зеркало из https://github.com/mozilla/gecko-dev.git
962 строки
25 KiB
JavaScript
962 строки
25 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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this.EXPORTED_SYMBOLS = ["Log"];
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const {classes: Cc, interfaces: Ci, results: Cr, utils: Cu} = Components;
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const ONE_BYTE = 1;
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const ONE_KILOBYTE = 1024 * ONE_BYTE;
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const ONE_MEGABYTE = 1024 * ONE_KILOBYTE;
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const STREAM_SEGMENT_SIZE = 4096;
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const PR_UINT32_MAX = 0xffffffff;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "OS",
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"resource://gre/modules/osfile.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "Task",
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"resource://gre/modules/Task.jsm");
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const INTERNAL_FIELDS = new Set(["_level", "_message", "_time", "_namespace"]);
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/*
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* Dump a message everywhere we can if we have a failure.
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*/
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function dumpError(text) {
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dump(text + "\n");
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Cu.reportError(text);
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}
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this.Log = {
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Level: {
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Fatal: 70,
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Error: 60,
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Warn: 50,
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Info: 40,
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Config: 30,
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Debug: 20,
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Trace: 10,
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All: -1, // We don't want All to be falsy.
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Desc: {
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70: "FATAL",
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60: "ERROR",
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50: "WARN",
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40: "INFO",
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30: "CONFIG",
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20: "DEBUG",
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10: "TRACE",
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"-1": "ALL",
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},
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Numbers: {
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"FATAL": 70,
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"ERROR": 60,
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"WARN": 50,
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"INFO": 40,
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"CONFIG": 30,
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"DEBUG": 20,
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"TRACE": 10,
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"ALL": -1,
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}
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},
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get repository() {
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delete Log.repository;
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Log.repository = new LoggerRepository();
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return Log.repository;
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},
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set repository(value) {
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delete Log.repository;
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Log.repository = value;
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},
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LogMessage,
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Logger,
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LoggerRepository,
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Formatter,
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BasicFormatter,
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MessageOnlyFormatter,
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StructuredFormatter,
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Appender,
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DumpAppender,
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ConsoleAppender,
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StorageStreamAppender,
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FileAppender,
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BoundedFileAppender,
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ParameterFormatter,
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// Logging helper:
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// let logger = Log.repository.getLogger("foo");
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// logger.info(Log.enumerateInterfaces(someObject).join(","));
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enumerateInterfaces: function Log_enumerateInterfaces(aObject) {
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let interfaces = [];
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for (let i in Ci) {
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try {
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aObject.QueryInterface(Ci[i]);
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interfaces.push(i);
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} catch (ex) {}
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}
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return interfaces;
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},
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// Logging helper:
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// let logger = Log.repository.getLogger("foo");
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// logger.info(Log.enumerateProperties(someObject).join(","));
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enumerateProperties(aObject, aExcludeComplexTypes) {
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let properties = [];
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for (let p in aObject) {
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try {
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if (aExcludeComplexTypes &&
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(typeof(aObject[p]) == "object" || typeof(aObject[p]) == "function"))
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continue;
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properties.push(p + " = " + aObject[p]);
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} catch (ex) {
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properties.push(p + " = " + ex);
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}
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}
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return properties;
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},
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_formatError: function _formatError(e) {
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let result = e.toString();
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if (e.fileName) {
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result += " (" + e.fileName;
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if (e.lineNumber) {
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result += ":" + e.lineNumber;
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}
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if (e.columnNumber) {
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result += ":" + e.columnNumber;
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}
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result += ")";
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}
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return result + " " + Log.stackTrace(e);
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},
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// This is for back compatibility with services/common/utils.js; we duplicate
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// some of the logic in ParameterFormatter
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exceptionStr: function exceptionStr(e) {
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if (!e) {
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return "" + e;
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}
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if (e instanceof Ci.nsIException) {
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return e.toString() + " " + Log.stackTrace(e);
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} else if (isError(e)) {
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return Log._formatError(e);
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}
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// else
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let message = e.message ? e.message : e;
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return message + " " + Log.stackTrace(e);
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},
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stackTrace: function stackTrace(e) {
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// Wrapped nsIException
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if (e.location) {
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let frame = e.location;
