[cli] transfer:erc20 and balance commands

packages/cli/src/commands/account/balance.ts

@@ -1,22 +1,36 @@
 import { BaseCommand } from '../../base'
-import { printValueMap } from '../../utils/cli'
-import { Args } from '../../utils/command'
+import { failWith, printValueMap } from '../../utils/cli'
+import { Args, Flags } from '../../utils/command'
 
 export default class Balance extends BaseCommand {
-  static description = 'View Celo Dollar and Gold balances for an address'
+  static description = 'View Celo Stables and CELO balances for an address'
 
   static flags = {
     ...BaseCommand.flags,
+    erc20Address: Flags.address({
+      description: 'Address of generic ERC-20 token to also check balance for',
+    }),
   }
 
   static args = [Args.address('address')]
 
-  static examples = ['balance 0x5409ed021d9299bf6814279a6a1411a7e866a631']
+  static examples = [
+    'balance 0x5409ed021d9299bf6814279a6a1411a7e866a631',
+    'balance 0x5409ed021d9299bf6814279a6a1411a7e866a631 --erc20Address 0x765DE816845861e75A25fCA122bb6898B8B1282a',
+  ]
 
   async run() {
-    const { args } = this.parse(Balance)
+    const { args, flags } = this.parse(Balance)
 
     console.log('All balances expressed in units of 10^-18.')
     printValueMap(await this.kit.getTotalBalance(args.address))
+    if (flags.erc20Address) {
+      try {
+        const erc20 = await this.kit.contracts.getErc20(flags.erc20Address)
+        printValueMap({ erc20: await erc20.balanceOf(args.address) })
+      } catch {
+        failWith('Invalid erc20 address')
+      }
+    }
   }
 }

packages/cli/src/commands/exchange/show.ts

@@ -1,4 +1,4 @@
-import { StableTokenInfo } from '@celo/contractkit/src/celo-tokens'
+import { StableTokenInfo } from '@celo/contractkit/lib/celo-tokens'
 import { flags } from '@oclif/command'
 import { cli } from 'cli-ux'
 import { BaseCommand } from '../../base'

packages/cli/src/commands/transfer/erc20.ts

@@ -0,0 +1,57 @@
+import { Ierc20 } from '@celo/contractkit/lib/generated/IERC20'
+import { Erc20Wrapper } from '@celo/contractkit/lib/wrappers/Erc20Wrapper'
+import { flags } from '@oclif/command'
+import BigNumber from 'bignumber.js'
+import { BaseCommand } from '../../base'
+import { newCheckBuilder } from '../../utils/checks'
+import { displaySendTx, failWith } from '../../utils/cli'
+import { Flags } from '../../utils/command'
+
+export default class TransferErc20 extends BaseCommand {
+  static description = 'Transfer ERC20 to a specified address'
+
+  static flags = {
+    ...BaseCommand.flags,
+    erc20Address: Flags.address({
+      required: true,
+      description: "Custom erc20 to check it's balance too",
+    }),
+    from: Flags.address({
+      required: true,
+      description: 'Address of the sender',
+    }),
+    to: Flags.address({
+      required: true,
+      description: 'Address of the receiver',
+    }),
+    value: flags.string({
+      required: true,
+      description: 'Amount to transfer (in wei)',
+    }),
+  }
+
+  static examples = [
+    'erc20 --erc20Address 0x765DE816845861e75A25fCA122bb6898B8B1282a --from 0xa0Af2E71cECc248f4a7fD606F203467B500Dd53B --to 0x5409ed021d9299bf6814279a6a1411a7e866a631 --value 10000000000000000000',
+  ]
+
+  async run() {
+    const res = this.parse(TransferErc20)
+
+    const from: string = res.flags.from
+    const to: string = res.flags.to
+    const value = new BigNumber(res.flags.value)
+
+    this.kit.defaultAccount = from
+    let celoToken: Erc20Wrapper<Ierc20>
+    try {
+      celoToken = await this.kit.contracts.getErc20(res.flags.erc20Address)
+      // this call allow us to check if it is a valid erc20
+      await celoToken.balanceOf(res.flags.from)
+    } catch {
+      failWith('Invalid erc20 address')
+    }
+    await newCheckBuilder(this).hasEnoughErc20(from, value, res.flags.erc20Address).runChecks()
+
+    await displaySendTx('transfer', celoToken.transfer(to, value.toFixed()))
+  }
+}

