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+# Copyright 2022 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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+
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+import os
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+import sys
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+from hashlib import blake2b
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+
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+import synapse
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+from synapse.synapse_rust import get_rust_file_digest
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+
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+
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+def check_rust_lib_up_to_date() -> None:
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+ """For editable installs check if the rust library is outdated and needs to
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+ be rebuilt.
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+ """
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+
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+ if not _dist_is_editable():
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+ return
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+
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+ synapse_dir = os.path.dirname(synapse.__file__)
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+ synapse_root = os.path.abspath(os.path.join(synapse_dir, ".."))
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+
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+ # Double check we've not gone into site-packages...
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+ if os.path.basename(synapse_root) == "site-packages":
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+ return
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+
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+ # ... and it looks like the root of a python project.
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+ if not os.path.exists("pyproject.toml"):
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+ return
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+
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+ # Get the hash of all Rust source files
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+ hash = _hash_rust_files_in_directory(os.path.join(synapse_root, "rust", "src"))
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+
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+ if hash != get_rust_file_digest():
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+ raise Exception("Rust module outdated. Please rebuild using `poetry install`")
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+
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+
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+def _hash_rust_files_in_directory(directory: str) -> str:
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+ """Get the hash of all files in a directory (recursively)"""
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+
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+ directory = os.path.abspath(directory)
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+
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+ paths = []
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+
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+ dirs = [directory]
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+ while dirs:
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+ dir = dirs.pop()
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+ with os.scandir(dir) as d:
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+ for entry in d:
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+ if entry.is_dir():
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+ dirs.append(entry.path)
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+ else:
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+ paths.append(entry.path)
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+
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+ # We sort to make sure that we get a consistent and well-defined ordering.
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+ paths.sort()
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+
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+ hasher = blake2b()
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+
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+ for path in paths:
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+ with open(os.path.join(directory, path), "rb") as f:
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+ hasher.update(f.read())
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+
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+ return hasher.hexdigest()
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+
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+
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+def _dist_is_editable() -> bool:
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+ """Is distribution an editable install?"""
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+ for path_item in sys.path:
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+ egg_link = os.path.join(path_item, "matrix-synapse.egg-link")
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+ if os.path.isfile(egg_link):
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+ return True
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+ return False
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