all files / modules/utils/ callApp.js

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const Connection = require("../Connection");
const Promise = require("bluebird");
const R = require("ramda");
 
/**
 * Creates a new Connection using the given options and sends
 * the request to the given app. Returns a promise for the connection
 * object when the response is received.
 *
 * Options may be any of the Connection options, plus the following:
 *
 * - binary     By default the response content is buffered and stored
 *              in the responseText property of the connection. Set this
 *              option true to disable this behavior.
 * - maxLength  The maximum length of the response content to accept.
 *              This option has no effect when "binary" is true. By
 *              default there is no maximum length.
 * - encoding   The encoding to use to decode the response body. This
 *              option has no effect when "binary" is true. By default
 *              the encoding is whatever was specified in the Content-Type
 *              header of the response.
 *
 * If a modifier function is provided, it will have a chance to modify
 * the Connection object immediately before the request is made.
 */
function callApp(app, options, modifier) {
    options = options || {};
 
    const c = new Connection(options);
 
    return Promise.resolve(modifier ? modifier(c) : c).then(function (conn) {
        if (R.isNil(conn) || !R.is(Connection, conn)) {
            conn = c;
        }
 
        return conn.call(app).then(function () {
            if (options.binary) {
                return conn;
            }
 
            return conn.response.stringifyContent(options.maxLength, options.encoding).then(function (content) {
                conn.responseText = content;
                return conn;
            });
        });
    });
}
 
module.exports = callApp;