March 2019
Intermediate to advanced
636 pages
27h 50m
English
book
Blockchain Development with Hyperledger
by Salman A. Baset, Luc Desrosiers, Nitin Gaur, Petr Novotny
Content preview from Blockchain Development with Hyperledger
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User/client interaction modes
Although running curl commands is sufficient to test our web application, the proper way to expose the application to the user would be through one or more web pages, with widgets for the user to trigger those commands.
As we saw in the middleware implementation section, various operations, including chaincode invocations, are asynchronous. In our implementation, we masked this asynchronous behavior by making the wrapper function return to the caller, but only when the request had been successfully sent to the orderer and the events subscribed for had been received and validated. We can also choose to expose this asynchronous behavior to the web application client. Using Web Sockets (https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API ...
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