548 lines
17 KiB
Ruby
548 lines
17 KiB
Ruby
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# The Breakpoint library provides the convenience of
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# being able to inspect and modify state, diagnose
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# bugs all via IRB by simply setting breakpoints in
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# your applications by the call of a method.
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#
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# This library was written and is supported by me,
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# Florian Gross. I can be reached at flgr@ccan.de
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# and enjoy getting feedback about my libraries.
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#
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# The whole library (including breakpoint_client.rb
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# and binding_of_caller.rb) is licensed under the
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# same license that Ruby uses. (Which is currently
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# either the GNU General Public License or a custom
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# one that allows for commercial usage.) If you for
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# some good reason need to use this under another
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# license please contact me.
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require 'irb'
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require 'caller'
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require 'drb'
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require 'drb/acl'
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require 'thread'
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module Breakpoint
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id = %q$Id: breakpoint.rb 52 2005-02-26 19:43:19Z flgr $
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current_version = id.split(" ")[2]
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unless defined?(Version)
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# The Version of ruby-breakpoint you are using as String of the
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# 1.2.3 form where the digits stand for release, major and minor
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# version respectively.
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Version = "0.5.0"
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end
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extend self
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# This will pop up an interactive ruby session at a
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# pre-defined break point in a Ruby application. In
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# this session you can examine the environment of
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# the break point.
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#
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# You can get a list of variables in the context using
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# local_variables via +local_variables+. You can then
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# examine their values by typing their names.
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#
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# You can have a look at the call stack via +caller+.
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#
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# The source code around the location where the breakpoint
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# was executed can be examined via +source_lines+. Its
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# argument specifies how much lines of context to display.
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# The default amount of context is 5 lines. Note that
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# the call to +source_lines+ can raise an exception when
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# it isn't able to read in the source code.
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#
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# breakpoints can also return a value. They will execute
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# a supplied block for getting a default return value.
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# A custom value can be returned from the session by doing
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# +throw(:debug_return, value)+.
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#
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# You can also give names to break points which will be
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# used in the message that is displayed upon execution
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# of them.
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#
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# Here's a sample of how breakpoints should be placed:
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#
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# class Person
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# def initialize(name, age)
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# @name, @age = name, age
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# breakpoint("Person#initialize")
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# end
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#
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# attr_reader :age
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# def name
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# breakpoint("Person#name") { @name }
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# end
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# end
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#
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# person = Person.new("Random Person", 23)
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# puts "Name: #{person.name}"
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#
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# And here is a sample debug session:
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#
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# Executing break point "Person#initialize" at file.rb:4 in `initialize'
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# irb(#<Person:0x292fbe8>):001:0> local_variables
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# => ["name", "age", "_", "__"]
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# irb(#<Person:0x292fbe8>):002:0> [name, age]
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# => ["Random Person", 23]
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# irb(#<Person:0x292fbe8>):003:0> [@name, @age]
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# => ["Random Person", 23]
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# irb(#<Person:0x292fbe8>):004:0> self
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# => #<Person:0x292fbe8 @age=23, @name="Random Person">
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# irb(#<Person:0x292fbe8>):005:0> @age += 1; self
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# => #<Person:0x292fbe8 @age=24, @name="Random Person">
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# irb(#<Person:0x292fbe8>):006:0> exit
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# Executing break point "Person#name" at file.rb:9 in `name'
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# irb(#<Person:0x292fbe8>):001:0> throw(:debug_return, "Overriden name")
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# Name: Overriden name
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#
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# Breakpoint sessions will automatically have a few
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# convenience methods available. See Breakpoint::CommandBundle
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# for a list of them.
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#
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# Breakpoints can also be used remotely over sockets.
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# This is implemented by running part of the IRB session
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# in the application and part of it in a special client.
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# You have to call Breakpoint.activate_drb to enable
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# support for remote breakpoints and then run
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# breakpoint_client.rb which is distributed with this
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# library. See the documentation of Breakpoint.activate_drb
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# for details.
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def breakpoint(id = nil, context = nil, &block)
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callstack = caller
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callstack.slice!(0, 3) if callstack.first["breakpoint"]
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file, line, method = *callstack.first.match(/^(.+?):(\d+)(?::in `(.*?)')?/).captures
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message = "Executing break point " + (id ? "#{id.inspect} " : "") +
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"at #{file}:#{line}" + (method ? " in `#{method}'" : "")
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if context then
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return handle_breakpoint(context, message, file, line, &block)
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end
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Binding.of_caller do |binding_context|
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handle_breakpoint(binding_context, message, file, line, &block)
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end
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end
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# These commands are automatically available in all breakpoint shells.
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module CommandBundle
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# Proxy to a Breakpoint client. Lets you directly execute code
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# in the context of the client.
