mleku
7112930f73
- pkg/protocol/ws/pool.go - Added `SimplePool` struct to manage connections to multiple relays. - Introduced associated methods for relay connection, publishing, and subscribing. - Added middleware support for events, duplicates, and queries. - Implemented penalty box for managing failed relay connections. - Provided various options for customizing behavior (e.g. relays, authentication, event handling). - pkg/protocol/ws/subscription.go - Removed unnecessary `ReplaceableKey` struct. - Cleaned up redundant spaces and comments in subscription methods.
853 lines
20 KiB
Go
853 lines
20 KiB
Go
package ws
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import (
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"errors"
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"fmt"
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"math"
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"net/http"
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"orly.dev/pkg/encoders/event"
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"orly.dev/pkg/encoders/filter"
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"orly.dev/pkg/encoders/filters"
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"orly.dev/pkg/encoders/kind"
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"orly.dev/pkg/encoders/timestamp"
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"orly.dev/pkg/interfaces/signer"
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"orly.dev/pkg/utils/context"
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"orly.dev/pkg/utils/log"
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"orly.dev/pkg/utils/normalize"
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"slices"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"unsafe"
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"github.com/puzpuzpuz/xsync/v3"
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)
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const (
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seenAlreadyDropTick = time.Minute
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)
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// SimplePool manages connections to multiple relays, ensures they are reopened when necessary and not duplicated.
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type SimplePool struct {
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Relays *xsync.MapOf[string, *Client]
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Context context.T
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authHandler signer.I
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cancel context.C
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eventMiddleware func(RelayEvent)
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duplicateMiddleware func(relay string, id string)
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queryMiddleware func(relay string, pubkey []byte, k *kind.T)
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// custom things not often used
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penaltyBoxMu sync.Mutex
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penaltyBox map[string][2]float64
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relayOptions []RelayOption
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}
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// DirectedFilter combines a Filter with a specific relay URL.
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type DirectedFilter struct {
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Filter *filter.F
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Relay string
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}
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// RelayEvent represents an event received from a specific relay.
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type RelayEvent struct {
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*event.E
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Relay *Client
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}
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func (ie RelayEvent) String() string {
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return fmt.Sprintf(
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"[%s] >> %s", ie.Relay.URL, ie.E.Serialize(),
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)
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}
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// PoolOption is an interface for options that can be applied to a SimplePool.
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type PoolOption interface {
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ApplyPoolOption(*SimplePool)
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}
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// NewSimplePool creates a new SimplePool with the given context and options.
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func NewSimplePool(ctx context.T, opts ...PoolOption) *SimplePool {
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ctx, cancel := context.Cause(ctx)
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pool := &SimplePool{
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Relays: xsync.NewMapOf[string, *Client](),
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Context: ctx,
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cancel: cancel,
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}
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for _, opt := range opts {
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opt.ApplyPoolOption(pool)
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}
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return pool
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}
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// WithRelayOptions sets options that will be used on every relay instance created by this pool.
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func WithRelayOptions(ropts ...RelayOption) withRelayOptionsOpt {
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return ropts
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}
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type withRelayOptionsOpt []RelayOption
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func (h withRelayOptionsOpt) ApplyPoolOption(pool *SimplePool) {
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pool.relayOptions = h
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}
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// WithAuthHandler must be a function that signs the auth event when called.
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// it will be called whenever any relay in the pool returns a `CLOSED` message
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// with the "auth-required:" prefix, only once for each relay
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type WithAuthHandler struct {
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signer.I
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}
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func (h *WithAuthHandler) ApplyPoolOption(pool *SimplePool) {
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pool.authHandler = h.I
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}
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// WithPenaltyBox just sets the penalty box mechanism so relays that fail to connect
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// or that disconnect will be ignored for a while and we won't attempt to connect again.
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func WithPenaltyBox() withPenaltyBoxOpt { return withPenaltyBoxOpt{} }
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type withPenaltyBoxOpt struct{}
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func (h withPenaltyBoxOpt) ApplyPoolOption(pool *SimplePool) {
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pool.penaltyBox = make(map[string][2]float64)
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go func() {
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sleep := 30.0
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for {
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time.Sleep(time.Duration(sleep) * time.Second)
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pool.penaltyBoxMu.Lock()
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nextSleep := 300.0
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for url, v := range pool.penaltyBox {
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remainingSeconds := v[1]
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remainingSeconds -= sleep
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if remainingSeconds <= 0 {
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pool.penaltyBox[url] = [2]float64{v[0], 0}
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continue
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} else {
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pool.penaltyBox[url] = [2]float64{v[0], remainingSeconds}
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}
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if remainingSeconds < nextSleep {
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nextSleep = remainingSeconds
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}
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}
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sleep = nextSleep
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pool.penaltyBoxMu.Unlock()
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}
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}()
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}
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// WithEventMiddleware is a function that will be called with all events received.
