347 lines
7.1 KiB
Go
347 lines
7.1 KiB
Go
package pool
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import (
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"context"
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"crypto/ecdsa"
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crand "crypto/rand"
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"encoding/binary"
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"math/rand"
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"sort"
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"sync"
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"time"
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"google.golang.org/grpc/grpclog"
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"github.com/nspcc-dev/neofs-api-go/service"
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"github.com/nspcc-dev/neofs-api-go/state"
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"github.com/pkg/errors"
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"go.uber.org/atomic"
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"go.uber.org/zap"
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"google.golang.org/grpc"
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"google.golang.org/grpc/connectivity"
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"google.golang.org/grpc/keepalive"
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)
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type (
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node struct {
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index int32
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address string
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weight uint32
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usedAt time.Time
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conn *grpc.ClientConn
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}
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Client interface {
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GetConnection(context.Context) (*grpc.ClientConn, error)
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}
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Pool interface {
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Client
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Close()
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Status() error
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ReBalance(ctx context.Context)
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}
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Peer struct {
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Address string
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Weight float64
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}
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Config struct {
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keepalive.ClientParameters
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ConnectionTTL time.Duration
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ConnectTimeout time.Duration
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RequestTimeout time.Duration
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Peers []Peer
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GRPCVerbose bool
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GRPCLogger grpclog.LoggerV2
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Logger *zap.Logger
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PrivateKey *ecdsa.PrivateKey
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}
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pool struct {
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log *zap.Logger
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ttl time.Duration
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conTimeout time.Duration
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reqTimeout time.Duration
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opts keepalive.ClientParameters
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currentIdx *atomic.Int32
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currentConn *grpc.ClientConn
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reqHealth *state.HealthRequest
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*sync.Mutex
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nodes []*node
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keys []uint32
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conns map[uint32][]*node
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unhealthy *atomic.Error
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}
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)
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var (
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errBootstrapping = errors.New("bootstrapping")
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errEmptyConnection = errors.New("empty connection")
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errNoHealthyConnections = errors.New("no active connections")
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)
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func New(cfg *Config) (Pool, error) {
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p := &pool{
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log: cfg.Logger,
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Mutex: new(sync.Mutex),
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keys: make([]uint32, 0),
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nodes: make([]*node, 0),
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conns: make(map[uint32][]*node),
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currentIdx: atomic.NewInt32(-1),
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ttl: cfg.ConnectionTTL,
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conTimeout: cfg.ConnectTimeout,
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reqTimeout: cfg.RequestTimeout,
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opts: cfg.ClientParameters,
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unhealthy: atomic.NewError(errBootstrapping),
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}
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if cfg.GRPCVerbose {
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grpclog.SetLoggerV2(cfg.GRPCLogger)
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}
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buf := make([]byte, 8)
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if _, err := crand.Read(buf); err != nil {
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return nil, err
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}
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seed := binary.BigEndian.Uint64(buf)
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rand.Seed(int64(seed))
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cfg.Logger.Info("used random seed", zap.Uint64("seed", seed))
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p.reqHealth = new(state.HealthRequest)
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p.reqHealth.SetTTL(service.NonForwardingTTL)
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if err := service.SignRequestData(cfg.PrivateKey, p.reqHealth); err != nil {
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return nil, errors.Wrap(err, "could not sign `HealthRequest`")
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}
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for i := range cfg.Peers {
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if cfg.Peers[i].Address == "" {
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cfg.Logger.Warn("skip, empty address")
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break
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}
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p.nodes = append(p.nodes, &node{
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index: int32(i),
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address: cfg.Peers[i].Address,
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weight: uint32(cfg.Peers[i].Weight * 100),
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})
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cfg.Logger.Info("add new peer",
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zap.String("address", p.nodes[i].address),
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zap.Uint32("weight", p.nodes[i].weight))
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}
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return p, nil
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}
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func (p *pool) Status() error {
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return p.unhealthy.Load()
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}
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func (p *pool) Close() {
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p.Lock()
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defer p.Unlock()
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for i := range p.nodes {
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if p.nodes[i] == nil || p.nodes[i].conn == nil {
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continue
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}
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p.log.Warn("close connection",
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zap.String("address", p.nodes[i].address),
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zap.Error(p.nodes[i].conn.Close()))
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}
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}
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func (p *pool) ReBalance(ctx context.Context) {
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p.Lock()
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defer func() {
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p.Unlock()
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_, err := p.GetConnection(ctx)
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p.unhealthy.Store(err)
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}()
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keys := make(map[uint32]struct{})
