FABN-929: Allow function chaining on Transaction

Return this from Transaction.setEventHandlerStrategy() and
Transaction.setTransient() to allow chaining of calls, for example:

await contract.createTransaction('name').setTransient(data).submit();

Change-Id: I859f452a9c902ce7de63bdd6e647eaf1edb22d08
Signed-off-by: Mark S. Lewis <mark_lewis@uk.ibm.com>

fabric-network/lib/transaction.js

@@ -73,9 +73,11 @@ class Transaction {
 	 * Set the event handler strategy to be used for this transaction invocation
 	 * instead of the default handler configured in the gateway options.
 	 * @param {Function} factoryFunction Event handler factory function.
+	 * @returns {Transaction} This object, to allow function chaining.
 	 */
 	setEventHandlerStrategy(factoryFunction) {
 		this._createTxEventHandler = factoryFunction;
+		return this;
 	}
 
 	/**
@@ -84,9 +86,11 @@ class Transaction {
 	 * private data to a transaction function.
 	 * @param {Object} transientMap Object with String property names and
 	 * Buffer property values.
+	 * @returns {Transaction} This object, to allow function chaining.
 	 */
 	setTransient(transientMap) {
 		this._transientMap = transientMap;
+		return this;
 	}
 
 	/**

fabric-network/test/transaction.js

@@ -60,6 +60,26 @@ describe('Transaction', () => {
 		});
 	});
 
+	describe('#setEventHandlerStrategy', () => {
+		it('returns this', () => {
+			const transaction = new Transaction(stubContract, 'name');
+			const stubEventHandler = sinon.createStubInstance(TransactionEventHandler);
+			const stubEventHandlerFactoryFn = () => stubEventHandler;
+
+			const result = transaction.setEventHandlerStrategy(stubEventHandlerFactoryFn);
+
+			expect(result).to.equal(transaction);
+		});
+	});
+
+	describe('#setTransient', () => {
+		it('returns this', () => {
+			const transaction = new Transaction(stubContract, 'name');
+			const result = transaction.setTransient(new Map());
+			expect(result).to.equal(transaction);
+		});
+	});
+
 	describe('#submit', () => {
 		const transactionName = 'TRANSACTION_NAME';
 		const expectedResult = Buffer.from('42');
@@ -182,8 +202,7 @@ describe('Transaction', () => {
 			const stubEventHandlerFactoryFn = sinon.stub();
 			stubEventHandlerFactoryFn.withArgs(txId, network, options).returns(stubEventHandler);
 
-			transaction.setEventHandlerStrategy(stubEventHandlerFactoryFn);
-			await transaction.submit();
+			await transaction.setEventHandlerStrategy(stubEventHandlerFactoryFn).submit();
 
 			sinon.assert.called(stubEventHandler.startListening);
 			sinon.assert.called(stubEventHandler.waitForEvents);
@@ -193,8 +212,7 @@ describe('Transaction', () => {
 			const transientMap = {key1: 'value1', key2: 'value2'};
 			expectedProposal.transientMap = transientMap;
 
-			transaction.setTransient(transientMap);
-			await transaction.submit();
+			await transaction.setTransient(transientMap).submit();
 
 			sinon.assert.calledWith(channel.sendTransactionProposal, sinon.match(expectedProposal));
 		});

test/integration/network-e2e/invoke.js

@@ -642,8 +642,7 @@ test('\n\n***** Network End-to-end flow: invoke transaction with transient data
 			key1: Buffer.from('value1'),
 			key2: Buffer.from('value2')
 		};
-		transaction.setTransient(transientMap);
-		const response = await transaction.submit();
+		const response = await transaction.setTransient(transientMap).submit();
 		t.pass('Got response: ' + response.toString('utf8'));
 		const result = JSON.parse(response.toString('utf8'));
 

test/integration/network-e2e/query.js

@@ -146,8 +146,7 @@ test('\n\n***** Network End-to-end flow: evaluate transaction with transient dat
 			key1: Buffer.from('value1'),
 			key2: Buffer.from('value2')
 		};
-		transaction.setTransient(transientMap);
-		const response = await transaction.evaluate();
+		const response = await transaction.setTransient(transientMap).evaluate();
 
 		t.pass('Got response: ' + response.toString('utf8'));
 		const result = JSON.parse(response.toString('utf8'));