func writePagedEdges(ctx context.Context, edges <-chan *srvpb.Edge, out table.Proto, maxEdgePageSize int) error {
log.Println("Writing EdgeSets")
esb := &assemble.EdgeSetBuilder{
MaxEdgePageSize: maxEdgePageSize,
Output: func(ctx context.Context, pes *srvpb.PagedEdgeSet) error {
return out.Put(ctx, xrefs.EdgeSetKey(pes.EdgeSet.Source.Ticket), pes)
},
OutputPage: func(ctx context.Context, ep *srvpb.EdgePage) error {
return out.Put(ctx, xrefs.EdgePageKey(ep.PageKey), ep)
},
}
var grp *srvpb.EdgeSet_Group
for e := range edges {
if grp != nil && (e.Target == nil || grp.Kind != e.Kind) {
if err := esb.AddGroup(ctx, grp); err != nil {
for range edges {
} // drain input channel
return err
}
grp = nil
}
if e.Target == nil {
// Head-only edge: signals a new set of edges with the same Source
if err := esb.StartEdgeSet(ctx, e.Source); err != nil {
return err
}
} else if grp == nil {
grp = &srvpb.EdgeSet_Group{
Kind: e.Kind,
Target: []*srvpb.Node{e.Target},
}
} else {
grp.Target = append(grp.Target, e.Target)
}
}
if grp != nil {
if err := esb.AddGroup(ctx, grp); err != nil {
return err
}
}
return esb.Flush(ctx)
}
