// +build local /* Copyright 2020 Docker Compose CLI 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 local import ( "context" "github.com/compose-spec/compose-go/types" "golang.org/x/sync/errgroup" ) func inDependencyOrder(ctx context.Context, project *types.Project, fn func(context.Context, types.ServiceConfig) error) error { var ( scheduled []string ready []string ) services := sortByDependency(project.Services) results := make(chan string) errors := make(chan error) eg, ctx := errgroup.WithContext(ctx) for len(ready) < len(services) { for _, service := range services { if contains(scheduled, service.Name) { continue } if containsAll(ready, service.GetDependencies()) { service := service scheduled = append(scheduled, service.Name) eg.Go(func() error { err := fn(ctx, service) if err != nil { errors <- err return err } results <- service.Name return nil }) } } select { case result := <-results: ready = append(ready, result) case err := <-errors: return err } } return eg.Wait() } // sortByDependency sort a Service slice so it can be processed in respect to dependency ordering func sortByDependency(services types.Services) types.Services { var sorted types.Services var done []string for len(sorted) < len(services) { for _, s := range services { if contains(done, s.Name) { continue } if containsAll(done, s.GetDependencies()) { sorted = append(sorted, s) done = append(done, s.Name) } } } return sorted }