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How to use has_event_sources_or_streams_enabled method in localstack

Best Python code snippet using localstack_python
provider.py
Source:provider.py
...452    @handler("PutItem", expand=False)453    def put_item(self, context: RequestContext, put_item_input: PutItemInput) -> PutItemOutput:454        existing_item = None455        table_name = put_item_input["TableName"]456        event_sources_or_streams_enabled = has_event_sources_or_streams_enabled(table_name)457        if event_sources_or_streams_enabled:458            existing_item = ItemFinder.find_existing_item(put_item_input)459        # forward request to backend460        self.fix_return_consumed_capacity(put_item_input)461        result = self.forward_request(context, put_item_input)462        # Get stream specifications details for the table463        if event_sources_or_streams_enabled:464            stream_spec = dynamodb_get_table_stream_specification(table_name=table_name)465            item = put_item_input["Item"]466            # prepare record keys467            keys = SchemaExtractor.extract_keys(item=item, table_name=table_name)468            # create record469            record = self.get_record_template()470            record["eventName"] = "INSERT" if not existing_item else "MODIFY"471            record["dynamodb"].update(472                {473                    "Keys": keys,474                    "NewImage": item,475                    "SizeBytes": len(json.dumps(item)),476                }477            )478            if stream_spec:479                record["dynamodb"]["StreamViewType"] = stream_spec["StreamViewType"]480            if existing_item:481                record["dynamodb"]["OldImage"] = existing_item482            self.forward_stream_records([record], table_name=table_name)483        return result484    @handler("DeleteItem", expand=False)485    def delete_item(486        self,487        context: RequestContext,488        delete_item_input: DeleteItemInput,489    ) -> DeleteItemOutput:490        existing_item = None491        table_name = delete_item_input["TableName"]492        if has_event_sources_or_streams_enabled(table_name):493            existing_item = ItemFinder.find_existing_item(delete_item_input)494        # forward request to backend495        self.fix_return_consumed_capacity(delete_item_input)496        result = self.forward_request(context, delete_item_input)497        # determine and forward stream record498        if existing_item:499            event_sources_or_streams_enabled = has_event_sources_or_streams_enabled(table_name)500            if event_sources_or_streams_enabled:501                # create record502                record = self.get_record_template()503                record["eventName"] = "REMOVE"504                record["dynamodb"].update(505                    {506                        "Keys": delete_item_input["Key"],507                        "OldImage": existing_item,508                        "SizeBytes": len(json.dumps(existing_item)),509                    }510                )511                # Get stream specifications details for the table512                stream_spec = dynamodb_get_table_stream_specification(table_name=table_name)513                if stream_spec:514                    record["dynamodb"]["StreamViewType"] = stream_spec["StreamViewType"]515                self.forward_stream_records([record], table_name=table_name)516        return result517    @handler("UpdateItem", expand=False)518    def update_item(519        self,520        context: RequestContext,521        update_item_input: UpdateItemInput,522    ) -> UpdateItemOutput:523        existing_item = None524        table_name = update_item_input["TableName"]525        event_sources_or_streams_enabled = has_event_sources_or_streams_enabled(table_name)526        if event_sources_or_streams_enabled:527            existing_item = ItemFinder.find_existing_item(update_item_input)528        # forward request to backend529        self.fix_return_consumed_capacity(update_item_input)530        result = self.forward_request(context, update_item_input)531        # construct and forward stream record532        if event_sources_or_streams_enabled:533            updated_item = ItemFinder.find_existing_item(update_item_input)534            if updated_item:535                record = self.get_record_template()536                record["eventName"] = "INSERT" if not existing_item else "MODIFY"537                record["dynamodb"].update(538                    {539                        "Keys": update_item_input["Key"],540                        "NewImage": updated_item,541                        "SizeBytes": len(json.dumps(updated_item)),542                    }543                )544                if existing_item:545                    record["dynamodb"]["OldImage"] = existing_item546                stream_spec = dynamodb_get_table_stream_specification(table_name=table_name)547                