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Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| /* | ||
| Copyright 2020 The Compose Specification 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 | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
|
|
||
| "github.com/compose-spec/compose-go/v2/types" | ||
| ) | ||
|
|
||
| // InDependencyOrder walk the service graph an invoke VisitorFn in respect to dependency order | ||
| func InDependencyOrder(ctx context.Context, project *types.Project, fn VisitorFn[types.ServiceConfig], options ...func(*Options)) error { | ||
| _, err := CollectInDependencyOrder[any](ctx, project, func(ctx context.Context, s string, config types.ServiceConfig) (any, error) { | ||
| return nil, fn(ctx, s, config) | ||
| }, options...) | ||
| return err | ||
| } | ||
|
|
||
| // CollectInDependencyOrder walk the service graph an invoke CollectorFn in respect to dependency order, then return result for each call | ||
| func CollectInDependencyOrder[T any](ctx context.Context, project *types.Project, fn CollectorFn[types.ServiceConfig, T], options ...func(*Options)) (map[string]T, error) { | ||
| graph, err := newGraph(project) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| t := newTraversal(fn) | ||
| for _, option := range options { | ||
| option(t.Options) | ||
| } | ||
| err = walk(ctx, graph, t) | ||
| return t.results, err | ||
| } | ||
|
|
||
| // newGraph creates a service graph from project | ||
| func newGraph(project *types.Project) (*graph[types.ServiceConfig], error) { | ||
| g := &graph[types.ServiceConfig]{ | ||
| vertices: map[string]*vertex[types.ServiceConfig]{}, | ||
| } | ||
|
|
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| for name, s := range project.Services { | ||
| g.addVertex(name, s) | ||
| } | ||
|
|
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| for name, s := range project.Services { | ||
| src := g.vertices[name] | ||
| for dep, condition := range s.DependsOn { | ||
| dest, ok := g.vertices[dep] | ||
| if !ok { | ||
| if condition.Required { | ||
| if ds, exists := project.DisabledServices[dep]; exists { | ||
| return nil, fmt.Errorf("service %q is required by %q but is disabled. Can be enabled by profiles %s", dep, name, ds.Profiles) | ||
| } | ||
| return nil, fmt.Errorf("service %q depends on unknown service %q", name, dep) | ||
| } | ||
| delete(s.DependsOn, name) | ||
| project.Services[name] = s | ||
| continue | ||
| } | ||
| src.children[dep] = dest | ||
| dest.parents[name] = src | ||
| } | ||
| } | ||
|
|
||
| err := g.checkCycle() | ||
| return g, err | ||
| } |
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