NGnius
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lion-turtle
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Create leadercraft rank updater

master
NGnius (Graham) 3 年之前
父節點
a1ea870c7c
當前提交
360cc0ad0e
共有 7 個檔案被更改，包括 708 行新增 和 0 行删除
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  1. +8
    -0
      leadercraft-ranker/go.mod
  2. +4
    -0
      leadercraft-ranker/go.sum
  3. 二進制
      leadercraft-ranker/leadercraft-ranker
  4. 二進制
      leadercraft-ranker/leadercraft-s
  5. +108
    -0
      leadercraft-ranker/main.go
  6. +270
    -0
      leadercraft-ranker/sql_service.go
  7. +318
    -0
      leadercraft-ranker/sql_structs.go

+ 8
- 0
leadercraft-ranker/go.mod 查看文件

@@ -0,0 +1,8 @@
module git.exmods.org/NGnius/lion-turtle/leadercraft-ranker

go 1.13

require (
github.com/lib/pq v1.3.0
github.com/mattn/go-sqlite3 v2.0.3+incompatible
)

+ 4
- 0
leadercraft-ranker/go.sum 查看文件

@@ -0,0 +1,4 @@
github.com/lib/pq v1.3.0 h1:/qkRGz8zljWiDcFvgpwUpwIAPu3r07TDvs3Rws+o/pU=
github.com/lib/pq v1.3.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
github.com/mattn/go-sqlite3 v2.0.3+incompatible h1:gXHsfypPkaMZrKbD5209QV9jbUTJKjyR5WD3HYQSd+U=
github.com/mattn/go-sqlite3 v2.0.3+incompatible/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsOqkbpncsNc=

二進制
leadercraft-ranker/leadercraft-ranker 查看文件


二進制
leadercraft-ranker/leadercraft-s 查看文件


+ 108
- 0
leadercraft-ranker/main.go 查看文件

@@ -0,0 +1,108 @@
// NGnius 2020-01-30

package main // leadercraft-server

import (
"flag"
"fmt"
"os"
"os/signal"
)

const (
// Version the current version
Version = "0.1"
// Name the program name
Name = "leadercraft-s"
)

var (
isClosing bool
printVersionAndExit bool
)

func init() {
initArgs()
}

func main() {
parseArgs()
sqlInitErr := sqlInit()
if sqlInitErr != nil {
fmt.Printf("Failed to initialise SQL connection: %s\n", sqlInitErr)
os.Exit(1)
}
// handle interrupt (terminate) signal
signalChan := make(chan os.Signal)
signal.Notify(signalChan, os.Interrupt)
go func() {
s := <-signalChan
fmt.Println("Received terminate signal " + s.String())
isClosing = true
sqlClose()
}()
// get new rankings
rows, err := db.Query("SELECT * FROM Entries WHERE rank=-1 ORDER BY time ASC;")
if err == nil {
var entries []*Entry
count := 0
for rows.Next() {
entries = append(entries, &Entry{})
scanErr := rows.Scan(entries[count].Intake()...)
if scanErr == nil {
updateBoardEntries(entries[count])
count++
} else {
fmt.Println(scanErr)
}
}
} else {
fmt.Println(err)
}
}

func initArgs() {
flag.BoolVar(&printVersionAndExit, "version", false, "Print version and exit")
flag.StringVar(&sqlConnection, "conn", sqlConnectionDefault, "Database connection string")
flag.StringVar(&sqlServer, "sql", sqlServerDefault, "SQL Database type")
}

func parseArgs() {
flag.Parse()
if printVersionAndExit {
fmt.Println(Name + " v" + Version)
os.Exit(0)
}
}

