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clightning: add shutdown hook for plugin #318

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clightning: add shutdown hook for plugin #318

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YusukeShimizu
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@YusukeShimizu YusukeShimizu commented Sep 23, 2024 •
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Introduces a shutdown hook to the clightning plugin, ensuring that the plugin is gracefully stopped when c-lightning shuts down.

fixes: #307

@YusukeShimizu YusukeShimizu mentioned this pull request Sep 23, 2024
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@YusukeShimizu YusukeShimizu marked this pull request as ready for review September 24, 2024 11:16
@grubles
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grubles commented Oct 30, 2024

I'm getting this when shutting down CLN (v24.08.2):

2024-10-30T14:42:07.568Z UNUSUAL lightningd: JSON-RPC shutdown
2024-10-30T14:42:07.569Z DEBUG   lightningd: io_break: start_json_stream
2024-10-30T14:42:07.569Z DEBUG   lightningd: io_loop_with_timers: main
2024-10-30T14:42:07.569Z DEBUG   connectd: REPLY WIRE_CONNECTD_START_SHUTDOWN_REPLY with 0 fds
2024-10-30T14:42:07.569Z DEBUG   lightningd: io_break: connectd_start_shutdown_reply
...
2024-10-30T14:42:37.593Z DEBUG   lightningd: peerswap: failed to self-terminate in time, killing.
2024-10-30T14:42:37.594Z DEBUG   lightningd: io_break: destroy_plugin
2024-10-30T14:42:37.594Z DEBUG   lightningd: Command returned result after jcon close
2024-10-30T14:42:37.595Z DEBUG   connectd: Shutting down
2024-10-30T14:42:37.597Z DEBUG   gossipd: Shutting down
2024-10-30T14:42:37.598Z DEBUG   hsmd: Shutting down

Is this the intended behavior?

@YusukeShimizu
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The behavior seems to be different from what was expected.
It should terminate with logs like the ones below.
I added an E2E test to verify such behavior.
43b1d7d

