Attach to Chrome if it exists

Author: 小野 直人

lib/debug/config.rb

@@ -37,13 +37,14 @@ module DEBUGGER__
     save_history:   ['RUBY_DEBUG_SAVE_HISTORY',"BOOT: maximum save history lines (default: 10,000)"],
 
     # remote setting
-    port:           ['RUBY_DEBUG_PORT',         "REMOTE: TCP/IP remote debugging: port"],
-    host:           ['RUBY_DEBUG_HOST',         "REMOTE: TCP/IP remote debugging: host (localhost if not given)"],
-    sock_path:      ['RUBY_DEBUG_SOCK_PATH',    "REMOTE: UNIX Domain Socket remote debugging: socket path"],
-    sock_dir:       ['RUBY_DEBUG_SOCK_DIR',     "REMOTE: UNIX Domain Socket remote debugging: socket directory"],
-    cookie:         ['RUBY_DEBUG_COOKIE',       "REMOTE: Cookie for negotiation"],
-    open_frontend:  ['RUBY_DEBUG_OPEN_FRONTEND',"REMOTE: frontend used by open command (vscode, chrome, default: rdbg)."],
-    chrome_path:    ['RUBY_DEBUG_CHROME_PATH',  "REMOTE: Current path in Google Chrome"],
+    port:                ['RUBY_DEBUG_PORT',         "REMOTE: TCP/IP remote debugging: port"],
+    host:                ['RUBY_DEBUG_HOST',         "REMOTE: TCP/IP remote debugging: host (localhost if not given)"],
+    sock_path:           ['RUBY_DEBUG_SOCK_PATH',    "REMOTE: UNIX Domain Socket remote debugging: socket path"],
+    sock_dir:            ['RUBY_DEBUG_SOCK_DIR',     "REMOTE: UNIX Domain Socket remote debugging: socket directory"],
+    cookie:              ['RUBY_DEBUG_COOKIE',       "REMOTE: Cookie for negotiation"],
+    open_frontend:       ['RUBY_DEBUG_OPEN_FRONTEND',"REMOTE: frontend used by open command (vscode, chrome, default: rdbg)."],
+    chrome_path:         ['RUBY_DEBUG_CHROME_PATH',  "REMOTE: Current path in Google Chrome"],
+    chrome_history_file: ['RUBY_DEBUG_CHROME_HISTORY_FILE', "REMOTE: history file of Chrome setup (default: ~/.rdbg_chrome_history)"],
 
     # obsolete
     parent_on_fork: ['RUBY_DEBUG_PARENT_ON_FORK', "OBSOLETE: Keep debugging parent process on fork (default: false)",     :bool],

lib/debug/server.rb

@@ -81,10 +81,7 @@ def activate session, on_fork: false
           @q_msg = nil
           @q_ans.close
           @q_ans = nil
-          if CONFIG[:open_frontend] == 'chrome'
-            Process.kill(:KILL, @wait_thr.pid)
-            FileUtils.remove_entry_secure @dir
-          end
+          FileUtils.rm_rf @dir if @dir
         end # accept
 
       rescue Terminate
@@ -298,7 +295,6 @@ def readline prompt
 
     def pause
       # $stderr.puts "DEBUG: pause request"
-      Process.kill(:SIGURG, Process.pid)
     end
 
     def quit n
@@ -377,7 +373,6 @@ def accept
       end
     ensure
       @sock_for_fork = nil
-      Process.kill(:KILL, @wait_thr.pid) if CONFIG[:open_frontend] == 'chrome'
     end
   end
 

lib/debug/server_cdp.rb

@@ -13,26 +13,18 @@ def setup_chrome
       require 'open3'
       require 'tmpdir'
 
-      set_chrome_path
-      @dir = Dir.mktmpdir
-      # The command line flags are based on: https://developer.mozilla.org/en-US/docs/Tools/Remote_Debugging/Chrome_Desktop#connecting
-      stdin, stdout, stderr, @wait_thr = *Open3.popen3("#{CONFIG[:chrome_path]} --remote-debugging-port=0 --no-first-run --no-default-browser-check --user-data-dir=#{@dir}")
-      stdin.close
-      stdout.close
-
-      data = stderr.readpartial 4096
-      if data.match /DevTools listening on ws:\/\/127.0.0.1:(\d+)(.*)/
-        port = $1
-        path = $2
+      if File.exist? p = history_file
+        port, path = File.read(p).split("\n")
       else
-        if File.exist? "#{@dir}/DevToolsActivePort"
-          port, path = File.read("#{@dir}/DevToolsActivePort").split("\n")
-        else
-          raise "Can't open Chrome browser"
-        end
+        port, path = run_new_chrome
+      end
+      begin
+        s = Socket.tcp "127.0.0.1", port
+      rescue Errno::ECONNREFUSED
+        port, path = run_new_chrome
+        retry
       end
 
-      s = Socket.tcp "127.0.0.1", port
       ws_client = WebSocketClient.new(s)
       ws_client.handshake port, path
       ws_client.send id: 1, method: 'Target.getTargets'
@@ -59,6 +51,10 @@ def setup_chrome
       end
     end
 
+    def history_file
+      CONFIG[:chrome_history_file] || File.expand_path('~/.rdbg_chrome_history')
+    end
+
     def set_chrome_path
       # The process to check OS is based on `selenium` project.
       case RbConfig::CONFIG['host_os']
@@ -73,6 +69,29 @@ def set_chrome_path
       end
     end
 
+    def run_new_chrome
+      set_chrome_path
+      @dir = Dir.mktmpdir
+      # The command line flags are based on: https://developer.mozilla.org/en-US/docs/Tools/Remote_Debugging/Chrome_Desktop#connecting
+      stdin, stdout, stderr, @wait_thr = *Open3.popen3("#{CONFIG[:chrome_path]} --remote-debugging-port=0 --no-first-run --no-default-browser-check --user-data-dir=#{@dir}")
+      stdin.close
+      stdout.close
+
+      data = stderr.readpartial 4096
+      if data.match /DevTools listening on ws:\/\/127.0.0.1:(\d+)(.*)/
+        port = $1
+        path = $2
+      else
+        if File.exist? "#{@dir}/DevToolsActivePort"
+          port, path = File.read("#{@dir}/DevToolsActivePort").split("\n")
+        else
+          raise "Can't open Chrome browser"
+        end
+      end
+      f = File.open(history_file, "w") { |f| f.print "#{port}\n#{path}" }
+      [port, path]
+    end
+
     class WebSocketClient
       def initialize s
         @sock = s