Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/boto/dynamodb/layer1.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) 2012 Mitch Garnaat http://garnaat.org/
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2 # Copyright (c) 2012 Amazon.com, Inc. or its affiliates. All Rights Reserved
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3 #
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4 # Permission is hereby granted, free of charge, to any person obtaining a
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5 # copy of this software and associated documentation files (the
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6 # "Software"), to deal in the Software without restriction, including
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7 # without limitation the rights to use, copy, modify, merge, publish, dis-
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8 # tribute, sublicense, and/or sell copies of the Software, and to permit
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9 # persons to whom the Software is furnished to do so, subject to the fol-
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10 # lowing conditions:
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11 #
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12 # The above copyright notice and this permission notice shall be included
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13 # in all copies or substantial portions of the Software.
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14 #
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15 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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16 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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17 # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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18 # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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19 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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20 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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21 # IN THE SOFTWARE.
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22 #
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23 import time
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24 from binascii import crc32
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25
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26 import boto
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27 from boto.connection import AWSAuthConnection
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28 from boto.exception import DynamoDBResponseError
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29 from boto.provider import Provider
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30 from boto.dynamodb import exceptions as dynamodb_exceptions
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31 from boto.compat import json
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32
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33
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34 class Layer1(AWSAuthConnection):
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35 """
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36 This is the lowest-level interface to DynamoDB. Methods at this
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37 layer map directly to API requests and parameters to the methods
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38 are either simple, scalar values or they are the Python equivalent
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39 of the JSON input as defined in the DynamoDB Developer's Guide.
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40 All responses are direct decoding of the JSON response bodies to
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41 Python data structures via the json or simplejson modules.
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42
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43 :ivar throughput_exceeded_events: An integer variable that
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44 keeps a running total of the number of ThroughputExceeded
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45 responses this connection has received from Amazon DynamoDB.
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46 """
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47
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48 DefaultRegionName = 'us-east-1'
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49 """The default region name for DynamoDB API."""
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50
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51 ServiceName = 'DynamoDB'
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52 """The name of the Service"""
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53
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54 Version = '20111205'
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55 """DynamoDB API version."""
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56
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57 ThruputError = "ProvisionedThroughputExceededException"
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58 """The error response returned when provisioned throughput is exceeded"""
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59
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60 SessionExpiredError = 'com.amazon.coral.service#ExpiredTokenException'
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61 """The error response returned when session token has expired"""
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62
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63 ConditionalCheckFailedError = 'ConditionalCheckFailedException'
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64 """The error response returned when a conditional check fails"""
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65
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66 ValidationError = 'ValidationException'
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67 """The error response returned when an item is invalid in some way"""
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68
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69 ResponseError = DynamoDBResponseError
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70
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71 NumberRetries = 10
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72 """The number of times an error is retried."""
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73
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74 def __init__(self, aws_access_key_id=None, aws_secret_access_key=None,
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75 is_secure=True, port=None, proxy=None, proxy_port=None,
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76 debug=0, security_token=None, region=None,
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77 validate_certs=True, validate_checksums=True, profile_name=None):
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78 if not region:
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79 region_name = boto.config.get('DynamoDB', 'region',
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80 self.DefaultRegionName)
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81 for reg in boto.dynamodb.regions():
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82 if reg.name == region_name:
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83 region = reg
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84 break
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85
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86 self.region = region
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87 super(Layer1, self).__init__(self.region.endpoint,
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88 aws_access_key_id,
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89 aws_secret_access_key,
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90 is_secure, port, proxy, proxy_port,
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91 debug=debug, security_token=security_token,
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92 validate_certs=validate_certs,
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93 profile_name=profile_name)
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94 self.throughput_exceeded_events = 0
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95 self._validate_checksums = boto.config.getbool(
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96 'DynamoDB', 'validate_checksums', validate_checksums)
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97
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98 def _get_session_token(self):
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99 self.provider = Provider(self._provider_type)
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100 self._auth_handler.update_provider(self.provider)
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101
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102 def _required_auth_capability(self):
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103 return ['hmac-v4']
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104
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105 def make_request(self, action, body='', object_hook=None):
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106 """
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107 :raises: ``DynamoDBExpiredTokenError`` if the security token expires.
