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sqlite.go
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sqlite.go
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package main
import (
"database/sql"
_ "github.com/mattn/go-sqlite3"
)
type IPRecord struct {
Addr string
Created string
}
type storage interface {
latest() (*IPRecord, error)
insert(string) error
history() ([]IPRecord, error)
close()
}
type sqliteDB struct {
db *sql.DB
}
func newDB(path string) (storage, error) {
db, err := sql.Open("sqlite3", path)
sqlStmt := `
CREATE TABLE IF NOT EXISTS ipwatcher (
id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
ip TEXT NOT NULL,
date_created DATATIME DEFAULT CURRENT_TIMESTAMP);
`
_, err = db.Exec(sqlStmt)
if err != nil {
return nil, err
}
s := sqliteDB{
db: db,
}
return s, err
}
func (s sqliteDB) latest() (*IPRecord, error) {
var last_ip, date_created string
err := s.db.QueryRow("SELECT ip, date_created FROM ipwatcher ORDER BY id DESC LIMIT 0,1").Scan(&last_ip, &date_created)
if err != nil {
if err == sql.ErrNoRows { // http://go-database-sql.org/errors.html
err = nil
}
return nil, err
}
result := &IPRecord{
Addr: last_ip,
Created: date_created,
}
return result, nil
}
func (s sqliteDB) insert(ipAddr string) error {
tx, err := s.db.Begin()
if err != nil {
return err
}
stmt, err := tx.Prepare("insert into ipwatcher(ip) values(?)")
if err != nil {
return err
}
defer stmt.Close()
_, err = stmt.Exec(ipAddr)
if err != nil {
return err
}
return tx.Commit()
}
func (s sqliteDB) history() ([]IPRecord, error) {
rows, err := s.db.Query("SELECT ip, date_created FROM ipwatcher ORDER BY id DESC LIMIT 0,50")
if err != nil {
if err == sql.ErrNoRows { // http://go-database-sql.org/errors.html
err = nil
}
return nil, err
}
defer rows.Close()
result := []IPRecord{}
for rows.Next() {
var last_ip, date_created string
err := rows.Scan(&last_ip, &date_created)
if err != nil {
return nil, err
}
r := IPRecord{
Addr: last_ip,
Created: date_created,
}
result = append(result, r)
}
err = rows.Err()
if err != nil {
return nil, err
}
return result, nil
}
func (s sqliteDB) close() {
s.db.Close()
}