NAME¶
Net::SIP::Debug - debugging of Net::SIP
SYNOPSIS¶
use Net::SIP::Debug 1;
use Net::SIP::Debug qw( Net::SIP*=0 Registrar=1 );
Net::SIP::Debug->level(1);
perl -MNet::SIP::Debug=1 app.pl
DESCRIPTION¶
Provides debugging support for Net::SIP. Debugging can be enabled/disabled
globally or per package and optional per subpackage.
It provides support for different debugging levels, e.g. the higher the level,
the more debugging is done. The following levels are used:
- Level 1
- Debug messages for users
- Level 2
- Includes short SIP packet dumps of incoming and outgoing data
- Level 5
- Includes detailed SIP packet dumps for incoming and outgoing data
- Level 10
- Includes information about call flow, e.g. why packets get dropped
etc.
- Level 50
- Detailed debugging for programmers using Net::SIP.
- Level 100
- Detailed debugging for core developers of Net::SIP.
CLASS METHODS¶
- import ( @ARGS )
- Extracts everything from arguments given to "use" which might be
usable by level and forwards rest to Exporter.
If the argument is a reference to a subroutine it will be used for showing
the debug message instead of printing it to STDERR. In this case the usual
prefixes incl the time will not be added (useful for forwarding debug to
syslog).
- level ( @ARGS )
- Enables/disables debugging depending on @ARGS. @ARGS might contain the
following specifications:
- NUMBER
- NUMBER will be interpreted as the debugging level. It's used in
debug etc to print only debug message which a level lower or equal
to NUMBER.
- PACKAGE
- Enables debugging for package PACKAGE. PACKAGE might be a fully qualified
package (e.g. "Net::SIP::Registrar") or the "Net" or
"Net::SIP" might be ommited ("Registrar"). If a
"*" is added the debugging will also be enabled for subpackages,
e.g. "Endpoint*" will enable debugging for Net::SIP::Endpoint
and Net::SIP::Endpoint::Context too.
- PACKAGE=NUMBER
- Similar to the previous item, but this sets debugging level to NUMBER for
the specified packages and thus can also be used to selectivly disable
debugging for some packages.
If @ARGS is empty it will return the debugging level for the package which
called this method (the first package in the caller stack which is not
Net::SIP::Debug itself).
- set_prefix ( PREFIX )
- Sets prefix used for debug messages to PREFIX. Default prefix is 'DEBUG:'
but for instance for forking applications it might be useful to change
this to "DEBUG($$):" or similar.
SUBROUTINES¶
- DEBUG|debug ( [ LEVEL ],( MESSAGE | FMT,@ARG ))
- If debugging is enabled it will print to STDERR debugging info. If
multiple arguments are given to the function they will be fed into
sprintf to create a single message.
If the first argument looks like a number (see looks_like_number in
Scalar::Util) it will be interpreted as the debug level for this message,
e.g. if it is higher than the user specified debug level the message will
not be printed.
The MESSAGE (or the result from "sprintf(FMT,@ARG)") will be
prefixed by the callers package, the callers function and the line from
which DEBUG was called. In front of the prefix the current time (as float
time_t) and the string "DEBUG:" will be added.
If the message consists of multiple lines each line will be prefixed by the
prefix and all but the first line will also have a TAB added between
prefix and message data.
The function is by default exported as DEBUG and can by exported as
debug too.
- DEBUG_DUMP ( [ LEVEL ], @DATA )
- Will call debug with the output from Data::Dumpers Dumper if
debugging is enabled. If @DATA has more than one item it will be fed as
reference into Dumper, otherwise only the single item will be fed
to Dumper. For the meaning of LEVEL see debug.
This function is exported by default.
- stacktrace ( MESSAGE | FMT,@ARG )
- Uses the arguments in debug, but instead of writing a debug message
to STDERR it will be used in Carp::longmess. Returns string with
stacktrace.
- LEAK_TRACK ( REF )
- This is used internally for tracking leaks. It will rebless REF into a new
class which behaves like the old one. Calls of LEAK_TRACK and DESTROY on
this class will be tracked and shown. If Devel::Peek can be loaded it will
Dump information about the REF on each call to LEAK_TRACK.
Exported by default.