Add Sync.Storage.Local.updateSyncStates()

This speeds up updating of sync states, particularly after resetting
file sync history.

chrome/content/zotero/xpcom/storage/storageLocal.js

@@ -258,16 +258,26 @@ Zotero.Sync.Storage.Local = {
 		//Zotero.debug("Memory usage: " + memmgr.resident);
 		
 		var changed = false;
-		for (let i = 0; i < items.length; i++) {
-			let item = items[i];
+		var statesToSet = {};
+		for (let item of items) {
 			// TODO: Catch error?
 			let state = yield this._checkForUpdatedFile(item, attachmentData[item.id]);
 			if (state !== false) {
-				item.attachmentSyncState = state;
-				yield item.saveTx({ skipAll: true });
+				if (!statesToSet[state]) {
+					statesToSet[state] = [];
+				}
+				statesToSet[state].push(item);
 				changed = true;
 			}
 		}
+		// Update sync states in bulk
+		if (changed) {
+			yield Zotero.DB.executeTransaction(function* () {
+				for (let state in statesToSet) {
+					yield this.updateSyncStates(statesToSet[state], parseInt(state));
+				}
+			}.bind(this));
+		}
 		
 		if (!items.length) {
 			Zotero.debug("No synced files have changed locally");
@@ -499,6 +509,35 @@ Zotero.Sync.Storage.Local = {
 	},
 	
 	
+	/**
+	 * @param {Zotero.Item[]} items
+	 * @param {String|Integer} syncState
+	 * @return {Promise}
+	 */
+	updateSyncStates: function (items, syncState) {
+		if (syncState === undefined) {
+			throw new Error("Sync state not specified");
+		}
+		if (typeof syncState == 'string') {
+			syncState = this["SYNC_STATE_" + syncState.toUpperCase()];
+		}
+		return Zotero.Utilities.Internal.forEachChunkAsync(
+			items,
+			1000,
+			async function (chunk) {
+				chunk.forEach((item) => {
+					item._attachmentSyncState = syncState;
+				});
+				return Zotero.DB.queryAsync(
+					"UPDATE itemAttachments SET syncState=? WHERE itemID IN "
+						+ "(" + chunk.map(item => item.id).join(', ') + ")",
+					syncState
+				);
+			}
+		);
+	},
+	
+	
 	/**
 	 * Mark all stored files for upload checking
 	 *

test/tests/storageLocalTest.js

@@ -93,6 +93,28 @@ describe("Zotero.Sync.Storage.Local", function () {
 		})
 	})
 	
+	describe("#updateSyncStates()", function () {
+		it("should update attachment sync states to 'to_upload'", function* () {
+			var attachment1 = yield importFileAttachment('test.png');
+			attachment1.attachmentSyncState = 'in_sync';
+			yield attachment1.saveTx();
+			var attachment2 = yield importFileAttachment('test.png');
+			attachment2.attachmentSyncState = 'in_sync';
+			yield attachment2.saveTx();
+			
+			var local = Zotero.Sync.Storage.Local;
+			yield local.updateSyncStates([attachment1, attachment2], 'to_upload');
+			
+			for (let attachment of [attachment1, attachment2]) {
+				assert.strictEqual(attachment.attachmentSyncState, local.SYNC_STATE_TO_UPLOAD);
+				let state = yield Zotero.DB.valueQueryAsync(
+					"SELECT syncState FROM itemAttachments WHERE itemID=?", attachment.id
+				);
+				assert.strictEqual(state, local.SYNC_STATE_TO_UPLOAD);
+			}
+		});
+	});
+	
 	describe("#resetAllSyncStates()", function () {
 		it("should reset attachment sync states to 'to_upload'", function* () {
 			var attachment = yield importFileAttachment('test.png');