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from __future__ import annotations

import asyncio
from typing import TYPE_CHECKING, Any, AsyncIterator, Collection

from airflow.exceptions import AirflowException
from import SqsHook
from import MessageFilteringType, process_response
from airflow.triggers.base import BaseTrigger, TriggerEvent

    from import BaseAwsConnection

[docs]class SqsSensorTrigger(BaseTrigger): """ Asynchronously get messages from an Amazon SQS queue and then delete the messages from the queue. :param sqs_queue: The SQS queue url :param aws_conn_id: AWS connection id :param max_messages: The maximum number of messages to retrieve for each poke (templated) :param num_batches: The number of times the sensor will call the SQS API to receive messages (default: 1) :param wait_time_seconds: The time in seconds to wait for receiving messages (default: 1 second) :param visibility_timeout: Visibility timeout, a period of time during which Amazon SQS prevents other consumers from receiving and processing the message. :param message_filtering: Specified how received messages should be filtered. Supported options are: `None` (no filtering, default), `'literal'` (message Body literal match) or `'jsonpath'` (message Body filtered using a JSONPath expression). You may add further methods by overriding the relevant class methods. :param message_filtering_match_values: Optional value/s for the message filter to match on. For example, with literal matching, if a message body matches any of the specified values then it is included. For JSONPath matching, the result of the JSONPath expression is used and may match any of the specified values. :param message_filtering_config: Additional configuration to pass to the message filter. For example with JSONPath filtering you can pass a JSONPath expression string here, such as `'foo[*].baz'`. Messages with a Body which does not match are ignored. :param delete_message_on_reception: Default to `True`, the messages are deleted from the queue as soon as being consumed. Otherwise, the messages remain in the queue after consumption and should be deleted manually. :param waiter_delay: The time in seconds to wait between calls to the SQS API to receive messages. """ def __init__( self, sqs_queue: str, aws_conn_id: str | None = "aws_default", max_messages: int = 5, num_batches: int = 1, wait_time_seconds: int = 1, visibility_timeout: int | None = None, message_filtering: MessageFilteringType | None = None, message_filtering_match_values: Any = None, message_filtering_config: Any = None, delete_message_on_reception: bool = True, waiter_delay: int = 60, region_name: str | None = None, verify: bool | str | None = None, botocore_config: dict | None = None, ): self.sqs_queue = sqs_queue self.max_messages = max_messages self.num_batches = num_batches self.wait_time_seconds = wait_time_seconds self.visibility_timeout = visibility_timeout self.message_filtering = message_filtering self.delete_message_on_reception = delete_message_on_reception self.message_filtering_match_values = message_filtering_match_values self.message_filtering_config = message_filtering_config self.waiter_delay = waiter_delay self.aws_conn_id = aws_conn_id self.region_name = region_name self.verify = verify self.botocore_config = botocore_config
[docs] def serialize(self) -> tuple[str, dict[str, Any]]: return ( self.__class__.__module__ + "." + self.__class__.__qualname__, { "sqs_queue": self.sqs_queue, "aws_conn_id": self.aws_conn_id, "max_messages": self.max_messages, "num_batches": self.num_batches, "wait_time_seconds": self.wait_time_seconds, "visibility_timeout": self.visibility_timeout, "message_filtering": self.message_filtering, "delete_message_on_reception": self.delete_message_on_reception, "message_filtering_match_values": self.message_filtering_match_values, "message_filtering_config": self.message_filtering_config, "waiter_delay": self.waiter_delay, "region_name": self.region_name, "verify": self.verify, "botocore_config": self.botocore_config, }, )
[docs] def hook(self) -> SqsHook: return SqsHook( aws_conn_id=self.aws_conn_id, region_name=self.region_name, verify=self.verify, config=self.botocore_config, )
[docs] async def poll_sqs(self, client: BaseAwsConnection) -> Collection: """ Asynchronously poll SQS queue to retrieve messages. :param client: SQS connection :return: A list of messages retrieved from SQS """"SqsSensor checking for message on queue: %s", self.sqs_queue) receive_message_kwargs = { "QueueUrl": self.sqs_queue, "MaxNumberOfMessages": self.max_messages, "WaitTimeSeconds": self.wait_time_seconds, } if self.visibility_timeout is not None: receive_message_kwargs["VisibilityTimeout"] = self.visibility_timeout response = await client.receive_message(**receive_message_kwargs) return response
[docs] async def poke(self, client: Any): message_batch: list[Any] = [] for _ in range(self.num_batches):"starting call to poll sqs") response = await self.poll_sqs(client=client) messages = process_response( response, self.message_filtering, self.message_filtering_match_values, self.message_filtering_config, ) if not messages: continue message_batch.extend(messages) if self.delete_message_on_reception:"Deleting %d messages", len(messages)) entries = [ {"Id": message["MessageId"], "ReceiptHandle": message["ReceiptHandle"]} for message in messages ] response = await client.delete_message_batch(QueueUrl=self.sqs_queue, Entries=entries) if "Successful" not in response: raise AirflowException(f"Delete SQS Messages failed {response} for messages {messages}") return message_batch
[docs] async def run(self) -> AsyncIterator[TriggerEvent]: while True: # This loop will run indefinitely until the timeout, which is set in the self.defer # method, is reached. async with self.hook.async_conn as client: result = await self.poke(client=client) if result: yield TriggerEvent({"status": "success", "message_batch": result}) break else: await asyncio.sleep(self.waiter_delay)

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