func updateBoardEntries(entry *Entry) {
// get nearest entry that's lower and steal it's rank
nearestEntry := &Entry{}
scanErr := db.QueryRow("SELECT * FROM Entries WHERE score < $1 AND rank!= -1 AND board=$2 ORDER BY score DESC LIMIT 1;", entry.Score, entry.Board).Scan(nearestEntry.Intake()...)
if (scanErr == nil) {
entry.Rank = nearestEntry.Rank
entry.Commit()
// update all ranks lower than itself
tx, _ := db.Begin()
stmt, _ := tx.Prepare("UPDATE Entries SET rank=rank+1 WHERE rank >=$1 AND id!=$2 AND board=$3;")
_, err := stmt.Exec(entry.Rank, entry.ID, entry.Board)
if err != nil {
tx.Rollback()
fmt.Println(err)
} else {
tx.Commit()
}
} else {
// nothing to beat
scanErr = db.QueryRow("SELECT * FROM Entries WHERE score >= $1 AND rank!= -1 AND board=$2 ORDER BY score ASC LIMIT 1;", entry.Score, entry.Board).Scan(nearestEntry.Intake()...)
if (scanErr == nil) {
entry.Rank = nearestEntry.Rank + 1
entry.Commit()
} else {
// no other entries
entry.Rank = 1
entry.Commit()
//fmt.Println(scanErr)
}
}
}

+ 270
- 0
leadercraft-ranker/sql_service.go 查看文件

@@ -0,0 +1,270 @@
// NGnius 2020-02-11

package main

import (
"database/sql"
"fmt"
"time"

_ "github.com/lib/pq" // postgres
_ "github.com/mattn/go-sqlite3" // sqlite
)

const (
sqlServerDefault = "sqlite3"
sqlConnectionDefault = "test.sqlite"
)

var (
// command line arguments
sqlServer string
sqlConnection string
buildTables bool
populateTables bool
autocreate bool
// internal variables
db *sql.DB
queryType int
queryStrings [][]string
)

