Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/actions/checkout/releases">actions/checkout's releases</a>.</em></p>
<blockquote>
<h2>v4.0.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Update default runtime to node20 by <a href="https://github.com/takost"><code>@​takost</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1436">actions/checkout#1436</a></li>
<li>Support fetching without the --progress option by <a href="https://github.com/simonbaird"><code>@​simonbaird</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1067">actions/checkout#1067</a></li>
<li>Release 4.0.0 by <a href="https://github.com/takost"><code>@​takost</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1447">actions/checkout#1447</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/takost"><code>@​takost</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/1436">actions/checkout#1436</a></li>
<li><a href="https://github.com/simonbaird"><code>@​simonbaird</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/1067">actions/checkout#1067</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/actions/checkout/compare/v3...v4.0.0">https://github.com/actions/checkout/compare/v3...v4.0.0</a></p>
<h2>v3.6.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Mark test scripts with Bash'isms to be run via Bash by <a href="https://github.com/dscho"><code>@​dscho</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1377">actions/checkout#1377</a></li>
<li>Add option to fetch tags even if fetch-depth &gt; 0 by <a href="https://github.com/RobertWieczoreck"><code>@​RobertWieczoreck</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/579">actions/checkout#579</a></li>
<li>Release 3.6.0 by <a href="https://github.com/luketomlinson"><code>@​luketomlinson</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1437">actions/checkout#1437</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/RobertWieczoreck"><code>@​RobertWieczoreck</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/579">actions/checkout#579</a></li>
<li><a href="https://github.com/luketomlinson"><code>@​luketomlinson</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/1437">actions/checkout#1437</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/actions/checkout/compare/v3.5.3...v3.6.0">https://github.com/actions/checkout/compare/v3.5.3...v3.6.0</a></p>
<h2>v3.5.3</h2>
<h2>What's Changed</h2>
<ul>
<li>Fix: Checkout Issue in self hosted runner due to faulty submodule check-ins by <a href="https://github.com/megamanics"><code>@​megamanics</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1196">actions/checkout#1196</a></li>
<li>Fix typos found by codespell by <a href="https://github.com/DimitriPapadopoulos"><code>@​DimitriPapadopoulos</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1287">actions/checkout#1287</a></li>
<li>Add support for sparse checkouts by <a href="https://github.com/dscho"><code>@​dscho</code></a> and <a href="https://github.com/dfdez"><code>@​dfdez</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1369">actions/checkout#1369</a></li>
<li>Release v3.5.3 by <a href="https://github.com/TingluoHuang"><code>@​TingluoHuang</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1376">actions/checkout#1376</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/megamanics"><code>@​megamanics</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/1196">actions/checkout#1196</a></li>
<li><a href="https://github.com/DimitriPapadopoulos"><code>@​DimitriPapadopoulos</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/1287">actions/checkout#1287</a></li>
<li><a href="https://github.com/dfdez"><code>@​dfdez</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/1369">actions/checkout#1369</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/actions/checkout/compare/v3...v3.5.3">https://github.com/actions/checkout/compare/v3...v3.5.3</a></p>
<h2>v3.5.2</h2>
<h2>What's Changed</h2>
<ul>
<li>Fix: Use correct API url / endpoint in GHES by <a href="https://github.com/fhammerl"><code>@​fhammerl</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1289">actions/checkout#1289</a> based on <a href="https://redirect.github.com/actions/checkout/issues/1286">#1286</a> by <a href="https://github.com/1newsr"><code>@​1newsr</code></a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/actions/checkout/compare/v3.5.1...v3.5.2">https://github.com/actions/checkout/compare/v3.5.1...v3.5.2</a></p>
<h2>v3.5.1</h2>
<h2>What's Changed</h2>
<ul>
<li>Improve checkout performance on Windows runners by upgrading <code>@​actions/github</code> dependency by <a href="https://github.com/BrettDong"><code>@​BrettDong</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1246">actions/checkout#1246</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/BrettDong"><code>@​BrettDong</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/1246">actions/checkout#1246</a></li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/actions/checkout/blob/main/CHANGELOG.md">actions/checkout's changelog</a>.</em></p>
<blockquote>
<h1>Changelog</h1>
<h2>v4.0.0</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1067">Support fetching without the --progress option</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1436">Update to node20</a></li>
</ul>
<h2>v3.6.0</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1377">Fix: Mark test scripts with Bash'isms to be run via Bash</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/579">Add option to fetch tags even if fetch-depth &gt; 0</a></li>
</ul>
<h2>v3.5.3</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1196">Fix: Checkout fail in self-hosted runners when faulty submodule are checked-in</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1287">Fix typos found by codespell</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1369">Add support for sparse checkouts</a></li>
</ul>
<h2>v3.5.2</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1289">Fix api endpoint for GHES</a></li>
</ul>
<h2>v3.5.1</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1246">Fix slow checkout on Windows</a></li>
</ul>
<h2>v3.5.0</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1237">Add new public key for known_hosts</a></li>
</ul>
<h2>v3.4.0</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1209">Upgrade codeql actions to v2</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1210">Upgrade dependencies</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1225">Upgrade <code>@​actions/io</code></a></li>
</ul>
<h2>v3.3.0</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1045">Implement branch list using callbacks from exec function</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1050">Add in explicit reference to private checkout options</a></li>
<li>[Fix comment typos (that got added in <a href="https://redirect.github.com/actions/checkout/issues/770">#770</a>)](<a href="https://redirect.github.com/actions/checkout/pull/1057">actions/checkout#1057</a>)</li>
</ul>
<h2>v3.2.0</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/942">Add GitHub Action to perform release</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/967">Fix status badge</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1002">Replace datadog/squid with ubuntu/squid Docker image</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/964">Wrap pipeline commands for submoduleForeach in quotes</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1029">Update <code>@​actions/io</code> to 1.1.2</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1039">Upgrading version to 3.2.0</a></li>
</ul>
<h2>v3.1.0</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/939">Use <code>@​actions/core</code> <code>saveState</code> and <code>getState</code></a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/922">Add <code>github-server-url</code> input</a></li>
</ul>
<h2>v3.0.2</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/770">Add input <code>set-safe-directory</code></a></li>
</ul>
<h2>v3.0.1</h2>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/actions/checkout/commit/3df4ab11eba7bda6032a0b82a6bb43b11571feac"><code>3df4ab1</code></a> Release 4.0.0 (<a href="https://redirect.github.com/actions/checkout/issues/1447">#1447</a>)</li>
<li><a href="https://github.com/actions/checkout/commit/8b5e8b768746b50394015010d25e690bfab9dfbc"><code>8b5e8b7</code></a> Support fetching without the --progress option (<a href="https://redirect.github.com/actions/checkout/issues/1067">#1067</a>)</li>
<li><a href="https://github.com/actions/checkout/commit/97a652b80035363df47baee5031ec8670b8878ac"><code>97a652b</code></a> Update default runtime to node20 (<a href="https://redirect.github.com/actions/checkout/issues/1436">#1436</a>)</li>
<li>See full diff in <a href="https://github.com/actions/checkout/compare/v3...v4">compare view</a></li>
</ul>
</details>
<br />


