125 lines
3.7 KiB
Go
125 lines
3.7 KiB
Go
package chaistore
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import (
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"log"
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"time"
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"github.com/chaisql/chai"
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)
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// ChaiStore represents the session store.
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type ChaiStore struct {
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db *chai.DB
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stopCleanup chan bool
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}
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// New returns a new ChaiStore instance, with a background cleanup goroutine
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// that runs every 5 minutes to remove expired session data.
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func New(db *chai.DB) *ChaiStore {
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return NewWithCleanupInterval(db, 5*time.Minute)
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}
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// NewWithCleanupInterval returns a new ChaiStore instance. The cleanupInterval
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// parameter controls how frequently expired session data is removed by the
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// background cleanup goroutine. Setting it to 0 prevents the cleanup goroutine
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// from running (i.e. expired sessions will not be removed).
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func NewWithCleanupInterval(db *chai.DB, cleanupInterval time.Duration) *ChaiStore {
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p := &ChaiStore{db: db}
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if cleanupInterval > 0 {
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go p.startCleanup(cleanupInterval)
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}
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return p
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}
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// Find returns the data for a given session token from the ChaiStore instance.
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// If the session token is not found or is expired, the returned exists flag will
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// be set to false.
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func (p *ChaiStore) Find(token string) (b []byte, exists bool, err error) {
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row, err := p.db.QueryRow("SELECT data FROM sessions WHERE token = ? AND ? < expiry", token, time.Now())
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if chai.IsNotFoundError(err) {
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return nil, false, nil
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} else if err != nil {
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return nil, false, err
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}
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return b, true, row.Scan(&b)
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}
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// Commit adds a session token and data to the ChaiStore instance with the
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// given expiry time. If the session token already exists, then the data and expiry
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// time are updated.
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func (p *ChaiStore) Commit(token string, b []byte, expiry time.Time) error {
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return p.db.Exec("INSERT INTO sessions (token, data, expiry) VALUES (?, ?, ?) ON CONFLICT REPLACE", token, b, expiry.UTC())
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}
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// Delete removes a session token and corresponding data from the ChaiStore
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// instance.
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func (p *ChaiStore) Delete(token string) error {
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return p.db.Exec("DELETE FROM sessions WHERE token = ?", token)
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}
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// All returns a map containing the token and data for all active (i.e.
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// not expired) sessions in the ChaiStore instance.
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func (p *ChaiStore) All() (map[string][]byte, error) {
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rows, err := p.db.Query("SELECT token, data FROM sessions WHERE ? < expiry", time.Now())
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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sessions := make(map[string][]byte)
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err = rows.Iterate(func(row *chai.Row) error {
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var (
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token string
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data []byte
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)
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err = row.Scan(&token, &data)
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if err != nil {
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return err
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}
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sessions[token] = data
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return nil
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})
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return sessions, err
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}
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func (p *ChaiStore) startCleanup(interval time.Duration) {
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p.stopCleanup = make(chan bool)
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ticker := time.NewTicker(interval)
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for {
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select {
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case <-ticker.C:
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err := p.deleteExpired()
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if err != nil {
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log.Println(err)
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}
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case <-p.stopCleanup:
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ticker.Stop()
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return
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}
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}
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}
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// StopCleanup terminates the background cleanup goroutine for the ChaiStore
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// instance. It's rare to terminate this; generally ChaiStore instances and
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// their cleanup goroutines are intended to be long-lived and run for the lifetime
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// of your application.
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//
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// There may be occasions though when your use of the ChaiStore is transient.
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// An example is creating a new ChaiStore instance in a test function. In this
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// scenario, the cleanup goroutine (which will run forever) will prevent the
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// ChaiStore object from being garbage collected even after the test function
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// has finished. You can prevent this by manually calling StopCleanup.
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func (p *ChaiStore) StopCleanup() {
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if p.stopCleanup != nil {
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p.stopCleanup <- true
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}
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}
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func (p *ChaiStore) deleteExpired() error {
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return p.db.Exec("DELETE FROM sessions WHERE expiry < ?", time.Now())
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}
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