frostfs-sdk-go/pool/pool.go

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