Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/boltons/socketutils.py @ 3:758bc20232e8 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:20:52 -0400
parents 26e78fe6e8c4
children
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1 # -*- coding: utf-8 -*-
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2 """At its heart, Python can be viewed as an extension of the C
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3 programming language. Springing from the most popular systems
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4 programming language has made Python itself a great language for
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5 systems programming. One key to success in this domain is Python's
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6 very serviceable :mod:`socket` module and its :class:`socket.socket`
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7 type.
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8
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9 The ``socketutils`` module provides natural next steps to the ``socket``
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10 builtin: straightforward, tested building blocks for higher-level
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11 protocols.
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12
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13 The :class:`BufferedSocket` wraps an ordinary socket, providing a
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14 layer of intuitive buffering for both sending and receiving. This
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15 facilitates parsing messages from streams, i.e., all sockets with type
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16 ``SOCK_STREAM``. The BufferedSocket enables receiving until the next
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17 relevant token, up to a certain size, or until the connection is
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18 closed. For all of these, it provides consistent APIs to size
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19 limiting, as well as timeouts that are compatible with multiple
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20 concurrency paradigms. Use it to parse the next one-off text or binary
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21 socket protocol you encounter.
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22
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23 This module also provides the :class:`NetstringSocket`, a pure-Python
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24 implementation of `the Netstring protocol`_, built on top of the
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25 :class:`BufferedSocket`, serving as a ready-made, production-grade example.
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26
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27 Special thanks to `Kurt Rose`_ for his original authorship and all his
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28 contributions on this module. Also thanks to `Daniel J. Bernstein`_, the
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29 original author of `Netstring`_.
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30
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31 .. _the Netstring protocol: https://en.wikipedia.org/wiki/Netstring
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32 .. _Kurt Rose: https://github.com/doublereedkurt
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33 .. _Daniel J. Bernstein: https://cr.yp.to/
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34 .. _Netstring: https://cr.yp.to/proto/netstrings.txt
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35
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36 """
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37
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38 import time
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39 import socket
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40
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41 try:
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42 from threading import RLock
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43 except Exception:
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44 class RLock(object):
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45 'Dummy reentrant lock for builds without threads'
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46 def __enter__(self):
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47 pass
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48
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49 def __exit__(self, exctype, excinst, exctb):
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50 pass
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51
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52
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53 try:
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54 from typeutils import make_sentinel
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55 _UNSET = make_sentinel(var_name='_UNSET')
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56 except ImportError:
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57 _UNSET = object()
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58
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59
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60 DEFAULT_TIMEOUT = 10 # 10 seconds
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61 DEFAULT_MAXSIZE = 32 * 1024 # 32kb
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62 _RECV_LARGE_MAXSIZE = 1024 ** 5 # 1PB
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63
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64
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65 class BufferedSocket(object):
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66 """Mainly provides recv_until and recv_size. recv, send, sendall, and
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67 peek all function as similarly as possible to the built-in socket
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68 API.
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69
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70 This type has been tested against both the built-in socket type as
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71 well as those from gevent and eventlet. It also features support
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72 for sockets with timeouts set to 0 (aka nonblocking), provided the
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73 caller is prepared to handle the EWOULDBLOCK exceptions.
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74
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75 Args:
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76 sock (socket): The connected socket to be wrapped.
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77 timeout (float): The default timeout for sends and recvs, in
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78 seconds. Set to ``None`` for no timeout, and 0 for
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79 nonblocking. Defaults to *sock*'s own timeout if already set,
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80 and 10 seconds otherwise.
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81 maxsize (int): The default maximum number of bytes to be received
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82 into the buffer before it is considered full and raises an
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83 exception. Defaults to 32 kilobytes.
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84 recvsize (int): The number of bytes to recv for every
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85 lower-level :meth:`socket.recv` call. Defaults to *maxsize*.
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86
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87 *timeout* and *maxsize* can both be overridden on individual socket
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88 operations.
