Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/boto/sdb/db/sequence.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 # Copyright (c) 2010 Chris Moyer http://coredumped.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 from boto.exception import SDBResponseError
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23 from boto.compat import six
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24
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25 class SequenceGenerator(object):
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26 """Generic Sequence Generator object, this takes a single
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27 string as the "sequence" and uses that to figure out
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28 what the next value in a string is. For example
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29 if you give "ABC" and pass in "A" it will give you "B",
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30 and if you give it "C" it will give you "AA".
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31
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32 If you set "rollover" to True in the above example, passing
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33 in "C" would give you "A" again.
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34
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35 The Sequence string can be a string or any iterable
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36 that has the "index" function and is indexable.
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37 """
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38 __name__ = "SequenceGenerator"
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39
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40 def __init__(self, sequence_string, rollover=False):
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41 """Create a new SequenceGenerator using the sequence_string
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42 as how to generate the next item.
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43
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44 :param sequence_string: The string or list that explains
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45 how to generate the next item in the sequence
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46 :type sequence_string: str,iterable
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47
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48 :param rollover: Rollover instead of incrementing when
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49 we hit the end of the sequence
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50 :type rollover: bool
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51 """
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52 self.sequence_string = sequence_string
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53 self.sequence_length = len(sequence_string[0])
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54 self.rollover = rollover
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55 self.last_item = sequence_string[-1]
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56 self.__name__ = "%s('%s')" % (self.__class__.__name__, sequence_string)
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57
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58 def __call__(self, val, last=None):
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59 """Get the next value in the sequence"""
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60 # If they pass us in a string that's not at least
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61 # the lenght of our sequence, then return the
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62 # first element in our sequence
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63 if val is None or len(val) < self.sequence_length:
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64 return self.sequence_string[0]
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65 last_value = val[-self.sequence_length:]
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66 if (not self.rollover) and (last_value == self.last_item):
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67 val = "%s%s" % (self(val[:-self.sequence_length]), self._inc(last_value))
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68 else:
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69 val = "%s%s" % (val[:-self.sequence_length], self._inc(last_value))
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70 return val
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71
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72 def _inc(self, val):
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73 """Increment a single value"""
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74 assert(len(val) == self.sequence_length)
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75 return self.sequence_string[(self.sequence_string.index(val) + 1) % len(self.sequence_string)]
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76
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77
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78 #
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79 # Simple Sequence Functions
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80 #
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81 def increment_by_one(cv=None, lv=None):
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82 if cv is None:
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83 return 0
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84 return cv + 1
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85
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86 def double(cv=None, lv=None):
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87 if cv is None:
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88 return 1
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89 return cv * 2
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90
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91 def fib(cv=1, lv=0):
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92 """The fibonacci sequence, this incrementer uses the
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93 last value"""
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94 if cv is None:
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95 cv = 1
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96 if lv is None:
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97 lv = 0
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98 return cv + lv
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99
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100 increment_string = SequenceGenerator("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
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101
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102
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103 class Sequence(object):
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104 """A simple Sequence using the new SDB "Consistent" features
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105 Based largly off of the "Counter" example from mitch garnaat:
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106 http://bitbucket.org/mitch/stupidbototricks/src/tip/counter.py"""
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107
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108 def __init__(self, id=None, domain_name=None, fnc=increment_by_one, init_val=None):
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109 """Create a new Sequence, using an optional function to
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110 increment to the next number, by default we just increment by one.
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111 Every parameter here is optional, if you don't specify any options
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112 then you'll get a new SequenceGenerator with a random ID stored in the
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113 default domain that increments by one and uses the default botoweb
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114 environment
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115
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116 :param id: Optional ID (name) for this counter
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117 :type id: str
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118
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119 :param domain_name: Optional domain name to use, by default we get this out of the
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120 environment configuration
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121 :type domain_name:str
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122
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123 :param fnc: Optional function to use for the incrementation, by default we just increment by one
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124 There are several functions defined in this module.
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125 Your function must accept "None" to get the initial value
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126 :type fnc: function, str
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127
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128 :param init_val: Initial value, by default this is the first element in your sequence,
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129 but you can pass in any value, even a string if you pass in a function that uses
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130 strings instead of ints to increment
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131 """
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132 self._db = None
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133 self._value = None
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134 self.last_value = None
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135 self.domain_name = domain_name
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136 self.id = id
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137 if init_val is None:
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138 init_val = fnc(init_val)
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139
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140 if self.id is None:
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141 import uuid
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142 self.id = str(uuid.uuid4())
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143
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144 self.item_type = type(fnc(None))
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145 self.timestamp = None
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146 # Allow us to pass in a full name to a function
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147 if isinstance(fnc, six.string_types):
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148 from boto.utils import find_class
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149 fnc = find_class(fnc)
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150 self.fnc = fnc
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151
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152 # Bootstrap the value last
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153 if not self.val:
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154 self.val = init_val
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155
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156 def set(self, val):
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157 """Set the value"""
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158 import time
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159 now = time.time()
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160 expected_value = []
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161 new_val = {}
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162 new_val['timestamp'] = now
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163 if self._value is not None:
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164 new_val['last_value'] = self._value
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165 expected_value = ['current_value', str(self._value)]
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166 new_val['current_value'] = val
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167 try:
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168 self.db.put_attributes(self.id, new_val, expected_value=expected_value)
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169 self.timestamp = new_val['timestamp']
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170 except SDBResponseError as e:
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171 if e.status == 409:
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172 raise ValueError("Sequence out of sync")
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173 else:
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174 raise
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175
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176
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177 def get(self):
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178 """Get the value"""
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179 val = self.db.get_attributes(self.id, consistent_read=True)
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180 if val:
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181 if 'timestamp' in val:
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182 self.timestamp = val['timestamp']
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183 if 'current_value' in val:
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184 self._value = self.item_type(val['current_value'])
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185 if "last_value" in val and val['last_value'] is not None:
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186 self.last_value = self.item_type(val['last_value'])
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187 return self._value
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188
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189 val = property(get, set)
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190
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191 def __repr__(self):
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192 return "%s('%s', '%s', '%s.%s', '%s')" % (
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193 self.__class__.__name__,
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194 self.id,
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195 self.domain_name,
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196 self.fnc.__module__, self.fnc.__name__,
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197 self.val)
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198
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199
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200 def _connect(self):
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201 """Connect to our domain"""
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202 if not self._db:
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203 import boto
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204 sdb = boto.connect_sdb()
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205 if not self.domain_name:
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206 self.domain_name = boto.config.get("DB", "sequence_db", boto.config.get("DB", "db_name", "default"))
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207 try:
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208 self._db = sdb.get_domain(self.domain_name)
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209 except SDBResponseError as e:
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210 if e.status == 400:
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211 self._db = sdb.create_domain(self.domain_name)
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212 else:
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213 raise
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214 return self._db
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215
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216 db = property(_connect)
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217
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218 def next(self):
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219 self.val = self.fnc(self.val, self.last_value)
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220 return self.val
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221
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222 def delete(self):
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223 """Remove this sequence"""
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224 self.db.delete_attributes(self.id)