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gecko-dev/toolkit/modules/Log.jsm

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JavaScript
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
this.EXPORTED_SYMBOLS = ["Log"];
const {classes: Cc, interfaces: Ci, results: Cr, utils: Cu} = Components;
const ONE_BYTE = 1;
const ONE_KILOBYTE = 1024 * ONE_BYTE;
const ONE_MEGABYTE = 1024 * ONE_KILOBYTE;
const STREAM_SEGMENT_SIZE = 4096;
const PR_UINT32_MAX = 0xffffffff;
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "OS",
"resource://gre/modules/osfile.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Task",
"resource://gre/modules/Task.jsm");
const INTERNAL_FIELDS = new Set(["_level", "_message", "_time", "_namespace"]);
/*
* Dump a message everywhere we can if we have a failure.
*/
function dumpError(text) {
dump(text + "\n");
Cu.reportError(text);
}
this.Log = {
Level: {
Fatal: 70,
Error: 60,
Warn: 50,
Info: 40,
Config: 30,
Debug: 20,
Trace: 10,
All: -1, // We don't want All to be falsy.
Desc: {
70: "FATAL",
60: "ERROR",
50: "WARN",
40: "INFO",
30: "CONFIG",
20: "DEBUG",
10: "TRACE",
"-1": "ALL",
},
Numbers: {
"FATAL": 70,
"ERROR": 60,
"WARN": 50,
"INFO": 40,
"CONFIG": 30,
"DEBUG": 20,
"TRACE": 10,
"ALL": -1,
}
},
get repository() {
delete Log.repository;
Log.repository = new LoggerRepository();
return Log.repository;
},
set repository(value) {
delete Log.repository;
Log.repository = value;
},
LogMessage: LogMessage,
Logger: Logger,
LoggerRepository: LoggerRepository,
Formatter: Formatter,
BasicFormatter: BasicFormatter,
MessageOnlyFormatter: MessageOnlyFormatter,
StructuredFormatter: StructuredFormatter,
Appender: Appender,
DumpAppender: DumpAppender,
ConsoleAppender: ConsoleAppender,
StorageStreamAppender: StorageStreamAppender,
FileAppender: FileAppender,
BoundedFileAppender: BoundedFileAppender,
ParameterFormatter: ParameterFormatter,
// Logging helper:
// let logger = Log.repository.getLogger("foo");
// logger.info(Log.enumerateInterfaces(someObject).join(","));
enumerateInterfaces: function Log_enumerateInterfaces(aObject) {
let interfaces = [];
for (i in Ci) {
try {
aObject.QueryInterface(Ci[i]);
interfaces.push(i);
}
catch(ex) {}
}
return interfaces;
},
// Logging helper:
// let logger = Log.repository.getLogger("foo");
// logger.info(Log.enumerateProperties(someObject).join(","));
enumerateProperties: function (aObject, aExcludeComplexTypes) {
let properties = [];
for (p in aObject) {
try {
if (aExcludeComplexTypes &&
(typeof(aObject[p]) == "object" || typeof(aObject[p]) == "function"))
continue;
properties.push(p + " = " + aObject[p]);
}
catch(ex) {
properties.push(p + " = " + ex);
}
}
return properties;
},
_formatError: function _formatError(e) {
let result = e.toString();
if (e.fileName) {
result += " (" + e.fileName;
if (e.lineNumber) {
result += ":" + e.lineNumber;
}
if (e.columnNumber) {
result += ":" + e.columnNumber;
}
result += ")";
}
return result + " " + Log.stackTrace(e);
},
// This is for back compatibility with services/common/utils.js; we duplicate
// some of the logic in ParameterFormatter
exceptionStr: function exceptionStr(e) {
if (!e) {
return "" + e;
}
if (e instanceof Ci.nsIException) {
return e.toString() + " " + Log.stackTrace(e);
}
else if (isError(e)) {
return Log._formatError(e);
}
// else
let message = e.message ? e.message : e;
return message + " " + Log.stackTrace(e);
},
stackTrace: function stackTrace(e) {
// Wrapped nsIException
if (e.location) {
let frame = e.location;
let output = [];
while (frame) {
// Works on frames or exceptions, munges file:// URIs to shorten the paths
// FIXME: filename munging is sort of hackish, might be confusing if
// there are multiple extensions with similar filenames
let str = "<file:unknown>";
let file = frame.filename || frame.fileName;
if (file) {
str = file.replace(/^(?:chrome|file):.*?([^\/\.]+\.\w+)$/, "$1");
}
if (frame.lineNumber) {
str += ":" + frame.lineNumber;
}
if (frame.name) {
str = frame.name + "()@" + str;
}
if (str) {
output.push(str);
}
frame = frame.caller;
}
return "Stack trace: " + output.join(" < ");
}
// Standard JS exception
if (e.stack) {
return "JS Stack trace: " + Task.Debugging.generateReadableStack(e.stack).trim()
.replace(/\n/g, " < ").replace(/@[^@]*?([^\/\.]+\.\w+:)/g, "@$1");
}
return "No traceback available";
}
};
/*
* LogMessage
* Encapsulates a single log event's data
*/
function LogMessage(loggerName, level, message, params) {
this.loggerName = loggerName;
this.level = level;
/*
* Special case to handle "log./level/(object)", for example logging a caught exception
* without providing text or params like: catch(e) { logger.warn(e) }
* Treating this as an empty text with the object in the 'params' field causes the
* object to be formatted properly by BasicFormatter.
