74 lines
2.2 KiB
JavaScript
74 lines
2.2 KiB
JavaScript
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var parseMessage = require('./parse-message').parseMessage;
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/**
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*
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* @param {*} parser
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* @param {Buffer} message
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* @param {*} shape
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* @api private
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*/
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function parseEvent(parser, message, shape) {
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var parsedMessage = parseMessage(message);
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// check if message is an event or error
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var messageType = parsedMessage.headers[':message-type'];
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if (messageType) {
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if (messageType.value === 'error') {
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throw parseError(parsedMessage);
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} else if (messageType.value !== 'event') {
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// not sure how to parse non-events/non-errors, ignore for now
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return;
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}
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}
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// determine event type
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var eventType = parsedMessage.headers[':event-type'];
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// check that the event type is modeled
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var eventModel = shape.members[eventType.value];
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if (!eventModel) {
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return;
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}
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var result = {};
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// check if an event payload exists
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var eventPayloadMemberName = eventModel.eventPayloadMemberName;
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if (eventPayloadMemberName) {
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var payloadShape = eventModel.members[eventPayloadMemberName];
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// if the shape is binary, return the byte array
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if (payloadShape.type === 'binary') {
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result[eventPayloadMemberName] = parsedMessage.body;
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} else {
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result[eventPayloadMemberName] = parser.parse(parsedMessage.body.toString(), payloadShape);
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}
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}
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// read event headers
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var eventHeaderNames = eventModel.eventHeaderMemberNames;
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for (var i = 0; i < eventHeaderNames.length; i++) {
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var name = eventHeaderNames[i];
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if (parsedMessage.headers[name]) {
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// parse the header!
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result[name] = eventModel.members[name].toType(parsedMessage.headers[name].value);
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}
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}
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var output = {};
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output[eventType.value] = result;
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return output;
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}
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function parseError(message) {
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var errorCode = message.headers[':error-code'];
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var errorMessage = message.headers[':error-message'];
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var error = new Error(errorMessage.value || errorMessage);
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error.code = error.name = errorCode.value || errorCode;
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return error;
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}
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/**
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* @api private
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*/
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module.exports = {
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parseEvent: parseEvent
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};
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