feat(dynamodb): add basic DynamoDB service implementation#191
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Implement DynamoDB service with in-memory storage using AWS JSON 1.0 protocol. Operations: - CreateTable, DeleteTable, ListTables, DescribeTable - PutItem, GetItem, DeleteItem, UpdateItem - Query, Scan Features: - Composite key support (HASH + RANGE) - Expression attribute names and values - Basic filter and update expression parsing - Pagination with LastEvaluatedKey Closes #6
Both SQS and DynamoDB use AWS JSON 1.0 protocol with POST / endpoint, causing route conflicts when both services are registered. This change introduces: - JSONProtocolDispatcher: routes requests based on X-Amz-Target header - JSONProtocolService interface: services implement TargetPrefix() and DispatchAction() to use the unified dispatcher - Updated SQS and DynamoDB to use the dispatcher instead of registering routes directly The dispatcher extracts the service prefix from X-Amz-Target (e.g., "AmazonSQS" or "DynamoDB_20120810") and routes to the appropriate service handler.
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Summary
Operations Implemented
Table Operations
Item Operations
Features
Test plan
make test-integrationmake lintCloses #6