Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/boto/sqs/message.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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1 # Copyright (c) 2006,2007 Mitch Garnaat http://garnaat.org/
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2 #
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3 # Permission is hereby granted, free of charge, to any person obtaining a
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4 # copy of this software and associated documentation files (the
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5 # "Software"), to deal in the Software without restriction, including
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6 # without limitation the rights to use, copy, modify, merge, publish, dis-
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7 # tribute, sublicense, and/or sell copies of the Software, and to permit
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8 # persons to whom the Software is furnished to do so, subject to the fol-
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9 # lowing conditions:
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10 #
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11 # The above copyright notice and this permission notice shall be included
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12 # in all copies or substantial portions of the Software.
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13 #
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14 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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15 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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16 # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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17 # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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18 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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20 # IN THE SOFTWARE.
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21
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22 """
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23 SQS Message
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24
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25 A Message represents the data stored in an SQS queue. The rules for what is allowed within an SQS
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26 Message are here:
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27
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28 http://docs.amazonwebservices.com/AWSSimpleQueueService/2008-01-01/SQSDeveloperGuide/Query_QuerySendMessage.html
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29
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30 So, at it's simplest level a Message just needs to allow a developer to store bytes in it and get the bytes
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31 back out. However, to allow messages to have richer semantics, the Message class must support the
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32 following interfaces:
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33
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34 The constructor for the Message class must accept a keyword parameter "queue" which is an instance of a
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35 boto Queue object and represents the queue that the message will be stored in. The default value for
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36 this parameter is None.
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37
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38 The constructor for the Message class must accept a keyword parameter "body" which represents the
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39 content or body of the message. The format of this parameter will depend on the behavior of the
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40 particular Message subclass. For example, if the Message subclass provides dictionary-like behavior to the
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41 user the body passed to the constructor should be a dict-like object that can be used to populate
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42 the initial state of the message.
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43
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44 The Message class must provide an encode method that accepts a value of the same type as the body
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45 parameter of the constructor and returns a string of characters that are able to be stored in an
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46 SQS message body (see rules above).
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47
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48 The Message class must provide a decode method that accepts a string of characters that can be
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49 stored (and probably were stored!) in an SQS message and return an object of a type that is consistent
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50 with the "body" parameter accepted on the class constructor.
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51
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52 The Message class must provide a __len__ method that will return the size of the encoded message
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53 that would be stored in SQS based on the current state of the Message object.
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54
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55 The Message class must provide a get_body method that will return the body of the message in the
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56 same format accepted in the constructor of the class.
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57
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58 The Message class must provide a set_body method that accepts a message body in the same format
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59 accepted by the constructor of the class. This method should alter to the internal state of the
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60 Message object to reflect the state represented in the message body parameter.
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61
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62 The Message class must provide a get_body_encoded method that returns the current body of the message
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63 in the format in which it would be stored in SQS.
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64 """
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65
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66 import base64
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67
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68 import boto
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69
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70 from boto.compat import StringIO
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71 from boto.compat import six
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72 from boto.sqs.attributes import Attributes
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73 from boto.sqs.messageattributes import MessageAttributes
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74 from boto.exception import SQSDecodeError
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75
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76 class RawMessage(object):
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77 """
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78 Base class for SQS messages. RawMessage does not encode the message
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79 in any way. Whatever you store in the body of the message is what
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80 will be written to SQS and whatever is returned from SQS is stored
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81 directly into the body of the message.
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82 """
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83
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84 def __init__(self, queue=None, body=''):
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85 self.queue = queue
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86 self.set_body(body)
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87 self.id = None
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88 self.receipt_handle = None
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89 self.md5 = None
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90 self.attributes = Attributes(self)
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91 self.message_attributes = MessageAttributes(self)
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92 self.md5_message_attributes = None
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93
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94 def __len__(self):
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95 return len(self.encode(self._body))
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96
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97 def startElement(self, name, attrs, connection):
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98 if name == 'Attribute':
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99 return self.attributes
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100 if name == 'MessageAttribute':
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101 return self.message_attributes
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102 return None
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103
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104 def endElement(self, name, value, connection):
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105 if name == 'Body':
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106 self.set_body(value)
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107 elif name == 'MessageId':
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108 self.id = value
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109 elif name == 'ReceiptHandle':
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110 self.receipt_handle = value
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111 elif name == 'MD5OfBody':
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112 self.md5 = value
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113 elif name == 'MD5OfMessageAttributes':
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114 self.md5_message_attributes = value
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115 else:
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116 setattr(self, name, value)
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117
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118 def endNode(self, connection):
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119 self.set_body(self.decode(self.get_body()))
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120
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121 def encode(self, value):
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122 """Transform body object into serialized byte array format."""
