-
Notifications
You must be signed in to change notification settings - Fork 43
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge pull request #2043 from ExchangeUnion/feat/connext-multi-currency
feat(connext): multi currency support
- Loading branch information
Showing
8 changed files
with
1,147 additions
and
119 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| import { ethers } from 'ethers'; | ||
| import { curry } from 'ramda'; | ||
| import { from, Observable } from 'rxjs'; | ||
| import { mergeMap } from 'rxjs/operators'; | ||
| // This file will be a separate module with the above dependencies. | ||
|
|
||
| // gets the Ethereum provider object to read data from the chain | ||
| const getProvider = (host: string, port: number, name: string, chainId: number): ethers.providers.JsonRpcProvider => { | ||
| return new ethers.providers.JsonRpcProvider( | ||
| { url: `http://${host}:${port}/ethprovider/${chainId}` }, | ||
| { | ||
| name, | ||
| chainId, | ||
| }, | ||
| ); | ||
| }; | ||
|
|
||
| // gets the signer object necessary for write access (think unlock wallet) | ||
| const getSigner = (provider: ethers.providers.JsonRpcProvider, seed: string): ethers.Wallet => { | ||
| return ethers.Wallet.fromMnemonic(seed).connect(provider); | ||
| }; | ||
|
|
||
| // We curry getContract so that we can provide its arguments one at a time. | ||
| // This allows us to provide some of the necessary arguments (that we already have) before we export the function. | ||
| // Read more: https://ramdajs.com/docs/#curry | ||
| const getContract = curry( | ||
| (signer: ethers.Wallet, contractAddress: string): ethers.Contract => { | ||
| // we use the minimum viable contract ABI for ERC20 tokens | ||
| // for full contract ABI we should compile it from the solidity source | ||
| const erc20abi = ['function balanceOf(address) view returns (uint)', 'function transfer(address to, uint amount)']; | ||
| return new ethers.Contract(contractAddress, erc20abi, signer); | ||
| }, | ||
| ); | ||
|
|
||
| // Sends on-chain ERC20 transfer | ||
| // We also curry this function, just like the previous one. | ||
| // All the functions that we export out of the package will be curried | ||
| const onChainSendERC20 = curry( | ||
| ( | ||
| signer: ethers.Wallet, | ||
| contract: ethers.Contract, | ||
| destinationAddress: string, | ||
| units: string, | ||
| ): Observable<ethers.ContractTransaction> => { | ||
| // get the gas price | ||
| return from(signer.provider.getGasPrice()).pipe( | ||
| mergeMap( | ||
| (gasPrice) => | ||
| // then send the transaction | ||
| from(contract.transfer(destinationAddress, units, { gasPrice })) as Observable<ethers.ContractTransaction>, | ||
| ), | ||
| ); | ||
| }, | ||
| ); | ||
|
|
||
| // Sends on-chain ETH transfer | ||
| const onChainSendETH = curry( | ||
| (signer: ethers.Wallet, destinationAddress: string, units: string): Observable<ethers.ContractTransaction> => { | ||
| return from(signer.provider.getGasPrice()).pipe( | ||
| mergeMap((gasPrice) => { | ||
| const ether = ethers.utils.formatEther(units); | ||
| const value = ethers.utils.parseEther(ether); | ||
| return signer.sendTransaction({ | ||
| to: destinationAddress, | ||
| value, | ||
| gasPrice, | ||
| }); | ||
| }), | ||
| ); | ||
| }, | ||
| ); | ||
|
|
||
| // returns ETH on-chain balance for the address in wei | ||
| const getEthBalanceByAddress = curry((provider: ethers.providers.JsonRpcProvider, address: string) => | ||
| from(provider.getBalance(address)), | ||
| ); | ||
|
|
||
| // returns ERC20 on-chain balance for the contract address in the smallest unit | ||
| const getERC20Balance = curry( | ||
| (address: string, contract: ethers.Contract): Observable<ethers.BigNumber> => { | ||
| return from(contract.balanceOf(address)) as Observable<ethers.BigNumber>; | ||
| }, | ||
| ); | ||
|
|
||
| // This is the main function that has to be called before this package exposes more functions. | ||
| // Think of it as a constructor where we create the interal state of the module before | ||
| // we export more functionality to the consumer. | ||
| const getEthprovider = (host: string, port: number, name: string, chainId: number, seed: string) => { | ||
| // create the internal state | ||
| const provider = getProvider(host, port, name, chainId); | ||
| const signer = getSigner(provider, seed); | ||
| // because the functions below are curried we can only provide some of the arguments | ||
| const getERC20BalanceWithSigner = getERC20Balance(signer.address); | ||
| const getContractWithSigner = getContract(signer); | ||
| const onChainSendERC20WithSigner = onChainSendERC20(signer); | ||
| const onChainSendETHWithSigner = onChainSendETH(signer); | ||
| const getEthBalanceByAddressWithProvider = getEthBalanceByAddress(provider); | ||
| const onChainTransfer = (contractAddress: string, destinationAddress: string, units: string) => { | ||
| if (contractAddress === ethers.constants.AddressZero) { | ||
| return onChainSendETHWithSigner(destinationAddress, units); | ||
| } else { | ||
| const contract = getContractWithSigner(contractAddress); | ||
| return onChainSendERC20WithSigner(contract, destinationAddress, units); | ||
| } | ||
| }; | ||
| // expose functionality to the consumer | ||
| return { | ||
| getEthBalance: () => from(signer.getBalance()), | ||
| getEthBalanceByAddress: getEthBalanceByAddressWithProvider, | ||
| getContract: getContractWithSigner, | ||
| getERC20Balance: getERC20BalanceWithSigner, | ||
| getERC20BalanceByAddress: getERC20Balance, | ||
| onChainTransfer, | ||
| }; | ||
| }; | ||
|
|
||
| type EthProvider = ReturnType<typeof getEthprovider>; | ||
|
|
||
| export { getEthprovider, EthProvider }; |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.