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//usr/local/lib/python3.9/test/mock_socket.py

"""Mock socket module used by the smtpd and smtplib tests.
"""

# imported for _GLOBAL_DEFAULT_TIMEOUT
import socket as socket_module

# Mock socket module
_defaulttimeout = None
_reply_data = None

# This is used to queue up data to be read through socket.makefile, typically
# *before* the socket object is even created. It is intended to handle a single
# line which the socket will feed on recv() or makefile().
def reply_with(line):
    global _reply_data
    _reply_data = line

class MockFile:
    """Mock file object returned by MockSocket.makefile().
    """
    def __init__(self, lines):
        self.lines = lines
    def readline(self, limit=-1):
        result = self.lines.pop(0) + b'\r\n'
        if limit >= 0:
            # Re-insert the line, removing the \r\n we added.
            self.lines.insert(0, result[limit:-2])
            result = result[:limit]
        return result
    def close(self):
        pass

class MockSocket:
    """Mock socket object used by smtpd and smtplib tests.
    """
    def __init__(self, family=None):
        global _reply_data
        self.family = family
        self.output = []
        self.lines = []
        if _reply_data:
            self.lines.append(_reply_data)
            _reply_data = None
        self.conn = None
        self.timeout = None

def queue_recv(self, line):
        self.lines.append(line)

def recv(self, bufsize, flags=None):
        data = self.lines.pop(0) + b'\r\n'
        return data

def fileno(self):
        return 0

def settimeout(self, timeout):
        if timeout is None:
            self.timeout = _defaulttimeout
        else:
            self.timeout = timeout

def gettimeout(self):
        return self.timeout

def setsockopt(self, level, optname, value):
        pass

def getsockopt(self, level, optname, buflen=None):
        return 0

def bind(self, address):
        pass

def accept(self):
        self.conn = MockSocket()
        return self.conn, 'c'

def getsockname(self):
        return ('0.0.0.0', 0)

def setblocking(self, flag):
        pass

def listen(self, backlog):
        pass

def makefile(self, mode='r', bufsize=-1):
        handle = MockFile(self.lines)
        return handle

def sendall(self, data, flags=None):
        self.last = data
        self.output.append(data)
        return len(data)

def send(self, data, flags=None):
        self.last = data
        self.output.append(data)
        return len(data)

def getpeername(self):
        return ('peer-address', 'peer-port')

def close(self):
        pass

def connect(self, host):
        pass

def socket(family=None, type=None, proto=None):
    return MockSocket(family)

def create_connection(address, timeout=socket_module._GLOBAL_DEFAULT_TIMEOUT,
                      source_address=None):
    try:
        int_port = int(address[1])
    except ValueError:
        raise error
    ms = MockSocket()
    if timeout is socket_module._GLOBAL_DEFAULT_TIMEOUT:
        timeout = getdefaulttimeout()
    ms.settimeout(timeout)
    return ms

def setdefaulttimeout(timeout):
    global _defaulttimeout
    _defaulttimeout = timeout

def getdefaulttimeout():
    return _defaulttimeout

def getfqdn():
    return ""

def gethostname():
    pass

def gethostbyname(name):
    return ""

def getaddrinfo(*args, **kw):
    return socket_module.getaddrinfo(*args, **kw)

gaierror = socket_module.gaierror
error = socket_module.error

# Constants
_GLOBAL_DEFAULT_TIMEOUT = socket_module._GLOBAL_DEFAULT_TIMEOUT
AF_INET = socket_module.AF_INET
AF_INET6 = socket_module.AF_INET6
SOCK_STREAM = socket_module.SOCK_STREAM
SOL_SOCKET = None
SO_REUSEADDR = None

if hasattr(socket_module, 'AF_UNIX'):
    AF_UNIX = socket_module.AF_UNIX