if stream_spec:548                    record["dynamodb"]["StreamViewType"] = stream_spec["StreamViewType"]549                self.forward_stream_records([record], table_name=table_name)550        return result551    @handler("GetItem", expand=False)552    def get_item(self, context: RequestContext, get_item_input: GetItemInput) -> GetItemOutput:553        result = self.forward_request(context)554        self.fix_consumed_capacity(get_item_input, result)555        return result556    @handler("Query", expand=False)557    def query(self, context: RequestContext, query_input: QueryInput) -> QueryOutput:558        index_name = query_input.get("IndexName")559        if index_name:560            if not is_index_query_valid(query_input):561                raise ValidationException(562                    "One or more parameter values were invalid: Select type ALL_ATTRIBUTES "563                    "is not supported for global secondary index id-index because its projection "564                    "type is not ALL",565                )566        result = self.forward_request(context)567        self.fix_consumed_capacity(query_input, result)568        return result569    @handler("Scan", expand=False)570    def scan(self, context: RequestContext, scan_input: ScanInput) -> ScanOutput:571        return self.forward_request(context)572    @handler("BatchWriteItem", expand=False)573    def batch_write_item(574        self,575        context: RequestContext,576        batch_write_item_input: BatchWriteItemInput,577    ) -> BatchWriteItemOutput:578        existing_items = []579        unprocessed_put_items = []580        unprocessed_delete_items = []581        request_items = batch_write_item_input["RequestItems"]582        for table_name in sorted(request_items.keys()):583            for request in request_items[table_name]:584                for key in ["PutRequest", "DeleteRequest"]:585                    inner_request = request.get(key)586                    if inner_request:587                        if self.should_throttle("BatchWriteItem"):588                            if key == "PutRequest":589                                unprocessed_put_items.append(inner_request)590                            elif key == "DeleteRequest":591                                unprocessed_delete_items.append(inner_request)592                        else:593                            item = ItemFinder.find_existing_item(inner_request, table_name)594                            existing_items.append(item)595        # forward request to backend596        result = self.forward_request(context)597        # determine and forward stream records598        request_items = batch_write_item_input["RequestItems"]599        records, unprocessed_items = self.prepare_batch_write_item_records(600            request_items=request_items,601            unprocessed_put_items=unprocessed_put_items,602            unprocessed_delete_items=unprocessed_delete_items,603            existing_items=existing_items,604        )605        streams_enabled_cache = {}606        event_sources_or_streams_enabled = False607        for record in records:608            event_sources_or_streams_enabled = (609                event_sources_or_streams_enabled610                or has_event_sources_or_streams_enabled(611                    record["eventSourceARN"], streams_enabled_cache612                )613            )614        if event_sources_or_streams_enabled:615            self.forward_stream_records(records)616        # update response617        if any(unprocessed_items):618            table_name = list(request_items.keys())[0]619            unprocessed = result["UnprocessedItems"]620            if table_name not in unprocessed:621                unprocessed[table_name] = []622            for key in ["PutRequest", "DeleteRequest"]:623                if any(unprocessed_items[key]):624                    unprocessed_items[table_name].append({key: unprocessed_items[key]})625            for key in list(unprocessed.keys()):626                if not unprocessed.get(key):627                    del unprocessed[key]628        return result629    @handler("TransactWriteItems", expand=False)630    def transact_write_items(631        self,632        context: RequestContext,633        transact_write_items_input: TransactWriteItemsInput,634    ) -> TransactWriteItemsOutput:635        existing_items = []636        for item in transact_write_items_input["TransactItems"]:637            for key in ["Put", "Update", "Delete"]:638                inner_item = item.get(key)639                if inner_item:640                    existing_items.append(ItemFinder.find_existing_item(inner_item))641        # forward request to backend642        result = self.forward_request(context)643        # determine and forward stream records644        streams_enabled_cache = {}645        records = self.prepare_transact_write_item_records(646            transact_items=transact_write_items_input["TransactItems"],647            