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1x
1x
| // import { Kernel } from '@tao.js/core';
import { Network } from '@tao.js/core';
import seive from './seive';
// for backwards compatibility
const MAX_SAFE_INTEGER = Math.pow(2, 53) - 1;
let channelId = 0;
function newChannelId() {
return (channelId = ++channelId % MAX_SAFE_INTEGER);
}
function channelControl(channelId) {
return { channelId };
}
/**
* Filters handling of AppCons to the set of attached handlers of the Channel for only those
* AppCons that had a preceding AppCon originate from this Channel.
*
* @export
* @class Channel
*/
export default class Channel {
/**
*Creates an instance of Channel.
* @param {Kernel} kernel - an instance of a Kernel or other TAO Network on which to build a Channel by sharing the same underlying Network
* @param {(string|function)} [id] - pass either a desired Channel ID value as a `string` or a `function` that will be used to generate a Channel ID
* the `function` will be called with a new Channel ID integer value to help ensure uniqueness
* @param {boolean} [debug=false] - pass true to console.log internal activity
* @memberof Channel
*/
constructor(kernel, id, debug = false) {
this._debug = debug;
this._channelId =
typeof id === 'function' ? id(newChannelId()) : id || newChannelId();
this._channel = new Network();
this._channel.use(this.handleAppCon);
this._network = typeof kernel.use === 'function' ? kernel : kernel._network;
this._cloneWithId = typeof id === 'function' ? id : undefined;
}
/**
* Clones a Channel
*
* @param {(string|function)} [cloneId] - used as the cloned `Channel`'s ID,
* same as the `id` param to the `Channel` constructor, either an
* explicit value as a `string` or a `function` used to generate the Channel ID
* @returns
* @memberof Channel
*/
clone(cloneId) {
const clone = new Channel(
{ _network: this._network },
cloneId || this._cloneWithId
);
clone._channel = this._channel.clone();
return clone;
}
use(middleware) {
this._channel.use(middleware);
}
stop(middleware) {
this._channel.stop(middleware);
}
setCtx({ t, term, a, action, o, orient }, data) {
this._network.setCtxControl(
{ t, term, a, action, o, orient },
data,
channelControl(this._channelId),
(ac, control) => this.forwardAppCtx(ac, control)
);
}
setCtxControl(
{ t, term, a, action, o, orient },
data,
control,
forwardAppCtx
) {
const chanCtrl = channelControl(this._channelId);
this._network.setCtxControl(
{ t, term, a, action, o, orient },
data,
{ ...control, ...chanCtrl },
(ac, control) => {
this.forwardAppCtx(ac, control);
if (typeof forwardAppCtx === 'function') {
forwardAppCtx(ac, control);
}
}
);
}
setAppCtx(ac) {
this._network.setAppCtxControl(
ac,
channelControl(this._channelId),
(ac, control) => this.forwardAppCtx(ac, control)
);
}
setAppCtxControl(ac, control, forwardAppCtx) {
const chanCtrl = channelControl(this._channelId);
this._network.setAppCtxControl(
ac,
{ ...control, ...chanCtrl },
(ac, control) => {
this.forwardAppCtx(ac, control);
if (typeof forwardAppCtx === 'function') {
forwardAppCtx(ac, control);
}
}
);
}
forwardAppCtx(ac, control) {
this._debug &&
console.log(
`channel{${this._channelId}}::forwardAppCtx::ac:`,
ac.unwrapCtx()
);
this._debug &&
console.log(
`channel{${this._channelId}}::forwardAppCtx::control:`,
control
);
if (control.channelId === this._channelId) {
this._debug &&
console.log(
`channel{${this._channelId}}::forwardAppCtx::control check passed`
);
this._channel.setAppCtxControl(ac, control, a => this.setAppCtx(a));
}
this._debug &&
console.log(
`channel{${
this._channelId
}}::forwardAppCtx::calling network.setAppCtxControl`
);
this._network.setAppCtxControl(ac, control, (a, c) =>
this.forwardAppCtx(a, c)
);
}
handleAppCon(handler, ac, forwardAppCtx, control) {
return handler.handleAppCon(ac, forwardAppCtx, control);
}
addInterceptHandler({ t, term, a, action, o, orient }, handler) {
this._channel.addInterceptHandler(
{ t, term, a, action, o, orient },
handler
);
return this;
}
addAsyncHandler({ t, term, a, action, o, orient }, handler) {
this._channel.addAsyncHandler({ t, term, a, action, o, orient }, handler);
return this;
}
addInlineHandler({ t, term, a, action, o, orient }, handler) {
this._channel.addInlineHandler({ t, term, a, action, o, orient }, handler);
return this;
}
removeInterceptHandler({ t, term, a, action, o, orient }, handler) {
this._channel.removeInterceptHandler(
{ t, term, a, action, o, orient },
handler
);
return this;
}
removeAsyncHandler({ t, term, a, action, o, orient }, handler) {
this._channel.removeAsyncHandler(
{ t, term, a, action, o, orient },
handler
);
return this;
}
removeInlineHandler({ t, term, a, action, o, orient }, handler) {
this._channel.removeInlineHandler(
{ t, term, a, action, o, orient },
handler
);
return this;
}
bridgeFrom(TAO, ...trigrams) {
return seive(
this._channelId,
TAO,
this,
(ac, control) => control.channelId !== this._channelId,
...trigrams
);
}
}
|