68 lines
1.5 KiB
Go
68 lines
1.5 KiB
Go
package cache
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import (
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"crypto/ecdsa"
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"crypto/sha256"
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"encoding/hex"
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"sync"
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"github.com/nspcc-dev/neofs-api-go/pkg/client"
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crypto "github.com/nspcc-dev/neofs-crypto"
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)
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type (
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// ClientCache is a structure around neofs-api-go/pkg/client to reuse
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// already created clients.
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ClientCache struct {
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mu *sync.RWMutex
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clients map[string]*client.Client
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}
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)
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// NewSDKClientCache creates instance of client cache.
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func NewSDKClientCache() *ClientCache {
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return &ClientCache{
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mu: new(sync.RWMutex),
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clients: make(map[string]*client.Client),
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}
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}
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// Get function returns existing client or creates a new one.
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func (c *ClientCache) Get(key *ecdsa.PrivateKey, address string, opts ...client.Option) (*client.Client, error) {
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id := uniqueID(key, address)
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c.mu.RLock()
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if cli, ok := c.clients[id]; ok {
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// todo: check underlying connection neofs-api-go#196
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c.mu.RUnlock()
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return cli, nil
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}
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c.mu.RUnlock()
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// if client is not found in cache, then create a new one
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c.mu.Lock()
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defer c.mu.Unlock()
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// check once again if client is missing in cache, concurrent routine could
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// create client while this routine was locked on `c.mu.Lock()`.
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if cli, ok := c.clients[id]; ok {
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return cli, nil
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}
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cli, err := client.New(key, append(opts, client.WithAddress(address))...)
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if err != nil {
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return nil, err
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}
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c.clients[id] = cli
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return cli, nil
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}
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func uniqueID(key *ecdsa.PrivateKey, address string) string {
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keyFingerprint := sha256.Sum256(crypto.MarshalPrivateKey(key))
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return hex.EncodeToString(keyFingerprint[:]) + address
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}
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