(Near-One#467) Minor CLI improvements. Update README.

* CLI: make transfer functions callable directly from CLI (without
  "TESTING" prefix).
* CLI: improve `getErc20Balance` method.
* CLI: add `getBridgeOnNearBalance` method.
* Update README.
* Minor improvements.

README.md

@@ -69,7 +69,7 @@ To learn the commands that you can use with the rainbow bridge run
 Alternatively, clone this repo, `yarn install`, then you can see what commands you can use with:
 
 ```
-    ./index.js --help
+    cli/./index.js --help
 ```
 
 Parameters of each command can be specified through environment variables, command line arguments, entries in the `~/.rainbow/config.json` config file, or the default value will be used -- in that priority.
@@ -283,12 +283,19 @@ pm2 logs
 
 ### Transferring tokens
 
+Let's check the balance of the rainbow bridge prover on Near before transferring the tokens
+```bash
+rainbow get-bridge-on-near-balance --near-receiver-account rainbow_bridge_eth_on_near_prover
+```
+
 Finally, let's transfer some tokens
 
 ```bash
 rainbow transfer-eth-erc20-to-near --amount 1000 --eth-sender-sk 0x2bdd21761a483f71054e14f5b827213567971c676928d9a1808cbfa4b7501200 --near-receiver-account rainbow_bridge_eth_on_near_prover --near-master-account neartokenfactory
 ```
 
+Now you check the balance of the rainbow bridge prover again. You should notice the balance was changed.
+
 Note, when we deployed ERC20 to the Ethereum blockchain we have minted a large number of tokens to the default master
 key of Ganache, so we have transferred ERC20 tokens from it to `alice.test.near`.
 Notice that we are using `neartokenfactory` account here to pay for the NEAR gas fees, any account for which we know a secret key would've worked too.
@@ -302,6 +309,12 @@ rainbow transfer-eth-erc20-from-near --amount 1 --near-sender-account rainbow_br
 
 You should observe the change of the ERC20 balance as reported by the CLI.
 
+You can also manually check the ERC20 balance of the receiver before and after the transfer
+
+```bash
+rainbow get-erc20-balance 0xEC8bE1A5630364292E56D01129E8ee8A9578d7D8
+```
+
 ## Contract Development Workflow
 
 Above steps are ways to run a local bridge and development workflows you need if make any changes to rainbow-bridge-cli. If you want to update any of solidity or rust contracts, they're not in this repo now and workflow is as following.

cli/index.js

@@ -27,6 +27,7 @@ const {
   DeployToken,
   mintErc20,
   getErc20Balance,
+  getBridgeOnNearBalance,
   getClientBlockHeightHash,
   getAddressBySecretKey,
   ethToNearApprove,
@@ -640,7 +641,7 @@ const testingCommand = program
   )
 
 RainbowConfig.addOptions(
-  testingCommand
+  program
     .command('transfer-eth-erc20-to-near')
     .option('--amount <amount>', 'Amount of ERC20 tokens to transfer')
     .option(
@@ -679,7 +680,7 @@ RainbowConfig.addOptions(
 )
 
 RainbowConfig.addOptions(
-  testingCommand
+  program
     .command('transfer-eth-erc20-from-near')
     .option('--amount <amount>', 'Amount of ERC20 tokens to transfer')
     .option(
@@ -754,13 +755,13 @@ RainbowConfig.addOptions(
 )
 
 RainbowConfig.addOptions(
-  testingCommand
-    .command('get-erc20-balance <eth_account_address> <token_name>')
+  program
+    .command('get-erc20-balance <eth_account_address>')
     .description('Get ERC20 balance on Ethereum for specific token (e.g. erc20).'),
-  async (ethAccountAddress, tokenName, args) => {
-    if (tokenName) {
-      args.ethErc20Address = RainbowConfig.getParam(`eth-${tokenName}-address`)
-    }
+  async (ethAccountAddress, args) => {
+    console.log(
+      `(Contract: ${args.ethErc20Address}) ERC20 balance of ${ethAccountAddress} is:`
+    )
     await getErc20Balance({ ethAccountAddress, ...args })
   },
   [
@@ -770,6 +771,26 @@ RainbowConfig.addOptions(
   ]
 )
 