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You can trigger Dependabot actions by commenting on this PR:
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</details>
Bump actions/checkout from 3 to 4. Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/actions/checkout/releases">actions/checkout's releases</a>.</em></p>
<blockquote>
<h2>v4.0.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Update default runtime to node20 by <a href="https://github.com/takost"><code>@​takost</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1436">actions/checkout#1436</a></li>
<li>Support fetching without the --progress option by <a href="https://github.com/simonbaird"><code>@​simonbaird</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1067">actions/checkout#1067</a></li>
<li>Release 4.0.0 by <a href="https://github.com/takost"><code>@​takost</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1447">actions/checkout#1447</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/takost"><code>@​takost</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/1436">actions/checkout#1436</a></li>
<li><a href="https://github.com/simonbaird"><code>@​simonbaird</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/1067">actions/checkout#1067</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/actions/checkout/compare/v3...v4.0.0">https://github.com/actions/checkout/compare/v3...v4.0.0</a></p>
<h2>v3.6.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Mark test scripts with Bash'isms to be run via Bash by <a href="https://github.com/dscho"><code>@​dscho</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1377">actions/checkout#1377</a></li>
<li>Add option to fetch tags even if fetch-depth &gt; 0 by <a href="https://github.com/RobertWieczoreck"><code>@​RobertWieczoreck</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/579">actions/checkout#579</a></li>
<li>Release 3.6.0 by <a href="https://github.com/luketomlinson"><code>@​luketomlinson</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1437">actions/checkout#1437</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/RobertWieczoreck"><code>@​RobertWieczoreck</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/579">actions/checkout#579</a></li>
<li><a href="https://github.com/luketomlinson"><code>@​luketomlinson</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/1437">actions/checkout#1437</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/actions/checkout/compare/v3.5.3...v3.6.0">https://github.com/actions/checkout/compare/v3.5.3...v3.6.0</a></p>
<h2>v3.5.3</h2>
<h2>What's Changed</h2>
<ul>
<li>Fix: Checkout Issue in self hosted runner due to faulty submodule check-ins by <a href="https://github.com/megamanics"><code>@​megamanics</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1196">actions/checkout#1196</a></li>
<li>Fix typos found by codespell by <a href="https://github.com/DimitriPapadopoulos"><code>@​DimitriPapadopoulos</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1287">actions/checkout#1287</a></li>
<li>Add support for sparse checkouts by <a href="https://github.com/dscho"><code>@​dscho</code></a> and <a href="https://github.com/dfdez"><code>@​dfdez</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1369">actions/checkout#1369</a></li>
<li>Release v3.5.3 by <a href="https://github.com/TingluoHuang"><code>@​TingluoHuang</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1376">actions/checkout#1376</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/megamanics"><code>@​megamanics</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/1196">actions/checkout#1196</a></li>
<li><a href="https://github.com/DimitriPapadopoulos"><code>@​DimitriPapadopoulos</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/1287">actions/checkout#1287</a></li>
<li><a href="https://github.com/dfdez"><code>@​dfdez</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/1369">actions/checkout#1369</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/actions/checkout/compare/v3...v3.5.3">https://github.com/actions/checkout/compare/v3...v3.5.3</a></p>
<h2>v3.5.2</h2>
<h2>What's Changed</h2>
<ul>
<li>Fix: Use correct API url / endpoint in GHES by <a href="https://github.com/fhammerl"><code>@​fhammerl</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1289">actions/checkout#1289</a> based on <a href="https://redirect.github.com/actions/checkout/issues/1286">#1286</a> by <a href="https://github.com/1newsr"><code>@​1newsr</code></a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/actions/checkout/compare/v3.5.1...v3.5.2">https://github.com/actions/checkout/compare/v3.5.1...v3.5.2</a></p>
