@@ -25,6 +25,7 @@ var os = require('os');
var fs = require ( 'fs' ) ;
var util = require ( 'util' ) ;
var assert = require ( 'assert' ) ;
var dtrace = require ( 'dtrace-provider' ) ;
var EventEmitter = require ( 'events' ) . EventEmitter ;
@@ -156,6 +157,8 @@ var levelFromName = {
'fatal' : FATAL
} ;
var dtp = undefined ;
var probes = { } ;
/**
* Resolve a level number, name (upper or lowercase) to a level number value.
@@ -299,6 +302,22 @@ function Logger(options, _childOptions, _childSimple) {
this . fields = { } ;
}
if ( !dtp ) {
dtp = dtrace . createDTraceProvider ( 'bunyan' ) ;
for ( var level in levelFromName ) {
var probe ;
probes [ levelFromName [ level ] ] = probe =
dtp . addProbe ( 'log-' + level , 'char *' ) ;
// Explicitly add a reference to dtp to prevent it from being GC'd
probe . dtp = dtp ;
}
dtp . enable ( ) ;
}
// Helpers
function addStream ( s ) {
s = objCopy ( s ) ;
@@ -641,8 +660,9 @@ Logger.prototype._mkRecord = function (fields, level, msgArgs) {
* Emit a log record.
*
* @param rec {log record }
* @param noemit {Boolean } Optional. Set to true to only return the string.
*/
Logger . prototype . _emit = function ( rec ) {
Logger . prototype . _emit = function ( rec , noemit ) {
var i ;
var obj = objCopy ( rec [ 0 ] ) ;
@@ -685,6 +705,9 @@ Logger.prototype._emit = function (rec) {
str = JSON . stringify ( obj , safeCycles ( ) ) + '\n' ;
}
if ( noemit )
return str ;
for ( i = 0 ; i < this . streams . length ; i ++ ) {
var s = this . streams [ i ] ;
if ( s . level <= level ) {
@@ -693,6 +716,8 @@ Logger.prototype._emit = function (rec) {
s . stream . write ( s . raw ? obj : str ) ;
}
} ;
return str ;
}
@@ -702,33 +727,50 @@ Logger.prototype._emit = function (rec) {
*/
function mkLogEmitter ( minLevel ) {
return function ( ) {
var log = this ;
var mkRecord = function ( args ) {
if ( args [ 0 ] instanceof Error ) {
// `log.<level>(err, ...)`
fields = { err : errSerializer ( args [ 0 ] ) } ;
if ( args . length === 1 ) {
msgArgs = [ fields . err . message ] ;
} else {
msgArgs = Array . prototype . slice . call ( args , 1 ) ;
}
} else if ( typeof ( args [ 0 ] ) === 'string' ) { // `log.<level>(msg, ...)`
fields = null ;
msgArgs = Array . prototype . slice . call ( args ) ;
} else if ( Buffer . isBuffer ( args [ 0 ] ) ) { // `log.<level>(buf, ...)`
// Almost certainly an error, show `inspect(buf)`. See bunyan issue #35.
fields = null ;
msgArgs = Array . prototype . slice . call ( args ) ;
msgArgs [ 0 ] = util . inspect ( msgArgs [ 0 ] ) ;
} else { // `log.<level>(fields, msg, ...)`
fields = args [ 0 ] ;
msgArgs = Array . prototype . slice . call ( args , 1 ) ;
}
return log . _mkRecord ( fields , minLevel , msgArgs ) ;
} ;
var fields = null , msgArgs = null ;
if ( arguments . length === 0 ) { // `log.<level>()`
return ( this . _level <= minLevel ) ;
} else if ( this . _level > minLevel ) {
return ;
} else if ( arguments [ 0 ] instanceof Error ) {
// `log.<level>(err, ...)`
fields = { err : errSerializer ( arguments [ 0 ] ) } ;
if ( arguments . length === 1 ) {
msgArgs = [ fields . err . message ] ;
} else {
msgArgs = Array . prototype . slice . call ( arguments , 1 ) ;
}
} else if ( typeof ( arguments [ 0 ] ) === 'string' ) { // `log.<level>(msg, ...)`
fields = null ;
msgArgs = Array . prototype . slice . call ( arguments ) ;
} else if ( Buffer . isBuffer ( arguments [ 0 ] ) ) { // `log.<level>(buf, ...)`
// Almost certainly an error, show `inspect(buf)`. See bunyan issue #35.
fields = null ;
msgArgs = Array . prototype . slice . call ( arguments ) ;
msgArgs [ 0 ] = util . inspect ( msgArgs [ 0 ] ) ;
} else { // `log.<level>(fields, msg, ...)`
fields = arguments [ 0 ] ;
msgArgs = Array . prototype . slice . call ( arguments , 1 ) ;
/*
* Even if our level is such that we will not emit the record, we want
* to fire the DTrace probe associated with the level -- but we only
* assemble the string representation if the probe is in fact enabled.
*/
msgArgs = arguments ;
probes [ minLevel ] . fire ( function ( ) {
return [ log . _emit ( mkRecord ( msgArgs ) , true ) ] ;
} ) ;
} else {
var str = this . _emit ( mkRecord ( arguments ) ) ;
probes [ minLevel ] . fire ( function ( ) { return [ str ] ; } ) ;
}
var rec = this . _mkRecord ( fields , minLevel , msgArgs ) ;
this . _emit ( rec ) ;
}
}
