feat: kubesphere 4.0 (#6115)

* feat: kubesphere 4.0

Signed-off-by: ci-bot <ci-bot@kubesphere.io>

* feat: kubesphere 4.0

Signed-off-by: ci-bot <ci-bot@kubesphere.io>

---------

Signed-off-by: ci-bot <ci-bot@kubesphere.io>
Co-authored-by: ks-ci-bot <ks-ci-bot@example.com>
Co-authored-by: joyceliu <joyceliu@yunify.com>

vendor/google.golang.org/grpc/picker_wrapper.go

@@ -28,31 +28,31 @@ import (
 	"google.golang.org/grpc/internal/channelz"
 	istatus "google.golang.org/grpc/internal/status"
 	"google.golang.org/grpc/internal/transport"
+	"google.golang.org/grpc/stats"
 	"google.golang.org/grpc/status"
 )
 
 // pickerWrapper is a wrapper of balancer.Picker. It blocks on certain pick
 // actions and unblock when there's a picker update.
 type pickerWrapper struct {
-	mu         sync.Mutex
-	done       bool
-	idle       bool
-	blockingCh chan struct{}
-	picker     balancer.Picker
+	mu            sync.Mutex
+	done          bool
+	blockingCh    chan struct{}
+	picker        balancer.Picker
+	statsHandlers []stats.Handler // to record blocking picker calls
 }
 
-func newPickerWrapper() *pickerWrapper {
-	return &pickerWrapper{blockingCh: make(chan struct{})}
+func newPickerWrapper(statsHandlers []stats.Handler) *pickerWrapper {
+	return &pickerWrapper{
+		blockingCh:    make(chan struct{}),
+		statsHandlers: statsHandlers,
+	}
 }
 
 // updatePicker is called by UpdateBalancerState. It unblocks all blocked pick.
 func (pw *pickerWrapper) updatePicker(p balancer.Picker) {
 	pw.mu.Lock()
-	if pw.done || pw.idle {
-		// There is a small window where a picker update from the LB policy can
-		// race with the channel going to idle mode. If the picker is idle here,
-		// it is because the channel asked it to do so, and therefore it is sage
-		// to ignore the update from the LB policy.
+	if pw.done {
 		pw.mu.Unlock()
 		return
 	}
@@ -95,6 +95,7 @@ func (pw *pickerWrapper) pick(ctx context.Context, failfast bool, info balancer.
 	var ch chan struct{}
 
 	var lastPickErr error
+
 	for {
 		pw.mu.Lock()
 		if pw.done {
@@ -129,6 +130,20 @@ func (pw *pickerWrapper) pick(ctx context.Context, failfast bool, info balancer.
 			continue
 		}
 
+		// If the channel is set, it means that the pick call had to wait for a
+		// new picker at some point. Either it's the first iteration and this
+		// function received the first picker, or a picker errored with
+		// ErrNoSubConnAvailable or errored with failfast set to false, which
+		// will trigger a continue to the next iteration. In the first case this
+		// conditional will hit if this call had to block (the channel is set).
+		// In the second case, the only way it will get to this conditional is
+		// if there is a new picker.
+		if ch != nil {
+			for _, sh := range pw.statsHandlers {
+				sh.HandleRPC(ctx, &stats.PickerUpdated{})
+			}
+		}
+
 		ch = pw.blockingCh
 		p := pw.picker
 		pw.mu.Unlock()
@@ -190,23 +205,15 @@ func (pw *pickerWrapper) close() {
 	close(pw.blockingCh)
 }
 
-func (pw *pickerWrapper) enterIdleMode() {
-	pw.mu.Lock()
-	defer pw.mu.Unlock()
-	if pw.done {
-		return
-	}
-	pw.idle = true
-}
-
-func (pw *pickerWrapper) exitIdleMode() {
+// reset clears the pickerWrapper and prepares it for being used again when idle
+// mode is exited.
+func (pw *pickerWrapper) reset() {
 	pw.mu.Lock()
 	defer pw.mu.Unlock()
 	if pw.done {
 		return
 	}
 	pw.blockingCh = make(chan struct{})
-	pw.idle = false
 }
 
 // dropError is a wrapper error that indicates the LB policy wishes to drop the