audit-framework 0.1.0

Technology-agnostic audit logging, notification and case-management core. Pipe-and-filter pipeline + ports/adapters, zero runtime dependencies.

audit-framework

Technology-agnostic audit logging, notification & case-management core for Python services. A pipe-and-filter audit pipeline plus a ports-and-adapters plugin system — with zero runtime dependencies.

A standalone package published to PyPI (extracted from a monorepo). The core (audit_framework.core) depends only on the Python standard library. Every infrastructure concern (database, identity provider, SIEM sink, notification channel, case backend) lives behind a Protocol and ships as a separate plugin.

Why

Applications in regulated, compliance-sensitive contexts need to record who did what, when, to which resource, fan those events out to SIEM platforms, notify the right people in real time, and escalate incidents into case management — without coupling core logic to any specific database, IdP, or SIEM. Customers must be able to swap any component out. This package is that core.

Install

pip install audit-framework

Plugins (Postgres store, Keycloak identity, SSE push, JSONL/Splunk/ELK sinks, …) are installed separately and discovered at runtime — see Plugins.

Architecture at a glance

Event
  → AuditPolicyMiddleware   — decide IF/HOW to record (or halt)
  → RedactMiddleware        — strip sensitive fields (per selected policy + base_fields)
  → StoreMiddleware         — append to the audit store
  → SinkFanOutMiddleware    — fan out to SIEM/file sinks (parallel, best-effort)
  → BroadcastPolicyMiddleware — produce NotificationDirectives
  → DispatchMiddleware      — render + deliver over channels
  → EscalationMiddleware    — emit escalation.requested onto the event bus

Redaction runs after policy selection so a policy's redact_fields are honoured; add a second RedactMiddleware(base_fields=[...]) at the front if you need pre-policy scrubbing of always-sensitive fields.

Two independent policy layers are evaluated per event (audit ≠ broadcast). Fan-out (many sinks, many channels) happens inside a middleware via asyncio.gather, never by branching the chain. Bounded contexts (e.g. case management) communicate over an in-process EventBus — upgradeable to PostgreSQL LISTEN/NOTIFY, Redis, or NATS without touching the core.

Layout

src/audit_framework/core/
├── models.py            # AuditEvent, policies, notifications, PipelineContext (frozen)
├── ports.py             # every Protocol: stores, identity, channels, sinks, bus, ...
├── pipeline.py          # Pipeline + AuditMiddleware protocol (the chain orchestrator)
├── policy_engine.py     # PolicyMatcher, AuditPolicyEngine, BroadcastPolicyEngine
├── dispatcher.py        # routes directives → channels (render, persist, deliver)
├── decorators.py        # @auditable — the primary developer-facing API
├── plugin_registry.py   # PluginRegistry (entry-point + config discovery)
└── middlewares/         # the seven built-in middlewares

Quickstart

The core is fully runnable with in-memory adapters — no infrastructure required.

import asyncio
from audit_framework.core import (
    AuditEvent, AuditPolicy, BroadcastPolicy, BroadcastTarget, Pipeline,
)
from audit_framework.core.middlewares import (
    AuditPolicyMiddleware, BroadcastPolicyMiddleware, StoreMiddleware,
)
# ... bring your own (or in-memory) adapters implementing the ports ...

policy_store = MyPolicyStore(
    audit=[AuditPolicy(name="writes", match={"action": ["CREATE", "UPDATE", "DELETE"]})],
    broadcast=[BroadcastPolicy(
        name="notify-admins",
        match={"action": ["DELETE"]},
        targets=[BroadcastTarget(type="role", value="admin", channels=["in_app"])],
    )],
)

pipeline = (
    Pipeline()
    .use(AuditPolicyMiddleware(policy_store))
    .use(StoreMiddleware(my_audit_store))
    .use(BroadcastPolicyMiddleware(policy_store, my_identity_resolver))
    # ... dispatch, sinks, escalation ...
)

event = AuditEvent(
    actor_id="alice", action="DELETE", resource_type="contract",
    resource_id="c-42", timestamp="2026-06-26T00:00:00+00:00", request_id="req-1",
)
context = asyncio.run(pipeline.execute(event))
print(context.stored_id, len(context.directives))

The @auditable decorator (recommended)

Annotate service methods and forget about audit plumbing — ambient actor_id/request_id are read from contextvars your web middleware sets:

from audit_framework.core import auditable, set_pipeline_provider

set_pipeline_provider(lambda: pipeline)  # done once at startup

class ContractService:
    @auditable(action="UPDATE", resource_type="contract", resource_id="contract_id")
    async def update(self, contract_id: str, **changes) -> Contract:
        ...

The event is emitted only after the method returns successfully — a raising call is never recorded as a completed action.

Ports

Every external capability is a runtime_checkable Protocol in ports.py:

Category	Ports
Storage	AuditStore, NotificationStore, PolicyStore
Identity	IdentityResolver, ResourceOwnerResolver
Delivery	NotificationChannel, RealtimePush
Sinks	ExternalSink
Case management	CaseBackend, CaseRepository, AlertPublisher
Infrastructure	EventBus, Subscription, TemplateRenderer, ThrottleStore, Redactor

Plugins

A plugin is any package that implements one or more ports and exposes a register(registry) function. Two discovery mechanisms:

# my_plugin/plugin.py
def register(registry):
    registry.register("audit_store", "postgres", PostgresAuditStore)
    registry.register("external_sink", "splunk_hec", SplunkHECSink)

# my_plugin/pyproject.toml — entry-point discovery
[project.entry-points."audit_framework.plugins"]
postgres = "my_plugin.plugin:register"

registry = PluginRegistry()
registry.discover_entrypoints()                 # via installed entry points
registry.load_from_config(["my_plugin.plugin"]) # via explicit module paths
store = registry.get("audit_store", "postgres")

Development

pip install -e ".[dev]"
pytest                  # 48 stdlib-only tests, no infrastructure needed

The core test-suite drives coroutines with asyncio.run and uses in-memory fakes for every port (see tests/core/fakes.py), so it needs nothing but pytest.

Roadmap

The zero-dependency core (this package — pipeline, middlewares, policy engine, dispatcher, plugin registry, @auditable) is implemented and tested. Planned companion plugin packages, each a separate adapter behind the existing ports:

• audit-framework-postgres — AuditStore, NotificationStore, PG LISTEN/NOTIFY EventBus
• audit-framework-keycloak — IdentityResolver (Admin API + TTL cache)
• audit-framework-sse — RealtimePush / in-app SSE NotificationChannel
• audit-framework-sinks — JSONL / Splunk HEC / ELK / syslog ExternalSinks
• audit-framework-yaml — hot-reloadable YAML PolicyStore
• audit-framework-fastapi — ASGI middleware, SSE + REST endpoints, bootstrap wiring
• case-management bounded context (hexagonal) consuming escalation.requested

See docs/AUDIT_NOTIFICATION_SPEC.md for the full architecture specification.

License

MIT