Remove unused depgraph package
This commit is contained in:
James Nugent
parent
5194eb4e28
commit
c593bf3722
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@ -1,46 +0,0 @@
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package depgraph
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import (
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"fmt"
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"github.com/hashicorp/terraform/digraph"
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)
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// Dependency is used to create a directed edge between two nouns.
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// One noun may depend on another and provide version constraints
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// that cannot be violated
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type Dependency struct {
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Name string
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Meta interface{}
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Constraints []Constraint
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Source *Noun
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Target *Noun
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}
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// Constraint is used by dependencies to allow arbitrary constraints
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// between nouns
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type Constraint interface {
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Satisfied(head, tail *Noun) (bool, error)
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}
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// Head returns the source, or dependent noun
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func (d *Dependency) Head() digraph.Node {
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return d.Source
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}
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// Tail returns the target, or depended upon noun
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func (d *Dependency) Tail() digraph.Node {
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return d.Target
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}
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func (d *Dependency) GoString() string {
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return fmt.Sprintf(
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"*Dependency{Name: %s, Source: %s, Target: %s}",
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d.Name,
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d.Source.Name,
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d.Target.Name)
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}
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func (d *Dependency) String() string {
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return d.Name
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}
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@ -1,379 +0,0 @@
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// The depgraph package is used to create and model a dependency graph
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// of nouns. Each noun can represent a service, server, application,
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// network switch, etc. Nouns can depend on other nouns, and provide
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// versioning constraints. Nouns can also have various meta data that
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// may be relevant to their construction or configuration.
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package depgraph
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import (
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"bytes"
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"fmt"
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"sort"
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"strings"
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"sync"
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"github.com/hashicorp/terraform/digraph"
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)
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// WalkFunc is the type used for the callback for Walk.
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type WalkFunc func(*Noun) error
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// Graph is used to represent a dependency graph.
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type Graph struct {
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Name string
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Meta interface{}
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Nouns []*Noun
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Root *Noun
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}
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// ValidateError implements the Error interface but provides
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// additional information on a validation error.
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type ValidateError struct {
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// If set, then the graph is missing a single root, on which
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// there are no depdendencies
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MissingRoot bool
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// Unreachable are nodes that could not be reached from
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// the root noun.
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Unreachable []*Noun
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// Cycles are groups of strongly connected nodes, which
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// form a cycle. This is disallowed.
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Cycles [][]*Noun
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}
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func (v *ValidateError) Error() string {
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var msgs []string
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if v.MissingRoot {
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msgs = append(msgs, "The graph has no single root")
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}
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for _, n := range v.Unreachable {
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msgs = append(msgs, fmt.Sprintf(
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"Unreachable node: %s", n.Name))
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}
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for _, c := range v.Cycles {
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cycleNodes := make([]string, len(c))
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for i, n := range c {
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cycleNodes[i] = n.Name
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}
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msgs = append(msgs, fmt.Sprintf(
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"Cycle: %s", strings.Join(cycleNodes, " -> ")))
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}
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for i, m := range msgs {
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msgs[i] = fmt.Sprintf("* %s", m)
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}
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return fmt.Sprintf(
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"The dependency graph is not valid:\n\n%s",
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strings.Join(msgs, "\n"))
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}
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// ConstraintError is used to return detailed violation
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// information from CheckConstraints
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type ConstraintError struct {
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Violations []*Violation
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}
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func (c *ConstraintError) Error() string {
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return fmt.Sprintf("%d constraint violations", len(c.Violations))
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}
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// Violation is used to pass along information about
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// a constraint violation
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type Violation struct {
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Source *Noun
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Target *Noun
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Dependency *Dependency
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Constraint Constraint
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Err error
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}
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func (v *Violation) Error() string {
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return fmt.Sprintf("Constraint %v between %v and %v violated: %v",
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v.Constraint, v.Source, v.Target, v.Err)
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}
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// CheckConstraints walks the graph and ensures that all
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// user imposed constraints are satisfied.