existing_items=existing_items,648        )649        event_sources_or_streams_enabled = False650        for record in records:651            event_sources_or_streams_enabled = (652                event_sources_or_streams_enabled653                or has_event_sources_or_streams_enabled(654                    record["eventSourceARN"], streams_enabled_cache655                )656            )657        if event_sources_or_streams_enabled:658            self.forward_stream_records(records)659        return result660    @handler("ExecuteStatement", expand=False)661    def execute_statement(662        self,663        context: RequestContext,664        execute_statement_input: ExecuteStatementInput,665    ) -> ExecuteStatementOutput:666        statement = execute_statement_input["Statement"]667        table_name = extract_table_name_from_partiql_update(statement)668        existing_items = None669        if table_name and has_event_sources_or_streams_enabled(table_name):670            # Note: fetching the entire list of items is hugely inefficient, especially for larger tables671            # TODO: find a mechanism to hook into the PartiQL update mechanism of DynamoDB Local directly!672            existing_items = ItemFinder.list_existing_items_for_statement(statement)673        # forward request to backend674        result = self.forward_request(context)675        # construct and forward stream record676        event_sources_or_streams_enabled = table_name and has_event_sources_or_streams_enabled(677            table_name678        )679        if event_sources_or_streams_enabled:680            records = get_updated_records(table_name, existing_items)681            self.forward_stream_records(records, table_name=table_name)682        return result683    def tag_resource(684        self, context: RequestContext, resource_arn: ResourceArnString, tags: TagList685    ) -> None:686        table_tags = DynamoDBRegion.TABLE_TAGS687        if resource_arn not in table_tags:688            table_tags[resource_arn] = {}689        table_tags[resource_arn].update({tag["Key"]: tag["Value"] for tag in tags})690    def untag_resource(691        self, context: RequestContext, resource_arn: ResourceArnString, tag_keys: TagKeyList692    ) -> None:693        for tag_key in tag_keys or []:694            DynamoDBRegion.TABLE_TAGS.get(resource_arn, {}).pop(tag_key, None)695    def list_tags_of_resource(696        self,697        context: RequestContext,698        resource_arn: ResourceArnString,699        next_token: NextTokenString = None,700    ) -> ListTagsOfResourceOutput:701        result = [702            {"Key": k, "Value": v}703            for k, v in DynamoDBRegion.TABLE_TAGS.get(resource_arn, {}).items()704        ]705        return ListTagsOfResourceOutput(Tags=result)706    def describe_time_to_live(707        self, context: RequestContext, table_name: TableName708    ) -> DescribeTimeToLiveOutput:709        backend = DynamoDBRegion.get()710        ttl_spec = backend.ttl_specifications.get(table_name)711        result = {"TimeToLiveStatus": "DISABLED"}712        if ttl_spec:713            if ttl_spec.get("Enabled"):714                ttl_status = "ENABLED"715            else:716                ttl_status = "DISABLED"717            result = {718                "AttributeName": ttl_spec.get("AttributeName"),719                "TimeToLiveStatus": ttl_status,720            }721        return DescribeTimeToLiveOutput(TimeToLiveDescription=result)722    def update_time_to_live(723        self,724        context: RequestContext,725        table_name: TableName,726        time_to_live_specification: TimeToLiveSpecification,727    ) -> UpdateTimeToLiveOutput:728        # TODO: TTL status is maintained/mocked but no real expiry is happening for items729        backend = DynamoDBRegion.get()730        backend.ttl_specifications[table_name] = time_to_live_specification731        return UpdateTimeToLiveOutput(TimeToLiveSpecification=time_to_live_specification)732    def create_global_table(733        self, context: RequestContext, global_table_name: TableName, replication_group: ReplicaList734    ) -> CreateGlobalTableOutput:735        if global_table_name in DynamoDBRegion.GLOBAL_TABLES:736            raise GlobalTableAlreadyExistsException("Global table with this name already exists")737        replication_group = [grp.copy() for grp in replication_group or []]738        data = {"GlobalTableName": global_table_name, "ReplicationGroup": replication_group}739        DynamoDBRegion.GLOBAL_TABLES[global_table_name] = data740        for group in replication_group:741            group["ReplicaStatus"] = "ACTIVE"742            group["ReplicaStatusDescription"] = "Replica active"743        return CreateGlobalTableOutput(GlobalTableDescription=data)744    def describe_global_table(745        self, context: RequestContext, global_table_name: TableName746    ) -> DescribeGlobalTableOutput:747        details = DynamoDBRegion.GLOBAL_TABLES.get(global_table_name)748        if not