302 lines
11 KiB
Python
302 lines
11 KiB
Python
import json
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from typing import Any, Dict, Optional, Union
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from moto.core.common_types import TYPE_RESPONSE
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from moto.core.responses import BaseResponse
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from moto.core.utils import camelcase_to_underscores
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from .models import dynamodb_backends, DynamoDBBackend, dynamo_json_dump
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class DynamoHandler(BaseResponse):
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def __init__(self) -> None:
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super().__init__(service_name="dynamodb")
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def get_endpoint_name(self, headers: Dict[str, str]) -> Optional[str]: # type: ignore[return]
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"""Parses request headers and extracts part od the X-Amz-Target
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that corresponds to a method of DynamoHandler
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ie: X-Amz-Target: DynamoDB_20111205.ListTables -> ListTables
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"""
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# Headers are case-insensitive. Probably a better way to do this.
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match = headers.get("x-amz-target") or headers.get("X-Amz-Target")
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if match:
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return match.split(".")[1]
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def error(self, type_: str, status: int = 400) -> TYPE_RESPONSE:
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return status, self.response_headers, dynamo_json_dump({"__type": type_})
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def call_action(self) -> TYPE_RESPONSE:
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self.body = json.loads(self.body or "{}")
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endpoint = self.get_endpoint_name(self.headers)
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if endpoint:
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endpoint = camelcase_to_underscores(endpoint)
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response = getattr(self, endpoint)()
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if isinstance(response, str):
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return 200, self.response_headers, response
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else:
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status_code, new_headers, response_content = response
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self.response_headers.update(new_headers)
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return status_code, self.response_headers, response_content
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else:
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return 404, self.response_headers, ""
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@property
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def backend(self) -> DynamoDBBackend:
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return dynamodb_backends[self.current_account]["global"]
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def list_tables(self) -> str:
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body = self.body
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limit = body.get("Limit")
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if body.get("ExclusiveStartTableName"):
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last = body.get("ExclusiveStartTableName")
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start = list(self.backend.tables.keys()).index(last) + 1
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else:
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start = 0
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all_tables = list(self.backend.tables.keys())
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if limit:
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tables = all_tables[start : start + limit]
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else:
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tables = all_tables[start:]
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response: Dict[str, Any] = {"TableNames": tables}
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if limit and len(all_tables) > start + limit:
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response["LastEvaluatedTableName"] = tables[-1]
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return dynamo_json_dump(response)
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def create_table(self) -> str:
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body = self.body
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name = body["TableName"]
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key_schema = body["KeySchema"]
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hash_key = key_schema["HashKeyElement"]
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hash_key_attr = hash_key["AttributeName"]
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hash_key_type = hash_key["AttributeType"]
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range_key = key_schema.get("RangeKeyElement", {})
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range_key_attr = range_key.get("AttributeName")
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range_key_type = range_key.get("AttributeType")
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throughput = body["ProvisionedThroughput"]
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read_units = throughput["ReadCapacityUnits"]
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write_units = throughput["WriteCapacityUnits"]
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table = self.backend.create_table(
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name,
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hash_key_attr=hash_key_attr,
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hash_key_type=hash_key_type,
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range_key_attr=range_key_attr,
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range_key_type=range_key_type,
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read_capacity=int(read_units),
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write_capacity=int(write_units),
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)
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return dynamo_json_dump(table.describe)
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def delete_table(self) -> Union[str, TYPE_RESPONSE]:
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name = self.body["TableName"]
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table = self.backend.delete_table(name)
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if table:
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return dynamo_json_dump(table.describe)
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else:
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er = "com.amazonaws.dynamodb.v20111205#ResourceNotFoundException"
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return self.error(er)
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def update_table(self) -> str:
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name = self.body["TableName"]
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throughput = self.body["ProvisionedThroughput"]
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new_read_units = throughput["ReadCapacityUnits"]
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new_write_units = throughput["WriteCapacityUnits"]
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table = self.backend.update_table_throughput(
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name, new_read_units, new_write_units
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)
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return dynamo_json_dump(table.describe)
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def describe_table(self) -> Union[TYPE_RESPONSE, str]:
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name = self.body["TableName"]
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try:
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table = self.backend.tables[name]
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except KeyError:
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er = "com.amazonaws.dynamodb.v20111205#ResourceNotFoundException"
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return self.error(er)
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return dynamo_json_dump(table.describe)
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def put_item(self) -> Union[TYPE_RESPONSE, str]:
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name = self.body["TableName"]
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item = self.body["Item"]
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result = self.backend.put_item(name, item)
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if result:
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item_dict = result.to_json()
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item_dict["ConsumedCapacityUnits"] = 1
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return dynamo_json_dump(item_dict)
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else:
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er = "com.amazonaws.dynamodb.v20111205#ResourceNotFoundException"
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return self.error(er)
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def batch_write_item(self) -> str:
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table_batches = self.body["RequestItems"]
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for table_name, table_requests in table_batches.items():
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for table_request in table_requests:
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request_type = list(table_request)[0]
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request = list(table_request.values())[0]
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if request_type == "PutRequest":
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item = request["Item"]
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self.backend.put_item(table_name, item)
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elif request_type == "DeleteRequest":
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key = request["Key"]
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hash_key = key["HashKeyElement"]
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range_key = key.get("RangeKeyElement")
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self.backend.delete_item(table_name, hash_key, range_key)
