cps-no-pyr.es6

import {get, request} from "http";
import {readFile, writeFile} from "fs";

let host = "localhost";
let port = 8917;
let body = "";

get({host, port}, completeRequest(finalCb));

function finalCb(err, result) {
    if (err) {
        console.error(err);
        process.exit(1);
    }
    console.log(result);
}

function completeRequest(cb) {
    return response => {
        response.on("readable", () => {
            body += response.read();
        });
        response.on("end", writeToFoo(body, cb));
    };
}

function writeToFoo(body, cb) {
    return () => {
        writeFile(__dirname + "/foo", body, readFoo(cb));
    };
}

function readFoo(cb) {
    return err => {
        if (err) {
            return cb(err);
        }
        readFile(__dirname + "/foo", writeToBar(cb));
    };
}

function writeToBar(cb) {
    return (err, contents) => {
        if (err) {
            return cb(err);
        }
        writeFile(__dirname + "/bar", contents.toString().split("").reverse().join(""), postRequest(cb));
    };
}

function postRequest(cb) {
    return err => {
        if (err) {
            return cb(err);
        }
        request({host, port, method: "POST"}, completeRequest(cb)).end();
    };
}

function completeRequest(cb) {
    return response => {
        cb(null, "operation complete");
    };
}