pyjournalexport
Incremental parser for the systemd journal export format, written in Rust with Python bindings.
The export format is what journalctl -o export writes and what
systemd-journal-gatewayd serves for Accept: application/vnd.fdo.journal.
Every entry carries all of its fields, so a consumer that only needs a few
of them spends most of its time skipping the rest. This parser does the
skipping in Rust and only decodes the fields you ask for.
Usage
from pyjournalexport import JournalExportParser, MalformedBinaryEntryError
parser = JournalExportParser(["__CURSOR", "MESSAGE"])
for chunk in stream: # bytes, any chunking
for entry in parser.feed(chunk): # list of {field: value}
print(entry["MESSAGE"])
for entry in parser.close(): # trailing entry cut off at EOF
print(entry["MESSAGE"])
feed()returns the entries completed by the data so far; entries without any requested field are dropped.- Binary fields (name, newline, little-endian 64-bit size, data, newline) are supported. Values are decoded as UTF-8 with replacement characters.
- The last occurrence of a repeated field wins.
MalformedBinaryEntryErroris raised when binary data is not followed by a newline, or fromclose()when the stream ended inside a binary field.- Parsing is linear in the stream length regardless of chunking; an entry spanning many feeds is not rescanned.
Development
Requires a Rust toolchain (https://rustup.rs) and Python 3.12+.
uv sync
uv run maturin develop --release
uv run pytest
cargo test
cargo clippy --all-targets -- -D warnings
python benches/bench_parser.py times the parser on a synthetic stream.
Release
Tag a release on GitHub; the release workflow builds manylinux and musllinux wheels for x86_64, aarch64 and armv7, macOS wheels and an sdist, and publishes them to PyPI via trusted publishing.
1 maintainer
Metadata
1 maintainer
Release files for pyjournalexport 0.1.2
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Source distribution (sdist)
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Built distributions (wheels)
Total release size: 2.6 MB
Release files / pyjournalexport-0.1.2.tar.gz
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