graph/db: let ForEachNodeCached take a context

graph/db/graph.go

@@ -245,14 +245,15 @@ func (c *ChannelGraph) GraphSession(cb func(graph NodeTraverser) error) error {
 // graph, executing the passed callback with each node encountered.
 //
 // NOTE: The callback contents MUST not be modified.
-func (c *ChannelGraph) ForEachNodeCached(cb func(node route.Vertex,
-	chans map[uint64]*DirectedChannel) error) error {
+func (c *ChannelGraph) ForEachNodeCached(ctx context.Context,
+	cb func(node route.Vertex,
+		chans map[uint64]*DirectedChannel) error) error {
 
 	if c.graphCache != nil {
 		return c.graphCache.ForEachNode(cb)
 	}
 
-	return c.V1Store.ForEachNodeCached(cb)
+	return c.V1Store.ForEachNodeCached(ctx, cb)
 }
 
 // AddLightningNode adds a vertex/node to the graph database. If the node is not

graph/db/graph_test.go

@@ -1358,7 +1358,7 @@ func TestGraphTraversal(t *testing.T) {
 	// set of channels (to force the fall back), we should find all the
 	// channel as well as the nodes included.
 	graph.graphCache = nil
-	err := graph.ForEachNodeCached(func(node route.Vertex,
+	err := graph.ForEachNodeCached(ctx, func(node route.Vertex,
 		chans map[uint64]*DirectedChannel) error {
 
 		if _, ok := nodeIndex[node]; !ok {

graph/db/interfaces.go

@@ -91,7 +91,7 @@ type V1Store interface { //nolint:interfacebloat
 	// DirectedChannel data to the call-back.
 	//
 	// NOTE: The callback contents MUST not be modified.
-	ForEachNodeCached(cb func(node route.Vertex,
+	ForEachNodeCached(ctx context.Context, cb func(node route.Vertex,
 		chans map[uint64]*DirectedChannel) error) error
 
 	// ForEachNode iterates through all the stored vertices/nodes in the

graph/db/kv_store.go

@@ -667,8 +667,9 @@ func (c *KVStore) FetchNodeFeatures(nodePub route.Vertex) (
 // data to the call-back.
 //
 // NOTE: The callback contents MUST not be modified.
-func (c *KVStore) ForEachNodeCached(cb func(node route.Vertex,
-	chans map[uint64]*DirectedChannel) error) error {
+func (c *KVStore) ForEachNodeCached(_ context.Context,
+	cb func(node route.Vertex,
+		chans map[uint64]*DirectedChannel) error) error {
 
 	// Otherwise call back to a version that uses the database directly.
 	// We'll iterate over each node, then the set of channels for each

graph/db/sql_store.go

@@ -1102,10 +1102,9 @@ func (s *SQLStore) ChanUpdatesInHorizon(startTime,
 // NOTE: The callback contents MUST not be modified.
 //
 // NOTE: part of the V1Store interface.
-func (s *SQLStore) ForEachNodeCached(cb func(node route.Vertex,
-	chans map[uint64]*DirectedChannel) error) error {
-
-	var ctx = context.TODO()
+func (s *SQLStore) ForEachNodeCached(ctx context.Context,
+	cb func(node route.Vertex,
+		chans map[uint64]*DirectedChannel) error) error {
 
 	return s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
 		return forEachNodeCacheable(ctx, db, func(nodeID int64,