'\"
'\" Generated from file 'logger\&.man' by tcllib/doctools with format 'nroff'
'\"
.TH "logger" n 0\&.9\&.5 tcllib "Object Oriented logging facility"
.\" The -*- nroff -*- definitions below are for supplemental macros used
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.BS
.SH NAME
logger \- System to control logging of events\&.
.SH SYNOPSIS
package require \fBTcl 8\&.5 9\fR
.sp
package require \fBlogger ?0\&.9\&.5?\fR
.sp
\fBlogger::init\fR \fIservice\fR
.sp
\fBlogger::import\fR ?\fB-all\fR? ?\fB-force\fR? ?\fB-prefix\fR \fIprefix\fR? ?\fB-namespace\fR \fInamespace\fR? \fIservice\fR
.sp
\fBlogger::initNamespace\fR \fIns\fR ?\fIlevel\fR?
.sp
\fBlogger::services\fR
.sp
\fBlogger::enable\fR \fIlevel\fR
.sp
\fBlogger::disable\fR \fIlevel\fR
.sp
\fBlogger::setlevel\fR \fIlevel\fR
.sp
\fBlogger::levels\fR
.sp
\fBlogger::servicecmd\fR \fIservice\fR
.sp
\fB${log}::debug\fR \fImessage\fR
.sp
\fB${log}::info\fR \fImessage\fR
.sp
\fB${log}::notice\fR \fImessage\fR
.sp
\fB${log}::warn\fR \fImessage\fR
.sp
\fB${log}::error\fR \fImessage\fR
.sp
\fB${log}::critical\fR \fImessage\fR
.sp
\fB${log}::alert\fR \fImessage\fR
.sp
\fB${log}::emergency\fR \fImessage\fR
.sp
\fB${log}::setlevel\fR \fIlevel\fR
.sp
\fB${log}::enable\fR \fIlevel\fR
.sp
\fB${log}::disable\fR \fIlevel\fR
.sp
\fB${log}::lvlchangeproc\fR \fIcommand\fR
.sp
\fB${log}::lvlchangeproc\fR
.sp
\fB${log}::logproc\fR \fIlevel\fR
.sp
\fB${log}::logproc\fR \fIlevel\fR \fIcommand\fR
.sp
\fB${log}::logproc\fR \fIlevel\fR \fIargname\fR \fIbody\fR
.sp
\fB${log}::services\fR
.sp
\fB${log}::servicename\fR
.sp
\fB${log}::currentloglevel\fR
.sp
\fB${log}::delproc\fR \fIcommand\fR
.sp
\fB${log}::delproc\fR
.sp
\fB${log}::delete\fR
.sp
\fB${log}::trace\fR \fIcommand\fR
.sp
\fB${log}::trace\fR \fBon\fR
.sp
\fB${log}::trace\fR \fBoff\fR
.sp
\fB${log}::trace\fR \fBstatus\fR ?procName? ?\&.\&.\&.?
.sp
\fB${log}::trace\fR \fBadd\fR \fIprocName\fR ?\&.\&.\&.?
.sp
\fB${log}::trace\fR \fBadd\fR ?-ns? \fInsName\fR ?\&.\&.\&.?
.sp
\fB${log}::trace\fR \fBremove\fR \fIprocName\fR ?\&.\&.\&.?
.sp
\fB${log}::trace\fR \fBremove\fR ?-ns? \fInsName\fR ?\&.\&.\&.?
.sp
.BE
.SH DESCRIPTION
.PP
The \fBlogger\fR package provides a flexible system for logging messages
from different services, at priority levels, with different commands\&.
.PP
To begin using the logger package, we do the following:
.PP
.CS


    package require logger
    set log [logger::init myservice]
    ${log}::notice "Initialized myservice logging"

    \&.\&.\&. code \&.\&.\&.

