DebugClients/Python3/AsyncFile.py

Tue, 02 Oct 2012 19:53:31 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Tue, 02 Oct 2012 19:53:31 +0200
changeset 2087
795992a5c561
parent 1509
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child 2302
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permissions
-rw-r--r--

Made the sixth set of Qt5 compatibility changes.

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2009 - 2012 Detlev Offenbach <detlev@die-offenbachs.de>
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4 #
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5
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6 """
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7 Module implementing an asynchronous file like socket interface for the debugger.
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8 """
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9
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10 import socket
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11
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12 from DebugProtocol import EOT
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14
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15 def AsyncPendingWrite(file):
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16 """
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17 Module function to check for data to be written.
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18
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19 @param file The file object to be checked (file)
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20 @return Flag indicating if there is data wating (int)
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21 """
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22 try:
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23 pending = file.pendingWrite()
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24 except:
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25 pending = 0
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26
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27 return pending
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28
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29
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30 class AsyncFile(object):
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31 """
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32 Class wrapping a socket object with a file interface.
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33 """
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34 maxtries = 10
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35 maxbuffersize = 1024 * 1024 * 4
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36
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37 def __init__(self, sock, mode, name):
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38 """
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39 Constructor
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40
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41 @param sock the socket object being wrapped
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42 @param mode mode of this file (string)
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43 @param name name of this file (string)
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44 """
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45 # Initialise the attributes.
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46 self.closed = False
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47 self.sock = sock
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48 self.mode = mode
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49 self.name = name
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50 self.nWriteErrors = 0
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51
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52 self.encoding = "utf-8"
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53 self.line_buffering = True
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54 self.errors = None
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55
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56 self.wpending = ''
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57
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58 def __checkMode(self, mode):
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59 """
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60 Private method to check the mode.
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61
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62 This method checks, if an operation is permitted according to
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63 the mode of the file. If it is not, an IOError is raised.
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64
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65 @param mode the mode to be checked (string)
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66 """
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67 if mode != self.mode:
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68 raise IOError((9, '[Errno 9] Bad file descriptor'))
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69
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70 def __nWrite(self, n):
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71 """
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72 Private method to write a specific number of pending bytes.
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73
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74 @param n the number of bytes to be written (int)
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75 """
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76 if n:
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77 try:
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78 buf = "{0!s}{1!s}".format(self.wpending[:n], EOT)
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79 try:
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80 buf = buf.encode('utf8', 'backslashreplace')
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81 except (UnicodeEncodeError, UnicodeDecodeError):
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82 pass
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83 self.sock.sendall(buf)
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84 self.wpending = self.wpending[n:]
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85 self.nWriteErrors = 0
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86 except socket.error:
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87 self.nWriteErrors += 1
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88 if self.nWriteErrors > self.maxtries:
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89 self.wpending = '' # delete all output
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90
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91 def pendingWrite(self):
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92 """
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93 Public method that returns the number of bytes waiting to be written.
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94
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95 @return the number of bytes to be written (int)
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96 """
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97 return self.wpending.rfind('\n') + 1
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98
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99 def close(self, closeit=False):
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100 """
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101 Public method to close the file.
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102
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103 @param closeit flag to indicate a close ordered by the debugger code (boolean)
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104 """
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105 if closeit and not self.closed:
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106 self.flush()
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107 self.sock.close()
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108 self.closed = True
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109
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110 def flush(self):
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111 """
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112 Public method to write all pending bytes.
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113 """
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114 self.__nWrite(len(self.wpending))
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115
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116 def isatty(self):
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117 """
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118 Public method to indicate whether a tty interface is supported.
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119
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120 @return always false
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121 """
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122 return False
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123
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124 def fileno(self):
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125 """
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126 Public method returning the file number.
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127
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128 @return file number (int)
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129 """
111
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130 try:
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131 return self.sock.fileno()
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132 except socket.error:
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133 return -1
0
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134
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135 def readable(self):
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136 """
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137 Public method to check, if the stream is readable.
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138
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139 @return flag indicating a readable stream (boolean)
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140 """
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141 return self.mode == "r"
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142
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143 def read_p(self, size=-1):
0
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144 """
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parents:
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145 Public method to read bytes from this file.
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parents:
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146
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147 @param size maximum number of bytes to be read (int)
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148 @return the bytes read (any)
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parents:
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149 """
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parents:
diff changeset
150 self.__checkMode('r')
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151
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152 if size < 0:
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153 size = 20000
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154
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155 return self.sock.recv(size).decode('utf8')
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156
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157 def read(self, size=-1):
0
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158 """
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159 Public method to read bytes from this file.
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160
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161 @param size maximum number of bytes to be read (int)
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162 @return the bytes read (any)
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163 """
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parents:
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164 self.__checkMode('r')
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165
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166 buf = input()
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167 if size >= 0:
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168 buf = buf[:size]
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169 return buf
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170
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171 def readline_p(self, size=-1):
0
