[chore] remove vendor

1 files changed, 0 insertions, 911 deletions

diff --git a/vendor/google.golang.org/grpc/balancer/pickfirst/pickfirstleaf/pickfirstleaf.go b/vendor/google.golang.org/grpc/balancer/pickfirst/pickfirstleaf/pickfirstleaf.go
deleted file mode 100644
index 2fc0a71f9..000000000
--- a/vendor/google.golang.org/grpc/balancer/pickfirst/pickfirstleaf/pickfirstleaf.go
+++ /dev/null
@@ -1,911 +0,0 @@
-/*
- *
- * Copyright 2024 gRPC authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-
-// Package pickfirstleaf contains the pick_first load balancing policy which
-// will be the universal leaf policy after dualstack changes are implemented.
-//
-// # Experimental
-//
-// Notice: This package is EXPERIMENTAL and may be changed or removed in a
-// later release.
-package pickfirstleaf
-
-import (
-	"encoding/json"
-	"errors"
-	"fmt"
-	"net"
-	"net/netip"
-	"sync"
-	"time"
-
-	"google.golang.org/grpc/balancer"
-	"google.golang.org/grpc/balancer/pickfirst/internal"
-	"google.golang.org/grpc/connectivity"
-	expstats "google.golang.org/grpc/experimental/stats"
-	"google.golang.org/grpc/grpclog"
-	"google.golang.org/grpc/internal/envconfig"
-	internalgrpclog "google.golang.org/grpc/internal/grpclog"
-	"google.golang.org/grpc/internal/pretty"
-	"google.golang.org/grpc/resolver"
-	"google.golang.org/grpc/serviceconfig"
-)
-
-func init() {
-	if envconfig.NewPickFirstEnabled {
-		// Register as the default pick_first balancer.
-		Name = "pick_first"
-	}
-	balancer.Register(pickfirstBuilder{})
-}
-
-// enableHealthListenerKeyType is a unique key type used in resolver attributes
-// to indicate whether the health listener usage is enabled.
-type enableHealthListenerKeyType struct{}
-
-var (
-	logger = grpclog.Component("pick-first-leaf-lb")
-	// Name is the name of the pick_first_leaf balancer.
-	// It is changed to "pick_first" in init() if this balancer is to be
-	// registered as the default pickfirst.
-	Name                 = "pick_first_leaf"
-	disconnectionsMetric = expstats.RegisterInt64Count(expstats.MetricDescriptor{
-		Name:        "grpc.lb.pick_first.disconnections",
-		Description: "EXPERIMENTAL. Number of times the selected subchannel becomes disconnected.",
-		Unit:        "disconnection",
-		Labels:      []string{"grpc.target"},
-		Default:     false,
-	})
-	connectionAttemptsSucceededMetric = expstats.RegisterInt64Count(expstats.MetricDescriptor{
-		Name:        "grpc.lb.pick_first.connection_attempts_succeeded",
-		Description: "EXPERIMENTAL. Number of successful connection attempts.",
-		Unit:        "attempt",
-		Labels:      []string{"grpc.target"},
-		Default:     false,
-	})
-	connectionAttemptsFailedMetric = expstats.RegisterInt64Count(expstats.MetricDescriptor{
-		Name:        "grpc.lb.pick_first.connection_attempts_failed",
-		Description: "EXPERIMENTAL. Number of failed connection attempts.",
-		Unit:        "attempt",
-		Labels:      []string{"grpc.target"},
-		Default:     false,
-	})
-)
-
-const (
-	// TODO: change to pick-first when this becomes the default pick_first policy.
-	logPrefix = "[pick-first-leaf-lb %p] "
-	// connectionDelayInterval is the time to wait for during the happy eyeballs
-	// pass before starting the next connection attempt.
-	connectionDelayInterval = 250 * time.Millisecond
-)
-
-type ipAddrFamily int
-
-const (
-	// ipAddrFamilyUnknown represents strings that can't be parsed as an IP
-	// address.
-	ipAddrFamilyUnknown ipAddrFamily = iota
-	ipAddrFamilyV4
-	ipAddrFamilyV6
-)
-
-type pickfirstBuilder struct{}
-
-func (pickfirstBuilder) Build(cc balancer.ClientConn, bo balancer.BuildOptions) balancer.Balancer {
-	b := &pickfirstBalancer{
-		cc:              cc,
-		target:          bo.Target.String(),
-		metricsRecorder: bo.MetricsRecorder, // ClientConn will always create a Metrics Recorder.
