The previous implementation of the graph cache evictor used
time.AfterFunc, which introduced a race condition. The closure
passed to AfterFunc could execute before the call returned and
assigned the timer to the r.graphCacheEvictor field.
This created a scenario where the closure would attempt to call
Reset() on a nil r.graphCacheEvictor, causing a panic.
This commit fixes the race by replacing time.AfterFunc with a
more robust pattern using time.NewTimer and a dedicated goroutine.
The new timer is created and assigned immediately, ensuring that
r.graphCacheEvictor is never nil when accessed.
The dedicated goroutine now safely manages the timer's lifecycle,
resetting it upon firing and stopping it gracefully upon server
shutdown, which also prevents goroutine leaks.
In this commit, the `MigrateGraphToSQL` function is expanded to migrate
the channel and channe policy data. Both of these have the special case
where the kvdb store records may contain invalid TLV. If we encounter a
channel with invalid TLV, we skip it and its policies. If we encounter a
policy with invalid TLV, we skip it.
The `TestMigrateGraphToSQL` and `TestMigrationWithChannelDB` tests are
updated accordingly.
Here, we move TLV validation for the KVStore out of `updateEdgePolicy`
so that we can re-use `updateEdgePolicy` in our tests to write policies
with invalid TLV (since that was possible before the recently added TLV
sanity check) so that we can test that our SQL migration behaves
correctly for these cases.
This commit expands MigrateGraphToSQL so that it migrates all the graph
nodes from kvdb to SQL.
The TestMigrateGraphToSQL test is updated to cover the basic
LightningNode cases. A new test, `TestSQLMigrationEdgeCases`, is also
added and a case is added to tests the edge case where a node exists in
our kvdb store that has invalid TLV bytes.
This commit was inspired by the invoices package
TestMigrationWithChannelDB test helper.
This test is purely for running locally to test the graph SQL migration.
It allows a dev to run the migration against a local `channel.sqlite` or
even `channel.db` file.
In this commit, the basic framework for the graph SQL migration is
added. This sets us up for the commits to follow which will add
migration logic for each table in the graph commit by commit.
