frostfs-sdk-go/pkg/pool/pool.go
Denis Kirillov 10284ddd63 [#9] Dropped direct gRPC connections
Using neofs-api-go client.New to create grpc connections.

Signed-off-by: Denis Kirillov <denis@nspcc.ru>
2021-06-09 17:27:17 +03:00

151 lines
4 KiB
Go

package pool
import (
"context"
"crypto/ecdsa"
"errors"
"fmt"
"math/rand"
"sync"
"time"
"github.com/nspcc-dev/neofs-api-go/pkg/client"
"github.com/nspcc-dev/neofs-api-go/pkg/owner"
"github.com/nspcc-dev/neofs-api-go/pkg/session"
)
// 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
}
// Builder is an interim structure used to collect node addresses/weights and
// build connection pool subsequently.
type Builder struct {
addresses []string
weights []float64
}
// 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")
}
totalWeight := 0.0
for _, w := range pb.weights {
totalWeight += w
}
for i, w := range pb.weights {
pb.weights[i] = w / totalWeight
}
options.weights = pb.weights
options.addresses = pb.addresses
return newPool(ctx, options)
}
// Pool is an interface providing connection artifacts on request.
type Pool interface {
Connection() (client.Client, *session.Token, error)
OwnerID() *owner.ID
}
type clientPack struct {
client client.Client
sessionToken *session.Token
healthy bool
}
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 := client.New(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 {
address := "unknown"
if epi, err := c.EndpointInfo(ctx); err == nil {
address = epi.NodeInfo().Address()
}
return nil, fmt.Errorf("failed to create neofs session token for client %s: %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 func() {
ticker := time.NewTimer(options.ClientRebalanceInterval)
for range ticker.C {
ok := true
for i, clientPack := range pool.clientPacks {
func() {
tctx, c := context.WithTimeout(ctx, options.NodeRequestTimeout)
defer c()
if _, err := clientPack.client.EndpointInfo(tctx); err != nil {
ok = false
}
pool.lock.Lock()
pool.clientPacks[i].healthy = ok
pool.lock.Unlock()
}()
}
ticker.Reset(options.ClientRebalanceInterval)
}
}()
return pool, nil
}
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
}