Class: Harnex::Codex::AppServer::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/harnex/codex/app_server/client.rb

Overview

Extracted from Adapters::CodexAppServer per issue #41 Slice A. Pure move; behavior unchanged.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(read_io:, write_io:, pid: nil) ⇒ Client

Returns a new instance of Client.



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# File 'lib/harnex/codex/app_server/client.rb', line 12

def initialize(read_io:, write_io:, pid: nil)
  @read_io = read_io
  @write_io = write_io
  @pid = pid
  @next_id = 1
  @pending = {}
  @id_mutex = Mutex.new
  @write_mutex = Mutex.new
  @notification_handler = nil
  @request_handler = nil
  @disconnect_handler = nil
  @disconnect_signaled = false
  @closed = false
  @reader_thread = nil
end

Instance Attribute Details

#pid ⇒ Object (readonly)

Returns the value of attribute pid.



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# File 'lib/harnex/codex/app_server/client.rb', line 10

def pid
  @pid
end

Class Method Details

.spawn(deployment_config:) ⇒ Object

Plan 30 Phase 2 — deployment-fallback subprocess restart.

Spawns a ‘codex app-server` subprocess against a deployment_config and wraps it in a fresh Client. Caller is responsible for wiring handlers and running the JSON-RPC handshake — or use `spawn_with_fallback` for the full restart-with-resume flow.

Raises:

  • (ArgumentError) 


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# File 'lib/harnex/codex/app_server/client.rb', line 125

def self.spawn(deployment_config:)
  command = deployment_config[:command] || deployment_config["command"]
  raise ArgumentError, "deployment_config requires :command" if command.nil? || Array(command).empty?

  env = deployment_config[:env] || deployment_config["env"] || {}
  cwd = deployment_config[:cwd] || deployment_config["cwd"]

  opts = {}
  opts[:chdir] = cwd if cwd

  stdin_io, stdout_io, _stderr_io, wait_thr = Open3.popen3(env, *Array(command), **opts)
  new(read_io: stdout_io, write_io: stdin_io, pid: wait_thr.pid)
end

.spawn_with_fallback(prior_thread_id:, deployment_config:, handshake_params:, notification_handler: nil, request_handler: nil, disconnect_handler: nil) ⇒ Object

Plan 30 Phase 2 — full subprocess restart for deployment fallback.

Spawns a new subprocess against the alternate deployment, wires the supplied handlers, runs the initialize handshake, and resumes the prior threadId. Returns the started Client.

Handlers are installed before the reader thread starts so no post-handshake notification is dropped.

Raises:

  • (ArgumentError) 


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# File 'lib/harnex/codex/app_server/client.rb', line 147

def self.spawn_with_fallback(prior_thread_id:, deployment_config:, handshake_params:,
                              notification_handler: nil, request_handler: nil,
                              disconnect_handler: nil)
  raise ArgumentError, "prior_thread_id required" if prior_thread_id.nil? || prior_thread_id.to_s.empty?

  client = spawn(deployment_config: deployment_config)
  client.on_notification(&notification_handler) if notification_handler
  client.on_request(&request_handler) if request_handler
  client.on_disconnect(&disconnect_handler) if disconnect_handler
  client.start

  begin
    client.request("initialize", handshake_params)
    client.notify("initialized", {})
    client.request("thread/resume", { threadId: prior_thread_id })
  rescue StandardError
    client.close
    raise
  end

  client
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/harnex/codex/app_server/client.rb', line 71

def close
  return if @closed

  @closed = true

  @id_mutex.synchronize do
    @pending.each_value { |q| q.push(StandardError.new("codex_appserver client closed")) }
    @pending.clear
  end

  begin
    @write_io.close unless @write_io.closed?
  rescue IOError
    nil
  end

  if @pid && process_alive?(@pid)
    sleep 0.05
    begin
      Process.kill("TERM", @pid)
    rescue Errno::ESRCH
      nil
    end
  end

  @reader_thread&.join(2)
end

#notify(method, params = {}) ⇒ Object 



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# File 'lib/harnex/codex/app_server/client.rb', line 65

def notify(method, params = {})
  return if @closed

  write_line({ jsonrpc: "2.0", method: method, params: params })
end

#on_disconnect(&block) ⇒ Object 



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# File 'lib/harnex/codex/app_server/client.rb', line 39

def on_disconnect(&block)
  @disconnect_handler = block
end

#on_notification(&block) ⇒ Object 



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# File 'lib/harnex/codex/app_server/client.rb', line 28

def on_notification(&block)
  @notification_handler = block
end

#on_request(&block) ⇒ Object

Handler for server-initiated requests (id + method). The block receives (method, params) and returns the response body for the JSON-RPC ‘result` field, or nil to reject with -32601.



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# File 'lib/harnex/codex/app_server/client.rb', line 35

def on_request(&block)
  @request_handler = block
end

#request(method, params = {}) ⇒ Object 



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# File 'lib/harnex/codex/app_server/client.rb', line 47

def request(method, params = {})
  raise "codex_appserver client is closed" if @closed

  queue = Queue.new
  id = @id_mutex.synchronize do
    assigned = @next_id
    @next_id += 1
    @pending[assigned] = queue
    assigned
  end

  write_line({ jsonrpc: "2.0", id: id, method: method, params: params })
  result = queue.pop
  raise result if result.is_a?(Exception)

  result
end

#start ⇒ Object 



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# File 'lib/harnex/codex/app_server/client.rb', line 43

def start
  @reader_thread = Thread.new { read_loop }
end

#stop_for_fallback(in_flight_turn: nil, term_grace_seconds: 0.5, kill_grace_seconds: 1.0, interrupt_grace_seconds: 0.5) ⇒ Object

Plan 30 Phase 2 — graceful stop ahead of a deployment switch.

Best-effort: issues ‘turn/interrupt` for any in-flight turn (bounded by interrupt_grace_seconds), drains pending RPC, and tears the subprocess down with the same TERM/KILL escalation used by `terminate_process`.



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# File 'lib/harnex/codex/app_server/client.rb', line 176

def stop_for_fallback(in_flight_turn: nil,
                      term_grace_seconds: 0.5,
                      kill_grace_seconds: 1.0,
                      interrupt_grace_seconds: 0.5)
  if in_flight_turn && !@closed
    interrupt_thread = Thread.new do
      begin
        request("turn/interrupt", in_flight_turn)
      rescue StandardError
        nil
      end
    end
    interrupt_thread.kill unless interrupt_thread.join(interrupt_grace_seconds)
  end

  return true if @closed

  @closed = true

  fail_pending_requests(StandardError.new("codex_appserver client closed for fallback"))

  begin
    @write_io.close unless @write_io.closed?
  rescue IOError
    nil
  end

  terminated =
    if @pid
      terminate_process(
        term_grace_seconds: term_grace_seconds,
        kill_grace_seconds: kill_grace_seconds
      )
    else
      true
    end

  @reader_thread&.join(2)
  terminated
end

#terminate_process(term_grace_seconds:, kill_grace_seconds:) ⇒ Object 



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# File 'lib/harnex/codex/app_server/client.rb', line 99

def terminate_process(term_grace_seconds:, kill_grace_seconds:)
  return false unless @pid

  begin
    Process.kill("TERM", @pid)
  rescue Errno::ESRCH
    return true
  end

  return true if wait_for_process_exit(@pid, term_grace_seconds)

  begin
    Process.kill("KILL", @pid)
  rescue Errno::ESRCH
    return true
  end

  wait_for_process_exit(@pid, kill_grace_seconds)
end