420 lines
12 KiB
Go
420 lines
12 KiB
Go
package pool
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import (
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"context"
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"crypto/ecdsa"
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"errors"
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"fmt"
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"math/rand"
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"sync"
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"time"
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"github.com/nspcc-dev/neofs-api-go/pkg/acl/eacl"
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"github.com/nspcc-dev/neofs-api-go/pkg/client"
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"github.com/nspcc-dev/neofs-api-go/pkg/container"
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cid "github.com/nspcc-dev/neofs-api-go/pkg/container/id"
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"github.com/nspcc-dev/neofs-api-go/pkg/object"
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"github.com/nspcc-dev/neofs-api-go/pkg/owner"
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"github.com/nspcc-dev/neofs-api-go/pkg/session"
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"go.uber.org/zap"
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)
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// Client is a wrapper for client.Client to generate mock.
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type Client interface {
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client.Client
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}
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// BuilderOptions contains options used to build connection pool.
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type BuilderOptions struct {
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Key *ecdsa.PrivateKey
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Logger *zap.Logger
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NodeConnectionTimeout time.Duration
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NodeRequestTimeout time.Duration
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ClientRebalanceInterval time.Duration
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SessionExpirationEpoch uint64
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weights []float64
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addresses []string
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clientBuilder func(opts ...client.Option) (client.Client, error)
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}
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// Builder is an interim structure used to collect node addresses/weights and
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// build connection pool subsequently.
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type Builder struct {
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addresses []string
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weights []float64
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}
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// ContainerPollingParams contains parameters used in polling is a container created or not.
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type ContainerPollingParams struct {
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CreationTimeout time.Duration
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PollInterval time.Duration
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}
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// DefaultPollingParams creates ContainerPollingParams with default values.
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func DefaultPollingParams() *ContainerPollingParams {
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return &ContainerPollingParams{
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CreationTimeout: 120 * time.Second,
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PollInterval: 5 * time.Second,
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}
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}
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// AddNode adds address/weight pair to node PoolBuilder list.
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func (pb *Builder) AddNode(address string, weight float64) *Builder {
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pb.addresses = append(pb.addresses, address)
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pb.weights = append(pb.weights, weight)
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return pb
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}
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// Build creates new pool based on current PoolBuilder state and options.
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func (pb *Builder) Build(ctx context.Context, options *BuilderOptions) (Pool, error) {
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if len(pb.addresses) == 0 {
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return nil, errors.New("no NeoFS peers configured")
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}
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options.weights = adjustWeights(pb.weights)
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options.addresses = pb.addresses
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if options.clientBuilder == nil {
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options.clientBuilder = client.New
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}
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return newPool(ctx, options)
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}
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// Pool is an interface providing connection artifacts on request.
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type Pool interface {
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client.Object
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client.Container
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Connection() (client.Client, *session.Token, error)
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OwnerID() *owner.ID
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WaitForContainerPresence(context.Context, *cid.ID, *ContainerPollingParams) error
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Close()
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}
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type clientPack struct {
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client client.Client
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sessionToken *session.Token
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healthy bool
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}
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var _ Pool = (*pool)(nil)
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type pool struct {
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lock sync.RWMutex
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sampler *Sampler
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owner *owner.ID
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clientPacks []*clientPack
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cancel context.CancelFunc
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closedCh chan struct{}
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}
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func newPool(ctx context.Context, options *BuilderOptions) (Pool, error) {
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clientPacks := make([]*clientPack, len(options.weights))
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var atLeastOneHealthy bool
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for i, address := range options.addresses {
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c, err := options.clientBuilder(client.WithDefaultPrivateKey(options.Key),
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client.WithURIAddress(address, nil),
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client.WithDialTimeout(options.NodeConnectionTimeout))
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if err != nil {
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return nil, err
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}
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var healthy bool
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st, err := c.CreateSession(ctx, options.SessionExpirationEpoch)
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if err != nil && options.Logger != nil {
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options.Logger.Warn("failed to create neofs session token for client",
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zap.String("address", address),
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zap.Error(err))
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} else if err == nil {
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healthy, atLeastOneHealthy = true, true
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}
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clientPacks[i] = &clientPack{client: c, sessionToken: st, healthy: healthy}
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}
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if !atLeastOneHealthy {
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return nil, fmt.Errorf("at least one node must be healthy")
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}
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source := rand.NewSource(time.Now().UnixNano())
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sampler := NewSampler(options.weights, source)
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wallet, err := owner.NEO3WalletFromPublicKey(&options.Key.PublicKey)
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if err != nil {
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return nil, err
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}
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ownerID := owner.NewIDFromNeo3Wallet(wallet)