-
-		subConns:              resolver.NewAddressMap(),
-		state:                 connectivity.Connecting,
-		cancelConnectionTimer: func() {},
-	}
-	b.logger = internalgrpclog.NewPrefixLogger(logger, fmt.Sprintf(logPrefix, b))
-	return b
-}
-
-func (b pickfirstBuilder) Name() string {
-	return Name
-}
-
-func (pickfirstBuilder) ParseConfig(js json.RawMessage) (serviceconfig.LoadBalancingConfig, error) {
-	var cfg pfConfig
-	if err := json.Unmarshal(js, &cfg); err != nil {
-		return nil, fmt.Errorf("pickfirst: unable to unmarshal LB policy config: %s, error: %v", string(js), err)
-	}
-	return cfg, nil
-}
-
-// EnableHealthListener updates the state to configure pickfirst for using a
-// generic health listener.
-func EnableHealthListener(state resolver.State) resolver.State {
-	state.Attributes = state.Attributes.WithValue(enableHealthListenerKeyType{}, true)
-	return state
-}
-
-type pfConfig struct {
-	serviceconfig.LoadBalancingConfig `json:"-"`
-
-	// If set to true, instructs the LB policy to shuffle the order of the list
-	// of endpoints received from the name resolver before attempting to
-	// connect to them.
-	ShuffleAddressList bool `json:"shuffleAddressList"`
-}
-
-// scData keeps track of the current state of the subConn.
-// It is not safe for concurrent access.
-type scData struct {
-	// The following fields are initialized at build time and read-only after
-	// that.
-	subConn balancer.SubConn
-	addr    resolver.Address
-
-	rawConnectivityState connectivity.State
-	// The effective connectivity state based on raw connectivity, health state
-	// and after following sticky TransientFailure behaviour defined in A62.
-	effectiveState              connectivity.State
-	lastErr                     error
-	connectionFailedInFirstPass bool
-}
-
-func (b *pickfirstBalancer) newSCData(addr resolver.Address) (*scData, error) {
-	sd := &scData{
-		rawConnectivityState: connectivity.Idle,
-		effectiveState:       connectivity.Idle,
-		addr:                 addr,
-	}
-	sc, err := b.cc.NewSubConn([]resolver.Address{addr}, balancer.NewSubConnOptions{
-		StateListener: func(state balancer.SubConnState) {
-			b.updateSubConnState(sd, state)
-		},
-	})
-	if err != nil {
-		return nil, err
-	}
-	sd.subConn = sc
-	return sd, nil
-}
-
-type pickfirstBalancer struct {
-	// The following fields are initialized at build time and read-only after
-	// that and therefore do not need to be guarded by a mutex.
-	logger          *internalgrpclog.PrefixLogger
-	cc              balancer.ClientConn
-	target          string
-	metricsRecorder expstats.MetricsRecorder // guaranteed to be non nil
-
-	// The mutex is used to ensure synchronization of updates triggered
-	// from the idle picker and the already serialized resolver,
-	// SubConn state updates.
-	mu sync.Mutex
-	// State reported to the channel based on SubConn states and resolver
-	// updates.
-	state connectivity.State
-	// scData for active subonns mapped by address.
-	subConns              *resolver.AddressMap
-	addressList           addressList
-	firstPass             bool
-	numTF                 int
-	cancelConnectionTimer func()
-	healthCheckingEnabled bool
-}
-
-// ResolverError is called by the ClientConn when the name resolver produces
-// an error or when pickfirst determined the resolver update to be invalid.
-func (b *pickfirstBalancer) ResolverError(err error) {
-	b.mu.Lock()
-	defer b.mu.Unlock()
-	b.resolverErrorLocked(err)
-}
-
-func (b *pickfirstBalancer) resolverErrorLocked(err error) {
-	if b.logger.V(2) {
-		b.logger.Infof("Received error from the name resolver: %v", err)
-	}
-
-	// The picker will not change since the balancer does not currently
-	// report an error. If the balancer hasn't received a single good resolver
-	// update yet, transition to TRANSIENT_FAILURE.
-	if b.state != connectivity.TransientFailure && b.addressList.size() > 0 {
-		if b.logger.V(2) {
-			b.logger.Infof("Ignoring resolver error because balancer is using a previous good update.")
-		}
-		return
-	}
-
-	b.updateBalancerState(balancer.State{
-		ConnectivityState: connectivity.TransientFailure,
-		Picker:            &picker{err: fmt.Errorf("name resolver error: %v", err)},
-	})
-}
-
-func (b *pickfirstBalancer) UpdateClientConnState(state balancer.ClientConnState) error {
-	b.mu.Lock()
-	defer b.mu.Unlock()
-	b.cancelConnectionTimer()
-	if len(state.ResolverState.Addresses) == 0 && len(state.ResolverState.Endpoints) == 0 {
-		// Cleanup state pertaining to the previous resolver state.
