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bunyan

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bunyan - npm Package Compare versions

Comparing version

0.2.0
to
0.3.0

tools/timechild.js

18

CHANGES.md
# bunyan Changelog
## bunyan 0.3.0
- `log.child(options[, simple])` Added `simple` boolean arg. Set `true` to
assert that options only add fields (no config changes). Results in a 10x
speed increase in child creation. See "tools/timechild.js". On my Mac,
"fast child" creation takes about 0.001ms. IOW, if your app is dishing
10,000 req/s, then creating a log child for each request will take
about 1% of the request time.
- `log.clone` -> `log.child` to better reflect the relationship: streams and
serializers are inherited. Streams can't be removed as part of the child
creation. The child doesn't own the parent's streams (so can't close them).
- Clean up Logger creation. The goal here was to ensure `log.child` usage
is fast. TODO: measure that.
- Add `Logger.stdSerializers.err` serializer which is necessary to get good
Error object logging with node 0.6 (where core Error object properties
are non-enumerable).
## bunyan 0.2.0

@@ -4,0 +22,0 @@

5

examples/err.js

@@ -5,2 +5,3 @@ // Example logging an error:

var Logger = require('../lib/bunyan');
var util = require('util');

@@ -10,4 +11,3 @@ var log = new Logger({

serializers: {
req: Logger.stdSerializers.req,
res: Logger.stdSerializers.res
err: Logger.stdSerializers.err, // <--- use this
}

@@ -30,2 +30,3 @@ });

"stack": "TypeError: boom\n at Object.<anonymous> (/Users/trentm/tm/node-bunyan/examples/err.js:15:9)\n at Module._compile (module.js:411:26)\n at Object..js (module.js:417:10)\n at Module.load (module.js:343:31)\n at Function._load (module.js:302:12)\n at Array.0 (module.js:430:10)\n at EventEmitter._tickCallback (node.js:126:26)",
"name": "TypeError",
"message": "boom"

@@ -32,0 +33,0 @@ },

4

examples/hi.js

@@ -18,3 +18,3 @@ var Logger = require('../lib/bunyan');

// Shows `log.clone(...)` to specialize a logger for a sub-component.
// Shows `log.child(...)` to specialize a logger for a sub-component.
console.log("\n\n")

@@ -31,5 +31,5 @@

var wuzzle = new Wuzzle({log: log.clone({component: "wuzzle"})});
var wuzzle = new Wuzzle({log: log.child({component: "wuzzle"})});
wuzzle.woos();
log.info("done with the wuzzle")

369

lib/bunyan.js

@@ -5,3 +5,3 @@ /*

var VERSION = "0.2.0";
var VERSION = "0.3.0";

@@ -32,7 +32,13 @@ // Bunyan log format version. This becomes the 'v' field on all log records.

function objCopy(obj) {
var copy = {};
Object.keys(obj).forEach(function (k) {
copy[k] = obj[k];
});
return copy;
if (obj === null) {
return null;
} else if (Array.isArray(obj)) {
return obj.slice();
} else {
var copy = {};
Object.keys(obj).forEach(function (k) {
copy[k] = obj[k];
});
return copy;
}
}

@@ -101,6 +107,10 @@

function getLevel(nameOrNum) {
return (typeof(nameOrNum) === 'string'
function resolveLevel(nameOrNum) {
var level = (typeof(nameOrNum) === 'string'
? levelFromName[nameOrNum]
: nameOrNum);
if (! (TRACE <= level && level <= FATAL)) {
throw new Error('invalid level: ' + nameOrNum);
}
return level;
}

