Support BasicObject in Chrome debugging

Author: ono-max

lib/debug/server.rb

@@ -4,6 +4,8 @@
 require 'etc'
 require_relative 'config'
 require_relative 'version'
+require 'json'
+require 'securerandom'
 
 module DEBUGGER__
   class UI_ServerBase < UI_Base
@@ -22,6 +24,7 @@ def initialize
 
     class Terminate < StandardError; end
     class GreetingError < StandardError; end
+    class RetryConnection < StandardError; end
 
     def deactivate
       @reader_thread.raise Terminate
@@ -78,6 +81,8 @@ def activate session, on_fork: false
           next
         rescue Terminate
           raise # should catch at outer scope
+        rescue RetryConnection
+          next
         rescue => e
           DEBUGGER__.warn "ReaderThreadError: #{e}"
           pp e.backtrace
@@ -157,7 +162,30 @@ def greeting
         @need_pause_at_first = false
         dap_setup @sock.read($1.to_i)
 
-      when /^GET \/.* HTTP\/1.1/
+      when /^GET \/json\/version HTTP\/1.1/
+        
+        body = {
+          Browser: "ruby/v#{RUBY_VERSION}",
+          'Protocol-Version': "1.1"
+        }
+        send_http_res body
+        raise RetryConnection
+
+      when /^GET \/json HTTP\/1.1/
+        addr = @local_addr.inspect_sockaddr
+        body = [{
+          description: "ruby instance",
+          devtoolsFrontendUrl: "devtools://devtools/bundled/inspector.html?experiments=true&v8only=true&ws=#{addr}/#{@uuid}",
+          id: @uuid,
+          title: $0,
+          type: "json",
+          url: "file://#{File.absolute_path($0)}",
+          webSocketDebuggerUrl: "ws://#{addr}/#{@uuid}"
+        }]
+        send_http_res body
+        raise RetryConnection
+
+      when /^GET \/#{@uuid} HTTP\/1.1/
         require_relative 'server_cdp'
 
         self.extend(UI_CDP)
@@ -172,6 +200,12 @@ def greeting
       end
     end
 
+    def send_http_res body
+      json = JSON.generate body
+      header = "HTTP/1.0 200 OK\r\nContent-Type: application/json; charset=UTF-8\r\nCache-Control: no-cache\r\nContent-Length: #{json.bytesize}\r\n\r\n"
+      @sock.puts "#{header}#{json}"
+    end
+
     def process
       while true
         DEBUGGER__.info "sleep IO.select"
@@ -395,18 +429,19 @@ def initialize host: nil, port: nil
           raise "Specify digits for port number"
         end
       end
+      @uuid = SecureRandom.uuid # for CDP
 
       super()
     end
 
     def chrome_setup
       require_relative 'server_cdp'
 
-      unless @chrome_pid = UI_CDP.setup_chrome(@local_addr.inspect_sockaddr)
+      unless @chrome_pid = UI_CDP.setup_chrome(@local_addr.inspect_sockaddr, @uuid)
         DEBUGGER__.warn <<~EOS
           With Chrome browser, type the following URL in the address-bar:
 
-             devtools://devtools/bundled/inspector.html?v8only=true&panel=sources&ws=#{@local_addr.inspect_sockaddr}/#{SecureRandom.uuid}
+             devtools://devtools/bundled/inspector.html?v8only=true&panel=sources&ws=#{@local_addr.inspect_sockaddr}/#{@uuid}
 
           EOS
       end

lib/debug/server_cdp.rb

@@ -13,7 +13,7 @@ module UI_CDP
     SHOW_PROTOCOL = ENV['RUBY_DEBUG_CDP_SHOW_PROTOCOL'] == '1'
 
     class << self
-      def setup_chrome addr
+      def setup_chrome addr, uuid
         return if CONFIG[:chrome_path] == ''
 
         port, path, pid = run_new_chrome
@@ -51,7 +51,7 @@ def setup_chrome addr
             ws_client.send sessionId: s_id, id: 5,
                           method: 'Page.navigate',
                           params: {
-                            url: "devtools://devtools/bundled/inspector.html?v8only=true&panel=sources&ws=#{addr}/#{SecureRandom.uuid}",
+                            url: "devtools://devtools/bundled/inspector.html?v8only=true&panel=sources&ws=#{addr}/#{uuid}",
                             frameId: f_id
                           }
           when res['method'] == 'Page.loadEventFired'