/
event_queue.go
52 lines (41 loc) · 1.01 KB
/
event_queue.go
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package chainservice
import (
"container/heap"
"sync"
"github.com/ethereum/go-ethereum/core/types"
)
type eventTracker struct {
latestBlockNum uint64
events eventQueue
mu sync.Mutex
}
func NewEventTracker(startBlock uint64) *eventTracker {
eventQueue := eventQueue{}
heap.Init(&eventQueue)
return &eventTracker{latestBlockNum: startBlock, events: eventQueue}
}
func (eT *eventTracker) Push(l types.Log) {
heap.Push(&eT.events, (l))
}
func (eT *eventTracker) Pop() types.Log {
return heap.Pop(&eT.events).(types.Log)
}
type eventQueue []types.Log
func (q eventQueue) Len() int { return len(q) }
func (q eventQueue) Less(i, j int) bool {
if q[i].BlockNumber == q[j].BlockNumber {
return i < j
}
return q[i].BlockNumber < q[j].BlockNumber
}
func (q eventQueue) Swap(i, j int) { q[i], q[j] = q[j], q[i] }
func (q *eventQueue) Push(x interface{}) {
*q = append(*q, x.(types.Log))
}
func (q *eventQueue) Pop() interface{} {
old := *q
n := len(old)
x := old[n-1]
*q = old[0 : n-1]
return x
}