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