package db import ( "context" _ "embed" "errors" "fmt" "log" "math/rand" "github.com/google/uuid" "github.com/jackc/pgx/v4/pgxpool" ) //go:embed schema.sql var schema string // TODO I have a suspicion that I'm going to want to move to an ORM like model where the object struct has a DB member and various methods on it. For now I'm just going to keep adding shit to the DB interface because if it doesn't get too long in the end then it's fine. type DB interface { // Accounts CreateAccount(string, string) (*Account, error) ValidateCredentials(string, string) (*Account, error) GetAccount(string) (*Account, error) StartSession(Account) (string, error) EndSession(string) error ActiveSessions() ([]Session, error) ClearSessions() error // General GetObject(owner, name string) (*Object, error) GetObjectByID(ID int) (*Object, error) // Defaults Ensure() error // Presence SessionIDForAvatar(Object) (string, error) AvatarBySessionID(string) (*Object, error) BedroomBySessionID(string) (*Object, error) MoveInto(toMove Object, container Object) error Earshot(Object) ([]Object, error) } type Account struct { ID int Name string Pwhash string God bool } type Session struct { ID string AccountID int } type Object struct { ID int Avatar bool Bedroom bool Data map[string]string OwnerID int Script string } type pgDB struct { pool *pgxpool.Pool } func NewDB(connURL string) (DB, error) { pool, err := pgxpool.Connect(context.Background(), connURL) if err != nil { return nil, err } pgdb := &pgDB{ pool: pool, } return pgdb, nil } // Ensure checks for and then creates default resources if they do not exist (like the Foyer) func (db *pgDB) Ensure() error { // TODO this is sloppy but shrug _, err := db.pool.Exec(context.Background(), schema) //log.Println(err) sysAcc, err := db.GetAccount("system") if err != nil { // TODO actually check error. for now assuming it means does not exist sysAcc, err = db.CreateGod("system", "") if err != nil { return fmt.Errorf("failed to create system account: %w", err) } } foyer, err := db.GetObject("system", "foyer") if err != nil { // TODO actually check error. for now assuming it means does not exist data := map[string]string{} data["name"] = "foyer" data["description"] = "a big room. the ceiling is painted with constellations." foyer = &Object{ Data: data, Script: "", // TODO default room script } if err = db.CreateObject(sysAcc, foyer); err != nil { return err } } egg, err := db.GetObject("system", "floor egg") if err != nil { // TODO actually check error. for now assuming it means does not exist data := map[string]string{} data["name"] = "floor egg" data["description"] = "it's an egg and it's on the floor." egg = &Object{ Data: data, Script: "", // TODO default room script } if err = db.CreateObject(sysAcc, egg); err != nil { return err } } sysAva, err := db.GetAccountAvatar(*sysAcc) if err != nil { return fmt.Errorf("could not find avatar for system account: %w", err) } db.MoveInto(*sysAva, *foyer) db.MoveInto(*egg, *foyer) return nil } func (db *pgDB) CreateGod(name, password string) (account *Account, err error) { account = &Account{ Name: name, Pwhash: password, God: true, } return account, db.createAccount(account) } func (db *pgDB) CreateAccount(name, password string) (account *Account, err error) { account = &Account{ Name: name, Pwhash: password, } return account, db.createAccount(account) } func (db *pgDB) createAccount(account *Account) (err error) { ctx := context.Background() tx, err := db.pool.Begin(ctx) if err != nil { return } defer tx.Rollback(ctx) stmt := "INSERT INTO accounts (name, pwhash, god) VALUES ( $1, $2, $3 ) RETURNING id" err = tx.QueryRow(ctx, stmt, account.Name, account.Pwhash, account.God).Scan(&account.ID) // TODO handle and cleanup unqiue violations if err != nil { return } data := map[string]string{} data["name"] = account.Name data["description"] = fmt.Sprintf("a gaseous form. it smells faintly of %s.", randSmell()) av := &Object{ Avatar: true, Data: data, Script: "", } av.Script = fmt.Sprintf(`%s hears(".