<h2>v3.5.1</h2>
<h2>What's Changed</h2>
<ul>
<li>Improve checkout performance on Windows runners by upgrading <code>@​actions/github</code> dependency by <a href="https://github.com/BrettDong"><code>@​BrettDong</code></a> in <a href="https://redirect.github.com/actions/checkout/pull/1246">actions/checkout#1246</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/BrettDong"><code>@​BrettDong</code></a> made their first contribution in <a href="https://redirect.github.com/actions/checkout/pull/1246">actions/checkout#1246</a></li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/actions/checkout/blob/main/CHANGELOG.md">actions/checkout's changelog</a>.</em></p>
<blockquote>
<h1>Changelog</h1>
<h2>v4.0.0</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1067">Support fetching without the --progress option</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1436">Update to node20</a></li>
</ul>
<h2>v3.6.0</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1377">Fix: Mark test scripts with Bash'isms to be run via Bash</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/579">Add option to fetch tags even if fetch-depth &gt; 0</a></li>
</ul>
<h2>v3.5.3</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1196">Fix: Checkout fail in self-hosted runners when faulty submodule are checked-in</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1287">Fix typos found by codespell</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1369">Add support for sparse checkouts</a></li>
</ul>
<h2>v3.5.2</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1289">Fix api endpoint for GHES</a></li>
</ul>
<h2>v3.5.1</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1246">Fix slow checkout on Windows</a></li>
</ul>
<h2>v3.5.0</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1237">Add new public key for known_hosts</a></li>
</ul>
<h2>v3.4.0</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1209">Upgrade codeql actions to v2</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1210">Upgrade dependencies</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1225">Upgrade <code>@​actions/io</code></a></li>
</ul>
<h2>v3.3.0</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/1045">Implement branch list using callbacks from exec function</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1050">Add in explicit reference to private checkout options</a></li>
<li>[Fix comment typos (that got added in <a href="https://redirect.github.com/actions/checkout/issues/770">#770</a>)](<a href="https://redirect.github.com/actions/checkout/pull/1057">actions/checkout#1057</a>)</li>
</ul>
<h2>v3.2.0</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/942">Add GitHub Action to perform release</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/967">Fix status badge</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1002">Replace datadog/squid with ubuntu/squid Docker image</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/964">Wrap pipeline commands for submoduleForeach in quotes</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1029">Update <code>@​actions/io</code> to 1.1.2</a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/1039">Upgrading version to 3.2.0</a></li>
</ul>
<h2>v3.1.0</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/939">Use <code>@​actions/core</code> <code>saveState</code> and <code>getState</code></a></li>
<li><a href="https://redirect.github.com/actions/checkout/pull/922">Add <code>github-server-url</code> input</a></li>
</ul>
<h2>v3.0.2</h2>
<ul>
<li><a href="https://redirect.github.com/actions/checkout/pull/770">Add input <code>set-safe-directory</code></a></li>
</ul>
<h2>v3.0.1</h2>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/actions/checkout/commit/3df4ab11eba7bda6032a0b82a6bb43b11571feac"><code>3df4ab1</code></a> Release 4.0.0 (<a href="https://redirect.github.com/actions/checkout/issues/1447">#1447</a>)</li>
<li><a href="https://github.com/actions/checkout/commit/8b5e8b768746b50394015010d25e690bfab9dfbc"><code>8b5e8b7</code></a> Support fetching without the --progress option (<a href="https://redirect.github.com/actions/checkout/issues/1067">#1067</a>)</li>
<li><a href="https://github.com/actions/checkout/commit/97a652b80035363df47baee5031ec8670b8878ac"><code>97a652b</code></a> Update default runtime to node20 (<a href="https://redirect.github.com/actions/checkout/issues/1436">#1436</a>)</li>
<li>See full diff in <a href="https://github.com/actions/checkout/compare/v3...v4">compare view</a></li>
</ul>
</details>
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</details>
"""Couchbase result store backend."""