    ${log}::notice "Ending myservice logging"
    ${log}::delete

.CE
.PP
In the above code, after the package is loaded, the following things
happen:
.TP
\fBlogger::init\fR \fIservice\fR
Initializes the service \fIservice\fR for logging\&.  The service names
are actually Tcl namespace names, so they are separated with '::'\&.
The service name may not be the empty string or only ':'s\&.
When a logger service is initialized, it "inherits" properties from its
parents\&.  For instance, if there were a service \fIfoo\fR, and
we did a \fBlogger::init\fR \fIfoo::bar\fR (to create a \fIbar\fR
service underneath \fIfoo\fR), \fIbar\fR would copy the current
configuration of the \fIfoo\fR service, although it would of
course, also be possible to then separately configure \fIbar\fR\&.
If a logger service is initialized and the parent does not yet exist, the
parent is also created\&.
The new logger service is initialized with the default loglevel set
with \fBlogger::setlevel\fR\&.
.TP
\fBlogger::import\fR ?\fB-all\fR? ?\fB-force\fR? ?\fB-prefix\fR \fIprefix\fR? ?\fB-namespace\fR \fInamespace\fR? \fIservice\fR
Import the logger service commands into the current namespace\&. Without the \fB-all\fR option
only the commands corresponding to the log levels are imported\&. If \fB-all\fR is given,
all the \fB${log}::cmd\fR style commands are imported\&. If the import would overwrite a command
an error is returned and no command is imported\&. Use the \fB-force\fR option to force the import
and overwrite existing commands without complaining\&.
If the \fB-prefix\fR option is given, the commands are imported with the given \fIprefix\fR
prepended to their names\&.
If the \fB-namespace\fR option is given, the commands are imported into the given namespace\&. If the
namespace does not exist, it is created\&. If a namespace without a leading :: is given, it is interpreted as
a child namespace to the current namespace\&.
.TP
\fBlogger::initNamespace\fR \fIns\fR ?\fIlevel\fR?
Convenience command for setting up a namespace for logging\&. Creates a
logger service named after the namespace \fIns\fR (a :: prefix is
stripped), imports all the log commands into the namespace, and sets
the default logging level, either as specified by \fIlevel\fR, or
inherited from a service in the parent namespace, or a hardwired
default, \fBwarn\fR\&.
.TP
\fBlogger::services\fR
Returns a list of all the available services\&.
.TP
\fBlogger::enable\fR \fIlevel\fR
Globally enables logging at and "above" the given level\&.  Levels are
\fBdebug\fR, \fBinfo\fR, \fBnotice\fR, \fBwarn\fR, \fBerror\fR,
\fBcritical\fR, \fBalert\fR, \fBemergency\fR\&.
.TP
\fBlogger::disable\fR \fIlevel\fR
Globally disables logging at and "below" the given level\&.  Levels are
those listed above\&.
.TP
\fBlogger::setlevel\fR \fIlevel\fR
Globally enable logging at and "above" the given level\&. Levels are those
listed above\&. This command changes the default loglevel for new loggers
created with \fBlogger::init\fR\&.
.TP
\fBlogger::levels\fR
Returns a list of the available log levels (also listed above under \fBenable\fR)\&.
.TP
\fBlogger::servicecmd\fR \fIservice\fR
Returns the \fB${log}\fR token created by \fBlogger::init\fR for this service\&.
.TP
\fB${log}::debug\fR \fImessage\fR
.TP
\fB${log}::info\fR \fImessage\fR
.TP
\fB${log}::notice\fR \fImessage\fR
.TP
\fB${log}::warn\fR \fImessage\fR
.TP
\fB${log}::error\fR \fImessage\fR
.TP
\fB${log}::critical\fR \fImessage\fR
.TP
\fB${log}::alert\fR \fImessage\fR
.TP
\fB${log}::emergency\fR \fImessage\fR
These are the commands called to actually log a message about an
event\&.  \fB${log}\fR is the variable obtained from \fBlogger::init\fR\&.
.TP
\fB${log}::setlevel\fR \fIlevel\fR
Enable logging, in the service referenced by \fB${log}\fR, and its
children, at and above the level specified, and disable logging below
it\&.
.TP
\fB${log}::enable\fR \fIlevel\fR
Enable logging, in the service referenced by \fB${log}\fR, and its
children, at and above the level specified\&.  Note that this does \fInot\fR disable logging below this level, so you should probably use
\fBsetlevel\fR instead\&.
.TP
\fB${log}::disable\fR \fIlevel\fR
Disable logging, in the service referenced by \fB${log}\fR, and its
children, at and below the level specified\&. Note that this does \fInot\fR enable logging above this level,
so you should probably use \fBsetlevel\fR instead\&.
Disabling the loglevel \fBemergency\fR switches logging off for the service and its children\&.
.TP
\fB${log}::lvlchangeproc\fR \fIcommand\fR
.TP
\fB${log}::lvlchangeproc\fR
Set the script to call when the log instance in question changes its log level\&.
If called without a command it returns the currently registered command\&. The command gets two arguments
appended, the old and the new loglevel\&. The callback is invoked after all changes have been done\&.
If child loggers are affected, their callbacks are called before their parents callback\&.
.CS


 	proc lvlcallback {old new} {
 	    puts "Loglevel changed from $old to $new"
 	}
 	${log}::lvlchangeproc lvlcallback

