@api.global/typedrequest
Version:
A TypeScript library for making typed requests towards APIs, including facilities for handling requests, routing, and virtual stream handling.
327 lines • 27.4 kB
JavaScript
import * as plugins from './plugins.js';
import { TypedRouter } from './typedrequest.classes.typedrouter.js';
/**
* 1. A VirtualStream connects over the network
* 2. It is always paired to one other VirtualStream
* on the other side with the same streamId.
* 3. It has a Readable and Writable side.
* 4. The Writable side is Readable on the other side and vice versa.
*/
export class VirtualStream {
// STATIC
static encodePayloadForNetwork(objectPayload, commFunctions, originalPayload, path = []) {
if (!objectPayload) {
return objectPayload;
}
if (plugins.smartbuffer.isBufferLike(objectPayload)) {
return objectPayload;
}
if (objectPayload instanceof VirtualStream) {
if (!objectPayload.side && commFunctions.sendMethod) {
objectPayload.side = 'requesting';
objectPayload.sendMethod = commFunctions.sendMethod;
}
if (!objectPayload.side && commFunctions.typedrouter) {
objectPayload.side = 'responding';
objectPayload.typedrouter = commFunctions.typedrouter;
commFunctions.typedrouter.registeredVirtualStreams.add(objectPayload);
}
if (!originalPayload.response || path.includes('response')) {
objectPayload.startKeepAliveLoop();
return {
_isVirtualStream: true,
streamId: objectPayload.streamId,
};
}
else {
return {
_OBMITTED_VIRTUAL_STREAM: true,
reason: 'path is under .request: obmitted for deduplication reasons in response cycle.',
};
}
}
else if (Array.isArray(objectPayload)) {
// For arrays, we recurse over each item.
return objectPayload.map((item, index) => VirtualStream.encodePayloadForNetwork(item, commFunctions, originalPayload || objectPayload, path.concat(String(index)) // Convert index to string and concatenate to path
));
}
else if (objectPayload !== null && typeof objectPayload === 'object') {
// For objects, we recurse over each key-value pair.
return Object.entries(objectPayload).reduce((acc, [key, value]) => {
const newPath = path.concat(key); // Concatenate the new key to the path
acc[key] = VirtualStream.encodePayloadForNetwork(value, commFunctions, originalPayload || objectPayload, newPath);
return acc;
}, {});
}
else {
return objectPayload;
}
}
static decodePayloadFromNetwork(objectPayload, commFunctions) {
if (plugins.smartbuffer.isBufferLike(objectPayload)
|| objectPayload instanceof TypedRouter) {
return objectPayload;
}
if (objectPayload !== null && typeof objectPayload === 'object') {
if (objectPayload._isVirtualStream) {
const virtualStream = new VirtualStream();
virtualStream.streamId = objectPayload.streamId;
if (!virtualStream.side && commFunctions.sendMethod) {
virtualStream.side = 'requesting';
virtualStream.sendMethod = commFunctions.sendMethod;
}
if (!virtualStream.side && commFunctions.typedrouter) {
virtualStream.side = 'responding';
virtualStream.typedrouter = commFunctions.typedrouter;
commFunctions.typedrouter.registeredVirtualStreams.add(virtualStream);
}
virtualStream.startKeepAliveLoop();
return virtualStream;
}
else if (Array.isArray(objectPayload)) {
const returnArray = [];
for (const item of objectPayload) {
returnArray.push(VirtualStream.decodePayloadFromNetwork(item, commFunctions));
}
return returnArray;
}
else {
return Object.keys(objectPayload).reduce((acc, key) => {
acc[key] = VirtualStream.decodePayloadFromNetwork(objectPayload[key], commFunctions);
return acc;
}, {});
}
}
else {
return objectPayload;
}
}
constructor() {
this.streamId = plugins.isounique.uni();
// wether to keep the stream alive
this.keepAlive = true;
// backpressured arrays
this.sendBackpressuredArray = new plugins.lik.BackpressuredArray(16);
this.receiveBackpressuredArray = new plugins.lik.BackpressuredArray(16);
}
/**
* takes care of sending
*/
async workOnQueue() {
if (this.side === 'requesting') {
let thisSideIsBackpressured = !this.receiveBackpressuredArray.checkSpaceAvailable();
let otherSideHasNext = false;
let otherSideIsBackpressured = false;
// helper functions
const getFeedback = async () => {
const streamTr = await this.sendMethod({
method: '##VirtualStream##',
request: {
streamId: this.streamId,
cycleId: plugins.isounique.uni(),
cycle: 'request',
mainPurpose: 'feedback',
next: this.sendBackpressuredArray.data.length > 0,
backpressure: this.receiveBackpressuredArray.checkSpaceAvailable(),
},
response: null,
}).catch(() => {
console.log('stream ended immaturely');
this.keepAlive = false;
});
if (streamTr && streamTr.response) {
otherSideIsBackpressured = streamTr.response.backpressure;
otherSideHasNext = streamTr.response.next;
}
};
await getFeedback();
// do work loop
while (this.sendBackpressuredArray.data.length > 0 || otherSideHasNext) {
let dataArg;
if (this.sendBackpressuredArray.data.length > 0) {
dataArg = this.sendBackpressuredArray.shift();
}
let streamTr;
streamTr = await this.sendMethod({
method: '##VirtualStream##',