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89
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90 All ``recv`` methods return bytestrings (:class:`bytes`) and can
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91 raise :exc:`socket.error`. :exc:`Timeout`,
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92 :exc:`ConnectionClosed`, and :exc:`MessageTooLong` all inherit
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93 from :exc:`socket.error` and exist to provide better error
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94 messages. Received bytes are always buffered, even if an exception
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95 is raised. Use :meth:`BufferedSocket.getrecvbuffer` to retrieve
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96 partial recvs.
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97
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98 BufferedSocket does not replace the built-in socket by any
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99 means. While the overlapping parts of the API are kept parallel to
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100 the built-in :class:`socket.socket`, BufferedSocket does not
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101 inherit from socket, and most socket functionality is only
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102 available on the underlying socket. :meth:`socket.getpeername`,
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103 :meth:`socket.getsockname`, :meth:`socket.fileno`, and others are
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104 only available on the underlying socket that is wrapped. Use the
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105 ``BufferedSocket.sock`` attribute to access it. See the examples
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106 for more information on how to use BufferedSockets with built-in
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107 sockets.
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108
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109 The BufferedSocket is threadsafe, but consider the semantics of
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110 your protocol before accessing a single socket from multiple
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111 threads. Similarly, once the BufferedSocket is constructed, avoid
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112 using the underlying socket directly. Only use it for operations
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113 unrelated to messages, e.g., :meth:`socket.getpeername`.
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114
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115 """
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116 def __init__(self, sock, timeout=_UNSET,
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117 maxsize=DEFAULT_MAXSIZE, recvsize=_UNSET):
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118 self.sock = sock
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119 self.rbuf = b''
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120 self.sbuf = []
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121 self.maxsize = int(maxsize)
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122
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123 if timeout is _UNSET:
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124 if self.sock.gettimeout() is None:
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125 self.timeout = DEFAULT_TIMEOUT
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126 else:
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127 self.timeout = self.sock.gettimeout()
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128 else:
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129 if timeout is None:
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130 self.timeout = timeout
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131 else:
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132 self.timeout = float(timeout)
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133
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134 if recvsize is _UNSET:
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135 self._recvsize = self.maxsize
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136 else:
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137 self._recvsize = int(recvsize)
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138
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139 self._send_lock = RLock()
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140 self._recv_lock = RLock()
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141
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142 def settimeout(self, timeout):
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143 "Set the default *timeout* for future operations, in seconds."
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144 self.timeout = timeout
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145
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146 def gettimeout(self):
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147 return self.timeout
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148
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149 def setblocking(self, blocking):
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150 self.timeout = None if blocking else 0.0
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151
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152 def setmaxsize(self, maxsize):
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153 """Set the default maximum buffer size *maxsize* for future
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154 operations, in bytes. Does not truncate the current buffer.
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155 """
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156 self.maxsize = maxsize
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157
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158 def getrecvbuffer(self):
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159 "Returns the receive buffer bytestring (rbuf)."
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160 with self._recv_lock:
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161 return self.rbuf
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162
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163 def getsendbuffer(self):
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164 "Returns a copy of the send buffer list."
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165 with self._send_lock:
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166 return b''.join(self.sbuf)
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167
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168 def recv(self, size, flags=0, timeout=_UNSET):
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169 """Returns **up to** *size* bytes, using the internal buffer before
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170 performing a single :meth:`socket.recv` operation.
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171
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172 Args:
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173 size (int): The maximum number of bytes to receive.
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174 flags (int): Kept for API compatibility with sockets. Only
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175 the default, ``0``, is valid.
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176 timeout (float): The timeout for this operation. Can be
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177 ``0`` for nonblocking and ``None`` for no
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178 timeout. Defaults to the value set in the constructor
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179 of BufferedSocket.