-		// Treat an empty address list like an error by calling b.ResolverError.
-		b.closeSubConnsLocked()
-		b.addressList.updateAddrs(nil)
-		b.resolverErrorLocked(errors.New("produced zero addresses"))
-		return balancer.ErrBadResolverState
-	}
-	b.healthCheckingEnabled = state.ResolverState.Attributes.Value(enableHealthListenerKeyType{}) != nil
-	cfg, ok := state.BalancerConfig.(pfConfig)
-	if state.BalancerConfig != nil && !ok {
-		return fmt.Errorf("pickfirst: received illegal BalancerConfig (type %T): %v: %w", state.BalancerConfig, state.BalancerConfig, balancer.ErrBadResolverState)
-	}
-
-	if b.logger.V(2) {
-		b.logger.Infof("Received new config %s, resolver state %s", pretty.ToJSON(cfg), pretty.ToJSON(state.ResolverState))
-	}
-
-	var newAddrs []resolver.Address
-	if endpoints := state.ResolverState.Endpoints; len(endpoints) != 0 {
-		// Perform the optional shuffling described in gRFC A62. The shuffling
-		// will change the order of endpoints but not touch the order of the
-		// addresses within each endpoint. - A61
-		if cfg.ShuffleAddressList {
-			endpoints = append([]resolver.Endpoint{}, endpoints...)
-			internal.RandShuffle(len(endpoints), func(i, j int) { endpoints[i], endpoints[j] = endpoints[j], endpoints[i] })
-		}
-
-		// "Flatten the list by concatenating the ordered list of addresses for
-		// each of the endpoints, in order." - A61
-		for _, endpoint := range endpoints {
-			newAddrs = append(newAddrs, endpoint.Addresses...)
-		}
-	} else {
-		// Endpoints not set, process addresses until we migrate resolver
-		// emissions fully to Endpoints. The top channel does wrap emitted
-		// addresses with endpoints, however some balancers such as weighted
-		// target do not forward the corresponding correct endpoints down/split
-		// endpoints properly. Once all balancers correctly forward endpoints
-		// down, can delete this else conditional.
-		newAddrs = state.ResolverState.Addresses
-		if cfg.ShuffleAddressList {
-			newAddrs = append([]resolver.Address{}, newAddrs...)
-			internal.RandShuffle(len(endpoints), func(i, j int) { endpoints[i], endpoints[j] = endpoints[j], endpoints[i] })
-		}
-	}
-
-	// If an address appears in multiple endpoints or in the same endpoint
-	// multiple times, we keep it only once. We will create only one SubConn
-	// for the address because an AddressMap is used to store SubConns.
-	// Not de-duplicating would result in attempting to connect to the same
-	// SubConn multiple times in the same pass. We don't want this.
-	newAddrs = deDupAddresses(newAddrs)
-	newAddrs = interleaveAddresses(newAddrs)
-
-	prevAddr := b.addressList.currentAddress()
-	prevSCData, found := b.subConns.Get(prevAddr)
-	prevAddrsCount := b.addressList.size()
-	isPrevRawConnectivityStateReady := found && prevSCData.(*scData).rawConnectivityState == connectivity.Ready
-	b.addressList.updateAddrs(newAddrs)
-
-	// If the previous ready SubConn exists in new address list,
-	// keep this connection and don't create new SubConns.
-	if isPrevRawConnectivityStateReady && b.addressList.seekTo(prevAddr) {
-		return nil
-	}
-
-	b.reconcileSubConnsLocked(newAddrs)
-	// If it's the first resolver update or the balancer was already READY
-	// (but the new address list does not contain the ready SubConn) or
-	// CONNECTING, enter CONNECTING.
-	// We may be in TRANSIENT_FAILURE due to a previous empty address list,
-	// we should still enter CONNECTING because the sticky TF behaviour
-	//  mentioned in A62 applies only when the TRANSIENT_FAILURE is reported
-	// due to connectivity failures.
-	if isPrevRawConnectivityStateReady || b.state == connectivity.Connecting || prevAddrsCount == 0 {
-		// Start connection attempt at first address.
-		b.forceUpdateConcludedStateLocked(balancer.State{
-			ConnectivityState: connectivity.Connecting,
-			Picker:            &picker{err: balancer.ErrNoSubConnAvailable},
-		})
-		b.startFirstPassLocked()
-	} else if b.state == connectivity.TransientFailure {
-		// If we're in TRANSIENT_FAILURE, we stay in TRANSIENT_FAILURE until
-		// we're READY. See A62.