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func (g *Graph) CheckConstraints() error {
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// Ensure we have a root
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if g.Root == nil {
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return fmt.Errorf("Graph must be validated before checking constraint violations")
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}
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// Create a constraint error
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cErr := &ConstraintError{}
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// Walk from the root
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digraph.DepthFirstWalk(g.Root, func(n digraph.Node) bool {
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noun := n.(*Noun)
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for _, dep := range noun.Deps {
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target := dep.Target
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for _, constraint := range dep.Constraints {
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ok, err := constraint.Satisfied(noun, target)
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if ok {
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continue
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}
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violation := &Violation{
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Source: noun,
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Target: target,
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Dependency: dep,
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Constraint: constraint,
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Err: err,
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}
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cErr.Violations = append(cErr.Violations, violation)
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}
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}
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return true
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})
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if cErr.Violations != nil {
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return cErr
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}
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return nil
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}
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// Noun returns the noun with the given name, or nil if it cannot be found.
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func (g *Graph) Noun(name string) *Noun {
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for _, n := range g.Nouns {
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if n.Name == name {
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return n
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}
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}
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return nil
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}
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// String generates a little ASCII string of the graph, useful in
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// debugging output.
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func (g *Graph) String() string {
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var buf bytes.Buffer
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// Alphabetize the output based on the noun name
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keys := make([]string, 0, len(g.Nouns))
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mapping := make(map[string]*Noun)
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for _, n := range g.Nouns {
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mapping[n.Name] = n
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keys = append(keys, n.Name)
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}
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sort.Strings(keys)
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if g.Root != nil {
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buf.WriteString(fmt.Sprintf("root: %s\n", g.Root.Name))
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} else {
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buf.WriteString("root: <unknown>\n")
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}
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for _, k := range keys {
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n := mapping[k]
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buf.WriteString(fmt.Sprintf("%s\n", n.Name))
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// Alphabetize the dependency names
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depKeys := make([]string, 0, len(n.Deps))
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depMapping := make(map[string]*Dependency)
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for _, d := range n.Deps {
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depMapping[d.Target.Name] = d
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depKeys = append(depKeys, d.Target.Name)
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}
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sort.Strings(depKeys)
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for _, k := range depKeys {
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dep := depMapping[k]
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buf.WriteString(fmt.Sprintf(
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" %s -> %s\n",
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dep.Source,
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dep.Target))
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}
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}
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return buf.String()
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}
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// Validate is used to ensure that a few properties of the graph are not violated:
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// 1) There must be a single "root", or source on which nothing depends.
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// 2) All nouns in the graph must be reachable from the root
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// 3) The graph must be cycle free, meaning there are no cicular dependencies
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func (g *Graph) Validate() error {
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// Convert to node list
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nodes := make([]digraph.Node, len(g.Nouns))
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for i, n := range g.Nouns {
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nodes[i] = n
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}
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// Create a validate erro
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vErr := &ValidateError{}
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// Search for all the sources, if we have only 1, it must be the root
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if sources := digraph.Sources(nodes); len(sources) != 1 {
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vErr.MissingRoot = true
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goto CHECK_CYCLES
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} else {
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g.Root = sources[0].(*Noun)
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}
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// Check reachability
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if unreached := digraph.Unreachable(g.Root, nodes); len(unreached) > 0 {
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vErr.Unreachable = make([]*Noun, len(unreached))
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for i, u := range unreached {
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vErr.Unreachable[i] = u.(*Noun)
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}
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}
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CHECK_CYCLES:
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// Check for cycles
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if cycles := digraph.StronglyConnectedComponents(nodes, true); len(cycles) > 0 {
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vErr.Cycles = make([][]*Noun, len(cycles))
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for i, cycle := range cycles {
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group := make([]*Noun, len(cycle))
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for j, n := range cycle {
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group[j] = n.(*Noun)
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}
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vErr.Cycles[i] = group
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}
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}
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// Check for loops to yourself
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for _, n := range g.Nouns {
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for _, d := range n.Deps {
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if d.Source == d.Target {
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vErr.Cycles = append(vErr.Cycles, []*Noun{n})
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}
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}
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}
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// Return the detailed error
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if vErr.MissingRoot || vErr.Unreachable != nil || vErr.Cycles != nil {
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return vErr
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}
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return nil
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}
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// Walk will walk the tree depth-first (dependency first) and call
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// the callback.
