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šäœãããŒã«ããã¯ãããããŒã¿ã®æŽåæ§ãä¿ãããŸãã SAMPLE_TIN = 'TIN1' # 环ç©ãã©ã³ã¶ã¯ã·ã§ã³ã¹ãã¢ã«ãããäžæã®èå¥åã衚ã SAMPLE_AMOUNT = 5000 # transact_write_items ã§åŠçããã売äžå€ã衚ã SAMPLE_TRANSACTION_ID = 'XXX111' DEFAULT_TAX_RATE = 10 # æ¢å®ã®çšç(ããŒã»ã³ããŒãžå€) LOWER_TAX_RATE = 5 # äœãæ¹ã®çšç(ããŒã»ã³ããŒãžå€) RETRYABLE_ERRORS = ( 'TransactionConflictException', 'ConditionalCheckFailedException', 'ProvisionedThroughputExceededException', 'ThrottlingException', 'ServiceUnavailableException', 'InternalServerErrorException' ) MAX_RETRIES = 3 RETRY_DELAY = 0.1 # ç§ def send_to_error_queue(error_message, is_retryable, transaction_id): queue_url = 'TransientErrorQueue' if is_retryable else 'NonTransientErrorQueue' message_body = { 'error_message': error_message, 'transaction_id': transaction_id } try: sqs.send_message( QueueUrl=queue_url, MessageBody=json.dumps(message_body) ) except Exception as e: print(f"Failed to send message to {queue_url}: {str(e)}") def process_transaction(tin, amount, transaction_id): for attempt in range(MAX_RETRIES + 1): try: response = dynamodb.get_item(TableName='CumulativeTransactionStore', Key={'cumulativeStore_primary_key': {'S': tin}}) item = response.get('Item') if not item: print("Record not found.") return cumulative_amount_consumed = int(item.get('cumulative_amount_consumed', {}).get('N', '0')) threshold_value = int(item.get('threshold_value', {}).get('N', '0')) current_amount = amount if (cumulative_amount_consumed + current_amount < threshold_value): update_expression = 'SET cumulative_amount_consumed = cumulative_amount_consumed + :val, tax_rate = :tax_rate' tax_rate = DEFAULT_TAX_RATE max_value = threshold_value min_value = 0 else: update_expression = 'SET cumulative_amount_consumed = cumulative_amount_consumed + :val, tax_rate = :tax_rate' tax_rate = LOWER_TAX_RATE max_value = sys.maxsize min_value = threshold_value expression_attribute_values = { ':val': {'N': str(current_amount)}, ':tax_rate': {'N': str(tax_rate)}, ':lo': {'N': str(min_value)}, ':hi': {'N': str(max_value)} } dynamodb.transact_write_items( TransactItems=[ { 'Update': { 'TableName': 'CumulativeTransactionStore', 'Key': {'cumulativeStore_primary_key': {'S': tin}}, 'UpdateExpression': update_expression, 'ConditionExpression': 'cumulative_amount_consumed < :hi AND cumulative_amount_consumed >= :lo', 'ExpressionAttributeValues': expression_attribute_values, } }, { 'Put': { 'TableName': 'TaxDeductionAuditStore', 'Item': { 'transactionID': {'S': transaction_id}, 'transaction_amount': {'N': str(amount)}, 'transaction_tax_amount': {'N': str(amount * tax_rate / 100)} } } } ], ClientRequestToken=transaction_id ) print(f"Transaction processed successfully on attempt {attempt + 1}") return # Success, exit the function except Exception as e: error_code = e.response['Error']['Code'] error_message = f"Error accessing DynamoDB: {error_code} - {e.response['Error']['Message']}" is_retryable = error_code in RETRYABLE_ERRORS if is_retryable and attempt < MAX_RETRIES: print(f"Retryable error occurred on attempt {attempt + 1}. Retrying...") time.sleep(RETRY_DELAY * (2 ** attempt)) # Exponential backoff else: send_to_error_queue(error_message, is_retryable, transaction_id) # If we've exhausted all retries error_message = f"Max retries ({MAX_RETRIES}) exceeded. Last error: {error_message}" send_to_error_queue(error_message, True, transaction_id) # Main execution try: process_transaction(SAMPLE_TIN, SAMPLE_AMOUNT, SAMPLE_TRANSACTION_ID) except Exception as e: print(f"Transaction processing failed: {str(e)}") çµæ ã·ã¹ãã ã®ããã©ãŒãã³ã¹è©äŸ¡ã§ã¯ãå®è¡æéã 30 ç§ã«åºå®ããã¹ã¬ããæ°ãå€ããªããäžé£ã®ãã¹ãã宿œããŸããã åå®è¡åŸã«çޝç©ãã©ã³ã¶ã¯ã·ã§ã³ã¹ãã¢ããŒãã«ãªã»ããããããšã§ãããŸããŸãªè² è·æ¡ä»¶äžã§ã®ã·ã¹ãã ã®åäœãå
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