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package main
import (
"database/sql"
"log"
_ "github.com/lib/pq"
)
type Session struct {
Id string
UserId int64
}
type User struct {
Id int64
Name string
Password []byte
}
type Store interface {
GetSession(id string) (*Session, bool)
NewSession(userId int64) *Session
GetUser(name string) (*User, bool)
}
type PgStore struct {
*sql.DB
sessionCache map[string]*Session
}
func NewPgStore(database string) *PgStore {
db, err := sql.Open("postgres", database)
if err != nil {
log.Panic(err)
}
return &PgStore{db, make(map[string]*Session)}
}
func (store *PgStore) GetSession(id string) (*Session, bool) {
s, ok := store.sessionCache[id]
if ok {
return s, true
}
s = new(Session)
row := store.QueryRow("SELECT id, user_id FROM sessions WHERE id = $1", id)
if err := row.Scan(&s.Id, &s.UserId); err != nil {
return nil, false
}
store.sessionCache[s.Id] = s
return s, true
}
func (store *PgStore) NewSession(userId int64) *Session {
var id string
store.QueryRow("INSERT INTO sessions(user_id) VALUES ($1) RETURNING id", userId).Scan(&id)
s := &Session{id, userId}
store.sessionCache[s.Id] = s
return s
}
func (store *PgStore) GetUser(name string) (*User, bool) {
u := &User{Name: name}
row := store.QueryRow("SELECT id, password FROM users WHERE name = $1", name)
if err := row.Scan(&u.Id, &u.Password); err != nil {
return nil, false
}
return u, true
}
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