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//
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// The callbacks will be called in parallel, so if you need non-parallelism,
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// then introduce a lock in your callback.
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func (g *Graph) Walk(fn WalkFunc) error {
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// Set so we don't callback for a single noun multiple times
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var seenMapL sync.RWMutex
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seenMap := make(map[*Noun]chan struct{})
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seenMap[g.Root] = make(chan struct{})
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// Keep track of what nodes errored.
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var errMapL sync.RWMutex
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errMap := make(map[*Noun]struct{})
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// Build the list of things to visit
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tovisit := make([]*Noun, 1, len(g.Nouns))
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tovisit[0] = g.Root
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// Spawn off all our goroutines to walk the tree
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errCh := make(chan error)
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for len(tovisit) > 0 {
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// Grab the current thing to use
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n := len(tovisit)
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current := tovisit[n-1]
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tovisit = tovisit[:n-1]
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// Go through each dependency and run that first
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for _, dep := range current.Deps {
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if _, ok := seenMap[dep.Target]; !ok {
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seenMapL.Lock()
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seenMap[dep.Target] = make(chan struct{})
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seenMapL.Unlock()
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tovisit = append(tovisit, dep.Target)
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}
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}
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// Spawn off a goroutine to execute our callback once
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// all our dependencies are satisfied.
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go func(current *Noun) {
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seenMapL.RLock()
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closeCh := seenMap[current]
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seenMapL.RUnlock()
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defer close(closeCh)
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// Wait for all our dependencies
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for _, dep := range current.Deps {
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seenMapL.RLock()
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ch := seenMap[dep.Target]
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seenMapL.RUnlock()
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// Wait for the dep to be run
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<-ch
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// Check if any dependencies errored. If so,
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// then return right away, we won't walk it.
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errMapL.RLock()
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_, errOk := errMap[dep.Target]
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errMapL.RUnlock()
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if errOk {
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return
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}
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}
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// Call our callback!
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if err := fn(current); err != nil {
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errMapL.Lock()
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errMap[current] = struct{}{}
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errMapL.Unlock()
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errCh <- err
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}
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}(current)
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}
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// Aggregate channel that is closed when all goroutines finish
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doneCh := make(chan struct{})
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go func() {
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defer close(doneCh)
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for _, ch := range seenMap {
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<-ch
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}
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}()
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// Wait for finish OR an error
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select {
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case <-doneCh:
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return nil
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case err := <-errCh:
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// Drain the error channel
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go func() {
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for _ = range errCh {
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// Nothing
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}
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}()
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// Wait for the goroutines to end
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<-doneCh
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close(errCh)
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return err
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}
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}
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// DependsOn returns the set of nouns that have a
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// dependency on a given noun. This can be used to find
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// the incoming edges to a noun.
