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package datastore
import (
"context"
"sync"
)
// LocalGenerationStore is an in-memory implementation of GenerationStore.
// Refer to the interface for method documentation.
type LocalGenerationStore struct {
m sync.Mutex
storages map[string][]string
generations map[string]map[string]map[string]int
repositories map[string]map[string]int
}
// NewLocalGenerationStore returns an in-memory implementation of GenerationStore.
func NewLocalGenerationStore(storages map[string][]string) *LocalGenerationStore {
return &LocalGenerationStore{
storages: storages,
generations: make(map[string]map[string]map[string]int),
repositories: make(map[string]map[string]int),
}
}
func (l *LocalGenerationStore) IncrementGeneration(ctx context.Context, virtualStorage, storage, relativePath string) (int, error) {
l.m.Lock()
defer l.m.Unlock()
nextGen := l.latestGeneration(virtualStorage, relativePath) + 1
l.setGeneration(virtualStorage, relativePath, storage, nextGen)
return nextGen, nil
}
func (l *LocalGenerationStore) SetGeneration(ctx context.Context, virtualStorage, storage, relativePath string, generation int) error {
l.m.Lock()
defer l.m.Unlock()
l.setGeneration(virtualStorage, relativePath, storage, generation)
return nil
}
func (l *LocalGenerationStore) DeleteRecord(ctx context.Context, virtualStorage, storage, relativePath string) error {
l.m.Lock()
defer l.m.Unlock()
vs, ok := l.generations[virtualStorage]
if !ok {
return nil
}
rel, ok := vs[relativePath]
if !ok {
return nil
}
delete(rel, storage)
return nil
}
func (l *LocalGenerationStore) EnsureUpgrade(ctx context.Context, virtualStorage, storage, relativePath string, generation int) error {
l.m.Lock()
defer l.m.Unlock()
if current := l.getGeneration(virtualStorage, relativePath, storage); current != GenerationUnknown && current >= generation {
return errDowngradeAttempted
}
return nil
}
func (l *LocalGenerationStore) GetOutdatedRepositories(ctx context.Context, virtualStorage string) (map[string]map[string]int, error) {
storages, ok := l.storages[virtualStorage]
if !ok {
return nil, errUnknownVirtualStorage
}
outdatedRepos := make(map[string]map[string]int)
repositories, ok := l.repositories[virtualStorage]
if !ok {
return outdatedRepos, nil
}
for relativePath, latestGeneration := range repositories {
for _, storage := range storages {
if gen := l.getGeneration(virtualStorage, relativePath, storage); gen < latestGeneration {
if outdatedRepos[relativePath] == nil {
outdatedRepos[relativePath] = make(map[string]int)
}
outdatedRepos[relativePath][storage] = latestGeneration - gen
}
}
}
return outdatedRepos, nil
}
func (l *LocalGenerationStore) latestGeneration(virtualStorage, relativePath string) int {
vs := l.repositories[virtualStorage]
if vs == nil {
return GenerationUnknown
}
if latest, ok := vs[relativePath]; ok {
return latest
}
return GenerationUnknown
}
func (l *LocalGenerationStore) getGeneration(virtualStorage, relativePath, storage string) int {
vs := l.generations[virtualStorage]
if vs == nil {
return GenerationUnknown
}
rel := vs[relativePath]
if rel == nil {
return GenerationUnknown
}
if gen, ok := rel[storage]; ok {
return gen
}
return GenerationUnknown
}
func (l *LocalGenerationStore) setGeneration(virtualStorage, relativePath, storage string, generation int) {
if generation > l.latestGeneration(virtualStorage, relativePath) {
if l.repositories[virtualStorage] == nil {
l.repositories[virtualStorage] = make(map[string]int)
}
l.repositories[virtualStorage][relativePath] = generation
}
vs := l.generations[virtualStorage]
if vs == nil {
l.generations[virtualStorage] = map[string]map[string]int{
relativePath: {
storage: generation,
},
}
return
}
rel := vs[relativePath]
if rel == nil {
vs[relativePath] = map[string]int{
storage: generation,
}
return
}
rel[storage] = generation
}
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