packages/cli/src/utils/checks.ts

@@ -328,6 +328,16 @@ class CheckBuilder {
     )
   }
 
+  hasEnoughErc20 = (account: Address, value: BigNumber, erc20: Address) => {
+    const valueInEth = this.kit.connection.web3.utils.fromWei(value.toFixed(), 'ether')
+    return this.addCheck(`Account has at least ${valueInEth} erc20 token`, () =>
+      this.kit.contracts
+        .getErc20(erc20)
+        .then((goldToken) => goldToken.balanceOf(account))
+        .then((balance) => balance.gte(value))
+    )
+  }
+
   exceedsProposalMinDeposit = (deposit: BigNumber) =>
     this.addCheck(
       `Deposit is greater than or equal to governance proposal minDeposit`,

packages/sdk/contractkit/src/base.ts

@@ -6,6 +6,7 @@ export enum CeloContract {
   DowntimeSlasher = 'DowntimeSlasher',
   Election = 'Election',
   EpochRewards = 'EpochRewards',
+  ERC20 = 'ERC20',
   Escrow = 'Escrow',
   Exchange = 'Exchange',
   ExchangeEUR = 'ExchangeEUR',

packages/sdk/contractkit/src/contract-cache.ts

@@ -1,12 +1,14 @@
 import { CeloContract } from './base'
 import { StableToken } from './celo-tokens'
+import { Ierc20 } from './generated/IERC20'
 import { ContractKit } from './kit'
 import { AccountsWrapper } from './wrappers/Accounts'
 import { AttestationsWrapper } from './wrappers/Attestations'
 import { BlockchainParametersWrapper } from './wrappers/BlockchainParameters'
 import { DoubleSigningSlasherWrapper } from './wrappers/DoubleSigningSlasher'
 import { DowntimeSlasherWrapper } from './wrappers/DowntimeSlasher'
 import { ElectionWrapper } from './wrappers/Election'
+import { Erc20Wrapper } from './wrappers/Erc20Wrapper'
 // import { EpochRewardsWrapper } from './wrappers/EpochRewards'
 import { EscrowWrapper } from './wrappers/Escrow'
 import { ExchangeWrapper } from './wrappers/Exchange'
@@ -31,6 +33,7 @@ const WrapperFactories = {
   [CeloContract.DowntimeSlasher]: DowntimeSlasherWrapper,
   [CeloContract.Election]: ElectionWrapper,
   // [CeloContract.EpochRewards]?: EpochRewardsWrapper,
+  [CeloContract.ERC20]: Erc20Wrapper,
   [CeloContract.Escrow]: EscrowWrapper,
   [CeloContract.Exchange]: ExchangeWrapper,
   [CeloContract.ExchangeEUR]: ExchangeWrapper,
@@ -63,6 +66,7 @@ interface WrapperCacheMap {
   [CeloContract.DowntimeSlasher]?: DowntimeSlasherWrapper
   [CeloContract.Election]?: ElectionWrapper
   // [CeloContract.EpochRewards]?: EpochRewardsWrapper
+  [CeloContract.ERC20]?: Erc20Wrapper<Ierc20>
   [CeloContract.Escrow]?: EscrowWrapper
   [CeloContract.Exchange]?: ExchangeWrapper
   [CeloContract.ExchangeEUR]?: ExchangeWrapper
@@ -115,6 +119,9 @@ export class WrapperCache {
   // getEpochRewards() {
   //   return this.getContract(CeloContract.EpochRewards)
   // }
+  getErc20(address: string) {
+    return this.getContract(CeloContract.ERC20, address)
+  }
   getEscrow() {
     return this.getContract(CeloContract.Escrow)
   }

packages/sdk/contractkit/src/web3-contract-cache.ts

@@ -16,6 +16,7 @@ import { newFreezer } from './generated/Freezer'
 import { newGasPriceMinimum } from './generated/GasPriceMinimum'
 import { newGoldToken } from './generated/GoldToken'
 import { newGovernance } from './generated/Governance'
+import { newIerc20 } from './generated/IERC20'
 import { newLockedGold } from './generated/LockedGold'
 import { newMetaTransactionWallet } from './generated/MetaTransactionWallet'
 import { newMetaTransactionWalletDeployer } from './generated/MetaTransactionWalletDeployer'
@@ -40,6 +41,7 @@ export const ContractFactories = {
   [CeloContract.DowntimeSlasher]: newDowntimeSlasher,
   [CeloContract.Election]: newElection,
   [CeloContract.EpochRewards]: newEpochRewards,
+  [CeloContract.ERC20]: newIerc20,
   [CeloContract.Escrow]: newEscrow,
   [CeloContract.Exchange]: newExchange,
   [CeloContract.ExchangeEUR]: newExchangeEur,
@@ -98,6 +100,9 @@ export class Web3ContractCache {
   getEpochRewards() {
     return this.getContract(CeloContract.EpochRewards)
   }
+  getErc20(address: string) {
+    return this.getContract(CeloContract.ERC20, address)
+  }
   getEscrow() {
     return this.getContract(CeloContract.Escrow)
   }