func sqlInit() error {
var dbOpenErr error
if sqlServer == "postgres" {
queryType = 1
} else { // sqlite3
queryType = 0
}
queryStrings = [][]string{
[]string{ // sqlite
"SELECT * FROM Boards WHERE name=? LIMIT 1;",
"SELECT * FROM Players WHERE name=? LIMTI 1;",
"INSERT INTO Entries(score, player, board, time) VALUES (?, ?, ?, ?);",
"INSERT INTO Keys(token, player, time) VALUES (?, ?, ?);",
"SELECT * FROM Keys WHERE token=? AND player=? AND time=?",
"SELECT * FROM Keys WHERE token=? LIMIT 1;",
"SELECT * FROM Keys WHERE player=? LIMIT 1;",
"SELECT * FROM Boards WHERE id=?",
"INSERT OR REPLACE INTO Boards(id, name, description) VALUES (?, ?, ?);",
"SELECT * FROM Entries WHERE board=?",
"SELECT * FROM Entries WHERE board=? and rank >= ? and rank <= ? ORDER BY rank ASC;",
"SELECT * FROM Players WHERE id=? LIMIT 1;",
"INSERT OR REPLACE INTO Players(id, name) VALUES (?, ?);",
"SELECT * FROM Entries WHERE player=?",
"SELECT * FROM Entries WHERE player=? ORDER BY time DESC LIMIT ?;",
"SELECT * FROM Entries WHERE id=? LIMIT 1;",
"INSERT OR REPLACE INTO Entries(id, rank, score, player, board, time, metadata) VALUES (?, ?, ?, ?, ?, ?, ?);",
"SELECT * FROM Keys WHERE id=? LIMIT 1;",
"INSERT OR REPLACE INTO Keys(id, token, player, time, metadata) VALUES (?, ?, ?, ?, ?);",
"CREATE TABLE IF NOT EXISTS Players (id INTEGER PRIMARY KEY, name TEXT NOT NULL);",
"CREATE TABLE IF NOT EXISTS Boards (id INTEGER PRIMARY KEY, name TEXT NOT NULL, description TEXT NOT NULL);",
"CREATE TABLE IF NOT EXISTS Entries (id INTEGER PRIMARY KEY, rank INTEGER NOT NULL DEFAULT -1, score INTEGER NOT NULL, player INTEGER NOT NULL, board INTEGER NOT NULL, time INTEGER NOT NULL, metadata BLOB NOT NULL DEFAULT x'FF', FOREIGN KEY(player) REFERENCES Players(id), FOREIGN KEY(board) REFERENCES Boards(id));",
"CREATE TABLE IF NOT EXISTS Keys (id INTEGER PRIMARY KEY, token TEXT NOT NULL, player INTEGER NOT NULL, time INTEGER NOT NULL, metadata BLOB NOT NULL DEFAULT x'FF', FOREIGN KEY(player) REFERENCES Players(id));",
},
[]string{ // postgres
"SELECT * FROM Boards WHERE name=$1 LIMIT 1;",
"SELECT * FROM Players WHERE name=$1 LIMTI 1;",
"INSERT INTO Entries(score, player, board, time) VALUES ($1, $2, $3, $4);",
"INSERT INTO Keys(token, player, time) VALUES ($1, $2, $3);",
"SELECT * FROM Keys WHERE token=$1 AND player=$2 AND time=$3",
"SELECT * FROM Keys WHERE token=$1 LIMIT 1;",
"SELECT * FROM Keys WHERE player=$1 LIMIT 1;",
"SELECT * FROM Boards WHERE id=$1",
"INSERT INTO Boards(id, name, description) VALUES ($1, $2, $3) ON CONFLICT(id) DO UPDATE SET name=$2, description=$3;",
"SELECT * FROM Entries WHERE board=$1",
"SELECT * FROM Entries WHERE board=$1 and rank >= $2 and rank <= $3 ORDER BY rank ASC;",
"SELECT * FROM Players WHERE id=$1 LIMIT 1;",
"INSERT INTO Players(id, name) VALUES ($1, $2) ON CONFLICT(id) DO UPDATE SET name=$2;",
"SELECT * FROM Entries WHERE player=$1;",
"SELECT * FROM Entries WHERE player=$1 ORDER BY time DESC LIMIT $2;",
"SELECT * FROM Entries WHERE id=$1 LIMIT 1;",
"INSERT INTO Entries(id, rank, score, player, board, time, metadata) VALUES ($1, $2, $3, $4, $5, $6, $7) ON CONFLICT(id) DO UPDATE SET rank=$2, score=$3, player=$4, board=$5, time=$6, metadata=$7;",
"SELECT * FROM Keys WHERE id=$1 LIMIT 1;",
"INSERT INTO Keys(id, token, player, time, metadata) VALUES ($1, $2, $3, $4, $5) ON CONFLICT(id) DO UPDATE SET token=$2, player=$3, time=$4, metadata=$5;",
"CREATE TABLE IF NOT EXISTS Players (id BIGSERIAL PRIMARY KEY, name TEXT NOT NULL);",
"CREATE TABLE IF NOT EXISTS Boards (id BIGSERIAL PRIMARY KEY, name TEXT NOT NULL, description TEXT NOT NULL);",
"CREATE TABLE IF NOT EXISTS Entries (id BIGSERIAL PRIMARY KEY, rank INTEGER NOT NULL DEFAULT -1, score BIGINT NOT NULL, player BIGSERIAL NOT NULL, board BIGSERIAL NOT NULL, time INTEGER NOT NULL, metadata BYTEA NOT NULL DEFAULT E'\\\\xFF', FOREIGN KEY(player) REFERENCES Players(id), FOREIGN KEY(board) REFERENCES Boards(id));",
"CREATE TABLE IF NOT EXISTS Keys (id BIGSERIAL PRIMARY KEY, token TEXT NOT NULL, player BIGSERIAL NOT NULL, time BIGSERIAL NOT NULL, metadata BYTEA NOT NULL DEFAULT E'\\\\xFF', FOREIGN KEY(player) REFERENCES Players(id));",
},
}
fmt.Printf("SQL Server %s is query type %d\n", sqlServer, queryType)
//fmt.Println(len(queryStrings[queryType]))
db, dbOpenErr = sql.Open(sqlServer, sqlConnection)
if dbOpenErr != nil {
return dbOpenErr
}
if buildTables {
fmt.Println("Building tables in database...")
sqlBuildTables()
}
if populateTables {
fmt.Println("Populating tables in database...")
sqlPopulateTables()
}
return nil
}

