blob: b21a95ae754805bfccd53537c552c30d65d1e799 [file] [log] [blame]
// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package compliance
// ShippedNodes returns the set of nodes in a license graph where the target or
// a derivative work gets distributed. (caches result)
func ShippedNodes(lg *LicenseGraph) TargetNodeSet {
lg.mu.Lock()
shipped := lg.shippedNodes
lg.mu.Unlock()
if shipped != nil {
return *shipped
}
tset := make(TargetNodeSet)
WalkTopDown(NoEdgeContext{}, lg, func(lg *LicenseGraph, tn *TargetNode, path TargetEdgePath) bool {
if _, alreadyWalked := tset[tn]; alreadyWalked {
return false
}
if len(path) > 0 {
if !edgeIsDerivation(path[len(path)-1].edge) {
return false
}
}
tset[tn] = struct{}{}
return true
})
shipped = &tset
lg.mu.Lock()
if lg.shippedNodes == nil {
lg.shippedNodes = shipped
} else {
// if we end up with 2, release the later for garbage collection.
shipped = lg.shippedNodes
}
lg.mu.Unlock()
return *shipped
}