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response = {
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"Responses": {
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"Thread": {"ConsumedCapacityUnits": 1.0},
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"Reply": {"ConsumedCapacityUnits": 1.0},
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},
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"UnprocessedItems": {},
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}
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return dynamo_json_dump(response)
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def get_item(self) -> Union[TYPE_RESPONSE, str]:
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name = self.body["TableName"]
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key = self.body["Key"]
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hash_key = key["HashKeyElement"]
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range_key = key.get("RangeKeyElement")
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attrs_to_get = self.body.get("AttributesToGet")
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try:
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item = self.backend.get_item(name, hash_key, range_key)
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except ValueError:
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er = "com.amazon.coral.validate#ValidationException"
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return self.error(er, status=400)
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if item:
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item_dict = item.describe_attrs(attrs_to_get)
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item_dict["ConsumedCapacityUnits"] = 0.5
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return dynamo_json_dump(item_dict)
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else:
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# Item not found
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er = "com.amazonaws.dynamodb.v20111205#ResourceNotFoundException"
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return self.error(er, status=404)
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def batch_get_item(self) -> str:
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table_batches = self.body["RequestItems"]
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results: Dict[str, Any] = {"Responses": {"UnprocessedKeys": {}}}
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for table_name, table_request in table_batches.items():
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items = []
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keys = table_request["Keys"]
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attributes_to_get = table_request.get("AttributesToGet")
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for key in keys:
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hash_key = key["HashKeyElement"]
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range_key = key.get("RangeKeyElement")
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item = self.backend.get_item(table_name, hash_key, range_key)
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if item:
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item_describe = item.describe_attrs(attributes_to_get)
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items.append(item_describe)
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results["Responses"][table_name] = {
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"Items": items,
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"ConsumedCapacityUnits": 1,
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}
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return dynamo_json_dump(results)
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def query(self) -> Union[TYPE_RESPONSE, str]:
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name = self.body["TableName"]
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hash_key = self.body["HashKeyValue"]
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range_condition = self.body.get("RangeKeyCondition")
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if range_condition:
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range_comparison = range_condition["ComparisonOperator"]
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range_values = range_condition["AttributeValueList"]
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else:
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range_comparison = None
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range_values = []
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items, _ = self.backend.query(name, hash_key, range_comparison, range_values)
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if items is None:
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er = "com.amazonaws.dynamodb.v20111205#ResourceNotFoundException"
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return self.error(er)
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result = {
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"Count": len(items), # type: ignore[arg-type]
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"Items": [item.attrs for item in items],
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"ConsumedCapacityUnits": 1,
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}
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# Implement this when we do pagination
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# if not last_page:
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# result["LastEvaluatedKey"] = {
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# "HashKeyElement": items[-1].hash_key,
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# "RangeKeyElement": items[-1].range_key,
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# }
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return dynamo_json_dump(result)
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def scan(self) -> Union[TYPE_RESPONSE, str]:
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name = self.body["TableName"]
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filters = {}
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scan_filters = self.body.get("ScanFilter", {})
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for attribute_name, scan_filter in scan_filters.items():
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# Keys are attribute names. Values are tuples of (comparison,
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# comparison_value)
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comparison_operator = scan_filter["ComparisonOperator"]
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comparison_values = scan_filter.get("AttributeValueList", [])
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filters[attribute_name] = (comparison_operator, comparison_values)
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items, scanned_count, _ = self.backend.scan(name, filters)
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if items is None:
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er = "com.amazonaws.dynamodb.v20111205#ResourceNotFoundException"
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return self.error(er)
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result = {
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"Count": len(items),
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"Items": [item.attrs for item in items if item],
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"ConsumedCapacityUnits": 1,
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"ScannedCount": scanned_count,
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}
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# Implement this when we do pagination
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# if not last_page:
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# result["LastEvaluatedKey"] = {
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# "HashKeyElement": items[-1].hash_key,
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# "RangeKeyElement": items[-1].range_key,
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# }
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return dynamo_json_dump(result)
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def delete_item(self) -> Union[TYPE_RESPONSE, str]:
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name = self.body["TableName"]
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key = self.body["Key"]
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hash_key = key["HashKeyElement"]
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range_key = key.get("RangeKeyElement")
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return_values = self.body.get("ReturnValues", "")
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item = self.backend.delete_item(name, hash_key, range_key)
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if item:
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if return_values == "ALL_OLD":
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item_dict = item.to_json()
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else:
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item_dict = {"Attributes": []}
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item_dict["ConsumedCapacityUnits"] = 0.5
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return dynamo_json_dump(item_dict)
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else:
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er = "com.amazonaws.dynamodb.v20111205#ResourceNotFoundException"
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return self.error(er)
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def update_item(self) -> Union[TYPE_RESPONSE, str]:
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name = self.body["TableName"]
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key = self.body["Key"]
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hash_key = key["HashKeyElement"]
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range_key = key.get("RangeKeyElement")
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updates = self.body["AttributeUpdates"]
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item = self.backend.update_item(name, hash_key, range_key, updates)
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if item:
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item_dict = item.to_json()
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item_dict["ConsumedCapacityUnits"] = 0.5
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return dynamo_json_dump(item_dict)
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else:
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er = "com.amazonaws.dynamodb.v20111205#ResourceNotFoundException"
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return self.error(er)
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