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Class: Kward::MCP::StdioTransport

Inherits:
Object
  • Object
show all
Defined in:
lib/kward/mcp/stdio_transport.rb

Overview

JSON-RPC transport for local MCP servers that communicate over stdio.

Constant Summary collapse

DEFAULT_TIMEOUT_SECONDS = 
10

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(command:, args: [], env: {}, timeout_seconds: DEFAULT_TIMEOUT_SECONDS) ⇒ StdioTransport

Returns a new instance of StdioTransport.



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# File 'lib/kward/mcp/stdio_transport.rb', line 15

def initialize(command:, args: [], env: {}, timeout_seconds: DEFAULT_TIMEOUT_SECONDS)
  @command = command.to_s
  @args = Array(args).map(&:to_s)
  @env = env || {}
  @timeout_seconds = timeout_seconds || DEFAULT_TIMEOUT_SECONDS
  @mutex = Mutex.new
  @started = false
end

Instance Attribute Details

#command ⇒ Object (readonly)

Returns the value of attribute command.



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# File 'lib/kward/mcp/stdio_transport.rb', line 13

def command
  @command
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/kward/mcp/stdio_transport.rb', line 40

def close
  @stdin&.close unless @stdin&.closed?
  @stdout&.close unless @stdout&.closed?
  @stderr&.close unless @stderr&.closed?
  @stderr_thread&.kill
  terminate_process
rescue IOError
  nil
end

#notify(method, params = nil) ⇒ Object 



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# File 'lib/kward/mcp/stdio_transport.rb', line 33

def notify(method, params = nil)
  @mutex.synchronize do
    start
    write_message({ jsonrpc: "2.0", method: method, params: params }.compact)
  end
end

#request(method, params = nil) ⇒ Object 



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# File 'lib/kward/mcp/stdio_transport.rb', line 24

def request(method, params = nil)
  @mutex.synchronize do
    start
    id = next_id
    write_message({ jsonrpc: "2.0", id: id, method: method, params: params }.compact)
    read_response(id)
  end
end