Module: AgentClientProtocol::Stdio

Defined in:
lib/agent_client_protocol/stdio.rb

Constant Summary collapse

SHUTDOWN_TIMEOUT =

seconds

5

Class Method Summary collapse

Class Method Details

.clean_environment(extra = nil) ⇒ Object 



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# File 'lib/agent_client_protocol/stdio.rb', line 119

def clean_environment(extra = nil)
  env = {}
  # Minimal safe environment
  %w[PATH HOME USER LANG TERM].each do |key|
    env[key] = ENV[key] if ENV[key]
  end
  env.merge!(extra) if extra
  env
end

.run_agent(agent) ⇒ Object 



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# File 'lib/agent_client_protocol/stdio.rb', line 11

def run_agent(agent)
  Async do
    reader = Transport::NdjsonReader.new($stdin)
    writer = Transport::NdjsonWriter.new($stdout)

    # Redirect any puts/print to stderr so stdout is reserved for protocol
    $stdout = $stderr

    conn = Agent::Connection.new(agent, reader, writer)
    conn.listen
  end
end

.shutdown_process(conn, pid, stdin_w, listen_task) ⇒ Object 



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# File 'lib/agent_client_protocol/stdio.rb', line 84

def shutdown_process(conn, pid, stdin_w, listen_task)
  listen_task&.stop
  conn.close

  # Close stdin to signal the subprocess
  stdin_w.close unless stdin_w.closed?

  # Use a thread for waitpid to avoid blocking the async reactor
  reap_thread = Thread.new do
    begin
      Process.waitpid(pid)
    rescue Errno::ECHILD, Errno::ESRCH
      # Already reaped
    end
  end

  unless reap_thread.join(SHUTDOWN_TIMEOUT)
    begin
      Process.kill("TERM", pid)
    rescue Errno::ESRCH
      # Already gone
    end
    unless reap_thread.join(SHUTDOWN_TIMEOUT)
      begin
        Process.kill("KILL", pid)
      rescue Errno::ESRCH
        # Already gone
      end
      reap_thread.join(1)
    end
  end
rescue Errno::ECHILD, Errno::ESRCH
  # Process already gone
end

.spawn_agent_process(client, command, *args, env: nil, cwd: nil) ⇒ Object 



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# File 'lib/agent_client_protocol/stdio.rb', line 24

def spawn_agent_process(client, command, *args, env: nil, cwd: nil)
  Async do |task|
    pid, stdin_w, stdout_r = spawn_process(command, *args, env: env, cwd: cwd)

    reader = Transport::NdjsonReader.new(stdout_r)
    writer = Transport::NdjsonWriter.new(stdin_w)
    conn = Client::Connection.new(client, reader, writer)

    listen_task = task.async { conn.listen }

    if block_given?
      begin
        yield conn, pid
      ensure
        shutdown_process(conn, pid, stdin_w, listen_task)
      end
    else
      [conn, pid, listen_task]
    end
  end
end

.spawn_client_process(agent, command, *args, env: nil, cwd: nil) ⇒ Object 



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# File 'lib/agent_client_protocol/stdio.rb', line 46

def spawn_client_process(agent, command, *args, env: nil, cwd: nil)
  Async do |task|
    pid, stdin_w, stdout_r = spawn_process(command, *args, env: env, cwd: cwd)

    reader = Transport::NdjsonReader.new(stdout_r)
    writer = Transport::NdjsonWriter.new(stdin_w)
    conn = Agent::Connection.new(agent, reader, writer)

    listen_task = task.async { conn.listen }

    if block_given?
      begin
        yield conn, pid
      ensure
        shutdown_process(conn, pid, stdin_w, listen_task)
      end
    else
      [conn, pid, listen_task]
    end
  end
end

.spawn_process(command, *args, env: nil, cwd: nil) ⇒ Object 



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# File 'lib/agent_client_protocol/stdio.rb', line 68

def spawn_process(command, *args, env: nil, cwd: nil)
  spawn_env = clean_environment(env)
  opts = {in: :pipe, out: :pipe, err: $stderr}
  opts[:chdir] = cwd if cwd

  stdin_r, stdin_w = IO.pipe
  stdout_r, stdout_w = IO.pipe

  pid = Process.spawn(spawn_env, command, *args, in: stdin_r, out: stdout_w, err: $stderr, **(cwd ? {chdir: cwd} : {}))

  stdin_r.close
  stdout_w.close

  [pid, stdin_w, stdout_r]
end