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# ``twisted`.`internet`.`protocol`.`Protocol``

class documentation

`class Protocol(BaseProtocol): (source)`

Known subclasses: `twisted.conch.client.agent.SSHAgentForwardingLocal`, `twisted.conch.insults.helper.TerminalBuffer`, `twisted.conch.insults.insults.ClientProtocol`, `twisted.conch.insults.insults.ServerProtocol`, `twisted.conch.ssh.agent.SSHAgentClient`, `twisted.conch.ssh.agent.SSHAgentServer`, `twisted.conch.ssh.filetransfer.FileTransferBase`, `twisted.conch.ssh.forwarding.SSHForwardingClient`, `twisted.conch.ssh.session.SSHSessionClient`, `twisted.conch.ssh.transport.SSHTransportBase`, `twisted.conch.telnet.Telnet`, `twisted.conch.telnet.TelnetProtocol`, `twisted.internet.testing.AccumulatingProtocol`, `twisted.names.dns.DNSProtocol`, `twisted.protocols.basic.IntNStringReceiver`, `twisted.protocols.basic.LineOnlyReceiver`, `twisted.protocols.basic.LineReceiver`, `twisted.protocols.basic.NetstringReceiver`, `twisted.protocols.ftp.DTP`, `twisted.protocols.ftp.ProtocolWrapper`, `twisted.protocols.ftp.SenderProtocol`, `twisted.protocols.policies.ProtocolWrapper`, `twisted.protocols.portforward.Proxy`, `twisted.protocols.socks.SOCKSv4`, `twisted.protocols.socks.SOCKSv4Incoming`, `twisted.protocols.socks.SOCKSv4Outgoing`, `twisted.protocols.stateful.StatefulProtocol`, `twisted.protocols.wire.Chargen`, `twisted.protocols.wire.Daytime`, `twisted.protocols.wire.Discard`, `twisted.protocols.wire.Echo`, `twisted.protocols.wire.QOTD`, `twisted.protocols.wire.Time`, `twisted.protocols.wire.Who`, `twisted.runner.inetd.InetdProtocol`, `twisted.spread.banana.Banana`, `twisted.web._http2.H2Connection`, `twisted.web._newclient.HTTP11ClientProtocol`, `twisted.web.sux.XMLParser`, `twisted.words.protocols.irc.DccFileReceiveBasic`, `twisted.words.protocols.irc.DccSendProtocol`, `twisted.words.protocols.irc.IRC`, `twisted.words.xish.xmlstream.XmlStream`, `twisted.internet.endpoints._WrappingProtocol`, `twisted.web.client._ReadBodyProtocol`

Implements interfaces: `twisted.internet.interfaces.ILoggingContext`, `twisted.internet.interfaces.IProtocol`

View In Hierarchy

This is the base class for streaming connection-oriented protocols.

If you are going to write a new connection-oriented protocol for Twisted, start here. Any protocol implementation, either client or server, should be a subclass of this class.

The API is quite simple. Implement `dataReceived` to handle both event-based and synchronous input; output can be sent through the 'transport' attribute, which is to be an instance that implements `twisted.internet.interfaces.ITransport`. Override `connectionLost` to be notified when the connection ends.

Some subclasses exist already to help you write common types of protocols: see the `twisted.protocols.basic` module for a few of them.

Method | `connectionLost` | Called when the connection is shut down.
Method | `dataReceived` | Called whenever data is received.
Method | `logPrefix` | Return a prefix matching the class name, to identify log messages related to this protocol instance.
Class Variable | `factory` | Undocumented

Inherited from `BaseProtocol`:

Method | `connectionMade` | Called when a connection is made.
Method | `makeConnection` | Make a connection to a transport and a server.
Instance Variable | `connected` | Undocumented
Instance Variable | `transport` | Undocumented

