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|
package resource
import (
"fmt"
"log"
"sort"
)
type Applier interface {
Apply() error
}
type ApplierFunc func() error
func (f ApplierFunc) Apply() error {
return f()
}
type Resource struct {
Type string
Name string
applier Applier
dependsOn map[string]struct{}
}
func Register(type_, name string, apply Applier, deps ...string) Resource {
dependsOn := make(map[string]struct{}, len(deps))
for _, id := range deps {
dependsOn[id] = struct{}{}
}
r := Resource{
Type: type_,
Name: name,
applier: apply,
dependsOn: dependsOn,
}
if err := getRepository().register(r); err != nil {
log.Fatalf("resource registration failed: %v", err)
}
return r
}
func (r Resource) String() string {
return r.ID()
}
func (r Resource) ID() string {
return fmt.Sprintf("%s[%s]", r.Type, r.Name)
}
// Dependencies returns this resource's own ID. It lets a single Resource be
// used as a DependsOn target, mirroring Multi.Dependencies.
func (r Resource) Dependencies() []string {
return []string{r.ID()}
}
// sortedDependsOn returns the IDs this resource depends on, sorted for stable
// and readable log output.
func (r Resource) sortedDependsOn() []string {
ids := make([]string, 0, len(r.dependsOn))
for id := range r.dependsOn {
ids = append(ids, id)
}
sort.Strings(ids)
return ids
}
func (r Resource) Apply() error {
return r.applier.Apply()
}
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