Пример #1
0
// AppendEntry adds the given Entry to the Source's facts or edges.  It is
// assumed that src.Ticket == kytheuri.ToString(e.Source).
func AppendEntry(src *ipb.Source, e *spb.Entry) {
	if graphstore.IsEdge(e) {
		kind, ordinal, _ := schema.ParseOrdinal(e.EdgeKind)
		group, ok := src.EdgeGroups[kind]
		if !ok {
			group = &ipb.Source_EdgeGroup{}
			src.EdgeGroups[kind] = group
		}

		ticket := kytheuri.ToString(e.Target)

		ord := int32(ordinal)
		for _, edge := range group.Edges {
			if edge.Ticket == ticket && edge.Ordinal == ord {
				// Don't add duplicate edge
				return
			}
		}

		group.Edges = append(group.Edges, &ipb.Source_Edge{
			Ticket:  ticket,
			Ordinal: ord,
		})
	} else {
		src.Facts[e.FactName] = e.FactValue
	}
}
Пример #2
0
Файл: xrefs.go Проект: bzz/kythe
// getEdges returns edgeTargets with the given node as their source.  Only edge
// entries that return true when applied to pred are returned.
func getEdges(ctx context.Context, gs graphstore.Service, node *spb.VName, pred func(*spb.Entry) bool) ([]*edgeTarget, error) {
	var targets []*edgeTarget

	if err := gs.Read(ctx, &spb.ReadRequest{
		Source:   node,
		EdgeKind: "*",
	}, func(entry *spb.Entry) error {
		if graphstore.IsEdge(entry) && pred(entry) {
			edgeKind, ordinal, _ := schema.ParseOrdinal(entry.EdgeKind)
			targets = append(targets, &edgeTarget{edgeKind, entry.Target, int32(ordinal)})
		}
		return nil
	}); err != nil {
		return nil, fmt.Errorf("read error: %v", err)
	}
	return targets, nil
}
Пример #3
0
Файл: xrefs.go Проект: bzz/kythe
// Edges implements part of the Service interface.
func (g *GraphStoreService) Edges(ctx context.Context, req *xpb.EdgesRequest) (*xpb.EdgesReply, error) {
	if len(req.Ticket) == 0 {
		return nil, errors.New("no tickets specified")
	} else if req.PageToken != "" {
		return nil, errors.New("UNIMPLEMENTED: page_token")
	}

	patterns := xrefs.ConvertFilters(req.Filter)
	allowedKinds := stringset.New(req.Kind...)
	targetSet := stringset.New()
	reply := &xpb.EdgesReply{
		EdgeSets: make(map[string]*xpb.EdgeSet),
		Nodes:    make(map[string]*xpb.NodeInfo),
	}

	for _, ticket := range req.Ticket {
		vname, err := kytheuri.ToVName(ticket)
		if err != nil {
			return nil, fmt.Errorf("invalid ticket %q: %v", ticket, err)
		}

		var (
			// EdgeKind -> TargetTicket -> OrdinalSet
			filteredEdges = make(map[string]map[string]map[int32]struct{})
			filteredFacts = make(map[string][]byte)
		)

		if err := g.gs.Read(ctx, &spb.ReadRequest{
			Source:   vname,
			EdgeKind: "*",
		}, func(entry *spb.Entry) error {
			edgeKind := entry.EdgeKind
			if edgeKind == "" {
				// node fact
				if len(patterns) > 0 && xrefs.MatchesAny(entry.FactName, patterns) {
					filteredFacts[entry.FactName] = entry.FactValue
				}
			} else {
				// edge
				edgeKind, ordinal, _ := schema.ParseOrdinal(edgeKind)
				if len(req.Kind) == 0 || allowedKinds.Contains(edgeKind) {
					targets, ok := filteredEdges[edgeKind]
					if !ok {
						targets = make(map[string]map[int32]struct{})
						filteredEdges[edgeKind] = targets
					}
					ticket := kytheuri.ToString(entry.Target)
					ordSet, ok := targets[ticket]
					if !ok {
						ordSet = make(map[int32]struct{})
						targets[ticket] = ordSet
					}
					ordSet[int32(ordinal)] = struct{}{}
				}
			}
			return nil
		}); err != nil {
			return nil, fmt.Errorf("failed to retrieve entries for ticket %q", ticket)
		}

		// Only add a EdgeSet if there are targets for the requested edge kinds.
		if len(filteredEdges) > 0 {
			groups := make(map[string]*xpb.EdgeSet_Group)
			for edgeKind, targets := range filteredEdges {
				g := &xpb.EdgeSet_Group{}
				for target, ordinals := range targets {
					for ordinal := range ordinals {
						g.Edge = append(g.Edge, &xpb.EdgeSet_Group_Edge{
							TargetTicket: target,
							Ordinal:      ordinal,
						})
					}
					targetSet.Add(target)
				}
				groups[edgeKind] = g
			}
			reply.EdgeSets[ticket] = &xpb.EdgeSet{
				Groups: groups,
			}

			// In addition, only add a NodeInfo if the filters have resulting facts.
			if len(filteredFacts) > 0 {
				reply.Nodes[ticket] = &xpb.NodeInfo{
					Facts: filteredFacts,
				}
			}
		}
	}

	// Only request Nodes when there are fact filters given.
	if len(req.Filter) > 0 {
		// Eliminate redundant work by removing already requested nodes from targetSet
		for ticket := range reply.Nodes {
			targetSet.Remove(ticket)
		}