from kombu.utils.url import _parse_url

from celery.exceptions import ImproperlyConfigured

from .base import KeyValueStoreBackend

try:
    from couchbase.auth import PasswordAuthenticator
    from couchbase.cluster import Cluster
except ImportError:
    Cluster = PasswordAuthenticator = None

try:
    from couchbase_core._libcouchbase import FMT_AUTO
except ImportError:
    FMT_AUTO = None

__all__ = ('CouchbaseBackend',)


class CouchbaseBackend(KeyValueStoreBackend):
    """Couchbase backend.

    Raises:
        celery.exceptions.ImproperlyConfigured:
            if module :pypi:`couchbase` is not available.
    """

    bucket = 'default'
    host = 'localhost'
    port = 8091
    username = None
    password = None
    quiet = False
    supports_autoexpire = True

    timeout = 2.5

    # Use str as couchbase key not bytes
    key_t = str

    def __init__(self, url=None, *args, **kwargs):
        kwargs.setdefault('expires_type', int)
        super().__init__(*args, **kwargs)
        self.url = url

        if Cluster is None:
            raise ImproperlyConfigured(
                'You need to install the couchbase library to use the '
                'Couchbase backend.',
            )

        uhost = uport = uname = upass = ubucket = None
        if url:
            _, uhost, uport, uname, upass, ubucket, _ = _parse_url(url)
            ubucket = ubucket.strip('/') if ubucket else None

        config = self.app.conf.get('couchbase_backend_settings', None)
        if config is not None:
            if not isinstance(config, dict):
                raise ImproperlyConfigured(
                    'Couchbase backend settings should be grouped in a dict',
                )
        else:
            config = {}

        self.host = uhost or config.get('host', self.host)
        self.port = int(uport or config.get('port', self.port))
        self.bucket = ubucket or config.get('bucket', self.bucket)
        self.username = uname or config.get('username', self.username)
        self.password = upass or config.get('password', self.password)