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class Client
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def initialize(eval_handler) # :nodoc:
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eval_handler.untaint
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@eval_handler = eval_handler
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end
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instance_methods.each do |method|
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next if method[/^__.+__$/]
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undef_method method
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end
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# Executes the specified code at the client.
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def eval(code)
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@eval_handler.call(code)
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end
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# Will execute the specified statement at the client.
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def method_missing(method, *args, &block)
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if args.empty? and not block
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result = eval "#{method}"
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else
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# This is a bit ugly. The alternative would be using an
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# eval context instead of an eval handler for executing
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# the code at the client. The problem with that approach
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# is that we would have to handle special expressions
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# like "self", "nil" or constants ourself which is hard.
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remote = eval %{
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result = lambda { |block, *args| #{method}(*args, &block) }
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def result.call_with_block(*args, &block)
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call(block, *args)
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end
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result
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}
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remote.call_with_block(*args, &block)
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end
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return result
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end
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end
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# Returns the source code surrounding the location where the
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# breakpoint was issued.
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def source_lines(context = 5, return_line_numbers = false)
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lines = File.readlines(@__bp_file).map { |line| line.chomp }
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break_line = @__bp_line
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start_line = [break_line - context, 1].max
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end_line = break_line + context
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result = lines[(start_line - 1) .. (end_line - 1)]
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if return_line_numbers then
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return [start_line, break_line, result]
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else
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return result
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end
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end
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# Lets an object that will forward method calls to the breakpoint
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# client. This is useful for outputting longer things at the client
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# and so on. You can for example do these things:
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#
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# client.puts "Hello" # outputs "Hello" at client console
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# # outputs "Hello" into the file temp.txt at the client
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# client.File.open("temp.txt", "w") { |f| f.puts "Hello" }
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def client()
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if Breakpoint.use_drb? then
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sleep(0.5) until Breakpoint.drb_service.eval_handler
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Client.new(Breakpoint.drb_service.eval_handler)
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else
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Client.new(lambda { |code| eval(code, TOPLEVEL_BINDING) })
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end
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end
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end
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def handle_breakpoint(context, message, file = "", line = "", &block) # :nodoc:
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catch(:debug_return) do |value|
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eval(%{
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@__bp_file = #{file.inspect}
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@__bp_line = #{line}
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extend Breakpoint::CommandBundle
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extend DRbUndumped if self
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}, context) rescue nil
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if not use_drb? then
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puts message
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IRB.start(nil, IRB::WorkSpace.new(context))
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else
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@drb_service.add_breakpoint(context, message)
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end
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block.call if block
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end
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end
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# These exceptions will be raised on failed asserts
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# if Breakpoint.asserts_cause_exceptions is set to
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# true.
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class FailedAssertError < RuntimeError
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end
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# This asserts that the block evaluates to true.
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# If it doesn't evaluate to true a breakpoint will
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# automatically be created at that execution point.
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#
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# You can disable assert checking in production
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# code by setting Breakpoint.optimize_asserts to
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# true. (It will still be enabled when Ruby is run
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# via the -d argument.)
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#
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# Example:
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# person_name = "Foobar"
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# assert { not person_name.nil? }
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#
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# Note: If you want to use this method from an
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# unit test, you will have to call it by its full
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# name, Breakpoint.assert.
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def assert(context = nil, &condition)
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return if Breakpoint.optimize_asserts and not $DEBUG
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return if yield
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callstack = caller
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callstack.slice!(0, 3) if callstack.first["assert"]
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file, line, method = *callstack.first.match(/^(.+?):(\d+)(?::in `(.*?)')?/).captures
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message = "Assert failed at #{file}:#{line}#{" in `#{method}'" if method}."
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if Breakpoint.asserts_cause_exceptions and not $DEBUG then
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raise(Breakpoint::FailedAssertError, message)
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end
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message += " Executing implicit breakpoint."
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if context then
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return handle_breakpoint(context, message, file, line)
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end
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Binding.of_caller do |context|
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handle_breakpoint(context, message, file, line)
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end
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end
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# Whether asserts should be ignored if not in debug mode.
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# Debug mode can be enabled by running ruby with the -d
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# switch or by setting $DEBUG to true.
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attr_accessor :optimize_asserts
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self.optimize_asserts = false
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# Whether an Exception should be raised on failed asserts
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# in non-$DEBUG code or not. By default this is disabled.
