100 lines
2.2 KiB
Go
100 lines
2.2 KiB
Go
package tree
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import (
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"context"
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"errors"
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"fmt"
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"strings"
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"sync"
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"time"
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"github.com/hashicorp/golang-lru/simplelru"
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"github.com/nspcc-dev/neofs-node/pkg/network"
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"google.golang.org/grpc"
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"google.golang.org/grpc/connectivity"
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"google.golang.org/grpc/credentials/insecure"
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)
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type clientCache struct {
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sync.Mutex
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simplelru.LRU
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}
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type cacheItem struct {
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cc *grpc.ClientConn
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lastTry time.Time
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}
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const (
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defaultClientCacheSize = 10
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defaultClientConnectTimeout = time.Second * 2
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defaultReconnectInterval = time.Second * 15
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)
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var errRecentlyFailed = errors.New("client has recently failed")
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func (c *clientCache) init() {
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l, _ := simplelru.NewLRU(defaultClientCacheSize, func(key, value interface{}) {
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_ = value.(*grpc.ClientConn).Close()
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})
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c.LRU = *l
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}
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func (c *clientCache) get(ctx context.Context, netmapAddr string) (TreeServiceClient, error) {
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c.Lock()
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ccInt, ok := c.LRU.Get(netmapAddr)
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c.Unlock()
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if ok {
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item := ccInt.(cacheItem)
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if item.cc == nil {
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if d := time.Since(item.lastTry); d < defaultReconnectInterval {
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return nil, fmt.Errorf("%w: %s till the next reconnection to %s",
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errRecentlyFailed, d, netmapAddr)
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}
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} else {
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if s := item.cc.GetState(); s == connectivity.Idle || s == connectivity.Ready {
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return NewTreeServiceClient(item.cc), nil
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}
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_ = item.cc.Close()
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}
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}
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cc, err := dialTreeService(ctx, netmapAddr)
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lastTry := time.Now()
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c.Lock()
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if err != nil {
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c.LRU.Add(netmapAddr, cacheItem{cc: nil, lastTry: lastTry})
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} else {
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c.LRU.Add(netmapAddr, cacheItem{cc: cc, lastTry: lastTry})
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}
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c.Unlock()
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if err != nil {
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return nil, err
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}
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return NewTreeServiceClient(cc), nil
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}
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func dialTreeService(ctx context.Context, netmapAddr string) (*grpc.ClientConn, error) {
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var netAddr network.Address
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if err := netAddr.FromString(netmapAddr); err != nil {
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return nil, err
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}
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opts := make([]grpc.DialOption, 1, 2)
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opts[0] = grpc.WithBlock()
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// FIXME(@fyrchik): ugly hack #1322
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if !strings.HasPrefix(netAddr.URIAddr(), "grpcs:") {
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opts = append(opts, grpc.WithTransportCredentials(insecure.NewCredentials()))
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}
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ctx, cancel := context.WithTimeout(ctx, defaultClientConnectTimeout)
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cc, err := grpc.DialContext(ctx, netAddr.URIAddr(), opts...)
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cancel()
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return cc, err
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}
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