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buffer.go
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/
buffer.go
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package logger
import (
"fmt"
"time"
)
type buffer[T any] struct {
buffer []T
recordCh chan T
closeCh chan struct{}
}
func (c *buffer[T]) Add(r T) {
c.recordCh <- r
}
func (c *buffer[T]) Close() {
close(c.closeCh)
}
func newBuffer[T any](size int, interval time.Duration, fn func([]T) error) *buffer[T] {
c := &buffer[T]{
buffer: make([]T, 0, size),
recordCh: make(chan T, size),
closeCh: make(chan struct{}),
}
go func() {
ticker := time.NewTicker(interval)
defer ticker.Stop()
for {
select {
case r, ok := <-c.recordCh:
if !ok {
return
}
// the first condition is to be called when the buffer is already full
// and the previous flush call failed. This is to prevent the buffer to
// grow indefinitely. At this point, we start to lose logs.
if len(c.buffer) >= size {
err := fn(c.buffer)
if err != nil {
fmt.Println("retry to flush but failed to flush buffer, ", "err: ", err, ", buffer_size: ", len(c.buffer))
continue
}
fmt.Println("buffer flushed, ", "buffer_size: ", len(c.buffer))
c.buffer = c.buffer[:0]
}
c.buffer = append(c.buffer, r)
if len(c.buffer) >= size {
err := fn(c.buffer)
if err != nil {
fmt.Println("buffer reached limit but failed to flush buffer, ", "err: ", err, ", buffer_size: ", len(c.buffer))
continue
}
fmt.Println("buffer flushed, ", "buffer_size: ", len(c.buffer))
c.buffer = c.buffer[:0]
}
case <-ticker.C:
if len(c.buffer) > 0 {
err := fn(c.buffer)
if err != nil {
fmt.Println("interval happens but failed to flush buffer, ", "err: ", err, ", buffer_size: ", len(c.buffer))
continue
}
fmt.Println("buffer flushed, ", "buffer_size: ", len(c.buffer))
c.buffer = c.buffer[:0]
}
case <-c.closeCh:
return
}
}
}()
return c
}