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108 """
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109 headers = {'X-Amz-Target': '%s_%s.%s' % (self.ServiceName,
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110 self.Version, action),
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111 'Host': self.region.endpoint,
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112 'Content-Type': 'application/x-amz-json-1.0',
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113 'Content-Length': str(len(body))}
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114 http_request = self.build_base_http_request('POST', '/', '/',
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115 {}, headers, body, None)
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116 start = time.time()
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117 response = self._mexe(http_request, sender=None,
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118 override_num_retries=self.NumberRetries,
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119 retry_handler=self._retry_handler)
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120 elapsed = (time.time() - start) * 1000
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121 request_id = response.getheader('x-amzn-RequestId')
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122 boto.log.debug('RequestId: %s' % request_id)
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123 boto.perflog.debug('%s: id=%s time=%sms',
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124 headers['X-Amz-Target'], request_id, int(elapsed))
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125 response_body = response.read().decode('utf-8')
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126 boto.log.debug(response_body)
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127 return json.loads(response_body, object_hook=object_hook)
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128
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129 def _retry_handler(self, response, i, next_sleep):
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130 status = None
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131 if response.status == 400:
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132 response_body = response.read().decode('utf-8')
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133 boto.log.debug(response_body)
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134 data = json.loads(response_body)
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135 if self.ThruputError in data.get('__type'):
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136 self.throughput_exceeded_events += 1
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137 msg = "%s, retry attempt %s" % (self.ThruputError, i)
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138 next_sleep = self._exponential_time(i)
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139 i += 1
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140 status = (msg, i, next_sleep)
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141 if i == self.NumberRetries:
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142 # If this was our last retry attempt, raise
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143 # a specific error saying that the throughput
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144 # was exceeded.
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145 raise dynamodb_exceptions.DynamoDBThroughputExceededError(
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146 response.status, response.reason, data)
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147 elif self.SessionExpiredError in data.get('__type'):
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148 msg = 'Renewing Session Token'
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149 self._get_session_token()
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150 status = (msg, i + self.num_retries - 1, 0)
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151 elif self.ConditionalCheckFailedError in data.get('__type'):
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152 raise dynamodb_exceptions.DynamoDBConditionalCheckFailedError(
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153 response.status, response.reason, data)
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154 elif self.ValidationError in data.get('__type'):
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155 raise dynamodb_exceptions.DynamoDBValidationError(
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156 response.status, response.reason, data)
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157 else:
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158 raise self.ResponseError(response.status, response.reason,
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159 data)
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160 expected_crc32 = response.getheader('x-amz-crc32')
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161 if self._validate_checksums and expected_crc32 is not None:
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162 boto.log.debug('Validating crc32 checksum for body: %s',
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163 response.read().decode('utf-8'))
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164 actual_crc32 = crc32(response.read()) & 0xffffffff
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165 expected_crc32 = int(expected_crc32)
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166 if actual_crc32 != expected_crc32:
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167 msg = ("The calculated checksum %s did not match the expected "
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168 "checksum %s" % (actual_crc32, expected_crc32))
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169 status = (msg, i + 1, self._exponential_time(i))
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170 return status
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171
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172 def _exponential_time(self, i):
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173 if i == 0:
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174 next_sleep = 0
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175 else:
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176 next_sleep = min(0.05 * (2 ** i),
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177 boto.config.get('Boto', 'max_retry_delay', 60))
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178 return next_sleep
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179
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180 def list_tables(self, limit=None, start_table=None):
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181 """
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182 Returns a dictionary of results. The dictionary contains
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183 a **TableNames** key whose value is a list of the table names.
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184 The dictionary could also contain a **LastEvaluatedTableName**
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185 key whose value would be the last table name returned if
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186 the complete list of table names was not returned. This
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187 value would then be passed as the ``start_table`` parameter on
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188 a subsequent call to this method.
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189
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190 :type limit: int
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191 :param limit: The maximum number of tables to return.
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192
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193 :type start_table: str
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194 :param start_table: The name of the table that starts the
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195 list. If you ran a previous list_tables and not
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196 all results were returned, the response dict would
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197 include a LastEvaluatedTableName attribute. Use
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198 that value here to continue the listing.
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199 """
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200 data = {}
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201 if limit:
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202 data['Limit'] = limit
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203 if start_table:
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204 data['ExclusiveStartTableName'] = start_table
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205 json_input = json.dumps(data)
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206 return self.make_request('ListTables', json_input)
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207
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208 def describe_table(self, table_name):
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209 """
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210 Returns information about the table including current
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211 state of the table, primary key schema and when the
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212 table was created.
