func writePagedEdges(ctx context.Context, edges <-chan *srvpb.Edge, out table.Proto, opts *Options) error {
buffer := out.Buffered()
log.Println("Writing EdgeSets")
esb := &assemble.EdgeSetBuilder{
MaxEdgePageSize: opts.MaxPageSize,
Output: func(ctx context.Context, pes *srvpb.PagedEdgeSet) error {
return buffer.Put(ctx, xsrv.EdgeSetKey(pes.Source.Ticket), pes)
},
OutputPage: func(ctx context.Context, ep *srvpb.EdgePage) error {
return buffer.Put(ctx, xsrv.EdgePageKey(ep.PageKey), ep)
},
}
var grp *srvpb.EdgeGroup
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.EdgeGroup{
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
}
}
if err := esb.Flush(ctx); err != nil {
return err
}
return buffer.Flush(ctx)
}
func writeEdgePages(ctx context.Context, t table.Proto, edgeGroups *table.KVProto, maxEdgePageSize int) error {
// TODO(schroederc): spill large PagedEdgeSets into EdgePages
it, err := edgeGroups.ScanPrefix(nil, &keyvalue.Options{LargeRead: true})
if err != nil {
return err
}
defer it.Close()
log.Println("Writing EdgeSets")
esb := &assemble.EdgeSetBuilder{
MaxEdgePageSize: maxEdgePageSize,
Output: func(ctx context.Context, pes *srvpb.PagedEdgeSet) error {
return t.Put(ctx, xrefs.EdgeSetKey(pes.EdgeSet.SourceTicket), pes)
},
OutputPage: func(ctx context.Context, ep *srvpb.EdgePage) error {
return t.Put(ctx, xrefs.EdgePageKey(ep.PageKey), ep)
},
}
for {
k, v, err := it.Next()
if err == io.EOF {
break
} else if err != nil {
return fmt.Errorf("error scanning edge groups table: %v", err)
}
ss := strings.Split(string(k), tempTableKeySep)
if len(ss) != 3 {
return fmt.Errorf("invalid edge groups table key: %q", string(k))
}
src := ss[0]
var eg srvpb.EdgeSet_Group
if err := proto.Unmarshal(v, &eg); err != nil {
return fmt.Errorf("invalid edge groups table value: %v", err)
}
if err := esb.AddGroup(ctx, src, &eg); err != nil {
return err
}
}
return esb.Flush(ctx)
}