func sqlClose() error {
if db != nil {
err := db.Close()
if err != nil {
return err
}
db = nil
}
return nil
}

func boardByName(name string) (*Board, error) {
b := &Board{}
return b, db.QueryRow(queryStrings[queryType][0], name).Scan(b.Intake()...)
}

func playerByName(name string) (*Player, error) {
p := &Player{}
return p, db.QueryRow(queryStrings[queryType][1], name).Scan(p.Intake()...)
}

func newEntrySql(score, player, board int64) error {
tx, _ := db.Begin()
stmt, _ := tx.Prepare(queryStrings[queryType][2])
_, err := stmt.Exec(score, player, board, time.Now().Unix())
if err != nil {
tx.Rollback()
return err
}
tx.Commit()
return nil
}

func newKeySql(player int64, name string) (*Key, error) {
tx, _ := db.Begin()
if autocreate {
sqlPlayer := &Player{ID: player, Name: name}
if (sqlPlayer.Load() != nil) {
playerErr := sqlPlayer.Commit()
if playerErr != nil {
return nil, playerErr
}
}
}
newKey := &Key{Token: "new", Player: player, Time: time.Now().Unix()}
stmt, _ := tx.Prepare(queryStrings[queryType][3])
_, err := stmt.Exec(newKey.Token, newKey.Player, newKey.Time)
if err != nil {
tx.Rollback()
return nil, err
}
tx.Commit()
db.QueryRow(queryStrings[queryType][4], newKey.Token, newKey.Player, newKey.Time).Scan(newKey.Intake()...)
tokenErr := newKey.GenerateToken()
if tokenErr != nil {
return nil, tokenErr
}
newKey.Metadata = []byte{0xFE} // enable key with not extra permissions
return newKey, newKey.Commit()
}

func keyByToken(token string) (*Key, error) {
k := &Key{}
return k, db.QueryRow(queryStrings[queryType][5], token).Scan(k.Intake()...)
}

func keyByPlayer(player int64) (*Key, error) {
k := &Key{}
return k, db.QueryRow(queryStrings[queryType][6], player).Scan(k.Intake()...)
}

// internal operations
func sqlBuildTables() {
transaction, txErr := db.Begin()
if txErr != nil {
return
}
// test table
//transaction.Exec("CREATE TABLE IF NOT EXISTS Test (Sometext VARCHAR, Somenumber);")
//transaction.Exec("INSERT INTO Test (Sometext, Somenumber) VALUES (?,?);", "Hello sqlite", 123)
// build real tables
transaction.Exec(queryStrings[queryType][19])
transaction.Exec(queryStrings[queryType][20])
transaction.Exec(queryStrings[queryType][21])
transaction.Exec(queryStrings[queryType][22])
transaction.Commit()
}

