| // Copyright 2023 The LUCI Authors. |
| // |
| // 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 graph contains methods to explore reachable invocations. |
| package graph |
| |
| import ( |
| "context" |
| "sync" |
| |
| "cloud.google.com/go/spanner" |
| "go.chromium.org/luci/resultdb/internal/invocations" |
| "go.chromium.org/luci/resultdb/internal/spanutil" |
| "go.chromium.org/luci/server/span" |
| "golang.org/x/sync/errgroup" |
| "golang.org/x/sync/semaphore" |
| ) |
| |
| // FindInheritSourcesDescendants finds and return all invocations (including the root) |
| // which inherit commit source information from the root. |
| func FindInheritSourcesDescendants(ctx context.Context, invID invocations.ID) (invocations.IDSet, error) { |
| ctx, cancel := span.ReadOnlyTransaction(ctx) |
| defer cancel() |
| |
| // Walk the graph of invocations, starting from the root, along the inclusion |
| // edges. |
| seen := make(invocations.IDSet, 1) |
| var mu sync.Mutex |
| |
| // Limit the number of concurrent queries. |
| sem := semaphore.NewWeighted(64) |
| |
| eg, ctx := errgroup.WithContext(ctx) |
| |
| var visit func(id invocations.ID) |
| visit = func(id invocations.ID) { |
| // Do not visit same node twice. |
| mu.Lock() |
| if seen.Has(id) { |
| mu.Unlock() |
| return |
| } |
| seen.Add(id) |
| mu.Unlock() |
| |
| // Concurrently fetch inclusions without a lock. |
| eg.Go(func() error { |
| // Limit concurrent Spanner queries. |
| if err := sem.Acquire(ctx, 1); err != nil { |
| return err |
| } |
| defer sem.Release(1) |
| |
| st := spanner.NewStatement(` |
| SELECT included.InvocationId |
| FROM IncludedInvocations incl |
| JOIN Invocations included on incl.IncludedInvocationId = included.InvocationId |
| WHERE incl.InvocationId = @invID AND included.InheritSources |
| `) |
| st.Params = spanutil.ToSpannerMap(map[string]any{"invID": id}) |
| var b spanutil.Buffer |
| return span.Query(ctx, st).Do(func(row *spanner.Row) error { |
| var includedID invocations.ID |
| if err := b.FromSpanner(row, &includedID); err != nil { |
| return err |
| } |
| visit(includedID) |
| return nil |
| }) |
| }) |
| } |
| |
| visit(invID) |
| |
| if err := eg.Wait(); err != nil { |
| return nil, err |
| } |
| return seen, nil |
| } |