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multi: remove the need for the graphsession package

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In this commit, we add a `GraphSession` method to the `ChannelGraph`.
This method provides a caller with access to a `NodeTraverser`. This is
used by pathfinding to create a graph "session" overwhich to perform a
set of queries for a pathfinding attempt. With this refactor, we hide
details such as DB transaction creation and transaction commits from the
caller. So with this, pathfinding does not need to remember to "close
the graph session". With this commit, the `graphsession` package may be
completely removed.
This commit is contained in:
Elle Mouton
2025-02-13 09:44:14 +02:00
parent dfe2314a2a
commit e004447da6
11 changed files with 117 additions and 297 deletions
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68
graph/db/graph.go
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@@ -403,16 +403,6 @@ func initChannelGraph(db kvdb.Backend) error {
return nil
}
// NewPathFindTx returns a new read transaction that can be used for a single
// path finding session. Will return nil if the graph cache is enabled.
func (c *ChannelGraph) NewPathFindTx() (kvdb.RTx, error) {
if c.graphCache != nil {
return nil, nil
}
return c.db.BeginReadTx()
}
// AddrsForNode returns all known addresses for the target node public key that
// the graph DB is aware of. The returned boolean indicates if the given node is
// unknown to the graph DB or not.
@@ -3907,6 +3897,64 @@ func (c *ChannelGraph) IsClosedScid(scid lnwire.ShortChannelID) (bool, error) {
return isClosed, nil
}
// GraphSession will provide the call-back with access to a NodeTraverser
// instance which can be used to perform queries against the channel graph. If
// the graph cache is not enabled, then the call-back will be provided with
// access to the graph via a consistent read-only transaction.
func (c *ChannelGraph) GraphSession(cb func(graph NodeTraverser) error) error {
var (
tx kvdb.RTx
err error
commit = func() {}
)
if c.graphCache == nil {
tx, err = c.db.BeginReadTx()
if err != nil {
return err
}
commit = func() {
if err := tx.Rollback(); err != nil {
log.Errorf("Unable to rollback tx: %v", err)
}
}
}
defer commit()
return cb(&nodeTraverserSession{
db: c,
tx: tx,
})
}
// nodeTraverserSession implements the NodeTraverser interface but with a
// backing read only transaction for a consistent view of the graph in the case
// where the graph Cache has not been enabled.
type nodeTraverserSession struct {
tx kvdb.RTx
db *ChannelGraph
}
// ForEachNodeDirectedChannel calls the callback for every channel of the given
// node.
//
// NOTE: Part of the NodeTraverser interface.
func (c *nodeTraverserSession) ForEachNodeDirectedChannel(nodePub route.Vertex,
cb func(channel *DirectedChannel) error) error {
return c.db.ForEachNodeDirectedChannelTx(c.tx, nodePub, cb)
}
// FetchNodeFeatures returns the features of the given node. If the node is
// unknown, assume no additional features are supported.
//
// NOTE: Part of the NodeTraverser interface.
func (c *nodeTraverserSession) FetchNodeFeatures(nodePub route.Vertex) (
*lnwire.FeatureVector, error) {
return c.db.FetchNodeFeaturesTx(c.tx, nodePub)
}
func putLightningNode(nodeBucket kvdb.RwBucket, aliasBucket kvdb.RwBucket, // nolint:dupl
updateIndex kvdb.RwBucket, node *models.LightningNode) error {