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|
package result
import (
"maps"
"sync"
"github.com/pkg/errors"
)
type Result[T comparable] struct {
mu sync.Mutex
Ref T
Refs map[string]T
Metadata map[string][]byte
Attestations map[string][]Attestation[T]
}
func (r *Result[T]) Clone() *Result[T] {
return &Result[T]{
Ref: r.Ref,
Refs: maps.Clone(r.Refs),
Metadata: maps.Clone(r.Metadata),
Attestations: maps.Clone(r.Attestations),
}
}
func (r *Result[T]) AddMeta(k string, v []byte) {
r.mu.Lock()
if r.Metadata == nil {
r.Metadata = map[string][]byte{}
}
r.Metadata[k] = v
r.mu.Unlock()
}
func (r *Result[T]) AddRef(k string, ref T) {
r.mu.Lock()
if r.Refs == nil {
r.Refs = map[string]T{}
}
r.Refs[k] = ref
r.mu.Unlock()
}
func (r *Result[T]) AddAttestation(k string, v Attestation[T]) {
r.mu.Lock()
if r.Attestations == nil {
r.Attestations = map[string][]Attestation[T]{}
}
r.Attestations[k] = append(r.Attestations[k], v)
r.mu.Unlock()
}
func (r *Result[T]) SetRef(ref T) {
r.Ref = ref
}
func (r *Result[T]) SingleRef() (T, error) {
r.mu.Lock()
defer r.mu.Unlock()
var zero T
if r.Refs != nil && r.Ref == zero {
var t T
return t, errors.Errorf("invalid map result")
}
return r.Ref, nil
}
func (r *Result[T]) FindRef(key string) (T, bool) {
r.mu.Lock()
defer r.mu.Unlock()
if r.Refs != nil {
if ref, ok := r.Refs[key]; ok {
return ref, true
}
if len(r.Refs) == 1 {
for _, ref := range r.Refs {
return ref, true
}
}
var t T
return t, false
}
return r.Ref, true
}
func (r *Result[T]) EachRef(fn func(T) error) (err error) {
var zero T
if r.Ref != zero {
err = fn(r.Ref)
}
for _, r := range r.Refs {
if r != zero {
if err1 := fn(r); err1 != nil && err == nil {
err = err1
}
}
}
for _, as := range r.Attestations {
for _, a := range as {
if a.Ref != zero {
if err1 := fn(a.Ref); err1 != nil && err == nil {
err = err1
}
}
}
}
return err
}
// EachRef iterates over references in both a and b.
// a and b are assumed to be of the same size and map their references
// to the same set of keys
func EachRef[U comparable, V comparable](a *Result[U], b *Result[V], fn func(U, V) error) (err error) {
var (
zeroU U
zeroV V
)
if a.Ref != zeroU && b.Ref != zeroV {
err = fn(a.Ref, b.Ref)
}
for k, r := range a.Refs {
r2, ok := b.Refs[k]
if !ok {
continue
}
if r != zeroU && r2 != zeroV {
if err1 := fn(r, r2); err1 != nil && err == nil {
err = err1
}
}
}
for k, atts := range a.Attestations {
atts2, ok := b.Attestations[k]
if !ok {
continue
}
for i, att := range atts {
if i >= len(atts2) {
break
}
att2 := atts2[i]
if att.Ref != zeroU && att2.Ref != zeroV {
if err1 := fn(att.Ref, att2.Ref); err1 != nil && err == nil {
err = err1
}
}
}
}
return err
}
// ConvertResult transforms a Result[U] into a Result[V], using a transfomer
// function that converts a U to a V. Zero values of type U are converted to
// zero values of type V directly, without passing through the transformer
// function.
func ConvertResult[U comparable, V comparable](r *Result[U], fn func(U) (V, error)) (*Result[V], error) {
var zero U
r2 := &Result[V]{}
var err error
if r.Ref != zero {
r2.Ref, err = fn(r.Ref)
if err != nil {
return nil, err
}
}
if r.Refs != nil {
r2.Refs = map[string]V{}
}
for k, r := range r.Refs {
if r == zero {
var zero V
r2.Refs[k] = zero
continue
}
r2.Refs[k], err = fn(r)
if err != nil {
return nil, err
}
}
if r.Attestations != nil {
r2.Attestations = map[string][]Attestation[V]{}
}
for k, as := range r.Attestations {
for _, a := range as {
a2, err := ConvertAttestation(&a, fn)
if err != nil {
return nil, err
}
r2.Attestations[k] = append(r2.Attestations[k], *a2)
}
}
r2.Metadata = r.Metadata
return r2, nil
}
|
