How to use dynamodb_client method in localstack

Best Python code snippet using localstack_python

server_monitor_context.py

Source:server_monitor_context.py

1"""2Module providing access to the Server Monitor data3"""4import boto35from botocore.exceptions import ClientError6import time7class ServerMonitorContext:8    """9    Context used to access the server monitor data in the DB10    """11    def __init__(self):12        """13        Initializes a new instance of the L{ServerMonitorContext} class 14        """15        self.table_name = 'servers'16        self.dynamodb_client = boto3.client('dynamodb', region_name='eu-central-1', endpoint_url="http://192.168.2.159:8000")17        try:18            self.dynamodb_client.describe_table(19                TableName = self.table_name)20        except ClientError as ce:21            if ce.response['Error']['Code'] == 'ResourceNotFoundException':22                self._initializeDb()23            else:24                raise25    26    def get_server(self, serverId):27        """28        Gets a server by its serverId29        """30        server = self.dynamodb_client.get_item(31            TableName=self.table_name,32            Key={33                'server_id':{34                    'S': serverId35                }36            }37        )38        ret = None39        if 'Item' in server:            40            ret = self._unbox_record(server['Item'])41        42        return ret43    44    def list_servers(self):45        """46        Gets a list of the servers in the DB47        """48        servers = self.dynamodb_client.scan(49            TableName=self.table_name)50        unboxed_servers = []51        for server in servers['Items']:52            unboxed_servers.append(self._unbox_record(server))53        return unboxed_servers54    def delete_server(self, serverId):55        """56        Deletes a server from the DB57        """58        response = self.dynamodb_client.delete_item(59            TableName=self.table_name,60            Key={61                'server_id':{62                    'S': serverId63                },64            },65            ReturnValues='ALL_OLD'66        )67        68        ret = False69        if 'Attributes' in response:70            ret = True71        return ret72    def add_server(self, serverData):73        """74        Adds a server to the DB75        """76        server = self._box_record(serverData)77        ret = True78        try:79            self.dynamodb_client.put_item(80                TableName=self.table_name,81                Item=server,82                ConditionExpression='attribute_not_exists(server_id)'83            )84        except ClientError as err:85            if err.response['Error']['Code'] == 'ConditionalCheckFailedException':86                ret = False87            else:88                raise89        return ret90    def update_server(self, serverData):91        """92        Updates the given server in the DB93        """94        server = self._box_record(serverData)95        ret = True96        try:97            self.dynamodb_client.put_item(98                TableName=self.table_name,99                Item=server,100                ConditionExpression='attribute_exists(server_id)'101            )102        except ClientError as err:103            if err.response['Error']['Code'] == 'ConditionalCheckFailedException':104                ret = False105            else:106                raise107                108        return ret109    def _box_record(self, record):110        """111        Encapsulates a record as DynamoDB is expecting it112        """113        for key in record.keys():114            if isinstance(record[key], int) or isinstance(record[key], float):115                record[key] = {'N': str(record[key])}116            else :117                record[key] = {'S': str(record[key])}118        print('Boxed record: ' + str(record))119        return record120    def _unbox_record(self, record):121        """122        Extracts a record from the DynamoDB encapsulation123        """124        for key in record.keys():125            if 'S' in record[key]:126                record[key] = record[key]['S']127            elif 'N' in record[key]:128                if '.' in record[key]['N']:129                    record[key] = float(record[key]['N'])130                else:131                    record[key] = int(record[key]['N'])132            else:133                record[key] = 'unsupported type ' + record[key].keys()[0]134        return record135    136    def _initializeDb(self):137        """138        Initializes the DB creating the table and some test data139        """140        print('Database not initialized. Initializing DB...')141        self.dynamodb_client.create_table(142            AttributeDefinitions = [143                {144                    'AttributeName': 'server_id',145                    'AttributeType': 'S'146                }147            ],148            TableName=self.table_name,149            KeySchema=[150                {151                    'AttributeName': 'server_id',152                    'KeyType': 'HASH'153                }154            ],            155            ProvisionedThroughput={156                'ReadCapacityUnits': 5,157                'WriteCapacityUnits': 5,158            }159        )160        initialized = False161        while not(initialized):162            time.sleep(0.5)163            table_desc = self.dynamodb_client.describe_table(164                TableName = self.table_name)165            initialized = table_desc['Table']['TableStatus'] == 'ACTIVE'166        # Insert some test data167        self.dynamodb_client.batch_write_item(168            RequestItems={169                self.table_name : [170                    {171                        'PutRequest': {172                            'Item': {173                                'server_id': {174                                    'S': 'VillaconejosSQLServer01'175                                },176                                'memory': {177                                    'N': '8589934592'178                                },179                                'iisPresent': {180                                    'S': 'false'181                                }182                            }183                        }184                    },185                    {186                        'PutRequest': {187                            'Item': {188                                'server_id': {189                                    'S': 'VillaconejosSQLServer02'190                                },191                                'memory': {192                                    'N': '8589934592'193                                },194                                'iisPresent': {195                                    'S': 'false'196                                }197                            }198                        }199                    },200                    {201                        'PutRequest': {202                            'Item': {203                                'server_id': {204                                    'S': 'VillaconejosBOSServer01'205                                },206                                'memory': {207                                    'N': '1073741824'208                                },209                                'iisPresent': {210                                    'S': 'true'211                                }212                            }213                        }214                    }215                ]216            }217        )218        print('Database initialized')219# Test it!...

