Class: A2A::Transport::Http

Inherits:
Object
  • Object
show all
Defined in:
lib/a2a/transport/http.rb

Constant Summary collapse

DEFAULT_TIMEOUT =

Default configuration values

30
DEFAULT_OPEN_TIMEOUT = 
10
DEFAULT_READ_TIMEOUT = 
30
DEFAULT_WRITE_TIMEOUT = 
30
DEFAULT_POOL_SIZE = 
5
DEFAULT_POOL_TIMEOUT = 
5
DEFAULT_RETRY_COUNT = 
3
DEFAULT_RETRY_DELAY = 
1.0

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(base_url, config = {}) ⇒ Http

Initialize HTTP transport

Parameters:

  • base_url (String) —

    Base URL for the HTTP endpoint

  • config (Hash) (defaults to: {}) —

    Configuration options

Options Hash (config):

  • :timeout (Integer) — default: 30 —

    Request timeout in seconds

  • :open_timeout (Integer) — default: 10 —

    Connection open timeout

  • :read_timeout (Integer) — default: 30 —

    Read timeout

  • :write_timeout (Integer) — default: 30 —

    Write timeout

  • :pool_size (Integer) — default: 5 —

    Connection pool size

  • :pool_timeout (Integer) — default: 5 —

    Pool checkout timeout

  • :retry_count (Integer) — default: 3 —

    Number of retries

  • :retry_delay (Float) — default: 1.0 —

    Delay between retries

  • :ssl_verify (Boolean) — default: true —

    Verify SSL certificates

  • :ssl_ca_file (String) —

    Path to CA certificate file

  • :ssl_ca_path (String) —

    Path to CA certificate directory

  • :headers (Hash) — default: {} —

    Default headers

  • :logging (Boolean) — default: false —

    Enable request/response logging

  • :logger (Logger) —

    Logger instance

  • :proxy (Hash) —

    Proxy configuration



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# File 'lib/a2a/transport/http.rb', line 60

def initialize(base_url, config = {})
  @base_url = base_url
  @config = default_config.merge(config)
  @connection = build_connection
  @metrics = Concurrent::Hash.new(0)
end

Instance Attribute Details

#base_url ⇒ Object (readonly)

Returns the value of attribute base_url.



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# File 'lib/a2a/transport/http.rb', line 37

def base_url
  @base_url
end

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/a2a/transport/http.rb', line 37

def config
  @config
end

#connection ⇒ Object (readonly)

Returns the value of attribute connection.



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# File 'lib/a2a/transport/http.rb', line 37

def connection
  @connection
end

Instance Method Details

#build_connection ⇒ Faraday::Connection (private)

Build Faraday connection with configuration

Returns:

  • (Faraday::Connection) —

    Configured connection



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# File 'lib/a2a/transport/http.rb', line 273

def build_connection
  Faraday.new(@base_url) do |conn|
    # Request/response middleware
    conn.request :json
    conn.request :multipart if MULTIPART_AVAILABLE
    conn.request :url_encoded

    # NOTE: Retry middleware requires faraday-retry gem
    # Uncomment when faraday-retry is available:
    # conn.request :retry,
    #   max: @config[:retry_count],
    #   interval: @config[:retry_delay],
    #   backoff_factor: 2,
    #   retry_statuses: [429, 500, 502, 503, 504],
    #   methods: [:get, :post, :put, :delete]

    # Logging middleware
    conn.response :logger, @config[:logger] || default_logger if @config[:logging]

    # Response middleware
    conn.response :json, content_type: /\bjson$/
    # NOTE: Not using :raise_error to handle errors manually

    # Adapter (use default net_http adapter)
    # Note: net_http_persistent requires separate gem for connection pooling
    conn.adapter Faraday.default_adapter

    # Configure timeouts
    conn.options.timeout = @config[:timeout]
    conn.options.open_timeout = @config[:open_timeout]
    conn.options.read_timeout = @config[:read_timeout]
    conn.options.write_timeout = @config[:write_timeout]

    # Configure SSL
    conn.ssl.verify = @config[:ssl_verify]
    conn.ssl.ca_file = @config[:ssl_ca_file] if @config[:ssl_ca_file]
    conn.ssl.ca_path = @config[:ssl_ca_path] if @config[:ssl_ca_path]

    # Configure proxy
    conn.proxy = @config[:proxy] if @config[:proxy]

    # Set default headers
    conn.headers.update(@config[:headers]) if @config[:headers].any?
  end
end

#close ⇒ Object

Close connection and cleanup resources



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# File 'lib/a2a/transport/http.rb', line 239

def close
  @connection&.close
end

#default_config ⇒ Hash (private)

Build default configuration

Returns:

  • (Hash) —

    Default configuration



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# File 'lib/a2a/transport/http.rb', line 250

def default_config
  {
    timeout: DEFAULT_TIMEOUT,
    open_timeout: DEFAULT_OPEN_TIMEOUT,
    read_timeout: DEFAULT_READ_TIMEOUT,
    write_timeout: DEFAULT_WRITE_TIMEOUT,
    pool_size: DEFAULT_POOL_SIZE,
    pool_timeout: DEFAULT_POOL_TIMEOUT,
    retry_count: DEFAULT_RETRY_COUNT,
    retry_delay: DEFAULT_RETRY_DELAY,
    ssl_verify: true,
    headers: {},
    logging: false,
    logger: nil,
    proxy: nil
  }
end

#default_logger ⇒ Logger (private)

Get default logger

Returns:

  • (Logger) —

    Default logger instance



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# File 'lib/a2a/transport/http.rb', line 405

def default_logger
  logger = Logger.new($stdout)
  logger.level = Logger::INFO
  logger.formatter = proc do |severity, datetime, progname, msg|
    "[#{datetime}] #{severity} -- #{progname}: #{msg}\n"
  end
  logger
end

#delete(path = "", params: {}, headers: {}) ⇒ Faraday::Response

Send DELETE request

Parameters:

  • path (String) (defaults to: "") —

    Request path

  • params (Hash) (defaults to: {}) —

    Query parameters

  • headers (Hash) (defaults to: {}) —

    Request headers

Returns:

  • (Faraday::Response) —

    HTTP response



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# File 'lib/a2a/transport/http.rb', line 194

def delete(path = "", params: {}, headers: {})
  request(:delete, path, params: params, headers: headers)
end

#get(path = "", params: {}, headers: {}) ⇒ Faraday::Response

Send GET request

Parameters:

  • path (String) (defaults to: "") —

    Request path

  • params (Hash) (defaults to: {}) —

    Query parameters

  • headers (Hash) (defaults to: {}) —

    Request headers

Returns:

  • (Faraday::Response) —

    HTTP response



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# File 'lib/a2a/transport/http.rb', line 156

def get(path = "", params: {}, headers: {})
  request(:get, path, params: params, headers: headers)
end

#handle_response(response) ⇒ Faraday::Response (private)

Handle HTTP response

Parameters:

  • response (Faraday::Response) —

    HTTP response

Returns:

  • (Faraday::Response) —

    Validated response

Raises:



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# File 'lib/a2a/transport/http.rb', line 343

def handle_response(response)
  case response.status
  when 200..299
    response
  when 400..499
    raise A2A::Errors::HTTPError.new(
      "Client error: #{response.status}",
      status_code: response.status,
      response_body: response.body
    )
  when 500..599
    raise A2A::Errors::HTTPError.new(
      "Server error: #{response.status}",
      status_code: response.status,
      response_body: response.body
    )
  else
    raise A2A::Errors::HTTPError.new(
      "Unexpected status: #{response.status}",
      status_code: response.status,
      response_body: response.body
    )
  end
end

#json_rpc_request(rpc_request, headers: {}) ⇒ Hash

Send JSON-RPC request

Parameters:

  • rpc_request (Hash) —

    JSON-RPC request object

  • headers (Hash) (defaults to: {}) —

    Additional headers

Returns:

  • (Hash) —

    JSON-RPC response

Raises:



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# File 'lib/a2a/transport/http.rb', line 206

def json_rpc_request(rpc_request, headers: {})
  default_headers = {
    "Content-Type" => "application/json",
    "Accept" => "application/json"
  }

  response = post(
    body: rpc_request.to_json,
    headers: default_headers.merge(headers)
  )

  parse_json_response(response)
end

#metrics ⇒ Hash

Get connection metrics

Returns:

  • (Hash) —

    Metrics data



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# File 'lib/a2a/transport/http.rb', line 225

def metrics
  @metrics.to_h
end

#parse_json_response(response) ⇒ Hash (private)

Parse JSON response

Parameters:

  • response (Faraday::Response) —

    HTTP response

Returns:

  • (Hash) —

    Parsed JSON data

Raises:



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# File 'lib/a2a/transport/http.rb', line 375

def parse_json_response(response)
  return response.body if response.body.is_a?(Hash)

  JSON.parse(response.body)
rescue JSON::ParserError => e
  raise A2A::Errors::JSONError, "Invalid JSON response: #{e.message}"
end

#post(path = "", body: nil, params: {}, headers: {}) ⇒ Faraday::Response

Send POST request

Parameters:

  • path (String) (defaults to: "") —

    Request path

  • body (String, Hash) (defaults to: nil) —

    Request body

  • params (Hash) (defaults to: {}) —

    Query parameters

  • headers (Hash) (defaults to: {}) —

    Request headers

Returns:

  • (Faraday::Response) —

    HTTP response



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# File 'lib/a2a/transport/http.rb', line 169

def post(path = "", body: nil, params: {}, headers: {})
  request(:post, path, params: params, headers: headers, body: body)
end

#prepare_body(body) ⇒ String (private)

