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ipfs_keystore.go
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ipfs_keystore.go
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package repo
import (
"gx/ipfs/QmYVXrKrKHDC9FobgmcmshCDyWwdrfwfanNQN4oxJ9Fk3h/go-libp2p-peer"
"sync"
"time"
"github.com/ipfs/go-ipfs/core"
"github.com/phoreproject/pm-go/ipfs"
)
var (
getObjectFromIPFSCache = map[string]getObjectFromIPFSCacheEntry{}
getObjectFromIPFSCacheMu = sync.Mutex{}
)
type getObjectFromIPFSCacheEntry struct {
bytes []byte
created time.Time
}
// GetObjectFromIPFS gets the requested name from ipfs or the local cache
func GetObjectFromIPFS(n *core.IpfsNode, p peer.ID, name string, maxCacheLen time.Duration) ([]byte, error) {
getObjectFromIPFSCacheMu.Lock()
defer getObjectFromIPFSCacheMu.Unlock()
fetchAndUpdateCache := func() ([]byte, error) {
objBytes, err := fetchObjectFromIPFS(n, p, name)
if err != nil {
return nil, err
}
getObjectFromIPFSCache[getIPFSCacheKey(p, name)] = getObjectFromIPFSCacheEntry{
bytes: objBytes,
created: time.Now(),
}
return objBytes, nil
}
entry, ok := getObjectFromIPFSCache[getIPFSCacheKey(p, name)]
if !ok || entry.created.Add(maxCacheLen).Before(time.Now()) {
return fetchAndUpdateCache()
}
// Update cache in background after a successful read
go func() {
getObjectFromIPFSCacheMu.Lock()
defer getObjectFromIPFSCacheMu.Unlock()
_, err := fetchAndUpdateCache()
if err != nil {
log.Error(err)
}
}()
return entry.bytes, nil
}
// fetchObjectFromIPFS gets the requested object from ipfs
func fetchObjectFromIPFS(n *core.IpfsNode, p peer.ID, name string) ([]byte, error) {
root, err := ipfs.ResolveAltRoot(n, p, name, time.Minute)
if err != nil {
return nil, err
}
bytes, err := ipfs.Cat(n, root, time.Minute)
if err != nil {
return nil, err
}
return bytes, nil
}
func getIPFSCacheKey(p peer.ID, name string) string {
return p.Pretty() + "|" + name
}