details:749            raise GlobalTableNotFoundException("Global table with this name does not exist")750        return DescribeGlobalTableOutput(GlobalTableDescription=details)751    def list_global_tables(752        self,753        context: RequestContext,754        exclusive_start_global_table_name: TableName = None,755        limit: PositiveIntegerObject = None,756        region_name: RegionName = None,757    ) -> ListGlobalTablesOutput:758        # TODO: add paging support759        result = [760            select_attributes(tab, ["GlobalTableName", "ReplicationGroup"])761            for tab in DynamoDBRegion.GLOBAL_TABLES.values()762        ]763        return ListGlobalTablesOutput(GlobalTables=result)764    def update_global_table(765        self,766        context: RequestContext,767        global_table_name: TableName,768        replica_updates: ReplicaUpdateList,769    ) -> UpdateGlobalTableOutput:770        details = DynamoDBRegion.GLOBAL_TABLES.get(global_table_name)771        if not details:772            raise GlobalTableNotFoundException("Global table with this name does not exist")773        for update in replica_updates or []:774            repl_group = details["ReplicationGroup"]775            # delete existing776            delete = update.get("Delete")777            if delete:778                details["ReplicationGroup"] = [779                    g for g in repl_group if g["RegionName"] != delete["RegionName"]780                ]781            # create new782            create = update.get("Create")783            if create:784                exists = [g for g in repl_group if g["RegionName"] == create["RegionName"]]785                if exists:786                    continue787                new_group = {788                    "RegionName": create["RegionName"],789                    "ReplicaStatus": "ACTIVE",790                    "ReplicaStatusDescription": "Replica active",791                }792                details["ReplicationGroup"].append(new_group)793        return UpdateGlobalTableOutput(GlobalTableDescription=details)794    def enable_kinesis_streaming_destination(795        self, context: RequestContext, table_name: TableName, stream_arn: StreamArn796    ) -> KinesisStreamingDestinationOutput:797        # Check if table exists, to avoid error log output from DynamoDBLocal798        if not self.table_exists(table_name):799            raise ResourceNotFoundException("Cannot do operations on a non-existent table")800        stream = EventForwarder.is_kinesis_stream_exists(stream_arn=stream_arn)801        if not stream:802            raise ValidationException("User does not have a permission to use kinesis stream")803        table_def = DynamoDBRegion.get().table_definitions.setdefault(table_name, {})804        dest_status = table_def.get("KinesisDataStreamDestinationStatus")805        if dest_status not in ["DISABLED", "ENABLE_FAILED", None]:806            raise ValidationException(807                "Table is not in a valid state to enable Kinesis Streaming "808                "Destination:EnableKinesisStreamingDestination must be DISABLED or ENABLE_FAILED "809                "to perform ENABLE operation."810            )811        table_def["KinesisDataStreamDestinations"] = (812            table_def.get("KinesisDataStreamDestinations") or []813        )814        # remove the stream destination if already present815        table_def["KinesisDataStreamDestinations"] = [816            t for t in table_def["KinesisDataStreamDestinations"] if t["StreamArn"] != stream_arn817        ]818        # append the active stream destination at the end of the list819        table_def["KinesisDataStreamDestinations"].append(820            {821                "DestinationStatus": "ACTIVE",822                "DestinationStatusDescription": "Stream is active",823                "StreamArn": stream_arn,824            }825        )826        table_def["KinesisDataStreamDestinationStatus"] = "ACTIVE"827        return KinesisStreamingDestinationOutput(828            DestinationStatus="ACTIVE", StreamArn=stream_arn, TableName=table_name829        )830    def disable_kinesis_streaming_destination(831        self, context: RequestContext, table_name: TableName, stream_arn: StreamArn832    ) -> KinesisStreamingDestinationOutput:833        # Check if table exists, to avoid error log output from DynamoDBLocal834        if not self.table_exists(table_name):835            raise ResourceNotFoundException("Cannot do operations on a non-existent table")836        stream = EventForwarder.is_kinesis_stream_exists(stream_arn=stream_arn)837        if not stream:838            raise ValidationException(839                "User does not have a permission to use kinesis stream",840            )841        table_def = DynamoDBRegion.get().table_definitions.setdefault(table_name, {})842        stream_destinations = table_def.get("KinesisDataStreamDestinations")843        if stream_destinations:844            if table_def["KinesisDataStreamDestinationStatus"] == "ACTIVE":845                