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213
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214 :type table_name: str
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215 :param table_name: The name of the table to describe.
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216 """
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217 data = {'TableName': table_name}
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218 json_input = json.dumps(data)
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219 return self.make_request('DescribeTable', json_input)
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220
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221 def create_table(self, table_name, schema, provisioned_throughput):
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222 """
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223 Add a new table to your account. The table name must be unique
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224 among those associated with the account issuing the request.
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225 This request triggers an asynchronous workflow to begin creating
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226 the table. When the workflow is complete, the state of the
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227 table will be ACTIVE.
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228
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229 :type table_name: str
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230 :param table_name: The name of the table to create.
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231
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232 :type schema: dict
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233 :param schema: A Python version of the KeySchema data structure
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234 as defined by DynamoDB
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235
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236 :type provisioned_throughput: dict
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237 :param provisioned_throughput: A Python version of the
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238 ProvisionedThroughput data structure defined by
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239 DynamoDB.
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240 """
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241 data = {'TableName': table_name,
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242 'KeySchema': schema,
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243 'ProvisionedThroughput': provisioned_throughput}
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244 json_input = json.dumps(data)
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245 response_dict = self.make_request('CreateTable', json_input)
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246 return response_dict
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247
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248 def update_table(self, table_name, provisioned_throughput):
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249 """
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250 Updates the provisioned throughput for a given table.
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251
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252 :type table_name: str
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253 :param table_name: The name of the table to update.
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254
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255 :type provisioned_throughput: dict
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256 :param provisioned_throughput: A Python version of the
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257 ProvisionedThroughput data structure defined by
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258 DynamoDB.
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259 """
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260 data = {'TableName': table_name,
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261 'ProvisionedThroughput': provisioned_throughput}
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262 json_input = json.dumps(data)
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263 return self.make_request('UpdateTable', json_input)
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264
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265 def delete_table(self, table_name):
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266 """
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267 Deletes the table and all of it's data. After this request
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268 the table will be in the DELETING state until DynamoDB
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269 completes the delete operation.
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270
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271 :type table_name: str
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272 :param table_name: The name of the table to delete.
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273 """
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274 data = {'TableName': table_name}
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275 json_input = json.dumps(data)
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276 return self.make_request('DeleteTable', json_input)
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277
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278 def get_item(self, table_name, key, attributes_to_get=None,
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279 consistent_read=False, object_hook=None):
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280 """
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281 Return a set of attributes for an item that matches
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282 the supplied key.
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283
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284 :type table_name: str
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285 :param table_name: The name of the table containing the item.
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286
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287 :type key: dict
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288 :param key: A Python version of the Key data structure
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289 defined by DynamoDB.
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290
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291 :type attributes_to_get: list
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292 :param attributes_to_get: A list of attribute names.
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293 If supplied, only the specified attribute names will
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294 be returned. Otherwise, all attributes will be returned.
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295
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296 :type consistent_read: bool
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297 :param consistent_read: If True, a consistent read
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298 request is issued. Otherwise, an eventually consistent
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299 request is issued.
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300 """
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301 data = {'TableName': table_name,
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302 'Key': key}
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303 if attributes_to_get:
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304 data['AttributesToGet'] = attributes_to_get
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305 if consistent_read:
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306 data['ConsistentRead'] = True
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307 json_input = json.dumps(data)
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308 response = self.make_request('GetItem', json_input,
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309 object_hook=object_hook)
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310 if 'Item' not in response:
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311 raise dynamodb_exceptions.DynamoDBKeyNotFoundError(
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312 "Key does not exist."
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313 )
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314 return response
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315
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316 def batch_get_item(self, request_items, object_hook=None):
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317 """
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318 Return a set of attributes for a multiple items in
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319 multiple tables using their primary keys.
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320
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321 :type request_items: dict
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322 :param request_items: A Python version of the RequestItems
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323 data structure defined by DynamoDB.
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324 """
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325 # If the list is empty, return empty response
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326 if not request_items:
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327 return {}
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328 data = {'RequestItems': request_items}
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329 json_input = json.dumps(data)
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330 return self.make_request('BatchGetItem', json_input,
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331 object_hook=object_hook)
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332
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333 def batch_write_item(self, request_items, object_hook=None):
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334 """
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335 This operation enables you to put or delete several items
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336 across multiple tables in a single API call.