+RainbowConfig.addOptions(
+  program
+    .command('get-bridge-on-near-balance')
+    .option(
+      '--near-receiver-account <near_receiver_account>',
+      'The account on NEAR blockchain that received the minted token.'
+    )
+    .description('Gets balance on Near for Rainbow-Bridge Eth on Near Prover.'),
+  async (args) => {
+    await getBridgeOnNearBalance(args)
+  },
+  [
+    'near-master-account',
+    'near-erc20-account',
+    'near-network-id',
+    'near-node-url',
+    'near-master-sk'
+  ]
+)
+
 RainbowConfig.addOptions(
   testingCommand
     .command('get-client-block-height-hash')

testing/adapter/index.js

@@ -2,6 +2,7 @@ const fs = require('fs')
 const bs58 = require('bs58')
 const { toBuffer } = require('eth-util-lite')
 const {
+  nearAPI,
   RobustWeb3,
   remove0x,
   normalizeEthKey,
@@ -64,8 +65,8 @@ async function getErc20Balance ({ ethAccountAddress, ethNodeUrl, ethErc20Address
       JSON.parse(fs.readFileSync(ethErc20AbiPath)),
       remove0x(ethErc20Address)
     )
-    const result = await ethContract.methods.balanceOf(remove0x(ethAccountAddress)).call()
-    console.log(result)
+    const balance = await ethContract.methods.balanceOf(remove0x(ethAccountAddress)).call()
+    console.log(balance)
   } catch (error) {
     console.log('Failed', error.toString())
   }
@@ -198,10 +199,60 @@ async function nearToEthUnlock ({
   exit(0)
 }
 
+// View
+async function getBridgeOnNearBalance ({
+  nearReceiverAccount,
+  nearMasterAccount: nearMasterAccountId,
+  nearErc20Account,
+  nearMasterSk,
+  nearNetworkId,
+  nearNodeUrl,
+}) {
+  try {
+    // @ts-ignore
+    const keyStore = new nearAPI.keyStores.InMemoryKeyStore()
+    await keyStore.setKey(
+      nearNetworkId,
+      nearMasterAccountId,
+      nearAPI.KeyPair.fromString(nearMasterSk)
+    )
+    const near = await nearAPI.connect({
+      nodeUrl: nearNodeUrl,
+      networkId: nearNetworkId,
+      masterAccount: nearMasterAccountId,
+      deps: { keyStore: keyStore }
+    })
+    const nearMasterAccount = new nearAPI.Account(
+      near.connection,
+      nearMasterAccountId
+    )
+
+    const nearTokenContract = new nearAPI.Contract(
+      nearMasterAccount,
+      nearErc20Account,
+      {
+        changeMethods: [],
+        viewMethods: ['get_balance']
+      }
+    )
+
+    const balance = await nearTokenContract.get_balance({
+      owner_id: nearReceiverAccount
+    })
+    console.log(
+      `[Rainbow-Bridge on Near] Balance of ${nearReceiverAccount} is ${balance}`
+    )
+  } catch (error) {
+    console.log('Failed', error.toString())
+  }
+  exit(0)
+}
+
 exports.ethToNearApprove = ethToNearApprove
 exports.ethToNearLock = ethToNearLock
 exports.nearToEthUnlock = nearToEthUnlock
 exports.mintErc20 = mintErc20
 exports.getErc20Balance = getErc20Balance
 exports.getAddressBySecretKey = getAddressBySecretKey
 exports.getClientBlockHeightHash = getClientBlockHeightHash
+exports.getBridgeOnNearBalance = getBridgeOnNearBalance

testing/index.js

@@ -6,6 +6,7 @@ const {
 const {
   mintErc20,
   getErc20Balance,
+  getBridgeOnNearBalance,
   getClientBlockHeightHash,
   getAddressBySecretKey,
   ethToNearApprove,
@@ -18,6 +19,7 @@ exports.TransferEthERC20FromNear = TransferEthERC20FromNear
 exports.DeployToken = DeployToken
 exports.mintErc20 = mintErc20
 exports.getErc20Balance = getErc20Balance
+exports.getBridgeOnNearBalance = getBridgeOnNearBalance
 exports.getClientBlockHeightHash = getClientBlockHeightHash
 exports.getAddressBySecretKey = getAddressBySecretKey
 exports.ethToNearApprove = ethToNearApprove