/
lister.go
100 lines (92 loc) · 2.69 KB
/
lister.go
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// Copyright 2023 CUE Labs AG
//
// 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 ociunify
import (
"context"
"errors"
"sort"
"strings"
"cuelabs.dev/go/oci/ociregistry"
)
func (u unifier) Repositories(ctx context.Context, startAfter string) ociregistry.Seq[string] {
r0, r1 := both(u, func(r ociregistry.Interface, _ int) ociregistry.Seq[string] {
return r.Repositories(ctx, startAfter)
})
return mergeIter(r0, r1, strings.Compare)
}
func (u unifier) Tags(ctx context.Context, repo, startAfter string) ociregistry.Seq[string] {
r0, r1 := both(u, func(r ociregistry.Interface, _ int) ociregistry.Seq[string] {
return r.Tags(ctx, repo, startAfter)
})
return mergeIter(r0, r1, strings.Compare)
}
func (u unifier) Referrers(ctx context.Context, repo string, digest ociregistry.Digest, artifactType string) ociregistry.Seq[ociregistry.Descriptor] {
r0, r1 := both(u, func(r ociregistry.Interface, _ int) ociregistry.Seq[ociregistry.Descriptor] {
return r.Referrers(ctx, repo, digest, artifactType)
})
return mergeIter(r0, r1, compareDescriptor)
}
func compareDescriptor(d0, d1 ociregistry.Descriptor) int {
return strings.Compare(string(d0.Digest), string(d1.Digest))
}
func mergeIter[T any](it0, it1 ociregistry.Seq[T], cmp func(T, T) int) ociregistry.Seq[T] {
// TODO streaming merge sort
xs0, err0 := ociregistry.All(it0)
xs1, err1 := ociregistry.All(it1)
if err0 != nil || err1 != nil {
notFound0 := errors.Is(err0, ociregistry.ErrNameUnknown)
notFound1 := errors.Is(err1, ociregistry.ErrNameUnknown)
if notFound0 && notFound1 {
return ociregistry.ErrorSeq[T](err0)
}
if notFound0 {
err0 = nil
}
if notFound1 {
err1 = nil
}
}
var xs []T
if len(xs0)+len(xs1) > 0 {
xs = make([]T, len(xs0)+len(xs1))
copy(xs, xs0)
copy(xs[len(xs0):], xs1)
sort.Slice(xs, func(i, j int) bool {
return cmp(xs[i], xs[j]) < 0
})
j := 0
for i := 1; i < len(xs); i++ {
if cmp(xs[i], xs[j]) != 0 {
j++
xs[j] = xs[i]
}
}
xs = xs[:j+1]
}
err := err0
if err == nil {
err = err1
}
if err == nil {
return ociregistry.SliceSeq(xs)
}
return func(yield func(T, error) bool) {
for _, x := range xs {
if !yield(x, nil) {
return
}
}
yield(*new(T), err)
}
}