Class: Legion::MCP::Client::Connection

Inherits:
Object
  • Object
show all
Includes:
Logging::Helper
Defined in:
lib/legion/mcp/client/connection.rb

Overview

rubocop:disable Metrics/ClassLength

Constant Summary collapse

TOOL_CACHE_TTL =

seconds

300

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name:, transport:, **config) ⇒ Connection

Returns a new instance of Connection.



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# File 'lib/legion/mcp/client/connection.rb', line 15

def initialize(name:, transport:, **config)
  @name = name
  @transport_type = transport.to_sym
  @config = config
  @tools_cache = nil
  @tools_cached_at = nil
  @connected = false
  @mutex = Mutex.new
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/legion/mcp/client/connection.rb', line 11

def config
  @config
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/legion/mcp/client/connection.rb', line 11

def name
  @name
end

#transport_type ⇒ Object (readonly)

Returns the value of attribute transport_type.



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# File 'lib/legion/mcp/client/connection.rb', line 11

def transport_type
  @transport_type
end

Instance Method Details

#call_tool(name:, arguments: {}) ⇒ Object 



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# File 'lib/legion/mcp/client/connection.rb', line 99

def call_tool(name:, arguments: {})
  connect unless connected?
  LoggingSupport.info(
    'client.tool_call.start',
    connection: @name,
    transport:  @transport_type,
    tool_name:  name,
    arguments:  LoggingSupport.summarize_params(arguments)
  )
  result = execute_tool_call(name: name, arguments: arguments)
  LoggingSupport.info(
    'client.tool_call.complete',
    connection: @name,
    transport:  @transport_type,
    tool_name:  name,
    result:     LoggingSupport.summarize_result(result)
  )
  result
rescue StandardError => e
  handle_exception(e, level: :warn, operation: 'legion.mcp.client.connection.call_tool')
  LoggingSupport.warn(
    'client.tool_call.failed',
    connection: @name,
    transport:  @transport_type,
    tool_name:  name,
    error:      e.message
  )
  raise
end

#connect ⇒ Object 



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# File 'lib/legion/mcp/client/connection.rb', line 29

def connect
  @mutex.synchronize do
    return if @connected

    LoggingSupport.info(
      'client.connect.start',
      connection: @name,
      transport:  @transport_type,
      config:     @config.slice(:url, :command)
    )
    case @transport_type
    when :stdio
      connect_stdio
    when :http, :streamable_http
      connect_http
    else
      raise ArgumentError, "Unknown transport: #{@transport_type}"
    end
    @connected = true
    LoggingSupport.info(
      'client.connect.complete',
      connection: @name,
      transport:  @transport_type
    )
  end
rescue StandardError => e
  @connected = false
  handle_exception(e, level: :error, operation: 'legion.mcp.client.connection.connect')
  raise
end

#connected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/mcp/client/connection.rb', line 25

def connected?
  @connected
end

#disconnect ⇒ Object 



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# File 'lib/legion/mcp/client/connection.rb', line 60

def disconnect
  @mutex.synchronize do
    @transport&.close if @transport.respond_to?(:close)
    @connected = false
    @tools_cache = nil
  end
end

#tools(force_refresh: false) ⇒ Object 



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# File 'lib/legion/mcp/client/connection.rb', line 68

def tools(force_refresh: false)
  @mutex.synchronize do
    if !force_refresh && @tools_cache && @tools_cached_at &&
       (Time.now - @tools_cached_at) < TOOL_CACHE_TTL
      LoggingSupport.info(
        'client.tools.cache_hit',
        connection: @name,
        transport:  @transport_type,
        count:      @tools_cache.size
      )
      return @tools_cache
    end

    LoggingSupport.info(
      'client.tools.fetch.start',
      connection:    @name,
      transport:     @transport_type,
      force_refresh: force_refresh
    )
    @tools_cache = fetch_tools
    @tools_cached_at = Time.now
    LoggingSupport.info(
      'client.tools.fetch.complete',
      connection: @name,
      transport:  @transport_type,
      count:      @tools_cache.size
    )
    @tools_cache
  end
end