Make http requests cancelable

[serg-plusplus]

Why?

Taquito has very heavy methods under the hood which make a lot of requests, such as Estimate or ReadViewLambda.
When using it in interfaces, there is often a case when the method needs to be canceled almost immediately.
So, the goal is the network optimization.

My vision of this story is that there is an RPCOptions argument with the signal property in all of Taquito's methods that use RPC queries under the hood.

Made for https://developer.mozilla.org/en-US/docs/Web/API/AbortController.

Example

const abortCtrl = new AbortController();

const reqPromise = httpBackend.createRequest({ url: "https://...", signal: abortCtrl.signal });

reqPromise
  .then(console.info)
  .catch(console.error);

setTimeout(() => {
  abortCtrl.abort();
}, 100);

Use AbortController in different environments

There are three main environments where your JavaScript code can run in:

• Modern Browsers: You can use AbortController without problems because AbortController was created to work with the DOM by the WHATWG.
• Node: If you want to use AbortController in Node, you can do it using an implementation of the WHATWG AbortController interface. You can use different npm packages to achieve this, for example, abort-controller or node-fetch.
• Legacy Browsers: You need to use polyfills, for example, with Babel.

TODO

• Your code builds cleanly without any errors or warnings
• You have added unit tests
• You have added integration tests (if relevant/appropriate)
• All public methods or types have TypeDoc coverage with a complete description, and ideally an @example
• You have added or updated corresponding documentation
• If relevant, you have written a first draft summary describing the change for inclusion in Release Notes.

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[jevonearth]

Thanks for the @serh11p
We will schedule how to integrate this after we ship tzip16 and beacon v2 work. :) Really appreciate the PR illustrating the way.

[roxaneletourneau]

This implementation would require changes in the high-level API. Here is an example where a custom HttpBackend class is used to be able to cancel all requests: #914.
I'm closing this for now; an implementation to cancel specific requests will be considered when designing the issue 432, which might require providing a new API.