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region_uc_v4.go
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region_uc_v4.go
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package storage
import (
"context"
"encoding/json"
"fmt"
"math"
"os"
"path/filepath"
"sync"
"time"
"golang.org/x/sync/singleflight"
"github.com/qiniu/go-sdk/v7/storagev2/apis"
"github.com/qiniu/go-sdk/v7/storagev2/apis/query_bucket_v4"
)
var ucQueryV4Group singleflight.Group
type regionV4CacheValue struct {
Regions []*Region `json:"regions"`
Deadline time.Time `json:"deadline"`
}
func (r *regionV4CacheValue) getRegions() []*Region {
if r == nil {
return nil
}
return r.Regions
}
type regionV4CacheMap map[string]regionV4CacheValue
const regionV4CacheFileName = "query_v4_00.cache.json"
var (
regionV4CachePath = filepath.Join(os.TempDir(), "qiniu-golang-sdk", regionV4CacheFileName)
regionV4Cache sync.Map
regionV4CacheLock sync.RWMutex
regionV4CacheSyncLock sync.Mutex
regionV4CacheLoaded bool = false
)
func setRegionV4CachePath(newPath string) {
cacheDir := filepath.Dir(newPath)
if len(cacheDir) == 0 {
return
}
regionV4CacheLock.Lock()
defer regionV4CacheLock.Unlock()
regionV4CachePath = filepath.Join(cacheDir, regionV4CacheFileName)
regionV4CacheLoaded = false
}
func loadRegionV4Cache() {
cacheFile, err := os.Open(regionV4CachePath)
if err != nil {
return
}
defer cacheFile.Close()
var cacheMap regionV4CacheMap
if err = json.NewDecoder(cacheFile).Decode(&cacheMap); err != nil {
return
}
for cacheKey, cacheValue := range cacheMap {
regionV4Cache.Store(cacheKey, cacheValue)
}
}
func storeRegionV4Cache() {
err := os.MkdirAll(filepath.Dir(regionV4CachePath), 0700)
if err != nil {
return
}
cacheFile, err := os.OpenFile(regionV4CachePath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
if err != nil {
return
}
defer cacheFile.Close()
cacheMap := make(regionV4CacheMap)
regionV4Cache.Range(func(cacheKey, cacheValue interface{}) bool {
cacheMap[cacheKey.(string)] = cacheValue.(regionV4CacheValue)
return true
})
if err = json.NewEncoder(cacheFile).Encode(cacheMap); err != nil {
return
}
}
func getRegionByV4(ak, bucket string, options UCApiOptions) (*RegionGroup, error) {
regionV4CacheLock.RLock()
if regionV4CacheLoaded {
regionV4CacheLock.RUnlock()
} else {
regionV4CacheLock.RUnlock()
func() {
regionV4CacheLock.Lock()
defer regionV4CacheLock.Unlock()
if !regionV4CacheLoaded {
loadRegionV4Cache()
regionV4CacheLoaded = true
}
}()
}
regionCacheKey := makeRegionCacheKey(ak, bucket, options.Hosts)
// check from cache
if v, ok := regionV4Cache.Load(regionCacheKey); ok && time.Now().Before(v.(regionV4CacheValue).Deadline) {
cacheValue, _ := v.(regionV4CacheValue)
return NewRegionGroup(cacheValue.getRegions()...), nil
}
newRegion, err, _ := ucQueryV4Group.Do(regionCacheKey, func() (interface{}, error) {
regions, ttl, err := _getRegionByV4WithoutCache(ak, bucket, options)
if err != nil {
return nil, fmt.Errorf("query region error, %s", err.Error())
}
regionV4Cache.Store(regionCacheKey, regionV4CacheValue{
Regions: regions,
Deadline: time.Now().Add(time.Duration(ttl) * time.Second),
})
regionV4CacheSyncLock.Lock()
defer regionV4CacheSyncLock.Unlock()
storeRegionV4Cache()
return NewRegionGroup(regions...), nil
})
if newRegion == nil {
return nil, err
}
return newRegion.(*RegionGroup), err
}
func _getRegionByV4WithoutCache(ak, bucket string, options UCApiOptions) ([]*Region, int64, error) {
toRegion := func(r *query_bucket_v4.BucketQueryHost) *Region {
var rsHost, rsfHost, apiHost, ioVipHost, ioSrcHost string
upDomains := append(r.UpDomains.PreferedUpDomains, r.UpDomains.AlternativeUpDomains...)
if len(r.RsDomains.PreferedRsDomains) > 0 {
rsHost = r.RsDomains.PreferedRsDomains[0]
}
if len(r.RsfDomains.PreferedRsfDomains) > 0 {
rsfHost = r.RsfDomains.PreferedRsfDomains[0]
}
if len(r.ApiDomains.PreferedApiDomains) > 0 {
apiHost = r.ApiDomains.PreferedApiDomains[0]
}
if len(r.IoDomains.PreferedIoDomains) > 0 {
ioVipHost = r.IoDomains.PreferedIoDomains[0]
}
if len(r.IoSrcDomains.PreferedIoSrcDomains) > 0 {
ioSrcHost = r.IoSrcDomains.PreferedIoSrcDomains[0]
}
return &Region{
SrcUpHosts: upDomains,
CdnUpHosts: upDomains,
RsHost: rsHost,
RsfHost: rsfHost,
ApiHost: apiHost,
IovipHost: ioVipHost,
IoSrcHost: ioSrcHost,
}
}
response, err := options.getApiStorageClient().QueryBucketV4(
context.Background(),
&apis.QueryBucketV4Request{
Bucket: bucket,
AccessKey: ak,
},
options.getApiOptions(),
)
if err != nil {
return nil, 0, err
}
regions := make([]*Region, 0, len(response.Hosts))
var ttl int64 = math.MaxInt64
for _, host := range response.Hosts {
regions = append(regions, toRegion(&host))
if ttl > host.TimeToLive {
ttl = host.TimeToLive
}
}
return regions, ttl, nil
}