mirror of
https://mau.dev/maunium/synapse.git
synced 2024-10-01 01:36:05 -04:00
182 lines
6.6 KiB
Python
182 lines
6.6 KiB
Python
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#!/usr/bin/env python
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# Copyright 2023 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""A script to calculate which versions of Synapse have backwards-compatible
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database schemas. It creates a Markdown table of Synapse versions and the earliest
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compatible version.
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It is compatible with the mdbook protocol for preprocessors (see
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https://rust-lang.github.io/mdBook/for_developers/preprocessors.html#implementing-a-preprocessor-with-a-different-language):
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Exit 0 to denote support for all renderers:
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./scripts-dev/schema_versions.py supports <mdbook renderer>
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Parse a JSON list from stdin and add the table to the proper documetnation page:
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./scripts-dev/schema_versions.py
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Additionally, the script supports dumping the table to stdout for debugging:
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./scripts-dev/schema_versions.py dump
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"""
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import io
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import json
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import sys
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from collections import defaultdict
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from typing import Any, Dict, Iterator, Optional, Tuple
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import git
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from packaging import version
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# The schema version has moved around over the years.
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SCHEMA_VERSION_FILES = (
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"synapse/storage/schema/__init__.py",
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"synapse/storage/prepare_database.py",
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"synapse/storage/__init__.py",
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"synapse/app/homeserver.py",
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)
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# Skip versions of Synapse < v1.0, they're old and essentially not
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# compatible with today's federation.
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OLDEST_SHOWN_VERSION = version.parse("v1.0")
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def get_schema_versions(tag: git.Tag) -> Tuple[Optional[int], Optional[int]]:
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"""Get the schema and schema compat versions for a tag."""
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schema_version = None
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schema_compat_version = None
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for file in SCHEMA_VERSION_FILES:
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try:
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schema_file = tag.commit.tree / file
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except KeyError:
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continue
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# We (usually) can't execute the code since it might have unknown imports.
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if file != "synapse/storage/schema/__init__.py":
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with io.BytesIO(schema_file.data_stream.read()) as f:
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for line in f.readlines():
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if line.startswith(b"SCHEMA_VERSION"):
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schema_version = int(line.split()[2])
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# Bail early.
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break
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else:
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# SCHEMA_COMPAT_VERSION is sometimes across multiple lines, the easist
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# thing to do is exec the code. Luckily it has only ever existed in
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# a file which imports nothing else from Synapse.
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locals: Dict[str, Any] = {}
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exec(schema_file.data_stream.read().decode("utf-8"), {}, locals)
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schema_version = locals["SCHEMA_VERSION"]
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schema_compat_version = locals.get("SCHEMA_COMPAT_VERSION")
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return schema_version, schema_compat_version
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def get_tags(repo: git.Repo) -> Iterator[git.Tag]:
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"""Return an iterator of tags sorted by version."""
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tags = []
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for tag in repo.tags:
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# All "real" Synapse tags are of the form vX.Y.Z.
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if not tag.name.startswith("v"):
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continue
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# There's a weird tag from the initial react UI.
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if tag.name == "v0.1":
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continue
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try:
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tag_version = version.parse(tag.name)
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except version.InvalidVersion:
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# Skip invalid versions.
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continue
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# Skip pre- and post-release versions.
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if tag_version.is_prerelease or tag_version.is_postrelease or tag_version.local:
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continue
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# Skip old versions.
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if tag_version < OLDEST_SHOWN_VERSION:
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continue
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tags.append((tag_version, tag))
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# Sort based on the version number (not lexically).
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return (tag for _, tag in sorted(tags, key=lambda t: t[0]))
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def calculate_version_chart() -> str:
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repo = git.Repo(path=".")
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# Map of schema version -> Synapse versions which are at that schema version.
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schema_versions = defaultdict(list)
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# Map of schema version -> Synapse versions which are compatible with that
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# schema version.
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schema_compat_versions = defaultdict(list)
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# Find ranges of versions which are compatible with a schema version.
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#
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# There are two modes of operation:
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#
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# 1. Pre-schema_compat_version (i.e. schema_compat_version of None), then
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# Synapse is compatible up/downgrading to a version with
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# schema_version >= its current version.
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#
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# 2. Post-schema_compat_version (i.e. schema_compat_version is *not* None),
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# then Synapse is compatible up/downgrading to a version with
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# schema version >= schema_compat_version.
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#
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# This is more generous and avoids versions that cannot be rolled back.
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#
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# See https://github.com/matrix-org/synapse/pull/9933 which was included in v1.37.0.
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for tag in get_tags(repo):
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schema_version, schema_compat_version = get_schema_versions(tag)
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# If a schema compat version is given, prefer that over the schema version.
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schema_versions[schema_version].append(tag.name)
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schema_compat_versions[schema_compat_version or schema_version].append(tag.name)
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# Generate a table which maps the latest Synapse version compatible with each
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# schema version.
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result = f"| {'Versions': ^19} | Compatible version |\n"
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result += f"|{'-' * (19 + 2)}|{'-' * (18 + 2)}|\n"
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for schema_version, synapse_versions in schema_compat_versions.items():
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result += f"| {synapse_versions[0] + ' – ' + synapse_versions[-1]: ^19} | {schema_versions[schema_version][0]: ^18} |\n"
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return result
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if __name__ == "__main__":
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if len(sys.argv) == 3 and sys.argv[1] == "supports":
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# We don't care about the renderer which is being used, which is the second argument.
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sys.exit(0)
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elif len(sys.argv) == 2 and sys.argv[1] == "dump":
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print(calculate_version_chart())
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else:
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# Expect JSON data on stdin.
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context, book = json.load(sys.stdin)
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for section in book["sections"]:
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if "Chapter" in section and section["Chapter"]["path"] == "upgrade.md":
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section["Chapter"]["content"] = section["Chapter"]["content"].replace(
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"<!-- REPLACE_WITH_SCHEMA_VERSIONS -->", calculate_version_chart()
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)
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# Print the result back out to stdout.
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print(json.dumps(book))
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