tigrbl-kernel 0.4.4.dev1

Kernel orchestration for composing Tigrbl runtime plans, bindings, operation dispatch, and optimized ASGI execution.

tigrbl-kernel

Kernel orchestration for composing Tigrbl runtime plans, bindings, operation dispatch, and optimized ASGI execution.

What is tigrbl-kernel?

Kernel orchestration for composing Tigrbl runtime plans, bindings, operation dispatch, and optimized ASGI execution.

Why use tigrbl-kernel?

Use it when you need this foundational Tigrbl layer directly as a small, focused dependency.

When should I install tigrbl-kernel?

Install it for extension packages, package-local tests, or internals that need this boundary without the whole facade.

Who is tigrbl-kernel for?

Framework maintainers, extension authors, and advanced users composing Tigrbl from split packages.

Where does tigrbl-kernel fit?

tigrbl-kernel lives at pkgs/core/tigrbl_kernel and serves a focused layer in the split Tigrbl framework.

How does tigrbl-kernel work?

It owns a narrow layer in the split workspace and is consumed by higher-level packages through explicit dependencies.

Certification Status

• Package status: governed package in the tigrbl/tigrbl workspace.
• Governance source: SSOT registry.
• Release evidence: publish workflow validates package builds, tests, GitHub release assets, and PyPI publication for managed packages.
• Local certification guard: pkgs/core/tigrbl_tests/tests/unit/test_package_badges_and_notices.py verifies every package README keeps the Discord badge, Apache 2.0 badge, explicit Python-version badge, LICENSE, and NOTICE.
• Scope note: this README documents the package boundary. Runtime feature support remains governed by .ssot/ entities and the conformance docs linked below.

Install

uv add tigrbl-kernel

pip install tigrbl-kernel

Surface Coverage

Surface	Value
PyPI package	tigrbl-kernel
Repository path	pkgs/core/tigrbl_kernel
Python import root	tigrbl_kernel
Console scripts	none declared
Entry points	none declared
Optional extras	none declared
Legal files	LICENSE, NOTICE
Supported Python	3.10, 3.11, 3.12, 3.13, 3.14

What It Owns

tigrbl-kernel owns the foundational framework package boundary. It should be installed when you need this package's focused responsibility without assuming every other Tigrbl workspace package is present.

Implementation orientation:

• tigrbl_kernel: _build, _compile, atoms, cache, callbacks, contract_classification, core, eventkey, eventkey_hooks, events, helpers, hook_types

Package catalog:

• tigrbl_kernel/core.py, tigrbl_kernel/_build.py, tigrbl_kernel/_compile.py, tigrbl_kernel/models.py, tigrbl_kernel/types.py, and tigrbl_kernel/payload.py: kernel objects, operation views, packed plans, build/compile helpers, and payload contracts.
• tigrbl_kernel/ordering.py, tigrbl_kernel/labels.py, tigrbl_kernel/hook_types.py, tigrbl_kernel/callbacks.py, and tigrbl_kernel/eventkey_hooks.py: hook ordering, diagnostic labels, callback shape, and event-key-aware hook plumbing.
• tigrbl_kernel/cache.py, tigrbl_kernel/trace.py, and tigrbl_kernel/measure.py: cached plans, execution trace support, and measurement views.
• tigrbl_kernel/atoms.py, tigrbl_kernel/transport_atoms.py, and tigrbl_kernel/transaction_units.py: atom references and transaction/transport plan units.
• tigrbl_kernel/protocol_bindings.py, tigrbl_kernel/protocol_phase_tree.py, tigrbl_kernel/protocol_chains/, tigrbl_kernel/protocol_completion.py, tigrbl_kernel/protocol_fusion.py, and tigrbl_kernel/protocol_legality_matrix.py: transport-specific plan compilation, phase tree construction, chain definitions, completion semantics, fusion, and legality checks.
• tigrbl_kernel/eventkey.py, tigrbl_kernel/events.py, tigrbl_kernel/transport_events.py, tigrbl_kernel/webtransport_events.py, tigrbl_kernel/subevent_taxonomy.py, and tigrbl_kernel/subevent_handlers.py: event-key construction, subevent taxonomy, and protocol subevent handler mapping.
• tigrbl_kernel/opchannel_capabilities.py, tigrbl_kernel/loop_modes.py, tigrbl_kernel/loop_regions.py, tigrbl_kernel/segment_fusion.py, and tigrbl_kernel/contract_classification.py: channel capability checks, loop planning, segment grouping, and contract classification.
• tigrbl_kernel/rust_plan.py, tigrbl_kernel/rust_compile.py, and tigrbl_kernel/rust_spec.py: deprecated compatibility shims; kernel planning is Python-only.

Public API and Import Surface

• Import roots: tigrbl_kernel.
• Public symbols: BatchOpPlan, Kernel, OpView, PackedKernel, SchemaIn, SchemaOut, build_kernel_plan, build_packed_kernel, build_packed_kernel_measurement_view.
• Workspace dependencies: tigrbl-typing, tigrbl-atoms, tigrbl-core.
• External runtime dependencies: none declared.

