January 2020
Intermediate to advanced
530 pages
11h 11m
English
Content preview from Blockchain Development for Finance Projects
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Writing the transaction listener method
The transaction listener will connect to the gateway and monitor it for any events created by our corprem contract by doing the following:
- The transaction listener will first check our wallet to see whether an identity exists for connecting to the blockchain gateway. This is the user1 identity that we created for Bank A earlier. If the user exists, we move on to the next steps, shown in the following code block:
async function Transactionlistener (){try{ const wallet = new FileSystemWallet('~/fabric-samples/bankchain/wallet-BankA'); const userExists = await wallet.exists('user1'); if (!userExists) { console.log('An identity for the user "user1" does not exist in the wallet'); console.log('Run the ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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