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world.go
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world.go
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package main
import (
"database/sql"
"fmt"
)
// Zone : struct
type Zone struct {
ID int
Name string
Rooms []*Room
}
// Room struct
type Room struct {
ID int
Zone *Zone
Name string
Description string
Exits [6]Exit
}
// Exit struct
type Exit struct {
To *Room
Description string
}
// Direction : string to int
var Direction = map[string]int{
"n": 0,
"e": 1,
"w": 2,
"s": 3,
"u": 4,
"d": 5,
}
// ReDirection : numebr string
var ReDirection = map[int]string{
0: "n",
1: "e",
2: "w",
3: "s",
4: "u",
5: "d",
}
// OutputEvent struct
type OutputEvent struct {
Mag string
}
// ALLROOM all the room
var ALLROOM = make(map[int]*Room)
// Part 2:
func loadzone(transaction *sql.Tx) (map[int]*Zone, error) {
var id int
//var zone_id int
var name string
//var description string
var allzone = make(map[int]*Zone)
rows, err := transaction.Query(`SELECT id, name FROM zones ORDER BY id`)
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
if err := rows.Scan(&id, &name); err != nil {
return nil, err
}
newZone := Zone{id, name, nil}
newPointer := &newZone
allzone[id] = newPointer
}
return allzone, nil
}
func loadroom(Zone map[int]*Zone, transaction *sql.Tx) (map[int]*Room, error) {
var roomID int
var roomName string
var roomDescription string
var allroom = make(map[int]*Room)
var zoneID int
rows, err := transaction.Query(`SELECT id, zone_id, name, description FROM rooms`)
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
if err := rows.Scan(&roomID, &zoneID, &roomName, &roomDescription); err != nil {
return nil, err
}
zonePointer := Zone[zoneID]
newRoom := Room{roomID, zonePointer, roomName, roomDescription, [6]Exit{}}
allroom[roomID] = &newRoom
Zone[zoneID].Rooms = []*Room{&newRoom}
}
return allroom, nil
}
func loadExit(Room map[int]*Room, transaction *sql.Tx) (map[int]*Room, error) {
var fromRoom int
var toRoom int
var direction string
var description string
rows, err := transaction.Query(`SELECT * FROM exits`)
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
if err := rows.Scan(&fromRoom, &toRoom, &direction, &description); err != nil {
return nil, err
}
toPointer := Room[toRoom]
newExit := Exit{toPointer, description}
Room[fromRoom].Exits[Direction[direction]] = newExit
}
return Room, nil
}
func loadalldata(tx *sql.Tx) error {
ALLzone, err := loadzone(tx)
if err != nil {
return err
}
ALLroom, err := loadroom(ALLzone, tx)
ALLROOM, err = loadExit(ALLroom, tx)
if err != nil {
return err
}
//for key, value := range ALLROOM {
// fmt.Printf("ROOM: ", key, "pointer: ", value)
// fmt.Printf("\n")
//}
return nil
}
func opentransaction(database *sql.DB) error {
tx, err := database.Begin()
if err != nil {
return fmt.Errorf("Starting Transaction: %v", err)
}
err = loadalldata(tx)
if err != nil {
tx.Rollback()
return fmt.Errorf("Loading world data: %v", err)
}
if err := tx.Commit(); err != nil {
return fmt.Errorf("Transaction failed while loading world data : %v", err)
}
return nil
}
// SetupWorld setup
func SetupWorld() error {
// Part 2:
// the path to the database--this could be an absolute path
//path := "world.db"
path := "/Users/Aaron/Desktop/CS 3410/MUD/world.db"
options :=
"?" + "_busy_timeout=10000" +
"&" + "_foreign_keys=ON" +
"&" + "_journal_mode=WAL" +
"&" + "mode=rw" +
"&" + "_synchronous=NORMAL"
db, err := sql.Open("sqlite3", path+options)
if err != nil {
// handle the error here
return err
}
defer db.Close()
err = opentransaction(db)
if err != nil {
return err
}
return nil
}