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channeldb: add persist nodeannounment config in db #8690

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Abdulkbk
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@Abdulkbk Abdulkbk commented Apr 25, 2024

In this commit, we save the node announcement config in the database so that we can retrieve the config later and use it when a node restarts.

closes #7123

Change Description

Description of change / link to associated issue.
We start by checking the configuration from the configuration file lnd.conf or arguments when the node starts. If the configuration is absent, we check for the ones persisted on disk and use them; otherwise, we resolve to the default settings.

Steps to Test

Steps for reviewers to follow to test the change.

  • Make sure no alias is not set in your lnd.conf
  • Use the updatenodeannouncement RPC call and set something as your alias
  • Verify the alias is set using lncli getinfo
  • Now stop and start the node again and run lncli getinfo again
  • You'll see that the alias is set to the first 10 characters of the node's pubkey

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Testing

  • Your PR passes all CI checks.
  • Tests covering the positive and negative (error paths) are included.
  • Bug fixes contain tests triggering the bug to prevent regressions.

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In this commit, we save nodeannouncement config in the database
so that we will be able to retrieve the config later and use them
on retart

Signed-off-by: Abdullahi Yunus <abdoollahikbk@gmail.com>
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In this commit, we check for nodeannouncement alias in the db before
creating a disk representation of a node. If there none, we default to
first 10 characters of our pubkey.
@Abdulkbk Abdulkbk marked this pull request as ready for review May 12, 2024 06:59
In this commit, we check for alias that are persisted in disk and use
them when the node is restarting.
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@Chinwendu20 Chinwendu20 left a comment

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Nice work, Left questions and doubts about the architecture

channeldb/db.go Outdated Show resolved Hide resolved
channeldb/node.go Show resolved Hide resolved
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@ellemouton ellemouton left a comment

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Thanks for the PR,
I think we want things to be more general and not just for the alias. Ie, for any of the fields you can change via UpdateNodeAnnouncement

channeldb/node.go Show resolved Hide resolved
type NodeAnnouncementDB struct {
backend kvdb.Backend
}

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we already persist our node announcement in the bucket storing all the collected node announcement. Can we not just grab our latest one from there?

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I don't know where the collected node announcements are stored. Are you referring to here where all nodes within a channel graph are stored and their node announcements (if they have any)?.

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yes - we store our node announcement there too right? if so, then i dont think we need a whole new bucket for it. Let me know if my assumption is incorrect

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@ellemouton I explored the code related to graph DB, and it turns out you're right. We're indeed storing our node along with the node announcement, and we can easily retrieve the stored values from this method when lnd starts.

Since this is the case, I will close this PR and open a new one to replace it. Does that make sense?

@Abdulkbk
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Nice work, Left questions and doubts about the architecture

Thanks for reviewing @Chinwendu20. I will look at the comments, answer your questions, and address any suggestions you gave me

In this commit, we ensure new configurations are saved whenever
node announcement is updated.
Here we try to determine the alias and color source for our node
when starting. The hierarchy is config set in lnd.conf take precedence
over persisted config and finally the default.
@Abdulkbk
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Abdulkbk commented Jun 3, 2024

Thanks for the PR, I think we want things to be more general and not just for the alias. Ie, for any of the fields you can change via UpdateNodeAnnouncement

I started with alias and color for the first iteration. I will be working on the next fields (feature bits, and addresses). Thanks for taking the time to review.

In this commit, we save the features and addresses assosciated with a node
in the database, and use them when the node restarts.
channeldb/db.go Outdated
// Create a top level bucket which holds information
// about our node announcement.
number: 32,
migration: mig.CreateTLB(nodeAnnouncementBucket),
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you dont need a migration to add a new bucket.

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I removed it in another commit.

channeldb/db.go Outdated
@@ -520,9 +526,6 @@ type ChannelStateDB struct {
// linkNodeDB separates all DB operations on LinkNodes.
linkNodeDB *LinkNodeDB

// nodeAnnouncementDB seperates all DB operations on NodeAnnouncements.
nodeAnnouncementDb *NodeAnnouncementDB

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this commit is removing a bunch of the code added in the previous commit - so it makes it very hard to grok what is actually happening in the PR. Maybe take some time to structure the commits in a more story-telling fashion 🙏

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Thanks for taking the time to review. I will restructure the commits to facilitate the review process.

channeldb/db.go Outdated
// Create a top level bucket which holds information
// about our node announcement.
number: 32,
migration: mig.CreateTLB(nodeAnnouncementBucket),
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if we remove this here, then no need to add it in the first place :)

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I initially included this, but after @Chinwendu20 's review, I realized it was unnecessary. Therefore, I removed it here.

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Good job @Abdulkbk, you can delete the commit then :) You can reach out to me on slack if you need help with it

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[feature]: Allow persisting dynamic configured alias when not set in lnd.conf or arguments
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