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localDb.go
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localDb.go
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package LocalDb
import (
"database/sql"
_ "github.com/mattn/go-sqlite3"
"log"
)
type LocalDb interface {
Enabled() bool
Shutdown()
InfluxBacklogAdd(client, batch string) error
InfluxBacklogSize(client string) (numbBatches, numbLines uint, err error)
InfluxBacklogGet(client string) (id int, batch string, err error)
InfluxBacklogDelete(id int) error
InfluxAggregateBacklog(client string, batchSize uint) error
}
type SqliteLocalDb struct {
config Config
db *sql.DB
vacuumNeeded bool
}
type DisabledLocalDb struct{}
type Config interface {
Enabled() bool
Path() string
}
func Run(config Config) LocalDb {
if config.Enabled() {
db, err := sql.Open("sqlite3", config.Path())
if err != nil {
log.Printf("localDb: cannot start sqlite3 db: %s", err)
} else {
row := db.QueryRow("SELECT MAX(version) FROM dbSchema")
var version int
if err := row.Scan(&version); err != nil {
// create schema
if _, err := db.Exec(structure); err != nil {
log.Printf("localDb: error while creating db structure: %s", err)
} else {
log.Printf("localDb: db initialized with schema version 0")
}
} else {
log.Printf("localDb: db schema up-to-date at version: %d", version)
}
return &SqliteLocalDb{
config: config,
db: db,
vacuumNeeded: true,
}
}
}
return &DisabledLocalDb{}
}
func (d SqliteLocalDb) Enabled() bool {
return true
}
func (d SqliteLocalDb) Shutdown() {
if err := d.db.Close(); err != nil {
log.Printf("localDb: error during close: %s", err)
} else {
log.Print("localDb: closed")
}
}
func (d DisabledLocalDb) Enabled() bool {
return false
}
func (d DisabledLocalDb) Shutdown() {}