erlang 如何调试phoenix框架的日志错误？

bttbmeg0 于 2022-12-16 发布在 Erlang

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我正在安装此Pheonix Web应用程序：https://github.com/poanetwork/blockscout
安装完所有依赖项后，我运行以下命令（遵循文档）：

$ mix phx.server

字符串
并得到错误：

$ iex -S mix phx.server
Erlang/OTP 25 [erts-13.1.2] [source] [64-bit] [smp:2:2] [ds:2:2:10] [async-threads:1] [jit:ns]

2022-12-13T04:25:43.083 [notice] Application ethereum_jsonrpc exited: EthereumJSONRPC.Application.start(:normal, []) returned an error: shutdown: failed to start child: :worker
    ** (EXIT) an exception was raised:
        ** (MatchError) no match of right hand side value: {:error, :badarg}
            (poolboy 1.5.2) /opt/app/blockscout/deps/poolboy/src/poolboy.erl:283: :poolboy.new_worker/1
            (poolboy 1.5.2) /opt/app/blockscout/deps/poolboy/src/poolboy.erl:304: :poolboy.prepopulate/3
            (poolboy 1.5.2) /opt/app/blockscout/deps/poolboy/src/poolboy.erl:153: :poolboy.init/3
            (stdlib 4.1.1) gen_server.erl:851: :gen_server.init_it/2
            (stdlib 4.1.1) gen_server.erl:814: :gen_server.init_it/6
            (stdlib 4.1.1) proc_lib.erl:240: :proc_lib.init_p_do_apply/3
2022-12-13T04:25:43.106 [notice] Application poolboy exited: :stopped
2022-12-13T04:25:43.106 [notice] Application decorator exited: :stopped
2022-12-13T04:25:43.106 [notice] Application decimal exited: :stopped
2022-12-13T04:25:43.106 [notice] Application websocket_client exited: :stopped
2022-12-13T04:25:43.106 [notice] Application ex_abi exited: :stopped
2022-12-13T04:25:43.106 [notice] Application ex_keccak exited: :stopped
2022-12-13T04:25:43.106 [notice] Application rustler exited: :stopped
2022-12-13T04:25:43.107 [notice] Application timex exited: :stopped
2022-12-13T04:25:43.107 [notice] Application gettext exited: :stopped
2022-12-13T04:25:43.108 [notice] Application combine exited: :stopped
2022-12-13T04:25:43.110 [notice] Application tzdata exited: :stopped
2022-12-13T04:25:43.110 [notice] Application spandex_datadog exited: :stopped
2022-12-13T04:25:43.111 [notice] Application msgpax exited: :stopped
2022-12-13T04:25:43.111 [notice] Application spandex exited: :stopped
2022-12-13T04:25:43.111 [notice] Application plug exited: :stopped
2022-12-13T04:25:43.111 [notice] Application telemetry exited: :stopped
2022-12-13T04:25:43.112 [notice] Application plug_crypto exited: :stopped
2022-12-13T04:25:43.112 [notice] Application mime exited: :stopped
2022-12-13T04:25:43.112 [notice] Application eex exited: :stopped
2022-12-13T04:25:43.112 [notice] Application optimal exited: :stopped
2022-12-13T04:25:43.112 [notice] Application logger_file_backend exited: :stopped
2022-12-13T04:25:43.112 [notice] Application jason exited: :stopped
2022-12-13T04:25:43.112 [notice] Application httpoison exited: :stopped
2022-12-13T04:25:43.113 [notice] Application hackney exited: :stopped
2022-12-13T04:25:43.113 [notice] Application metrics exited: :stopped
2022-12-13T04:25:43.113 [notice] Application ssl_verify_fun exited: :stopped
2022-12-13T04:25:43.113 [notice] Application parse_trans exited: :stopped
2022-12-13T04:25:43.113 [notice] Application syntax_tools exited: :stopped
2022-12-13T04:25:43.113 [notice] Application mimerl exited: :stopped
2022-12-13T04:25:43.113 [notice] Application idna exited: :stopped
2022-12-13T04:25:43.113 [notice] Application unicode_util_compat exited: :stopped
2022-12-13T04:25:43.113 [notice] Application cowboy exited: :stopped
2022-12-13T04:25:43.114 [notice] Application ranch exited: :stopped
2022-12-13T04:25:43.114 [notice] Application cowlib exited: :stopped
2022-12-13T04:25:43.114 [notice] Application certifi exited: :stopped
** (Mix) Could not start application ethereum_jsonrpc: EthereumJSONRPC.Application.start(:normal, []) returned an error: shutdown: failed to start child: :worker
    ** (EXIT) an exception was raised:
        ** (MatchError) no match of right hand side value: {:error, :badarg}
            (poolboy 1.5.2) /opt/app/blockscout/deps/poolboy/src/poolboy.erl:283: :poolboy.new_worker/1
            (poolboy 1.5.2) /opt/app/blockscout/deps/poolboy/src/poolboy.erl:304: :poolboy.prepopulate/3
            (poolboy 1.5.2) /opt/app/blockscout/deps/poolboy/src/poolboy.erl:153: :poolboy.init/3
            (stdlib 4.1.1) gen_server.erl:851: :gen_server.init_it/2
            (stdlib 4.1.1) gen_server.erl:814: :gen_server.init_it/6
            (stdlib 4.1.1) proc_lib.erl:240: :proc_lib.init_p_do_apply/3

我发现没有源代码的堆栈跟踪，所有可以看到的堆栈跟踪都是依赖项的。
所以我问题是：如何知道此错误的which line of the source code发生在？
谢谢。

erlang

来源：https://stackoverflow.com/questions/74779981/how-to-debug-phoenix-frameworks-log-error

2条答案

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w7t8yxp51#

错误发生在应用程序尝试启动之前。

ErlangVM* 尝试启动所有依赖于您的应用程序，并且错误

Application ethereum_jsonrpc exited:
     EthereumJSONRPC.Application.start(:normal, []) returned an error:
       shutdown: failed to start child: :worker
    ** (EXIT) an exception was raised:
        ** (MatchError) no match of right hand side value: {:error, :badarg}

基本上意味着ethereum_jsonrpc应用程序无法启动，从而阻止ErlangVM尝试启动主应用程序。要缩小问题范围，可以尝试显式启动失败的ethereum_jsonrpc，例如从与Application.ensure_all_started(:ethereum_jsonrpc)或更显式的EthereumJSONRPC.Application.start(:normal, [])的iex会话启动。

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b91juud32#

好吧，我解决了。
最后我不知道哪一行代码失败了。

溶液

1.将许多调试日志打印到源代码中，并猜测在哪一步失败。

+    IO.puts "== config: #{ inspect config}"
+    IO.puts "== rolling_window_opts: #{ inspect rolling_window_opts}"

另外，在pheonix框架中，您可以从源代码文件的CalssName中猜出源代码文件，例如：
EthereumJSONRPC.ApplicationMap到apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/application.ex
2.更改记录器级别。
3.编辑config/config.exs文件以启用DB日志：

database: database_api,
   hostname: hostname_api,
   // add this line of code
   show_sensitive_data_on_connection_error: true

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erlang 如何调试phoenix框架的日志错误？

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