-		b.startFirstPassLocked()
-	}
-	return nil
-}
-
-// UpdateSubConnState is unused as a StateListener is always registered when
-// creating SubConns.
-func (b *pickfirstBalancer) UpdateSubConnState(subConn balancer.SubConn, state balancer.SubConnState) {
-	b.logger.Errorf("UpdateSubConnState(%v, %+v) called unexpectedly", subConn, state)
-}
-
-func (b *pickfirstBalancer) Close() {
-	b.mu.Lock()
-	defer b.mu.Unlock()
-	b.closeSubConnsLocked()
-	b.cancelConnectionTimer()
-	b.state = connectivity.Shutdown
-}
-
-// ExitIdle moves the balancer out of idle state. It can be called concurrently
-// by the idlePicker and clientConn so access to variables should be
-// synchronized.
-func (b *pickfirstBalancer) ExitIdle() {
-	b.mu.Lock()
-	defer b.mu.Unlock()
-	if b.state == connectivity.Idle {
-		b.startFirstPassLocked()
-	}
-}
-
-func (b *pickfirstBalancer) startFirstPassLocked() {
-	b.firstPass = true
-	b.numTF = 0
-	// Reset the connection attempt record for existing SubConns.
-	for _, sd := range b.subConns.Values() {
-		sd.(*scData).connectionFailedInFirstPass = false
-	}
-	b.requestConnectionLocked()
-}
-
-func (b *pickfirstBalancer) closeSubConnsLocked() {
-	for _, sd := range b.subConns.Values() {
-		sd.(*scData).subConn.Shutdown()
-	}
-	b.subConns = resolver.NewAddressMap()
-}
-
-// deDupAddresses ensures that each address appears only once in the slice.
-func deDupAddresses(addrs []resolver.Address) []resolver.Address {
-	seenAddrs := resolver.NewAddressMap()
-	retAddrs := []resolver.Address{}
-
-	for _, addr := range addrs {
-		if _, ok := seenAddrs.Get(addr); ok {
-			continue
-		}
-		retAddrs = append(retAddrs, addr)
-	}
-	return retAddrs
-}
-
-// interleaveAddresses interleaves addresses of both families (IPv4 and IPv6)
-// as per RFC-8305 section 4.
-// Whichever address family is first in the list is followed by an address of
-// the other address family; that is, if the first address in the list is IPv6,
-// then the first IPv4 address should be moved up in the list to be second in
-// the list. It doesn't support configuring "First Address Family Count", i.e.
-// there will always be a single member of the first address family at the
-// beginning of the interleaved list.
-// Addresses that are neither IPv4 nor IPv6 are treated as part of a third
-// "unknown" family for interleaving.
-// See: https://datatracker.ietf.org/doc/html/rfc8305#autoid-6
-func interleaveAddresses(addrs []resolver.Address) []resolver.Address {
-	familyAddrsMap := map[ipAddrFamily][]resolver.Address{}
-	interleavingOrder := []ipAddrFamily{}
-	for _, addr := range addrs {
-		family := addressFamily(addr.Addr)
-		if _, found := familyAddrsMap[family]; !found {
-			interleavingOrder = append(interleavingOrder, family)
-		}
-		familyAddrsMap[family] = append(familyAddrsMap[family], addr)
-	}
-
-	interleavedAddrs := make([]resolver.Address, 0, len(addrs))
-
-	for curFamilyIdx := 0; len(interleavedAddrs) < len(addrs); curFamilyIdx = (curFamilyIdx + 1) % len(interleavingOrder) {
-		// Some IP types may have fewer addresses than others, so we look for
-		// the next type that has a remaining member to add to the interleaved
-		// list.
-		family := interleavingOrder[curFamilyIdx]
-		remainingMembers := familyAddrsMap[family]
-		if len(remainingMembers) > 0 {
-			interleavedAddrs = append(interleavedAddrs, remainingMembers[0])
-			familyAddrsMap[family] = remainingMembers[1:]
-		}
-	}
-
-	return interleavedAddrs
-}
-
-// addressFamily returns the ipAddrFamily after parsing the address string.
-// If the address isn't of the format "ip-address:port", it returns
-// ipAddrFamilyUnknown. The address may be valid even if it's not an IP when
-// using a resolver like passthrough where the address may be a hostname in
-// some format that the dialer can resolve.
-func addressFamily(address string) ipAddrFamily {
-	// Parse the IP after removing the port.