@@ -116,125 +126,141 @@

* @param options {Object} See documentation for full details. At minimum
* this must include a "service" string key.
* @param _newCloneKeys {Array} Internal var. Should not be used externally.
* Array of new keys for this clone. This is necessary to assist with
* applying necessary serializers to the new keys.
* this must include a "service" string key. Configuration keys:
* - streams: specify the logger output streams. This is an array of
* objects of the form:
* {
* "level": "info", // optional, "info" default
* "stream": process.stdout, // "stream" or "path" is required
* "closeOnExit": false // optional, default depends
* }
* See README.md for full details.
* - `level`: set the level for a single output stream (cannot be used
* with `streams`)
* - `stream`: the output stream for a logger with just one, e.g.
* `process.stdout` (cannot be used with `streams`)
* - `serializers`: object mapping log record field names to
* serializing functions. See README.md for details.
* All other keys are log record fields.
*
* An alternative *internal* call signature is used for creating a child:
* new Logger(<parent logger>, <child options>[, <child opts are simple>]);
*
* @param _childSimple (Boolean) An assertion that the given `_childOptions`
* (a) only add fields (no config) and (b) no serialization handling is
* required for them. IOW, this is a fast path for frequent child
* creation.
*/
function Logger(options, _newCloneKeys) {
function Logger(options, _childOptions, _childSimple) {
xxx('Logger start:', options)
if (! this instanceof Logger) {
return new Logger(options);
return new Logger(options, _childOptions);
}
var self = this;
// Input arg validation.
var parent;
if (_childOptions !== undefined) {
parent = options;
options = _childOptions;
if (! parent instanceof Logger) {
throw new TypeError('invalid Logger creation: do not pass a second arg');
}
}
if (!options) {
throw new TypeError('options (object) is required');
}
if (options.stream && options.streams) {
throw new TypeError('can only have one of "stream" or "streams"');
if ((options.stream || options.level) && options.streams) {
throw new TypeError('cannot mix "streams" with "stream" or "level" options');
}
if (_newCloneKeys && !Array.isArray(_newCloneKeys)) {
throw new TypeError('_newCloneKeys (Array) is an internal var');
}
// These are the default fields for log records (minus the attributes
// removed in this constructor). To allow storing raw log records
// (unrendered), `this.fields` must never be mutated. Create a copy for
// any changes.
this.fields = objCopy(options);
// Extract and setup the configuration options (the remaining ones are
// log record fields).
var lowestLevel = Number.POSITIVE_INFINITY;
var level;
if (options.level) {
level = getLevel(options.level);
if (! (TRACE <= level && level <= FATAL)) {
throw new Error('invalid level: ' + options.level);
// Fast path for simple child creation.
if (parent && _childSimple) {
// Single to stream close handling that this child owns none of its
// streams.
this._isSimpleChild = true;
this.level = parent.level;
this.streams = parent.streams;
this.serializers = parent.serializers;
this.fields = parent.fields;
var names = Object.keys(options);
for (var i = 0; i < names.length; i++) {
var name = names[i];
this.fields[name] = options[name];
}
delete this.fields.level;
} else {
level = INFO;
return;
}
this.streams = [];
if (options.stream) {
this.streams.push({
type: "stream",
stream: options.stream,
closeOnExit: false,
level: level
});
if (level < lowestLevel) {
lowestLevel = level;
// Null values.
var self = this;
if (parent) {
this.level = parent.level;
this.streams = [];
for (var i = 0; i < parent.streams.length; i++) {
var s = objCopy(parent.streams[i]);
s.closeOnExit = false; // Don't own parent stream.
this.streams.push(s);
}
delete this.fields.stream;
} else if (options.streams) {
options.streams.forEach(function (s) {
s = objCopy(s);
this.serializers = objCopy(parent.serializers);
this.fields = objCopy(parent.fields);
} else {
this.level = Number.POSITIVE_INFINITY;
this.streams = [];
this.serializers = null;
this.fields = {};
}
// Helpers
function addStream(s) {
s = objCopy(s);
// Implicit 'type' from other args.
type = s.type;
if (!s.type) {
if (s.stream) {
s.type = "stream";
} else if (s.path) {
s.type = "file"
}
// Implicit 'type' from other args.
type = s.type;
if (!s.type) {
if (s.stream) {
s.type = "stream";
} else if (s.path) {
s.type = "file"
}
}
if (s.level) {
s.level = getLevel(s.level);
} else {
s.level = level;
}
if (s.level < lowestLevel) {
lowestLevel = s.level;
if (s.level) {
s.level = resolveLevel(s.level);
} else {
s.level = INFO;
}
if (s.level < self.level) {
self.level = s.level;
}
switch (s.type) {
case "stream":
if (!s.closeOnExit) {
s.closeOnExit = false;
}
switch (s.type) {
case "stream":
break;
case "file":
if (!s.stream) {
s.stream = fs.createWriteStream(s.path,
{flags: 'a', encoding: 'utf8'});
if (!s.closeOnExit) {
s.closeOnExit = true;
}
} else {
if (!s.closeOnExit) {
s.closeOnExit = false;
}
break;
case "file":
if (!s.stream) {
s.stream = fs.createWriteStream(s.path,
{flags: 'a', encoding: 'utf8'});
if (!s.closeOnExit) {
s.closeOnExit = true;
}
} else {
if (!s.closeOnExit) {
s.closeOnExit = false;
}
}
break;
default:
throw new TypeError('unknown stream type "' + s.type + '"');
}
break;
default:
throw new TypeError('unknown stream type "' + s.type + '"');
}
self.streams.push(s);
});
delete this.fields.streams;
} else {
this.streams.push({
type: "stream",
stream: process.stdout,
closeOnExit: false,
level: level
});
if (level < lowestLevel) {
lowestLevel = level;
self.streams.push(s);
}
function addSerializers(serializers) {
if (!self.serializers) {
self.serializers = {};
}
}
this.level = lowestLevel;
delete this.fields.serializers;
if (!options.serializers) {
this.serializers = null;
} else {
this.serializers = {};
Object.keys(options.serializers).forEach(function (field) {
var serializer = options.serializers[field];
Object.keys(serializers).forEach(function (field) {
var serializer = serializers[field];
if (typeof(serializer) !== "function") {

