Golang Graph.Noun方法代碼示例

// nounAddVariableDeps updates the dependencies of a noun given
// a set of associated variable values
func nounAddVariableDeps(
	g *depgraph.Graph,
	n *depgraph.Noun,
	vars map[string]config.InterpolatedVariable,
	removeSelf bool) {
	for _, v := range vars {
		// Only resource variables impose dependencies
		rv, ok := v.(*config.ResourceVariable)
		if !ok {
			continue
		}

		// Find the target
		target := g.Noun(rv.ResourceId())
		if target == nil {
			continue
		}

		// If we're ignoring self-references, then don't add that
		// dependency.
		if removeSelf && n == target {
			continue
		}

		// Build the dependency
		dep := &depgraph.Dependency{
			Name:   rv.ResourceId(),
			Source: n,
			Target: target,
		}

		n.Deps = append(n.Deps, dep)
	}
}

// graphAddMissingResourceProviders adds GraphNodeResourceProvider nodes for
// the resources that do not have an explicit resource provider specified
// because no provider configuration was given.
func graphAddMissingResourceProviders(
	g *depgraph.Graph,
	ps map[string]ResourceProviderFactory) error {
	var errs []error

	for _, n := range g.Nouns {
		rn, ok := n.Meta.(*GraphNodeResource)
		if !ok {
			continue
		}
		if rn.ResourceProviderID != "" {
			continue
		}

		prefixes := matchingPrefixes(rn.Type, ps)
		if len(prefixes) == 0 {
			errs = append(errs, fmt.Errorf(
				"No matching provider for type: %s",
				rn.Type))
			continue
		}

		// The resource provider ID is simply the shortest matching
		// prefix, since that'll give us the most resource providers
		// to choose from.
		rn.ResourceProviderID = prefixes[len(prefixes)-1]

		// If we don't have a matching noun for this yet, insert it.
		pn := g.Noun(fmt.Sprintf("provider.%s", rn.ResourceProviderID))
		if pn == nil {
			pn = &depgraph.Noun{
				Name: fmt.Sprintf("provider.%s", rn.ResourceProviderID),
				Meta: &GraphNodeResourceProvider{
					ID:     rn.ResourceProviderID,
					Config: nil,
				},
			}
			g.Nouns = append(g.Nouns, pn)
		}

		// Add the provider configuration noun as a dependency
		dep := &depgraph.Dependency{
			Name:   pn.Name,
			Source: n,
			Target: pn,
		}
		n.Deps = append(n.Deps, dep)
	}

	if len(errs) > 0 {
		return &multierror.Error{Errors: errs}
	}

	return nil
}