*/
if (!params && message && (typeof(message) == "object") &&
(typeof(message.valueOf()) != "string")) {
this.message = null;
this.params = message;
} else {
// If the message text is empty, or a string, or a String object, normal handling
this.message = message;
this.params = params;
}
// The _structured field will correspond to whether this message is to
// be interpreted as a structured message.
this._structured = this.params && this.params.action;
this.time = Date.now();
}
LogMessage.prototype = {
get levelDesc() {
if (this.level in Log.Level.Desc)
return Log.Level.Desc[this.level];
return "UNKNOWN";
},
toString: function LogMsg_toString() {
let msg = "LogMessage [" + this.time + " " + this.level + " " +
this.message;
if (this.params) {
msg += " " + JSON.stringify(this.params);
}
return msg + "]"
}
};
/*
* Logger
* Hierarchical version. Logs to all appenders, assigned or inherited
*/
function Logger(name, repository) {
if (!repository)
repository = Log.repository;
this._name = name;
this.children = [];
this.ownAppenders = [];
this.appenders = [];
this._repository = repository;
}
Logger.prototype = {
get name() {
return this._name;
},
_level: null,
get level() {
if (this._level != null)
return this._level;
if (this.parent)
return this.parent.level;
dumpError("Log warning: root logger configuration error: no level defined");
return Log.Level.All;
},
set level(level) {
this._level = level;
},
_parent: null,
get parent() {
return this._parent;
},
set parent(parent) {
if (this._parent == parent) {
return;
}
// Remove ourselves from parent's children
if (this._parent) {
let index = this._parent.children.indexOf(this);
if (index != -1) {
this._parent.children.splice(index, 1);
}
}
this._parent = parent;
parent.children.push(this);
this.updateAppenders();
},
updateAppenders: function updateAppenders() {
if (this._parent) {
let notOwnAppenders = this._parent.appenders.filter(function(appender) {
return this.ownAppenders.indexOf(appender) == -1;
}, this);
this.appenders = notOwnAppenders.concat(this.ownAppenders);
} else {
this.appenders = this.ownAppenders.slice();
}
// Update children's appenders.
for (let i = 0; i < this.children.length; i++) {
this.children[i].updateAppenders();
}
},
addAppender: function Logger_addAppender(appender) {
if (this.ownAppenders.indexOf(appender) != -1) {
return;
}
this.ownAppenders.push(appender);
this.updateAppenders();
},
removeAppender: function Logger_removeAppender(appender) {
let index = this.ownAppenders.indexOf(appender);
if (index == -1) {
return;
}
this.ownAppenders.splice(index, 1);
this.updateAppenders();
},
/**
* Logs a structured message object.
*
* @param action
* (string) A message action, one of a set of actions known to the
* log consumer.
* @param params
* (object) Parameters to be included in the message.
* If _level is included as a key and the corresponding value
* is a number or known level name, the message will be logged
* at the indicated level. If _message is included as a key, the
* value is used as the descriptive text for the message.
*/
logStructured: function (action, params) {
if (!action) {
throw "An action is required when logging a structured message.";
}
if (!params) {
return this.log(this.level, undefined, {"action": action});
}
if (typeof(params) != "object") {
throw "The params argument is required to be an object.";
}
let level = params._level;
if (level) {
let ulevel = level.toUpperCase();
if (ulevel in Log.Level.Numbers) {
level = Log.Level.Numbers[ulevel];
}
} else {
level = this.level;
}
params.action = action;
this.log(level, params._message, params);
},
log: function (level, string, params) {
if (this.level > level)
return;
// Hold off on creating the message object until we actually have
// an appender that's responsible.
