forked from TrueCloudLab/frostfs-node
95 lines
2.4 KiB
Go
95 lines
2.4 KiB
Go
package cache
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import (
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"crypto/ecdsa"
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"encoding/hex"
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"sync"
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"time"
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clientcore "github.com/nspcc-dev/neofs-node/pkg/core/client"
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"github.com/nspcc-dev/neofs-node/pkg/network"
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"github.com/nspcc-dev/neofs-sdk-go/client"
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)
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type (
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// ClientCache is a structure around neofs-sdk-go/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]clientcore.Client
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opts ClientCacheOpts
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}
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ClientCacheOpts struct {
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DialTimeout time.Duration
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Key *ecdsa.PrivateKey
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ResponseCallback func(client.ResponseMetaInfo) error
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}
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)
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// NewSDKClientCache creates instance of client cache.
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// `opts` are used for new client creation.
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func NewSDKClientCache(opts ClientCacheOpts) *ClientCache {
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return &ClientCache{
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mu: new(sync.RWMutex),
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clients: make(map[string]clientcore.Client),
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opts: opts,
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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(info clientcore.NodeInfo) (clientcore.Client, error) {
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netAddr := info.AddressGroup()
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// multiaddr is used as a key in client cache since
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// same host may have different connections(with tls or not),
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// therefore, host+port pair is not unique
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// FIXME: #1157 we should calculate map key regardless of the address order,
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// but network.StringifyGroup is order-dependent.
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// This works until the same mixed group is transmitted
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// (for a network map, it seems to be true).
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cacheKey := hex.EncodeToString(info.PublicKey()) + network.StringifyGroup(netAddr)
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c.mu.RLock()
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if cli, ok := c.clients[cacheKey]; 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[cacheKey]; ok {
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return cli, nil
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}
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newClientOpts := c.opts
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newClientOpts.ResponseCallback = clientcore.AssertKeyResponseCallback(info.PublicKey())
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cli := newMultiClient(netAddr, newClientOpts)
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c.clients[cacheKey] = cli
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return cli, nil
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}
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// CloseAll closes underlying connections of all cached clients.
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//
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// Ignores closing errors.
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func (c *ClientCache) CloseAll() {
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c.mu.RLock()
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{
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for _, cl := range c.clients {
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_ = cl.Close()
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}
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}
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c.mu.RUnlock()
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}
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