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Adds support for changes endpoint (#41)
This endpoint allows receiving events when the database documents get created, changed, or deleted.
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# Copyright (c) 2021, ZIH, | ||
# Technische Universitaet Dresden, | ||
# Federal Republic of Germany | ||
# | ||
# All rights reserved. | ||
# | ||
# Redistribution and use in source and binary forms, with or without modification, | ||
# are permitted provided that the following conditions are met: | ||
# | ||
# * Redistributions of source code must retain the above copyright notice, | ||
# this list of conditions and the following disclaimer. | ||
# * Redistributions in binary form must reproduce the above copyright notice, | ||
# this list of conditions and the following disclaimer in the documentation | ||
# and/or other materials provided with the distribution. | ||
# * Neither the name of metricq nor the names of its contributors | ||
# may be used to endorse or promote products derived from this software | ||
# without specific prior written permission. | ||
# | ||
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | ||
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | ||
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | ||
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | ||
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | ||
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | ||
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | ||
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
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from typing import cast | ||
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from attr import dataclass | ||
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from . import database as db | ||
from . import document | ||
from .typing import JsonDict | ||
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@dataclass | ||
class BaseChangeEvent: | ||
"""The base event for shared properties""" | ||
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json: JsonDict | ||
"""The raw data of the event as JSON""" | ||
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@property | ||
def id(self) -> str: | ||
"""Returns the id of the document""" | ||
return cast(str, self.json["id"]) | ||
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@property | ||
def rev(self) -> str: | ||
"""Returns the new rev of the document""" | ||
return cast(str, self.json["changes"][0]["rev"]) | ||
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@property | ||
def sequence(self) -> str: | ||
"""Returns the sequence identifier of the event""" | ||
return cast(str, self.json["seq"]) | ||
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class DeletedEvent(BaseChangeEvent): | ||
"""This event denotes that the document got deleted""" | ||
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pass | ||
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@dataclass | ||
class ChangedEvent(BaseChangeEvent): | ||
"""This event denotes that the document got modified""" | ||
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database: "db.Database" | ||
"""The database for reference""" | ||
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async def doc(self) -> "document.Document": | ||
"""Returns the document after the change | ||
If the ``include_docs`` was set, this will use the data provided in the received event. | ||
Otherwise, the document is fetched from the server. | ||
""" | ||
try: | ||
# if in the request include_docs was given, we can create the | ||
# document on the spot... | ||
return document.Document( | ||
self.database, self.json["doc"]["_id"], self.json["doc"] | ||
) | ||
except KeyError: | ||
# ...otherwise, we fetch the document contents from the server | ||
return await self.database.get(self.id, rev=self.rev) |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,35 @@ | ||
# Copyright (c) 2021, ZIH, | ||
# Technische Universitaet Dresden, | ||
# Federal Republic of Germany | ||
# | ||
# All rights reserved. | ||
# | ||
# Redistribution and use in source and binary forms, with or without modification, | ||
# are permitted provided that the following conditions are met: | ||
# | ||
# * Redistributions of source code must retain the above copyright notice, | ||
# this list of conditions and the following disclaimer. | ||
# * Redistributions in binary form must reproduce the above copyright notice, | ||
# this list of conditions and the following disclaimer in the documentation | ||
# and/or other materials provided with the distribution. | ||
# * Neither the name of metricq nor the names of its contributors | ||
# may be used to endorse or promote products derived from this software | ||
# without specific prior written permission. | ||
# | ||
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | ||
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | ||
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | ||
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | ||
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | ||
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | ||
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | ||
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
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from typing import Any, Dict, List, Union | ||
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JsonDict = Dict[str, Any] | ||
JsonList = List[Any] | ||
Json = Union[JsonDict, JsonList] |
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