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func (g *Graph) DependsOn(n *Noun) []*Noun {
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var incoming []*Noun
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OUTER:
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for _, other := range g.Nouns {
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if other == n {
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continue
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}
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for _, d := range other.Deps {
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if d.Target == n {
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incoming = append(incoming, other)
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continue OUTER
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}
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}
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}
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return incoming
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}
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@ -1,467 +0,0 @@
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package depgraph
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import (
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"fmt"
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"reflect"
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"sort"
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"strings"
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"sync"
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"testing"
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)
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// ParseNouns is used to parse a string in the format of:
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// a -> b ; edge name
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// b -> c
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// Into a series of nouns and dependencies
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func ParseNouns(s string) map[string]*Noun {
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lines := strings.Split(s, "\n")
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nodes := make(map[string]*Noun)
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for _, line := range lines {
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var edgeName string
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if idx := strings.Index(line, ";"); idx >= 0 {
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edgeName = strings.Trim(line[idx+1:], " \t\r\n")
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line = line[:idx]
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}
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parts := strings.SplitN(line, "->", 2)
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if len(parts) != 2 {
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continue
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}
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head_name := strings.Trim(parts[0], " \t\r\n")
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tail_name := strings.Trim(parts[1], " \t\r\n")
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head := nodes[head_name]
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if head == nil {
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head = &Noun{Name: head_name}
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nodes[head_name] = head
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}
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tail := nodes[tail_name]
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if tail == nil {
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tail = &Noun{Name: tail_name}
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nodes[tail_name] = tail
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}
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edge := &Dependency{
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Name: edgeName,
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Source: head,
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Target: tail,
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}
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head.Deps = append(head.Deps, edge)
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}
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return nodes
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}
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func NounMapToList(m map[string]*Noun) []*Noun {
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list := make([]*Noun, 0, len(m))
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for _, n := range m {
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list = append(list, n)
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}
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return list
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}
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func TestGraph_Noun(t *testing.T) {
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nodes := ParseNouns(`a -> b