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type WithEventMiddleware func(RelayEvent)
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func (h WithEventMiddleware) ApplyPoolOption(pool *SimplePool) {
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pool.eventMiddleware = h
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}
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// WithDuplicateMiddleware is a function that will be called with all duplicate ids received.
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type WithDuplicateMiddleware func(relay string, id string)
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func (h WithDuplicateMiddleware) ApplyPoolOption(pool *SimplePool) {
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pool.duplicateMiddleware = h
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}
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// WithAuthorKindQueryMiddleware is a function that will be called with every combination of relay+pubkey+kind queried
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// in a .SubMany*() call -- when applicable (i.e. when the query contains a pubkey and a kind).
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type WithAuthorKindQueryMiddleware func(
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relay string, pubkey []byte, kind *kind.T,
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)
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func (h WithAuthorKindQueryMiddleware) ApplyPoolOption(pool *SimplePool) {
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pool.queryMiddleware = h
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}
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type WithAuthMiddleware func(RelayEvent) error
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var (
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_ PoolOption = (*WithAuthHandler)(nil)
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_ PoolOption = (WithEventMiddleware)(nil)
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_ PoolOption = WithPenaltyBox()
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_ PoolOption = WithRelayOptions(WithRequestHeader(http.Header{}))
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)
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const MAX_LOCKS = 50
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var (
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namedMutexPool = make([]sync.Mutex, MAX_LOCKS)
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)
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//go:noescape
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//go:linkname memhash runtime.memhash
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func memhash(p unsafe.Pointer, h, s uintptr) uintptr
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func namedLock(name string) (unlock func()) {
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sptr := unsafe.StringData(name)
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idx := uint64(
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memhash(
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unsafe.Pointer(sptr), 0, uintptr(len(name)),
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),
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) % MAX_LOCKS
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namedMutexPool[idx].Lock()
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return namedMutexPool[idx].Unlock
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}
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// EnsureRelay ensures that a relay connection exists and is active.
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// If the relay is not connected, it attempts to connect.
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func (pool *SimplePool) EnsureRelay(url string) (*Client, error) {
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nm := string(normalize.URL(url))
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defer namedLock(nm)()
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relay, ok := pool.Relays.Load(nm)
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if ok && relay == nil {
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if pool.penaltyBox != nil {
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pool.penaltyBoxMu.Lock()
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defer pool.penaltyBoxMu.Unlock()
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v, _ := pool.penaltyBox[nm]
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if v[1] > 0 {
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return nil, fmt.Errorf("in penalty box, %fs remaining", v[1])
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}
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}
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} else if ok && relay.IsConnected() {
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// already connected, unlock and return
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return relay, nil
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}
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// try to connect
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// we use this ctx here so when the pool dies everything dies
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ctx, cancel := context.TimeoutCause(
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pool.Context,
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time.Second*15,
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errors.New("connecting to the relay took too long"),
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)
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defer cancel()
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relay = NewRelay(context.Bg(), url, pool.relayOptions...)
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if err := relay.Connect(ctx); err != nil {
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if pool.penaltyBox != nil {
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// putting relay in penalty box
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pool.penaltyBoxMu.Lock()
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defer pool.penaltyBoxMu.Unlock()
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v, _ := pool.penaltyBox[nm]
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pool.penaltyBox[nm] = [2]float64{
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v[0] + 1, 30.0 + math.Pow(2, v[0]+1),
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}
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}
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return nil, fmt.Errorf("failed to connect: %w", err)
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}
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pool.Relays.Store(nm, relay)
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return relay, nil
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}
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// PublishResult represents the result of publishing an event to a relay.
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type PublishResult struct {
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Error error
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RelayURL string
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Relay *Client
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}
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// PublishMany publishes an event to multiple relays and returns a channel of results emitted as they're received.
