90 lines
3.3 KiB
Python
90 lines
3.3 KiB
Python
"""A 'socket' compatible interface thru the ESP AT command set"""
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from micropython import const
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_the_interface = None # pylint: disable=invalid-name
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def set_interface(iface):
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"""Helper to set the global internet interface"""
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global _the_interface # pylint: disable=global-statement, invalid-name
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_the_interface = iface
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SOCK_STREAM = const(1)
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AF_INET = const(2)
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# pylint: disable=too-many-arguments, unused-argument
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def getaddrinfo(host, port, family=0, socktype=0, proto=0, flags=0):
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"""Given a hostname and a port name, return a 'socket.getaddrinfo'
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compatible list of tuples. Honestly, we ignore anything but host & port"""
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if not isinstance(port, int):
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raise RuntimeError("port must be an integer")
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ipaddr = _the_interface.nslookup(host)
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return [(AF_INET, socktype, proto, "", (ipaddr, port))]
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# pylint: enable=too-many-arguments, unused-argument
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# pylint: disable=unused-argument, redefined-builtin, invalid-name
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class socket:
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"""A simplified implementation of the Python 'socket' class, for connecting
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through an interface to a remote device"""
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def __init__(self, family=AF_INET, type=SOCK_STREAM, proto=0, fileno=None):
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if family != AF_INET:
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raise RuntimeError("Only AF_INET family supported")
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if type != SOCK_STREAM:
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raise RuntimeError("Only SOCK_STREAM type supported")
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self._buffer = b""
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self.settimeout(0)
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def connect(self, address, conntype=None):
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"""Connect the socket to the 'address' (which should be dotted quad IP). 'conntype'
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is an extra that may indicate SSL or not, depending on the underlying interface"""
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host, port = address
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if not _the_interface.socket_connect(
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conntype, host, port, keepalive=10, retries=3
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):
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raise RuntimeError("Failed to connect to host", host)
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self._buffer = b""
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def send(self, data): # pylint: disable=no-self-use
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"""Send some data to the socket"""
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_the_interface.socket_send(data)
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def readline(self):
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"""Attempt to return as many bytes as we can up to but not including '\r\n'"""
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if b"\r\n" not in self._buffer:
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# there's no line already in there, read some more
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self._buffer = self._buffer + _the_interface.socket_receive(timeout=3)
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# print(self._buffer)
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firstline, self._buffer = self._buffer.split(b"\r\n", 1)
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return firstline
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def recv(self, num=0):
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"""Read up to 'num' bytes from the socket, this may be buffered internally!
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If 'num' isnt specified, return everything in the buffer."""
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if num == 0:
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# read as much as we can
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ret = self._buffer + _the_interface.socket_receive(timeout=self._timeout)
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self._buffer = b""
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else:
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ret = self._buffer[:num]
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self._buffer = self._buffer[num:]
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return ret
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def close(self):
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"""Close the socket, after reading whatever remains"""
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# read whatever's left
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self._buffer = self._buffer + _the_interface.socket_receive(
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timeout=self._timeout
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)
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_the_interface.socket_disconnect()
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def settimeout(self, value):
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"""Set the read timeout for sockets, if value is 0 it will block"""
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self._timeout = value
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# pylint: enable=unused-argument, redefined-builtin, invalid-name
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