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180
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181 If the operation does not complete in *timeout* seconds, a
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182 :exc:`Timeout` is raised. Much like the built-in
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183 :class:`socket.socket`, if this method returns an empty string,
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184 then the socket is closed and recv buffer is empty. Further
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185 calls to recv will raise :exc:`socket.error`.
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186
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187 """
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188 with self._recv_lock:
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189 if timeout is _UNSET:
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190 timeout = self.timeout
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191 if flags:
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192 raise ValueError("non-zero flags not supported: %r" % flags)
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193 if len(self.rbuf) >= size:
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194 data, self.rbuf = self.rbuf[:size], self.rbuf[size:]
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195 return data
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196 if self.rbuf:
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197 ret, self.rbuf = self.rbuf, b''
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198 return ret
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199 self.sock.settimeout(timeout)
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200 try:
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201 data = self.sock.recv(self._recvsize)
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202 except socket.timeout:
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203 raise Timeout(timeout) # check the rbuf attr for more
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204 if len(data) > size:
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205 data, self.rbuf = data[:size], data[size:]
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206 return data
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207
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208 def peek(self, size, timeout=_UNSET):
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209 """Returns *size* bytes from the socket and/or internal buffer. Bytes
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210 are retained in BufferedSocket's internal recv buffer. To only
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211 see bytes in the recv buffer, use :meth:`getrecvbuffer`.
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212
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213 Args:
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214 size (int): The exact number of bytes to peek at
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215 timeout (float): The timeout for this operation. Can be 0 for
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216 nonblocking and None for no timeout. Defaults to the value
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217 set in the constructor of BufferedSocket.
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218
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219 If the appropriate number of bytes cannot be fetched from the
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220 buffer and socket before *timeout* expires, then a
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221 :exc:`Timeout` will be raised. If the connection is closed, a
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222 :exc:`ConnectionClosed` will be raised.
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223 """
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224 with self._recv_lock:
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225 if len(self.rbuf) >= size:
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226 return self.rbuf[:size]
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227 data = self.recv_size(size, timeout=timeout)
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228 self.rbuf = data + self.rbuf
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229 return data
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230
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231 def recv_close(self, timeout=_UNSET, maxsize=_UNSET):
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232 """Receive until the connection is closed, up to *maxsize* bytes. If
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233 more than *maxsize* bytes are received, raises :exc:`MessageTooLong`.
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234 """
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235 # recv_close works by using recv_size to request maxsize data,
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236 # and ignoring ConnectionClose, returning and clearing the
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237 # internal buffer instead. It raises an exception if
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238 # ConnectionClosed isn't raised.
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239 with self._recv_lock:
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240 if maxsize is _UNSET:
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241 maxsize = self.maxsize
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242 if maxsize is None:
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243 maxsize = _RECV_LARGE_MAXSIZE
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244 try:
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245 recvd = self.recv_size(maxsize + 1, timeout)
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246 except ConnectionClosed:
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247 ret, self.rbuf = self.rbuf, b''
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248 else:
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249 # put extra received bytes (now in rbuf) after recvd
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250 self.rbuf = recvd + self.rbuf
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251 size_read = min(maxsize, len(self.rbuf))
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252 raise MessageTooLong(size_read) # check receive buffer
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253 return ret
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254
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255 def recv_until(self, delimiter, timeout=_UNSET, maxsize=_UNSET,
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256 with_delimiter=False):
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257 """Receive until *delimiter* is found, *maxsize* bytes have been read,
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258 or *timeout* is exceeded.
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259
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260 Args:
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261 delimiter (bytes): One or more bytes to be searched for
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262 in the socket stream.
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263 timeout (float): The timeout for this operation. Can be 0 for
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264 nonblocking and None for no timeout. Defaults to the value
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265 set in the constructor of BufferedSocket.
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266 maxsize (int): The maximum size for the internal buffer.
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267 Defaults to the value set in the constructor.
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268 with_delimiter (bool): Whether or not to include the
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269 delimiter in the output. ``False`` by default, but
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270 ``True`` is useful in cases where one is simply
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271 forwarding the messages.