clightning-1: 2024-11-10T00:53:24.810Z UNUSUAL lightningd: JSON-RPC shutdown
clightning-1: 2024-11-10T00:53:24.810Z DEBUG   lightningd: io_break: start_json_stream
2024-11-10T00:53:24.810Z DEBUG   lightningd: io_loop_with_timers: main
clightning-1: 2024-11-10T00:53:24.810Z DEBUG   connectd: REPLY WIRE_CONNECTD_START_SHUTDOWN_REPLY with 0 fds
2024-11-10T00:53:24.810Z DEBUG   lightningd: io_break: connectd_start_shutdown_reply
clightning-1: 2024-11-10T00:53:24.810Z DEBUG   03bed3ea4df3506aeacad110dd6c15d9a14e2ea9e9456fb84d07f2f291d31bf8d1-channeld-chan#1: Status closed, but not exited. Killing
clightning-1: 2024-11-10T00:53:24.810Z INFO    03bed3ea4df3506aeacad110dd6c15d9a14e2ea9e9456fb84d07f2f291d31bf8d1-chan#1: Peer transient failure in CHANNELD_NORMAL: channeld: Owning subdaemon channeld died (9)
clightning-1: 2024-11-10T00:53:24.811Z DEBUG   plugin-chanbackup: Killing plugin: exited during normal operation
2024-11-10T00:53:24.811Z DEBUG   plugin-bcli: Killing plugin: exited during normal operation
2024-11-10T00:53:24.812Z DEBUG   plugin-pay: Killing plugin: exited during normal operation
2024-11-10T00:53:24.812Z DEBUG   plugin-autoclean: Killing plugin: exited during normal operation
2024-11-10T00:53:24.812Z DEBUG   plugin-recover: Killing plugin: exited during normal operation
2024-11-10T00:53:24.813Z DEBUG   plugin-spenderp: Killing plugin: exited during normal operation
2024-11-10T00:53:24.813Z DEBUG   plugin-commando: Killing plugin: exited during normal operation
2024-11-10T00:53:24.813Z DEBUG   plugin-txprepare: Killing plugin: exited during normal operation
clightning-1: 2024-11-10T00:53:24.813Z DEBUG   plugin-funder: Killing plugin: exited during normal operation
clightning-1: 2024-11-10T00:53:24.813Z DEBUG   plugin-topology: Killing plugin: exited during normal operation
clightning-1: 2024-11-10T00:53:24.813Z DEBUG   plugin-keysend: Killing plugin: exited during normal operation
clightning-1: 2024-11-10T00:53:24.813Z DEBUG   plugin-offers: Killing plugin: exited during normal operation
clightning-1: 2024-11-10T00:53:24.814Z DEBUG   plugin-bookkeeper: Killing plugin: exited during normal operation
clightning-1: 2024-11-10T00:53:24.814Z DEBUG   plugin-sql: Killing plugin: exited during normal operation
clightning-1: 2024-11-10T00:53:24.814Z DEBUG   plugin-cln-askrene: Killing plugin: exited during normal operation
clightning-1: 2024-11-10T00:53:24.814Z DEBUG   plugin-cln-renepay: Killing plugin: exited during normal operation
clightning-1: 2024-11-10T00:53:24.814Z DEBUG   plugin-recklessrpc: Killing plugin: exited during normal operation
clightning-1: 2024-11-10T00:53:32.199Z DEBUG   03bed3ea4df3506aeacad110dd6c15d9a14e2ea9e9456fb84d07f2f291d31bf8d1-gossipd: seeker: startup peer finished
2024-11-10T00:53:32.199Z DEBUG   03bed3ea4df3506aeacad110dd6c15d9a14e2ea9e9456fb84d07f2f291d31bf8d1-gossipd: seeker: state = PROBING_SCIDS Seeking scids 1 - 112
2024-11-10T00:53:32.199Z DEBUG   03bed3ea4df3506aeacad110dd6c15d9a14e2ea9e9456fb84d07f2f291d31bf8d1-gossipd: sending query_channel_range for blocks 1+112
2024-11-10T00:53:32.199Z DEBUG   03bed3ea4df3506aeacad110dd6c15d9a14e2ea9e9456fb84d07f2f291d31bf8d1-connectd: peer_out WIRE_QUERY_CHANNEL_RANGE
clightning-1: 2024-11-10T00:53:32.199Z DEBUG   03bed3ea4df3506aeacad110dd6c15d9a14e2ea9e9456fb84d07f2f291d31bf8d1-gossipd: reply_channel_range 1+112 (of 1+112) 1 scids
2024-11-10T00:53:32.199Z DEBUG   gossipd: seeker: state = NORMAL No unannounced nodes
clightning-1: 2024-11-10T00:53:33.474Z DEBUG   03bed3ea4df3506aeacad110dd6c15d9a14e2ea9e9456fb84d07f2f291d31bf8d1-connectd: peer_out INVALID 42085
2024-11-10T00:53:33.474Z DEBUG   03bed3ea4df3506aeacad110dd6c15d9a14e2ea9e9456fb84d07f2f291d31bf8d1-connectd: peer_in INVALID 42085
clightning-1: 2024-11-10T00:53:33.476Z DEBUG   plugin-peerswap: Killing plugin: exited during normal operation
2024-11-10T00:53:33.476Z DEBUG   lightningd: io_break: destroy_plugin
clightning-1: 2024-11-10T00:53:33.476Z DEBUG   lightningd: Command returned result after jcon close
clightning-1: 2024-11-10T00:53:33.476Z DEBUG   connectd: Shutting down
clightning-1: 2024-11-10T00:53:33.477Z DEBUG   gossipd: Shutting down
clightning-1: 2024-11-10T00:53:33.477Z DEBUG   hsmd: Shutting down

@grubles
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grubles commented Nov 13, 2024 •
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Hmm peerswap is now exiting at startup thinking deprecated APIs are disabled if I'm using CLN master:

2024-11-13T14:17:20.121Z INFO    plugin-peerswap: WARNING: allow-deprecated-apis=false detected in CLN config. Exiting. More info: https://github.com/ElementsProject/peerswap/issues/232
2024-11-13T14:17:21.122Z INFO    plugin-peerswap: Killing plugin: exited during normal operation

@grubles
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grubles commented Nov 13, 2024

Using CLN v24.08.2, I'm getting the same self-termination message as before:

2024-11-13T17:33:33.607Z DEBUG   lightningd: peerswap: failed to self-terminate in time, killing.

@YusukeShimizu
clightning: add shutdown hook for plugin
22cdafa 
Introduces a shutdown hook to the clightning plugin, ensuring
that the plugin is gracefully stopped when c-lightning shuts down.

* Subscribe to the 'shutdown' event.
* Updated glightning dependency to include the 'shutdown' event.
@YusukeShimizu
fixup! clightning: add shutdown hook for plugin
e2095fc
@YusukeShimizu YusukeShimizu force-pushed the plugin-shutdown-subscription branch 2 times, most recently from 547f73e to e2095fc Compare November 15, 2024 08:24
@YusukeShimizu
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#330 updated the nix package and was tested with v24.08.02, but it seems the issue does not reproduce.
There might be a specific sequence when the issue occurs.

Regarding the deprecated APIs issue, I rebased on the master branch as the fix in the following PR might have an impact:
#321

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CLN plugin does not gracefully exit
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@YusukeShimizu @grubles