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p.log.Debug("re-balancing connections")
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for i := range p.nodes {
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var (
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idx = -1
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exists bool
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err error
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start = time.Now()
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conn = p.nodes[i].conn
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weight = p.nodes[i].weight
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)
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if err = ctx.Err(); err != nil {
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p.log.Warn("something went wrong", zap.Error(err))
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p.unhealthy.Store(err)
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return
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}
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if conn == nil {
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p.log.Debug("empty connection, try to connect",
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zap.String("address", p.nodes[i].address))
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ctx, cancel := context.WithTimeout(ctx, p.conTimeout)
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conn, err = grpc.DialContext(ctx, p.nodes[i].address,
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grpc.WithBlock(),
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grpc.WithInsecure(),
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grpc.WithKeepaliveParams(p.opts))
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cancel()
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if err != nil || conn == nil {
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p.log.Warn("skip, could not connect to node",
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zap.String("address", p.nodes[i].address),
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zap.Stringer("elapsed", time.Since(start)),
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zap.Error(err))
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continue
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}
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p.nodes[i].conn = conn
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p.nodes[i].usedAt = time.Now()
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p.log.Debug("connected to node", zap.String("address", p.nodes[i].address))
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}
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for j := range p.conns[weight] {
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if p.conns[weight][j] != nil && p.conns[weight][j].conn == conn {
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idx = j
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exists = true
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break
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}
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}
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usedAt := time.Since(p.nodes[i].usedAt)
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// if something wrong with connection (bad state, unhealthy or not used a long time), try to close it and remove
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if err = p.isAlive(ctx, conn); err != nil || usedAt > p.ttl {
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p.log.Warn("connection not alive",
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zap.String("address", p.nodes[i].address),
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zap.Stringer("since", usedAt),
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zap.Error(err))
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if exists {
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// remove from connections
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p.conns[weight] = append(p.conns[weight][:idx], p.conns[weight][idx+1:]...)
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}
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if err = conn.Close(); err != nil {
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p.log.Warn("could not close bad connection",
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zap.String("address", p.nodes[i].address),
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zap.Stringer("since", usedAt),
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zap.Error(err))
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}
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if p.nodes[i].conn != nil {
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p.nodes[i].conn = nil
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}
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continue
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}
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keys[weight] = struct{}{}
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p.log.Debug("connection alive",
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zap.String("address", p.nodes[i].address),
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zap.Stringer("since", usedAt))
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if !exists {
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p.conns[weight] = append(p.conns[weight], p.nodes[i])
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}
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}
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p.keys = p.keys[:0]
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for w := range keys {
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p.keys = append(p.keys, w)
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}
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sort.Slice(p.keys, func(i, j int) bool {
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return p.keys[i] > p.keys[j]
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})
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}
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func (p *pool) GetConnection(ctx context.Context) (*grpc.ClientConn, error) {
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p.Lock()
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defer p.Unlock()
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if err := p.isAlive(ctx, p.currentConn); err == nil {
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if id := p.currentIdx.Load(); id != -1 && p.nodes[id] != nil {
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p.nodes[id].usedAt = time.Now()
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}
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return p.currentConn, nil
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}
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for _, w := range p.keys {
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switch ln := len(p.conns[w]); ln {
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case 0:
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continue
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case 1:
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p.currentConn = p.conns[w][0].conn
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p.conns[w][0].usedAt = time.Now()
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p.currentIdx.Store(p.conns[w][0].index)
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return p.currentConn, nil
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default: // > 1
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i := rand.Intn(ln)
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p.currentConn = p.conns[w][i].conn
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p.conns[w][i].usedAt = time.Now()
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p.currentIdx.Store(p.conns[w][i].index)
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return p.currentConn, nil
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}
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}
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p.currentConn = nil
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p.currentIdx.Store(-1)
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if ctx.Err() != nil {
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return nil, ctx.Err()
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}
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return nil, errNoHealthyConnections
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}
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func (p *pool) isAlive(ctx context.Context, cur *grpc.ClientConn) error {
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if cur == nil {
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return errEmptyConnection
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}
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switch st := cur.GetState(); st {
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case connectivity.Idle, connectivity.Ready, connectivity.Connecting:
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ctx, cancel := context.WithTimeout(ctx, p.reqTimeout)
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defer cancel()
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res, err := state.NewStatusClient(cur).HealthCheck(ctx, p.reqHealth)
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if err != nil {
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p.log.Warn("could not fetch health-check", zap.Error(err))
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return err
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} else if !res.Healthy {
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return errors.New(res.Status)
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}
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return nil
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default:
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return errors.New(st.String())
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}
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}
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