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cln_plugin : Support wildcard subscriptions #7106

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ErikDeSmedt
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In Core Lightning plugins can subscribe to notifications using a wildcard *.
When the wildcard is used the plugin will receive all notifications.

This behavior was not supported by cln_plugin.
The first 2 commits create a plug-in that listens to the the wildcard *-subscription
and test the behavior. It appears that cln_plugin accepts the subscription but fails when the first plug-in message
is received.

The last commit adapts the cln_plugin-crate to support the wildcard.

@ErikDeSmedt
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ErikDeSmedt commented Feb 23, 2024

This PR is also useful to support sending notifications over GRPC. (See #7084)

For this plug-in it is useful to subscribe to all notifications.

@cdecker cdecker self-assigned this Mar 25, 2024
@cdecker cdecker added this to the v24.05 milestone Mar 25, 2024
tests/test_cln_rs.py Show resolved Hide resolved
Creates an example package that subscribes to all notifications and logs
them. This is useful for testing the behavior of subscribing to "*".

I've also edited the Makefile to ensure that `make` builds the example
and that `make clean` removes the example
This test reproduces a bug in the `cln-plugin`-crate.
Core Lightning supports a wildcard `*` that plugins can use to
subscribe to all notifications.

However, `cln-plugin` does not support this case.
It allows the developer to subscribe `*`.
But the plug-in crashes when the first notification is received
Adapts `cln_plugin` to make it support wildcard `*`-subscriptions.
@ErikDeSmedt
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I think the issues addressed by @rustyrussell have been fixed.
@endothermicdev: Could you merge this one cause it blocks #7084

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ACK e32e654

@endothermicdev endothermicdev merged commit f1dc64b into ElementsProject:master Apr 30, 2024
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4 participants