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272
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273 ``recv_until`` will raise the following exceptions:
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274
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275 * :exc:`Timeout` if more than *timeout* seconds expire.
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276 * :exc:`ConnectionClosed` if the underlying socket is closed
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277 by the sending end.
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278 * :exc:`MessageTooLong` if the delimiter is not found in the
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279 first *maxsize* bytes.
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280 * :exc:`socket.error` if operating in nonblocking mode
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281 (*timeout* equal to 0), or if some unexpected socket error
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282 occurs, such as operating on a closed socket.
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283
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284 """
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285 with self._recv_lock:
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286 if maxsize is _UNSET:
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287 maxsize = self.maxsize
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288 if maxsize is None:
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289 maxsize = _RECV_LARGE_MAXSIZE
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290 if timeout is _UNSET:
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291 timeout = self.timeout
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292 len_delimiter = len(delimiter)
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293
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294 sock = self.sock
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295 recvd = bytearray(self.rbuf)
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296 start = time.time()
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297 find_offset_start = 0 # becomes a negative index below
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298
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299 if not timeout: # covers None (no timeout) and 0 (nonblocking)
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300 sock.settimeout(timeout)
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301 try:
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302 while 1:
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303 offset = recvd.find(delimiter, find_offset_start, maxsize)
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304 if offset != -1: # str.find returns -1 when no match found
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305 if with_delimiter: # include delimiter in return
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306 offset += len_delimiter
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307 rbuf_offset = offset
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308 else:
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309 rbuf_offset = offset + len_delimiter
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310 break
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311 elif len(recvd) > maxsize:
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312 raise MessageTooLong(maxsize, delimiter) # see rbuf
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313 if timeout:
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314 cur_timeout = timeout - (time.time() - start)
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315 if cur_timeout <= 0.0:
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316 raise socket.timeout()
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317 sock.settimeout(cur_timeout)
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318 nxt = sock.recv(self._recvsize)
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319 if not nxt:
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320 args = (len(recvd), delimiter)
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321 msg = ('connection closed after reading %s bytes'
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322 ' without finding symbol: %r' % args)
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323 raise ConnectionClosed(msg) # check the recv buffer
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324 recvd.extend(nxt)
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325 find_offset_start = -len(nxt) - len_delimiter + 1
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326 except socket.timeout:
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327 self.rbuf = bytes(recvd)
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328 msg = ('read %s bytes without finding delimiter: %r'
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329 % (len(recvd), delimiter))
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330 raise Timeout(timeout, msg) # check the recv buffer
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331 except Exception:
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332 self.rbuf = bytes(recvd)
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333 raise
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334 val, self.rbuf = bytes(recvd[:offset]), bytes(recvd[rbuf_offset:])
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335 return val
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336
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337 def recv_size(self, size, timeout=_UNSET):
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338 """Read off of the internal buffer, then off the socket, until
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339 *size* bytes have been read.
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340
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341 Args:
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342 size (int): number of bytes to read before returning.
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343 timeout (float): The timeout for this operation. Can be 0 for
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344 nonblocking and None for no timeout. Defaults to the value
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345 set in the constructor of BufferedSocket.
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346
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347 If the appropriate number of bytes cannot be fetched from the
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348 buffer and socket before *timeout* expires, then a
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349 :exc:`Timeout` will be raised. If the connection is closed, a
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350 :exc:`ConnectionClosed` will be raised.