func sqlPopulateTables() {
boards := []*Board{
&Board{ID: 1, Name: "main-test", Description: "Overall best (test data)"},
&Board{ID: 2, Name: "coolest-test", Description: "Coolest score (test data)"},
&Board{ID: 3, Name: "fastest-test", Description: "Fastest time (test data)"},
}
for _, b := range boards {
err := b.Commit()
if err != nil {
fmt.Printf("Error creating board %d: %s\n", b.ID, err)
}
}
players := []*Player{
&Player{ID: 1, Name: "NGnius (test)"},
&Player{ID: 2, Name: "Also NGnius (test)"},
&Player{ID: 3, Name: ".xX||eDgY TeeNaGeR||Xx. (test)"},
&Player{ID: 4, Name: "New username who dis? (test)"},
&Player{ID: 5, Name: "Extremely Ridiculously Long Name to break things (test)"},
&Player{ID: 6, Name: "P|P3 |o|z (test)"},
&Player{ID: 7, Name: "Waldo (test)"},
&Player{ID: 8, Name: "Zettagram.com (test)"},
&Player{ID: 9, Name: "The Doctor (test)"},
&Player{ID: 10, Name: "Marvin the Paranoid Android (test)"},
&Player{ID: 11, Name: "IDK HOW (test)"},
&Player{ID: 12, Name: "If you can read this your API may be wrong (test)"},
&Player{ID: 13, Name: "Unlucky 7 (test)"},
}
for _, p := range players {
err := p.Commit()
if err != nil {
fmt.Printf("Error creating player %d: %s\n", p.ID, err)
}
}
now := time.Now().Unix()
metadata := []byte{0x00, 0x00, 0x00, 0x00}
entries := []*Entry{
&Entry{ID: 1, Rank: 1, Score: 1000, Player: players[0].ID, Board: boards[0].ID, Time: now, Metadata: metadata},
&Entry{ID: 2, Rank: 2, Score: 900, Player: players[1].ID, Board: boards[0].ID, Time: now, Metadata: metadata},
&Entry{ID: 3, Rank: 3, Score: 400, Player: players[2].ID, Board: boards[0].ID, Time: now, Metadata: metadata},
&Entry{ID: 4, Rank: 4, Score: 350, Player: players[3].ID, Board: boards[0].ID, Time: now, Metadata: metadata},
&Entry{ID: 5, Rank: 5, Score: 350, Player: players[4].ID, Board: boards[0].ID, Time: now, Metadata: metadata},
&Entry{ID: 6, Rank: 6, Score: 250, Player: players[5].ID, Board: boards[0].ID, Time: now, Metadata: metadata},
&Entry{ID: 7, Rank: 7, Score: 200, Player: players[6].ID, Board: boards[0].ID, Time: now, Metadata: metadata},
&Entry{ID: 8, Rank: 8, Score: 175, Player: players[7].ID, Board: boards[0].ID, Time: now, Metadata: metadata},
&Entry{ID: 9, Rank: 9, Score: 150, Player: players[8].ID, Board: boards[0].ID, Time: now, Metadata: metadata},
&Entry{ID: 10, Rank: 10, Score: 140, Player: players[9].ID, Board: boards[0].ID, Time: now, Metadata: metadata},
&Entry{ID: 11, Rank: 11, Score: 10, Player: players[10].ID, Board: boards[0].ID, Time: now, Metadata: metadata},
&Entry{ID: 12, Rank: 12, Score: 60, Player: players[11].ID, Board: boards[0].ID, Time: now, Metadata: metadata},
&Entry{ID: 13, Rank: 13, Score: 13, Player: players[12].ID, Board: boards[0].ID, Time: now},
}
for _, e := range entries {
err := e.Commit()
if err != nil {
fmt.Printf("Error creating entry %d: %s\n", e.ID, err)
}
}
metadata = []byte{0x7E}
keys := []*Key{
&Key{ID: 1, Token: "", Player: players[0].ID, Time: now, Metadata: metadata},
&Key{ID: 2, Token: "", Player: players[1].ID, Time: now, Metadata: metadata},
}
for _, k := range keys {
genErr := k.GenerateToken()
if genErr != nil {
fmt.Printf("Error generating token for key %d, %s\n", k.ID, genErr)
}
//fmt.Printf("Key %d token: %s\n", k.ID, k.Token)
err := k.Commit()
if err != nil {
fmt.Printf("Error creating key %d, %s\n", k.ID, err)
}
// bitwise op test
//fmt.Printf("Key &d is superuser:%t, enabled:%t\n", k.ID, k.IsSuperuser(), k.IsEnabled())
}
}