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337
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338 :type request_items: dict
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339 :param request_items: A Python version of the RequestItems
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340 data structure defined by DynamoDB.
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341 """
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342 data = {'RequestItems': request_items}
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343 json_input = json.dumps(data)
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344 return self.make_request('BatchWriteItem', json_input,
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345 object_hook=object_hook)
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346
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347 def put_item(self, table_name, item,
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348 expected=None, return_values=None,
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349 object_hook=None):
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350 """
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351 Create a new item or replace an old item with a new
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352 item (including all attributes). If an item already
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353 exists in the specified table with the same primary
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354 key, the new item will completely replace the old item.
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355 You can perform a conditional put by specifying an
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356 expected rule.
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357
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358 :type table_name: str
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359 :param table_name: The name of the table in which to put the item.
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360
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361 :type item: dict
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362 :param item: A Python version of the Item data structure
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363 defined by DynamoDB.
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364
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365 :type expected: dict
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366 :param expected: A Python version of the Expected
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367 data structure defined by DynamoDB.
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368
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369 :type return_values: str
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370 :param return_values: Controls the return of attribute
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371 name-value pairs before then were changed. Possible
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372 values are: None or 'ALL_OLD'. If 'ALL_OLD' is
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373 specified and the item is overwritten, the content
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374 of the old item is returned.
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375 """
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376 data = {'TableName': table_name,
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377 'Item': item}
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378 if expected:
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379 data['Expected'] = expected
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380 if return_values:
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381 data['ReturnValues'] = return_values
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382 json_input = json.dumps(data)
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383 return self.make_request('PutItem', json_input,
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384 object_hook=object_hook)
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385
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386 def update_item(self, table_name, key, attribute_updates,
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387 expected=None, return_values=None,
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388 object_hook=None):
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389 """
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390 Edits an existing item's attributes. You can perform a conditional
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391 update (insert a new attribute name-value pair if it doesn't exist,
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392 or replace an existing name-value pair if it has certain expected
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393 attribute values).
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394
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395 :type table_name: str
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396 :param table_name: The name of the table.
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397
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398 :type key: dict
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399 :param key: A Python version of the Key data structure
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400 defined by DynamoDB which identifies the item to be updated.
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401
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402 :type attribute_updates: dict
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403 :param attribute_updates: A Python version of the AttributeUpdates
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404 data structure defined by DynamoDB.
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405
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406 :type expected: dict
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407 :param expected: A Python version of the Expected
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408 data structure defined by DynamoDB.
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409
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410 :type return_values: str
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411 :param return_values: Controls the return of attribute
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412 name-value pairs before then were changed. Possible
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413 values are: None or 'ALL_OLD'. If 'ALL_OLD' is
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414 specified and the item is overwritten, the content
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415 of the old item is returned.
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416 """
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417 data = {'TableName': table_name,
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418 'Key': key,
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419 'AttributeUpdates': attribute_updates}
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420 if expected:
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421 data['Expected'] = expected
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422 if return_values:
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423 data['ReturnValues'] = return_values
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424 json_input = json.dumps(data)
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425 return self.make_request('UpdateItem', json_input,
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426 object_hook=object_hook)
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427
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428 def delete_item(self, table_name, key,
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429 expected=None, return_values=None,
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430 object_hook=None):
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431 """
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432 Delete an item and all of it's attributes by primary key.
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433 You can perform a conditional delete by specifying an
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434 expected rule.
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435
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436 :type table_name: str
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437 :param table_name: The name of the table containing the item.
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438
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439 :type key: dict
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440 :param key: A Python version of the Key data structure
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441 defined by DynamoDB.
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442
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443 :type expected: dict
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444 :param expected: A Python version of the Expected
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445 data structure defined by DynamoDB.
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446
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447 :type return_values: str
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448 :param return_values: Controls the return of attribute
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449 name-value pairs before then were changed. Possible
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450 values are: None or 'ALL_OLD'. If 'ALL_OLD' is
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451 specified and the item is overwritten, the content
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452 of the old item is returned.