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let output = [];
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while (frame) {
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// Works on frames or exceptions, munges file:// URIs to shorten the paths
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// FIXME: filename munging is sort of hackish, might be confusing if
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// there are multiple extensions with similar filenames
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let str = "<file:unknown>";
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let file = frame.filename || frame.fileName;
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if (file) {
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str = file.replace(/^(?:chrome|file):.*?([^\/\.]+\.\w+)$/, "$1");
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}
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if (frame.lineNumber) {
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str += ":" + frame.lineNumber;
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}
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if (frame.name) {
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str = frame.name + "()@" + str;
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}
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if (str) {
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output.push(str);
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}
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frame = frame.caller;
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}
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return "Stack trace: " + output.join(" < ");
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}
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// Standard JS exception
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if (e.stack) {
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return "JS Stack trace: " + Task.Debugging.generateReadableStack(e.stack).trim()
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.replace(/\n/g, " < ").replace(/@[^@]*?([^\/\.]+\.\w+:)/g, "@$1");
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}
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return "No traceback available";
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}
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};
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/*
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* LogMessage
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* Encapsulates a single log event's data
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*/
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function LogMessage(loggerName, level, message, params) {
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this.loggerName = loggerName;
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this.level = level;
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/*
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* Special case to handle "log./level/(object)", for example logging a caught exception
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* without providing text or params like: catch(e) { logger.warn(e) }
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* Treating this as an empty text with the object in the 'params' field causes the
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* object to be formatted properly by BasicFormatter.
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*/
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if (!params && message && (typeof(message) == "object") &&
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(typeof(message.valueOf()) != "string")) {
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this.message = null;
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this.params = message;
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} else {
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// If the message text is empty, or a string, or a String object, normal handling
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this.message = message;
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this.params = params;
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}
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// The _structured field will correspond to whether this message is to
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// be interpreted as a structured message.
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this._structured = this.params && this.params.action;
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this.time = Date.now();
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}
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LogMessage.prototype = {
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get levelDesc() {
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if (this.level in Log.Level.Desc)
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return Log.Level.Desc[this.level];
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return "UNKNOWN";
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},
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toString: function LogMsg_toString() {
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let msg = "LogMessage [" + this.time + " " + this.level + " " +
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this.message;
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if (this.params) {
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msg += " " + JSON.stringify(this.params);
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}
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return msg + "]"
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}
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};
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/*
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* Logger
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* Hierarchical version. Logs to all appenders, assigned or inherited
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*/
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function Logger(name, repository) {
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if (!repository)
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repository = Log.repository;
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this._name = name;
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this.children = [];
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this.ownAppenders = [];
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this.appenders = [];
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this._repository = repository;
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}
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Logger.prototype = {
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get name() {
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return this._name;
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},
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_level: null,
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get level() {
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if (this._level != null)
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return this._level;
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if (this.parent)
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return this.parent.level;
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dumpError("Log warning: root logger configuration error: no level defined");
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return Log.Level.All;
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},
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set level(level) {
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this._level = level;
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},
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_parent: null,
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get parent() {
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return this._parent;
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},
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set parent(parent) {
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if (this._parent == parent) {
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return;
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}
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// Remove ourselves from parent's children
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if (this._parent) {
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let index = this._parent.children.indexOf(this);
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if (index != -1) {
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this._parent.children.splice(index, 1);
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}
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}
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this._parent = parent;
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parent.children.push(this);
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this.updateAppenders();
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},
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updateAppenders: function updateAppenders() {
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if (this._parent) {
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let notOwnAppenders = this._parent.appenders.filter(function(appender) {
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return this.ownAppenders.indexOf(appender) == -1;
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}, this);
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this.appenders = notOwnAppenders.concat(this.ownAppenders);
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} else {
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this.appenders = this.ownAppenders.slice();
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}
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// Update children's appenders.