.CE
.TP
\fB${log}::logproc\fR \fIlevel\fR
.TP
\fB${log}::logproc\fR \fIlevel\fR \fIcommand\fR
.TP
\fB${log}::logproc\fR \fIlevel\fR \fIargname\fR \fIbody\fR
This command comes in three forms - the third, older one is deprecated
and may be removed from future versions of the logger package\&.
The current set version takes one argument, a command to be executed when the
level is called\&.  The callback command takes on argument, the text to
be logged\&. If called only with a valid level \fBlogproc\fR returns the name of the command
currently registered as callback command\&.
\fBlogproc\fR specifies which command will perform the actual logging
for a given level\&.  The logger package ships with default commands for
all log levels, but with \fBlogproc\fR it is possible to replace them
with custom code\&.  This would let you send your logs over the network,
to a database, or anything else\&.  For example:
.CS


    proc logtoserver {txt} {
        variable socket
        puts $socket "Notice: $txt"
    }

    ${log}::logproc notice logtoserver

.CE
.IP
Trace logs are slightly different: instead of a plain text argument,
the argument provided to the logproc is a dictionary consisting of the
\fBenter\fR or \fBleave\fR keyword along with another dictionary of
details about the trace\&.  These include:
.RS
.IP \(bu
\fBproc\fR - Name of the procedure being traced\&.
.IP \(bu
\fBlevel\fR - The stack level for the procedure invocation
(from \fBinfo\fR \fBlevel\fR)\&.
.IP \(bu
\fBscript\fR - The name of the file in which the procedure is
defined, or an empty string if defined in interactive mode\&.
.IP \(bu
\fBcaller\fR - The name of the procedure calling the procedure
being traced, or an empty string if the procedure was called from the
global scope (stack level 0)\&.
.IP \(bu
\fBprocargs\fR - A dictionary consisting of the names of arguments
to the procedure paired with values given for those arguments (\fBenter\fR
traces only)\&.
.IP \(bu
\fBstatus\fR - The Tcl return code (e\&.g\&. \fBok\fR,
\fBcontinue\fR, etc\&.) (\fBleave\fR traces only)\&.
.IP \(bu
\fBresult\fR - The value returned by the procedure (\fBleave\fR
traces only)\&.
.RE
.TP
\fB${log}::services\fR
Returns a list of the registered logging services which are children of this service\&.
.TP
\fB${log}::servicename\fR
Returns the name of this service\&.
.TP
\fB${log}::currentloglevel\fR
Returns the currently enabled log level for this service\&. If no logging is enabled returns \fBnone\fR\&.
.TP
\fB${log}::delproc\fR \fIcommand\fR
.TP
\fB${log}::delproc\fR
Set the script to call when the log instance in question is deleted\&.
If called without a command it returns the currently registered command\&.
For example:
.CS


    ${log}::delproc [list closesock $logsock]

.CE
.TP
\fB${log}::delete\fR
This command deletes a particular logging service, and its children\&.
You must call this to clean up the resources used by a service\&.
.TP
\fB${log}::trace\fR \fIcommand\fR
This command controls logging of enter/leave traces for specified procedures\&.
It is used to enable and disable tracing, query tracing status, and
specify procedures are to be traced\&.  Trace handlers are unregistered when
tracing is disabled\&.  As a result, there is not performance impact to a
library when tracing is disabled, just as with other log level commands\&.
.CS


  proc tracecmd { dict } {
      puts $dict
  }

  set log [::logger::init example]
  ${log}::logproc trace tracecmd

  proc foo { args } {
      puts "In foo"
      bar 1
      return "foo_result"
  }

  proc bar { x } {
      puts "In bar"
      return "bar_result"
  }

  ${log}::trace add foo bar
  ${log}::trace on

  foo

# Output:
enter {proc ::foo level 1 script {} caller {} procargs {args {}}}
In foo
enter {proc ::bar level 2 script {} caller ::foo procargs {x 1}}
In bar
leave {proc ::bar level 2 script {} caller ::foo status ok result bar_result}
leave {proc ::foo level 1 script {} caller {} status ok result foo_result}