for dest in stream_destinations:846                    if dest["StreamArn"] == stream_arn and dest["DestinationStatus"] == "ACTIVE":847                        dest["DestinationStatus"] = "DISABLED"848                        dest["DestinationStatusDescription"] = ("Stream is disabled",)849                        table_def["KinesisDataStreamDestinationStatus"] = "DISABLED"850                        return KinesisStreamingDestinationOutput(851                            DestinationStatus="DISABLED",852                            StreamArn=stream_arn,853                            TableName=table_name,854                        )855        raise ValidationException(856            "Table is not in a valid state to disable Kinesis Streaming Destination:"857            "DisableKinesisStreamingDestination must be ACTIVE to perform DISABLE operation."858        )859    def describe_kinesis_streaming_destination(860        self, context: RequestContext, table_name: TableName861    ) -> DescribeKinesisStreamingDestinationOutput:862        # Check if table exists, to avoid error log output from DynamoDBLocal863        if not self.table_exists(table_name):864            raise ResourceNotFoundException("Cannot do operations on a non-existent table")865        table_def = DynamoDBRegion.get().table_definitions.get(table_name)866        stream_destinations = table_def.get("KinesisDataStreamDestinations") or []867        return DescribeKinesisStreamingDestinationOutput(868            KinesisDataStreamDestinations=stream_destinations, TableName=table_name869        )870    @staticmethod871    def table_exists(table_name):872        return aws_stack.dynamodb_table_exists(table_name)873    @staticmethod874    def prepare_request_headers(headers):875        def _replace(regex, replace):876            headers["Authorization"] = re.sub(877                regex, replace, headers.get("Authorization") or "", flags=re.IGNORECASE878            )879        # Note: We need to ensure that the same access key is used here for all requests,880        # otherwise DynamoDBLocal stores tables/items in separate namespaces881        _replace(r"Credential=[^/]+/", rf"Credential={constants.INTERNAL_AWS_ACCESS_KEY_ID}/")882        # Note: The NoSQL Workbench sends "localhost" or "local" as the region name, which we need to fix here883        _replace(884            r"Credential=([^/]+/[^/]+)/local(host)?/",885            rf"Credential=\1/{aws_stack.get_local_region()}/",886        )887    def fix_return_consumed_capacity(self, request_dict):888        # Fix incorrect values if ReturnValues==ALL_OLD and ReturnConsumedCapacity is889        # empty, see https://github.com/localstack/localstack/issues/2049890        return_values_all = (request_dict.get("ReturnValues") == "ALL_OLD") or (891            not request_dict.get("ReturnValues")892        )893        if return_values_all and not request_dict.get("ReturnConsumedCapacity"):894            request_dict["ReturnConsumedCapacity"] = "TOTAL"895    def fix_consumed_capacity(self, request: Dict, result: Dict):896        # make sure we append 'ConsumedCapacity', which is properly897        # returned by dynalite, but not by AWS's DynamoDBLocal898        table_name = request.get("TableName")899        return_cap = request.get("ReturnConsumedCapacity")900        if "ConsumedCapacity" not in result and return_cap in ["TOTAL", "INDEXES"]:901            request["ConsumedCapacity"] = {902                "TableName": table_name,903                "CapacityUnits": 5,  # TODO hardcoded904                "ReadCapacityUnits": 2,905                "WriteCapacityUnits": 3,906            }907    def fix_table_arn(self, table_arn: str) -> str:908        return re.sub(909            "arn:aws:dynamodb:ddblocal:",910            f"arn:aws:dynamodb:{aws_stack.get_region()}:",911            table_arn,912        )913    def prepare_transact_write_item_records(self, transact_items, existing_items):914        records = []915        record = self.get_record_template()916        # Fix issue #2745: existing_items only contain the Put/Update/Delete records,917        # so we will increase the index based on these events918        i = 0919        for request in transact_items:920            put_request = request.get("Put")921            if put_request:922                existing_item = existing_items[i]923                table_name = put_request["TableName"]924                keys = SchemaExtractor.extract_keys(item=put_request["Item"], table_name=table_name)925                # Add stream view type to record if ddb stream is enabled926                stream_spec = dynamodb_get_table_stream_specification(table_name=table_name)927                if stream_spec:928                    record["dynamodb"]["StreamViewType"] = stream_spec["StreamViewType"]929                new_record = copy.deepcopy(record)930                new_record["eventID"] = short_uid()931                new_record["eventName"] = "INSERT" if not existing_item