Kernel Semantics

The kernel turns specs, operation inventories, hooks, atoms, and protocol bindings into executable plans. It does not own app authoring syntax, persistence engines, or concrete ASGI classes. Its job is to compile the behavior that runtime-owned routing will execute.

The basic flow is:

specs + model metadata + bindings + hooks
-> operation views
-> ordered phase plan
-> packed kernel
-> runtime execution and diagnostics

Kernel and PackedKernel are the planning surfaces; OpView is the operation-level view of schemas, handlers, hooks, bindings, and labels. build_kernel_plan(...) and build_packed_kernel(...) are useful for tests and framework packages that need to verify the compiled plan without driving a full ASGI request.

Protocol Planning

Protocol planning keeps binding kind, family, framing, exchange, lane, subevent rows, and atom anchors separate. The current planner handles:

Binding kind	Runtime family	Default framing	Plan shape
http.rest / https.rest	request	JSON	request received, handler invoke, response emit.
http.jsonrpc / https.jsonrpc	request	JSON-RPC	framing decode, dispatch, handler invoke, framing encode.
http.stream / https.stream	stream	stream	handler invoke, transport emit, stream close.
http.sse / https.sse	stream	SSE	encode event, emit event, close stream.
ws / wss / websocket	message	text or negotiated JSON-RPC	accept, decode, dispatch, handler, emit/close.
webtransport	session, stream, or datagram	WebTransport outer framing	lane-specific session, stream, or datagram rows with inner-framing validation.

Unsupported or ambiguous bindings raise planning errors. For example, WebSocket bindings do not accept HTTP methods, HTTP JSON-RPC requires an RPC method, WebTransport request/response exchange is unsupported, and WebTransport outer framing must remain webtransport.

Hook Ordering and Labels

The kernel orders security dependencies, dependencies, system hooks, user hooks, atoms, and handlers into phase plans. Labels are part of the diagnostics contract:

PRE_HANDLER:secdep:myapp.auth.require_user
PRE_HANDLER:dep:myapp.context.load_tenant
HANDLER:hook:sys:handler:create@HANDLER
EGRESS_SHAPE:atom:wire:dump

Use labels to debug and test ordering. Do not use them as application APIs; use specs, decorators, dependencies, and hooks for configuration.

Diagnostics and Traceability

Kernel plans feed /system/kernelz in concrete applications. Trace and measurement helpers make it possible to assert plan shape, count phase work, and inspect compiled execution without relying on a live server. This is especially important for transport work, where a route can look correct while the protocol chain is missing required event rows or capability masks.

Best Practices

• Compile plans from explicit specs and bindings; do not guess transport behavior from URL strings alone.
• Keep protocol support checks fail-closed and close to planning.
• Preserve separate event rows for request, stream, message, session, and datagram families.
• Add tests at the kernel layer when changing hook order, labels, phase rows, protocol legality, or capability masks.
• Use measurement views for plan review instead of parsing private object internals.
• Keep runtime side effects out of kernel code; the kernel should plan, classify, and label, not perform IO.

Usage Examples

Verify the installed package

python -m pip show tigrbl-kernel
python - <<'PY'
from importlib.metadata import version
print(version("tigrbl-kernel"))
PY

Import the package boundary

import importlib

module = importlib.import_module("tigrbl_kernel")
print(module.__name__)

Import a public symbol

from tigrbl_kernel import BatchOpPlan

print(BatchOpPlan)

Use with the facade when building applications

uv add tigrbl tigrbl-kernel
python - <<'PY'
import tigrbl
print(tigrbl.__name__)
PY

How To Choose This Package

Choose tigrbl-kernel when the quick-answer table matches your use case. Choose tigrbl instead when you want the full public facade. Choose a lower-level package such as tigrbl-core, tigrbl-base, or tigrbl-runtime when you are building framework extensions or testing a specific internal boundary.

Related Packages

• tigrbl-typing
• tigrbl-atoms
• tigrbl-core
• tigrbl
• tigrbl-base
• tigrbl-runtime

Documentation Links

• Workspace docs
• Package catalog
• Package layout
• Current target
• Current state
• Next steps
• Documentation pointers
• SSOT registry
• Release workflow

Support

• Community: Discord.
• Issues: GitHub Issues.
• Repository: pkgs/core/tigrbl_kernel.

Package-local Boundary

This file is a package-local distribution entry point. This README is the package-local distribution entry point for tigrbl-kernel. It answers install, usage, API, ownership, and certification-orientation questions for this package. Broader architectural decisions, release status, and cross-package proof chains remain in the repository-level docs and SSOT registry.

License

Licensed under the Apache License, Version 2.0. See LICENSE, NOTICE, and the official Apache 2.0 license text.