@@ -248,30 +274,45 @@ throw new TypeError(format(

}
// Handle *config* options.
if (options.stream) {
addStream({
type: "stream",
stream: options.stream,
closeOnExit: false,
level: (options.level ? resolveLevel(options.level) : INFO)
});
} else if (options.streams) {
options.streams.forEach(addStream);
} else if (!parent) {
addStream({
type: "stream",
stream: process.stdout,
closeOnExit: false,
level: (options.level ? resolveLevel(options.level) : INFO)
});
}
if (options.serializers) {
addSerializers(options.serializers);
}
xxx("Logger: ", self)
// Apply serializers to initial fields.
// Fields.
// These are the default fields for log records (minus the attributes
// removed in this constructor). To allow storing raw log records
// (unrendered), `this.fields` must never be mutated. Create a copy for
// any changes.
var fields = objCopy(options);
delete fields.stream;
delete fields.level;
delete fields.streams;
delete fields.serializers;
if (this.serializers) {
if (_newCloneKeys && _newCloneKeys.length > 0) {
// Note that this includes *config* vars send to `log.clone()` in
// addition to log record *fields*, so the impl. needs to handle that.
this._applySerializers(this.fields, _newCloneKeys);
} else {
this._applySerializers(this.fields);
}
this._applySerializers(fields);
}
// Automatic fields.
if (!this.fields.hostname) {
this.fields.hostname = os.hostname();
if (!fields.hostname) {
fields.hostname = os.hostname();
}
//XXX Turn this on or ditch it.
//process.on('exit', function () {
// self.streams.forEach(function (s) {
// if (s.closeOnExit) {
// xxx("closing stream s:", s);
// s.stream.end();
// }
// });
//});
Object.keys(fields).forEach(function (k) {
self.fields[k] = fields[k];
});
}

@@ -281,4 +322,3 @@

/**
* Clone this logger to a new one, additionally adding the given config
* options.
* Create a child logger, typically to add a few log record fields.
*

@@ -288,3 +328,3 @@ * This can be useful when passing a logger to a sub-component, e.g. a

*
* var wuzzleLog = log.clone({component: "wuzzle"})
* var wuzzleLog = log.child({component: "wuzzle"})
* var wuzzle = new Wuzzle({..., log: wuzzleLog})

@@ -295,18 +335,41 @@ *

*
* @param options {Object} Optional. Set of options to apply to the clone.
* Supports the same set of options as the constructor.
* @param options {Object} Optional. Set of options to apply to the child.
* All of the same options for a new Logger apply here. Notes:
* - The parent's streams are inherited and cannot be removed in this
* call.
* - The parent's serializers are inherited, though can effectively be
* overwritten by using duplicate keys.
* @param simple {Boolean} Optional. Set to true to assert that `options`
* (a) only add fields (no config) and (b) no serialization handling is
* required for them. IOW, this is a fast path for frequent child
* creation. See "tools/timechild.js" for numbers.
*/
Logger.prototype.clone = function (options) {
var cloneOptions = objCopy(this.fields);
cloneOptions.streams = this.streams;
if (options) {
var newCloneKeys = Object.keys(options);
newCloneKeys.forEach(function(k) {
cloneOptions[k] = options[k];
});
}
return new Logger(cloneOptions, newCloneKeys);
Logger.prototype.child = function (options, simple) {
return new Logger(this, options || {}, simple);
}
///**
// * Close this logger.
// *
// * This closes streams (that it owns, as per "endOnClose" attributes on
// * streams), etc. Typically you **don't** need to bother calling this.
// */
//Logger.prototype.close = function () {
// if (this._closed) {
// return;
// }
// if (!this._isSimpleChild) {
// self.streams.forEach(function (s) {
// if (s.endOnClose) {
// xxx("closing stream s:", s);
// s.stream.end();
// s.endOnClose = false;
// }
// });
// }
// this._closed = true;
//}
/**

@@ -618,4 +681,20 @@ * Apply registered serializers to the appropriate keys in the given fields.

