botframework-streaming
Version:
Streaming library for the Microsoft Bot Framework
122 lines • 4.77 kB
JavaScript
;
/**
* @module botframework-streaming
*/
/**
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License.
*/
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.ContentStream = void 0;
/**
* A stream of fixed or infinite length containing content to be decoded.
*/
class ContentStream {
/**
* Initializes a new instance of the [ContentStream](xref:botframework-streaming.ContentStream) class.
*
* @param id The ID assigned to this instance.
* @param assembler The [PayloadAssembler](xref:botframework-streaming.PayloadAssembler) assigned to this instance.
*/
constructor(id, assembler) {
if (!assembler) {
throw Error('Null Argument Exception');
}
this.id = id;
this.assembler = assembler;
}
/**
* Gets the name of the type of the object contained within this [ContentStream](xref:botframework-streaming.ContentStream).
*
* @returns The [PayloadType](xref:botframework-streaming.PayloadType) of this [ContentStream](xref:botframework-streaming.ContentStream).
*/
get contentType() {
return this.assembler.payloadType;
}
/**
* Gets the length of this [ContentStream](xref:botframework-streaming.ContentStream).
*
* @returns A number representing the length of this [ContentStream](xref:botframework-streaming.ContentStream).
*/
get length() {
return this.assembler.contentLength;
}
/**
* Gets the data contained within this [ContentStream](xref:botframework-streaming.ContentStream).
*
* @returns This [ContentStream's](xref:botframework-streaming.ContentStream) [SubscribableStream](xref:botframework-streaming.SubscribableStream).
*/
getStream() {
if (!this.stream) {
this.stream = this.assembler.getPayloadStream();
}
return this.stream;
}
/**
* Closes the assembler.
*/
cancel() {
this.assembler.close();
}
/**
* Gets the [SubscribableStream](xref:botframework-streaming.SubscribableStream) content as a string.
*
* @returns A string Promise with [SubscribableStream](xref:botframework-streaming.SubscribableStream) content.
*/
readAsString() {
return __awaiter(this, void 0, void 0, function* () {
const { bufferArray } = yield this.readAll();
return (bufferArray || []).map((result) => result.toString('utf8')).join('');
});
}
/**
* Gets the [SubscribableStream](xref:botframework-streaming.SubscribableStream) content as a typed JSON object.
*
* @returns A typed object Promise with `SubscribableStream` content.
*/
readAsJson() {
return __awaiter(this, void 0, void 0, function* () {
const stringToParse = yield this.readAsString();
return JSON.parse(stringToParse);
});
}
readAll() {
return __awaiter(this, void 0, void 0, function* () {
// do a read-all
const allData = [];
let count = 0;
const stream = this.getStream();
// populate the array with any existing buffers
while (count < stream.length) {
const chunk = stream.read(stream.length);
allData.push(chunk);
count += chunk.length;
}
if (count < this.length) {
const readToEnd = new Promise((resolve) => {
const callback = (cs) => (chunk) => {
allData.push(chunk);
count += chunk.length;
if (count === cs.length) {
resolve(true);
}
};
stream.subscribe(callback(this));
});
yield readToEnd;
}
return { bufferArray: allData, size: count };
});
}
}
exports.ContentStream = ContentStream;
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