-	host, _, err := net.SplitHostPort(address)
-	if err != nil {
-		return ipAddrFamilyUnknown
-	}
-	ip, err := netip.ParseAddr(host)
-	if err != nil {
-		return ipAddrFamilyUnknown
-	}
-	switch {
-	case ip.Is4() || ip.Is4In6():
-		return ipAddrFamilyV4
-	case ip.Is6():
-		return ipAddrFamilyV6
-	default:
-		return ipAddrFamilyUnknown
-	}
-}
-
-// reconcileSubConnsLocked updates the active subchannels based on a new address
-// list from the resolver. It does this by:
-//   - closing subchannels: any existing subchannels associated with addresses
-//     that are no longer in the updated list are shut down.
-//   - removing subchannels: entries for these closed subchannels are removed
-//     from the subchannel map.
-//
-// This ensures that the subchannel map accurately reflects the current set of
-// addresses received from the name resolver.
-func (b *pickfirstBalancer) reconcileSubConnsLocked(newAddrs []resolver.Address) {
-	newAddrsMap := resolver.NewAddressMap()
-	for _, addr := range newAddrs {
-		newAddrsMap.Set(addr, true)
-	}
-
-	for _, oldAddr := range b.subConns.Keys() {
-		if _, ok := newAddrsMap.Get(oldAddr); ok {
-			continue
-		}
-		val, _ := b.subConns.Get(oldAddr)
-		val.(*scData).subConn.Shutdown()
-		b.subConns.Delete(oldAddr)
-	}
-}
-
-// shutdownRemainingLocked shuts down remaining subConns. Called when a subConn
-// becomes ready, which means that all other subConn must be shutdown.
-func (b *pickfirstBalancer) shutdownRemainingLocked(selected *scData) {
-	b.cancelConnectionTimer()
-	for _, v := range b.subConns.Values() {
-		sd := v.(*scData)
-		if sd.subConn != selected.subConn {
-			sd.subConn.Shutdown()
-		}
-	}
-	b.subConns = resolver.NewAddressMap()
-	b.subConns.Set(selected.addr, selected)
-}
-
-// requestConnectionLocked starts connecting on the subchannel corresponding to
-// the current address. If no subchannel exists, one is created. If the current
-// subchannel is in TransientFailure, a connection to the next address is
-// attempted until a subchannel is found.
-func (b *pickfirstBalancer) requestConnectionLocked() {
-	if !b.addressList.isValid() {
-		return
-	}
-	var lastErr error
-	for valid := true; valid; valid = b.addressList.increment() {
-		curAddr := b.addressList.currentAddress()
-		sd, ok := b.subConns.Get(curAddr)
-		if !ok {
-			var err error
-			// We want to assign the new scData to sd from the outer scope,
-			// hence we can't use := below.
-			sd, err = b.newSCData(curAddr)
-			if err != nil {
-				// This should never happen, unless the clientConn is being shut
-				// down.
-				if b.logger.V(2) {
-					b.logger.Infof("Failed to create a subConn for address %v: %v", curAddr.String(), err)
-				}
-				// Do nothing, the LB policy will be closed soon.
-				return
-			}
-			b.subConns.Set(curAddr, sd)
-		}
-
-		scd := sd.(*scData)
-		switch scd.rawConnectivityState {
-		case connectivity.Idle:
-			scd.subConn.Connect()
-			b.scheduleNextConnectionLocked()
-			return
-		case connectivity.TransientFailure:
-			// The SubConn is being re-used and failed during a previous pass
-			// over the addressList. It has not completed backoff yet.
-			// Mark it as having failed and try the next address.
-			scd.connectionFailedInFirstPass = true
-			lastErr = scd.lastErr
-			continue
-		case connectivity.Connecting:
-			// Wait for the connection attempt to complete or the timer to fire
-			// before attempting the next address.
-			b.scheduleNextConnectionLocked()
-			return
-		default:
-			b.logger.Errorf("SubConn with unexpected state %v present in SubConns map.", scd.rawConnectivityState)
-			return
-
-		}
-	}
-
-	// All the remaining addresses in the list are in TRANSIENT_FAILURE, end the
-	// first pass if possible.
-	b.endFirstPassIfPossibleLocked(lastErr)
-}
-
-func (b *pickfirstBalancer) scheduleNextConnectionLocked() {
-	b.cancelConnectionTimer()
-	if !b.addressList.hasNext() {
-		return
-	}
-	curAddr := b.addressList.currentAddress()
-	cancelled := false // Access to this is protected by the balancer's mutex.
-	closeFn := internal.TimeAfterFunc(connectionDelayInterval, func() {
-		b.mu.Lock()
-		defer b.mu.Unlock()
-		// If the scheduled task is cancelled while acquiring the mutex, return.
