smartrequest/ts/smartrequest.request.ts
2020-08-24 12:01:38 +00:00

177 lines
5.0 KiB
TypeScript

import * as plugins from './smartrequest.plugins';
import * as interfaces from './smartrequest.interfaces';
import { IncomingMessage } from 'http';
export interface IExtendedIncomingMessage extends IncomingMessage {
body: any;
}
const buildUtf8Response = (
incomingMessageArg: IncomingMessage,
autoJsonParse = true
): Promise<IExtendedIncomingMessage> => {
const done = plugins.smartpromise.defer<IExtendedIncomingMessage>();
// Continuously update stream with data
let body = '';
incomingMessageArg.on('data', (chunkArg) => {
body += chunkArg;
});
incomingMessageArg.on('end', () => {
if (autoJsonParse) {
try {
(incomingMessageArg as IExtendedIncomingMessage).body = JSON.parse(body);
} catch (err) {
(incomingMessageArg as IExtendedIncomingMessage).body = body;
}
} else {
(incomingMessageArg as IExtendedIncomingMessage).body = body;
}
done.resolve(incomingMessageArg as IExtendedIncomingMessage);
});
return done.promise;
};
/**
* determine wether a url is a unix sock
* @param urlArg
*/
const testForUnixSock = (urlArg: string): boolean => {
const unixRegex = /^(http:\/\/|https:\/\/|)unix:/;
return unixRegex.test(urlArg);
};
/**
* determine socketPath and path for unixsock
*/
const parseSocketPathAndRoute = (stringToParseArg: string) => {
const parseRegex = /(.*):(.*)/;
const result = parseRegex.exec(stringToParseArg);
return {
socketPath: result[1],
path: result[2],
};
};
/**
* a custom http agent to make sure we can set custom keepAlive options for speedy subsequent calls
*/
const httpAgent = new plugins.agentkeepalive.default();
/**
* a custom http agent to make sure we can set custom keepAlive options for speedy subsequent calls
*/
const httpAgentKeepAliveFalse = new plugins.http.Agent({
maxFreeSockets: 0,
keepAlive: false,
keepAliveMsecs: 0,
});
/**
* a custom https agent to make sure we can set custom keepAlive options for speedy subsequent calls
*/
const httpsAgent = new plugins.agentkeepalive.HttpsAgent();
/**
* a custom https agent to make sure we can set custom keepAlive options for speedy subsequent calls
*/
const httpsAgentKeepAliveFalse = new plugins.https.Agent({
maxFreeSockets: 0,
keepAlive: false,
keepAliveMsecs: 0,
});
export let request = async (
domainArg: string,
optionsArg: interfaces.ISmartRequestOptions = {},
responseStreamArg: boolean = false,
requestDataFunc: (req: plugins.http.ClientRequest) => void = null
): Promise<IExtendedIncomingMessage> => {
const done = plugins.smartpromise.defer<any>();
// merge options
const defaultOptions: interfaces.ISmartRequestOptions = {
// agent: agent,
autoJsonParse: true,
keepAlive: true,
};
optionsArg = {
...defaultOptions,
...optionsArg,
};
// parse url
const parsedUrl = plugins.url.parse(domainArg);
optionsArg.hostname = parsedUrl.hostname;
if (parsedUrl.port) {
optionsArg.port = parseInt(parsedUrl.port, 10);
}
optionsArg.path = parsedUrl.path;
// determine if unixsock
if (testForUnixSock(domainArg)) {
const detailedUnixPath = parseSocketPathAndRoute(optionsArg.path);
optionsArg.socketPath = detailedUnixPath.socketPath;
optionsArg.path = detailedUnixPath.path;
}
// TODO: support tcp sockets
// lets determine the request module to use
const requestModule = (() => {
switch (true) {
case parsedUrl.protocol === 'https:' && optionsArg.keepAlive:
optionsArg.agent = httpsAgent;
return plugins.https;
case parsedUrl.protocol === 'https:' && !optionsArg.keepAlive:
optionsArg.agent = httpsAgentKeepAliveFalse;
return plugins.https;
case parsedUrl.protocol === 'http:' && optionsArg.keepAlive:
optionsArg.agent = httpAgent;
return plugins.http;
case parsedUrl.protocol === 'http:' && !optionsArg.keepAlive:
optionsArg.agent = httpAgentKeepAliveFalse;
return plugins.http;
}
})() as typeof plugins.https;
// lets perform the actual request
const requestToFire = requestModule.request(optionsArg, async (response) => {
if (responseStreamArg) {
done.resolve(response);
} else {
const builtResponse = await buildUtf8Response(response, optionsArg.autoJsonParse);
done.resolve(builtResponse);
}
});
// lets write the requestBody
if (optionsArg.requestBody) {
if (optionsArg.requestBody instanceof plugins.formData) {
optionsArg.requestBody.pipe(requestToFire).on('finish', (event) => {
requestToFire.end();
});
} else {
if (typeof optionsArg.requestBody !== 'string') {
optionsArg.requestBody = JSON.stringify(optionsArg.requestBody);
}
requestToFire.write(optionsArg.requestBody);
requestToFire.end();
}
} else if (requestDataFunc) {
requestDataFunc(requestToFire);
} else {
requestToFire.end();
}
// lets handle an error
requestToFire.on('error', (e) => {
console.error(e);
});
const result = await done.promise;
return result;
};