test_class_ddb.py

Source:test_class_ddb.py

1from contextlib import contextmanager2from aws_dynamodb import AWSDynamoDB3@contextmanager4def ddb_table_setup(dynamodb_client):5    dynamodb_client.create_table(6            TableName="Table",7            KeySchema=[8                {9                    'AttributeName': 'key',10                    'KeyType': 'HASH'11                },12                {13                    'AttributeName': 'sort',14                    'KeyType': 'RANGE'15                },16            ],17            AttributeDefinitions=[18                {19                    'AttributeName': 'key',20                    'AttributeType': 'S'21                },22                {23                    'AttributeName': 'sort',24                    'AttributeType': 'S'25                },26            ],27            ProvisionedThroughput={28                'ReadCapacityUnits': 5,29                'WriteCapacityUnits': 530            }31        )32    yield33    table = dynamodb_client.Table("Table")34    table.delete()35@contextmanager36def ddb_table_with_previous_data(dynamodb_client):37    dynamodb_client.create_table(38            TableName="Table",39            KeySchema=[40                {41                    'AttributeName': 'key',42                    'KeyType': 'HASH'43                },44                {45                    'AttributeName': 'sort',46                    'KeyType': 'RANGE'47                },48            ],49            AttributeDefinitions=[50                {51                    'AttributeName': 'key',52                    'AttributeType': 'S'53                },54                {55                    'AttributeName': 'sort',56                    'AttributeType': 'S'57                },58            ],59            ProvisionedThroughput={60                'ReadCapacityUnits': 5,61                'WriteCapacityUnits': 562            }63        )64    table = dynamodb_client.Table("Table")65    table.put_item(Item={66        "key": "key",67        "sort": "sort",68        "data": {}69    })70    yield71    table.delete_item(72        Key={73            "key": "key",74            "sort": ""75        }76    )77    table.delete()78class TestClassDDB:79    def test_table_exist(self, dynamodb_client):80        with ddb_table_setup(dynamodb_client):81            client = AWSDynamoDB()82            client.set_table_name("Table")83            expected = client.table_exist()84            assert expected is True85    def test_table_not_exist(self, dynamodb_client):86        with ddb_table_setup(dynamodb_client):87            client = AWSDynamoDB()88            client.set_table_name("no existing table")89            expected = client.table_exist()90            assert expected is False91    def test_put_item_success(self, dynamodb_client):92        with ddb_table_setup(dynamodb_client):93            data_input = {94                "key": "key_1",95                "sort": "range_1",96                "some_extra_data": "extra_data"97            }98            client = AWSDynamoDB()99            client.set_table_name("Table")100            expected = client.put_item(data_input)101            assert expected == {102                "status": "success",103                "item": data_input104            }105    def test_put_item_fail(self, dynamodb_client):106        with ddb_table_setup(dynamodb_client):107            data_input = {108                "fail_schema": "no data schema"109            }110            client = AWSDynamoDB()111            client.set_table_name("Table")112            expected = client.put_item(data_input)113            assert expected == {114                'status': 'error',115                'message_error': (116                    'An error occurred (ValidationException)'117                    ' when calling the PutItem operation:'118                    ' One or more parameter values were invalid:'119                    ' Missing the key key in the item'120                )121            }122    def test_get_item_success_item_found(self, dynamodb_client):123        with ddb_table_with_previous_data(dynamodb_client):124            client = AWSDynamoDB()125            client.set_table_name("Table")126            expected = client.get_item({"key": "key", "sort": "sort"})127            assert expected == {128                'item': {129                    'data': {},130                    'key': 'key',131                    'sort': 'sort'132                },133                'status': 'success'134            }135    def test_get_item_success_item_not_found(self, dynamodb_client):136        with ddb_table_with_previous_data(dynamodb_client):137            client = AWSDynamoDB()138            client.set_table_name("Table")139            expected = client.get_item({"key": "key", "sort": ""})140            assert expected == {'item': {}, 'status': 'success'}141    def test_get_item_fail(self, dynamodb_client):142        with ddb_table_with_previous_data(dynamodb_client):143            client = AWSDynamoDB()144            client.set_table_name("Table")145            expected = client.get_item({"bad schema": "no value"})146            assert expected == {147                'status': 'error',148                'message_error': (149                    'An error occurred (ValidationException)'150                    ' when calling the GetItem operation:'151                    ' Validation Exception'152                )...

cache.py

Source:cache.py

1import boto32dynamodb_client = boto3.resource('dynamodb', region_name='us-east-2')3kinesis_client = boto3.client('kinesis', region_name='us-east-2')4KINESIS_STREAM_NAME = None5PAYWALLS = dynamodb_client.Table('PaywallBotPaywall').scan()['Items']6EMOJIS = dynamodb_client.Table('PaywallBotEmoji').scan()['Items']7REPLIES = dynamodb_client.Table('PaywallBotReply').scan()['Items']...

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