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for (let i = 0; i < this.children.length; i++) {
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this.children[i].updateAppenders();
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}
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},
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addAppender: function Logger_addAppender(appender) {
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if (this.ownAppenders.indexOf(appender) != -1) {
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return;
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}
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this.ownAppenders.push(appender);
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this.updateAppenders();
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},
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removeAppender: function Logger_removeAppender(appender) {
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let index = this.ownAppenders.indexOf(appender);
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if (index == -1) {
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return;
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}
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this.ownAppenders.splice(index, 1);
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this.updateAppenders();
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},
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/**
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* Logs a structured message object.
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*
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* @param action
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* (string) A message action, one of a set of actions known to the
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* log consumer.
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* @param params
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* (object) Parameters to be included in the message.
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* If _level is included as a key and the corresponding value
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* is a number or known level name, the message will be logged
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* at the indicated level. If _message is included as a key, the
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* value is used as the descriptive text for the message.
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*/
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logStructured(action, params) {
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if (!action) {
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throw "An action is required when logging a structured message.";
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}
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if (!params) {
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this.log(this.level, undefined, {"action": action});
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return;
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}
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if (typeof(params) != "object") {
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throw "The params argument is required to be an object.";
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}
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let level = params._level;
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if (level) {
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let ulevel = level.toUpperCase();
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if (ulevel in Log.Level.Numbers) {
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level = Log.Level.Numbers[ulevel];
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}
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} else {
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level = this.level;
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}
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params.action = action;
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this.log(level, params._message, params);
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},
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log(level, string, params) {
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if (this.level > level)
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return;
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// Hold off on creating the message object until we actually have
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// an appender that's responsible.
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let message;
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let appenders = this.appenders;
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for (let appender of appenders) {
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if (appender.level > level) {
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continue;
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}
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if (!message) {
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message = new LogMessage(this._name, level, string, params);
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}
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appender.append(message);
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}
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},
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fatal(string, params) {
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this.log(Log.Level.Fatal, string, params);
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},
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error(string, params) {
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this.log(Log.Level.Error, string, params);
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},
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warn(string, params) {
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this.log(Log.Level.Warn, string, params);
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},
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info(string, params) {
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this.log(Log.Level.Info, string, params);
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},
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config(string, params) {
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this.log(Log.Level.Config, string, params);
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},
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debug(string, params) {
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this.log(Log.Level.Debug, string, params);
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},
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trace(string, params) {
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this.log(Log.Level.Trace, string, params);
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}
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};
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/*
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* LoggerRepository
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* Implements a hierarchy of Loggers
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*/
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function LoggerRepository() {}
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LoggerRepository.prototype = {
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_loggers: {},
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_rootLogger: null,
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get rootLogger() {
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if (!this._rootLogger) {
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this._rootLogger = new Logger("root", this);
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this._rootLogger.level = Log.Level.All;
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}
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return this._rootLogger;
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},
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set rootLogger(logger) {
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throw "Cannot change the root logger";
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},
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_updateParents: function LogRep__updateParents(name) {
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let pieces = name.split(".");
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let cur, parent;
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// find the closest parent
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// don't test for the logger name itself, as there's a chance it's already
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// there in this._loggers
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for (let i = 0; i < pieces.length - 1; i++) {
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if (cur)
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cur += "." + pieces[i];
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else
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cur = pieces[i];
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if (cur in this._loggers)
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parent = cur;
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}
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// if we didn't assign a parent above, there is no parent
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if (!parent)
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this._loggers[name].parent = this.rootLogger;
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else
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this._loggers[name].parent = this._loggers[parent];
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// trigger updates for any possible descendants of this logger
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for (let logger in this._loggers) {
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if (logger != name && logger.indexOf(name) == 0)
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this._updateParents(logger);
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}
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},
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/**
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* Obtain a named Logger.