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123 return value
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124
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125 def decode(self, value):
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126 """Transform seralized byte array into any object."""
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127 return value
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128
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129 def set_body(self, body):
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130 """Override the current body for this object, using decoded format."""
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131 self._body = body
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132
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133 def get_body(self):
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134 return self._body
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135
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136 def get_body_encoded(self):
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137 """
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138 This method is really a semi-private method used by the Queue.write
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139 method when writing the contents of the message to SQS.
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140 You probably shouldn't need to call this method in the normal course of events.
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141 """
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142 return self.encode(self.get_body())
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143
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144 def delete(self):
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145 if self.queue:
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146 return self.queue.delete_message(self)
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147
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148 def change_visibility(self, visibility_timeout):
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149 if self.queue:
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150 self.queue.connection.change_message_visibility(self.queue,
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151 self.receipt_handle,
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152 visibility_timeout)
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153
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154 class Message(RawMessage):
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155 """
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156 The default Message class used for SQS queues. This class automatically
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157 encodes/decodes the message body using Base64 encoding to avoid any
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158 illegal characters in the message body. See:
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159
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160 https://forums.aws.amazon.com/thread.jspa?threadID=13067
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161
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162 for details on why this is a good idea. The encode/decode is meant to
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163 be transparent to the end-user.
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164 """
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165
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166 def encode(self, value):
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167 if not isinstance(value, six.binary_type):
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168 value = value.encode('utf-8')
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169 return base64.b64encode(value).decode('utf-8')
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170
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171 def decode(self, value):
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172 try:
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173 value = base64.b64decode(value.encode('utf-8')).decode('utf-8')
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174 except:
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175 boto.log.warning('Unable to decode message')
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176 return value
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177 return value
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178
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179 class MHMessage(Message):
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180 """
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181 The MHMessage class provides a message that provides RFC821-like
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182 headers like this:
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183
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184 HeaderName: HeaderValue
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185
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186 The encoding/decoding of this is handled automatically and after
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187 the message body has been read, the message instance can be treated
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188 like a mapping object, i.e. m['HeaderName'] would return 'HeaderValue'.
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189 """
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190
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191 def __init__(self, queue=None, body=None, xml_attrs=None):
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192 if body is None or body == '':
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193 body = {}
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194 super(MHMessage, self).__init__(queue, body)
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195
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196 def decode(self, value):
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197 try:
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198 msg = {}
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199 fp = StringIO(value)
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200 line = fp.readline()
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201 while line:
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202 delim = line.find(':')
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203 key = line[0:delim]
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204 value = line[delim+1:].strip()
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205 msg[key.strip()] = value.strip()
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206 line = fp.readline()
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207 except:
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208 raise SQSDecodeError('Unable to decode message', self)
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209 return msg
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210
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211 def encode(self, value):
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212 s = ''
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213 for item in value.items():
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214 s = s + '%s: %s\n' % (item[0], item[1])
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215 return s
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216
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217 def __contains__(self, key):
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218 return key in self._body
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219
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220 def __getitem__(self, key):
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221 if key in self._body:
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222 return self._body[key]
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223 else:
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224 raise KeyError(key)
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225
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226 def __setitem__(self, key, value):
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227 self._body[key] = value
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228 self.set_body(self._body)
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229
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230 def keys(self):
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231 return self._body.keys()
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232
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233 def values(self):
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234 return self._body.values()
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235
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236 def items(self):
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237 return self._body.items()
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238
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239 def has_key(self, key):
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240 return key in self._body
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241
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242 def update(self, d):
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243 self._body.update(d)
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244 self.set_body(self._body)
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245
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246 def get(self, key, default=None):
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247 return self._body.get(key, default)
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248
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249 class EncodedMHMessage(MHMessage):
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250 """
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251 The EncodedMHMessage class provides a message that provides RFC821-like
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252 headers like this:
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253
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254 HeaderName: HeaderValue
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255
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256 This variation encodes/decodes the body of the message in base64 automatically.
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257 The message instance can be treated like a mapping object,
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258 i.e. m['HeaderName'] would return 'HeaderValue'.
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259 """
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260
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261 def decode(self, value):
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262 try:
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263 value = base64.b64decode(value.encode('utf-8')).decode('utf-8')
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264 except:
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265 raise SQSDecodeError('Unable to decode message', self)
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266 return super(EncodedMHMessage, self).decode(value)
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267
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268 def encode(self, value):
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269 value = super(EncodedMHMessage, self).encode(value)
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270 return base64.b64encode(value.encode('utf-8')).decode('utf-8')
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271