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# $Id: trace.rb,v 1.1 2006/01/04 02:03:22 francis Exp $
#
# Tracing for DBI programs
#
# Copyright (c) 2001 Michael Neumann
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# 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. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
raise LoadError, "the trace module has been removed until it actually works."
# works only correct with the newest version > 0.3.3
require "aspectr"
require "dbi" # to work as "ruby -r dbi/trace myapp.rb"
module DBI
class HandleTracer < AspectR::Aspect
def initialize(klass)
@never_wrap = /^__|^send$|^id$|^class$|^$ /
self.wrap(klass, :pre, :post, methods(klass))
end
# trace methods --------------------------------------------------------------
def pre(method, object, exitstatus, *args)
par = args.collect{|a| a.inspect}.join(", ")
if object.trace_mode == 2 then
object.trace_output << "-> #{method} for #{object} (#{par})\n"
elsif object.trace_mode == 3 then
object.trace_output << "-> #{method} for #{object.inspect} (#{par})\n"
end
end
def post(method, object, exitstatus, *args)
case object.trace_mode
when 1, 2 # return values and errors
arrow = object.trace_mode == 1 ? "<=" : "<-"
if exitstatus.kind_of? Array
object.trace_output << "#{arrow} #{method} for #{object} = #{exitstatus[0] || 'nil'}\n"
else
if exitstatus == true
object.trace_output << "!! #{$!.message.chomp}\n"
end
object.trace_output << "#{arrow} #{method} for #{object}\n"
end
when 3
if exitstatus.kind_of? Array
object.trace_output << "<- #{method} for #{object.inspect} = #{exitstatus[0].inspect}\n"
else
if exitstatus == true
object.trace_output << "!! #{$!.inspect}\n"
end
object.trace_output << "<- #{method} for #{object.inspect}\n"
end
end
end
private # helper methods -----------------------------------------------------
def methods(klass)
meths = (DBI::Handle.instance_methods | klass.instance_methods) - %w(trace_mode trace_output trace)
/(#{meths.collect{|m| Regexp.quote(m)}.join('|')})/
end
end
@@tracer_driver = HandleTracer.new(DBI::DriverHandle)
@@tracer_database = HandleTracer.new(DBI::DatabaseHandle)
@@tracer_statement = HandleTracer.new(DBI::StatementHandle)
end # module DBI
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