-		if cancelled {
-			return
-		}
-		if b.logger.V(2) {
-			b.logger.Infof("Happy Eyeballs timer expired while waiting for connection to %q.", curAddr.Addr)
-		}
-		if b.addressList.increment() {
-			b.requestConnectionLocked()
-		}
-	})
-	// Access to the cancellation callback held by the balancer is guarded by
-	// the balancer's mutex, so it's safe to set the boolean from the callback.
-	b.cancelConnectionTimer = sync.OnceFunc(func() {
-		cancelled = true
-		closeFn()
-	})
-}
-
-func (b *pickfirstBalancer) updateSubConnState(sd *scData, newState balancer.SubConnState) {
-	b.mu.Lock()
-	defer b.mu.Unlock()
-	oldState := sd.rawConnectivityState
-	sd.rawConnectivityState = newState.ConnectivityState
-	// Previously relevant SubConns can still callback with state updates.
-	// To prevent pickers from returning these obsolete SubConns, this logic
-	// is included to check if the current list of active SubConns includes this
-	// SubConn.
-	if !b.isActiveSCData(sd) {
-		return
-	}
-	if newState.ConnectivityState == connectivity.Shutdown {
-		sd.effectiveState = connectivity.Shutdown
-		return
-	}
-
-	// Record a connection attempt when exiting CONNECTING.
-	if newState.ConnectivityState == connectivity.TransientFailure {
-		sd.connectionFailedInFirstPass = true
-		connectionAttemptsFailedMetric.Record(b.metricsRecorder, 1, b.target)
-	}
-
-	if newState.ConnectivityState == connectivity.Ready {
-		connectionAttemptsSucceededMetric.Record(b.metricsRecorder, 1, b.target)
-		b.shutdownRemainingLocked(sd)
-		if !b.addressList.seekTo(sd.addr) {
-			// This should not fail as we should have only one SubConn after
-			// entering READY. The SubConn should be present in the addressList.
-			b.logger.Errorf("Address %q not found address list in  %v", sd.addr, b.addressList.addresses)
-			return
-		}
-		if !b.healthCheckingEnabled {
-			if b.logger.V(2) {
-				b.logger.Infof("SubConn %p reported connectivity state READY and the health listener is disabled. Transitioning SubConn to READY.", sd.subConn)
-			}
-
-			sd.effectiveState = connectivity.Ready
-			b.updateBalancerState(balancer.State{
-				ConnectivityState: connectivity.Ready,
-				Picker:            &picker{result: balancer.PickResult{SubConn: sd.subConn}},
-			})
-			return
-		}
-		if b.logger.V(2) {
-			b.logger.Infof("SubConn %p reported connectivity state READY. Registering health listener.", sd.subConn)
-		}
-		// Send a CONNECTING update to take the SubConn out of sticky-TF if
-		// required.
-		sd.effectiveState = connectivity.Connecting
-		b.updateBalancerState(balancer.State{
-			ConnectivityState: connectivity.Connecting,
-			Picker:            &picker{err: balancer.ErrNoSubConnAvailable},
-		})
-		sd.subConn.RegisterHealthListener(func(scs balancer.SubConnState) {
-			b.updateSubConnHealthState(sd, scs)
-		})
-		return
-	}
-
-	// If the LB policy is READY, and it receives a subchannel state change,
-	// it means that the READY subchannel has failed.
-	// A SubConn can also transition from CONNECTING directly to IDLE when
-	// a transport is successfully created, but the connection fails
-	// before the SubConn can send the notification for READY. We treat
-	// this as a successful connection and transition to IDLE.
-	// TODO: https://github.com/grpc/grpc-go/issues/7862 - Remove the second
-	// part of the if condition below once the issue is fixed.
-	if oldState == connectivity.Ready || (oldState == connectivity.Connecting && newState.ConnectivityState == connectivity.Idle) {
-		// Once a transport fails, the balancer enters IDLE and starts from
-		// the first address when the picker is used.
-		b.shutdownRemainingLocked(sd)
-		sd.effectiveState = newState.ConnectivityState
-		// READY SubConn interspliced in between CONNECTING and IDLE, need to
-		// account for that.
-		if oldState == connectivity.Connecting {
-			// A known issue (https://github.com/grpc/grpc-go/issues/7862)
-			// causes a race that prevents the READY state change notification.
-			// This works around it.
