79 lines
3.5 KiB
Python
79 lines
3.5 KiB
Python
"""A 'socket' compatible interface thru the ESP SPI 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.get_host_by_name(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._socknum = _the_interface.get_socket()
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def connect(self, address, conntype=None):
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"""Connect the socket to the 'address' (which can be 32bit packed IP or
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a hostname string). 'conntype' is an extra that may indicate SSL or not,
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depending on the underlying interface"""
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host, port = address
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if not _the_interface.socket_connect(self._socknum, host, port, conn_mode=conntype):
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raise RuntimeError("Failed to connect to host", host)
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self._buffer = b''
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def write(self, data): # pylint: disable=no-self-use
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"""Send some data to the socket"""
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_the_interface.socket_write(self._socknum, 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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while 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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avail = _the_interface.socket_available(self._socknum)
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if avail:
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self._buffer += _the_interface.socket_read(self._socknum, avail)
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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 read(self, size=0):
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"""Read up to 'size' bytes from the socket, this may be buffered internally!
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If 'size' isnt specified, return everything in the buffer."""
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avail = _the_interface.socket_available(self._socknum)
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if avail:
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self._buffer += _the_interface.socket_read(self._socknum, avail)
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if size == 0: # read as much as we can at the moment
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ret = self._buffer
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self._buffer = b''
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return ret
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while len(self._buffer) < size:
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avail = _the_interface.socket_available(self._socknum)
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if avail:
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self._buffer += _the_interface.socket_read(self._socknum, avail)
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ret = self._buffer[:size]
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self._buffer = self._buffer[size:]
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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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_the_interface.socket_close(self._socknum)
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# pylint: enable=unused-argument, redefined-builtin, invalid-name
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