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172 """
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173 Public method to read a line from this file.
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174
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175 <b>Note</b>: This method will not block and may return
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176 only a part of a line if that is all that is available.
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177
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178 @param size maximum number of bytes to be read (int)
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179 @return one line of text up to size bytes (string)
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180 """
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parents:
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181 self.__checkMode('r')
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182
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183 if size < 0:
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184 size = 20000
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185
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parents:
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186 # The integration of the debugger client event loop and the connection
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187 # to the debugger relies on the two lines of the debugger command being
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188 # delivered as two separate events. Therefore we make sure we only
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189 # read a line at a time.
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190 line = self.sock.recv(size, socket.MSG_PEEK)
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191
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192 eol = line.find(b'\n')
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193
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194 if eol >= 0:
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diff changeset
195 size = eol + 1
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parents:
diff changeset
196 else:
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197 size = len(line)
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198
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199 # Now we know how big the line is, read it for real.
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200 return self.sock.recv(size).decode('utf8')
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201
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202 def readlines(self, sizehint=-1):
0
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203 """
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204 Public method to read all lines from this file.
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205
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206 @param sizehint hint of the numbers of bytes to be read (int)
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207 @return list of lines read (list of strings)
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208 """
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209 self.__checkMode('r')
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210
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211 lines = []
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diff changeset
212 room = sizehint
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213
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diff changeset
214 line = self.readline_p(room)
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215 linelen = len(line)
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216
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217 while linelen > 0:
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218 lines.append(line)
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219
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diff changeset
220 if sizehint >= 0:
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diff changeset
221 room = room - linelen
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parents:
diff changeset
222
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parents:
diff changeset
223 if room <= 0:
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parents:
diff changeset
224 break
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225
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diff changeset
226 line = self.readline_p(room)
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diff changeset
227 linelen = len(line)
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diff changeset
228
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diff changeset
229 return lines
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diff changeset
230
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231 def readline(self, sizehint=-1):
0
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parents:
diff changeset
232 """
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parents:
diff changeset
233 Public method to read one line from this file.
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parents:
diff changeset
234
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diff changeset
235 @param sizehint hint of the numbers of bytes to be read (int)
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parents:
diff changeset
236 @return one line read (string)
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parents:
diff changeset
237 """
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parents:
diff changeset
238 self.__checkMode('r')
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parents:
diff changeset
239
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parents:
diff changeset
240 line = input() + '\n'
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parents:
diff changeset
241 if sizehint >= 0:
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parents:
diff changeset
242 line = line[:sizehint]
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parents:
diff changeset
243 return line
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diff changeset
244
1213
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245 def seekable(self):
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246 """
5d4e67e59ed3 Added some more TextIOWrapper methods and attributes to the Python3 variant of AsyncFile.
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diff changeset
247 Public method to check, if the stream is seekable.
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248
5d4e67e59ed3 Added some more TextIOWrapper methods and attributes to the Python3 variant of AsyncFile.
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diff changeset
249 @return flag indicating a seekable stream (boolean)
5d4e67e59ed3 Added some more TextIOWrapper methods and attributes to the Python3 variant of AsyncFile.
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diff changeset
250 """
5d4e67e59ed3 Added some more TextIOWrapper methods and attributes to the Python3 variant of AsyncFile.
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diff changeset
251 return False
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diff changeset
252
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parents: 791
diff changeset
253 def seek(self, offset, whence=0):
0
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parents:
diff changeset
254 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
255 Public method to move the filepointer.
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
256
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parents:
diff changeset
257 @param offset offset to move the filepointer to (integer)
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parents:
diff changeset
258 @param whence position the offset relates to
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parents:
diff changeset
259 @exception IOError This method is not supported and always raises an
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parents:
diff changeset
260 IOError.
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
261 """
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parents:
diff changeset
262 raise IOError((29, '[Errno 29] Illegal seek'))
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parents:
diff changeset
263
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
264 def tell(self):
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
265 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
266 Public method to get the filepointer position.
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
267
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parents:
diff changeset
268 @exception IOError This method is not supported and always raises an
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parents:
diff changeset
269 IOError.
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parents:
diff changeset
270 """
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271 raise IOError((29, '[Errno 29] Illegal seek'))
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272
945
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273 def truncate(self, size=-1):
0
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274 """
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275 Public method to truncate the file.
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276
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277 @param size size to truncaze to (integer)
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278 @exception IOError This method is not supported and always raises an
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279 IOError.
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280 """
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281 raise IOError((29, '[Errno 29] Illegal seek'))
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282
1213
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283 def writable(self):
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284 """
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285 Public method to check, if a stream is writable.
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286
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287 @return flag indicating a writable stream (boolean)
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288 """
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289 return self.mode == "w"
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290
0
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291 def write(self, s):
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292 """
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293 Public method to write a string to the file.
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294
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295 @param s bytes to be written (string)
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296 """
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297 self.__checkMode('w')
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298 tries = 0
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299 if not self.wpending:
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300 self.wpending = s
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301 elif len(self.wpending) + len(s) > self.maxbuffersize:
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302 # flush wpending so that different string types are not concatenated
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303 while self.wpending:
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304 # if we have a persistent error in sending the data, an exception
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305 # will be raised in __nWrite
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306 self.flush()
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307 tries += 1
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308 if tries > self.maxtries:
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309 raise socket.error("Too many attempts to send data")
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310 self.wpending = s
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311 else:
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312 self.wpending += s
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313 self.__nWrite(self.pendingWrite())
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314
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315 def writelines(self, list):
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316 """
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317 Public method to write a list of strings to the file.
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318
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319 @param list the list to be written (list of string)
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320 """
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321 for l in list:
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322 self.write(l)

eric ide

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