let message;
let appenders = this.appenders;
for (let appender of appenders) {
if (appender.level > level) {
continue;
}
if (!message) {
message = new LogMessage(this._name, level, string, params);
}
appender.append(message);
}
},
fatal: function (string, params) {
this.log(Log.Level.Fatal, string, params);
},
error: function (string, params) {
this.log(Log.Level.Error, string, params);
},
warn: function (string, params) {
this.log(Log.Level.Warn, string, params);
},
info: function (string, params) {
this.log(Log.Level.Info, string, params);
},
config: function (string, params) {
this.log(Log.Level.Config, string, params);
},
debug: function (string, params) {
this.log(Log.Level.Debug, string, params);
},
trace: function (string, params) {
this.log(Log.Level.Trace, string, params);
}
};
/*
* LoggerRepository
* Implements a hierarchy of Loggers
*/
function LoggerRepository() {}
LoggerRepository.prototype = {
_loggers: {},
_rootLogger: null,
get rootLogger() {
if (!this._rootLogger) {
this._rootLogger = new Logger("root", this);
this._rootLogger.level = Log.Level.All;
}
return this._rootLogger;
},
set rootLogger(logger) {
throw "Cannot change the root logger";
},
_updateParents: function LogRep__updateParents(name) {
let pieces = name.split('.');
let cur, parent;
// find the closest parent
// don't test for the logger name itself, as there's a chance it's already
// there in this._loggers
for (let i = 0; i < pieces.length - 1; i++) {
if (cur)
cur += '.' + pieces[i];
else
cur = pieces[i];
if (cur in this._loggers)
parent = cur;
}
// if we didn't assign a parent above, there is no parent
if (!parent)
this._loggers[name].parent = this.rootLogger;
else
this._loggers[name].parent = this._loggers[parent];
// trigger updates for any possible descendants of this logger
for (let logger in this._loggers) {
if (logger != name && logger.indexOf(name) == 0)
this._updateParents(logger);
}
},
/**
* Obtain a named Logger.
*
* The returned Logger instance for a particular name is shared among
* all callers. In other words, if two consumers call getLogger("foo"),
* they will both have a reference to the same object.
*
* @return Logger
*/
getLogger: function (name) {
if (name in this._loggers)
return this._loggers[name];
this._loggers[name] = new Logger(name, this);
this._updateParents(name);
return this._loggers[name];
},
/**
* Obtain a Logger that logs all string messages with a prefix.
*
* A common pattern is to have separate Logger instances for each instance
* of an object. But, you still want to distinguish between each instance.
* Since Log.repository.getLogger() returns shared Logger objects,
* monkeypatching one Logger modifies them all.
*
* This function returns a new object with a prototype chain that chains
* up to the original Logger instance. The new prototype has log functions
* that prefix content to each message.
*
* @param name
* (string) The Logger to retrieve.
* @param prefix
* (string) The string to prefix each logged message with.
*/
getLoggerWithMessagePrefix: function (name, prefix) {
let log = this.getLogger(name);
let proxy = Object.create(log);
proxy.log = (level, string, params) => log.log(level, prefix + string, params);
return proxy;
},
};
/*
* Formatters
* These massage a LogMessage into whatever output is desired.
* BasicFormatter and StructuredFormatter are implemented here.
*/
// Abstract formatter
function Formatter() {}
Formatter.prototype = {
format: function Formatter_format(message) {}
};
// Basic formatter that doesn't do anything fancy.
function BasicFormatter(dateFormat) {
if (dateFormat) {
this.dateFormat = dateFormat;
}
this.parameterFormatter = new ParameterFormatter();
}
BasicFormatter.prototype = {
__proto__: Formatter.prototype,
/**
* Format the text of a message with optional parameters.
* If the text contains ${identifier}, replace that with
* the value of params[identifier]; if ${}, replace that with
* the entire params object. If no params have been substituted
* into the text, format the entire object and append that
* to the message.
*/
formatText: function (message) {
let params = message.params;
if (typeof(params) == "undefined") {
return message.message || "";
}
// Defensive handling of non-object params
// We could add a special case for NSRESULT values here...
let pIsObject = (typeof(params) == 'object' || typeof(params) == 'function');
// if we have params, try and find substitutions.
if (this.parameterFormatter) {
// have we successfully substituted any parameters into the message?
// in the log message
let subDone = false;
let regex = /\$\{(\S*)\}/g;
let textParts = [];
if (message.message) {
textParts.push(message.message.replace(regex, (_, sub) => {
// ${foo} means use the params['foo']
if (sub) {
if (pIsObject && sub in message.params) {
subDone = true;
return this.parameterFormatter.format(message.params[sub]);
}
return '${' + sub + '}';
}
// ${} means use the entire params object.
subDone = true;
return this.parameterFormatter.format(message.params);
}));
}
if (!subDone) {
// There were no substitutions in the text, so format the entire params object
let rest = this.parameterFormatter.format(message.params);
if (rest !== null && rest != "{}") {
textParts.push(rest);
}
}
return textParts.join(': ');
}
},
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: function (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: function (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: function(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", STREAM_SEGMENT_SIZE,
Ci.nsIConverterInputStream.DEFAULT_REPLACEMENT_CHARACTER);
}
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: function (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: function () {
return Task.spawn(function _openFile() {
try {
this._file = yield OS.File.open(this._path,
{truncate: true});
} catch (err) {
if (err instanceof OS.File.Error) {
this._file = null;
} else {
throw err;
}
}
}.bind(this));
},
_getFile: function() {
if (!this._fileReadyPromise) {
this._fileReadyPromise = this._openFile();
}
return this._fileReadyPromise;
},
doAppend: function (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);
}
});
}
},
reset: function () {
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: function (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);
});
},
reset: function () {
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);
});
}
};
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