn) { function decodeMetadataCompat(storedObject) { if (!storedObject.data) { // old format, when we didn't store it stringified storedObject.deleted = storedObject.deletedOrLocal === '1'; return storedObject; } return decodeMetadata(storedObject); } // ensure that every metadata has a winningRev and seq, // which was previously created on-the-fly but better to migrate var bySeqStore = txn.objectStore(BY_SEQ_STORE); var docStore = txn.objectStore(DOC_STORE); var cursor = docStore.openCursor(); cursor.onsuccess = function (e) { var cursor = e.target.result; if (!cursor) { return; // done } var metadata = decodeMetadataCompat(cursor.value); metadata.winningRev = metadata.winningRev || merge.winningRev(metadata); function fetchMetadataSeq() { // metadata.seq was added post-3.2.0, so if it's missing, // we need to fetch it manually var start = metadata.id + '::'; var end = metadata.id + '::\uffff'; var req = bySeqStore.index('_doc_id_rev').openCursor( IDBKeyRange.bound(start, end)); var metadataSeq = 0; req.onsuccess = function (e) { var cursor = e.target.result; if (!cursor) { metadata.seq = metadataSeq; return onGetMetadataSeq(); } var seq = cursor.primaryKey; if (seq > metadataSeq) { metadataSeq = seq; } cursor.continue(); }; } function onGetMetadataSeq() { var metadataToStore = encodeMetadata(metadata, metadata.winningRev, metadata.deleted); var req = docStore.put(metadataToStore); req.onsuccess = function () { cursor.continue(); }; } if (metadata.seq) { return onGetMetadataSeq(); } fetchMetadataSeq(); }; } api.type = function () { return 'idb'; }; api._id = utils.toPromise(function (callback) { callback(null, api._meta.instanceId); }); api._bulkDocs = function idb_bulkDocs(req, opts, callback) { idbBulkDocs(req, opts, api, idb, IdbPouch.Changes, callback); }; // First we look up the metadata in the ids database, then we fetch the // current revision(s) from the by sequence store api._get = function idb_get(id, opts, callback) { var doc; var metadata; var err; var txn; opts = utils.clone(opts); if (opts.ctx) { txn = opts.ctx; } else { var txnResult = openTransactionSafely(idb, [DOC_STORE, BY_SEQ_STORE, ATTACH_STORE], 'readonly'); if (txnResult.error) { return callback(txnResult.error); } txn = txnResult.txn; } function finish() { callback(err, {doc: doc, metadata: metadata, ctx: txn}); } txn.objectStore(DOC_STORE).get(id).onsuccess = function (e) { metadata = decodeMetadata(e.target.result); // we can determine the result here if: // 1. there is no such document // 2. the document is deleted and we don't ask about specific rev // When we ask with opts.rev we expect the answer to be either // doc (possibly with _deleted=true) or missing error if (!metadata) { err = errors.error(errors.MISSING_DOC, 'missing'); return finish(); } if (utils.isDeleted(metadata) && !opts.rev) { err = errors.error(errors.MISSING_DOC, "deleted"); return finish(); } var objectStore = txn.objectStore(BY_SEQ_STORE); var rev = opts.rev || metadata.winningRev; var key = metadata.id + '::' + rev; objectStore.index('_doc_id_rev').get(key).onsuccess = function (e) { doc = e.target.result; if (doc) { doc = decodeDoc(doc); } if (!doc) { err = errors.error(errors.MISSING_DOC, 'missing'); return finish(); } finish(); }; }; }; api._getAttachment = function (attachment, opts, callback) { var txn; opts = utils.clone(opts); if (opts.ctx) { txn = opts.ctx; } else { var txnResult = openTransactionSafely(idb, [DOC_STORE, BY_SEQ_STORE, ATTACH_STORE], 'readonly'); if (txnResult.error) { return callback(txnResult.error); } txn = txnResult.txn; } var digest = attachment.digest; var type = attachment.content_type; txn.objectStore(ATTACH_STORE).get(digest).onsuccess = function (e) { var body = e.target.result.body; readBlobData(body, type, opts.encode, function (blobData) { callback(null, blobData); }); }; }; api._info = function idb_info(callback) { if (idb === null || !cachedDBs[dbName]) { var error = new Error('db isn\'t open'); error.id = 'idbNull'; return callback(error); } var updateSeq; var docCount; var txnResult = openTransactionSafely(idb, [BY_SEQ_STORE], 'readonly'); if (txnResult.error) { return callback(txnResult.error); } var txn = txnResult.txn; var cursor = txn.objectStore(BY_SEQ_STORE).openCursor(null, 'prev'); cursor.onsuccess = function (event) { var cursor = event.target.result; updateSeq = cursor ? cursor.key : 0; // count within the same txn for consistency docCount = api._meta.docCount; }; txn.oncomplete = function () { callback(null, { doc_count: docCount, update_seq: updateSeq, // for debugging idb_attachment_format: (api._meta.blobSupport ? 