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*
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* The returned Logger instance for a particular name is shared among
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* all callers. In other words, if two consumers call getLogger("foo"),
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* they will both have a reference to the same object.
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*
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* @return Logger
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*/
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getLogger(name) {
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if (name in this._loggers)
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return this._loggers[name];
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this._loggers[name] = new Logger(name, this);
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this._updateParents(name);
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return this._loggers[name];
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},
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/**
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* Obtain a Logger that logs all string messages with a prefix.
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*
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* A common pattern is to have separate Logger instances for each instance
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* of an object. But, you still want to distinguish between each instance.
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* Since Log.repository.getLogger() returns shared Logger objects,
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* monkeypatching one Logger modifies them all.
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*
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* This function returns a new object with a prototype chain that chains
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* up to the original Logger instance. The new prototype has log functions
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* that prefix content to each message.
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*
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* @param name
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* (string) The Logger to retrieve.
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* @param prefix
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* (string) The string to prefix each logged message with.
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*/
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getLoggerWithMessagePrefix(name, prefix) {
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let log = this.getLogger(name);
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let proxy = Object.create(log);
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proxy.log = (level, string, params) => log.log(level, prefix + string, params);
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return proxy;
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},
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};
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/*
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* Formatters
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* These massage a LogMessage into whatever output is desired.
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* BasicFormatter and StructuredFormatter are implemented here.
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*/
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// Abstract formatter
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function Formatter() {}
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Formatter.prototype = {
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format: function Formatter_format(message) {}
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};
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// Basic formatter that doesn't do anything fancy.
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function BasicFormatter(dateFormat) {
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if (dateFormat) {
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this.dateFormat = dateFormat;
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}
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this.parameterFormatter = new ParameterFormatter();
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}
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BasicFormatter.prototype = {
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__proto__: Formatter.prototype,
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/**
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* Format the text of a message with optional parameters.
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* If the text contains ${identifier}, replace that with
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* the value of params[identifier]; if ${}, replace that with
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* the entire params object. If no params have been substituted
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* into the text, format the entire object and append that
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* to the message.
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*/
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formatText(message) {
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let params = message.params;
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if (typeof(params) == "undefined") {
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return message.message || "";
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}
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// Defensive handling of non-object params
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// We could add a special case for NSRESULT values here...
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let pIsObject = (typeof(params) == "object" || typeof(params) == "function");
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// if we have params, try and find substitutions.
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if (this.parameterFormatter) {
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// have we successfully substituted any parameters into the message?
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// in the log message
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let subDone = false;
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let regex = /\$\{(\S*)\}/g;
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let textParts = [];
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if (message.message) {
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textParts.push(message.message.replace(regex, (_, sub) => {
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// ${foo} means use the params['foo']
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if (sub) {
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if (pIsObject && sub in message.params) {
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subDone = true;
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return this.parameterFormatter.format(message.params[sub]);
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}
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return "${" + sub + "}";
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}
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// ${} means use the entire params object.
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subDone = true;
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return this.parameterFormatter.format(message.params);
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}));
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}
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if (!subDone) {
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// There were no substitutions in the text, so format the entire params object
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|
let rest = this.parameterFormatter.format(message.params);
|
|
if (rest !== null && rest != "{}") {
|
|
textParts.push(rest);
|
|
}
|
|
}
|
|
return textParts.join(": ");
|
|
}
|
|
return undefined;
|
|
},
|
|
|
|
format: function BF_format(message) {
|
|
return message.time + "\t" +
|
|
message.loggerName + "\t" +
|
|
message.levelDesc + "\t" +
|
|
this.formatText(message);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* A formatter that only formats the string message component.
|
|
*/
|
|
function MessageOnlyFormatter() {
|
|
}
|
|
MessageOnlyFormatter.prototype = Object.freeze({
|
|
__proto__: Formatter.prototype,
|
|
|
|
format(message) {
|
|
return message.message;
|
|
},
|
|
});
|
|
|
|
// Structured formatter that outputs JSON based on message data.
