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middlewares.go
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/
middlewares.go
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package server
import (
"context"
"os"
"sync"
"github.com/Mrs4s/go-cqhttp/coolq"
"github.com/Mrs4s/go-cqhttp/global"
log "github.com/sirupsen/logrus"
"github.com/tidwall/gjson"
"golang.org/x/time/rate"
)
var (
filters = make(map[string]global.Filter)
filterMutex sync.RWMutex
)
func rateLimit(frequency float64, bucketSize int) handler {
limiter := rate.NewLimiter(rate.Limit(frequency), bucketSize)
return func(_ string, _ resultGetter) coolq.MSG {
_ = limiter.Wait(context.Background())
return nil
}
}
func addFilter(file string) {
if file == "" {
return
}
bs, err := os.ReadFile(file)
if err != nil {
log.Error("init filter error: ", err)
return
}
defer func() {
if err := recover(); err != nil {
log.Error("init filter error: ", err)
}
}()
filter := global.Generate("and", gjson.ParseBytes(bs))
filterMutex.Lock()
filters[file] = filter
filterMutex.Unlock()
}
func findFilter(file string) global.Filter {
if file == "" {
return nil
}
filterMutex.RLock()
defer filterMutex.RUnlock()
return filters[file]
}