Let extensions declare HTTP routes - #16166
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📝 WalkthroughWalkthroughThe change adds the Merge Risk: ⚪ Minimal · up to Extensions can declare validated HTTP routes for core-managed mounting while existing registration remains compatible. No concrete current-head merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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In `@nodes.py`:
- Line 2244: Update the ROUTE_NAMESPACE validation to use fullmatch() instead of
match(), ensuring namespaces with trailing newlines or other unmatched
characters are rejected before server.add_extension_routes() mounts them.
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comfy_api/latest/__init__.pycomfy_api/v0_0_2/__init__.pycustom_nodes/example_node.py.examplenodes.pyserver.py
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Core node definitions (2500+ lines).
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nodes.py
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comfy_api/v0_0_2/__init__.pycustom_nodes/example_node.py.examplenodes.pycomfy_api/latest/__init__.pyserver.py
Treat `execution.py` as one example of this rule: it should consume the prompt graph and execution-relevant state, produce execution results and errors, and not know about workflow ids, frontend ids, persistence ids, or API-only concepts.
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comfy_api/v0_0_2/__init__.pycustom_nodes/example_node.py.examplenodes.pycomfy_api/latest/__init__.pyserver.py
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server.py (1)
1231-1231: 🩺 Stability & AvailabilityDo not raise this finding.
server.pyhas no change, and the inspected repository does not show an extension route contract that creates an explicitGET/HEADpair. The duplicateHEADfailure is not attributable to this change.
Extensions that serve an HTTP endpoint reach into a private global at import
time:
@PromptServer.instance.routes.get("/hello")
custom_nodes/example_node.py.example teaches this, directly above the
ComfyExtension subclass that should own it. 97 of the 500 most downloaded
packs on the Comfy Registry do it. There is no route surface in comfy_api at
all, so the API that exists to keep packs working across updates does not
cover this, and where an endpoint lands in the URL space is whatever the pack
typed.
Add an optional get_routes() alongside on_load() and get_node_list(). It is
non abstract and returns an empty list, so existing extensions are
unchanged. Declared routes go into nodes.EXTENSION_ROUTES and are mounted by
server.add_routes(), the handoff LOADED_MODULE_DIRS already uses, so nodes.py
still does not import server.
Everything mounts under /ext/<extension name>/, so an extension cannot take
a top level path or shadow a core route, and the existing /api mirror serves
it at /api/ext/... as well. Collection rejects a namespace or path that is
not a plain URL segment, a method aiohttp does not have, and a handler that
is not a coroutine, since handlers run on the server event loop. Two routes
that collide are left to the router; Comfy-Org#15541 makes that non fatal.
get_routes() is only reached through comfy_entrypoint. A module defining
NODE_CLASS_MAPPINGS is handled by the V1 branch, which returns before the
extension is built.
Addresses Comfy-Org#8603.
00ea36e to
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Oops, fixed with The path check had the same hole, so that is fixed too: |
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Generally a fan of this change. Probably won't get reviewed + merged today due to the holiday in the states, but I'll make sure we get a response in the next few days. Appreciate the contribution! |
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Looks a nice organisation improvement aswell. One concern with deriving the route namespace from For example, if the frontend expects Would it make sense for extensions to be able to declare a stable namespace explicitly, while using the module name as the default? Something like: namespace = extension.namespace or get_module_name(module_path)ComfyUI could still enforce the |
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One thing that could make this even more useful longer term is if route declarations eventually included typed request/response information. That could potentially allow ComfyUI to expose a schema for extension APIs and generate typed frontend clients automatically. It also makes having a stable namespace more valuable, since the route path would effectively become part of a generated API contract rather than just an implementation detail. |
3 participants
Let extensions declare HTTP routes
ComfyExtensionlets a pack declare what it provides and hand it to core asdata. It has two methods today,
on_loadandget_node_list. This adds athird,
get_routes, because routes are the one part of the extension surfacewith no V3 form:
NODE_CLASS_MAPPINGSget_node_list()@PromptServer.instance.routes.get(...)A pack that has fully migrated to
comfy_entrypointstill has to writefrom server import PromptServerto serve an endpoint. That is the import V3exists to make unnecessary, and it is the only one left.
Served under
/ext/<extension>/, so the example above is reachable at/api/ext/my_extension/status.What this changes, and what it does not
It makes registration declarative and owned by core. The pack describes, core
decides, the same split
get_node_listalready uses. Three things follow:the
serverimport disappears, core knows which pack owns which path, and abad route becomes a warning naming the pack instead of an aiohttp error during
boot that names nobody.
It does not improve the endpoint contract itself. Handlers are still
async def(request) -> responseagainst aiohttp, with no schema, typing,validation or versioning. This is the prerequisite for that work, not that
work. Worth flagging:
ExtensionRoute.handlernames aiohttp types incomfy_api, which is a coupling that was not there before. It is behindTYPE_CHECKINGso there is no runtime import, but the commitment is real andI would rather raise it than have it found in review.
Why declaring beats decorating
The decorator only works if the pack imports into the ComfyUI process while
PromptServer.instancealready exists. That holds by accident of ordering(
main.pybuilds the server at :537 and imports packs at :543), not bycontract, and it fails entirely for anything out of process.
Compatibility and conflicts
Nothing changes for existing packs.
get_routesis non-abstract and returns[], likeon_load; the decorator keeps working.Route conflicts are left to #15541, which already dedupes them for all routes
including GET-implies-HEAD and wildcards. With both branches merged, four route
definitions across two colliding packs reduce to two kept, two named warnings,
server starts. This PR validates namespace and path shape only.