Merge pull request #22 from smartcontractkit/feat/update-chainlink-vrf-api

updated to reflect requestrandomness no longer needing seed phrase

Author: PatrickAlphaC

README.md

@@ -117,10 +117,10 @@ The VRFConsumer contract has two tasks, one to request a random number, and one
 npx hardhat fund-link --contract insert-contract-address-here --network network
 ```
 
-Once it's funded, you can perform a VRF request with the request-random-number task, passing in the required seed number:
+Once it's funded, you can perform a VRF request with the request-random-number task:
 
 ```bash
-npx hardhat request-random-number --contract insert-contract-address-here --seed '777777' --network network
+npx hardhat request-random-number --contract insert-contract-address-here --network network
 ```
 
 Once you have successfully made a request for a random number, you can see the result via the read-random-number task:

contracts/RandomNumberConsumer.sol

@@ -31,10 +31,10 @@ contract RandomNumberConsumer is VRFConsumerBase {
     }
 
     /** 
-     * Requests randomness from a user-provided seed
+     * Requests randomness
      */
-    function getRandomNumber(uint256 userProvidedSeed) public returns (bytes32 requestId) {
-        requestId = requestRandomness(keyHash, fee, userProvidedSeed);
+    function getRandomNumber() public returns (bytes32 requestId) {
+        requestId = requestRandomness(keyHash, fee);
         emit RequestedRandomness(requestId);
     }
 

deploy/03_Deploy_RandomNumberConsumer.js

@@ -34,8 +34,8 @@ module.exports = async ({
 
   log("Run the following command to fund contract with LINK:")
   log("npx hardhat fund-link --contract " + randomNumberConsumer.address + " --network " + networkConfig[chainId]['name'] + additionalMessage)
-  log("Then run RandomNumberConsumer contract with the following command, replacing '777' with your chosen seed number:")
-  log("npx hardhat request-random-number --contract " + randomNumberConsumer.address, " --seed '777'" + " --network " + networkConfig[chainId]['name'])
+  log("Then run RandomNumberConsumer contract with the following command")
+  log("npx hardhat request-random-number --contract " + randomNumberConsumer.address + " --network " + networkConfig[chainId]['name'])
   log("----------------------------------------------------")
 }
 

package.json

@@ -20,7 +20,7 @@
     "web3": "^1.2.9"
   },
   "dependencies": {
-    "@chainlink/contracts": "^0.1.6",
+    "@chainlink/contracts": "^0.1.9",
     "@chainlink/test-helpers": "0.0.5",
     "@chainlink/token": "^1.1.0",
     "@nomiclabs/hardhat-truffle5": "^2.0.0",

tasks/random-number-consumer/request-random-number.js

@@ -2,11 +2,9 @@
 
 task("request-random-number", "Requests a random number for a Chainlink VRF enabled smart contract")
     .addParam("contract", "The address of the API Consumer contract that you want to call")
-    .addParam("seed", "The seed to be used in the requst for randomness", 777, types.int)
     .setAction(async taskArgs => {
 
         const contractAddr = taskArgs.contract
-        const seed = taskArgs.seed
         const networkId = network.name
         console.log("Requesting a random number using VRF consumer contract ", contractAddr, " on network ", networkId)
         const RandomNumberConsumer = await ethers.getContractFactory("RandomNumberConsumer")
@@ -17,7 +15,7 @@ task("request-random-number", "Requests a random number for a Chainlink VRF enab
 
         //Create connection to VRF Contract and call the getRandomNumber function
         const vrfConsumerContract = new ethers.Contract(contractAddr, RandomNumberConsumer.interface, signer)
-        var result = await vrfConsumerContract.getRandomNumber(seed).then(function (transaction) {
+        var result = await vrfConsumerContract.getRandomNumber().then(function (transaction) {
             console.log('Contract ', contractAddr, ' external data request successfully called. Transaction Hash: ', transaction.hash)
             console.log("Run the following to read the returned random number:")
             console.log("npx hardhat read-random-number --contract " + contractAddr + " --network " + network.name)

test/RandomNumberConsumer_test.js

@@ -1,12 +1,11 @@
 const { expect } = require('chai')
 
 describe('RandomNumberConsumer', async function () {
-  let randomNumberConsumer, vrfCoordinatorMock, seed
+  let randomNumberConsumer, vrfCoordinatorMock
 
   beforeEach(async () => {
     await deployments.fixture(['mocks', 'vrf'])
 
-    seed = 123
     const LinkToken = await deployments.get('LinkToken')
     linkToken = await ethers.getContractAt('LinkToken', LinkToken.address)
     const RandomNumberConsumer = await deployments.get('RandomNumberConsumer')
@@ -18,7 +17,7 @@ describe('RandomNumberConsumer', async function () {
   it('Should successfully make an external random number request', async () => {
     const expected = '777'
     await linkToken.transfer(randomNumberConsumer.address, '2000000000000000000')
-    const transaction = await randomNumberConsumer.getRandomNumber(seed)
+    const transaction = await randomNumberConsumer.getRandomNumber()
     const tx_receipt = await transaction.wait()
     const requestId = tx_receipt.events[2].topics[0]