mpulse-query/lib/util/api.js

SOASTA mPulse Query REST API interface for Javascript

"use strict";

var log = require("./log");

var url = require("url");
var http = require("http");
var https = require("https");

function api(token, endpoint, method, requestBody, callback) {
	log.debug("sendRequest(endpoint=" + endpoint + ", method=" + method + ", requestBody=" + requestBody + ")");

	if (typeof requestBody === "object") {
		requestBody = JSON.stringify(requestBody);
		log.debug("Serialized requestBody to: " + requestBody);
	}

	var headers = {
		"Connection": "close"
	};

	if (requestBody) {
		headers["Content-Type"] = "application/json";
		headers["Content-Length"] = requestBody.length;
	}

	if (token) {
		headers.Authentication = token;
	}

	var options = url.parse(endpoint);
	options.method = method;
	options.headers = headers;
	log.debug(options.headers);
	var protocol = options.protocol === "http:" ? http : https;

	var responseBody = "";

	var req = protocol.request(options, function(response) {
		response.on("data", function(chunk) {
			responseBody += chunk;
		});

		response.on("end", function() {
			var responseCode = response.statusCode;
			log.debug("Got response code: " + responseCode + ", response body: " + responseBody);

			if (callback) {
				if (responseBody.trim().length === 0) {
					responseBody = null;
				}
				else {
					responseBody = JSON.parse(responseBody);
				}

				// Consider anything in the 200-299 range to be success.
				var error = null;
				if (responseCode < 200 || responseCode >= 300) {
					// Request failed.
					error = {
						code: responseCode,
						message: response.statusMessage
					};
				}

				callback(error, responseBody);
			}
		});

		response.on("error", function(error) {
			callback && callback(error);
		});
	});

	req.on("error", function(error) {
		callback && callback(error);
	});

	req.end(requestBody);
}

module.exports = api;