+ 318
- 0
leadercraft-ranker/sql_structs.go 查看文件

@@ -0,0 +1,318 @@
// NGnius 2020-02-12

package main

import (
"crypto/rand"
"crypto/sha512"
"encoding/binary"
"math/big"
"strconv"
// test
//"fmt"
)

var (
randomizeTokens bool
)

type Rower interface {
Intake() []interface{}
Output() []interface{}
}

type Board struct {
ID int64
Name string
Description string
}

func LoadBoard(id int64) *Board {
b := &Board{ID: id}
loadErr := b.Load()
if loadErr != nil {
return nil
}
return b
}

func (b *Board) Load() error {
return db.QueryRow(queryStrings[queryType][7], b.ID).Scan(b.Intake()...)
}

func (b *Board) Commit() error {
tx, _ := db.Begin()
statement, _ := tx.Prepare(queryStrings[queryType][8])
_, err := statement.Exec(b.Output()...)
if err != nil {
tx.Rollback()
return err
}
return tx.Commit()
}

func (b *Board) Entries() ([]*Entry, error) {
var entries []*Entry
rows, err := db.Query(queryStrings[queryType][9], b.ID)
if err != nil {
return entries, err
}
count := 0
for rows.Next() {
entries = append(entries, &Entry{})
scanErr := rows.Scan(entries[count].Intake()...)
if scanErr != nil {
return entries, scanErr
}
count++
}
return entries, nil
}

func (b *Board) SomeEntries(start, end int64) ([]*Entry, error) {
var entries []*Entry
rows, err := db.Query(queryStrings[queryType][10], b.ID, start, end)
if err != nil {
return entries, err
}
count := 0
for rows.Next() {
entries = append(entries, &Entry{})
scanErr := rows.Scan(entries[count].Intake()...)
if scanErr != nil {
return entries, scanErr
}
count++
}
return entries, nil
}

func (b *Board) Url() string {
return "/board?name=" + b.Name
}

// implementation of Rower
func (b *Board) Intake() []interface{} {
return []interface{}{&b.ID, &b.Name, &b.Description}
}

func (b *Board) Output() []interface{} {
return []interface{}{b.ID, b.Name, b.Description}
}

type Player struct {
ID int64
Name string
}

func LoadPlayer(id int64) *Player {
p := &Player{ID: id}
loadErr := p.Load()
if loadErr != nil {
return nil
}
return p
}

func (p *Player) Load() error {
return db.QueryRow(queryStrings[queryType][11], p.ID).Scan(p.Intake()...)
}

func (p *Player) Commit() error {
tx, _ := db.Begin()
statement, _ := tx.Prepare(queryStrings[queryType][12])
_, err := statement.Exec(p.Output()...)
if err != nil {
tx.Rollback()
return err
}
return tx.Commit()
}

func (p *Player) Entries() ([]*Entry, error) {
var entries []*Entry
rows, err := db.Query(queryStrings[queryType][13], p.ID)
if err != nil {
return entries, err
}
count := 0
for rows.Next() {
entries = append(entries, &Entry{})
scanErr := rows.Scan(entries[count].Intake()...)
if scanErr != nil {
return entries, scanErr
}
count++
}
return entries, nil
}

func (p *Player) SomeEntries(limit int64) ([]*Entry, error) {
var entries []*Entry
rows, err := db.Query(queryStrings[queryType][14], p.ID, limit)
if err != nil {
return entries, err
}
count := 0
for rows.Next() {
entries = append(entries, &Entry{})
scanErr := rows.Scan(entries[count].Intake()...)
if scanErr != nil {
return entries, scanErr
}
count++
}
return entries, nil
}

func (p *Player) Url() string {
return "/player?id=" + strconv.Itoa(int(p.ID))
}

// implementation of Rower
func (p *Player) Intake() []interface{} {
return []interface{}{&p.ID, &p.Name}
}

func (p *Player) Output() []interface{} {
return []interface{}{p.ID, p.Name}
}

type Entry struct {
ID int64
Rank int64
Score int64
Player int64
Board int64
Time int64 // Created time (seconds since Unix epoch)
Metadata []byte
}