-			connectionAttemptsSucceededMetric.Record(b.metricsRecorder, 1, b.target)
-		}
-		disconnectionsMetric.Record(b.metricsRecorder, 1, b.target)
-		b.addressList.reset()
-		b.updateBalancerState(balancer.State{
-			ConnectivityState: connectivity.Idle,
-			Picker:            &idlePicker{exitIdle: sync.OnceFunc(b.ExitIdle)},
-		})
-		return
-	}
-
-	if b.firstPass {
-		switch newState.ConnectivityState {
-		case connectivity.Connecting:
-			// The effective state can be in either IDLE, CONNECTING or
-			// TRANSIENT_FAILURE. If it's  TRANSIENT_FAILURE, stay in
-			// TRANSIENT_FAILURE until it's READY. See A62.
-			if sd.effectiveState != connectivity.TransientFailure {
-				sd.effectiveState = connectivity.Connecting
-				b.updateBalancerState(balancer.State{
-					ConnectivityState: connectivity.Connecting,
-					Picker:            &picker{err: balancer.ErrNoSubConnAvailable},
-				})
-			}
-		case connectivity.TransientFailure:
-			sd.lastErr = newState.ConnectionError
-			sd.effectiveState = connectivity.TransientFailure
-			// Since we're re-using common SubConns while handling resolver
-			// updates, we could receive an out of turn TRANSIENT_FAILURE from
-			// a pass over the previous address list. Happy Eyeballs will also
-			// cause out of order updates to arrive.
-
-			if curAddr := b.addressList.currentAddress(); equalAddressIgnoringBalAttributes(&curAddr, &sd.addr) {
-				b.cancelConnectionTimer()
-				if b.addressList.increment() {
-					b.requestConnectionLocked()
-					return
-				}
-			}
-
-			// End the first pass if we've seen a TRANSIENT_FAILURE from all
-			// SubConns once.
-			b.endFirstPassIfPossibleLocked(newState.ConnectionError)
-		}
-		return
-	}
-
-	// We have finished the first pass, keep re-connecting failing SubConns.
-	switch newState.ConnectivityState {
-	case connectivity.TransientFailure:
-		b.numTF = (b.numTF + 1) % b.subConns.Len()
-		sd.lastErr = newState.ConnectionError
-		if b.numTF%b.subConns.Len() == 0 {
-			b.updateBalancerState(balancer.State{
-				ConnectivityState: connectivity.TransientFailure,
-				Picker:            &picker{err: newState.ConnectionError},
-			})
-		}
-		// We don't need to request re-resolution since the SubConn already
-		// does that before reporting TRANSIENT_FAILURE.
-		// TODO: #7534 - Move re-resolution requests from SubConn into
-		// pick_first.
-	case connectivity.Idle:
-		sd.subConn.Connect()
-	}
-}
-
-// endFirstPassIfPossibleLocked ends the first happy-eyeballs pass if all the
-// addresses are tried and their SubConns have reported a failure.
-func (b *pickfirstBalancer) endFirstPassIfPossibleLocked(lastErr error) {
-	// An optimization to avoid iterating over the entire SubConn map.
-	if b.addressList.isValid() {
-		return
-	}
-	// Connect() has been called on all the SubConns. The first pass can be
-	// ended if all the SubConns have reported a failure.
-	for _, v := range b.subConns.Values() {
-		sd := v.(*scData)
-		if !sd.connectionFailedInFirstPass {
-			return
-		}
-	}
-	b.firstPass = false
-	b.updateBalancerState(balancer.State{
-		ConnectivityState: connectivity.TransientFailure,
-		Picker:            &picker{err: lastErr},
-	})
-	// Start re-connecting all the SubConns that are already in IDLE.
-	for _, v := range b.subConns.Values() {
-		sd := v.(*scData)
-		if sd.rawConnectivityState == connectivity.Idle {
-			sd.subConn.Connect()
-		}
-	}
-}
-
-func (b *pickfirstBalancer) isActiveSCData(sd *scData) bool {
-	activeSD, found := b.subConns.Get(sd.addr)
-	return found && activeSD == sd
-}
-
-func (b *pickfirstBalancer) updateSubConnHealthState(sd *scData, state balancer.SubConnState) {
-	b.mu.Lock()
-	defer b.mu.Unlock()
-	// Previously relevant SubConns can still callback with state updates.
-	// To prevent pickers from returning these obsolete SubConns, this logic
-	// is included to check if the current list of active SubConns includes
-	// this SubConn.