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func (pool *SimplePool) PublishMany(
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ctx context.T, urls []string, evt *event.E,
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) chan PublishResult {
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ch := make(chan PublishResult, len(urls))
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wg := sync.WaitGroup{}
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wg.Add(len(urls))
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go func() {
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for _, url := range urls {
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go func() {
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defer wg.Done()
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relay, err := pool.EnsureRelay(url)
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if err != nil {
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ch <- PublishResult{err, url, nil}
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return
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}
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if err := relay.Publish(ctx, evt); err == nil {
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// success with no auth required
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ch <- PublishResult{nil, url, relay}
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} else if strings.HasPrefix(
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err.Error(), "msg: auth-required:",
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) && pool.authHandler != nil {
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// try to authenticate if we can
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if authErr := relay.Auth(
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ctx, pool.authHandler,
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); authErr == nil {
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if err := relay.Publish(ctx, evt); err == nil {
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// success after auth
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ch <- PublishResult{nil, url, relay}
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} else {
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// failure after auth
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ch <- PublishResult{err, url, relay}
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}
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} else {
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// failure to auth
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ch <- PublishResult{
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fmt.Errorf(
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"failed to auth: %w", authErr,
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), url, relay,
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}
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}
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} else {
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// direct failure
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ch <- PublishResult{err, url, relay}
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}
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}()
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}
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wg.Wait()
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close(ch)
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}()
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return ch
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}
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// SubscribeMany opens a subscription with the given filter to multiple relays
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// the subscriptions ends when the context is canceled or when all relays return a CLOSED.
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func (pool *SimplePool) SubscribeMany(
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ctx context.T,
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urls []string,
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filter *filter.F,
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opts ...SubscriptionOption,
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) chan RelayEvent {
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return pool.subMany(ctx, urls, filters.New(filter), nil, opts...)
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}
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// FetchMany opens a subscription, much like SubscribeMany, but it ends as soon as all Relays
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// return an EOSE message.
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func (pool *SimplePool) FetchMany(
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ctx context.T,
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urls []string,
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filter *filter.F,
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opts ...SubscriptionOption,
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) chan RelayEvent {
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return pool.SubManyEose(ctx, urls, filters.New(filter), opts...)
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}
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// Deprecated: SubMany is deprecated: use SubscribeMany instead.
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func (pool *SimplePool) SubMany(
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ctx context.T,
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urls []string,
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filters *filters.T,
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opts ...SubscriptionOption,
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) chan RelayEvent {
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return pool.subMany(ctx, urls, filters, nil, opts...)
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}
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// SubscribeManyNotifyEOSE is like SubscribeMany, but takes a channel that is closed when
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// all subscriptions have received an EOSE
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func (pool *SimplePool) SubscribeManyNotifyEOSE(
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ctx context.T,
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urls []string,
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filter *filter.F,
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eoseChan chan struct{},
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opts ...SubscriptionOption,
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) chan RelayEvent {
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return pool.subMany(ctx, urls, filters.New(filter), eoseChan, opts...)
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}
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type ReplaceableKey struct {
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PubKey string
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D string
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}
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// FetchManyReplaceable is like FetchMany, but deduplicates replaceable and addressable events and returns
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// only the latest for each "d" tag.
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func (pool *SimplePool) FetchManyReplaceable(
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ctx context.T,
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urls []string,
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filter *filter.F,
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opts ...SubscriptionOption,
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) *xsync.MapOf[ReplaceableKey, *event.E] {
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ctx, cancel := context.Cause(ctx)
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results := xsync.NewMapOf[ReplaceableKey, *event.E]()
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wg := sync.WaitGroup{}
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wg.Add(len(urls))
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seenAlreadyLatest := xsync.NewMapOf[ReplaceableKey, *timestamp.T]()
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opts = append(
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opts, WithCheckDuplicateReplaceable(
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func(rk ReplaceableKey, ts *timestamp.T) bool {
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updated := false
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seenAlreadyLatest.Compute(
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rk, func(latest *timestamp.T, _ bool) (
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newValue *timestamp.T, delete bool,
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) {
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if ts.I64() > latest.I64() {
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updated = true // we are updating the most recent
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return ts, false
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}
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return latest, false // the one we had was already more recent
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},
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)
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return updated
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},
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),
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)
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for _, url := range urls {
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go func(nm string) {
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defer wg.Done()
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if mh := pool.queryMiddleware; mh != nil {
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if filter.Kinds != nil && filter.Authors != nil {
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for _, kind := range filter.Kinds.K {
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for _, author := range filter.Authors.ToSliceOfBytes() {
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mh(nm, author, kind)
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}
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}
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}
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}
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relay, err := pool.EnsureRelay(nm)
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if err != nil {
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log.D.F("error connecting to %s with %v: %s", nm, filter, err)
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return
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}
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hasAuthed := false
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subscribe:
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sub, err := relay.Subscribe(ctx, filters.New(filter), opts...)