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ctx, cancel := context.WithCancel(ctx)
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pool := &pool{sampler: sampler, owner: ownerID, clientPacks: clientPacks, cancel: cancel, closedCh: make(chan struct{})}
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go startRebalance(ctx, pool, options)
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return pool, nil
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}
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func startRebalance(ctx context.Context, p *pool, options *BuilderOptions) {
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ticker := time.NewTimer(options.ClientRebalanceInterval)
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buffer := make([]float64, len(options.weights))
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for {
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select {
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case <-ctx.Done():
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close(p.closedCh)
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return
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case <-ticker.C:
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updateNodesHealth(ctx, p, options, buffer)
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ticker.Reset(options.ClientRebalanceInterval)
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}
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}
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}
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func updateNodesHealth(ctx context.Context, p *pool, options *BuilderOptions, bufferWeights []float64) {
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if len(bufferWeights) != len(p.clientPacks) {
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bufferWeights = make([]float64, len(p.clientPacks))
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}
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healthyChanged := false
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wg := sync.WaitGroup{}
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for i, cPack := range p.clientPacks {
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wg.Add(1)
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go func(i int, client client.Client) {
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defer wg.Done()
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var (
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tkn *session.Token
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err error
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)
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ok := true
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tctx, c := context.WithTimeout(ctx, options.NodeRequestTimeout)
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defer c()
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if _, err = client.EndpointInfo(tctx); err != nil {
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ok = false
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bufferWeights[i] = 0
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}
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if ok {
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bufferWeights[i] = options.weights[i]
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p.lock.RLock()
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if !p.clientPacks[i].healthy {
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if tkn, err = client.CreateSession(ctx, options.SessionExpirationEpoch); err != nil {
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ok = false
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bufferWeights[i] = 0
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}
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}
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p.lock.RUnlock()
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}
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p.lock.Lock()
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if p.clientPacks[i].healthy != ok {
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p.clientPacks[i].healthy = ok
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p.clientPacks[i].sessionToken = tkn
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healthyChanged = true
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}
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p.lock.Unlock()
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}(i, cPack.client)
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}
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wg.Wait()
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if healthyChanged {
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probabilities := adjustWeights(bufferWeights)
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source := rand.NewSource(time.Now().UnixNano())
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p.lock.Lock()
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p.sampler = NewSampler(probabilities, source)
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p.lock.Unlock()
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}
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}
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func adjustWeights(weights []float64) []float64 {
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adjusted := make([]float64, len(weights))
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sum := 0.0
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for _, weight := range weights {
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sum += weight
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}
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if sum > 0 {
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for i, weight := range weights {
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adjusted[i] = weight / sum
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}
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}
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return adjusted
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}
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func (p *pool) Connection() (client.Client, *session.Token, error) {
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p.lock.RLock()
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defer p.lock.RUnlock()
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if len(p.clientPacks) == 1 {
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cp := p.clientPacks[0]
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if cp.healthy {
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return cp.client, cp.sessionToken, nil
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}
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return nil, nil, errors.New("no healthy client")
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}
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attempts := 3 * len(p.clientPacks)
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for k := 0; k < attempts; k++ {
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i := p.sampler.Next()
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if cp := p.clientPacks[i]; cp.healthy {
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return cp.client, cp.sessionToken, nil
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}
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}
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return nil, nil, errors.New("no healthy client")
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}
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func (p *pool) OwnerID() *owner.ID {
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return p.owner
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}
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func (p *pool) conn(option []client.CallOption) (client.Client, []client.CallOption, error) {
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conn, token, err := p.Connection()
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if err != nil {
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return nil, nil, err
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}
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return conn, append([]client.CallOption{client.WithSession(token)}, option...), nil
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}
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func (p *pool) PutObject(ctx context.Context, params *client.PutObjectParams, option ...client.CallOption) (*object.ID, error) {
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conn, options, err := p.conn(option)
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if err != nil {
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return nil, err
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}
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return conn.PutObject(ctx, params, options...)
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}
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func (p *pool) DeleteObject(ctx context.Context, params *client.DeleteObjectParams, option ...client.CallOption) error {
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conn, options, err := p.conn(option)
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if err != nil {
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return err
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}
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return conn.DeleteObject(ctx, params, options...)
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}
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func (p *pool) GetObject(ctx context.Context, params *client.GetObjectParams, option ...client.CallOption) (*object.Object, error) {
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conn, options, err := p.conn(option)
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if err != nil {
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return nil, err
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}
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return conn.GetObject(ctx, params, options...)
