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sqlite3.go
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package sqlite3
import (
"database/sql"
"fmt"
"time"
_ "github.com/mattn/go-sqlite3"
)
// Storage interface that is implemented by storage providers
type Storage struct {
db *sql.DB
gcInterval time.Duration
done chan struct{}
sqlSelect string
sqlInsert string
sqlDelete string
sqlReset string
sqlGC string
}
var (
checkSchemaMsg = "The `v` row has an incorrect data type. " +
"It should be BLOB but is instead %s. This will cause encoding-related panics if the DB is not migrated (see https://github.com/gofiber/storage/blob/main/MIGRATE.md)."
dropQuery = `DROP TABLE IF EXISTS %s;`
initQuery = []string{
`CREATE TABLE IF NOT EXISTS %s (
k VARCHAR(64) PRIMARY KEY NOT NULL DEFAULT '',
v BLOB NOT NULL,
e BIGINT NOT NULL DEFAULT '0'
);`,
`CREATE INDEX IF NOT EXISTS e ON %s (e);`,
}
)
// New creates a new storage
func New(config ...Config) *Storage {
// Set default config
cfg := configDefault(config...)
// Create db
db, err := sql.Open("sqlite3", cfg.Database)
if err != nil {
panic(err)
}
// Set database options
db.SetMaxOpenConns(cfg.maxOpenConns)
db.SetMaxIdleConns(cfg.maxIdleConns)
db.SetConnMaxLifetime(cfg.connMaxLifetime)
// Ping database
if err := db.Ping(); err != nil {
panic(err)
}
// Drop table if set to true
if cfg.Reset {
if _, err = db.Exec(fmt.Sprintf(dropQuery, cfg.Table)); err != nil {
_ = db.Close()
panic(err)
}
}
// Init database queries
for _, query := range initQuery {
if _, err := db.Exec(fmt.Sprintf(query, cfg.Table)); err != nil {
_ = db.Close()
panic(err)
}
}
// Create storage
store := &Storage{
db: db,
gcInterval: cfg.GCInterval,
done: make(chan struct{}),
sqlSelect: fmt.Sprintf(`SELECT v, e FROM %s WHERE k=?;`, cfg.Table),
sqlInsert: fmt.Sprintf("INSERT OR REPLACE INTO %s (k, v, e) VALUES (?,?,?)", cfg.Table),
sqlDelete: fmt.Sprintf("DELETE FROM %s WHERE k=?", cfg.Table),
sqlReset: fmt.Sprintf("DELETE FROM %s;", cfg.Table),
sqlGC: fmt.Sprintf("DELETE FROM %s WHERE e <= ? AND e != 0", cfg.Table),
}
// Start garbage collector
go store.gcTicker()
return store
}
// Get value by key
func (s *Storage) Get(key string) ([]byte, error) {
if len(key) <= 0 {
return nil, nil
}
row := s.db.QueryRow(s.sqlSelect, key)
// Add db response to data
var (
data = []byte{}
exp int64 = 0
)
if err := row.Scan(&data, &exp); err != nil {
if err == sql.ErrNoRows {
return nil, nil
}
return nil, err
}
// If the expiration time has already passed, then return nil
if exp != 0 && exp <= time.Now().Unix() {
return nil, nil
}
return data, nil
}
// Set key with value
func (s *Storage) Set(key string, val []byte, exp time.Duration) error {
// Ain't Nobody Got Time For That
if len(key) <= 0 || len(val) <= 0 {
return nil
}
var expSeconds int64
if exp != 0 {
expSeconds = time.Now().Add(exp).Unix()
}
_, err := s.db.Exec(s.sqlInsert, key, val, expSeconds)
return err
}
// Delete entry by key
func (s *Storage) Delete(key string) error {
// Ain't Nobody Got Time For That
if len(key) <= 0 {
return nil
}
_, err := s.db.Exec(s.sqlDelete, key)
return err
}
// Reset all entries, including unexpired
func (s *Storage) Reset() error {
_, err := s.db.Exec(s.sqlReset)
return err
}
// Close the database
func (s *Storage) Close() error {
s.done <- struct{}{}
return s.db.Close()
}
// gcTicker starts the gc ticker
func (s *Storage) gcTicker() {
ticker := time.NewTicker(s.gcInterval)
defer ticker.Stop()
for {
select {
case <-s.done:
return
case t := <-ticker.C:
s.gc(t)
}
}
}
// gc deletes all expired entries
func (s *Storage) gc(t time.Time) {
_, _ = s.db.Exec(s.sqlGC, t.Unix())
}