def connectionLost(self, reason=connectionDone): (source)
from `twisted.internet.interfaces.IProtocol`
overridden in `twisted.conch.insults.insults.ClientProtocol`, `twisted.conch.insults.insults.ServerProtocol`, `twisted.conch.ssh.filetransfer.FileTransferBase`, `twisted.conch.ssh.forwarding.SSHForwardingClient`, `twisted.conch.ssh.transport.SSHTransportBase`, `twisted.conch.telnet.StatefulTelnetProtocol`, `twisted.conch.telnet.StatefulTelnetProtocol`, `twisted.conch.telnet.Telnet`, `twisted.conch.telnet.TelnetBootstrapProtocol`, `twisted.internet.testing.AccumulatingProtocol`, `twisted.internet.testing.LineSendingProtocol`, `twisted.mail.imap4.IMAP4Client`, `twisted.mail.imap4.IMAP4Server`, `twisted.mail.pop3.AdvancedPOP3Client`, `twisted.mail.pop3.POP3`, `twisted.mail.smtp.SMTP`, `twisted.mail.smtp.SMTPClient`, `twisted.names.dns.DNSProtocol`, `twisted.protocols.amp.BinaryBoxProtocol`, `twisted.protocols.ftp.DTP`, `twisted.protocols.ftp.FTP`, `twisted.protocols.ftp.FTPClientBasic`, `twisted.protocols.ftp.ProtocolWrapper`, `twisted.protocols.ftp.SenderProtocol`, `twisted.protocols.ident.IdentClient`, `twisted.protocols.memcache.MemCacheProtocol`, `twisted.protocols.policies.ProtocolWrapper`, `twisted.protocols.portforward.Proxy`, `twisted.protocols.socks.SOCKSv4`, `twisted.protocols.socks.SOCKSv4Incoming`, `twisted.protocols.socks.SOCKSv4Outgoing`, `twisted.spread.pb.Broker`, `twisted.web._http2.H2Connection`, `twisted.web._newclient.HTTP11ClientProtocol`, `twisted.web._newclient.HTTPClientParser`, `twisted.web.http.HTTPChannel`, `twisted.web.http.HTTPClient`, `twisted.web.sux.XMLParser`, `twisted.words.protocols.irc.DccFileReceive`, `twisted.words.protocols.irc.DccSendProtocol`, `twisted.words.protocols.irc.IRCClient`, `twisted.words.service.IRCUser`, `twisted.words.xish.xmlstream.XmlStream`, `twisted.internet.endpoints._WrappingProtocol`, `twisted.web.client._ReadBodyProtocol`

Called when the connection is shut down.

Clear any circular references here, and any external references to this Protocol. The connection has been closed.

Parameters
reason:`twisted.python.failure.Failure` | Undocumented

def dataReceived(self, data): (source)
from `twisted.internet.interfaces.IProtocol`
overridden in `twisted.conch.insults.insults.ClientProtocol`, `twisted.conch.insults.insults.ServerProtocol`, `twisted.conch.ssh.agent.SSHAgentClient`, `twisted.conch.ssh.agent.SSHAgentServer`, `twisted.conch.ssh.filetransfer.FileTransferBase`, `twisted.conch.ssh.forwarding.SSHForwardingClient`, `twisted.conch.ssh.session.SSHSessionClient`, `twisted.conch.ssh.transport.SSHTransportBase`, `twisted.conch.telnet.Telnet`, `twisted.conch.telnet.TelnetBootstrapProtocol`, `twisted.internet.testing.AccumulatingProtocol`, `twisted.names.dns.DNSProtocol`, `twisted.protocols.basic.IntNStringReceiver`, `twisted.protocols.basic.LineOnlyReceiver`, `twisted.protocols.basic.LineReceiver`, `twisted.protocols.basic.NetstringReceiver`, `twisted.protocols.ftp.DTP`, `twisted.protocols.ftp.ProtocolWrapper`, `twisted.protocols.ftp.SenderProtocol`, `twisted.protocols.policies.ProtocolWrapper`, `twisted.protocols.portforward.Proxy`, `twisted.protocols.socks.SOCKSv4`, `twisted.protocols.socks.SOCKSv4Incoming`, `twisted.protocols.socks.SOCKSv4Outgoing`, `twisted.protocols.stateful.StatefulProtocol`, `twisted.protocols.wire.Discard`, `twisted.protocols.wire.Echo`, `twisted.spread.banana.Banana`, `twisted.web._http2.H2Connection`, `twisted.web._newclient.HTTP11ClientProtocol`, `twisted.web.sux.XMLParser`, `twisted.words.protocols.irc.DccFileReceiveBasic`, `twisted.words.protocols.irc.DccSendProtocol`, `twisted.words.protocols.irc.IRC`, `twisted.words.xish.xmlstream.XmlStream`, `twisted.internet.endpoints._WrappingProtocol`, `twisted.web.client._ReadBodyProtocol`

Called whenever data is received.

Use this method to translate to a higher-level message. Usually, some callback will be made upon the receipt of each complete protocol message.

Parameters
data:`bytes` | a string of indeterminate length. Please keep in mind that you will probably need to buffer some data, as partial (or multiple) protocol messages may be received! I recommend that unit tests for protocols call through to this method with differing chunk sizes, down to one byte at a time.

def logPrefix(self): (source)
from `twisted.internet.interfaces.ILoggingContext`
overridden in `twisted.protocols.policies.ProtocolWrapper`, `twisted.internet.endpoints._WrappingProtocol`

Return a prefix matching the class name, to identify log messages related to this protocol instance.

factory: `Optional[Factory]` = (source)
overridden in `twisted.conch.client.direct.SSHClientTransport`, `twisted.conch.insults.insults.ClientProtocol`, `twisted.conch.insults.insults.ServerProtocol`, `twisted.internet.testing.AccumulatingProtocol`, `twisted.mail.pop3.POP3`, `twisted.mail.relaymanager.SMTPManagedRelayer`, `twisted.protocols.dict.DictClient`, `twisted.protocols.policies.ProtocolWrapper`, `twisted.spread.pb.Broker`, `twisted.web._http2.H2Connection`

Undocumented