Prepare request body

Parameters:

  • body (String, Hash, Object) —

    Request body

Returns:

  • (String) —

    Prepared body



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# File 'lib/a2a/transport/http.rb', line 325

def prepare_body(body)
  case body
  when String
    body
  when Hash, Array
    body.to_json
  else
    body.respond_to?(:to_json) ? body.to_json : body.to_s
  end
end

#put(path = "", body: nil, params: {}, headers: {}) ⇒ Faraday::Response

Send PUT request

Parameters:

  • path (String) (defaults to: "") —

    Request path

  • body (String, Hash) (defaults to: nil) —

    Request body

  • params (Hash) (defaults to: {}) —

    Query parameters

  • headers (Hash) (defaults to: {}) —

    Request headers

Returns:

  • (Faraday::Response) —

    HTTP response



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# File 'lib/a2a/transport/http.rb', line 182

def put(path = "", body: nil, params: {}, headers: {})
  request(:put, path, params: params, headers: headers, body: body)
end

#record_metrics(method, status, duration) ⇒ Object (private)

Record request metrics

Parameters:

  • method (Symbol) —

    HTTP method

  • status (Integer, Symbol) —

    Response status or error type

  • duration (Float) —

    Request duration in seconds



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# File 'lib/a2a/transport/http.rb', line 390

def record_metrics(method, status, duration)
  @metrics["#{method}_requests"] += 1
  @metrics["#{method}_#{status}"] += 1
  @metrics["total_requests"] += 1
  @metrics["total_duration"] += duration

  # Track average duration
  @metrics["average_duration"] = @metrics["total_duration"] / @metrics["total_requests"]
end

#request(method, path = "", params: {}, headers: {}, body: nil) ⇒ Faraday::Response

Send HTTP request

Parameters:

  • method (Symbol) —

    HTTP method (:get, :post, :put, :delete, etc.)

  • path (String) (defaults to: "") —

    Request path

  • params (Hash) (defaults to: {}) —

    Request parameters

  • headers (Hash) (defaults to: {}) —

    Request headers

  • body (String, Hash) (defaults to: nil) —

    Request body

Returns:

  • (Faraday::Response) —

    HTTP response

Raises:



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# File 'lib/a2a/transport/http.rb', line 80

def request(method, path = "", params: {}, headers: {}, body: nil)
  start_time = Time.now

  begin
    response = @connection.public_send(method, path) do |req|
      req.params.update(params) if params.any?
      req.headers.update(headers) if headers.any?
      req.body = prepare_body(body) if body
    end

    record_metrics(method, response.status, Time.now - start_time)
    handle_response(response)
    response
  rescue A2A::Errors::HTTPError => e
    # Re-raise A2A HTTP errors (from handle_response)
    record_metrics(method, e.status_code || :http_error, Time.now - start_time)
    raise e
  rescue Faraday::TimeoutError => e
    record_metrics(method, :timeout, Time.now - start_time)
    raise A2A::Errors::TimeoutError, "Request timeout: #{e.message}"
  rescue Faraday::ConnectionFailed => e
    record_metrics(method, :connection_failed, Time.now - start_time)
    # Check if it's a timeout-like error
    if e.message.include?("timeout") || e.message.include?("execution expired")
      raise A2A::Errors::TimeoutError, "Request timeout: #{e.message}"
    end

    raise A2A::Errors::TransportError, "Connection failed: #{e.message}"
  rescue Faraday::SSLError => e
    record_metrics(method, :ssl_error, Time.now - start_time)
    raise A2A::Errors::TransportError, "SSL error: #{e.message}"
  rescue Faraday::ClientError => e
    record_metrics(method, :client_error, Time.now - start_time)
    # Handle HTTP status errors from Faraday
    raise A2A::Errors::TransportError, "Client error: #{e.message}" unless e.response && e.response[:status]

    status = e.response[:status]
    case status
    when 400..499
      raise A2A::Errors::HTTPError.new(
        "Client error: #{status}",
        status_code: status,
        response_body: e.response[:body]
      )
    when 500..599
      raise A2A::Errors::HTTPError.new(
        "Server error: #{status}",
        status_code: status,
        response_body: e.response[:body]
      )
    else
      raise A2A::Errors::HTTPError.new(
        "HTTP error: #{status}",
        status_code: status,
        response_body: e.response[:body]
      )
    end
  rescue StandardError => e
    record_metrics(method, :error, Time.now - start_time)
    # Check if it's a timeout-like error
    if e.message.include?("timeout") || e.message.include?("execution expired")
      raise A2A::Errors::TimeoutError, "Request timeout: #{e.message}"
    end

    raise A2A::Errors::TransportError, "Transport error: #{e.message}"
  end
end

#reset_metrics! ⇒ Object

Reset connection metrics



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# File 'lib/a2a/transport/http.rb', line 232

def reset_metrics!
  @metrics.clear
end