-	if !b.isActiveSCData(sd) {
-		return
-	}
-	sd.effectiveState = state.ConnectivityState
-	switch state.ConnectivityState {
-	case connectivity.Ready:
-		b.updateBalancerState(balancer.State{
-			ConnectivityState: connectivity.Ready,
-			Picker:            &picker{result: balancer.PickResult{SubConn: sd.subConn}},
-		})
-	case connectivity.TransientFailure:
-		b.updateBalancerState(balancer.State{
-			ConnectivityState: connectivity.TransientFailure,
-			Picker:            &picker{err: fmt.Errorf("pickfirst: health check failure: %v", state.ConnectionError)},
-		})
-	case connectivity.Connecting:
-		b.updateBalancerState(balancer.State{
-			ConnectivityState: connectivity.Connecting,
-			Picker:            &picker{err: balancer.ErrNoSubConnAvailable},
-		})
-	default:
-		b.logger.Errorf("Got unexpected health update for SubConn %p: %v", state)
-	}
-}
-
-// updateBalancerState stores the state reported to the channel and calls
-// ClientConn.UpdateState(). As an optimization, it avoids sending duplicate
-// updates to the channel.
-func (b *pickfirstBalancer) updateBalancerState(newState balancer.State) {
-	// In case of TransientFailures allow the picker to be updated to update
-	// the connectivity error, in all other cases don't send duplicate state
-	// updates.
-	if newState.ConnectivityState == b.state && b.state != connectivity.TransientFailure {
-		return
-	}
-	b.forceUpdateConcludedStateLocked(newState)
-}
-
-// forceUpdateConcludedStateLocked stores the state reported to the channel and
-// calls ClientConn.UpdateState().
-// A separate function is defined to force update the ClientConn state since the
-// channel doesn't correctly assume that LB policies start in CONNECTING and
-// relies on LB policy to send an initial CONNECTING update.
-func (b *pickfirstBalancer) forceUpdateConcludedStateLocked(newState balancer.State) {
-	b.state = newState.ConnectivityState
-	b.cc.UpdateState(newState)
-}
-
-type picker struct {
-	result balancer.PickResult
-	err    error
-}
-
-func (p *picker) Pick(balancer.PickInfo) (balancer.PickResult, error) {
-	return p.result, p.err
-}
-
-// idlePicker is used when the SubConn is IDLE and kicks the SubConn into
-// CONNECTING when Pick is called.
-type idlePicker struct {
-	exitIdle func()
-}
-
-func (i *idlePicker) Pick(balancer.PickInfo) (balancer.PickResult, error) {
-	i.exitIdle()
-	return balancer.PickResult{}, balancer.ErrNoSubConnAvailable
-}
-
-// addressList manages sequentially iterating over addresses present in a list
-// of endpoints. It provides a 1 dimensional view of the addresses present in
-// the endpoints.
-// This type is not safe for concurrent access.
-type addressList struct {
-	addresses []resolver.Address
-	idx       int
-}
-
-func (al *addressList) isValid() bool {
-	return al.idx < len(al.addresses)
-}
-
-func (al *addressList) size() int {
-	return len(al.addresses)
-}
-
-// increment moves to the next index in the address list.
-// This method returns false if it went off the list, true otherwise.
-func (al *addressList) increment() bool {
-	if !al.isValid() {
-		return false
-	}
-	al.idx++
-	return al.idx < len(al.addresses)
-}
-
-// currentAddress returns the current address pointed to in the addressList.
-// If the list is in an invalid state, it returns an empty address instead.
-func (al *addressList) currentAddress() resolver.Address {
-	if !al.isValid() {
-		return resolver.Address{}
-	}
-	return al.addresses[al.idx]
-}
-
-func (al *addressList) reset() {
-	al.idx = 0
-}
-
-func (al *addressList) updateAddrs(addrs []resolver.Address) {
-	al.addresses = addrs
-	al.reset()
-}
-
-// seekTo returns false if the needle was not found and the current index was
-// left unchanged.
-func (al *addressList) seekTo(needle resolver.Address) bool {
-	for ai, addr := range al.addresses {
-		if !equalAddressIgnoringBalAttributes(&addr, &needle) {
-			continue
-		}
-		al.idx = ai
-		return true
-	}
-	return false
-}
-
-// hasNext returns whether incrementing the addressList will result in moving
-// past the end of the list. If the list has already moved past the end, it
-// returns false.
-func (al *addressList) hasNext() bool {
-	if !al.isValid() {
-		return false
-	}
-	return al.idx+1 < len(al.addresses)
-}
-
-// equalAddressIgnoringBalAttributes returns true is a and b are considered
-// equal. This is different from the Equal method on the resolver.Address type
-// which considers all fields to determine equality. Here, we only consider
-// fields that are meaningful to the SubConn.
-func equalAddressIgnoringBalAttributes(a, b *resolver.Address) bool {
-	return a.Addr == b.Addr && a.ServerName == b.ServerName &&
-		a.Attributes.Equal(b.Attributes) &&
-		a.Metadata == b.Metadata
-}