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if err != nil {
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log.D.F(
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"error subscribing to %s with %v: %s", relay, filter, err,
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)
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return
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}
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for {
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select {
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case <-ctx.Done():
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return
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case <-sub.EndOfStoredEvents:
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return
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case reason := <-sub.ClosedReason:
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if strings.HasPrefix(
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reason, "auth-required:",
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) && pool.authHandler != nil && !hasAuthed {
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// relay is requesting auth. if we can we will perform auth and try again
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err = relay.Auth(ctx, pool.authHandler)
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if err == nil {
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hasAuthed = true // so we don't keep doing AUTH again and again
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goto subscribe
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}
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}
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log.D.F("CLOSED from %s: '%s'\n", nm, reason)
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return
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case evt, more := <-sub.Events:
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if !more {
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return
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}
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ie := RelayEvent{E: evt, Relay: relay}
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if mh := pool.eventMiddleware; mh != nil {
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mh(ie)
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}
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results.Store(
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ReplaceableKey{evt.PubKeyString(), evt.Tags.GetD()},
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evt,
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)
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}
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}
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}(string(normalize.URL(url)))
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}
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// this will happen when all subscriptions get an eose (or when they die)
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wg.Wait()
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cancel(errors.New("all subscriptions ended"))
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return results
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}
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func (pool *SimplePool) subMany(
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ctx context.T,
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urls []string,
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filters *filters.T,
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eoseChan chan struct{},
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opts ...SubscriptionOption,
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) chan RelayEvent {
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ctx, cancel := context.Cause(ctx)
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_ = cancel // do this so `go vet` will stop complaining
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events := make(chan RelayEvent)
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seenAlready := xsync.NewMapOf[string, *timestamp.T]()
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ticker := time.NewTicker(seenAlreadyDropTick)
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eoseWg := sync.WaitGroup{}
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eoseWg.Add(len(urls))
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if eoseChan != nil {
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go func() {
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eoseWg.Wait()
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close(eoseChan)
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}()
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}
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pending := xsync.NewCounter()
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pending.Add(int64(len(urls)))
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for i, url := range urls {
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url = string(normalize.URL(url))
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urls[i] = url
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if idx := slices.Index(urls, url); idx != i {
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// skip duplicate relays in the list
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eoseWg.Done()
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continue
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}
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eosed := atomic.Bool{}
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firstConnection := true
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go func(nm string) {
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defer func() {
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pending.Dec()
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if pending.Value() == 0 {
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close(events)
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cancel(fmt.Errorf("aborted: %w", context.GetCause(ctx)))
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}
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if eosed.CompareAndSwap(false, true) {
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eoseWg.Done()
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}
