b9f7d595bd
* switch herald to herald.go * update ci/cd stuff * fix issues with binary name * we're no longer building dynamically, so turn CGO back on, and fix names * update package names in proto files
98 lines
1.7 KiB
Go
98 lines
1.7 KiB
Go
package stack
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// The db_stack package contains the implementation of a generic slice backed stack
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// used for tracking various states in the hub, i.e. headers and txcounts
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import (
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"sync"
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"github.com/lbryio/herald.go/internal"
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)
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type SliceBacked struct {
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slice []interface{}
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len uint32
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mut sync.RWMutex
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}
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func NewSliceBacked(size int) *SliceBacked {
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return &SliceBacked{
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slice: make([]interface{}, size),
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len: 0,
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mut: sync.RWMutex{},
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}
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}
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func (s *SliceBacked) Push(v interface{}) {
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s.mut.Lock()
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defer s.mut.Unlock()
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if s.len == uint32(len(s.slice)) {
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s.slice = append(s.slice, v)
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} else {
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s.slice[s.len] = v
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}
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s.len++
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}
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func (s *SliceBacked) Pop() interface{} {
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s.mut.Lock()
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defer s.mut.Unlock()
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if s.len == 0 {
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return nil
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}
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s.len--
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return s.slice[s.len]
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}
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func (s *SliceBacked) Get(i uint32) interface{} {
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s.mut.RLock()
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defer s.mut.RUnlock()
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if i >= s.len {
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return nil
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}
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return s.slice[i]
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}
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func (s *SliceBacked) GetTip() interface{} {
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s.mut.RLock()
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defer s.mut.RUnlock()
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if s.len == 0 {
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return nil
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}
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return s.slice[s.len-1]
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}
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func (s *SliceBacked) Len() uint32 {
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s.mut.RLock()
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defer s.mut.RUnlock()
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return s.len
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}
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func (s *SliceBacked) Cap() int {
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s.mut.RLock()
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defer s.mut.RUnlock()
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return cap(s.slice)
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}
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func (s *SliceBacked) GetSlice() []interface{} {
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// This is not thread safe so I won't bother with locking
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return s.slice
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}
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// This function is dangerous because it assumes underlying types
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func (s *SliceBacked) TxCountsBisectRight(txNum, rootTxNum uint32) (uint32, uint32) {
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s.mut.RLock()
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defer s.mut.RUnlock()
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txCounts := s.slice[:s.Len()]
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height := internal.BisectRight(txCounts, txNum)
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createdHeight := internal.BisectRight(txCounts, rootTxNum)
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return height, createdHeight
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}
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