ruby - 调试 Sinatra 应用程序

Question

我安装了 pry 并尝试使用它。

gem "pry"    

require 'pry'
#..........
binding.pry

但是有3个问题：

• 我不知道去下一个字符串（而不是下一个断点）或观察变量的值。没有关于它的信息！
• 有很多不同的撬！pry-debug、pry、pry-db 等等。我应该使用哪一个？
• 它应该停在那里。但我还不知道（也没有找到）如何查看变量的值或如何转到下一行。它总是在几秒钟内给出以下错误：

pry(#)> 错误：执行已过期
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:600:in `getbyte'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:600:in `readline'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:600:in `block in readline'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:544:in `handle_read_errors'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:589:in `readline'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:369:in `retrieve_line'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:304:in `block in r'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:301:in `loop'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:301:in `r'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:271:in `re'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:251:in `rep'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:231:in `repl 中的块（3 级）'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:230:in `loop'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:230:in `repl 中的块（2 级）'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:229:in `catch'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:229:in `block in repl'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:228:in `catch'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:228:in `repl'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_class.rb:154:in `start'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/core_extensions.rb:22:in `pry'
/home/alex/Documents/ruby/my_projects/controllers/my_controller.rb:24:in `block in '
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:1265:in `call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:1265:in `block in compile!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `[]'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `block (3 levels) in route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:851:in `route_eval'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `block (2 levels) in route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:872:in `block in process_route'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:870:in `catch'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:870:in `process_route'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:834:in `block in route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:833:in `每个'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:833:in `route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:936:in `dispatch!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:769:in `block in call!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `block in invoke'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `catch'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `invoke'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:769:in `call!'
/home/alex/Documents/ruby/my_projects/app.rb:21:in `block in '
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:1265:in `call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:1265:in `block in compile!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `[]'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `block (3 levels) in route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:851:in `route_eval'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `block (2 levels) in route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:872:in `block in process_route'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:870:in `catch'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:870:in `process_route'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:834:in `block in route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:833:in `每个'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:833:in `route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:936:in `dispatch!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:769:in `block in call!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `block in invoke'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `catch'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `invoke'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:769:in `call!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:755:in `call'
/var/lib/gems/1.9.1/gems/rack-flash3-1.0.1/lib/rack/flash.rb:120:in `call'
/var/lib/gems/1.9.1/gems/rack-timeout-0.0.3/lib/rack/timeout.rb:16:in `block in call'
/usr/lib/ruby/1.9.1/timeout.rb:68:in `timeout'
/var/lib/gems/1.9.1/gems/rack-timeout-0.0.3/lib/rack/timeout.rb:16:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/session/abstract/id.rb:205:in `context'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/session/abstract/id.rb:200:in `call'
/var/lib/gems/1.9.1/gems/rack-protection-1.2.0/lib/rack/protection/xss_header.rb:22:in `call'
/var/lib/gems/1.9.1/gems/rack-protection-1.2.0/lib/rack/protection/path_traversal.rb:16:in `call'
/var/lib/gems/1.9.1/gems/rack-protection-1.2.0/lib/rack/protection/json_csrf.rb:17:in `call'
/var/lib/gems/1.9.1/gems/rack-protection-1.2.0/lib/rack/protection/base.rb:47:in `call'
/var/lib/gems/1.9.1/gems/rack-protection-1.2.0/lib/rack/protection/xss_header.rb:22:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/logger.rb:15:in `call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:129:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/head.rb:9:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/methodoverride.rb:21:in `call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/showexceptions.rb:21:in `call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:99:in `call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:1389:in `block in call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:1471：在“同步”中
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:1389:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:134:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/urlmap.rb:64:in `block in call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/urlmap.rb:49:in `each'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/urlmap.rb:49:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/lint.rb:48:in `_call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/lint.rb:36:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/showexceptions.rb:24:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/commonlogger.rb:20:in `call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:136:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/chunked.rb:43:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/content_length.rb:14:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/handler/webrick.rb:59:in `服务'
/usr/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `服务'
/usr/lib/ruby/1.9.1/webrick/httpserver.rb:94:在“运行”中
/usr/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
撬(#)>

好的，我安装

gem "debugger"

并添加断点

debugger

什么都没有发生。

日志文件不是我要找的。我只想调试一个 Sinatra 应用程序。我怎么做？

Answer 1

在您的 Gemfile 中：

gem "pry"
gem "pry-nav"

运行捆绑。然后每当脚本遇到binding.pry，您将打开一个外壳。你可以看到你在哪里whereami，你移动到下一行next，继续运行脚本continue。如果要检查变量，只需键入其名称。

有关更多信息，请参阅pry-nav。

Answer 2

撬调试器更好。并且您需要在模块化样式下运行 sinatra 应用程序。

我在 github 创建了一个 repo，它解释了如何使用 pry 进行调试。

这是回购：https ://github.com/hlee/sinatra_debugger_example

pry-debugger 和 pry-nav 的区别

撬调试器

如果你检查 pry-debugger 的源代码，你会看到：

# pry-debugger.gemspec
# Dependencies
gem.required_ruby_version = '>= 1.9.2'
gem.add_runtime_dependency 'pry', '>= 0.9.10'
gem.add_runtime_dependency 'debugger', '~> 1.3'
gem.add_development_dependency 'pry-remote', '~> 0.1.6'

这意味着，pry-debugger 仅支持 MRI 1.9.2 和 1.9.3。由于它依赖于调试器，Pry-debugger 将支持更快的跟踪、断点等。

撬导航

另一方面，这里是 pry-nav 来源：

# pry-nav.gemspec
# Dependencies
gem.required_ruby_version = '>= 1.8.7'
gem.add_runtime_dependency 'pry', '~> 0.9.10'
gem.add_development_dependency 'pry-remote', '~> 0.1.6'

这意味着，pry-nav 是一种纯 ruby​​ 方法，不依赖于调试器。将支持 1.8.7，不支持断点和调试器的一些其他功能。

断点

break SomeClass#run           # Break at the start of `SomeClass#run`.
break Foo#bar if baz?         # Break at `Foo#bar` only if `baz?`.
break app/models/user.rb:15   # Break at line 15 in user.rb.
break 14                      # Break at line 14 in the current file.

break --condition 4 x > 2     # Change condition on breakpoint #4 to 'x > 2'.
break --condition 3           # Remove the condition on breakpoint #3.

break --delete 5              # Delete breakpoint #5.
break --disable-all           # Disable all breakpoints.

break                         # List all breakpoints. (Same as `breakpoints`)
break --show 2                # Show details about breakpoint #2.

笔记

pry-nav 和 pry-debugger 不能一起加载。