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attr_accessor :asserts_cause_exceptions
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self.asserts_cause_exceptions = false
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@use_drb = false
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attr_reader :drb_service # :nodoc:
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class DRbService # :nodoc:
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include DRbUndumped
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def initialize
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@handler = @eval_handler = @collision_handler = nil
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IRB.instance_eval { @CONF[:RC] = true }
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IRB.run_config
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end
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def collision
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sleep(0.5) until @collision_handler
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@collision_handler.untaint
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@collision_handler.call
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end
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def ping() end
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def add_breakpoint(context, message)
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workspace = IRB::WorkSpace.new(context)
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workspace.extend(DRbUndumped)
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sleep(0.5) until @handler
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@handler.untaint
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@handler.call(workspace, message)
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rescue Errno::ECONNREFUSED, DRb::DRbConnError
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raise if Breakpoint.use_drb?
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end
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attr_accessor :handler, :eval_handler, :collision_handler
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end
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# Will run Breakpoint in DRb mode. This will spawn a server
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# that can be attached to via the breakpoint-client command
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# whenever a breakpoint is executed. This is useful when you
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# are debugging CGI applications or other applications where
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# you can't access debug sessions via the standard input and
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# output of your application.
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#
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# You can specify an URI where the DRb server will run at.
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# This way you can specify the port the server runs on. The
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# default URI is druby://localhost:42531.
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#
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# Please note that breakpoints will be skipped silently in
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# case the DRb server can not spawned. (This can happen if
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# the port is already used by another instance of your
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# application on CGI or another application.)
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#
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# Also note that by default this will only allow access
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# from localhost. You can however specify a list of
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# allowed hosts or nil (to allow access from everywhere).
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# But that will still not protect you from somebody
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# reading the data as it goes through the net.
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#
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# A good approach for getting security and remote access
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# is setting up an SSH tunnel between the DRb service
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# and the client. This is usually done like this:
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#
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# $ ssh -L20000:127.0.0.1:20000 -R10000:127.0.0.1:10000 example.com
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# (This will connect port 20000 at the client side to port
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# 20000 at the server side, and port 10000 at the server
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# side to port 10000 at the client side.)
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#
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# After that do this on the server side: (the code being debugged)
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# Breakpoint.activate_drb("druby://127.0.0.1:20000", "localhost")
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#
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# And at the client side:
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# ruby breakpoint_client.rb -c druby://127.0.0.1:10000 -s druby://127.0.0.1:20000
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#
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# Running through such a SSH proxy will also let you use
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# breakpoint.rb in case you are behind a firewall.
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#
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# Detailed information about running DRb through firewalls is
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# available at http://www.rubygarden.org/ruby?DrbTutorial
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#
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# == Security considerations
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# Usually you will be fine when using the default druby:// URI and the default
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# access control list. However, if you are sitting on a machine where there are
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# local users that you likely can not trust (this is the case for example on
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||
|
|
# most web hosts which have multiple users sitting on the same physical machine)
|
||
|
|
# you will be better off by doing client/server communication through a unix
|
||
|
|
# socket. This can be accomplished by calling with a drbunix:/ style URI, e.g.
|
||
|
|
# <code>Breakpoint.activate_drb('drbunix:/tmp/breakpoint_server')</code>. This
|
||
|
|
# will only work on Unix based platforms.
|
||
|
|
def activate_drb(uri = nil, allowed_hosts = ['localhost', '127.0.0.1', '::1'],
|
||
|
|
ignore_collisions = false)
|
||
|
|
|
||
|
|
return false if @use_drb
|
||
|
|
|
||
|
|
uri ||= 'druby://localhost:42531'
|
||
|
|
|
||
|
|
if allowed_hosts then
|
||
|
|
acl = ["deny", "all"]
|
||
|
|
|
||
|
|
Array(allowed_hosts).each do |host|
|
||
|
|
acl += ["allow", host]
|
||
|
|
end
|
||
|
|
|
||
|
|
DRb.install_acl(ACL.new(acl))
|
||
|
|
end
|
||
|
|
|
||
|
|
@use_drb = true
|
||
|
|
@drb_service = DRbService.new
|
||
|
|
did_collision = false
|
||
|
|
begin
|
||
|
|
@service = DRb.start_service(uri, @drb_service)
|
||
|
|
rescue Errno::EADDRINUSE
|
||
|
|
if ignore_collisions then
|
||
|
|
nil
|
||
|
|
else
|
||
|
|
# The port is already occupied by another
|
||
|
|
# Breakpoint service. We will try to tell
|
||
|
|
# the old service that we want its port.
|
||
|
|
# It will then forward that request to the
|
||
|
|
# user and retry.
|
||
|
|
unless did_collision then
|
||
|
|
DRbObject.new(nil, uri).collision
|
||
|
|
did_collision = true
|
||
|
|
end
|
||
|
|
sleep(10)
|
||
|
|
retry
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
return true
|
||
|
|
end
|
||
|
|
|
||
|
|
# Deactivates a running Breakpoint service.
|
||
|
|
def deactivate_drb
|
||
|
|
Thread.exclusive do
|
||
|
|
@service.stop_service unless @service.nil?