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351 """
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352 with self._recv_lock:
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353 if timeout is _UNSET:
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354 timeout = self.timeout
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355 chunks = []
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356 total_bytes = 0
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357 try:
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358 start = time.time()
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359 self.sock.settimeout(timeout)
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360 nxt = self.rbuf or self.sock.recv(self._recvsize)
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361 while nxt:
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362 total_bytes += len(nxt)
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363 if total_bytes >= size:
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364 break
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365 chunks.append(nxt)
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366 if timeout:
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367 cur_timeout = timeout - (time.time() - start)
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368 if cur_timeout <= 0.0:
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369 raise socket.timeout()
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370 self.sock.settimeout(cur_timeout)
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371 nxt = self.sock.recv(self._recvsize)
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372 else:
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373 msg = ('connection closed after reading %s of %s requested'
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parents:
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374 ' bytes' % (total_bytes, size))
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parents:
diff changeset
375 raise ConnectionClosed(msg) # check recv buffer
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376 except socket.timeout:
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377 self.rbuf = b''.join(chunks)
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378 msg = 'read %s of %s bytes' % (total_bytes, size)
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379 raise Timeout(timeout, msg) # check recv buffer
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380 except Exception:
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381 # received data is still buffered in the case of errors
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diff changeset
382 self.rbuf = b''.join(chunks)
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383 raise
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384 extra_bytes = total_bytes - size
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385 if extra_bytes:
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diff changeset
386 last, self.rbuf = nxt[:-extra_bytes], nxt[-extra_bytes:]
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diff changeset
387 else:
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388 last, self.rbuf = nxt, b''
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389 chunks.append(last)
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390 return b''.join(chunks)
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391
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diff changeset
392 def send(self, data, flags=0, timeout=_UNSET):
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393 """Send the contents of the internal send buffer, as well as *data*,
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394 to the receiving end of the connection. Returns the total
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diff changeset
395 number of bytes sent. If no exception is raised, all of *data* was
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396 sent and the internal send buffer is empty.
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397
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398 Args:
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399 data (bytes): The bytes to send.
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400 flags (int): Kept for API compatibility with sockets. Only
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401 the default 0 is valid.
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402 timeout (float): The timeout for this operation. Can be 0 for
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403 nonblocking and None for no timeout. Defaults to the value
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404 set in the constructor of BufferedSocket.
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405
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406 Will raise :exc:`Timeout` if the send operation fails to
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407 complete before *timeout*. In the event of an exception, use
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408 :meth:`BufferedSocket.getsendbuffer` to see which data was
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409 unsent.
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410 """
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411 with self._send_lock:
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412 if timeout is _UNSET:
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413 timeout = self.timeout
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414 if flags:
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415 raise ValueError("non-zero flags not supported")
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416 sbuf = self.sbuf
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417 sbuf.append(data)
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418 if len(sbuf) > 1:
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419 sbuf[:] = [b''.join([s for s in sbuf if s])]
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420 self.sock.settimeout(timeout)
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421 start, total_sent = time.time(), 0
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diff changeset
422 try:
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423 while sbuf[0]:
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424 sent = self.sock.send(sbuf[0])
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425 total_sent += sent
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426 sbuf[0] = sbuf[0][sent:]
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diff changeset
427 if timeout:
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428 cur_timeout = timeout - (time.time() - start)
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diff changeset
429 if cur_timeout <= 0.0:
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diff changeset
430 raise socket.timeout()
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diff changeset
431 self.sock.settimeout(cur_timeout)
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432 except socket.timeout:
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433 raise Timeout(timeout, '%s bytes unsent' % len(sbuf[0]))
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434 return total_sent
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diff changeset
435
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diff changeset
436 def sendall(self, data, flags=0, timeout=_UNSET):
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diff changeset
437 """A passthrough to :meth:`~BufferedSocket.send`, retained for
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
438 parallelism to the :class:`socket.socket` API.
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439 """
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440 return self.send(data, flags, timeout)
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diff changeset
441
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442 def flush(self):
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diff changeset
443 "Send the contents of the internal send buffer."
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444 with self._send_lock:
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diff changeset
445 self.send(b'')
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446 return
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447
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448 def buffer(self, data):
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449 "Buffer *data* bytes for the next send operation."