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a -> c
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b -> d
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b -> e
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c -> d
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c -> e`)
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g := &Graph{
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Name: "Test",
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Nouns: NounMapToList(nodes),
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}
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n := g.Noun("a")
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if n == nil {
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t.Fatal("should not be nil")
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}
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if n.Name != "a" {
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t.Fatalf("bad: %#v", n)
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}
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}
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func TestGraph_String(t *testing.T) {
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nodes := ParseNouns(`a -> b
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a -> c
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b -> d
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b -> e
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c -> d
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c -> e`)
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g := &Graph{
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Name: "Test",
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Nouns: NounMapToList(nodes),
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Root: nodes["a"],
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}
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actual := g.String()
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expected := `
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root: a
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a
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a -> b
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a -> c
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b
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b -> d
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b -> e
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c
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c -> d
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c -> e
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d
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e
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`
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actual = strings.TrimSpace(actual)
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expected = strings.TrimSpace(expected)
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if actual != expected {
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t.Fatalf("bad:\n%s\n!=\n%s", actual, expected)
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}
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}
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func TestGraph_Validate(t *testing.T) {
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||||
nodes := ParseNouns(`a -> b
|
||||
a -> c
|
||||
b -> d
|
||||
b -> e
|
||||
c -> d
|
||||
c -> e`)
|
||||
list := NounMapToList(nodes)
|
||||
|
||||
g := &Graph{Name: "Test", Nouns: list}
|
||||
if err := g.Validate(); err != nil {
|
||||
t.Fatalf("err: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
func TestGraph_Validate_Cycle(t *testing.T) {
|
||||
nodes := ParseNouns(`a -> b
|
||||
a -> c
|
||||
b -> d
|
||||
d -> b`)
|
||||
list := NounMapToList(nodes)
|
||||
|
||||
g := &Graph{Name: "Test", Nouns: list}
|
||||
err := g.Validate()
|
||||
if err == nil {
|
||||
t.Fatalf("expected err")
|
||||
}
|
||||
|
||||
vErr, ok := err.(*ValidateError)
|
||||
if !ok {
|
||||
t.Fatalf("expected validate error")
|
||||
}
|
||||
|
||||
if len(vErr.Cycles) != 1 {
|
||||
t.Fatalf("expected cycles")
|
||||
}
|
||||
|
||||
cycle := vErr.Cycles[0]
|
||||
cycleNodes := make([]string, len(cycle))
|
||||
for i, c := range cycle {
|
||||
cycleNodes[i] = c.Name
|
||||
}
|
||||
sort.Strings(cycleNodes)
|
||||
|
||||
if cycleNodes[0] != "b" {
|
||||
t.Fatalf("bad: %v", cycle)
|
||||
}
|
||||
if cycleNodes[1] != "d" {
|
||||
t.Fatalf("bad: %v", cycle)
|
||||
}
|
||||
}
|
||||
|
||||
func TestGraph_Validate_MultiRoot(t *testing.T) {
|
||||
nodes := ParseNouns(`a -> b
|
||||
c -> d`)
|
||||
list := NounMapToList(nodes)
|
||||
|
||||
g := &Graph{Name: "Test", Nouns: list}
|
||||
err := g.Validate()
|
||||
if err == nil {
|
||||
t.Fatalf("expected err")
|
||||
}
|
||||
|
||||
vErr, ok := err.(*ValidateError)
|
||||
if !ok {
|
||||
t.Fatalf("expected validate error")
|
||||
}
|
||||
|
||||
if !vErr.MissingRoot {
|
||||
t.Fatalf("expected missing root")
|
||||
}
|
||||
}
|
||||
|
||||
func TestGraph_Validate_NoRoot(t *testing.T) {
|
||||
nodes := ParseNouns(`a -> b
|
||||
b -> a`)
|
||||
list := NounMapToList(nodes)
|
||||
|
||||
g := &Graph{Name: "Test", Nouns: list}
|
||||
err := g.Validate()
|
||||
