Пример #1
0
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)
}
Пример #2
0
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)
}