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450 with self._send_lock:
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451 self.sbuf.append(data)
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452 return
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453
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454 # # #
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455 # # # Passing through some socket basics
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diff changeset
456 # # #
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diff changeset
457
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diff changeset
458 def getsockname(self):
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parents:
diff changeset
459 """Convenience function to return the wrapped socket's own address.
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parents:
diff changeset
460 See :meth:`socket.getsockname` for more details.
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diff changeset
461 """
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diff changeset
462 return self.sock.getsockname()
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diff changeset
463
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diff changeset
464 def getpeername(self):
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diff changeset
465 """Convenience function to return the remote address to which the
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diff changeset
466 wrapped socket is connected. See :meth:`socket.getpeername`
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parents:
diff changeset
467 for more details.
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diff changeset
468 """
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diff changeset
469 return self.sock.getpeername()
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diff changeset
470
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diff changeset
471 def getsockopt(self, level, optname, buflen=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
472 """Convenience function passing through to the wrapped socket's
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diff changeset
473 :meth:`socket.getsockopt`.
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parents:
diff changeset
474 """
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475 args = (level, optname)
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parents:
diff changeset
476 if buflen is not None:
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diff changeset
477 args += (buflen,)
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diff changeset
478 return self.sock.getsockopt(*args)
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diff changeset
479
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diff changeset
480 def setsockopt(self, level, optname, value):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
481 """Convenience function passing through to the wrapped socket's
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parents:
diff changeset
482 :meth:`socket.setsockopt`.
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parents:
diff changeset
483 """
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diff changeset
484 return self.sock.setsockopt(level, optname, value)
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parents:
diff changeset
485
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diff changeset
486 @property
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parents:
diff changeset
487 def type(self):
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parents:
diff changeset
488 """A passthrough to the wrapped socket's type. Valid usages should
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
489 only ever see :data:`socket.SOCK_STREAM`.
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parents:
diff changeset
490 """
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parents:
diff changeset
491 return self.sock.type
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parents:
diff changeset
492
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diff changeset
493 @property
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parents:
diff changeset
494 def family(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
495 """A passthrough to the wrapped socket's family. BufferedSocket
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
496 supports all widely-used families, so this read-only attribute
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
497 can be one of :data:`socket.AF_INET` for IP,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
498 :data:`socket.AF_INET6` for IPv6, and :data:`socket.AF_UNIX`
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parents:
diff changeset
499 for UDS.
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parents:
diff changeset
500 """
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parents:
diff changeset
501 return self.sock.family
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parents:
diff changeset
502
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parents:
diff changeset
503 @property
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parents:
diff changeset
504 def proto(self):
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parents:
diff changeset
505 """A passthrough to the wrapped socket's protocol. The ``proto``
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
506 attribute is very rarely used, so it's always 0, meaning "the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
507 default" protocol. Pretty much all the practical information
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
508 is in :attr:`~BufferedSocket.type` and
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
509 :attr:`~BufferedSocket.family`, so you can go back to never
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
510 thinking about this.
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511 """
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512 return self.sock.proto
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513
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514 # # #
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515 # # # Now for some more advanced interpretations of the builtin socket
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516 # # #
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517
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518 def fileno(self):
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519 """Returns the file descriptor of the wrapped socket. -1 if it has
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520 been closed on this end.
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521
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522 Note that this makes the BufferedSocket selectable, i.e.,
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523 usable for operating system event loops without any external
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524 libraries. Keep in mind that the operating system cannot know
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525 about data in BufferedSocket's internal buffer. Exercise
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526 discipline with calling ``recv*`` functions.
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527 """
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528 return self.sock.fileno()
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529
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530 def close(self):
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531 """Closes the wrapped socket, and empties the internal buffers. The
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532 send buffer is not flushed automatically, so if you have been
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533 calling :meth:`~BufferedSocket.buffer`, be sure to call
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534 :meth:`~BufferedSocket.flush` before calling this
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535 method. After calling this method, future socket operations
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536 will raise :exc:`socket.error`.
