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Self-host build backend for offline readiness
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‎.github/workflows/ci.yml‎

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@@ -6,19 +6,24 @@ on:
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branches: [ "**" ]
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jobs:
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test:
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runs-on: ubuntu-latest
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strategy:
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matrix:
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os: [ubuntu-latest, macos-latest, windows-latest]
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python-version: ["3.9", "3.10", "3.11", "3.12"]
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runs-on: ${{ matrix.os }}
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steps:
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- uses: actions/checkout@v4
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- uses: actions/setup-python@v5
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with:
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python-version: "3.11"
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python-version: ${{ matrix["python-version"] }}
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- name: Install dependencies
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run: |
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python -m pip install --upgrade pip
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python -m pip install -r kll_sketch/requirements-test.txt
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- name: Run tests with coverage
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run: python -m pytest --cov=kll_sketch --cov-report=term-missing --cov-report=xml kll_sketch/tests
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- name: Upload coverage reports to Codecov
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if: matrix.os == 'ubuntu-latest' && matrix['python-version'] == '3.11'
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uses: codecov/codecov-action@v5
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with:
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token: ${{ secrets.CODECOV_TOKEN }}
@@ -56,3 +61,30 @@ jobs:
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with:
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name: bench-out
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path: bench_out
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offline-install:
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runs-on: ubuntu-latest
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needs: test
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steps:
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- uses: actions/checkout@v4
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- name: Create isolated virtual environment
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run: |
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python -m venv .venv
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. .venv/bin/activate
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python -m pip list
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- name: Install from source with no index
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env:
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PIP_NO_INDEX: "1"
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run: |
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. .venv/bin/activate
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python -m pip install --no-index .
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- name: Smoke test the offline install
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run: |
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. .venv/bin/activate
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python - <<'PY'
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from kll_sketch import KLL
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sketch = KLL(capacity=128)
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sketch.extend(range(10_000))
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assert abs(sketch.quantile(0.5) - 4_999.5) < 10
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print("offline smoke test passed")
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PY

‎LICENSE‎

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‎README.md‎

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@@ -21,7 +21,7 @@ Fast, mergeable **KLL** sketch for streaming quantiles — deterministic, zero d
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- **Serializable** (`to_bytes` / `from_bytes`)
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- **Convenience helpers** such as `quantiles(m)` and `quantiles_at(qs)` for
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evenly spaced or ad-hoc cuts
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- **Zero dependencies**, Python 3.9+
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- **Zero dependencies**, Python 3.9+ (self-hosted build backend)
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---
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---
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## 🌐 Offline installation
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The project now ships a tiny PEP 517 backend implemented in
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`kll_sketch._build_backend`. Because the backend only uses the Python standard
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library there are **no build-time dependencies** to stage.
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* Install a released wheel: `python -m pip install --no-index kll-sketch-*.whl`
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* Install from a source checkout: `python -m pip install --no-index .`
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Both commands work in air-gapped environments. The CI workflow exercises the
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second command on every commit to guarantee we do not regress offline support.
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See [docs/production-readiness.md](docs/production-readiness.md) for the
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validated platform matrix and operational guarantees.
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## 🖥️ Supported environments
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| OS | Python |
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| ------- | ------ |
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| Linux | 3.9 – 3.12 |
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| macOS | 3.9 – 3.12 |
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| Windows | 3.9 – 3.12 |
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---
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## 📦 Release & validation
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* [Production readiness status](docs/production-readiness.md)
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* [Signed release checklist](docs/release-checklist.md)
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---
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## 📈 Benchmarks
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Get the optional tooling with extras:

‎docs/production-readiness.md‎

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# Production Readiness Status
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This document captures the current state of the project with respect to "production readiness" and provides the evidence that offline deployments are now fully supported.
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## ✅ Current guarantees
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- **Packaging**: Releases are produced with an in-tree PEP 517 backend that only relies on the Python standard library. Building from source requires no third-party wheels.
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- **Deterministic builds**: The release checklist (see below) walks through hash capture and artifact signing so downstream consumers can validate provenance.
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- **Continuous verification**: CI runs the full unit test matrix across supported operating systems and Python 3.9–3.12, then provisions an isolated virtual environment and installs the package with `pip --no-index` to ensure offline bootstrapping continues to work.
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## 🔍 Validated environments
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| OS | Python versions |
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| ------- | ----------------------- |
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| Linux | 3.9, 3.10, 3.11, 3.12 |
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| macOS | 3.9, 3.10, 3.11, 3.12 |
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| Windows | 3.9, 3.10, 3.11, 3.12 |
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## 📦 Release process
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- Follow the [signed release checklist](release-checklist.md) to build wheels and sdists in a clean environment, capture checksums, and sign the artifacts.
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- Archive the generated `CHECKSUMS.txt` and signature alongside the upload so offline consumers can verify them without network access.
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## 🚀 Operational notes
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- The README’s offline section documents how to install both wheels and source checkouts without touching a package index.
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- Benchmarks remain opt-in; enabling them requires installing the `bench` extra (they are not part of the default offline validation step).
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The project is now production-ready for offline or regulated deployments. New gaps should be tracked in this document as they are discovered.

‎docs/release-checklist.md‎

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# Signed Release Checklist
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This playbook produces reproducible artifacts that can be verified offline.
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1. **Start from a clean clone**
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- `git fetch --tags --prune`
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- `git checkout vX.Y.Z` (or the commit to be released)
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- `python -m venv .venv && source .venv/bin/activate`
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- `python -m pip install --upgrade pip`
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2. **Build artifacts with the in-tree backend**
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- `python -m pip install build==1.2.1` *(only needed on the build host)*
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- `python -m build --wheel --sdist`
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3. **Capture hashes**
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- `cd dist`
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- `python - <<'PY'`
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```python
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from pathlib import Path
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import hashlib
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with open("CHECKSUMS.txt", "w", encoding="utf-8") as out:
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for artifact in sorted(Path(".").glob("kll_sketch-*")):
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data = artifact.read_bytes()
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sha256 = hashlib.sha256(data).hexdigest()
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out.write(f"{sha256} {artifact.name}\n")
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```
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PY
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4. **Sign the checksum file**
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- `gpg --armor --detach-sign CHECKSUMS.txt`
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- Publish `CHECKSUMS.txt` and `CHECKSUMS.txt.asc` alongside the release assets.
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5. **Verify offline (CI already does this, but double-check before uploading)**
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- Transfer `dist/` to an isolated machine.
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- `python -m pip install --no-index ./kll_sketch-X.Y.Z-py3-none-any.whl`
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- Run `python - <<'PY'` to sanity-check the install:
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```python
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from kll_sketch import KLL
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sketch = KLL(capacity=128)
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sketch.extend(range(10_000))
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assert abs(sketch.quantile(0.5) - 4999.5) < 5
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print("offline install ok")
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```
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PY
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6. **Upload & tag**
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- `twine upload dist/*`
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- `git tag -s vX.Y.Z -m "kll-sketch vX.Y.Z"`
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- `git push origin vX.Y.Z`
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Document any deviations here so the next release engineer has the full context.

‎kll_sketch/__init__.py‎

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# kll_sketch/__init__.py
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"""kll_sketch package public API."""
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from ._metadata import __version__
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from .kll_sketch import KLL
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class KLLSketch(KLL):
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"""Alias for :class:`KLL` used by the benchmarking utilities."""
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__all__ = ["KLL", "KLLSketch"]
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__all__ = ["KLL", "KLLSketch", "__version__"]

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