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453 """
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454 data = {'TableName': table_name,
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455 'Key': key}
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456 if expected:
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457 data['Expected'] = expected
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458 if return_values:
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459 data['ReturnValues'] = return_values
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460 json_input = json.dumps(data)
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461 return self.make_request('DeleteItem', json_input,
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462 object_hook=object_hook)
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463
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464 def query(self, table_name, hash_key_value, range_key_conditions=None,
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465 attributes_to_get=None, limit=None, consistent_read=False,
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466 scan_index_forward=True, exclusive_start_key=None,
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467 object_hook=None, count=False):
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468 """
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469 Perform a query of DynamoDB. This version is currently punting
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470 and expecting you to provide a full and correct JSON body
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471 which is passed as is to DynamoDB.
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472
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473 :type table_name: str
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474 :param table_name: The name of the table to query.
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475
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476 :type hash_key_value: dict
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477 :param key: A DynamoDB-style HashKeyValue.
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478
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479 :type range_key_conditions: dict
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480 :param range_key_conditions: A Python version of the
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481 RangeKeyConditions data structure.
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482
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483 :type attributes_to_get: list
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484 :param attributes_to_get: A list of attribute names.
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485 If supplied, only the specified attribute names will
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486 be returned. Otherwise, all attributes will be returned.
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487
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488 :type limit: int
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489 :param limit: The maximum number of items to return.
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490
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491 :type count: bool
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492 :param count: If True, Amazon DynamoDB returns a total
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493 number of items for the Query operation, even if the
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494 operation has no matching items for the assigned filter.
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495
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496 :type consistent_read: bool
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497 :param consistent_read: If True, a consistent read
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498 request is issued. Otherwise, an eventually consistent
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499 request is issued.
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500
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501 :type scan_index_forward: bool
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502 :param scan_index_forward: Specified forward or backward
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503 traversal of the index. Default is forward (True).
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504
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505 :type exclusive_start_key: list or tuple
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506 :param exclusive_start_key: Primary key of the item from
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507 which to continue an earlier query. This would be
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508 provided as the LastEvaluatedKey in that query.
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509 """
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510 data = {'TableName': table_name,
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511 'HashKeyValue': hash_key_value}
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512 if range_key_conditions:
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513 data['RangeKeyCondition'] = range_key_conditions
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514 if attributes_to_get:
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515 data['AttributesToGet'] = attributes_to_get
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516 if limit:
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517 data['Limit'] = limit
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518 if count:
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519 data['Count'] = True
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520 if consistent_read:
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521 data['ConsistentRead'] = True
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522 if scan_index_forward:
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523 data['ScanIndexForward'] = True
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524 else:
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525 data['ScanIndexForward'] = False
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526 if exclusive_start_key:
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527 data['ExclusiveStartKey'] = exclusive_start_key
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528 json_input = json.dumps(data)
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529 return self.make_request('Query', json_input,
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530 object_hook=object_hook)
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531
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532 def scan(self, table_name, scan_filter=None,
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533 attributes_to_get=None, limit=None,
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534 exclusive_start_key=None, object_hook=None, count=False):
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535 """
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536 Perform a scan of DynamoDB. This version is currently punting
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537 and expecting you to provide a full and correct JSON body
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538 which is passed as is to DynamoDB.
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539
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540 :type table_name: str
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541 :param table_name: The name of the table to scan.
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542
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543 :type scan_filter: dict
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544 :param scan_filter: A Python version of the
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545 ScanFilter data structure.
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546
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547 :type attributes_to_get: list
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548 :param attributes_to_get: A list of attribute names.
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549 If supplied, only the specified attribute names will
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550 be returned. Otherwise, all attributes will be returned.
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551
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552 :type limit: int
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553 :param limit: The maximum number of items to evaluate.
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554
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555 :type count: bool
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556 :param count: If True, Amazon DynamoDB returns a total
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557 number of items for the Scan operation, even if the
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558 operation has no matching items for the assigned filter.
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559
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560 :type exclusive_start_key: list or tuple
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561 :param exclusive_start_key: Primary key of the item from
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562 which to continue an earlier query. This would be
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563 provided as the LastEvaluatedKey in that query.
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564 """
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565 data = {'TableName': table_name}
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566 if scan_filter:
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567 data['ScanFilter'] = scan_filter
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568 if attributes_to_get:
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569 data['AttributesToGet'] = attributes_to_get
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570 if limit:
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571 data['Limit'] = limit
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572 if count:
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573 data['Count'] = True
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574 if exclusive_start_key:
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575 data['ExclusiveStartKey'] = exclusive_start_key
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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576 json_input = json.dumps(data)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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577 return self.make_request('Scan', json_input, object_hook=object_hook)