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resolver.go
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resolver.go
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package container
import (
"context"
"fmt"
"sort"
"strings"
)
type resolveResult struct {
spec Spec
err error
}
type Resolver struct {
jobs int
queue chan resolveResult
ctx context.Context
Arch string
AuthFilePath string
}
type SourceSpec struct {
Source string
Name string
TLSVerify *bool
}
func NewResolver(arch string) Resolver {
return Resolver{
ctx: context.Background(),
queue: make(chan resolveResult, 2),
Arch: arch,
}
}
func (r *Resolver) Add(spec SourceSpec) {
client, err := NewClient(spec.Source)
r.jobs += 1
if err != nil {
r.queue <- resolveResult{err: err}
return
}
client.SetTLSVerify(spec.TLSVerify)
client.SetArchitectureChoice(r.Arch)
if r.AuthFilePath != "" {
client.SetAuthFilePath(r.AuthFilePath)
}
go func() {
spec, err := client.Resolve(r.ctx, spec.Name)
if err != nil {
err = fmt.Errorf("'%s': %w", spec.Source, err)
}
r.queue <- resolveResult{spec: spec, err: err}
}()
}
func (r *Resolver) Finish() ([]Spec, error) {
specs := make([]Spec, 0, r.jobs)
errs := make([]string, 0, r.jobs)
for r.jobs > 0 {
result := <-r.queue
r.jobs -= 1
if result.err == nil {
specs = append(specs, result.spec)
} else {
errs = append(errs, result.err.Error())
}
}
if len(errs) > 0 {
detail := strings.Join(errs, "; ")
return specs, fmt.Errorf("failed to resolve container: %s", detail)
}
// Return a stable result, sorted by Digest
sort.Slice(specs, func(i, j int) bool { return specs[i].Digest < specs[j].Digest })
return specs, nil
}