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erc20-inbound.md

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ERC20 - Inbound (ERC20 ⇒ WERC20)

Basic Steps

  • Send lock tx on Ethereum
  • Wait for storeman response on Wanchain
  • Send redeem tx on Wanchain
  • Wait for storeman response on Ethereum

Required and optional fields

Lock fields (- check the e20InboundInput field in the input.js )

  • symbol - the erc20 token symbol (MKR, LRC, etc.)

  • tokenAddr - the erc20 token address

  • to - the receiving Wanchain account

  • from - the sending Ethereum account

  • amount - the value to be transferred

  • lockTxHash - the lock tx id for locking process

Revoke fields

  • lockTxHash - the lock tx id for locking process

Using wanchain-js-sdk

Simple Usage: if the specified Wanchain and Ethereum accounts are open, just simply invoke a lock action and then invoke a redeem action.

//define the source chain and destination chain
srcChain = global.crossInvoker.getSrcChainNameByContractAddr(e20InboundInput.tokenAddr, 'ETH'); //note this tokenAddr
dstChain = global.crossInvoker.getSrcChainNameByContractAddr('WAN', 'WAN');

// do lock
global.crossInvoker.invoke(srcChain, dstChain, 'LOCK', e20InboundInput.lockInput);

...

// later, and even maybe else where, do redeem
txHashList = global.wanDb.getItem(walletCore.config.crossCollection, {lockTxHash: lockTxHash});
...
redeemInputCopy = Object.assign({}, e20InboundInput.redeemInput);
redeemInputCopy.x = txHashList.x;
redeemInputCopy.hashX = txHashList.hashX;
console.log('Starting eth inbound redeem', redeemInputCopy);

retReddem = await global.crossInvoker.invoke(srcChain, dstChain, 'REDEEM', redeemInputCopy)