frp/utils/metric/date_counter.go

135 lines
3.0 KiB
Go

// Copyright 2017 fatedier, fatedier@gmail.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package metric
import (
"sync"
"time"
)
type DateCounter interface {
TodayCount() int64
GetLastDaysCount(lastdays int64) []int64
Inc(int64)
Dec(int64)
Snapshot() DateCounter
Clear()
}
func NewDateCounter(reserveDays int64) DateCounter {
if reserveDays <= 0 {
reserveDays = 1
}
return newStandardDateCounter(reserveDays)
}
type StandardDateCounter struct {
reserveDays int64
counts []int64
lastUpdateDate time.Time
mu sync.Mutex
}
func newStandardDateCounter(reserveDays int64) *StandardDateCounter {
now := time.Now()
now = time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
s := &StandardDateCounter{
reserveDays: reserveDays,
counts: make([]int64, reserveDays),
lastUpdateDate: now,
}
return s
}
func (c *StandardDateCounter) TodayCount() int64 {
c.mu.Lock()
defer c.mu.Unlock()
c.rotate(time.Now())
return c.counts[0]
}
func (c *StandardDateCounter) GetLastDaysCount(lastdays int64) []int64 {
if lastdays > c.reserveDays {
lastdays = c.reserveDays
}
counts := make([]int64, lastdays)
c.mu.Lock()
defer c.mu.Unlock()
c.rotate(time.Now())
for i := 0; i < int(lastdays); i++ {
counts[i] = c.counts[i]
}
return counts
}
func (c *StandardDateCounter) Inc(count int64) {
c.mu.Lock()
defer c.mu.Unlock()
c.rotate(time.Now())
c.counts[0] += count
}
func (c *StandardDateCounter) Dec(count int64) {
c.mu.Lock()
defer c.mu.Unlock()
c.rotate(time.Now())
c.counts[0] -= count
}
func (c *StandardDateCounter) Snapshot() DateCounter {
c.mu.Lock()
defer c.mu.Unlock()
tmp := newStandardDateCounter(c.reserveDays)
for i := 0; i < int(c.reserveDays); i++ {
tmp.counts[i] = c.counts[i]
}
return tmp
}
func (c *StandardDateCounter) Clear() {
c.mu.Lock()
defer c.mu.Unlock()
for i := 0; i < int(c.reserveDays); i++ {
c.counts[i] = 0
}
}
// rotate
// Must hold the lock before calling this function.
func (c *StandardDateCounter) rotate(now time.Time) {
now = time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
days := int(now.Sub(c.lastUpdateDate).Hours() / 24)
defer func() {
c.lastUpdateDate = now
}()
if days <= 0 {
return
} else if days >= int(c.reserveDays) {
c.counts = make([]int64, c.reserveDays)
return
}
newCounts := make([]int64, c.reserveDays)
for i := days; i < int(c.reserveDays); i++ {
newCounts[i] = c.counts[i-days]
}
c.counts = newCounts
}