// Serialize an Error object
// (Core error properties are enumerable in node 0.4, not in 0.6).
Logger.stdSerializers.err = function err(err) {
var obj = {
message: err.message,
name: err.name,
stack: err.stack
}
Object.keys(err).forEach(function (k) {
if (err[k] !== undefined) {
obj[k] = err[k];
}
});
return obj;
};
//---- Exports

@@ -622,0 +701,0 @@

2

package.json
{
"name": "bunyan",
"version": "0.2.0",
"version": "0.3.0",
"description": "a JSON Logger library for node.js servers",

@@ -5,0 +5,0 @@ "main": "./lib/bunyan.js",

22

README.md

@@ -76,3 +76,3 @@ Bunyan -- a JSON Logger for node.js servers.

A **`log.clone(...)`** is provided to specialize a logger for a sub-component.
A **`log.child(...)`** is provided to specialize a logger for a sub-component.
The following will have log records from "Wuzzle" instances use exactly the

@@ -93,3 +93,3 @@ same config as its parent, plus include the "component" field.

var wuzzle = new Wuzzle({log: log.clone({component: "wuzzle"})});
var wuzzle = new Wuzzle({log: log.child({component: "wuzzle"})});
wuzzle.woos();

@@ -99,2 +99,16 @@ log.info("done with the wuzzle")

An example and a hack: The [node-restify](https://github.com/mcavage/node-restify)
framework integrates bunyan. One feature is that each restify request handler
includes a `req.log` logger that is a:
log.child({req_id: <unique request id>}, true)
Apps using restify can then use `req.log` and have all such log records
include the unique request id (as "req_id"). Handy. *What is that `true`?* It
is a small bunyan hack by which you can assert that you're just adding
simple fields to the child logger. This makes `log.child` 10x faster and,
hence, never a worry for slowing down HTTP request handling. See the
changelog for node-bunyan 0.3.0 for details.
Back to the `log.{trace|debug|...|fatal}(...)` API:

@@ -261,4 +275,4 @@

- `err`: Object. A caught JS exception. Log that thing with
`log.error({err: err}, "oops")`! JS exceptions `JSON.stringify` quite
nicely so you don't need to do anything else. See "examples/err.js".
`log.error({err: err}, "oops")` and **use the `Logger.stdSerializers.err`**
serializer for it. See "examples/err.js".
- `req_id`: String. A request identifier. Including this field in all logging

@@ -265,0 +279,0 @@ tied to handling a particular request to your server is strongly suggested.

14

TODO.md

@@ -1,10 +0,4 @@

- expand set of fields: from dap
time, hostname
<https://github.com/Graylog2/graylog2-docs/wiki/GELF>
<http://journal.paul.querna.org/articles/2011/12/26/log-for-machines-in-json/>
require: facility and hostname
line/file: possible to get quickly with v8? Yunong asked.
- fast clone: basically make it reasonable to clone per HTTP request.
Ditch mutability. Add another context (another entry in Log record tuple?)?
- `log.close` to close streams and shutdown and `this.closed`
- line/file: possible to get quickly with v8? Yunong asked.
- what's the API for changing the logger/stream level(s)?
- bunyan cli: more layouts (http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/EnhancedPatternLayout.html)

@@ -31,4 +25,2 @@ Custom log formats (in config file? in '-f' arg) using printf or hogan.js

else, give an index... or type ... or support stream "names".
- Logger.set to mutate config or `this.fields`
- Logger.del to remove a field
- "canWrite" handling for full streams. Need to buffer a la log4js

@@ -68,2 +60,4 @@ - test file log with logadm rotation: does it handle that?

Want some way to have file/line only at certain levesl and lazily.
- get Mark to show me dtrace provider stuff and consider adding for
logging, if helpful.
- add option to "streams" to take the raw object, not serialized.

@@ -70,0 +64,0 @@ It would be a good hook for people with custom needs that Bunyan doesn't

.npmignore

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bin/bunyan

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