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# Copyright (c) 2021 Ultimaker B.V.
# libCharon is released under the terms of the LGPLv3 or higher.
import socket
import struct
from io import BytesIO, SEEK_SET, SEEK_CUR
from typing import Any, Dict, IO, Optional, List
from Charon.filetypes.GCodeFile import GCodeFile
from urllib.parse import urlparse
## This class is used to read GCode stream that are served
# dynamically over a TCP connection.
class SocketFileStream(BytesIO):
def __init__(self, sock_object: socket.socket) -> None:
super().__init__()
self.current_line = 0
self.__socket = sock_object
def seekable(self) -> bool:
return True
def seek(self, offset: int, whence: Optional[int] = None) -> int:
if whence is None or whence == SEEK_SET:
self.current_line = offset
elif whence == SEEK_CUR:
self.current_line += offset
else:
raise ValueError('Unsupported whence mode in seek: %d' % whence)
return offset
def readline(self, _size: int = -1) -> bytes:
self.__socket.send(struct.pack('>I', self.current_line))
line = b''
char = b''
while char != b'\n':
char = self.__socket.recv(1)
line += char
self.current_line += 1
return line
def read(self, _size: int = -1) -> bytes:
raise NotImplementedError("Only readline has been implemented")
def readlines(self, _hint: int = -1) -> List[bytes]:
raise NotImplementedError("Only readline has been implemented")
def tell(self) -> int:
raise NotImplementedError("Only readline has been implemented")
def close(self) -> None:
self.__socket.close()
def __iter__(self):
return self
def __next__(self):
return self.readline()
class GCodeSocket(GCodeFile):
mime_type = "text/x-gcode-socket"
MaximumHeaderLength = 100
def __init__(self) -> None:
super().__init__()
self.__stream = None # type: Optional[IO[bytes]]
self.__metadata = {} # type: Dict[str, Any]
self.__sock = None
@staticmethod
def stream_handler(path: str, mode: str) -> IO:
url = urlparse(path)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((url.hostname, 1337))
return SocketFileStream(sock)
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