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537 """
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538 with self._recv_lock:
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539 with self._send_lock:
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540 self.rbuf = b''
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541 self.rbuf_unconsumed = self.rbuf
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542 self.sbuf[:] = []
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543 self.sock.close()
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544 return
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545
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546 def shutdown(self, how):
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547 """Convenience method which passes through to the wrapped socket's
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548 :meth:`~socket.shutdown`. Semantics vary by platform, so no
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549 special internal handling is done with the buffers. This
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550 method exists to facilitate the most common usage, wherein a
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551 full ``shutdown`` is followed by a
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552 :meth:`~BufferedSocket.close`. Developers requiring more
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553 support, please open `an issue`_.
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554
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555 .. _an issue: https://github.com/mahmoud/boltons/issues
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556 """
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557 with self._recv_lock:
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558 with self._send_lock:
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diff changeset
559 self.sock.shutdown(how)
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560 return
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561
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562 # end BufferedSocket
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563
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564
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565 class Error(socket.error):
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566 """A subclass of :exc:`socket.error` from which all other
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567 ``socketutils`` exceptions inherit.
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568
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569 When using :class:`BufferedSocket` and other ``socketutils``
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diff changeset
570 types, generally you want to catch one of the specific exception
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571 types below, or :exc:`socket.error`.
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572 """
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573 pass
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574
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575
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576 class ConnectionClosed(Error):
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577 """Raised when receiving and the connection is unexpectedly closed
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578 from the sending end. Raised from :class:`BufferedSocket`'s
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579 :meth:`~BufferedSocket.peek`, :meth:`~BufferedSocket.recv_until`,
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580 and :meth:`~BufferedSocket.recv_size`, and never from its
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diff changeset
581 :meth:`~BufferedSocket.recv` or
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582 :meth:`~BufferedSocket.recv_close`.
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583 """
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584 pass
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585
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586
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587 class MessageTooLong(Error):
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588 """Raised from :meth:`BufferedSocket.recv_until` and
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diff changeset
589 :meth:`BufferedSocket.recv_closed` when more than *maxsize* bytes are
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590 read without encountering the delimiter or a closed connection,
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diff changeset
591 respectively.
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592 """
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593 def __init__(self, bytes_read=None, delimiter=None):
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594 msg = 'message exceeded maximum size'
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595 if bytes_read is not None:
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596 msg += '. %s bytes read' % (bytes_read,)
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597 if delimiter is not None:
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diff changeset
598 msg += '. Delimiter not found: %r' % (delimiter,)
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599 super(MessageTooLong, self).__init__(msg)
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600
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601
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602 class Timeout(socket.timeout, Error):
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603 """Inheriting from :exc:`socket.timeout`, Timeout is used to indicate
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604 when a socket operation did not complete within the time
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
605 specified. Raised from any of :class:`BufferedSocket`'s ``recv``
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606 methods.
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607 """
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608 def __init__(self, timeout, extra=""):
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diff changeset
609 msg = 'socket operation timed out'
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diff changeset
610 if timeout is not None:
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diff changeset
611 msg += ' after %sms.' % (timeout * 1000)
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612 if extra:
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613 msg += ' ' + extra
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614 super(Timeout, self).__init__(msg)
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615
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616
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617 class NetstringSocket(object):
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618 """
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619 Reads and writes using the netstring protocol.
