140 lines
3.1 KiB
Go
140 lines
3.1 KiB
Go
package reaper
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import (
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"log"
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"time"
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"github.com/boltdb/bolt"
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"github.com/yosssi/boltstore/shared"
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)
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//##############//
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//### Public ###//
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//##############//
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// Run invokes a reap function as a goroutine.
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func Run(db *bolt.DB, options Options) (chan<- struct{}, <-chan struct{}) {
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options.setDefault()
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quitC, doneC := make(chan struct{}), make(chan struct{})
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go reap(db, options, quitC, doneC)
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return quitC, doneC
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}
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// Quit terminates the reap goroutine.
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func Quit(quitC chan<- struct{}, doneC <-chan struct{}) {
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quitC <- struct{}{}
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<-doneC
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}
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//###############//
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//### Private ###//
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//###############//
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func reap(db *bolt.DB, options Options, quitC <-chan struct{}, doneC chan<- struct{}) {
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// Create a new ticker
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ticker := time.NewTicker(options.CheckInterval)
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defer func() {
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// Stop the ticker
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ticker.Stop()
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}()
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var prevKey []byte
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for {
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select {
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case <-quitC: // Check if a quit signal is sent.
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doneC <- struct{}{}
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return
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case <-ticker.C: // Check if the ticker fires a signal.
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// This slice is a buffer to save all expired session keys.
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expiredSessionKeys := make([][]byte, 0)
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// Start a bolt read transaction.
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err := db.View(func(tx *bolt.Tx) error {
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bucket := tx.Bucket(options.BucketName)
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if bucket == nil {
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return nil
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}
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c := bucket.Cursor()
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var i int
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var isExpired bool
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for k, v := c.Seek(prevKey); ; k, v = c.Next() {
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// If we hit the end of our sessions then
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// exit and start over next time.
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if k == nil {
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prevKey = nil
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return nil
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}
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i++
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// The flag if the session is expired
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isExpired = false
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session, err := shared.Session(v)
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if err != nil {
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// Just remove the session with the invalid session data.
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// Log the error first.
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log.Printf("boltstore: removing session from database with invalid value: %v", err)
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isExpired = true
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} else if shared.Expired(session) {
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isExpired = true
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}
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if isExpired {
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// Copy the byte slice key, because this data is
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// not safe outside of this transaction.
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temp := make([]byte, len(k))
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copy(temp, k)
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// Add it to the expired sessios keys slice
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expiredSessionKeys = append(expiredSessionKeys, temp)
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}
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if options.BatchSize == i {
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// Store the current key to the previous key.
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// Copy the byte slice key, because this data is
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// not safe outside of this transaction.
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prevKey = make([]byte, len(k))
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copy(prevKey, k)
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return nil
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}
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}
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})
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if err != nil {
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log.Printf("boltstore: obtain expired sessions error: %v", err)
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}
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if len(expiredSessionKeys) > 0 {
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// Remove the expired sessions from the database
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err = db.Update(func(txu *bolt.Tx) error {
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// Get the bucket
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b := txu.Bucket(options.BucketName)
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if b == nil {
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return nil
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}
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// Remove all expired sessions in the slice
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for _, key := range expiredSessionKeys {
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err = b.Delete(key)
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if err != nil {
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return err
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}
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}
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return nil
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})
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if err != nil {
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log.Printf("boltstore: remove expired sessions error: %v", err)
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}
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}
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}
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}
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}
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