January 2020
Intermediate to advanced
530 pages
11h 11m
English
Content preview from Blockchain Development for Finance Projects
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Watching orderbook events
Next let's write a method which will track events as they happen on the orderbook:
- The watchOrderbook method tracks the orderbook smart contract for any event. When a new event is received, that is, a new offer is submitted to the orderbook, it refreshes the orderbook to add the new event:
watchOrderbook() { let app = this;var contractOB = new app.watchweb3.eth.Contract(this.OrderbookABI.abi,this.OrderbookABI.address);
We start by instantiating our orderbook contract through the watchweb3 web3 object.
- Next, we get the latest block number from the blockchain. watchOrderbook starts watching for events after the orderbook is initialized and set for the first time. Thus, it starts watching from the block, after which ...
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