if err == nil {
|
||||
t.Fatalf("expected err")
|
||||
}
|
||||
|
||||
vErr, ok := err.(*ValidateError)
|
||||
if !ok {
|
||||
t.Fatalf("expected validate error")
|
||||
}
|
||||
|
||||
if !vErr.MissingRoot {
|
||||
t.Fatalf("expected missing root")
|
||||
}
|
||||
}
|
||||
|
||||
func TestGraph_Validate_Unreachable(t *testing.T) {
|
||||
nodes := ParseNouns(`a -> b
|
||||
a -> c
|
||||
b -> d
|
||||
x -> x`)
|
||||
list := NounMapToList(nodes)
|
||||
|
||||
g := &Graph{Name: "Test", Nouns: list}
|
||||
err := g.Validate()
|
||||
if err == nil {
|
||||
t.Fatalf("expected err")
|
||||
}
|
||||
|
||||
vErr, ok := err.(*ValidateError)
|
||||
if !ok {
|
||||
t.Fatalf("expected validate error")
|
||||
}
|
||||
|
||||
if len(vErr.Unreachable) != 1 {
|
||||
t.Fatalf("expected unreachable")
|
||||
}
|
||||
|
||||
if vErr.Unreachable[0].Name != "x" {
|
||||
t.Fatalf("bad: %v", vErr.Unreachable[0])
|
||||
}
|
||||
}
|
||||
|
||||
type VersionMeta int
|
||||
type VersionConstraint struct {
|
||||
Min int
|
||||
Max int
|
||||
}
|
||||
|
||||
func (v *VersionConstraint) Satisfied(head, tail *Noun) (bool, error) {
|
||||
vers := int(tail.Meta.(VersionMeta))
|
||||
if vers < v.Min {
|
||||
return false, fmt.Errorf("version %d below minimum %d",
|
||||
vers, v.Min)
|
||||
} else if vers > v.Max {
|
||||
return false, fmt.Errorf("version %d above maximum %d",
|
||||
vers, v.Max)
|
||||
}
|
||||
return true, nil
|
||||
}
|
||||
|
||||
func (v *VersionConstraint) String() string {
|
||||
return "version"
|
||||
}
|
||||
|
||||
func TestGraph_ConstraintViolation(t *testing.T) {
|
||||
nodes := ParseNouns(`a -> b
|
||||
a -> c
|
||||
b -> d
|
||||
b -> e
|
||||
c -> d
|
||||
c -> e`)
|
||||
list := NounMapToList(nodes)
|
||||
|
||||
// Add a version constraint
|
||||
vers := &VersionConstraint{1, 3}
|
||||
|
||||
// Introduce some constraints
|
||||
depB := nodes["a"].Deps[0]
|
||||
depB.Constraints = []Constraint{vers}
|
||||
depC := nodes["a"].Deps[1]
|
||||
depC.Constraints = []Constraint{vers}
|
||||
|
||||
// Add some versions
|
||||
nodes["b"].Meta = VersionMeta(0)
|
||||
nodes["c"].Meta = VersionMeta(4)
|
||||
|
||||
g := &Graph{Name: "Test", Nouns: list}
|
||||
err := g.Validate()
|
||||
if err != nil {
|
||||
t.Fatalf("err: %v", err)
|
||||
}
|
||||
|
||||
err = g.CheckConstraints()
|
||||
if err == nil {
|
||||
t.Fatalf("Expected err")
|
||||
}
|
||||
|
||||
cErr, ok := err.(*ConstraintError)
|
||||
if !ok {
|
||||
t.Fatalf("expected constraint error")
|
||||
}
|
||||
|
||||
if len(cErr.Violations) != 2 {
|
||||
t.Fatalf("expected 2 violations: %v", cErr)
|
||||
}
|
||||
|
||||
if cErr.Violations[0].Error() != "Constraint version between a and b violated: version 0 below minimum 1" {
|
||||
t.Fatalf("err: %v", cErr.Violations[0])
|
||||
}
|
||||
|
||||
if cErr.Violations[1].Error() != "Constraint version between a and c violated: version 4 above maximum 3" {
|
||||
t.Fatalf("err: %v", cErr.Violations[1])
|
||||
}
|
||||
}
|
||||
|
||||
func TestGraph_Constraint_NoViolation(t *testing.T) {
|
||||
nodes := ParseNouns(`a -> b
|
||||
a -> c
|
||||
b -> d
|
||||
b -> e
|
||||
c -> d
|
||||
c -> e`)
|
||||
list := NounMapToList(nodes)
|
||||
|
||||
// Add a version constraint
|
||||
vers := &VersionConstraint{1, 3}
|
||||
|
||||
// Introduce some constraints
|
||||
depB := nodes["a"].Deps[0]
|
||||
depB.Constraints = []Constraint{vers}
|
||||
depC := nodes["a"].Deps[1]
|
||||
depC.Constraints = []Constraint{vers}
|
||||
|
||||
// Add some versions
|
||||
nodes["b"].Meta = VersionMeta(2)
|
||||
nodes["c"].Meta = VersionMeta(3)
|
||||
|
||||
g := &Graph{Name: "Test", Nouns: list}
|
||||
err := g.Validate()
|
||||
if err != nil {
|
||||
t.Fatalf("err: %v", err)
|
||||
}
|
||||
|
||||
err = g.CheckConstraints()
|
||||
if err != nil {
|
||||
t.Fatalf("err: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
func TestGraphWalk(t *testing.T) {
|
||||
nodes := ParseNouns(`a -> b
|
||||
a -> c
|
||||
b -> d
|
||||
b -> e
|
||||
c -> d
|
||||
c -> e`)
|
||||
list := NounMapToList(nodes)
|
||||
g := &Graph{Name: "Test", Nouns: list}
|
||||
if err := g.Validate(); err != nil {
|
||||
t.Fatalf("err: %s", err)
|
||||
}
|
||||
|
||||
var namesLock sync.Mutex
|
||||
names := make([]string, 0, 0)
|
||||
err := g.Walk(func(n *Noun) error {
|
||||
namesLock.Lock()
|
||||
defer namesLock.Unlock()
|
||||
names = append(names, n.Name)
|
||||
return nil
|
||||
})
|
||||
if err != nil {
|
||||
t.Fatalf("err: %s", err)
|
||||
}
|
||||
|
||||
expected := [][]string{
|
||||
{"e", "d", "c", "b", "a"},
|
||||
{"e", "d", "b", "c", "a"},
|
||||
{"d", "e", "c", "b", "a"},
|
||||
{"d", "e", "b", "c", "a"},
|
||||
}
|
||||
found := false
|
||||
for _, expect := range expected {
|
||||
if reflect.DeepEqual(expect, names) {
|
||||
found = true
|
||||
break
|
||||
}
|
||||
}
|
||||
if !found {
|
||||
t.Fatalf("bad: %#v", names)
|
||||
}
|
||||
}
|
||||
|
||||
func TestGraphWalk_error(t *testing.T) {
|
||||
nodes := ParseNouns(`a -> b
|
||||
b -> c
|
||||
a -> d
|
||||
a -> e
|
||||
e -> f
|
||||
f -> g
|
||||
g -> h`)
|
||||
list := NounMapToList(nodes)
|
||||
g := &Graph{Name: "Test", Nouns: list}
|
||||
if err := g.Validate(); err != nil {
|
||||
t.Fatalf("err: %s", err)
|
||||
}
|
||||
|
||||
// We repeat this a lot because sometimes timing causes
|
||||
// a false positive.
