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package solver
import (
"context"
"strings"
"sync"
"time"
digest "github.com/opencontainers/go-digest"
"github.com/pkg/errors"
"golang.org/x/sync/errgroup"
)
func NewCombinedCacheManager(cms []CacheManager, main CacheManager) CacheManager {
return &combinedCacheManager{cms: cms, main: main}
}
type combinedCacheManager struct {
cms []CacheManager
main CacheManager
id string
idOnce sync.Once
}
func (cm *combinedCacheManager) ID() string {
cm.idOnce.Do(func() {
ids := make([]string, len(cm.cms))
for i, c := range cm.cms {
ids[i] = c.ID()
}
cm.id = digest.FromBytes([]byte(strings.Join(ids, ","))).String()
})
return cm.id
}
func (cm *combinedCacheManager) Query(inp []CacheKeyWithSelector, inputIndex Index, dgst digest.Digest, outputIndex Index) ([]*CacheKey, error) {
eg, _ := errgroup.WithContext(context.TODO())
keys := make(map[string]*CacheKey, len(cm.cms))
var mu sync.Mutex
for _, c := range cm.cms {
func(c CacheManager) {
eg.Go(func() error {
recs, err := c.Query(inp, inputIndex, dgst, outputIndex)
if err != nil {
return err
}
mu.Lock()
for _, r := range recs {
if _, ok := keys[r.ID]; !ok || c == cm.main {
keys[r.ID] = r
}
}
mu.Unlock()
return nil
})
}(c)
}
if err := eg.Wait(); err != nil {
return nil, err
}
out := make([]*CacheKey, 0, len(keys))
for _, k := range keys {
out = append(out, k)
}
return out, nil
}
func (cm *combinedCacheManager) Load(ctx context.Context, rec *CacheRecord) (res Result, err error) {
results, err := rec.cacheManager.LoadWithParents(ctx, rec)
if err != nil {
return nil, err
}
defer func() {
ctx := context.WithoutCancel(ctx)
for i, res := range results {
if err == nil && i == 0 {
continue
}
res.Result.Release(ctx)
}
}()
if rec.cacheManager != cm.main && cm.main != nil {
for _, res := range results {
if _, err := cm.main.Save(res.CacheKey, res.Result, res.CacheResult.CreatedAt); err != nil {
return nil, err
}
}
}
if len(results) == 0 { // TODO: handle gracefully
return nil, errors.Errorf("failed to load deleted cache")
}
return results[0].Result, nil
}
func (cm *combinedCacheManager) Save(key *CacheKey, s Result, createdAt time.Time) (*ExportableCacheKey, error) {
if cm.main == nil {
return nil, nil
}
return cm.main.Save(key, s, createdAt)
}
func (cm *combinedCacheManager) Records(ctx context.Context, ck *CacheKey) ([]*CacheRecord, error) {
ck.mu.RLock()
if len(ck.ids) == 0 {
ck.mu.RUnlock()
return nil, errors.Errorf("no results")
}
cms := make([]*cacheManager, 0, len(ck.ids))
for cm := range ck.ids {
cms = append(cms, cm)
}
ck.mu.RUnlock()
records := map[string]*CacheRecord{}
var mu sync.Mutex
eg, _ := errgroup.WithContext(context.TODO())
for _, c := range cms {
c := c
eg.Go(func() error {
recs, err := c.Records(ctx, ck)
if err != nil {
return err
}
mu.Lock()
for _, rec := range recs {
if _, ok := records[rec.ID]; !ok || c == cm.main {
if c == cm.main {
rec.Priority = 1
}
records[rec.ID] = rec
}
}
mu.Unlock()
return nil
})
}
if err := eg.Wait(); err != nil {
return nil, err
}
out := make([]*CacheRecord, 0, len(records))
for _, rec := range records {
out = append(out, rec)
}
return out, nil
}
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