'binary' : 'base64') }); }; }; api._allDocs = function idb_allDocs(opts, callback) { idbAllDocs(opts, api, idb, callback); }; api._changes = function (opts) { opts = utils.clone(opts); if (opts.continuous) { var id = dbName + ':' + utils.uuid(); IdbPouch.Changes.addListener(dbName, id, api, opts); IdbPouch.Changes.notify(dbName); return { cancel: function () { IdbPouch.Changes.removeListener(dbName, id); } }; } var docIds = opts.doc_ids && new utils.Set(opts.doc_ids); var descending = opts.descending ? 'prev' : null; opts.since = opts.since || 0; var lastSeq = opts.since; var limit = 'limit' in opts ? opts.limit : -1; if (limit === 0) { limit = 1; // per CouchDB _changes spec } var returnDocs; if ('returnDocs' in opts) { returnDocs = opts.returnDocs; } else { returnDocs = true; } var results = []; var numResults = 0; var filter = utils.filterChange(opts); var docIdsToMetadata = new utils.Map(); var txn; var bySeqStore; var docStore; function onGetCursor(cursor) { var doc = decodeDoc(cursor.value); var seq = cursor.key; if (docIds && !docIds.has(doc._id)) { return cursor.continue(); } var metadata; function onGetMetadata() { if (metadata.seq !== seq) { // some other seq is later return cursor.continue(); } lastSeq = seq; if (metadata.winningRev === doc._rev) { return onGetWinningDoc(doc); } fetchWinningDoc(); } function fetchWinningDoc() { var docIdRev = doc._id + '::' + metadata.winningRev; var req = bySeqStore.index('_doc_id_rev').openCursor( IDBKeyRange.bound(docIdRev, docIdRev + '\uffff')); req.onsuccess = function (e) { onGetWinningDoc(decodeDoc(e.target.result.value)); }; } function onGetWinningDoc(winningDoc) { var change = opts.processChange(winningDoc, metadata, opts); change.seq = metadata.seq; if (filter(change)) { numResults++; if (returnDocs) { results.push(change); } // process the attachment immediately // for the benefit of live listeners if (opts.attachments && opts.include_docs) { fetchAttachmentsIfNecessary(winningDoc, opts, txn, function () { postProcessAttachments([change]).then(function () { opts.onChange(change); }); }); } else { opts.onChange(change); } } if (numResults !== limit) { cursor.continue(); } } metadata = docIdsToMetadata.get(doc._id); if (metadata) { // cached return onGetMetadata(); } // metadata not cached, have to go fetch it docStore.get(doc._id).onsuccess = function (event) { metadata = decodeMetadata(event.target.result); docIdsToMetadata.set(doc._id, metadata); onGetMetadata(); }; } function onsuccess(event) { var cursor = event.target.result; if (!cursor) { return; } onGetCursor(cursor); } function fetchChanges() { var objectStores = [DOC_STORE, BY_SEQ_STORE]; if (opts.attachments) { objectStores.push(ATTACH_STORE); } var txnResult = openTransactionSafely(idb, objectStores, 'readonly'); if (txnResult.error) { return opts.complete(txnResult.error); } txn = txnResult.txn; txn.onerror = idbError(opts.complete); txn.oncomplete = onTxnComplete; bySeqStore = txn.objectStore(BY_SEQ_STORE); docStore = txn.objectStore(DOC_STORE); var req; if (descending) { req = bySeqStore.openCursor( null, descending); } else { req = bySeqStore.openCursor( IDBKeyRange.lowerBound(opts.since, true)); } req.onsuccess = onsuccess; } fetchChanges(); function onTxnComplete() { function finish() { opts.complete(null, { results: results, last_seq: lastSeq }); } if (!opts.continuous && opts.attachments) { // cannot guarantee that postProcessing was already done, // so do it again postProcessAttachments(results).then(finish); } else { finish(); } } }; api._close = function (callback) { if (idb === null) { return callback(errors.error(errors.NOT_OPEN)); } // https://developer.mozilla.org/en-US/docs/IndexedDB/IDBDatabase#close // "Returns immediately and closes the connection in a separate thread..." idb.close(); delete cachedDBs[dbName]; idb = null; callback(); }; api._getRevisionTree = function (docId, callback) { var txnResult = openTransactionSafely(idb, [DOC_STORE], 'readonly'); if (txnResult.error) { return callback(txnResult.error); } var txn = txnResult.txn; var req = txn.objectStore(DOC_STORE).get(docId); req.onsuccess = function (event) { var doc = decodeMetadata(event.target.result); if (!doc) { callback(errors.error(errors.MISSING_DOC)); } else { callback(null, doc.rev_tree); } }; }; // This function removes revisions of document docId // which are listed in revs and sets this document // revision to to rev_tree api._doCompaction = function (docId, revs, callback) { var stores = [ DOC_STORE, BY_SEQ_STORE, ATTACH_STORE, ATTACH_AND_SEQ_STORE ]; var txnResult = openTransactionSafely(idb, stores, 'readwrite'); if (txnResult.error) { return callback(txnResult.error); } var txn = txnResult.txn; var docStore = txn.objectStore(DOC_STORE); docStore.get(docId).onsuccess = function (event) { var metadata = decodeMetadata(event.target.result); merge.traverseRevTree(metadata.rev_tree, function (isLeaf, pos, revHash, ctx, opts) { var rev = pos + '-' + revHash; if (revs.indexOf(rev) !== -1) { opts.status = 'missing'; } }); compactRevs(revs, docId, txn); var winningRev = metadata.winningRev; var deleted = metadata.deleted; txn.objectStore(DOC_STORE).put( encodeMetadata(metadata, winningRev, deleted)); }; txn.onerror = idbError(callback); txn.oncomplete = function () { utils.call(callback); }; }; api._getLocal = function (id, callback) { var txnResult = openTransactionSafely(idb, [LOCAL_STORE], 'readonly'); if (txnResult.error) { return callback(txnResult.error); } var tx = txnResult.txn; var req = tx.objectStore(LOCAL_STORE).get(id); req.onerror = idbError(callback); req.onsuccess = function (e) { var doc = e.target.result; if (!doc) { callback(errors.error(errors.MISSING_DOC)); } else { delete doc['_doc_id_rev']; // for backwards compat callback(null, doc); } }; }; api._putLocal = function (doc, opts, callback) { if (typeof opts === 'function') { callback = opts; opts = {}; } delete doc._revisions; // ignore this, trust the rev var oldRev = doc._rev; var id = doc._id; if (!oldRev) { doc._rev = '0-1'; } else { doc._rev = '0-' + (parseInt(oldRev.split('-')[1], 10) + 1); } var tx = opts.ctx; var ret; if (!tx) { var txnResult = openTransactionSafely(idb, [LOCAL_STORE], 'readwrite'); if (txnResult.error) { return callback(txnResult.error); } tx = txnResult.txn; tx.onerror = idbError(callback); tx.oncomplete = function () { if (ret) { callback(null, ret); } }; } var oStore = tx.objectStore(LOCAL_STORE); var req; if (oldRev) { req = oStore.get(id); req.onsuccess = function (e) { var oldDoc = e.target.result; if (!oldDoc || oldDoc._rev !== oldRev) { callback(errors.error(errors.REV_CONFLICT)); } else { // update var req = oStore.put(doc); req.onsuccess = function () { ret = {ok: true, id: doc._id, rev: doc._rev}; if (opts.ctx) { // return immediately callback(null, ret); } }; } }; } else { // new doc req = oStore.add(doc); req.onerror = function (e) { // constraint error, already exists callback(errors.error(errors.REV_CONFLICT)); e.preventDefault(); // avoid transaction abort e.stopPropagation(); // avoid transaction onerror }; req.onsuccess = function () { ret = {ok: true, id: doc._id, rev: doc._rev}; if (opts.ctx) { // return immediately callback(null, ret); } }; } }; api._removeLocal = function (doc, callback) { var txnResult = openTransactionSafely(idb, [LOCAL_STORE], 'readwrite'); if (txnResult.error) { return callback(txnResult.error); } var tx = txnResult.txn; var ret; tx.oncomplete = function () { if (ret) { callback(null, ret); } }; var id = doc._id; var oStore = tx.objectStore(LOCAL_STORE); var req = oStore.get(id); req.onerror = idbError(callback); req.onsuccess = function (e) { var oldDoc = e.target.result; if (!oldDoc || oldDoc._rev !