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}()
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hasAuthed := false
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interval := 3 * time.Second
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for {
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select {
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case <-ctx.Done():
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return
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default:
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}
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var sub *Subscription
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if mh := pool.queryMiddleware; mh != nil {
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for _, filter := range filters.F {
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if filter.Kinds != nil && filter.Authors != nil {
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for _, kind := range filter.Kinds.K {
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for _, author := range filter.Authors.ToSliceOfBytes() {
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mh(nm, author, kind)
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}
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}
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}
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}
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}
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relay, err := pool.EnsureRelay(nm)
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if err != nil {
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// if we never connected to this just fail
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if firstConnection {
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return
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}
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// otherwise (if we were connected and got disconnected) keep trying to reconnect
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log.D.F("%s reconnecting because connection failed\n", nm)
|
|
goto reconnect
|
|
}
|
|
firstConnection = false
|
|
hasAuthed = false
|
|
|
|
subscribe:
|
|
sub, err = relay.Subscribe(
|
|
ctx, filters, append(
|
|
opts, WithCheckDuplicate(
|
|
func(id, relay string) bool {
|
|
_, exists := seenAlready.Load(id)
|
|
if exists && pool.duplicateMiddleware != nil {
|
|
pool.duplicateMiddleware(relay, id)
|
|
}
|
|
return exists
|
|
},
|
|
),
|
|
)...,
|
|
)
|
|
if err != nil {
|
|
log.D.F("%s reconnecting because subscription died\n", nm)
|
|
goto reconnect
|
|
}
|
|
|
|
go func() {
|
|
<-sub.EndOfStoredEvents
|
|
|
|
// guard here otherwise a resubscription will trigger a duplicate call to eoseWg.Done()
|
|
if eosed.CompareAndSwap(false, true) {
|
|
eoseWg.Done()
|
|
}
|
|
}()
|
|
|
|
// reset interval when we get a good subscription
|
|
interval = 3 * time.Second
|
|
|
|
for {
|
|
select {
|
|
case evt, more := <-sub.Events:
|
|
if !more {
|
|
// this means the connection was closed for weird reasons, like the server shut down
|
|
// so we will update the filters here to include only events seem from now on
|
|
// and try to reconnect until we succeed
|
|
now := timestamp.Now()
|
|
for i := range filters.F {
|
|
filters.F[i].Since = now
|
|
}
|
|
log.D.F(
|
|
"%s reconnecting because sub.Events is broken\n",
|
|
nm,
|
|
)
|
|
goto reconnect
|
|
}
|
|
|
|
ie := RelayEvent{E: evt, Relay: relay}
|
|
if mh := pool.eventMiddleware; mh != nil {
|
|
mh(ie)
|
|
}
|
|
|
|
select {
|
|
case events <- ie:
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
case <-ticker.C:
|
|
if eosed.Load() {
|
|
old := timestamp.New(time.Now().Add(-seenAlreadyDropTick).Unix())
|
|
for id, value := range seenAlready.Range {
|
|
if value.I64() < old.I64() {
|
|
seenAlready.Delete(id)
|
|
}
|
|
}
|
|
}
|
|
case reason := <-sub.ClosedReason:
|
|
if strings.HasPrefix(
|
|
reason, "auth-required:",
|
|
) && pool.authHandler != nil && !hasAuthed {
|
|
// relay is requesting auth. if we can we will perform auth and try again
|
|
err := relay.Auth(
|
|
ctx, pool.authHandler,
|
|
)
|
|
if err == nil {
|
|
hasAuthed = true // so we don't keep doing AUTH again and again
|
|
goto subscribe
|
|
}
|
|
} else {
|
|
log.D.F("CLOSED from %s: '%s'\n", nm, reason)
|
|
}
|
|
|
|
return
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
}
|
|
|
|
reconnect:
|
|
// we will go back to the beginning of the loop and try to connect again and again
|
|
// until the context is canceled
|
|
time.Sleep(interval)
|
|
interval = interval * 17 / 10 // the next time we try we will wait longer
|
|
}
|
|
}(url)
|
|
}
|
|
|
|
return events
|
|
}
|
|
|
|
// Deprecated: SubManyEose is deprecated: use FetchMany instead.
|
|
func (pool *SimplePool) SubManyEose(
|
|
ctx context.T,
|
|
urls []string,
|
|
filters *filters.T,
|
|
opts ...SubscriptionOption,
|
|
) chan RelayEvent {
|
|
seenAlready := xsync.NewMapOf[string, struct{}]()
|
|
return pool.subManyEoseNonOverwriteCheckDuplicate(
|
|
ctx, urls, filters,
|
|
WithCheckDuplicate(
|
|
func(id, relay string) bool {
|
|
_, exists := seenAlready.LoadOrStore(id, struct{}{})
|
|
if exists && pool.duplicateMiddleware != nil {
|
|
pool.duplicateMiddleware(relay, id)
|
|
}
|
|
return exists
|
|
},
|
|
),
|
|
opts...,
|
|
)
|
|
}
|
|
|
|
func (pool *SimplePool) subManyEoseNonOverwriteCheckDuplicate(
|
|
ctx context.T,
|
|
urls []string,
|
|
filters *filters.T,
|
|
wcd WithCheckDuplicate,
|
|
opts ...SubscriptionOption,
|
|
) chan RelayEvent {
|
|
ctx, cancel := context.Cause(ctx)
|
|
|
|
events := make(chan RelayEvent)
|
|
wg := sync.WaitGroup{}
|
|
wg.Add(len(urls))
|
|
|
|
opts = append(opts, wcd)
|
|
|
|
go func() {
|
|
// this will happen when all subscriptions get an eose (or when they die)
|
|
wg.Wait()
|
|
cancel(errors.New("all subscriptions ended"))
|
|
close(events)
|
|
}()
|
|
|
|
for _, url := range urls {
|
|
go func(nm string) {
|
|
defer wg.Done()
|
|
|
|
if mh := pool.queryMiddleware; mh != nil {
|
|
for _, filter := range filters.F {
|
|
if filter.Kinds != nil && filter.Authors != nil {
|
|
for _, kind := range filter.Kinds.K {
|
|
for _, author := range filter.Authors.ToSliceOfBytes() {
|
|
mh(nm, author, kind)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
relay, err := pool.EnsureRelay(nm)
|
|
if err != nil {
|
|
log.D.F(
|
|
"error connecting to %s with %v: %s", nm, filters, err,
|
|
)
|
|
return
|
|
}
|
|
|
|
hasAuthed := false
|
|
|
|
subscribe:
|
|
sub, err := relay.Subscribe(ctx, filters, opts...)
