eric: comparison DebugClients/Python/AsyncFile.py

-:8c48f5e0cd92
+:878ce843ca9f
+# -*- coding: utf-8 -*-
+# Copyright (c) 2009 - 2016 Detlev Offenbach <detlev@die-offenbachs.de>
+#
+"""
+Module implementing an asynchronous file like socket interface for the
+debugger.
+"""
+import socket
+from DebugUtilities import prepareJsonCommand
+def AsyncPendingWrite(file):
+"""
+Module function to check for data to be written.
+@param file The file object to be checked (file)
+@return Flag indicating if there is data wating (int)
+"""
+try:
+pending = file.pendingWrite()
+except Exception:
+pending = 0
+return pending
+class AsyncFile(object):
+"""
+Class wrapping a socket object with a file interface.
+"""
+maxtries = 10
+maxbuffersize = 1024 * 1024 * 4
+def __init__(self, sock, mode, name):
+"""
+Constructor
+@param sock the socket object being wrapped
+@param mode mode of this file (string)
+@param name name of this file (string)
+"""
+# Initialise the attributes.
+self.closed = False
+self.sock = sock
+self.mode = mode
+self.name = name
+self.nWriteErrors = 0
+self.encoding = "utf-8"
+self.wpending = ''
+def __checkMode(self, mode):
+"""
+Private method to check the mode.
+This method checks, if an operation is permitted according to
+the mode of the file. If it is not, an IOError is raised.
+@param mode the mode to be checked (string)
+@exception IOError raised to indicate a bad file descriptor
+"""
+if mode != self.mode:
+raise IOError((9, '[Errno 9] Bad file descriptor'))
+def __nWrite(self, n):
+"""
+Private method to write a specific number of pending bytes.
+@param n the number of bytes to be written (int)
+"""
+if n:
+try:
+buf = self.wpending[:n]
+try:
+buf = buf.encode('utf-8', 'backslashreplace')
+except (UnicodeEncodeError, UnicodeDecodeError):
+pass
+self.sock.sendall(buf)
+self.wpending = self.wpending[n:]
+self.nWriteErrors = 0
+except socket.error:
+self.nWriteErrors += 1
+if self.nWriteErrors > self.maxtries:
+self.wpending = ''  # delete all output
+def pendingWrite(self):
+"""
+Public method that returns the number of bytes waiting to be written.
+@return the number of bytes to be written (int)
+"""
+return self.wpending.rfind('\n') + 1
+def close(self, closeit=False):
+"""
+Public method to close the file.
+@param closeit flag to indicate a close ordered by the debugger code
+(boolean)
+"""
+if closeit and not self.closed:
+self.flush()
+self.sock.close()
+self.closed = True
+def flush(self):
+"""
+Public method to write all pending bytes.
+"""
+self.__nWrite(len(self.wpending))
+def isatty(self):
+"""
+Public method to indicate whether a tty interface is supported.
+@return always false
+"""
+return False
+def fileno(self):
+"""
+Public method returning the file number.
+@return file number (int)
+"""
+try:
+return self.sock.fileno()
+except socket.error:
+return -1
+def readable(self):
+"""
+Public method to check, if the stream is readable.
+@return flag indicating a readable stream (boolean)
+"""
+return self.mode == "r"
+def read_p(self, size=-1):
+"""
+Public method to read bytes from this file.
+@param size maximum number of bytes to be read (int)
+@return the bytes read (any)
+"""
+self.__checkMode('r')
+if size < 0:
+size = 20000
+return self.sock.recv(size).decode('utf8', 'backslashreplace')
+def read(self, size=-1):
+"""
+Public method to read bytes from this file.
+@param size maximum number of bytes to be read (int)
+@return the bytes read (any)
+"""
+self.__checkMode('r')
+buf = input()
+if size >= 0:
+buf = buf[:size]
+return buf
+def readline_p(self, size=-1):
+"""
+Public method to read a line from this file.
+<b>Note</b>: This method will not block and may return
+only a part of a line if that is all that is available.
