update kube and vendor dependencies

With kubernetes 1.18 release of client-go, signatures on methods in
generated clientsets, dynamic, metadata, and scale clients have been
modified to accept context.Context as a first argument.
Signatures of Create, Update, and Patch methods have been updated
to accept CreateOptions, UpdateOptions and PatchOptions respectively.
Signatures of Delete and DeleteCollection methods now accept
DeleteOptions by value instead of by reference.
These changes are now accommodated with this PR and client-go
and dependencies are updated to v1.18.0

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

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

@@ -203,11 +203,6 @@ type ConfigParser interface {
 	ParseConfig(LoadBalancingConfigJSON json.RawMessage) (serviceconfig.LoadBalancingConfig, error)
 }
 
-// PickOptions is a type alias of PickInfo for legacy reasons.
-//
-// Deprecated: use PickInfo instead.
-type PickOptions = PickInfo
-
 // PickInfo contains additional information for the Pick operation.
 type PickInfo struct {
 	// FullMethodName is the method name that NewClientStream() is called

vendor/google.golang.org/grpc/balancer/base/balancer.go

@@ -21,6 +21,7 @@ package base
 import (
 	"context"
 	"errors"
+	"fmt"
 
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/connectivity"
@@ -76,6 +77,9 @@ type baseBalancer struct {
 	picker   balancer.Picker
 	v2Picker balancer.V2Picker
 	config   Config
+
+	resolverErr error // the last error reported by the resolver; cleared on successful resolution
+	connErr     error // the last connection error; cleared upon leaving TransientFailure
 }
 
 func (b *baseBalancer) HandleResolvedAddrs(addrs []resolver.Address, err error) {
@@ -83,13 +87,23 @@ func (b *baseBalancer) HandleResolvedAddrs(addrs []resolver.Address, err error)
 }
 
 func (b *baseBalancer) ResolverError(err error) {
-	switch b.state {
-	case connectivity.TransientFailure, connectivity.Idle, connectivity.Connecting:
-		if b.picker != nil {
-			b.picker = NewErrPicker(err)
-		} else {
-			b.v2Picker = NewErrPickerV2(err)
-		}
+	b.resolverErr = err
+	if len(b.subConns) == 0 {
+		b.state = connectivity.TransientFailure
+	}
+	if b.state != connectivity.TransientFailure {
+		// The picker will not change since the balancer does not currently
+		// report an error.
+		return
+	}
+	b.regeneratePicker()
+	if b.picker != nil {
+		b.cc.UpdateBalancerState(b.state, b.picker)
+	} else {
+		b.cc.UpdateState(balancer.State{
+			ConnectivityState: b.state,
+			Picker:            b.v2Picker,
+		})
 	}
 }
 
@@ -99,6 +113,12 @@ func (b *baseBalancer) UpdateClientConnState(s balancer.ClientConnState) error {
 	if grpclog.V(2) {
 		grpclog.Infoln("base.baseBalancer: got new ClientConn state: ", s)
 	}
+	if len(s.ResolverState.Addresses) == 0 {
+		b.ResolverError(errors.New("produced zero addresses"))
+		return balancer.ErrBadResolverState
+	}
+	// Successful resolution; clear resolver error and ensure we return nil.
+	b.resolverErr = nil
 	// addrsSet is the set converted from addrs, it's used for quick lookup of an address.
 	addrsSet := make(map[resolver.Address]struct{})
 	for _, a := range s.ResolverState.Addresses {
@@ -127,24 +147,30 @@ func (b *baseBalancer) UpdateClientConnState(s balancer.ClientConnState) error {
 	return nil
 }
 
+// mergeErrors builds an error from the last connection error and the last
+// resolver error.  Must only be called if b.state is TransientFailure.
+func (b *baseBalancer) mergeErrors() error {
+	// connErr must always be non-nil unless there are no SubConns, in which
+	// case resolverErr must be non-nil.
+	if b.connErr == nil {
+		return fmt.Errorf("last resolver error: %v", b.resolverErr)
+	}
+	if b.resolverErr == nil {
+		return fmt.Errorf("last connection error: %v", b.connErr)
+	}
+	return fmt.Errorf("last connection error: %v; last resolver error: %v", b.connErr, b.resolverErr)
+}
+
 // regeneratePicker takes a snapshot of the balancer, and generates a picker
 // from it. The picker is
-//  - errPicker with ErrTransientFailure if the balancer is in TransientFailure,
+//  - errPicker if the balancer is in TransientFailure,
 //  - built by the pickerBuilder with all READY SubConns otherwise.
-func (b *baseBalancer) regeneratePicker(err error) {
+func (b *baseBalancer) regeneratePicker() {
 	if b.state == connectivity.TransientFailure {
 		if b.pickerBuilder != nil {
 			b.picker = NewErrPicker(balancer.ErrTransientFailure)
 		} else {
-			if err != nil {
-				b.v2Picker = NewErrPickerV2(balancer.TransientFailureError(err))
-			} else {
-				// This means the last subchannel transition was not to
-				// TransientFailure (otherwise err must be set), but the
-				// aggregate state of the balancer is TransientFailure, meaning
-				// there are no other addresses.
-				b.v2Picker = NewErrPickerV2(balancer.TransientFailureError(errors.New("resolver returned no addresses")))
-			}
+			b.v2Picker = NewErrPickerV2(balancer.TransientFailureError(b.mergeErrors()))
 		}
 		return
 	}
@@ -187,6 +213,12 @@ func (b *baseBalancer) UpdateSubConnState(sc balancer.SubConn, state balancer.Su
 		}
 		return
 	}
+	if oldS == connectivity.TransientFailure && s == connectivity.Connecting {
+		// Once a subconn enters TRANSIENT_FAILURE, ignore subsequent
+		// CONNECTING transitions to prevent the aggregated state from being
+		// always CONNECTING when many backends exist but are all down.
+		return
+	}
 	b.scStates[sc] = s
 	switch s {
 	case connectivity.Idle:
@@ -195,19 +227,20 @@ func (b *baseBalancer) UpdateSubConnState(sc balancer.SubConn, state balancer.Su
 		// When an address was removed by resolver, b called RemoveSubConn but
 		// kept the sc's state in scStates. Remove state for this sc here.
 		delete(b.scStates, sc)
+	case connectivity.TransientFailure:
+		// Save error to be reported via picker.
+		b.connErr = state.ConnectionError
 	}
 
-	oldAggrState := b.state
 	b.state = b.csEvltr.RecordTransition(oldS, s)
 
 	// Regenerate picker when one of the following happens:
-	//  - this sc became ready from not-ready
-	//  - this sc became not-ready from ready
-	//  - the aggregated state of balancer became TransientFailure from non-TransientFailure
-	//  - the aggregated state of balancer became non-TransientFailure from TransientFailure
+	//  - this sc entered or left ready
+	//  - the aggregated state of balancer is TransientFailure
+	//    (may need to update error message)
 	if (s == connectivity.Ready) != (oldS == connectivity.Ready) ||
-		(b.state == connectivity.TransientFailure) != (oldAggrState == connectivity.TransientFailure) {
-		b.regeneratePicker(state.ConnectionError)
+		b.state == connectivity.TransientFailure {
+		b.regeneratePicker()
 	}
 
 	if b.picker != nil {