octorules-wirefilter

Rust FFI bindings for Cloudflare's wirefilter expression parser, exposed to Python via PyO3. octorules-cloudflare depends on this package to parse and type-check rule expressions — both the HTTP scheme and the Magic Transit / Layer-4 (magic_firewall) scheme — instead of regex heuristics.

Installation

# octorules-cloudflare installs this automatically as a required dependency.
# To install standalone:
pip install octorules-wirefilter

How it works

octorules lint
    │
    ▼
expression_bridge.py          Python-side routing layer
    │
    ├─► octorules_wirefilter   (if installed)
    │       │
    │       ├── lib.rs         PyO3 parse_expression(expr, scheme=None)
    │       ├── scheme.rs      HTTP + Magic Transit (L4) field/function schemes
    │       └── visitor.rs     AST walker → fields, functions, operators, literals
    │       │
    │       ▼
    │   wirefilter-engine      Cloudflare's Rust expression parser
    │
    └─► regex fallback         Built-in patterns (always available)

octorules-cloudflare requires octorules_wirefilter, so valid expressions are parsed by the real Cloudflare wirefilter engine. When wirefilter rejects an expression (e.g. a type mismatch or unknown function), the bridge runs a regex pass to still extract fields/operators — so the linter's own semantic rules can report on it — while preserving wirefilter's error. That same regex pass also covers the (now unsupported) case where the native extension can't be imported. Either path returns the same ExpressionInfo dataclass consumed by the linter.

Scheme

Two wirefilter schemes are built at startup and cached:

HTTP scheme (default): 169 fields exposed via get_schema_info(), 36 functions.
Magic Transit / Layer-4 scheme (magic_firewall): 33 packet-level fields (ip.proto, tcp.*, udp.*, …) for account-level network phases.
Named list support — expressions like ip.src in $my_list parse without error. AlwaysList is registered for Int, Ip, and Bytes types so any $name reference is accepted. Actual list validation (existence, type compatibility) is handled by the Python linter (CF102: unresolved list reference, CF104: field type incompatible with list kind).
Wildcard limit — ParserSettings enforces a maximum of 10 * metacharacters per wildcard pattern to prevent catastrophic backtracking.

The scheme parameter selects the field set: "magic_firewall" parses against the Layer-4 packet scheme; any other value (or None) uses the default HTTP scheme. Transform-phase function-call syntax (where http.request.uri.path is callable) is handled on the Python side.

Building from source

Prerequisites

Rust toolchain >= 1.86, edition 2024 (stable, via rustup)
Python >= 3.10 with venv
maturin (pip install maturin)

Development build

maturin develop

Builds the Rust crate and installs the resulting Python extension module into the active virtualenv.

Wheel build

maturin build --release

Produces a wheel in target/wheels/.

Testing

# Install test dependencies
pip install pytest

# Run FFI tests (requires octorules-wirefilter to be installed via maturin develop)
pytest tests/

Tests skip gracefully if the native extension is not installed.

API

This package exposes two functions. A type stub (octorules_wirefilter.pyi) ships in the wheel, so IDEs surface the signatures and result shapes documented below.

`parse_expression(expr, scheme=None)`

from octorules_wirefilter import parse_expression

# Parse an expression against the default scheme
result = parse_expression('http.host eq "example.com"')
# {'fields': ['http.host'], 'operators': ['eq'], 'string_literals': ['example.com'], ...}

# Pass scheme="magic_firewall" to parse against the Layer-4 packet scheme
# (Cloudflare Magic Transit / network phases).
result = parse_expression('ip.proto eq "tcp" and tcp.dstport eq 22', scheme="magic_firewall")

# Parse errors return an error key (all list keys present but empty)
result = parse_expression('bogus_field eq "x"')
# {'error': '...', 'fields': [], 'functions': [], 'operators': [], ...}

Returns a dict with keys fields, functions, operators, string_literals, regex_literals, ip_literals, int_literals, regex_field_pairs (all lists), plus:

On success: lists populated with extracted values. regex_field_pairs is a list of two-element lists [[field, regex], ...] showing which field each regex is matched against (e.g. [["http.request.uri.path", "^/api"]]); this shape is frozen and consumers may convert to tuples if desired. If AST nesting exceeded the depth limit, depth_exceeded: true is included.
On failure: error (string) with all list keys present but empty.

Expressions exceeding 1 MiB are rejected with an error dict before parsing. Nesting depth is capped at 100 levels to prevent stack overflow on pathological input.

`get_schema_info(scheme=None)`

from octorules_wirefilter import get_schema_info

info = get_schema_info()
# {'fields': [{'name': 'http.host', 'type': 'STRING'}, ...],
#  'functions': ['lower', 'upper', ...]}

Returns schema metadata for the requested scheme (scheme="magic_firewall" for the Layer-4 set; default is HTTP). octorules-cloudflare builds its linter field/function registry from this at import time. Field types use the Python FieldType enum names (STRING, INT, BOOL, IP, ARRAY_STRING, etc.).

Contributing

Field and function definitions live in one place — src/scheme.rs (register_common_fields, register_magic_firewall_fields, register_common_functions). octorules-cloudflare derives its Python field/function registry from these at import time via get_schema_info(); there is no second copy to keep in sync and no generated schemas.json.

