mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2024-12-24 12:37:16 +00:00
133 lines
2.3 KiB
Go
133 lines
2.3 KiB
Go
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package rpchelper
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import (
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"context"
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"sync"
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)
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// a simple interface for subscriptions for rpc helper
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type Sub[T any] interface {
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Send(T)
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Close()
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}
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type chan_sub[T any] struct {
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ch chan T
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closed chan struct{}
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ctx context.Context
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cn context.CancelFunc
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c sync.Cond
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}
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// buffered channel
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func newChanSub[T any](size int) *chan_sub[T] {
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// set min size to 8.
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if size < 8 {
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size = 8
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}
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o := &chan_sub[T]{}
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o.ch = make(chan T, size)
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o.closed = make(chan struct{})
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o.ctx, o.cn = context.WithCancel(context.Background())
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return o
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}
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func (s *chan_sub[T]) Send(x T) {
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select {
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// if the output buffer is empty, send
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case s.ch <- x:
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// if sub is canceled, dispose message
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case <-s.ctx.Done():
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// the sub is overloaded, dispose message
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default:
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}
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}
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func (s *chan_sub[T]) Close() {
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select {
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case <-s.ctx.Done():
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return
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default:
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}
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// its possible for multiple goroutines to get to this point, if Close is called twice at the same time
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// close the context - allows any sends to exit
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s.cn()
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select {
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case s.closed <- struct{}{}:
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// but it is not possible for multiple goroutines to get to this point
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// drain the channel
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for range s.ch {
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}
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close(s.ch)
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default:
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}
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}
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func NewSyncMap[K comparable, T any]() *SyncMap[K, T] {
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return &SyncMap[K, T]{
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m: make(map[K]T),
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}
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}
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type SyncMap[K comparable, T any] struct {
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m map[K]T
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mu sync.RWMutex
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}
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func (m *SyncMap[K, T]) Get(k K) (res T, ok bool) {
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m.mu.RLock()
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defer m.mu.RUnlock()
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res, ok = m.m[k]
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return res, ok
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}
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func (m *SyncMap[K, T]) Put(k K, v T) (T, bool) {
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m.mu.Lock()
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defer m.mu.Unlock()
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old, ok := m.m[k]
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m.m[k] = v
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return old, ok
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}
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func (m *SyncMap[K, T]) Do(k K, fn func(T, bool) (T, bool)) (after T, ok bool) {
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m.mu.Lock()
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defer m.mu.Unlock()
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val, ok := m.m[k]
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nv, save := fn(val, ok)
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if save {
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m.m[k] = nv
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}
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return nv, ok
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}
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func (m *SyncMap[K, T]) DoAndStore(k K, fn func(t T, ok bool) T) (after T, ok bool) {
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return m.Do(k, func(t T, b bool) (T, bool) {
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res := fn(t, b)
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return res, true
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})
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}
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func (m *SyncMap[K, T]) Range(fn func(k K, v T) error) error {
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m.mu.RLock()
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defer m.mu.RUnlock()
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for k, v := range m.m {
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if err := fn(k, v); err != nil {
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return err
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}
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}
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return nil
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}
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func (m *SyncMap[K, T]) Delete(k K) (T, bool) {
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var t T
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m.mu.Lock()
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defer m.mu.Unlock()
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val, ok := m.m[k]
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if !ok {
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return t, false
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}
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delete(m.m, k)
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return val, true
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}
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