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request.ts
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request.ts
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import { request } from 'https'
import url from 'url'
import util from 'util'
import { IncomingMessage, Agent } from 'http';
function getHrefSize (href: string, agent: Agent, retry = false): Promise<number> {
let hrefParsed = url.parse(href)
let options = {
hostname: hrefParsed.hostname,
path: hrefParsed.path,
agent: agent,
}
return new Promise((resolve, reject) => {
const req = request(options)
req.end()
req.on('error', (error) => {
if (retry) {
reject(new Error(`Unable to get ${href}: ${error}`))
} else {
// retry once on errors like ECONNRESET
resolve(getHrefSize(href, agent, true))
}
})
req.on('response', (response: IncomingMessage) => {
response.socket.end()
if (response.statusCode === 302 && response.headers['location']) {
// @ts-ignore: redirect -> recurse
href = response.headers['location']
resolve(getHrefSize(href, agent))
} else if (response.statusCode === 429) {
if (retry) {
reject(new Error(`Got status "429 too many request" twice for ${href}.`))
return
}
let wait = 100 + 400 * Math.random();
console.warn(`Got 429 too many request for ${href}, waiting ${wait} ms.`)
setTimeout(() => resolve(getHrefSize(href, agent, true)), wait)
} else if (response.statusCode !== 200) {
reject(new Error(`Got status code ${response.statusCode} for request ${util.inspect(options)}.`))
} else {
let size = parseInt(response.headers['content-length'] || '')
if (typeof size !== 'number' || !isFinite(size)) {
reject(new Error(`Unable to parse content-length ${response.headers['content-length']} of ${href}`))
} else {
resolve(size)
}
}
})
})
}
export = getHrefSize