fix: avoid timed value for network calls (#11531)

additionally simply timedValue to have RWMutex
to avoid concurrent calls to DiskInfo() getting
serialized, this has an effect on all calls that
use GetDiskInfo() on the same disks.

Such as getOnlineDisks, getOnlineDisksWithoutHealing

cmd/config-current.go

@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"context"
+	"crypto/tls"
 	"fmt"
 	"strings"
 	"sync"
@@ -295,7 +296,10 @@ func validateConfig(s config.Config, setDriveCounts []int) error {
 		}
 	}
 	{
-		kmsCfg, err := crypto.LookupConfig(s, globalCertsCADir.Get(), NewGatewayHTTPTransport())
+		kmsCfg, err := crypto.LookupConfig(s, globalCertsCADir.Get(), newCustomHTTPTransportWithHTTP2(
+			&tls.Config{
+				RootCAs: globalRootCAs,
+			}, defaultDialTimeout)())
 		if err != nil {
 			return err
 		}
@@ -471,7 +475,10 @@ func lookupConfigs(s config.Config, setDriveCounts []int) {
 		}
 	}
 
-	kmsCfg, err := crypto.LookupConfig(s, globalCertsCADir.Get(), NewGatewayHTTPTransport())
+	kmsCfg, err := crypto.LookupConfig(s, globalCertsCADir.Get(), newCustomHTTPTransportWithHTTP2(
+		&tls.Config{
+			RootCAs: globalRootCAs,
+		}, defaultDialTimeout)())
 	if err != nil {
 		logger.LogIf(ctx, fmt.Errorf("Unable to setup KMS config: %w", err))
 	}

cmd/storage-rest-client.go

@@ -29,7 +29,6 @@ import (
 	"strconv"
 	"strings"
 	"sync"
-	"time"
 
 	"github.com/minio/minio/cmd/http"
 	xhttp "github.com/minio/minio/cmd/http"
@@ -120,8 +119,6 @@ type storageRESTClient struct {
 	endpoint   Endpoint
 	restClient *rest.Client
 	diskID     string
-
-	diskInfoCache timedValue
 }
 
 // Wrapper to restClient.Call to handle network errors, in case of network error the connection is makred disconnected
@@ -218,10 +215,6 @@ func (client *storageRESTClient) SetDiskID(id string) {
 
 // DiskInfo - fetch disk information for a remote disk.
 func (client *storageRESTClient) DiskInfo(ctx context.Context) (info DiskInfo, err error) {
-	client.diskInfoCache.Once.Do(func() {
-		client.diskInfoCache.TTL = time.Second
-		client.diskInfoCache.Update = func() (interface{}, error) {
-			var info DiskInfo
 	respBody, err := client.call(ctx, storageRESTMethodDiskInfo, nil, nil, -1)
 	if err != nil {
 		return info, err
@@ -235,11 +228,6 @@ func (client *storageRESTClient) DiskInfo(ctx context.Context) (info DiskInfo, e
 	}
 	return info, nil
 }
-	})
-	v, err := client.diskInfoCache.Get()
-	info = v.(DiskInfo)
-	return info, err
-}
 
 // MakeVolBulk - create multiple volumes in a bulk operation.
 func (client *storageRESTClient) MakeVolBulk(ctx context.Context, volumes ...string) (err error) {

cmd/utils.go

@@ -45,6 +45,7 @@ import (
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/handlers"
 	"github.com/minio/minio/pkg/madmin"
+	"golang.org/x/net/http2"
 )
 
 const (
@@ -523,6 +524,45 @@ func newCustomHTTPProxyTransport(tlsConfig *tls.Config, dialTimeout time.Duratio
 	}
 }
 
+func newCustomHTTPTransportWithHTTP2(tlsConfig *tls.Config, dialTimeout time.Duration) func() *http.Transport {
+	// For more details about various values used here refer
+	// https://golang.org/pkg/net/http/#Transport documentation
+	tr := &http.Transport{
+		Proxy:                 http.ProxyFromEnvironment,
+		DialContext:           xhttp.DialContextWithDNSCache(globalDNSCache, xhttp.NewInternodeDialContext(dialTimeout)),
+		MaxIdleConnsPerHost:   1024,
+		IdleConnTimeout:       15 * time.Second,
+		ResponseHeaderTimeout: 1 * time.Minute,
+		TLSHandshakeTimeout:   10 * time.Second,
+		ExpectContinueTimeout: 10 * time.Second,
+		TLSClientConfig:       tlsConfig,
+		// Go net/http automatically unzip if content-type is
+		// gzip disable this feature, as we are always interested
+		// in raw stream.
+		DisableCompression: true,
+	}
+
+	if tlsConfig != nil {
+		trhttp2, _ := http2.ConfigureTransports(tr)
+		if trhttp2 != nil {
+			// ReadIdleTimeout is the timeout after which a health check using ping
+			// frame will be carried out if no frame is received on the
+			// connection. 5 minutes is sufficient time for any idle connection.
+			trhttp2.ReadIdleTimeout = 5 * time.Minute
+			// PingTimeout is the timeout after which the connection will be closed
+			// if a response to Ping is not received.
+			trhttp2.PingTimeout = dialTimeout
+			// DisableCompression, if true, prevents the Transport from
+			// requesting compression with an "Accept-Encoding: gzip"
+			trhttp2.DisableCompression = true
+		}
+	}
+
+	return func() *http.Transport {
+		return tr
+	}
+}
+
 func newCustomHTTPTransport(tlsConfig *tls.Config, dialTimeout time.Duration) func() *http.Transport {
 	// For more details about various values used here refer
 	// https://golang.org/pkg/net/http/#Transport documentation
@@ -767,38 +807,45 @@ type timedValue struct {
 	// Managed values.
 	value      interface{}
 	lastUpdate time.Time
-	mu         sync.Mutex
+	mu         sync.RWMutex
 }
 
 // Get will return a cached value or fetch a new one.
 // If the Update function returns an error the value is forwarded as is and not cached.
 func (t *timedValue) Get() (interface{}, error) {
-	t.mu.Lock()
+	v := t.get()
-	defer t.mu.Unlock()
+	if v != nil {
-	if t.TTL <= 0 {
-		t.TTL = time.Second
-	}
-	if t.value != nil {
-		if time.Since(t.lastUpdate) < t.TTL {
-			v := t.value
 		return v, nil
 	}
-		t.value = nil
+
-	}
 	v, err := t.Update()
 	if err != nil {
 		return v, err
 	}
-	t.value = v
+
-	t.lastUpdate = time.Now()
+	t.update(v)
 	return v, nil
 }
 
-// Invalidate the value in the cache.
+func (t *timedValue) get() (v interface{}) {
-func (t *timedValue) Invalidate() {
+	ttl := t.TTL
+	if ttl <= 0 {
+		ttl = time.Second
+	}
+	t.mu.RLock()
+	defer t.mu.RUnlock()
+	v = t.value
+	if time.Since(t.lastUpdate) < ttl {
+		return v
+	}
+	return nil
+}
+
+func (t *timedValue) update(v interface{}) {
 	t.mu.Lock()
-	t.value = nil
+	defer t.mu.Unlock()
-	t.mu.Unlock()
+	t.value = v
+	t.lastUpdate = time.Now()
 }
 
 // On MinIO a directory object is stored as a regular object with "__XLDIR__" suffix.