|
|
// This formatter will format unstructured messages by supplying
|
|
// default values.
|
|
function StructuredFormatter() { }
|
|
StructuredFormatter.prototype = {
|
|
__proto__: Formatter.prototype,
|
|
|
|
format(logMessage) {
|
|
let output = {
|
|
_time: logMessage.time,
|
|
_namespace: logMessage.loggerName,
|
|
_level: logMessage.levelDesc
|
|
};
|
|
|
|
for (let key in logMessage.params) {
|
|
output[key] = logMessage.params[key];
|
|
}
|
|
|
|
if (!output.action) {
|
|
output.action = "UNKNOWN";
|
|
}
|
|
|
|
if (!output._message && logMessage.message) {
|
|
output._message = logMessage.message;
|
|
}
|
|
|
|
return JSON.stringify(output);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Test an object to see if it is a Mozilla JS Error.
|
|
*/
|
|
function isError(aObj) {
|
|
return (aObj && typeof(aObj) == "object" && "name" in aObj && "message" in aObj &&
|
|
"fileName" in aObj && "lineNumber" in aObj && "stack" in aObj);
|
|
}
|
|
|
|
/*
|
|
* Parameter Formatters
|
|
* These massage an object used as a parameter for a LogMessage into
|
|
* a string representation of the object.
|
|
*/
|
|
|
|
function ParameterFormatter() {
|
|
this._name = "ParameterFormatter"
|
|
}
|
|
ParameterFormatter.prototype = {
|
|
format(ob) {
|
|
try {
|
|
if (ob === undefined) {
|
|
return "undefined";
|
|
}
|
|
if (ob === null) {
|
|
return "null";
|
|
}
|
|
// Pass through primitive types and objects that unbox to primitive types.
|
|
if ((typeof(ob) != "object" || typeof(ob.valueOf()) != "object") &&
|
|
typeof(ob) != "function") {
|
|
return ob;
|
|
}
|
|
if (ob instanceof Ci.nsIException) {
|
|
return ob.toString() + " " + Log.stackTrace(ob);
|
|
} else if (isError(ob)) {
|
|
return Log._formatError(ob);
|
|
}
|
|
// Just JSONify it. Filter out our internal fields and those the caller has
|
|
// already handled.
|
|
return JSON.stringify(ob, (key, val) => {
|
|
if (INTERNAL_FIELDS.has(key)) {
|
|
return undefined;
|
|
}
|
|
return val;
|
|
});
|
|
} catch (e) {
|
|
dumpError("Exception trying to format object for log message: " + Log.exceptionStr(e));
|
|
}
|
|
// Fancy formatting failed. Just toSource() it - but even this may fail!
|
|
try {
|
|
return ob.toSource();
|
|
} catch (_) { }
|
|
try {
|
|
return "" + ob;
|
|
} catch (_) {
|
|
return "[object]"
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Appenders
|
|
* These can be attached to Loggers to log to different places
|
|
* Simply subclass and override doAppend to implement a new one
|
|
*/
|
|
|
|
function Appender(formatter) {
|
|
this._name = "Appender";
|
|
this._formatter = formatter ? formatter : new BasicFormatter();
|
|
}
|
|
Appender.prototype = {
|
|
level: Log.Level.All,
|
|
|
|
append: function App_append(message) {
|
|
if (message) {
|
|
this.doAppend(this._formatter.format(message));
|
|
}
|
|
},
|
|
toString: function App_toString() {
|
|
return this._name + " [level=" + this.level +
|
|
", formatter=" + this._formatter + "]";
|
|
},
|
|
doAppend: function App_doAppend(formatted) {}
|
|
};
|
|
|
|
/*
|
|
* DumpAppender
|
|
* Logs to standard out
|
|
*/
|
|
|
|
function DumpAppender(formatter) {
|
|
Appender.call(this, formatter);
|
|
this._name = "DumpAppender";
|
|
}
|
|
DumpAppender.prototype = {
|
|
__proto__: Appender.prototype,
|
|
|
|
doAppend: function DApp_doAppend(formatted) {
|
|
dump(formatted + "\n");
|
|
}
|
|
};
|
|
|
|
/*
|
|
* ConsoleAppender
|
|
* Logs to the javascript console
|
|
*/
|
|
|
|
function ConsoleAppender(formatter) {
|
|
Appender.call(this, formatter);
|
|
this._name = "ConsoleAppender";
|
|
}
|
|
ConsoleAppender.prototype = {
|
|
__proto__: Appender.prototype,
|
|
|
|
// XXX this should be replaced with calls to the Browser Console
|
|
append: function App_append(message) {
|
|
if (message) {
|
|
let m = this._formatter.format(message);
|
|
if (message.level > Log.Level.Warn) {
|
|
Cu.reportError(m);
|
|
return;
|
|
}
|
|
this.doAppend(m);
|
|
}
|
|
},
|
|
|
|
doAppend: function CApp_doAppend(formatted) {
|
|
Cc["@mozilla.org/consoleservice;1"].