        self._connection = None

    def _get_connection(self):
        """Connect to the Couchbase server."""
        if self._connection is None:
            if self.host and self.port:
                uri = f"couchbase://{self.host}:{self.port}"
            else:
                uri = f"couchbase://{self.host}"
            if self.username and self.password:
                opt = PasswordAuthenticator(self.username, self.password)
            else:
                opt = None

            cluster = Cluster(uri, opt)

            bucket = cluster.bucket(self.bucket)

            self._connection = bucket.default_collection()
        return self._connection

    @property
    def connection(self):
        return self._get_connection()

    def get(self, key):
        return self.connection.get(key).content

    def set(self, key, value):
        # Since 4.0.0 value is JSONType in couchbase lib, so parameter format isn't needed
        if FMT_AUTO is not None:
            self.connection.upsert(key, value, ttl=self.expires, format=FMT_AUTO)
        else:
            self.connection.upsert(key, value, ttl=self.expires)

    def mget(self, keys):
        return self.connection.get_multi(keys)

    def delete(self, key):
        self.connection.remove(key)

"""Couchbase result store backend."""

from kombu.utils.url import _parse_url

from celery.exceptions import ImproperlyConfigured

from .base import KeyValueStoreBackend

try:
    from couchbase.auth import PasswordAuthenticator
    from couchbase.cluster import Cluster
except ImportError:
    Cluster = PasswordAuthenticator = None

try:
    from couchbase_core._libcouchbase import FMT_AUTO
except ImportError:
    FMT_AUTO = None

__all__ = ('CouchbaseBackend',)


class CouchbaseBackend(KeyValueStoreBackend):
    """Couchbase backend.

    Raises:
        celery.exceptions.ImproperlyConfigured:
            if module :pypi:`couchbase` is not available.
    """

    bucket = 'default'
    host = 'localhost'
    port = 8091
    username = None
    password = None
    quiet = False
    supports_autoexpire = True

    timeout = 2.5

    # Use str as couchbase key not bytes
    key_t = str

    def __init__(self, url=None, *args, **kwargs):
        kwargs.setdefault('expires_type', int)
        super().__init__(*args, **kwargs)
        self.url = url

        if Cluster is None:
            raise ImproperlyConfigured(
                'You need to install the couchbase library to use the '
                'Couchbase backend.',
            )

        uhost = uport = uname = upass = ubucket = None
        if url:
            _, uhost, uport, uname, upass, ubucket, _ = _parse_url(url)
            ubucket = ubucket.strip('/') if ubucket else None

        config = self.app.conf.get('couchbase_backend_settings', None)
        if config is not None:
            if not isinstance(config, dict):
                raise ImproperlyConfigured(
                    'Couchbase backend settings should be grouped in a dict',
                )
        else:
            config = {}

        self.host = uhost or config.get('host', self.host)
        self.port = int(uport or config.get('port', self.port))
        self.bucket = ubucket or config.get('bucket', self.bucket)
        self.username = uname or config.get('username', self.username)
        self.password = upass or config.get('password', self.password)

        self._connection = None

    def _get_connection(self):
        """Connect to the Couchbase server."""
        if self._connection is None:
            if self.host and self.port:
                uri = f"couchbase://{self.host}:{self.port}"
            else:
                uri = f"couchbase://{self.host}"
            if self.username and self.password:
                opt = PasswordAuthenticator(self.username, self.password)
            else:
                opt = None

            cluster = Cluster(uri, opt)

            bucket = cluster.bucket(self.bucket)

            self._connection = bucket.default_collection()
        return self._connection

    @property
    def connection(self):
        return self._get_connection()

    def get(self, key):
        return self.connection.get(key).content

    def set(self, key, value):
        # Since 4.0.0 value is JSONType in couchbase lib, so parameter format isn't needed
        if FMT_AUTO is not None:
            self.connection.upsert(key, value, ttl=self.expires, format=FMT_AUTO)
        else:
            self.connection.upsert(key, value, ttl=self.expires)

    def mget(self, keys):
        return self.connection.get_multi(keys)

    def delete(self, key):
        self.connection.remove(key)
