Helper Methods
Helper methods during cross-chain transfers

Listen for Cross-Chain Transfer Transaction

Once you have the deposit hash there are two ways of listening for cross-chain transfer transaction.
  1. 1.
    One via SDK where you pass the callback method onFundsTransfered(data) in Hyphen constructor and let SDK call this method whenever a cross-chain transfer happens corresponding to the deposit transaction done by the user via SDK.
  2. 2.
    Or you can call the SDK method checkDepositStatus({depositHash, fromChainId}) manually to check the status of cross-chain transfer for a given depositHash and fromChainId.
Via Callback Method in Contructor
Manually Checking Status via SDK
let hyphen = new Hyphen(provider, {
// other options here
onFundsTransfered: (data) => {
/**
* data will contain following fields:
* fromChainId => Chain id from where funds were transferred
* toChainId => Chain id to where funds are transferred
* amount => Amount of tokens transferred in smallest unit of token
* tokenAddress => Address of token that was trasnferred
* depositHash => Deposit transacion hash on fromChainId
* exitHash => Transfer transaction hash on toChainId
**/
}
});
import { RESPONSE_CODES } from "@biconomy/hyphen";
const EXIT_STATUS = {
PROCESSING: 1,
PROCESSED: 2,
FAILED: 3
}
​
let depsitHash = "";
let fromChainId = 80001;
​
// Assuming you already have the deposit transaction hash and the chain id
// where the transaction was done.
​
// Periodically call checkDepositStatus method unitll you get the response
const response = await hyphen.depositManager.checkDepositStatus({
depositHash: depsitHash,
fromChainId: fromChainId
});
if(response && response.code === RESPONSE_CODES.SUCCESS) {
if(response.statusCode === EXIT_STATUS.PROCESSED && response.exitHash) {
// βœ… Cross-Chain transfer successfull
/**
* response will contain following fields:
*
* fromChainId => Chain id from where funds were transferred
* toChainId => Chain id to where funds are transferred
* amount => Amount of tokens transferred in smallest unit of token
* tokenAddress => Address of token that was trasnferred
* depositHash => Deposit transacion hash on fromChainId
* exitHash => Transfer transaction hash on toChainId
**/
} else if(response.statusCode === EXIT_STATUS.PROCESSING && response.exitHash) {
// Cross-chain transfer is initiated but transaction is not confirmed yet
/**
* response will contain following fields:
*
* fromChainId => Chain id from where funds were transferred
* toChainId => Chain id to where funds are transferred
* amount => Amount of tokens transferred in smallest unit of token
* tokenAddress => Address of token that was trasnferred
* depositHash => Deposit transacion hash on fromChainId
* exitHash => Transfer transaction hash on toChainId
**/
}
}
​
​
​

​

Trigger Cross-Chain Transfer Manually

In case you don't get the transfer transaction hash on the destination chain within 5 minutes and you are not getting the success response from checkDepositStatus method also, you can manually trigger the cross-chain transfer by calling triggerManualTransfer method.
// Assuming you already have the deposit transaction hash on fromChain
let depsitHash = "0x.....";
let fromChainId = "137";
​
let transferStatus = await hyphen.transfer.triggerManualTransfer(depsitHash, fromChainId);
​
if(transferStatus && transferStatus.code === 200 && transferStatus.exitHash) {
// Successfuly got the transfer transaction hash on toChain
// transferStatus will contain following fields
/*
* "code": Status code. 200 for success else failure.
* "message": Human readable response message.
* "exitHash": transaction hash for trasnfer transaction on toChain
**/
}
​
​
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Listen for Cross-Chain Transfer Transaction
Trigger Cross-Chain Transfer Manually