|
||
|
|
@service = nil
|
||
|
|
@use_drb = false
|
||
|
|
@drb_service = nil
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
# Returns true when Breakpoints are used over DRb.
|
||
|
|
# Breakpoint.activate_drb causes this to be true.
|
||
|
|
def use_drb?
|
||
|
|
@use_drb == true
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
module IRB # :nodoc:
|
||
|
|
class << self; remove_method :start; end
|
||
|
|
def self.start(ap_path = nil, main_context = nil, workspace = nil)
|
||
|
|
$0 = File::basename(ap_path, ".rb") if ap_path
|
||
|
|
|
||
|
|
# suppress some warnings about redefined constants
|
||
|
|
old_verbose, $VERBOSE = $VERBOSE, nil
|
||
|
|
IRB.setup(ap_path)
|
||
|
|
$VERBOSE = old_verbose
|
||
|
|
|
||
|
|
if @CONF[:SCRIPT] then
|
||
|
|
irb = Irb.new(main_context, @CONF[:SCRIPT])
|
||
|
|
else
|
||
|
|
irb = Irb.new(main_context)
|
||
|
|
end
|
||
|
|
|
||
|
|
if workspace then
|
||
|
|
irb.context.workspace = workspace
|
||
|
|
end
|
||
|
|
|
||
|
|
@CONF[:IRB_RC].call(irb.context) if @CONF[:IRB_RC]
|
||
|
|
@CONF[:MAIN_CONTEXT] = irb.context
|
||
|
|
|
||
|
|
old_sigint = trap("SIGINT") do
|
||
|
|
begin
|
||
|
|
irb.signal_handle
|
||
|
|
rescue RubyLex::TerminateLineInput
|
||
|
|
# ignored
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
catch(:IRB_EXIT) do
|
||
|
|
irb.eval_input
|
||
|
|
end
|
||
|
|
ensure
|
||
|
|
trap("SIGINT", old_sigint)
|
||
|
|
end
|
||
|
|
|
||
|
|
class << self
|
||
|
|
alias :old_CurrentContext :CurrentContext
|
||
|
|
remove_method :CurrentContext
|
||
|
|
remove_method :parse_opts
|
||
|
|
end
|
||
|
|
|
||
|
|
def IRB.CurrentContext
|
||
|
|
if old_CurrentContext.nil? and Breakpoint.use_drb? then
|
||
|
|
result = Object.new
|
||
|
|
def result.last_value; end
|
||
|
|
return result
|
||
|
|
else
|
||
|
|
old_CurrentContext
|
||
|
|
end
|
||
|
|
end
|
||
|
|
def IRB.parse_opts() end
|
||
|
|
|
||
|
|
class Context # :nodoc:
|
||
|
|
alias :old_evaluate :evaluate
|
||
|
|
def evaluate(line, line_no)
|
||
|
|
if line.chomp == "exit" then
|
||
|
|
exit
|
||
|
|
else
|
||
|
|
old_evaluate(line, line_no)
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
class WorkSpace # :nodoc:
|
||
|
|
alias :old_evaluate :evaluate
|
||
|
|
|
||
|
|
def evaluate(*args)
|
||
|
|
if Breakpoint.use_drb? then
|
||
|
|
result = old_evaluate(*args)
|
||
|
|
if args[0] != :no_proxy and
|
||
|
|
not [true, false, nil].include?(result)
|
||
|
|
then
|
||
|
|
result.extend(DRbUndumped) rescue nil
|
||
|
|
end
|
||
|
|
return result
|
||
|
|
else
|
||
|
|
old_evaluate(*args)
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
module InputCompletor # :nodoc:
|
||
|
|
def self.eval(code, context, *more)
|
||
|
|
# Big hack, this assumes that InputCompletor
|
||
|
|
# will only call eval() when it wants code
|
||
|
|
# to be executed in the IRB context.
|
||
|
|
IRB.conf[:MAIN_CONTEXT].workspace.evaluate(:no_proxy, code, *more)
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
module DRb # :nodoc:
|
||
|
|
class DRbObject # :nodoc:
|
||
|
|
undef :inspect if method_defined?(:inspect)
|
||
|
|
undef :clone if method_defined?(:clone)
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
# See Breakpoint.breakpoint
|
||
|
|
def breakpoint(id = nil, &block)
|
||
|
|
Binding.of_caller do |context|
|
||
|
|
Breakpoint.breakpoint(id, context, &block)
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
# See Breakpoint.assert
|
||
|
|
def assert(&block)
|
||
|
|
Binding.of_caller do |context|
|
||
|
|
Breakpoint.assert(context, &block)
|
||
|
|
end
|
||
|
|
end
|