如何在開發中調試卡住的 Rails 進程？

Question

我正在將我的舊 Rails 4.2 應用程序升級到 Rails 5。我目前正在嘗試使其在 5.1 上工作。 當我嘗試訪問正在開發的應用程序的頁面時，它似乎可以正常啟動並開始呈現。 瀏覽器永遠不會收到來自服務器的響應，服務器只是停止輸出到日志。 我無法弄清楚發生了什么。

我怎樣才能進一步調試它為什么掛起並且從不響應？

Output rails s :

=> Booting Puma
=> Rails 5.1.7 application starting in development 
=> Run `rails server -h` for more startup options
Puma starting in single mode...
* Version 4.3.3 (ruby 2.6.5-p114), codename: Mysterious Traveller
* Min threads: 1, max threads: 1
* Environment: development
* Listening on tcp://127.0.0.1:3000
* Listening on tcp://[::1]:3000
Use Ctrl-C to stop
I, [2020-04-27T15:18:05.059708 #75800]  INFO -- : [83adaf81-4bf7-4870-b5f8-b6c0c11a4d2b] Started GET "/" for 127.0.0.1 at 2020-04-27 15:18:05 +0200
D, [2020-04-27T15:18:05.608709 #75800] DEBUG -- : [83adaf81-4bf7-4870-b5f8-b6c0c11a4d2b]    (3.6ms)  SELECT "schema_migrations"."version" FROM "schema_migrations" ORDER BY "schema_migrations"."version" ASC /*application:MyApp*/
I, [2020-04-27T15:18:06.590249 #75800]  INFO -- : [83adaf81-4bf7-4870-b5f8-b6c0c11a4d2b] Processing by MyAppController#front_page as HTML
D, [2020-04-27T15:18:06.613950 #75800] DEBUG -- : [83adaf81-4bf7-4870-b5f8-b6c0c11a4d2b]   User Load (0.7ms)  SELECT  "da"."users".* FROM "da"."users" WHERE "da"."users"."auth_token" = $1 LIMIT $2 /*application:MyApp,line:/app/controllers/controller_concerns/session_handling.rb:35:in `current_user'*/  [["auth_token", "uWOt-zCVDbo8a6AT-SkWUQ"], ["LIMIT", 1]]
I, [2020-04-27T15:18:06.766078 #75800]  INFO -- : [83adaf81-4bf7-4870-b5f8-b6c0c11a4d2b]   Rendering myapp/front_page.html.haml within layouts/front_page
D, [2020-04-27T15:18:06.866720 #75800] DEBUG -- : [83adaf81-4bf7-4870-b5f8-b6c0c11a4d2b]   Car Load (3.1ms)  SELECT  "cars".* FROM "cars" WHERE "cars"."user_id" = $1 AND "cars"."sales_state" = $2 ORDER BY "cars"."id" DESC LIMIT $3 /*application:MyApp,controller:myapp,action:front_page,controller_with_namespace:MyAppController,line:/app/controllers/controller_concerns/user_listings.rb:11:in `last_on_hold_listing'*/  [["user_id", 900000000], ["sales_state", "on_hold"], ["LIMIT", 1]]
D, [2020-04-27T15:18:06.929863 #75800] DEBUG -- : [Redis] command=GET args="da/brands_and_model_names/v1.0"
D, [2020-04-27T15:18:06.932895 #75800] DEBUG -- : [Redis] call_time=2.90 ms
I, [2020-04-27T15:18:07.071685 #75800]  INFO -- : [83adaf81-4bf7-4870-b5f8-b6c0c11a4d2b]   Rendered partials/_extended_search_form.html.haml (193.3ms)
I, [2020-04-27T15:18:07.242322 #75800]  INFO -- : [83adaf81-4bf7-4870-b5f8-b6c0c11a4d2b]   Rendered partials/_front_page_featured_items.html.haml (160.4ms)

它只是停在看起來要在 rails 中完成處理的地方，並且應該將響應發送到瀏覽器。 相反，它就像我在代碼中有一個binding.pry一樣掛起 - 但我沒有。 日志中沒有發出任何內容。 我什至無法停止服務器，我必須手動將其殺死。 ruby 進程的 CPU 在 0% 時處於空閑狀態。

