package cache import ( "crypto/ecdsa" "sync" "time" clientcore "github.com/TrueCloudLab/frostfs-node/pkg/core/client" "github.com/TrueCloudLab/frostfs-sdk-go/client" ) type ( // ClientCache is a structure around frostfs-sdk-go/client to reuse // already created clients. ClientCache struct { mu sync.RWMutex clients map[string]*multiClient opts ClientCacheOpts } ClientCacheOpts struct { DialTimeout time.Duration StreamTimeout time.Duration Key *ecdsa.PrivateKey ResponseCallback func(client.ResponseMetaInfo) error AllowExternal bool } ) // NewSDKClientCache creates instance of client cache. // `opts` are used for new client creation. func NewSDKClientCache(opts ClientCacheOpts) *ClientCache { return &ClientCache{ clients: make(map[string]*multiClient), opts: opts, } } // Get function returns existing client or creates a new one. func (c *ClientCache) Get(info clientcore.NodeInfo) (clientcore.Client, error) { netAddr := info.AddressGroup() if c.opts.AllowExternal { netAddr = append(netAddr, info.ExternalAddressGroup()...) } cacheKey := string(info.PublicKey()) c.mu.RLock() if cli, ok := c.clients[cacheKey]; ok { c.mu.RUnlock() cli.updateGroup(netAddr) return cli, nil } c.mu.RUnlock() // if client is not found in cache, then create a new one c.mu.Lock() defer c.mu.Unlock() // check once again if client is missing in cache, concurrent routine could // create client while this routine was locked on `c.mu.Lock()`. if cli, ok := c.clients[cacheKey]; ok { // No need to update address group as the client has just been created. return cli, nil } newClientOpts := c.opts newClientOpts.ResponseCallback = clientcore.AssertKeyResponseCallback(info.PublicKey()) cli := newMultiClient(netAddr, newClientOpts) c.clients[cacheKey] = cli return cli, nil } // CloseAll closes underlying connections of all cached clients. // // Ignores closing errors. func (c *ClientCache) CloseAll() { c.mu.RLock() { for _, cl := range c.clients { _ = cl.Close() } } c.mu.RUnlock() }