Golang CoreGraph.SuccessorsWith方法代碼示例

func datasetUnify(g system.CoreGraph, u system.UnifyInstructionForm) uint64 {
	vtv := g.VerticesWith(q.Qbv(system.VType("dataset"), "name", u.Vertex().Properties()["name"]))
	if len(vtv) == 0 {
		return 0
	}

	spec := u.ScopingSpecs()[0].(specDatasetHierarchy)
	el, success := spec.Environment.Resolve(g, 0, emptyVT(u.Vertex()))
	// FIXME scoping edge resolution failure does not mean no match - there could be an orphan
	if success {
		for _, vt := range vtv {
			if id := findMatchingEnvId(g, el, g.SuccessorsWith(vt.ID, q.Qbe(system.EType("dataset-hierarchy")))); id != 0 {
				return vt.ID
			}
		}
	}

	return 0
}

//.........這裏部分代碼省略.........
		e.Props = e.Props.Delete("ipv6")
		e.Props = e.Props.Delete("port")
		e.Props = e.Props.Delete("proto")
	} else {
		e.Props = e.Props.Set("port", system.Property{MsgSrc: mid, Value: spec.ConnNet.Port})
		e.Props = e.Props.Set("proto", system.Property{MsgSrc: mid, Value: spec.ConnNet.Proto})

		// can only be one of hostname, ipv4 or ipv6
		if spec.ConnNet.Hostname != "" {
			e.Props = e.Props.Set("hostname", system.Property{MsgSrc: mid, Value: spec.ConnNet.Hostname})
		} else if spec.ConnNet.Ipv4 != "" {
			e.Props = e.Props.Set("ipv4", system.Property{MsgSrc: mid, Value: spec.ConnNet.Ipv4})
		} else {
			e.Props = e.Props.Set("ipv6", system.Property{MsgSrc: mid, Value: spec.ConnNet.Ipv6})
		}
	}

	if success {
		return
	}

	var sock system.VertexTuple
	var rv system.VertexTupleVector // just for reuse
	// If net, must scan; if local, a bit easier.
	if !isLocal {
		// First, find the environment vertex
		rv = g.VerticesWith(q.Qbv(system.VType("environment")))
		var envid uint64
		for _, vt := range rv {
			if maputil.AnyMatch(e.Props, vt.Vertex.Properties, "hostname", "ipv4", "ipv6") {
				envid = vt.ID
				break
			}
		}

		// No matching env found, bail out
		if envid == 0 {
			return
		}

		// Now, walk the environment's edges to find the vertex representing the port
		rv = g.PredecessorsWith(envid, q.Qbv(system.VType("comm"), "type", "port", "port", spec.ConnNet.Port).And(q.Qbe(system.EType("envlink"))))

		if len(rv) != 1 {
			return
		}
		sock = rv[0]

		// With sock in hand, now find its proc
		rv = g.PredecessorsWith(sock.ID, q.Qbe(system.EType("listening"), "proto", spec.ConnNet.Proto).And(q.Qbv(system.VType("process"))))
		if len(rv) != 1 {
			// TODO could/will we ever allow >1?
			return
		}
	} else {
		envid, _, exists := findEnv(g, src)

		if !exists {
			// this is would be a pretty weird case
			return
		}

		// Walk the graph to find the vertex representing the unix socket
		rv = g.PredecessorsWith(envid, q.Qbv(system.VType("comm"), "path", spec.ConnUnix.Path).And(q.Qbe(system.EType("envlink"))))
		if len(rv) != 1 {
			return
		}
		sock = rv[0]

		// With sock in hand, now find its proc
		rv = g.PredecessorsWith(sock.ID, q.Qbv(system.VType("process")).And(q.Qbe(system.EType("listening"))))
		if len(rv) != 1 {
			// TODO could/will we ever allow >1?
			return
		}
	}

	rv = g.SuccessorsWith(rv[0].ID, q.Qbv(system.VType("parent-dataset")))
	// FIXME this absolutely could be more than 1
	if len(rv) != 1 {
		return
	}
	dataset := rv[0]

	// if the spec indicates a subset, find it
	if spec.Subset != "" {
		rv = g.PredecessorsWith(rv[0].ID, q.Qbv(system.VType("dataset"), "name", spec.Subset).And(q.Qbe(system.EType("dataset-hierarchy"))))
		if len(rv) != 1 {
			return
		}
		dataset = rv[0]
	}

	// FIXME only recording the final target id is totally broken; see https://github.com/pipeviz/pipeviz/issues/37

	// Aaaand we found our target.
	success = true
	e.Target = dataset.ID
	return
}