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Original file line number | Diff line number | Diff line change |
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"""Amazon SQS queue implementation.""" | ||
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from __future__ import annotations | ||
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from vine import transform | ||
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from .message import AsyncMessage | ||
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_all__ = ['AsyncQueue'] | ||
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def list_first(rs): | ||
"""Get the first item in a list, or None if list empty.""" | ||
return rs[0] if len(rs) == 1 else None | ||
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class AsyncQueue: | ||
"""Async SQS Queue.""" | ||
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def __init__(self, connection=None, url=None, message_class=AsyncMessage): | ||
self.connection = connection | ||
self.url = url | ||
self.message_class = message_class | ||
self.visibility_timeout = None | ||
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def _NA(self, *args, **kwargs): | ||
raise NotImplementedError() | ||
count_slow = dump = save_to_file = save_to_filename = save = \ | ||
save_to_s3 = load_from_s3 = load_from_file = load_from_filename = \ | ||
load = clear = _NA | ||
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def get_attributes(self, attributes='All', callback=None): | ||
return self.connection.get_queue_attributes( | ||
self, attributes, callback, | ||
) | ||
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def set_attribute(self, attribute, value, callback=None): | ||
return self.connection.set_queue_attribute( | ||
self, attribute, value, callback, | ||
) | ||
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def get_timeout(self, callback=None, _attr='VisibilityTimeout'): | ||
return self.get_attributes( | ||
_attr, transform( | ||
self._coerce_field_value, callback, _attr, int, | ||
), | ||
) | ||
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def _coerce_field_value(self, key, type, response): | ||
return type(response[key]) | ||
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def set_timeout(self, visibility_timeout, callback=None): | ||
return self.set_attribute( | ||
'VisibilityTimeout', visibility_timeout, | ||
transform( | ||
self._on_timeout_set, callback, | ||
) | ||
) | ||
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def _on_timeout_set(self, visibility_timeout): | ||
if visibility_timeout: | ||
self.visibility_timeout = visibility_timeout | ||
return self.visibility_timeout | ||
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def add_permission(self, label, aws_account_id, action_name, | ||
callback=None): | ||
return self.connection.add_permission( | ||
self, label, aws_account_id, action_name, callback, | ||
) | ||
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def remove_permission(self, label, callback=None): | ||
return self.connection.remove_permission(self, label, callback) | ||
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def read(self, visibility_timeout=None, wait_time_seconds=None, | ||
callback=None): | ||
return self.get_messages( | ||
1, visibility_timeout, | ||
wait_time_seconds=wait_time_seconds, | ||
callback=transform(list_first, callback), | ||
) | ||
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def write(self, message, delay_seconds=None, callback=None): | ||
return self.connection.send_message( | ||
self, message.get_body_encoded(), delay_seconds, | ||
callback=transform(self._on_message_sent, callback, message), | ||
) | ||
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def write_batch(self, messages, callback=None): | ||
return self.connection.send_message_batch( | ||
self, messages, callback=callback, | ||
) | ||
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def _on_message_sent(self, orig_message, new_message): | ||
orig_message.id = new_message.id | ||
orig_message.md5 = new_message.md5 | ||
return new_message | ||
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def get_messages(self, num_messages=1, visibility_timeout=None, | ||
attributes=None, wait_time_seconds=None, callback=None): | ||
return self.connection.receive_message( | ||
self, number_messages=num_messages, | ||
visibility_timeout=visibility_timeout, | ||
attributes=attributes, | ||
wait_time_seconds=wait_time_seconds, | ||
callback=callback, | ||
) | ||
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def delete_message(self, message, callback=None): | ||
return self.connection.delete_message(self, message, callback) | ||
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def delete_message_batch(self, messages, callback=None): | ||
return self.connection.delete_message_batch( | ||
self, messages, callback=callback, | ||
) | ||
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def change_message_visibility_batch(self, messages, callback=None): | ||
return self.connection.change_message_visibility_batch( | ||
self, messages, callback=callback, | ||
) | ||
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def delete(self, callback=None): | ||
return self.connection.delete_queue(self, callback=callback) | ||
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def count(self, page_size=10, vtimeout=10, callback=None, | ||
_attr='ApproximateNumberOfMessages'): | ||
return self.get_attributes( | ||
_attr, callback=transform( | ||
self._coerce_field_value, callback, _attr, int, | ||
), | ||
) |
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