		// Batch request all leftover target nodes
		nodesReply, err := g.Nodes(ctx, &xpb.NodesRequest{
			Ticket: targetSet.Slice(),
			Filter: req.Filter,
		})
		if err != nil {
			return nil, fmt.Errorf("failure getting target nodes: %v", err)
		}
		for ticket, node := range nodesReply.Nodes {
			reply.Nodes[ticket] = node
		}
	}

	return reply, nil
}
Пример #4
0
func (d *DB) copyEntries(entries <-chan *spb.Entry) error {
	// Start a transaction for a COPY statement per table
	nodesTx, err := d.Begin()
	if err != nil {
		return err
	}
	edgesTx, err := d.Begin()
	if err != nil {
		return err
	}

	// Create each table in their corresponding transactions to speed up COPY
	if _, err := nodesTx.Exec(createNodesTable); err != nil {
		return fmt.Errorf("error truncating Nodes table: %v", err)
	} else if _, err := edgesTx.Exec(createEdgeTable); err != nil {
		return fmt.Errorf("error truncating Edges table: %v", err)
	}

	copyNode, err := nodesTx.Prepare(pq.CopyIn(
		"nodes",
		"ticket",
		"node_kind",
		"subkind",
		"text",
		"text_encoding",
		"start_offset",
		"end_offset",
		"snippet_start",
		"snippet_end",
		"other_facts_num",
		"other_facts",
	))
	if err != nil {
		return fmt.Errorf("error preparing Nodes copy: %v", err)
	}

	copyEdge, err := edgesTx.Prepare(pq.CopyIn(
		"edges",
		"source",
		"kind",
		"target",
		"ordinal",
	))
	if err != nil {
		return fmt.Errorf("error preparing Edges copy: %v", err)
	}

	var node srvpb.Node
	var nodeKind string
	var subkind, textEncoding *string
	var text *[]byte
	var startOffset, endOffset, snippetStart, snippetEnd *int64
	for e := range entries {
		if graphstore.IsNodeFact(e) {
			ticket := kytheuri.ToString(e.Source)
			if node.Ticket != "" && node.Ticket != ticket {
				nodeTicket := node.Ticket
				node.Ticket = ""
				var rec []byte
				if len(node.Fact) > 0 {
					rec, err = proto.Marshal(&node)
					if err != nil {
						return fmt.Errorf("error marshaling facts: %v", err)
					}
				}
				if text != nil && textEncoding == nil {
					textEncoding = proto.String(schema.DefaultTextEncoding)
				}
				if _, err := copyNode.Exec(
					nodeTicket,
					nodeKind,
					subkind,
					text,
					textEncoding,
					startOffset,
					endOffset,
					snippetStart,
					snippetEnd,
					len(node.Fact),
					rec,
				); err != nil {
					return fmt.Errorf("error copying node: %v", err)
				}
				node.Fact, text = node.Fact[0:0], nil
				nodeKind = ""
				subkind, textEncoding = nil, nil
				startOffset, endOffset, snippetStart, snippetEnd = nil, nil, nil, nil
			}
			if node.Ticket == "" {
				node.Ticket = ticket
			}
			switch e.FactName {
			case schema.NodeKindFact:
				nodeKind = string(e.FactValue)
			case schema.SubkindFact:
				subkind = proto.String(string(e.FactValue))
			case schema.TextFact:
				text = &e.FactValue
			case schema.TextEncodingFact:
				textEncoding = proto.String(string(e.FactValue))
			case schema.AnchorStartFact:
				n, err := strconv.ParseInt(string(e.FactValue), 10, 64)
				if err == nil {
					startOffset = proto.Int64(n)
				}
			case schema.AnchorEndFact:
				n, err := strconv.ParseInt(string(e.FactValue), 10, 64)
				if err == nil {
					endOffset = proto.Int64(n)
				}
			case schema.SnippetStartFact:
				n, err := strconv.ParseInt(string(e.FactValue), 10, 64)
				if err == nil {
					snippetStart = proto.Int64(n)
				}
			case schema.SnippetEndFact:
				n, err := strconv.ParseInt(string(e.FactValue), 10, 64)
				if err == nil {
					snippetEnd = proto.Int64(n)
				}
			default:
				node.Fact = append(node.Fact, &cpb.Fact{
					Name:  e.FactName,
					Value: e.FactValue,
				})
			}
		} else if schema.EdgeDirection(e.EdgeKind) == schema.Forward {
			kind, ordinal, _ := schema.ParseOrdinal(e.EdgeKind)
			ticket := kytheuri.ToString(e.Source)
			if _, err := copyEdge.Exec(ticket, kind, kytheuri.ToString(e.Target), ordinal); err != nil {
				return fmt.Errorf("error copying edge: %v", err)
			}
		}
	}

	if _, err := copyNode.Exec(); err != nil {
		return fmt.Errorf("error flushing nodes: %v", err)
	} else if _, err := copyEdge.Exec(); err != nil {
		return fmt.Errorf("error flushing edges: %v", err)
	}

	if err := nodesTx.Commit(); err != nil {
		return fmt.Errorf("error committing Nodes transaction: %v", err)
	} else if err := edgesTx.Commit(); err != nil {
		return fmt.Errorf("error committing Edges transaction: %v", err)
	}

	return nil
}