順便說一句， rails console工作正常。

我還能做些什么來弄清楚它卡在哪里？

UDPATE

我懷疑它可能與資產編譯有關。 在我的舊 rails 4.2 分支中，到達日志中的特定點后，它將開始在開發中即時編譯資產，但是在 rails 5.2 分支中不會發生這種情況。 現在運行時： bin/rails assets:precompile我得到：

yarn install v1.22.4
warning package.json: No license field
warning package-lock.json found. Your project contains lock files generated by tools other than Yarn. It is advised not to mix package managers in order to avoid resolution inconsistencies caused by unsynchronized lock files. To clear this warning, remove package-lock.json.
warning No license field
[1/4] 🔍  Resolving packages...
success Already up-to-date.
✨  Done in 0.72s.
yarn install v1.22.4
warning package.json: No license field
warning package-lock.json found. Your project contains lock files generated by tools other than Yarn. It is advised not to mix package managers in order to avoid resolution inconsistencies caused by unsynchronized lock files. To clear this warning, remove package-lock.json.
warning No license field
[1/4] 🔍  Resolving packages...
success Already up-to-date.
✨  Done in 0.60s.
rails aborted!
ExecJS::RuntimeError: SyntaxError: [stdin]:1:1: unexpected //=
compile ((execjs):7528:19)
eval (eval at <anonymous> ((execjs):7539:8), <anonymous>:1:10)
(execjs):7539:8
(execjs):7545:14
(execjs):1:40
Object.<anonymous> ((execjs):1:58)
Module._compile (internal/modules/cjs/loader.js:1156:30)
Object.Module._extensions..js (internal/modules/cjs/loader.js:1176:10)
Module.load (internal/modules/cjs/loader.js:1000:32)
Function.Module._load (internal/modules/cjs/loader.js:899:14)
Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12)
internal/main/run_main_module.js:18:47
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/execjs-2.7.0/lib/execjs/external_runtime.rb:39:in `exec'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/execjs-2.7.0/lib/execjs/external_runtime.rb:21:in `eval'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/execjs-2.7.0/lib/execjs/external_runtime.rb:46:in `call'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/coffee-script-2.4.1/lib/coffee_script.rb:78:in `compile'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/coffee_script_processor.rb:24:in `block in call'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/cache.rb:92:in `fetch'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/coffee_script_processor.rb:23:in `call'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:84:in `call_processor'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:65:in `reverse_each'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:65:in `call_processors'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:22:in `block in <class:CompositeProcessor>'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:33:in `call'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:84:in `call_processor'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:65:in `reverse_each'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:65:in `call_processors'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/loader.rb:182:in `load_from_unloaded'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/loader.rb:59:in `block in load'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/loader.rb:335:in `fetch_asset_from_dependency_cache'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/loader.rb:43:in `load'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/cached_environment.rb:44:in `load'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/bundle.rb:41:in `block in call'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/utils.rb:167:in `dfs'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/bundle.rb:42:in `call'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:84:in `call_processor'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:65:in `reverse_each'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:65:in `call_processors'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/loader.rb:182:in `load_from_unloaded'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/loader.rb:59:in `block in load'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/loader.rb:335:in `fetch_asset_from_dependency_cache'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/loader.rb:43:in `load'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/cached_environment.rb:44:in `load'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/bundle.rb:32:in `block in call'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/bundle.rb:31:in `call'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:84:in `call_processor'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:65:in `reverse_each'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:65:in `call_processors'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/loader.rb:182:in `load_from_unloaded'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/loader.rb:59:in `block in load'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/loader.rb:335:in `fetch_asset_from_dependency_cache'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/loader.rb:43:in `load'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/cached_environment.rb:44:in `load'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/base.rb:81:in `find_asset'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/base.rb:88:in `find_all_linked_assets'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/sprockets-4.0.0/lib/sprockets/manifest.rb:125:in `block (2 levels) in find'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/safe_task_executor.rb:24:in `block in execute'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:41:in `block in synchronize'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:41:in `synchronize'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:41:in `synchronize'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/safe_task_executor.rb:19:in `execute'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/promise.rb:563:in `block in realize'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:353:in `run_task'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:342:in `block (3 levels) in create_worker'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:325:in `loop'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:325:in `block (2 levels) in create_worker'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:324:in `catch'
/Users/nielsk/.rvm/gems/ruby-2.6.5@rails52/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:324:in `block in create_worker'
Tasks: TOP => assets:precompile
(See full trace by running task with --trace)

這可能是什么？

Answer 1

檢查您是否使用//=語法來要求 CoffeeScript 文件中的文件。 顯然，在 sprockets 4 中不再支持。

您應該將所有//= in.coffee 文件替換為#=

免責聲明：我正在從事與 OP 相同的項目:)