request: {
streamId: this.streamId,
cycleId: plugins.isounique.uni(),
cycle: 'request',
mainPurpose: dataArg ? 'chunk' : 'read',
backpressure: thisSideIsBackpressured,
next: this.sendBackpressuredArray.data.length > 0,
...dataArg ? { chunkData: dataArg } : {},
},
response: null,
}).catch(() => {
console.log('stream ended immaturely');
this.keepAlive = false;
return null;
});
if (streamTr && streamTr.response && streamTr.response.chunkData) {
this.receiveBackpressuredArray.push(streamTr.response.chunkData);
}
thisSideIsBackpressured = this.receiveBackpressuredArray.checkSpaceAvailable();
// lets care about looping
otherSideHasNext = streamTr && streamTr.response && streamTr.response.next;
}
}
}
/**
* This method handles the stream only on the responding side
* @param streamTrArg
* @returns
*/
async handleStreamTr(streamTrArg) {
if (streamTrArg.request.keepAlive === true && this.keepAlive === true) {
this.lastKeepAliveEvent = Date.now();
}
else if (streamTrArg.request.keepAlive === false) {
this.keepAlive = false;
}
// keepAlive handling
if (streamTrArg.request.mainPurpose === 'keepAlive') {
// if the main purpose is keepAlive, we answer with a keepAlive
streamTrArg.response = {
streamId: this.streamId,
cycleId: streamTrArg.request.cycleId,
cycle: 'response',
mainPurpose: 'keepAlive',
keepAlive: this.keepAlive,
next: this.sendBackpressuredArray.data.length > 0,
backpressure: this.receiveBackpressuredArray.checkSpaceAvailable(),
};
}
// feedback handling
if (streamTrArg.request.mainPurpose === 'feedback') {
streamTrArg.response = {
streamId: this.streamId,
cycleId: streamTrArg.request.cycleId,
cycle: 'response',
mainPurpose: 'feedback',
next: this.sendBackpressuredArray.data.length > 0,
backpressure: this.receiveBackpressuredArray.checkSpaceAvailable(),
};
}
// chunk handling
if (streamTrArg.request.mainPurpose === 'chunk') {
this.receiveBackpressuredArray.push(streamTrArg.request.chunkData);
if (this.sendBackpressuredArray.data.length > 0 && streamTrArg.response.backpressure === false) {
const dataArg = this.sendBackpressuredArray.shift();
streamTrArg.response = {
streamId: this.streamId,
cycleId: streamTrArg.request.cycleId,
cycle: 'response',
mainPurpose: 'chunk',
next: this.sendBackpressuredArray.data.length > 1,
backpressure: this.receiveBackpressuredArray.checkSpaceAvailable(),
chunkData: this.sendBackpressuredArray.shift(),
};
}
else {
streamTrArg.response = {
streamId: this.streamId,
cycleId: streamTrArg.request.cycleId,
cycle: 'response',
mainPurpose: 'feedback',
next: this.sendBackpressuredArray.data.length > 0,
};
}
streamTrArg.request = null;
}
return streamTrArg;
}
// lifecycle methods
/**
* closes the virtual stream
*/
async cleanup() {
if (this.typedrouter) {
this.typedrouter.registeredVirtualStreams.remove(this);
}
}
/**
* a keepAlive loop that works across technologies
*/
async startKeepAliveLoop() {
// initially wait for a second
await plugins.smartdelay.delayFor(0);
let counter = 0;
keepAliveLoop: while (this.keepAlive) {
const triggerResult = await this.triggerKeepAlive();
await plugins.smartdelay.delayFor(1000);
}
await plugins.smartdelay.delayFor(1000);
await this.cleanup();
console.log(`cleaned up for stream ${this.streamId}`);
}
async triggerKeepAlive() {
if (this.side === 'requesting') {
console.log(`keepalive sent.`);
const streamTr = await this.sendMethod({
method: '##VirtualStream##',
request: {
streamId: this.streamId,
cycleId: plugins.isounique.uni(),
cycle: 'request',
mainPurpose: 'keepAlive',
keepAlive: true,
},
response: null,
}).catch(() => {
this.keepAlive = false;
});
// lets handle keepAlive
if (streamTr && streamTr.response && streamTr.response.keepAlive === false) {
this.keepAlive = false;
}
else {
this.lastKeepAliveEvent = Date.now();
}
if (streamTr && streamTr.response && streamTr.response.next) {
this.workOnQueue();
}
}
if (Date.now() - this.lastKeepAliveEvent > 10000) {
console.log(`closing stream for ${this.streamId}`);
this.keepAlive = false;
}
}
// Data sending and receiving
async sendData(dataArg) {
this.sendBackpressuredArray.push(dataArg);
this.workOnQueue();
await this.sendBackpressuredArray.waitForSpace();
}
async fetchData() {
if (this.receiveBackpressuredArray.hasSpace) {
// do something maybe?
}
await this.receiveBackpressuredArray.waitForItems();
const dataPackage = this.receiveBackpressuredArray.shift();
return dataPackage;
}
/**
* reads from a Readable and sends it to the other side
* @param readableStreamArg
*/
async readFromWebstream(readableStreamArg) {
const reader = readableStreamArg.getReader();
let streamIsDone = false;
while (!streamIsDone) {
const { value, done } = await reader.read();
if (value) {
await this.sendData(value);
}
streamIsDone = done;
}
}
async writeToWebstream(writableStreamArg) {
const writer = writableStreamArg.getWriter();
while (this.keepAlive) {
await writer.write(await this.fetchData());
}
}
}
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