qna.js

'use strict';

let fs = require ('fs');
let https = require ('https');

// **********************************************
// *** Update or verify the following values. ***
// **********************************************

// NOTE: Replace this with a valid host name.
// let host = "askaboutblockchain.azurewebsites.net";
let host = "ehubbot.azurewebsites.net";

// NOTE: Replace this with a valid endpoint key.
// This is not your subscription key.
// To get your endpoint keys, call the GET /endpointkeys method.
// let endpoint_key = "ba5eac5c-0ec8-479a-80bd-8c527ae060d7";
let endpoint_key = "189f6541-fbcc-449a-a035-9f3729a27f19";
// 

// NOTE: Replace this with a valid knowledge base ID.
// Make sure you have published the knowledge base with the
// POST /knowledgebases/{knowledge base ID} method.
// let kb = "275be859-8d17-4817-876f-2e4cbaa369d3";
let kb = "41556151-d5f0-4d19-a1d1-ac399f8b671a";

let method = "/qnamaker/knowledgebases/" + kb + "/generateAnswer";

let question = {"question":"what is this?"};

let pretty_print = function (s) {
    return JSON.stringify(JSON.parse(s), null, 4);
}

// callback is the function to call when we have the entire response.
let response_handler = function (callback, response) {
    let body = '';
    response.on ('data', function (d) {
        body += d;
    });
    response.on ('end', function () {
// Call the callback function with the status code, headers, and body of the response.
        callback ({ status : response.statusCode, headers : response.headers, body : body });
    });
    response.on ('error', function (e) {
        console.log ('Error: ' + e.message);
    });
};

// Get an HTTP response handler that calls the specified callback function when we have the entire response.
let get_response_handler = function (callback) {
// Return a function that takes an HTTP response, and is closed over the specified callback.
// This function signature is required by https.request, hence the need for the closure.
    return function (response) {
        response_handler (callback, response);
    }
}

// callback is the function to call when we have the entire response from the POST request.
let post = function (path, content, callback) {
    let request_params = {
        method : 'POST',
        hostname : host,
        path : path,
        headers : {
            'Content-Type' : 'application/json',
            'Content-Length' : content.length,
            'Authorization' : 'EndpointKey ' + endpoint_key,
        }
    };

// Pass the callback function to the response handler.
    let req = https.request (request_params, get_response_handler (callback));
    req.write (content);
    req.end ();
}

// callback is the function to call when we have the response from the /knowledgebases POST method.
let get_answers = function (path, req, callback) {
    console.log ('Calling ' + host + path + '.');
// Send the POST request.
    post (path, req, function (response) {
        callback (response.body);
    });
}

// Convert the request to a string.
let content = JSON.stringify(question);



module.exports = {get_answers, method, content, pretty_print};