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}
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func (p *pool) GetObjectHeader(ctx context.Context, params *client.ObjectHeaderParams, option ...client.CallOption) (*object.Object, error) {
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conn, options, err := p.conn(option)
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if err != nil {
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return nil, err
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}
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return conn.GetObjectHeader(ctx, params, options...)
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}
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func (p *pool) ObjectPayloadRangeData(ctx context.Context, params *client.RangeDataParams, option ...client.CallOption) ([]byte, error) {
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conn, options, err := p.conn(option)
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if err != nil {
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return nil, err
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}
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return conn.ObjectPayloadRangeData(ctx, params, options...)
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}
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func (p *pool) ObjectPayloadRangeSHA256(ctx context.Context, params *client.RangeChecksumParams, option ...client.CallOption) ([][32]byte, error) {
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conn, options, err := p.conn(option)
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if err != nil {
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return nil, err
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}
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return conn.ObjectPayloadRangeSHA256(ctx, params, options...)
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}
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func (p *pool) ObjectPayloadRangeTZ(ctx context.Context, params *client.RangeChecksumParams, option ...client.CallOption) ([][64]byte, error) {
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conn, options, err := p.conn(option)
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if err != nil {
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return nil, err
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}
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return conn.ObjectPayloadRangeTZ(ctx, params, options...)
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}
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func (p *pool) SearchObject(ctx context.Context, params *client.SearchObjectParams, option ...client.CallOption) ([]*object.ID, error) {
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conn, options, err := p.conn(option)
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if err != nil {
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return nil, err
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}
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return conn.SearchObject(ctx, params, options...)
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}
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func (p *pool) PutContainer(ctx context.Context, cnr *container.Container, option ...client.CallOption) (*cid.ID, error) {
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conn, options, err := p.conn(option)
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if err != nil {
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return nil, err
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}
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return conn.PutContainer(ctx, cnr, options...)
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}
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func (p *pool) GetContainer(ctx context.Context, cid *cid.ID, option ...client.CallOption) (*container.Container, error) {
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conn, options, err := p.conn(option)
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if err != nil {
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return nil, err
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}
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return conn.GetContainer(ctx, cid, options...)
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}
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func (p *pool) ListContainers(ctx context.Context, ownerID *owner.ID, option ...client.CallOption) ([]*cid.ID, error) {
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conn, options, err := p.conn(option)
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if err != nil {
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return nil, err
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}
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return conn.ListContainers(ctx, ownerID, options...)
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}
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func (p *pool) DeleteContainer(ctx context.Context, cid *cid.ID, option ...client.CallOption) error {
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conn, options, err := p.conn(option)
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if err != nil {
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return err
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}
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return conn.DeleteContainer(ctx, cid, options...)
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}
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func (p *pool) GetEACL(ctx context.Context, cid *cid.ID, option ...client.CallOption) (*client.EACLWithSignature, error) {
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conn, options, err := p.conn(option)
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if err != nil {
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return nil, err
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}
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return conn.GetEACL(ctx, cid, options...)
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}
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func (p *pool) SetEACL(ctx context.Context, table *eacl.Table, option ...client.CallOption) error {
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conn, options, err := p.conn(option)
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if err != nil {
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return err
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}
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return conn.SetEACL(ctx, table, options...)
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}
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func (p *pool) AnnounceContainerUsedSpace(ctx context.Context, announce []container.UsedSpaceAnnouncement, option ...client.CallOption) error {
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conn, options, err := p.conn(option)
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if err != nil {
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return err
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}
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return conn.AnnounceContainerUsedSpace(ctx, announce, options...)
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}
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func (p *pool) WaitForContainerPresence(ctx context.Context, cid *cid.ID, pollParams *ContainerPollingParams) error {
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conn, _, err := p.Connection()
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if err != nil {
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return err
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}
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wctx, cancel := context.WithTimeout(ctx, pollParams.CreationTimeout)
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defer cancel()
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ticker := time.NewTimer(pollParams.PollInterval)
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defer ticker.Stop()
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wdone := wctx.Done()
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done := ctx.Done()
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for {
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select {
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case <-done:
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return ctx.Err()
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case <-wdone:
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return wctx.Err()
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case <-ticker.C:
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_, err = conn.GetContainer(ctx, cid)
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if err == nil {
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return nil
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}
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ticker.Reset(pollParams.PollInterval)
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}
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}
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}
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// Cloce closes the pool and releases all the associated resources.
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func (p *pool) Close() {
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p.cancel()
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<-p.closedCh
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}
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