|
|
if err != nil {
|
|
log.D.F(
|
|
"error subscribing to %s with %v: %s", relay, filters, err,
|
|
)
|
|
return
|
|
}
|
|
|
|
for {
|
|
select {
|
|
case <-ctx.Done():
|
|
return
|
|
case <-sub.EndOfStoredEvents:
|
|
return
|
|
case reason := <-sub.ClosedReason:
|
|
if strings.HasPrefix(
|
|
reason, "auth-required:",
|
|
) && pool.authHandler != nil && !hasAuthed {
|
|
// relay is requesting auth. if we can we will perform auth and try again
|
|
err := relay.Auth(
|
|
ctx, pool.authHandler,
|
|
)
|
|
if err == nil {
|
|
hasAuthed = true // so we don't keep doing AUTH again and again
|
|
goto subscribe
|
|
}
|
|
}
|
|
log.D.F("CLOSED from %s: '%s'\n", nm, reason)
|
|
return
|
|
case evt, more := <-sub.Events:
|
|
if !more {
|
|
return
|
|
}
|
|
|
|
ie := RelayEvent{E: evt, Relay: relay}
|
|
if mh := pool.eventMiddleware; mh != nil {
|
|
mh(ie)
|
|
}
|
|
|
|
select {
|
|
case events <- ie:
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}(string(normalize.URL(url)))
|
|
}
|
|
|
|
return events
|
|
}
|
|
|
|
// QuerySingle returns the first event returned by the first relay, cancels everything else.
|
|
func (pool *SimplePool) QuerySingle(
|
|
ctx context.T,
|
|
urls []string,
|
|
filter *filter.F,
|
|
opts ...SubscriptionOption,
|
|
) *RelayEvent {
|
|
ctx, cancel := context.Cause(ctx)
|
|
for ievt := range pool.SubManyEose(
|
|
ctx, urls, filters.New(filter), opts...,
|
|
) {
|
|
cancel(errors.New("got the first event and ended successfully"))
|
|
return &ievt
|
|
}
|
|
cancel(errors.New("SubManyEose() didn't get yield events"))
|
|
return nil
|
|
}
|
|
|
|
// BatchedSubManyEose performs batched subscriptions to multiple relays with different filters.
|
|
func (pool *SimplePool) BatchedSubManyEose(
|
|
ctx context.T,
|
|
dfs []DirectedFilter,
|
|
opts ...SubscriptionOption,
|
|
) chan RelayEvent {
|
|
res := make(chan RelayEvent)
|
|
wg := sync.WaitGroup{}
|
|
wg.Add(len(dfs))
|
|
seenAlready := xsync.NewMapOf[string, struct{}]()
|
|
|
|
for _, df := range dfs {
|
|
go func(df DirectedFilter) {
|
|
for ie := range pool.subManyEoseNonOverwriteCheckDuplicate(
|
|
ctx,
|
|
[]string{df.Relay},
|
|
filters.New(df.Filter),
|
|
func(id, relay string) bool {
|
|
_, exists := seenAlready.LoadOrStore(id, struct{}{})
|
|
if exists && pool.duplicateMiddleware != nil {
|
|
pool.duplicateMiddleware(relay, id)
|
|
}
|
|
return exists
|
|
}, opts...,
|
|
) {
|
|
select {
|
|
case res <- ie:
|
|
case <-ctx.Done():
|
|
wg.Done()
|
|
return
|
|
}
|
|
}
|
|
wg.Done()
|
|
}(df)
|
|
}
|
|
|
|
go func() {
|
|
wg.Wait()
|
|
close(res)
|
|
}()
|
|
|
|
return res
|
|
}
|
|
|
|
// Close closes the pool with the given reason.
|
|
func (pool *SimplePool) Close(reason string) {
|
|
pool.cancel(fmt.Errorf("pool closed with reason: '%s'", reason))
|
|
}
|