55 lines
1.5 KiB
Plaintext
55 lines
1.5 KiB
Plaintext
/**
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* exception-stream.js: TODO: add file header handler.
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*
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* (C) 2010 Charlie Robbins
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* MIT LICENCE
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*/
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'use strict';
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const { Writable } = require('readable-stream');
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/**
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* TODO: add class description.
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* @type {ExceptionStream}
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* @extends {Writable}
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*/
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module.exports = class ExceptionStream extends Writable {
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/**
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* Constructor function for the ExceptionStream responsible for wrapping a
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* TransportStream; only allowing writes of `info` objects with
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* `info.exception` set to true.
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* @param {!TransportStream} transport - Stream to filter to exceptions
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*/
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constructor(transport) {
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super({ objectMode: true });
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if (!transport) {
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throw new Error('ExceptionStream requires a TransportStream instance.');
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}
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// Remark (indexzero): we set `handleExceptions` here because it's the
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// predicate checked in ExceptionHandler.prototype.__getExceptionHandlers
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this.handleExceptions = true;
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this.transport = transport;
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}
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/**
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* Writes the info object to our transport instance if (and only if) the
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* `exception` property is set on the info.
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* @param {mixed} info - TODO: add param description.
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* @param {mixed} enc - TODO: add param description.
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* @param {mixed} callback - TODO: add param description.
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* @returns {mixed} - TODO: add return description.
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* @private
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*/
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_write(info, enc, callback) {
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if (info.exception) {
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return this.transport.log(info, callback);
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}
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callback();
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return true;
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}
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};
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