else "MODIFY"932                new_record["dynamodb"]["Keys"] = keys933                new_record["dynamodb"]["NewImage"] = put_request["Item"]934                if existing_item:935                    new_record["dynamodb"]["OldImage"] = existing_item936                new_record["eventSourceARN"] = aws_stack.dynamodb_table_arn(table_name)937                new_record["dynamodb"]["SizeBytes"] = len(json.dumps(put_request["Item"]))938                records.append(new_record)939                i += 1940            update_request = request.get("Update")941            if update_request:942                table_name = update_request["TableName"]943                keys = update_request["Key"]944                updated_item = ItemFinder.find_existing_item(update_request, table_name)945                if not updated_item:946                    return []947                stream_spec = dynamodb_get_table_stream_specification(table_name=table_name)948                if stream_spec:949                    record["dynamodb"]["StreamViewType"] = stream_spec["StreamViewType"]950                new_record = copy.deepcopy(record)951                new_record["eventID"] = short_uid()952                new_record["eventName"] = "MODIFY"953                new_record["dynamodb"]["Keys"] = keys954                new_record["dynamodb"]["OldImage"] = existing_items[i]955                new_record["dynamodb"]["NewImage"] = updated_item956                new_record["eventSourceARN"] = aws_stack.dynamodb_table_arn(table_name)957                new_record["dynamodb"]["SizeBytes"] = len(json.dumps(updated_item))958                records.append(new_record)959                i += 1960            delete_request = request.get("Delete")961            if delete_request:962                table_name = delete_request["TableName"]963                keys = delete_request["Key"]964                existing_item = existing_items[i]965                stream_spec = dynamodb_get_table_stream_specification(table_name=table_name)966                if stream_spec:967                    record["dynamodb"]["StreamViewType"] = stream_spec["StreamViewType"]968                new_record = copy.deepcopy(record)969                new_record["eventID"] = short_uid()970                new_record["eventName"] = "REMOVE"971                new_record["dynamodb"]["Keys"] = keys972                new_record["dynamodb"]["OldImage"] = existing_item973                new_record["dynamodb"]["SizeBytes"] = len(json.dumps(existing_item))974                new_record["eventSourceARN"] = aws_stack.dynamodb_table_arn(table_name)975                records.append(new_record)976                i += 1977        return records978    def prepare_batch_write_item_records(979        self,980        request_items,981        existing_items,982        unprocessed_put_items: List,983        unprocessed_delete_items: List,984    ):985        records = []986        record = self.get_record_template()987        unprocessed_items = {"PutRequest": {}, "DeleteRequest": {}}988        i = 0989        for table_name in sorted(request_items.keys()):990            # Add stream view type to record if ddb stream is enabled991            stream_spec = dynamodb_get_table_stream_specification(table_name=table_name)992            if stream_spec:993                record["dynamodb"]["StreamViewType"] = stream_spec["StreamViewType"]994            for request in request_items[table_name]:995                put_request = request.get("PutRequest")996                if put_request:997                    if existing_items and len(existing_items) > i:998                        existing_item = existing_items[i]999                        keys = SchemaExtractor.extract_keys(1000                            item=put_request["Item"], table_name=table_name1001                        )1002                        new_record = copy.deepcopy(record)1003                        new_record["eventID"] = short_uid()1004                        new_record["dynamodb"]["SizeBytes"] = len(json.dumps(put_request["Item"]))1005                        new_record["eventName"] = "INSERT" if not existing_item else "MODIFY"1006                        new_record["dynamodb"]["Keys"] = keys1007                        new_record["dynamodb"]["NewImage"] = put_request["Item"]1008                        if existing_item:1009                            new_record["dynamodb"]["OldImage"] = existing_item1010                        new_record["eventSourceARN"] = aws_stack.dynamodb_table_arn(table_name)1011                        records.append(new_record)1012                    if unprocessed_put_items and len(unprocessed_put_items) > i:1013                        unprocessed_item = unprocessed_put_items[i]1014                        if unprocessed_item:1015                            unprocessed_items["PutRequest"].update(1016                                json.loads(json.dumps(unprocessed_item))1017                            )1018                delete_request = request.get("DeleteRequest")1019                if delete_request:1020                    if existing_items and len(existing_items) > i:1021                        keys = delete_request["Key"]1022                        new_record = copy.deepcopy(record)1023                        new_record["eventID"] = short_uid()1024                        new_record["eventName"] = "REMOVE"1025                        new_record["dynamodb"]["Keys"] = keys1026                        new_record["dynamodb"]["OldImage"] = existing_items[i]1027                        new_record["dynamodb"]["SizeBytes"] = len(json.dumps(existing_items[i]))1028                        new_record["eventSourceARN"] = aws_stack.dynamodb_table_arn(table_name)1029                        records.append(new_record)1030                    if unprocessed_delete_items and len(unprocessed_delete_items) > i:1031                        unprocessed_item = unprocessed_delete_items[i]1032                        if unprocessed_item:1033                            unprocessed_items["DeleteRequest"].update(1034                                json.loads(json.dumps(unprocessed_item))1035                            )1036                i += 11037        return records, unprocessed_items1038    def forward_stream_records(self, records: List[Dict], table_name: str = None):1039        if records and "eventName" in records[0]:1040            if table_name:1041                for record in records:1042                    record["eventSourceARN"] = aws_stack.dynamodb_table_arn(table_name)1043            EventForwarder.forward_to_targets(records, background=True)1044    def delete_all_event_source_mappings(self, table_arn):1045        if table_arn:1046            # fix start dynamodb service without lambda1047            if not is_api_enabled("lambda"):1048                return1049            lambda_client = aws_stack.connect_to_service("lambda")1050            result = lambda_client.list_event_source_mappings(EventSourceArn=table_arn)1051            for event in result["EventSourceMappings"]:1052                event_source_mapping_id = event["UUID"]1053                lambda_client.delete_event_source_mapping(UUID=event_source_mapping_id)1054    def get_record_template(self) -> Dict:1055        return {1056            "eventID": short_uid(),1057            "eventVersion": "1.1",1058            "dynamodb": {1059                # expects nearest second rounded down1060                "ApproximateCreationDateTime": int(time.time()),1061                # 'StreamViewType': 'NEW_AND_OLD_IMAGES',1062                "SizeBytes": -1,1063            },1064            "awsRegion": aws_stack.get_region(),1065            "eventSource": "aws:dynamodb",1066        }1067    def action_should_throttle(self, action, actions):1068        throttled = [f"{ACTION_PREFIX}{a}" for a in actions]1069        return (action in throttled) or (action in actions)1070    def should_throttle(self, action):1071        rand = random.random()1072        if rand < config.DYNAMODB_READ_ERROR_PROBABILITY and self.action_should_throttle(1073            action, READ_THROTTLED_ACTIONS1074        ):1075            return True1076        elif rand < config.DYNAMODB_WRITE_ERROR_PROBABILITY and self.action_should_throttle(1077            action, WRITE_THROTTLED_ACTIONS1078        ):1079            return True1080        elif rand < config.DYNAMODB_ERROR_PROBABILITY and self.action_should_throttle(1081            action, THROTTLED_ACTIONS1082        ):1083            return True1084        else:1085            return False1086# ---1087# Misc. util functions1088# ---1089def get_global_secondary_index(table_name, index_name):1090    schema = SchemaExtractor.get_table_schema(table_name)1091    for index in schema["Table"].get("GlobalSecondaryIndexes", []):1092        if index["IndexName"] == index_name:1093            return index1094    raise ResourceNotFoundException("Index not found")1095def is_index_query_valid(query_data: dict) -> bool:1096    table_name = to_str(query_data["TableName"])1097    index_name = to_str(query_data["IndexName"])1098    index_query_type = query_data.get("Select")1099    index = get_global_secondary_index(table_name, index_name)1100    index_projection_type = index.get("Projection").get("ProjectionType")1101    if index_query_type == "ALL_ATTRIBUTES" and index_projection_type != "ALL":1102        return False1103    return True1104def has_event_sources_or_streams_enabled(table_name: str, cache: Dict = None):1105    if cache is None:1106        cache = {}1107    if not table_name:1108        return1109    table_arn = aws_stack.dynamodb_table_arn(table_name)1110    cached = cache.get(table_arn)1111    if isinstance(cached, bool):1112        return cached1113    sources = lambda_api.get_event_sources(source_arn=table_arn)1114    result = False1115    if sources:1116        result = True1117    if not result and dynamodbstreams_api.get_stream_for_table(table_arn):1118        result = True...
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