Class: Async::WebSocket::Client

Inherits:
Protocol::HTTP::Middleware
  • Object
show all
Includes:
Protocol::WebSocket::Headers
Defined in:
lib/async/websocket/client.rb

Overview

This is a basic synchronous websocket client:

Defined Under Namespace

Classes: ClientCloseDecorator, Framer

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(client, **options) ⇒ Client

Returns a new instance of Client.



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# File 'lib/async/websocket/client.rb', line 69

def initialize(client, **options)
  super(client)
  
  @options = options
end

Class Method Details

.connect(endpoint, *arguments, **options, &block) ⇒ Connection

Returns an open websocket connection to the given endpoint.

Returns:

  • an open websocket connection to the given endpoint.



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# File 'lib/async/websocket/client.rb', line 55

def self.connect(endpoint, *arguments, **options, &block)
  client = self.open(endpoint, *arguments)
  connection = client.connect(endpoint.authority, endpoint.path, **options)
  
  return ClientCloseDecorator.new(client, connection) unless block_given?
  
  begin
    yield connection
  ensure
    connection.close
    client.close
  end
end

.open(endpoint, **options, &block) ⇒ Client

Returns a client which can be used to establish websocket connections to the given endpoint.

Returns:

  • a client which can be used to establish websocket connections to the given endpoint.



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# File 'lib/async/websocket/client.rb', line 26

def self.open(endpoint, **options, &block)
  client = self.new(HTTP::Client.new(endpoint, **options), mask: true)
  
  return client unless block_given?
  
  begin
    yield client
  ensure
    client.close
  end
end

Instance Method Details

#connect(authority, path, headers: nil, handler: Connection, extensions: ::Protocol::WebSocket::Extensions::Client.default, **options, &block) ⇒ Object 



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# File 'lib/async/websocket/client.rb', line 93

def connect(authority, path, headers: nil, handler: Connection, extensions: ::Protocol::WebSocket::Extensions::Client.default, **options, &block)
  headers = ::Protocol::HTTP::Headers[headers]
  
  extensions&.offer do |extension|
    headers.add(SEC_WEBSOCKET_EXTENSIONS, extension.join("; "))
  end
  
  request = Request.new(nil, authority, path, headers, **options)
  
  pool = @delegate.pool
  connection = pool.acquire
  
  response = request.call(connection)
  
  unless response.stream?
    response.close
    
    raise ProtocolError, "Failed to negotiate connection: #{response.status}"
  end
  
  protocol = response.headers[SEC_WEBSOCKET_PROTOCOL]&.first
  stream = response.stream
  
  framer = Framer.new(pool, connection, stream)
  
  connection = nil
  
  if extension_headers = response.headers[SEC_WEBSOCKET_EXTENSIONS]
    extensions.accept(extension_headers)
  end
  
  response = nil
  stream = nil
  
  return handler.call(framer, protocol, extensions, **@options, &block)
ensure
  pool.release(connection) if connection
end