.CE
.TP
\fB${log}::trace\fR \fBon\fR
Turns on trace logging for procedures registered through the \fBtrace\fR
\fBadd\fR command\&.  This is similar to the \fBenable\fR command for other
logging levels, but allows trace logging to take place at any level\&.
The trace logging mechanism takes advantage of the execution trace feature
of Tcl 8\&.4 and later\&.  The \fBtrace\fR \fBon\fR command will return an
error if called from earlier versions of Tcl\&.
.TP
\fB${log}::trace\fR \fBoff\fR
Turns off trace logging for procedures registered for trace logging
through the \fBtrace\fR \fBadd\fR command\&.  This is similar to the
\fBdisable\fR command for other logging levels, but allows trace logging
to take place at any level\&.
Procedures are not unregistered, so logging for them can be turned back
on with the \fBtrace\fR \fBon\fR command\&.  There is no overhead imposed
by trace registration when trace logging is disabled\&.
.TP
\fB${log}::trace\fR \fBstatus\fR ?procName? ?\&.\&.\&.?
This command returns a list of the procedures currently registered for
trace logging, or a flag indicating whether or not a trace is registered
for one or more specified procedures\&.
.TP
\fB${log}::trace\fR \fBadd\fR \fIprocName\fR ?\&.\&.\&.?
.TP
\fB${log}::trace\fR \fBadd\fR ?-ns? \fInsName\fR ?\&.\&.\&.?
This command registers one or more procedures for logging of entry/exit
traces\&.  Procedures can be specified via a list of procedure names or
namespace names (in which case all procedure within the namespace
are targeted by the operation)\&.  By default, each name is first
interpreted as a procedure name or glob-style search pattern, and if
not found its interpreted as a namespace name\&.  The \fI-ns\fR option can
be used to force interpretation of all provided arguments as namespace names\&.
Procedures must be defined prior to registering them for tracing
through the \fBtrace\fR \fBadd\fR command\&.  Any procedure or namespace
names/patterns that don't match any existing procedures will be
silently ignored\&.
.TP
\fB${log}::trace\fR \fBremove\fR \fIprocName\fR ?\&.\&.\&.?
.TP
\fB${log}::trace\fR \fBremove\fR ?-ns? \fInsName\fR ?\&.\&.\&.?
This command unregisters one or more procedures so that they will no
longer have trace logging performed, with the same matching rules as
that of the \fBtrace\fR \fBadd\fR command\&.
.PP
.SH IMPLEMENTATION
The logger package is implemented in such a way as to optimize (for
Tcl 8\&.4 and newer) log procedures which are disabled\&.  They are
aliased to a proc which has no body, which is compiled to a no op in
bytecode\&.  This should make the peformance hit minimal\&.  If you really
want to pull out all the stops, you can replace the ${log} token in
your code with the actual namespace and command (${log}::warn becomes
::logger::tree::myservice::warn), so that no variable lookup is done\&.
This puts the performance of disabled logger commands very close to no
logging at all\&.
.PP
The "object orientation" is done through a hierarchy of namespaces\&.
Using an actual object oriented system would probably be a better way
of doing things, or at least provide for a cleaner implementation\&.
.PP
The service "object orientation" is done with namespaces\&.
.SH "LOGPROCS AND CALLSTACK"
The logger package takes extra care to keep the logproc out of the call stack\&.
This enables logprocs to execute code in the callers scope by using uplevel or
linking to local variables by using upvar\&. This may fire traces with all usual
side effects\&.
.CS


     # Print caller and current vars in the calling proc
     proc log_local_var {txt} {
          set caller [info level -1]
          set vars [uplevel 1 info vars]
          foreach var [lsort $vars] {
             if {[uplevel 1 [list array exists $var]] == 1} {
             	lappend val $var <Array>
             } else {
             	lappend val $var [uplevel 1 [list set $var]]
             }
          }
          puts "$txt"
          puts "Caller: $caller"
          puts "Variables in callers scope:"
          foreach {var value} $val {
          	puts "$var = $value"
          }
     }

     # install as logproc
     ${log}::logproc debug log_local_var

.CE
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fIlogger\fR of the
\fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.PP
When proposing code changes, please provide \fIunified diffs\fR,
i\&.e the output of \fBdiff -u\fR\&.
.PP
Note further that \fIattachments\fR are strongly preferred over
inlined patches\&. Attachments can be made by going to the \fBEdit\fR
form of the ticket immediately after its creation, and then using the
left-most button in the secondary navigation bar\&.
.SH KEYWORDS
log, log level, logger, service
.SH CATEGORY
Programming tools