+@param size maximum number of bytes to be read (int)
+@return one line of text up to size bytes (string)
+"""
+self.__checkMode('r')
+if size < 0:
+size = 20000
+# The integration of the debugger client event loop and the connection
+# to the debugger relies on the two lines of the debugger command being
+# delivered as two separate events.  Therefore we make sure we only
+# read a line at a time.
+line = self.sock.recv(size, socket.MSG_PEEK)
+eol = line.find(b'\n')
+if eol >= 0:
+size = eol + 1
+else:
+size = len(line)
+# Now we know how big the line is, read it for real.
+return self.sock.recv(size).decode('utf8', 'backslashreplace')
+def readlines(self, sizehint=-1):
+"""
+Public method to read all lines from this file.
+@param sizehint hint of the numbers of bytes to be read (int)
+@return list of lines read (list of strings)
+"""
+self.__checkMode('r')
+lines = []
+room = sizehint
+line = self.readline_p(room)
+linelen = len(line)
+while linelen > 0:
+lines.append(line)
+if sizehint >= 0:
+room = room - linelen
+if room <= 0:
+break
+line = self.readline_p(room)
+linelen = len(line)
+return lines
+def readline(self, sizehint=-1):
+"""
+Public method to read one line from this file.
+@param sizehint hint of the numbers of bytes to be read (int)
+@return one line read (string)
+"""
+self.__checkMode('r')
+line = input() + '\n'
+if sizehint >= 0:
+line = line[:sizehint]
+return line
+def seekable(self):
+"""
+Public method to check, if the stream is seekable.
+@return flag indicating a seekable stream (boolean)
+"""
+return False
+def seek(self, offset, whence=0):
+"""
+Public method to move the filepointer.
+@param offset offset to move the filepointer to (integer)
+@param whence position the offset relates to
+@exception IOError This method is not supported and always raises an
+IOError.
+"""
+raise IOError((29, '[Errno 29] Illegal seek'))
+def tell(self):
+"""
+Public method to get the filepointer position.
+@exception IOError This method is not supported and always raises an
+IOError.
+"""
+raise IOError((29, '[Errno 29] Illegal seek'))
+def truncate(self, size=-1):
+"""
+Public method to truncate the file.
+@param size size to truncate to (integer)
+@exception IOError This method is not supported and always raises an
+IOError.
+"""
+raise IOError((29, '[Errno 29] Illegal seek'))
+def writable(self):
+"""
+Public method to check, if a stream is writable.
+@return flag indicating a writable stream (boolean)
+"""
+return self.mode == "w"
+def write(self, s):
+"""
+Public method to write a string to the file.
+@param s text to be written (string)
+"""
+self.__checkMode('w')
+cmd = prepareJsonCommand("ClientOutput", {
+"text": s,
+})
+self.write_p(cmd)
+def write_p(self, s):
+"""
+Public method to write a string to the file.
+@param s text to be written (string)
+@exception socket.error raised to indicate too many send attempts
+"""
+self.__checkMode('w')
+tries = 0
+if not self.wpending:
+self.wpending = s
+elif len(self.wpending) + len(s) > self.maxbuffersize:
+# flush wpending if it is too big
+while self.wpending:
+# if we have a persistent error in sending the data, an
+# exception will be raised in __nWrite
+self.flush()
+tries += 1
+if tries > self.maxtries:
+raise socket.error("Too many attempts to send data")
+self.wpending = s
+else:
+self.wpending += s
+self.__nWrite(self.pendingWrite())
+def writelines(self, lines):
+"""
+Public method to write a list of strings to the file.
+@param lines list of texts to be written (list of string)
+"""
+self.write("".join(lines))
+#
+# eflag: noqa = M702

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comparison: DebugClients/Python/AsyncFile.py

DebugClients/Python/AsyncFile.py