function processRequest()

in source/api/services/cart/lib/index.js [83:206]
89 lines of code
17 McCabe index (conditional complexity)

function processRequest(event, ticket, cb) {

    let INVALID_PATH_ERR = {
        Error: ['Invalid path request ', event.resource, ', ', event.httpMethod].join('')
    };

    let _cart = new Cart();
    let _accessLog = new AccessLog();
    let _operation = '';
    let _response = '';
    let _accessValidator = new AccessValidator();

    let _body = {};
    if (event.body) {
        _body = JSON.parse(event.body);
    }

    if (event.resource === '/cart' && event.httpMethod === 'GET') {
        _operation = 'list items in the user\'s cart';
        _cart.getCartByUserId(ticket, function(err, data) {
            if (err) {
                console.log(err);
                _response = buildOutput(500, err);
                _accessLog.logEvent(event.requestContext.requestId, servicename, ticket.userid, _operation,
                    'failed/error',
                    function(err, resp) {
                        return cb(_response, null);
                    });
            } else {
                _response = buildOutput(200, data);
                _accessLog.logEvent(event.requestContext.requestId, servicename, ticket.userid, _operation,
                    'success',
                    function(err, resp) {
                        return cb(null, _response);
                    });
            }
        });
    } else if (event.resource === '/cart/{item_id}' && event.httpMethod === 'GET') {
        _operation = ['reading item', event.pathParameters.item_id, 'from user\'s cart'].join(' ');
        _cart.getCartItem(event.pathParameters.item_id, ticket, function(err, data) {
            if (err) {
                console.log(err);
                _response = buildOutput(500, err);
                _accessLog.logEvent(event.requestContext.requestId, servicename, ticket.userid, _operation,
                    'failed/error',
                    function(err, resp) {
                        return cb(_response, null);
                    });
            } else {
                _response = buildOutput(200, data);
                _accessLog.logEvent(event.requestContext.requestId, servicename, ticket.userid, _operation,
                    'success',
                    function(err, resp) {
                        return cb(null, _response);
                    });
            }
        });
    } else if (event.resource === '/cart/{item_id}' && event.httpMethod === 'DELETE') {
        _operation = ['removing item', event.pathParameters.item_id, 'from user\'s cart'].join(' ');
        _cart.deleteCartItem(event.pathParameters.item_id, ticket, function(err, data) {
            if (err) {
                console.log(err);
                _response = buildOutput(500, err);
                _accessLog.logEvent(event.requestContext.requestId, servicename, ticket.userid, _operation,
                    'failed/error',
                    function(err, resp) {
                        return cb(_response, null);
                    });
            } else {
                _response = buildOutput(200, data);
                _accessLog.logEvent(event.requestContext.requestId, servicename, ticket.userid, _operation,
                    'success',
                    function(err, resp) {
                        return cb(null, _response);
                    });
            }
        });
    } else if (event.resource === '/cart/{item_id}' && event.httpMethod === 'POST') {
        _operation = 'adding new item to the user\'s cart';
        _cart.createCartItem(_body, ticket, function(err, data) {
            if (err) {
                console.log(err);
                _response = buildOutput(500, err);
                _accessLog.logEvent(event.requestContext.requestId, servicename, ticket.userid, _operation,
                    'failed/error',
                    function(err, resp) {
                        return cb(_response, null);
                    });
            } else {
                _response = buildOutput(200, data);
                _accessLog.logEvent(event.requestContext.requestId, servicename, ticket.userid, _operation,
                    'success',
                    function(err, resp) {
                        return cb(null, _response);
                    });
            }
        });
    } else if (event.resource === '/cart' && event.httpMethod === 'POST') {
        _operation = 'checking out user\'s cart';

        let _authToken = _accessValidator.getAuthToken(event.headers);
        _cart.checkout(_body, ticket, _authToken, function(err, data) {
            if (err) {
                console.log(err);
                _response = buildOutput(500, err);
                _accessLog.logEvent(event.requestContext.requestId, servicename, ticket.userid, _operation,
                    'failed/error',
                    function(err, resp) {
                        return cb(_response, null);
                    });
            } else {
                _response = buildOutput(200, data);
                _accessLog.logEvent(event.requestContext.requestId, servicename, ticket.userid, _operation,
                    'success',
                    function(err, resp) {
                        return cb(null, _response);
                    });
            }
        });
    } else {
        _response = buildOutput(500, INVALID_PATH_ERR);
        return cb(_response, null);
    }
};