func LoadEntry(id int64) *Entry {
e := &Entry{ID: id}
loadErr := e.Load()
if loadErr != nil {
return nil
}
return e
}

func (e *Entry) Load() error {
return db.QueryRow(queryStrings[queryType][15], e.ID).Scan(e.Intake()...)
}

func (e *Entry) Commit() error {
tx, _ := db.Begin()
statement, _ := tx.Prepare(queryStrings[queryType][16])
_, err := statement.Exec(e.Output()...)
if err != nil {
tx.Rollback()
return err
}
return tx.Commit()
}

// implementation of Rower
func (e *Entry) Intake() []interface{} {
return []interface{}{&e.ID, &e.Rank, &e.Score, &e.Player, &e.Board, &e.Time, &e.Metadata}
}

func (e *Entry) Output() []interface{} {
return []interface{}{e.ID, e.Rank, e.Score, e.Player, e.Board, e.Time, e.Metadata}
}

type Key struct {
ID int64
Token string
Player int64
Time int64 // Created time (seconds since Unix epoch)
Metadata []byte
}

func LoadKey(id int64) *Key {
k := &Key{ID: id}
loadErr := k.Load()
if loadErr != nil {
return nil
}
return k
}

func (k *Key) Load() error {
return db.QueryRow(queryStrings[queryType][17], k.ID).Scan(k.Intake()...)
}

func (k *Key) Commit() error {
tx, _ := db.Begin()
statement, _ := tx.Prepare(queryStrings[queryType][18])
_, err := statement.Exec(k.Output()...)
if err != nil {
tx.Rollback()
return err
}
return tx.Commit()
}

func (k *Key) IsEnabled() bool {
return (k.Metadata[0] & 0b00000001) == 0
}

func (k *Key) Disable() {
k.Metadata[0] = k.Metadata[0] | 0b00000001
}

func (k *Key) IsSuperuser() bool {
return (k.Metadata[0] & 0b00000100) == 0
}

func (k *Key) Promote() {
k.Metadata[0] = k.Metadata[0] | 0b00000100
}

func (k *Key) IsMultiuser() bool {
return (k.Metadata[0] & 0b00010000) == 0
}

func (k *Key) Develop() {
k.Metadata[0] = k.Metadata[0] | 0b00010000
}

func (k *Key) GenerateToken() error {
buf_int64 := make([]byte, 10) // 8 bytes = 64 bits
input := []byte{}
if randomizeTokens {
max := big.NewInt(2 ^ 16 - 1)
for i := 0; i < 512; i++ {
// generate randomness
num, _ := rand.Int(rand.Reader, max)
input = append(input, num.Bytes()...)
}
}
binary.PutVarint(buf_int64, k.ID)
input = append(input, buf_int64[0:8]...)
binary.PutVarint(buf_int64, k.Player)
input = append(input, buf_int64[0:8]...)
binary.PutVarint(buf_int64, k.Time)
input = append(input, buf_int64[0:8]...)
bToken := sha512.Sum512(input)
//k.Token = string(bToken)
k.Token = ""
for _, b := range bToken {
tmp_b := b & 0b01111111 // Valid 7-bit ASCII values only
for !((tmp_b > 47 && tmp_b < 58) || (tmp_b > 64 && tmp_b < 91) || (tmp_b > 96 && tmp_b < 123)) {
tmp_b = sha512.Sum512([]byte{tmp_b})[1]
tmp_b = tmp_b & 0b01111111
}
k.Token += string(tmp_b)
}
return nil
}

// Implementation of Rower
func (k *Key) Intake() []interface{} {
return []interface{}{&k.ID, &k.Token, &k.Player, &k.Time, &k.Metadata}
}

func (k *Key) Output() []interface{} {
return []interface{}{k.ID, k.Token, k.Player, k.Time, k.Metadata}
}