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