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620
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621 More info: https://en.wikipedia.org/wiki/Netstring
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622 Even more info: http://cr.yp.to/proto/netstrings.txt
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623 """
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624 def __init__(self, sock, timeout=DEFAULT_TIMEOUT, maxsize=DEFAULT_MAXSIZE):
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625 self.bsock = BufferedSocket(sock)
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626 self.timeout = timeout
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627 self.maxsize = maxsize
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628 self._msgsize_maxsize = len(str(maxsize)) + 1 # len(str()) == log10
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629
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630 def fileno(self):
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631 return self.bsock.fileno()
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632
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633 def settimeout(self, timeout):
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634 self.timeout = timeout
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635
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636 def setmaxsize(self, maxsize):
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637 self.maxsize = maxsize
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638 self._msgsize_maxsize = self._calc_msgsize_maxsize(maxsize)
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639
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640 def _calc_msgsize_maxsize(self, maxsize):
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641 return len(str(maxsize)) + 1 # len(str()) == log10
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642
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643 def read_ns(self, timeout=_UNSET, maxsize=_UNSET):
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644 if timeout is _UNSET:
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645 timeout = self.timeout
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646
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647 if maxsize is _UNSET:
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648 maxsize = self.maxsize
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649 msgsize_maxsize = self._msgsize_maxsize
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650 else:
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651 msgsize_maxsize = self._calc_msgsize_maxsize(maxsize)
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652
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653 size_prefix = self.bsock.recv_until(b':',
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654 timeout=timeout,
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655 maxsize=msgsize_maxsize)
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656 try:
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657 size = int(size_prefix)
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658 except ValueError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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659 raise NetstringInvalidSize('netstring message size must be valid'
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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660 ' integer, not %r' % size_prefix)
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661
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662 if size > maxsize:
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663 raise NetstringMessageTooLong(size, maxsize)
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664 payload = self.bsock.recv_size(size)
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665 if self.bsock.recv(1) != b',':
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666 raise NetstringProtocolError("expected trailing ',' after message")
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667
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668 return payload
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669
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670 def write_ns(self, payload):
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671 size = len(payload)
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672 if size > self.maxsize:
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673 raise NetstringMessageTooLong(size, self.maxsize)
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674 data = str(size).encode('ascii') + b':' + payload + b','
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675 self.bsock.send(data)
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676
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677
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678 class NetstringProtocolError(Error):
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679 "Base class for all of socketutils' Netstring exception types."
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680 pass
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681
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682
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683 class NetstringInvalidSize(NetstringProtocolError):
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684 """NetstringInvalidSize is raised when the ``:``-delimited size prefix
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685 of the message does not contain a valid integer.
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686
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687 Message showing valid size::
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688
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689 5:hello,
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690
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691 Here the ``5`` is the size. Anything in this prefix position that
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692 is not parsable as a Python integer (i.e., :class:`int`) will raise
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693 this exception.
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694 """
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695 def __init__(self, msg):
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696 super(NetstringInvalidSize, self).__init__(msg)
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697
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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698
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699 class NetstringMessageTooLong(NetstringProtocolError):
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700 """NetstringMessageTooLong is raised when the size prefix contains a
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701 valid integer, but that integer is larger than the
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702 :class:`NetstringSocket`'s configured *maxsize*.
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703
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704 When this exception is raised, it's recommended to simply close
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705 the connection instead of trying to recover.
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706 """
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707 def __init__(self, size, maxsize):
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708 msg = ('netstring message length exceeds configured maxsize: %s > %s'
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709 % (size, maxsize))
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710 super(NetstringMessageTooLong, self).__init__(msg)
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711
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712
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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713 """
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parents:
diff changeset
714 attrs worth adding/passing through:
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parents:
diff changeset
715
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
716
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
717 properties: type, proto
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diff changeset
718
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
719 For its main functionality, BufferedSocket can wrap any object that
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
720 has the following methods:
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diff changeset
721
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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722 - gettimeout()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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723 - settimeout()
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diff changeset
724 - recv(size)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
725 - send(data)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
726
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
727 The following methods are passed through:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
728
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
729 ...
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
730
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
731 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
732
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
733 # TODO: buffered socket check socket.type == SOCK_STREAM?
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
734 # TODO: make recv_until support taking a regex
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
735 # TODO: including the delimiter in the recv_until return is not
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
736 # necessary, as ConnectionClosed differentiates empty messages
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
737 # from socket closes.