56 lines
2.0 KiB
JavaScript
56 lines
2.0 KiB
JavaScript
/**
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* Tests transactions that are prepared after no writes.
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*
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* @tags: [uses_transactions, uses_prepare_transaction]
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*/
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(function() {
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"use strict";
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const dbName = "test";
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const collName = "empty_prepare";
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const testDB = db.getSiblingDB(dbName);
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const testColl = testDB.getCollection(collName);
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testColl.drop({writeConcern: {w: "majority"}});
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assert.commandWorked(testDB.runCommand({create: collName, writeConcern: {w: "majority"}}));
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const doc = {
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_id: 1,
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a: 1,
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b: 1
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};
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assert.commandWorked(testColl.insert(doc));
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const session = db.getMongo().startSession({causalConsistency: false});
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const sessionDB = session.getDatabase(dbName);
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const sessionColl = sessionDB.getCollection(collName);
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// ---- Test 1. No operations before prepare ----
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session.startTransaction();
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assert.commandFailedWithCode(sessionDB.adminCommand({prepareTransaction: 1}),
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ErrorCodes.OperationNotSupportedInTransaction);
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assert.commandFailedWithCode(session.abortTransaction_forTesting(), ErrorCodes.NoSuchTransaction);
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// ---- Test 2. Only reads before prepare ----
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session.startTransaction();
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assert.eq(doc, sessionColl.findOne({a: 1}));
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let res = assert.commandWorked(sessionDB.adminCommand({prepareTransaction: 1}));
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// Makes sure prepareTransaction returns prepareTimestamp in its response.
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assert(res.hasOwnProperty("prepareTimestamp"), tojson(res));
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assert.commandWorked(session.abortTransaction_forTesting());
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// ---- Test 3. Noop writes before prepare ----
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session.startTransaction();
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res = assert.commandWorked(sessionColl.update({a: 1}, {$set: {b: 1}}));
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assert.eq(res.nMatched, 1, tojson(res));
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assert.eq(res.nModified, 0, tojson(res));
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assert.eq(res.nUpserted, 0, tojson(res));
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res = assert.commandWorked(sessionDB.adminCommand({prepareTransaction: 1}));
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// Makes sure prepareTransaction returns prepareTimestamp in its response.
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assert(res.hasOwnProperty("prepareTimestamp"), tojson(res));
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assert.commandWorked(session.abortTransaction_forTesting());
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}());
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