Adding fields

Add the field to register_common_fields() (HTTP scheme) or register_magic_firewall_fields() (Magic Transit / Layer-4 scheme) in src/scheme.rs, then rebuild (maturin develop). octorules-cloudflare picks it up automatically. Python-only metadata (requires_plan, is_response) lives in that repo's overlay.toml.

Adding functions

Register the function in register_common_functions() in src/scheme.rs (and the COMMON_FUNCTION_NAMES list it's enumerated by), then rebuild. Function metadata (restricted_phases, requires_plan) lives in octorules-cloudflare's overlay.toml.

Design decisions

Separate PyPI package. The Rust build needs a toolchain, so this ships as prebuilt per-platform wheels. Keeping it standalone lets octorules-cloudflare depend on a versioned, wheel-distributed artifact instead of vendoring Rust into the provider.
Git dependency pinning. wirefilter-engine is pinned to a specific commit because the required APIs (SchemeBuilder, function registration) are not in the published crates.io version.
Stub function implementations. Functions are registered with correct type signatures but no-op execution. Expressions parse and extract correctly; runtime evaluation is not supported.
cdylib crate type. Required by PyO3's extension-module feature for Python to load the native extension.

License

octorules-wirefilter is licensed under the Apache License 2.0.

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octorules-wirefilter 0.5.2

octorules-wirefilter

Installation

How it works

Scheme

Building from source

Prerequisites

Development build

Wheel build

Testing

API

parse_expression(expr, scheme=None)

get_schema_info(scheme=None)

Contributing

Adding fields

Adding functions

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`parse_expression(expr, scheme=None)`

`get_schema_info(scheme=None)`

Algorithm	Hash digest
SHA256	`cb39f181200f46ba7d8b3ba6c95284c69a0a88b6f4ec6443cbd69483d1204a6d`
MD5	`9dd369417df9e7df99be0ff3fc69840f`
BLAKE2b-256	`729e909447d512f50be246af19867053a509a04575f52d69f28420b98bef5600`

Algorithm	Hash digest
SHA256	`02a16b4dda30101614aa57848cc813fdc9b8a820736830a2c55c4b4037a1bcda`
MD5	`04c2581b18f732b58bc112e7557baaf9`
BLAKE2b-256	`63f81f0e0cf55c43c7540febce92c34ecdc90e271a511449587c2c66a0aeb749`

Algorithm	Hash digest
SHA256	`a67ed9dffc02c771bfefb02c205d02958e98a376645400a005810fb245b3bbe2`
MD5	`c357bd79ee9a50959c7a016cab096d33`
BLAKE2b-256	`08f312289bfb4170521a73245e89766c280a52cf7a808273e9500878f67ea65b`

Algorithm	Hash digest
SHA256	`d00ef513ba308dc68867002512ee0972b9612cbd128411fede813420fa2a8ea9`
MD5	`8f4d5b7c627f99ba9796db17da078695`
BLAKE2b-256	`1c0cf1cb98834ccacbd8d8c37f953c5167db66b3b73e03b8910142a5ad0940f1`

Algorithm	Hash digest
SHA256	`311162109d7c5f4081d11b47d66b01c7b96c68cb386677e1a4474363f61642b4`
MD5	`16cb15dd7483a4e7d8b0b4357d3ffa17`
BLAKE2b-256	`c913d90a05f4425c37fe44b56145a21eb9db596b0e52d557b528478153d10d51`

Algorithm	Hash digest
SHA256	`9d3727ecd72703bbb7eb9860e679ec47ebf8b60a8eafe479006f7c91b079a4a4`
MD5	`50b7fc85dc707cd96322bdc97a92b074`
BLAKE2b-256	`806c29886effbcfe86d44eb0e1638850443de6695126b9d1025d7c3259927be2`

Algorithm	Hash digest
SHA256	`7ce6f3eabc73f863be8a41e8b75abe0d94c592b8b5597b8354fdedf138ea4c98`
MD5	`f284927209ef60c711510862e1615829`
BLAKE2b-256	`d41df15fe465b9cd442982fedc2458963150206b345758fe8ec959dc1619ec70`

Algorithm	Hash digest
SHA256	`a89e2f717f1189a3d759f3fb38f0b67d6e6b2d7878123b17dbdacd3173bbc3ea`
MD5	`14f872e6d298d22893c1750e79e62a4b`
BLAKE2b-256	`d2b52076b400b4c57d166bea657cb0377be3b34c899ad303b7f150d517337bb6`

Algorithm	Hash digest
SHA256	`16438dca71ddebe6c5cfbd3e500abff10271c9970d8c5ffc1a7037520433bd42`
MD5	`15e84d6af41d35d9d82f8016a61116eb`
BLAKE2b-256	`2d868f78eddf46277f63decbaf8c21adc29fe44a422feaa5ac5e95cb08c89239`

Algorithm	Hash digest
SHA256	`64bf1d8e70df25c2e5b5c4c93ee5fb9c7c84385b0ab726ed87ab64f1d6e9898a`
MD5	`535057c9560548a934e96b30287ec403`
BLAKE2b-256	`cb23c7cc4099985c028196a8364b013c7756735d315d36ab1add6c2c3c55a991`