*", function() tellMe(msg) end) sees(".*", function() showMe(msg) end) `, hasInvocation(av)) stmt = "INSERT INTO objects ( avatar, data, owner, script ) VALUES ( $1, $2, $3, $4 ) RETURNING id" err = tx.QueryRow(ctx, stmt, av.Avatar, av.Data, account.ID, av.Script).Scan(&av.ID) if err != nil { return } stmt = "INSERT INTO permissions (object) VALUES ( $1 )" _, err = tx.Exec(ctx, stmt, av.ID) if err != nil { return } data = map[string]string{} data["name"] = "your private bedroom" bedroom := &Object{ Bedroom: true, Data: data, Script: "", } stmt = "INSERT INTO objects ( bedroom, data, owner, script ) VALUES ( $1, $2, $3, $4 ) RETURNING id" err = tx.QueryRow(ctx, stmt, bedroom.Bedroom, bedroom.Data, account.ID, bedroom.Script).Scan(&bedroom.ID) if err != nil { return } stmt = "INSERT INTO permissions (object) VALUES ( $1 )" _, err = tx.Exec(ctx, stmt, bedroom.ID) if err != nil { return } return tx.Commit(ctx) } func (db *pgDB) ValidateCredentials(name, password string) (*Account, error) { a, err := db.GetAccount(name) if err != nil { return nil, err } if a.Pwhash == "" { return nil, errors.New("this account cannot be logged into") } // TODO hashing lol if a.Pwhash != password { return nil, errors.New("invalid credentials") } return a, nil } func (db *pgDB) GetAccount(name string) (a *Account, err error) { a = &Account{} stmt := "SELECT id, name, pwhash FROM accounts WHERE name = $1" err = db.pool.QueryRow(context.Background(), stmt, name).Scan(&a.ID, &a.Name, &a.Pwhash) return } func (db *pgDB) StartSession(a Account) (sid string, err error) { sid = uuid.New().String() _, err = db.pool.Exec(context.Background(), "INSERT INTO sessions (id, account) VALUES ( $1, $2 )", sid, a.ID) if err != nil { return } // Clean up any ghosts to prevent avatar duplication // TODO subquery stmt := "DELETE FROM contains WHERE contained = (SELECT id FROM objects WHERE objects.avatar = true and objects.owner = $1)" _, err = db.pool.Exec(context.Background(), stmt, a.ID) if err != nil { log.Printf("failed to clean up ghosts for %d: %s", a.ID, err.Error()) err = nil } return } func (db *pgDB) EndSession(sid string) (err error) { if sid == "" { log.Println("db.EndSession called with empty session id") return } var o *Object if o, err = db.AvatarBySessionID(sid); err == nil { if _, err = db.pool.Exec(context.Background(), "DELETE FROM contains WHERE contained = $1", o.ID); err != nil { log.Printf("failed to remove avatar from room: %s", err.Error()) } } else { log.Printf("failed to find avatar for session %s: %s", sid, err.Error()) } _, err = db.pool.Exec(context.Background(), "DELETE FROM sessions WHERE id = $1", sid) return } func (db *pgDB) SessionIDForAvatar(obj Object) (string, error) { if !obj.Avatar { return "", nil } fmt.Printf("%#v", obj) ctx := context.Background() stmt := `SELECT id FROM sessions WHERE account = $1` var sid *string err := db.pool.QueryRow(ctx, stmt, obj.OwnerID).Scan(&sid) if err != nil { return "", err } if sid == nil { return "", nil } return *sid, nil } func (db *pgDB) AvatarBySessionID(sid string) (avatar *Object, err error) { avatar = &Object{} // TODO subquery stmt := ` SELECT id, avatar, data, owner, script FROM objects WHERE avatar = true AND owner = ( SELECT a.id FROM sessions s JOIN accounts a ON s.account = a.id WHERE s.id = $1)` err = db.pool.QueryRow(context.Background(), stmt, sid).Scan( &avatar.ID, &avatar.Avatar, &avatar.Data, &avatar.OwnerID, &avatar.Script) return } func (db *pgDB) BedroomBySessionID(sid string) (bedroom *Object, err error) { bedroom = &Object{} // TODO subquery stmt := ` SELECT id, bedroom, data FROM objects WHERE bedroom = true AND owner = ( SELECT a.id FROM sessions s JOIN accounts a ON s.account = a.id WHERE s.id = $1)` err = db.pool.QueryRow(context.Background(), stmt, sid).Scan( &bedroom.ID, &bedroom.Bedroom, &bedroom.Data) return } func (db *pgDB) MoveInto(toMove Object, container Object) error { ctx := context.Background() tx, err := db.pool.Begin(ctx) if err != nil { return err } defer tx.Rollback(ctx) stmt := "DELETE FROM contains WHERE contained = $1" _, err = tx.Exec(ctx, stmt, toMove.ID) if err != nil { return err } stmt = "INSERT INTO contains (contained, container) VALUES ($1, $2)" _, err = tx.Exec(ctx, stmt, toMove.ID, container.ID) if err != nil { return err } return tx.Commit(ctx) } func (db *pgDB) Earshot(obj Object) ([]Object, error) { stmt := ` SELECT id, avatar, bedroom, data, owner, script FROM objects WHERE id IN ( SELECT contained FROM contains WHERE container = ( SELECT container FROM contains WHERE contained = $1 LIMIT 1))` rows, err := db.pool.Query(context.Background(), stmt, obj.ID) if err != nil { return nil, err } out := []Object{} for rows.Next() { heard := Object{} if err = rows.Scan( &heard.ID, &heard.Avatar, &heard.Bedroom, &heard.Data, &heard.OwnerID, &heard.Script); err != nil { return nil, err } out = append(out, heard) } return out, nil } func (db *pgDB) GetObjectByID(ID int) (*Object, error) { ctx := context.Background() obj := &Object{} stmt := ` SELECT id, avatar, data, owner, script FROM objects WHERE id = $1` err := db.pool.QueryRow(ctx, stmt, ID).Scan( &obj.ID, &obj.Avatar, &obj.Data, &obj.OwnerID, &obj.Script) return obj, err } // TODO fix arg func (db *pgDB) GetObject(owner, name string) (obj *Object, err error) { ctx := context.Background() obj = &Object{} stmt := ` SELECT id, avatar, data, owner, script FROM objects WHERE owner = (SELECT id FROM accounts WHERE name=$1) AND data['name'] = $2` err = db.pool.QueryRow(ctx, stmt, owner, fmt.Sprintf(`"%s"`, name)).Scan( &obj.ID, &obj.Avatar, &obj.Data, &obj.OwnerID, &obj.Script) return } func (db *pgDB) GetAccountAvatar(account Account) (*Object, error) { ctx := context.Background() obj := &Object{ OwnerID: account.ID, Avatar: true, } stmt := ` SELECT id, data, script FROM objects WHERE owner = $1 AND avatar IS true` err := db.pool.QueryRow(ctx, stmt, account.ID).Scan( &obj.ID, &obj.Data, &obj.Script) if err != nil { return nil, err } return obj, nil } func (db *pgDB) ActiveSessions() (out []Session, err error) { stmt := `SELECT id, account FROM sessions` rows, err := db.pool.Query(context.Background(), stmt) if err != nil { return } for rows.Next() { s := Session{} if err = rows.Scan(&s.ID, &s.AccountID); err != nil { return } out = append(out, s) } return } func (db *pgDB) ClearSessions() (err error) { _, err = db.pool.Exec(context.Background(), "DELETE FROM sessions") return } func hasInvocation(obj *Object) string { hi := "has({\n" for k, v := range obj.Data { hi += fmt.Sprintf(`%s = "%s",`, k, v) + "\n" } hi += "})" return hi } func (db *pgDB) CreateObject(owner *Account, obj *Object) error { ctx := context.Background() stmt := ` INSERT INTO objects (avatar, bedroom, data, script, owner) VALUES ( $1, $2, $3, $4, $5) RETURNING id ` obj.Script = hasInvocation(obj) err := db.pool.QueryRow(ctx, stmt, obj.Avatar, obj.Bedroom, obj.Data, obj.Script, owner.ID).Scan( &obj.ID) if err != nil { return err } return nil } func randSmell() string { // TODO seeding smells := []string{ "lavender", "wet soil", "juniper", "pine sap", "wood smoke", } ix := rand.Intn(len(smells)) return smells[ix] }