|
|
getService(Ci.nsIConsoleService).logStringMessage(formatted);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Append to an nsIStorageStream
|
|
*
|
|
* This writes logging output to an in-memory stream which can later be read
|
|
* back as an nsIInputStream. It can be used to avoid expensive I/O operations
|
|
* during logging. Instead, one can periodically consume the input stream and
|
|
* e.g. write it to disk asynchronously.
|
|
*/
|
|
function StorageStreamAppender(formatter) {
|
|
Appender.call(this, formatter);
|
|
this._name = "StorageStreamAppender";
|
|
}
|
|
|
|
StorageStreamAppender.prototype = {
|
|
__proto__: Appender.prototype,
|
|
|
|
_converterStream: null, // holds the nsIConverterOutputStream
|
|
_outputStream: null, // holds the underlying nsIOutputStream
|
|
|
|
_ss: null,
|
|
|
|
get outputStream() {
|
|
if (!this._outputStream) {
|
|
// First create a raw stream. We can bail out early if that fails.
|
|
this._outputStream = this.newOutputStream();
|
|
if (!this._outputStream) {
|
|
return null;
|
|
}
|
|
|
|
// Wrap the raw stream in an nsIConverterOutputStream. We can reuse
|
|
// the instance if we already have one.
|
|
if (!this._converterStream) {
|
|
this._converterStream = Cc["@mozilla.org/intl/converter-output-stream;1"]
|
|
.createInstance(Ci.nsIConverterOutputStream);
|
|
}
|
|
this._converterStream.init(this._outputStream, "UTF-8");
|
|
}
|
|
return this._converterStream;
|
|
},
|
|
|
|
newOutputStream: function newOutputStream() {
|
|
let ss = this._ss = Cc["@mozilla.org/storagestream;1"]
|
|
.createInstance(Ci.nsIStorageStream);
|
|
ss.init(STREAM_SEGMENT_SIZE, PR_UINT32_MAX, null);
|
|
return ss.getOutputStream(0);
|
|
},
|
|
|
|
getInputStream: function getInputStream() {
|
|
if (!this._ss) {
|
|
return null;
|
|
}
|
|
return this._ss.newInputStream(0);
|
|
},
|
|
|
|
reset: function reset() {
|
|
if (!this._outputStream) {
|
|
return;
|
|
}
|
|
this.outputStream.close();
|
|
this._outputStream = null;
|
|
this._ss = null;
|
|
},
|
|
|
|
doAppend(formatted) {
|
|
if (!formatted) {
|
|
return;
|
|
}
|
|
try {
|
|
this.outputStream.writeString(formatted + "\n");
|
|
} catch (ex) {
|
|
if (ex.result == Cr.NS_BASE_STREAM_CLOSED) {
|
|
// The underlying output stream is closed, so let's open a new one
|
|
// and try again.
|
|
this._outputStream = null;
|
|
} try {
|
|
this.outputStream.writeString(formatted + "\n");
|
|
} catch (ex) {
|
|
// Ah well, we tried, but something seems to be hosed permanently.