|
||||
for i := 0; i < 100; i++ {
|
||||
var lock sync.Mutex
|
||||
var walked []string
|
||||
err := g.Walk(func(n *Noun) error {
|
||||
lock.Lock()
|
||||
defer lock.Unlock()
|
||||
|
||||
walked = append(walked, n.Name)
|
||||
|
||||
if n.Name == "b" {
|
||||
return fmt.Errorf("foo")
|
||||
}
|
||||
|
||||
return nil
|
||||
})
|
||||
if err == nil {
|
||||
t.Fatal("should error")
|
||||
}
|
||||
|
||||
sort.Strings(walked)
|
||||
|
||||
expected := []string{"b", "c", "d", "e", "f", "g", "h"}
|
||||
if !reflect.DeepEqual(walked, expected) {
|
||||
t.Fatalf("bad: %#v", walked)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestGraph_DependsOn(t *testing.T) {
|
||||
nodes := ParseNouns(`a -> b
|
||||
a -> c
|
||||
b -> d
|
||||
b -> e
|
||||
c -> d
|
||||
c -> e`)
|
||||
|
||||
g := &Graph{
|
||||
Name: "Test",
|
||||
Nouns: NounMapToList(nodes),
|
||||
}
|
||||
|
||||
dNoun := g.Noun("d")
|
||||
incoming := g.DependsOn(dNoun)
|
||||
|
||||
if len(incoming) != 2 {
|
||||
t.Fatalf("bad: %#v", incoming)
|
||||
}
|
||||
|
||||
var hasB, hasC bool
|
||||
for _, in := range incoming {
|
||||
switch in.Name {
|
||||
case "b":
|
||||
hasB = true
|
||||
case "c":
|
||||
hasC = true
|
||||
default:
|
||||
t.Fatalf("Bad: %#v", in)
|
||||
}
|
||||
}
|
||||
if !hasB || !hasC {
|
||||
t.Fatalf("missing incoming edge")
|
||||
}
|
||||
}
|
||||
|
|
@ -1,33 +0,0 @@
|
|||
package depgraph
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
|
||||
"github.com/hashicorp/terraform/digraph"
|
||||
)
|
||||
|
||||
// Nouns are the key structure of the dependency graph. They can
|
||||
// be used to represent all objects in the graph. They are linked
|
||||
// by depedencies.
|
||||
type Noun struct {
|
||||
Name string // Opaque name
|
||||
Meta interface{}
|
||||
Deps []*Dependency
|
||||
}
|
||||
|
||||
// Edges returns the out-going edges of a Noun
|
||||
func (n *Noun) Edges() []digraph.Edge {
|
||||
edges := make([]digraph.Edge, len(n.Deps))
|
||||
for idx, dep := range n.Deps {
|
||||
edges[idx] = dep
|
||||
}
|
||||
return edges
|
||||
}
|
||||
|
||||
func (n *Noun) GoString() string {
|
||||
return fmt.Sprintf("*%#v", *n)
|
||||
}
|
||||
|
||||
func (n *Noun) String() string {
|
||||
return n.Name
|
||||
}
|
||||
Loading…
Reference in New Issue