== doc._rev) { callback(errors.error(errors.MISSING_DOC)); } else { oStore.delete(id); ret = {ok: true, id: id, rev: '0-0'}; } }; }; api._destroy = function (callback) { IdbPouch.Changes.removeAllListeners(dbName); //Close open request for "dbName" database to fix ie delay. if (IdbPouch.openReqList[dbName] && IdbPouch.openReqList[dbName].result) { IdbPouch.openReqList[dbName].result.close(); delete cachedDBs[dbName]; } var req = indexedDB.deleteDatabase(dbName); req.onsuccess = function () { //Remove open request from the list. if (IdbPouch.openReqList[dbName]) { IdbPouch.openReqList[dbName] = null; } if (utils.hasLocalStorage() && (dbName in localStorage)) { delete localStorage[dbName]; } callback(null, { 'ok': true }); }; req.onerror = idbError(callback); }; var cached = cachedDBs[dbName]; if (cached) { idb = cached.idb; api._meta = cached.global; process.nextTick(function () { callback(null, api); }); return; } var req = indexedDB.open(dbName, ADAPTER_VERSION); if (!('openReqList' in IdbPouch)) { IdbPouch.openReqList = {}; } IdbPouch.openReqList[dbName] = req; req.onupgradeneeded = function (e) { var db = e.target.result; if (e.oldVersion < 1) { return createSchema(db); // new db, initial schema } // do migrations var txn = e.currentTarget.transaction; // these migrations have to be done in this function, before // control is returned to the event loop, because IndexedDB if (e.oldVersion < 3) { createLocalStoreSchema(db); // v2 -> v3 } if (e.oldVersion < 4) { addAttachAndSeqStore(db); // v3 -> v4 } var migrations = [ addDeletedOrLocalIndex, // v1 -> v2 migrateLocalStore, // v2 -> v3 migrateAttsAndSeqs, // v3 -> v4 migrateMetadata // v4 -> v5 ]; var i = e.oldVersion; function next() { var migration = migrations[i - 1]; i++; if (migration) { migration(txn, next); } } next(); }; req.onsuccess = function (e) { idb = e.target.result; idb.onversionchange = function () { idb.close(); delete cachedDBs[dbName]; }; idb.onabort = function () { idb.close(); delete cachedDBs[dbName]; }; var txn = idb.transaction([ META_STORE, DETECT_BLOB_SUPPORT_STORE, DOC_STORE ], 'readwrite'); var req = txn.objectStore(META_STORE).get(META_STORE); var blobSupport = null; var docCount = null; var instanceId = null; req.onsuccess = function (e) { var checkSetupComplete = function () { if (blobSupport === null || docCount === null || instanceId === null) { return; } else { api._meta = { name: dbName, instanceId: instanceId, blobSupport: blobSupport, docCount: docCount }; cachedDBs[dbName] = { idb: idb, global: api._meta }; callback(null, api); } }; // // fetch/store the id // var meta = e.target.result || {id: META_STORE}; if (dbName + '_id' in meta) { instanceId = meta[dbName + '_id']; checkSetupComplete(); } else { instanceId = utils.uuid(); meta[dbName + '_id'] = instanceId; txn.objectStore(META_STORE).put(meta).onsuccess = function () { checkSetupComplete(); }; } // // check blob support // if (!blobSupportPromise) { // make sure blob support is only checked once blobSupportPromise = checkBlobSupport(txn, idb); } blobSupportPromise.then(function (val) { blobSupport = val; checkSetupComplete(); }); // // count docs // var index = txn.objectStore(DOC_STORE).index('deletedOrLocal'); index.count(IDBKeyRange.only('0')).onsuccess = function (e) { docCount = e.target.result; checkSetupComplete(); }; }; }; req.onerror = idbError(callback); } IdbPouch.valid = function () { // Issue #2533, we finally gave up on doing bug // detection instead of browser sniffing. Safari brought us // to our knees. var isSafari = typeof openDatabase !== 'undefined' && /(Safari|iPhone|iPad|iPod)/.test(navigator.userAgent) && !/Chrome/.test(navigator.userAgent) && !/BlackBerry/.test(navigator.platform); // some outdated implementations of IDB that appear on Samsung // and HTC Android devices <4.4 are missing IDBKeyRange return !isSafari && typeof indexedDB !== 'undefined' && typeof IDBKeyRange !== 'undefined'; }; IdbPouch.Changes = new utils.Changes(); module.exports = IdbPouch; |