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Viewing file:     parse-event.js (2.16 KB)      -rw-r--r--

var parseMessage = require('./parse-message').parseMessage;

/**
 *
 * @param {*} parser
 * @param {Buffer} message
 * @param {*} shape
 * @api private
 */
function parseEvent(parser, message, shape) {
    var parsedMessage = parseMessage(message);

    // check if message is an event or error
    var messageType = parsedMessage.headers[':message-type'];
    if (messageType) {
        if (messageType.value === 'error') {
            throw parseError(parsedMessage);
        } else if (messageType.value !== 'event') {
            // not sure how to parse non-events/non-errors, ignore for now
            return;
        }
    }

    // determine event type
    var eventType = parsedMessage.headers[':event-type'];
    // check that the event type is modeled
    var eventModel = shape.members[eventType.value];
    if (!eventModel) {
        return;
    }

    var result = {};
    // check if an event payload exists
    var eventPayloadMemberName = eventModel.eventPayloadMemberName;
    if (eventPayloadMemberName) {
        var payloadShape = eventModel.members[eventPayloadMemberName];
        // if the shape is binary, return the byte array
        if (payloadShape.type === 'binary') {
            result[eventPayloadMemberName] = parsedMessage.body;
        } else {
            result[eventPayloadMemberName] = parser.parse(parsedMessage.body.toString(), payloadShape);
        }
    }

    // read event headers
    var eventHeaderNames = eventModel.eventHeaderMemberNames;
    for (var i = 0; i < eventHeaderNames.length; i++) {
        var name = eventHeaderNames[i];
        if (parsedMessage.headers[name]) {
            // parse the header!
            result[name] = eventModel.members[name].toType(parsedMessage.headers[name].value);
        }
    }

    var output = {};
    output[eventType.value] = result;
    return output;
}

function parseError(message) {
    var errorCode = message.headers[':error-code'];
    var errorMessage = message.headers[':error-message'];
    var error = new Error(errorMessage.value || errorMessage);
    error.code = error.name = errorCode.value || errorCode;
    return error;
}

/**
 * @api private
 */
module.exports = {
    parseEvent: parseEvent
};