109 lines
2.8 KiB
JavaScript
109 lines
2.8 KiB
JavaScript
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'use strict';
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const EventEmitter = require('events');
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const getStream = require('get-stream');
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const is = require('@sindresorhus/is');
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const PCancelable = require('p-cancelable');
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const requestAsEventEmitter = require('./request-as-event-emitter');
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const {HTTPError, ParseError, ReadError} = require('./errors');
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const {options: mergeOptions} = require('./merge');
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const {reNormalize} = require('./normalize-arguments');
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const asPromise = options => {
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const proxy = new EventEmitter();
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const promise = new PCancelable((resolve, reject, onCancel) => {
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const emitter = requestAsEventEmitter(options);
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onCancel(emitter.abort);
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emitter.on('response', async response => {
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proxy.emit('response', response);
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const stream = is.null(options.encoding) ? getStream.buffer(response) : getStream(response, options);
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let data;
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try {
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data = await stream;
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} catch (error) {
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reject(new ReadError(error, options));
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return;
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}
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const limitStatusCode = options.followRedirect ? 299 : 399;
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response.body = data;
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try {
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for (const [index, hook] of Object.entries(options.hooks.afterResponse)) {
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// eslint-disable-next-line no-await-in-loop
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response = await hook(response, updatedOptions => {
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updatedOptions = reNormalize(mergeOptions(options, {
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...updatedOptions,
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retry: 0,
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throwHttpErrors: false
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}));
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// Remove any further hooks for that request, because we we'll call them anyway.
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// The loop continues. We don't want duplicates (asPromise recursion).
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updatedOptions.hooks.afterResponse = options.hooks.afterResponse.slice(0, index);
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return asPromise(updatedOptions);
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});
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}
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} catch (error) {
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reject(error);
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return;
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}
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const {statusCode} = response;
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if (options.json && response.body) {
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try {
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response.body = JSON.parse(response.body);
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} catch (error) {
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if (statusCode >= 200 && statusCode < 300) {
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const parseError = new ParseError(error, statusCode, options, data);
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Object.defineProperty(parseError, 'response', {value: response});
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reject(parseError);
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return;
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}
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}
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}
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if (statusCode !== 304 && (statusCode < 200 || statusCode > limitStatusCode)) {
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const error = new HTTPError(response, options);
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Object.defineProperty(error, 'response', {value: response});
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if (emitter.retry(error) === false) {
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if (options.throwHttpErrors) {
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reject(error);
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return;
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}
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resolve(response);
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}
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return;
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}
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resolve(response);
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});
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emitter.once('error', reject);
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[
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'request',
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'redirect',
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'uploadProgress',
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'downloadProgress'
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].forEach(event => emitter.on(event, (...args) => proxy.emit(event, ...args)));
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});
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promise.on = (name, fn) => {
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proxy.on(name, fn);
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return promise;
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};
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return promise;
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};
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module.exports = asPromise;
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