lwp::debugfile.3

来自「视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.」· 3 代码 · 共 274 行

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.\" ========================================================================
.\"
.IX Title "LWP::DebugFile 3"
.TH LWP::DebugFile 3 "2003-10-23" "perl v5.10.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
LWP::DebugFile \- routines for tracing/debugging LWP
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
If you want to see just what \s-1LWP\s0 is doing when your program calls it,
add this to the beginning of your program's source:
.PP
.Vb 1
\&  use LWP::DebugFile;
.Ve
.PP
For even more verbose debug output, do this instead:
.PP
.Vb 1
\&  use LWP::DebugFile (\*(Aq+\*(Aq);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module is like LWP::Debug in that it allows you to see what your
calls to \s-1LWP\s0 are doing behind the scenes.  But it is unlike
LWP::Debug in that it sends the output to a file, instead
of to \s-1STDERR\s0 (as LWP::Debug does).
.SH "OPTIONS"
.IX Header "OPTIONS"
The options you can use in \f(CW\*(C`use LWP::DebugFile (\f(CIoptions\f(CW)\*(C'\fR are the
same as the \fBnon-exporting\fR options available from \f(CW\*(C`use LWP::Debug
(\f(CIoptions\f(CW)\*(C'\fR.  That is, you can do things like this:
.PP
.Vb 3
\&  use LWP::DebugFile qw(+);
\&  use LWP::Debug qw(+ \-conns);
\&  use LWP::Debug qw(trace);
.Ve
.PP
The meanings of these are explained in the
documentation for LWP::Debug.
The only differences are that by default, LWP::DebugFile has \f(CW\*(C`cons\*(C'\fR
debugging on, ad that (as mentioned earlier), only \f(CW\*(C`non\-exporting\*(C'\fR
options are available.  That is, you \fBcan't\fR do this:
.PP
.Vb 1
\&  use LWP::DebugFile qw(trace); # wrong
.Ve
.PP
You might expect that to export LWP::Debug's \f(CW\*(C`trace()\*(C'\fR function,
but it doesn't work \*(-- it's a compile-time error.
.SH "OUTPUT FILE NAMING"
.IX Header "OUTPUT FILE NAMING"
If you don't do anything, the output file (where all the \s-1LWP\s0 debug/trace
output goes) will be in the current directory, and will be named like
\&\fIlwp_3db7aede_b93.log\fR, where \fI3db7aede\fR is \f(CW$^T\fR expressed in hex,
and \f(CW\*(C`b93\*(C'\fR is \f(CW$$\fR expressed in hex.  Presumably this is a
unique-for-all-time filename!
.PP
If you don't want the files to go in the current directory, you
can set \f(CW$LWP::DebugFile::outpath\fR before you load the LWP::DebugFile
module:
.PP
.Vb 2
\&  BEGIN { $LWP::DebugFile::outpath = \*(Aq/tmp/crunk/\*(Aq }
\&  use LWP::DebugFile;
.Ve
.PP
Note that you must end the value with a path separator (\*(L"/\*(R" in this
case \*(-- under MacPerl it would be \*(L":\*(R").  With that set, you will
have output files named like \fI/tmp/crunk/lwp_3db7aede_b93.log\fR.
.PP
If you want the LWP::DebugFile output to go a specific filespec (instead
of just a uniquely named file, in whatever directory), instead set the
variable \f(CW$LWP::DebugFile::outname\fR, like so:
.PP
.Vb 2
\&  BEGIN { $LWP::DebugFile::outname = \*(Aq/home/mojojojo/lwp.log\*(Aq }
\&  use LWP::DebugFile;
.Ve
.PP
In that case, \f(CW$LWP::DebugFile::outpath\fR isn't consulted at all, and
output is always written to the file \fI/home/mojojojo/lwp.log\fR.
.PP
Note that the value of \f(CW$LWP::DebugFile::outname\fR doesn't need to
be an absolute filespec.  You can do this:
.PP
.Vb 2
\&  BEGIN { $LWP::DebugFile::outname = \*(Aqlwp.log\*(Aq }
\&  use LWP::DebugFile;
.Ve
.PP
In that case, output goes to a file named \fIlwp.log\fR in the current
directory \*(-- specifically, whatever directory is current when
LWP::DebugFile is first loaded. \f(CW$LWP::DebugFile::outpath\fR is still not
consulted \*(-- its value is used only if \f(CW$LWP::DebugFile::outname\fR
isn't set.
.SH "ENVIRONMENT"
.IX Header "ENVIRONMENT"
If you set the environment variables \f(CW\*(C`LWPDEBUGPATH\*(C'\fR or 
\&\f(CW\*(C`LWPDEBUGFILE\*(C'\fR, their values will be used in initializing the
values of \f(CW$LWP::DebugFile::outpath\fR
and \f(CW$LWP::DebugFile::outname\fR.
.PP
That is, if you have \f(CW\*(C`LWPDEBUGFILE\*(C'\fR set to \fI/home/mojojojo/lwp.log\fR,
then you can just start out your program with:
.PP
.Vb 1
\&  use LWP::DebugFile;
.Ve
.PP
and it will act as if you had started it like this:
.PP
.Vb 2
\&  BEGIN { $LWP::DebugFile::outname = \*(Aq/home/mojojojo/lwp.log\*(Aq }
\&  use LWP::DebugFile;
.Ve
.SH "IMPLEMENTATION NOTES"
.IX Header "IMPLEMENTATION NOTES"
This module works by subclassing \f(CW\*(C`LWP::Debug\*(C'\fR, (notably inheriting its
\&\f(CW\*(C`import\*(C'\fR). It also redefines \f(CW&LWP::Debug::conns\fR and
\&\f(CW&LWP::Debug::_log\fR to make for output that is a little more verbose,
and friendlier for when you're looking at it later in a log file.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
LWP::Debug
.SH "COPYRIGHT AND DISCLAIMERS"
.IX Header "COPYRIGHT AND DISCLAIMERS"
Copyright (c) 2002 Sean M. Burke.
.PP
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
.PP
This program is distributed in the hope that it will be useful, but
without any warranty; without even the implied warranty of
merchantability or fitness for a particular purpose.
.SH "AUTHOR"
.IX Header "AUTHOR"
Sean M. Burke \f(CW\*(C`[e-mail]\*(C'\fR