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package main
import (
"database/sql"
"errors"
_ "github.com/mattn/go-sqlite3"
)
type SQLConnection struct {
db *sql.DB
}
func (conn *SQLConnection) init(dbpath string) error {
var err error
conn.db, err = sql.Open("sqlite3", dbpath)
return err
}
func (conn *SQLConnection) registerUser(username string, key string) error {
_, err := conn.db.Exec("INSERT INTO users (username, key) VALUES (?, ?)", username, key)
return err
}
func (conn *SQLConnection) checkUserRegistered(username string) (bool, error) {
result, err := conn.db.Query("SELECT username FROM users WHERE username = ?", username)
if err != nil {
return false, err
}
for result.Next() {
_ = result.Close()
return true, nil
}
return false, nil
}
func (conn *SQLConnection) getUserKey(username string) (string, error) {
query := "SELECT key FROM users WHERE username = ?"
result, err := conn.db.Query(query, username)
if err != nil {
return "", err
}
if result.Next() {
var key string
_ = result.Scan(&key)
_ = result.Close()
return key, nil
} else {
return "", errors.New("user not found")
}
}
func (conn *SQLConnection) saveMessage(message Message) error {
var err error
query := `INSERT INTO messages (userId, data, timestamp) values (
(SELECT id FROM users WHERE username = ?), ?, ?
)`
_, err = conn.db.Exec(query, message.User, message.Data, message.Timestamp)
return err
}
func (conn *SQLConnection) getMessagesSince(timestamp int64) ([]Message, error) {
var err error
var msg []Message
query := `SELECT username, data, timestamp FROM users JOIN messages
WHERE users.id = messages.userId AND timestamp > ?
ORDER BY timestamp;`
result, err := conn.db.Query(query, timestamp)
if err != nil {
return msg, err
}
for result.Next() {
var message Message
_ = result.Scan(&message.User, &message.Data, &message.Timestamp)
msg = append(msg, message)
}
_ = result.Close()
return msg, err
}
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