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* File appender
|
|
*
|
|
* Writes output to file using OS.File.
|
|
*/
|
|
function FileAppender(path, formatter) {
|
|
Appender.call(this, formatter);
|
|
this._name = "FileAppender";
|
|
this._encoder = new TextEncoder();
|
|
this._path = path;
|
|
this._file = null;
|
|
this._fileReadyPromise = null;
|
|
|
|
// This is a promise exposed for testing/debugging the logger itself.
|
|
this._lastWritePromise = null;
|
|
}
|
|
|
|
FileAppender.prototype = {
|
|
__proto__: Appender.prototype,
|
|
|
|
_openFile() {
|
|
return (async () => {
|
|
try {
|
|
this._file = await OS.File.open(this._path,
|
|
{truncate: true});
|
|
} catch (err) {
|
|
if (err instanceof OS.File.Error) {
|
|
this._file = null;
|
|
} else {
|
|
throw err;
|
|
}
|
|
}
|
|
})();
|
|
},
|
|
|
|
_getFile() {
|
|
if (!this._fileReadyPromise) {
|
|
this._fileReadyPromise = this._openFile();
|
|
}
|
|
|
|
return this._fileReadyPromise;
|
|
},
|
|
|
|
doAppend(formatted) {
|
|
let array = this._encoder.encode(formatted + "\n");
|
|
if (this._file) {
|
|
this._lastWritePromise = this._file.write(array);
|
|
} else {
|
|
this._lastWritePromise = this._getFile().then(_ => {
|
|
this._fileReadyPromise = null;
|
|
if (this._file) {
|
|
return this._file.write(array);
|
|
}
|
|
return undefined;
|
|
});
|
|
}
|
|
},
|
|
|
|
reset() {
|
|
let fileClosePromise = this._file.close();
|
|
return fileClosePromise.then(_ => {
|
|
this._file = null;
|
|
return OS.File.remove(this._path);
|
|
});
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Bounded File appender
|
|
*
|
|
* Writes output to file using OS.File. After the total message size
|
|
* (as defined by formatted.length) exceeds maxSize, existing messages
|
|
* will be discarded, and subsequent writes will be appended to a new log file.
|
|
*/
|
|
function BoundedFileAppender(path, formatter, maxSize = 2 * ONE_MEGABYTE) {
|
|
FileAppender.call(this, path, formatter);
|
|
this._name = "BoundedFileAppender";
|
|
this._size = 0;
|
|
this._maxSize = maxSize;
|
|
this._closeFilePromise = null;
|
|
}
|
|
|
|
BoundedFileAppender.prototype = {
|
|
__proto__: FileAppender.prototype,
|
|
|
|
doAppend(formatted) {
|
|
if (!this._removeFilePromise) {
|
|
if (this._size < this._maxSize) {
|
|
this._size += formatted.length;
|
|
return FileAppender.prototype.doAppend.call(this, formatted);
|
|
}
|
|
this._removeFilePromise = this.reset();
|
|
}
|
|
this._removeFilePromise.then(_ => {
|
|
this._removeFilePromise = null;
|
|
this.doAppend(formatted);
|
|
});
|
|
return undefined;
|
|
},
|
|
|
|
reset() {
|
|
let fileClosePromise;
|
|
if (this._fileReadyPromise) {
|
|
// An attempt to open the file may still be in progress.
|
|
fileClosePromise = this._fileReadyPromise.then(_ => {
|
|
return this._file.close();
|
|
});
|
|
} else {
|
|
fileClosePromise = this._file.close();
|
|
}
|
|
|
|
return fileClosePromise.then(_ => {
|
|
this._size = 0;
|
|
this._file = null;
|
|
return OS.File.remove(this._path);
|
|
});
|
|
}
|
|
};
|