initial commit

internal/beerpong-elo.go

@@ -0,0 +1,71 @@
+package beerpongelo
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+	"os"
+
+	"git.kapelle.org/niklas/beerpong-elo/internal/model"
+	"git.kapelle.org/niklas/beerpong-elo/internal/repo"
+	"git.kapelle.org/niklas/beerpong-elo/internal/web"
+)
+
+type Config struct {
+	DBHost     string
+	DBUsername string
+	DBPassword string
+	DBName     string
+	Address    string
+}
+
+func Start(config Config) {
+	repo, err := repo.NewSQLRepo(config.DBHost, config.DBUsername, config.DBPassword, config.DBName)
+
+	if err != nil {
+		log.Fatalf("Failed to start server: %s", err)
+	}
+
+	mux := web.CreateWebserver(repo)
+
+	http.ListenAndServe(config.Address, mux)
+}
+
+func Import(config Config, file string) {
+	repo, err := repo.NewSQLRepo(config.DBHost, config.DBUsername, config.DBPassword, config.DBName)
+
+	if err != nil {
+		log.Fatalf("Failed to import file %s: %s", file, err)
+	}
+
+	controller := newController(repo)
+	err = loadFromFile(controller, file)
+
+	if err != nil {
+		log.Fatalf("Failed to import file %s: %s", file, err)
+	}
+}
+
+func loadFromFile(c Controller, path string) error {
+	content, err := os.ReadFile(path)
+
+	if err != nil {
+		return err
+	}
+
+	var payload []model.Game
+	err = json.Unmarshal(content, &payload)
+	if err != nil {
+		return err
+	}
+
+	for _, game := range payload {
+		_, err = c.AddGame(game)
+		if err != nil {
+			return err
+		}
+	}
+
+	log.Printf("Imported %d games", len(payload))
+	return nil
+}

internal/controller.go

@@ -0,0 +1,142 @@
+package beerpongelo
+
+import (
+	"math"
+
+	"git.kapelle.org/niklas/beerpong-elo/internal/model"
+	"git.kapelle.org/niklas/beerpong-elo/internal/repo"
+)
+
+type Controller struct {
+	repo repo.Repo
+}
+
+func newController(repo repo.Repo) Controller {
+	return Controller{
+		repo: repo,
+	}
+}
+
+func (c *Controller) AddGame(game model.Game) (model.GameID, error) {
+	parsedGame := model.Game{
+		Added:    game.Added,
+		Score:    game.Score,
+		Overtime: game.Overtime,
+	}
+
+	author, err := c.repo.GetOrCreatePlayerID(string(game.Author))
+	if err != nil {
+		return "", err
+	}
+	parsedGame.Author = author
+
+	t0p0, err := c.repo.GetOrCreatePlayerID(string(game.Team0Player0))
+	if err != nil {
+		return "", err
+	}
+	parsedGame.Team0Player0 = t0p0
+
+	t0p1, err := c.repo.GetOrCreatePlayerID(string(game.Team0Player1))
+	if err != nil {
+		return "", err
+	}
+	parsedGame.Team0Player1 = t0p1
+
+	t1p0, err := c.repo.GetOrCreatePlayerID(string(game.Team1Player0))
+	if err != nil {
+		return "", err
+	}
+	parsedGame.Team1Player0 = t1p0
+
+	t1p1, err := c.repo.GetOrCreatePlayerID(string(game.Team1Player1))
+	if err != nil {
+		return "", err
+	}
+	parsedGame.Team1Player1 = t1p1
+
+	id, err := c.repo.AddGame(parsedGame)
+	if err != nil {
+		return "", err
+	}
+
+	parsedGame.ID = id
+
+  err = c.createGameResult(parsedGame)
+
+  if err != nil {
+    return "", err
+  }
+
+	return id, nil
+}
+
+func (c *Controller) createGameResult(game model.Game) error {
+	t0p0, err := c.repo.GetPlayer(game.Team0Player0)
+	if err != nil {
+		return err
+	}
+	t0p1, err := c.repo.GetPlayer(game.Team0Player1)
+	if err != nil {
+		return err
+	}
+	t1p0, err := c.repo.GetPlayer(game.Team1Player0)
+	if err != nil {
+		return err
+	}
+	t1p1, err := c.repo.GetPlayer(game.Team1Player1)
+	if err != nil {
+		return err
+	}
+
+	newT0p0, newT0p1, newT1p0, newT1p1 := NewRating(float64(t0p0.Elo), float64(t0p1.Elo), float64(t1p0.Elo), float64(t1p1.Elo), game.Score)
+
+	t0p0Result := model.GameResult{
+		Game:     game.ID,
+		Player:   t0p0.ID,
+		StartElo: t0p0.Elo,
+		EndElo:   int(math.Round(newT0p0)),
+	}
+
+	t0p1Result := model.GameResult{
+		Game:     game.ID,
+		Player:   t0p1.ID,
+		StartElo: t0p1.Elo,
+		EndElo:   int(math.Round(newT0p1)),
+	}
+
+	t1p0Result := model.GameResult{
+		Game:     game.ID,
+		Player:   t1p0.ID,
+		StartElo: t1p0.Elo,
+		EndElo:   int(math.Round(newT1p0)),
+	}
+
+	t1p1Result := model.GameResult{
+		Game:     game.ID,
+		Player:   t1p1.ID,
+		StartElo: t1p1.Elo,
+		EndElo:   int(math.Round(newT1p1)),
+	}
+
+  _,err = c.repo.AddGameResult(t0p0Result)
+  if err != nil{
+    return err
+  }
+  
+  _,err = c.repo.AddGameResult(t0p1Result)
+  if err != nil{
+    return err
+  }
+  
+  _,err = c.repo.AddGameResult(t1p0Result)
+  if err != nil{
+    return err
+  }
+  
+  _,err = c.repo.AddGameResult(t1p1Result)
+  if err != nil{
+    return err
+  }
+
+	return nil
+}

internal/elo.go

@@ -0,0 +1,52 @@
+package beerpongelo
+
+import (
+	"math"
+)
+
+func winProbPlayer(p, e1, e2 float64) float64 {
+	const MAGIC float64 = 500
+
+	lhs := 1 / (1 + math.Pow(10., (p-e1)/MAGIC))
+	rhs := 1 / (1 + math.Pow(10., (p-e2)/MAGIC))
+	return (lhs + rhs) / 2.
+}
+
+func NewRating(t0p0, t0p1, t1p0, t1p1 float64, score int) (float64, float64, float64, float64) {
+	const K float64 = 50
+	const SCORE_BIAS float64 = 1
+	const SCORE_SCALE float64 = 0.4
+	const MAX_SCORE float64 = 10
+
+	et0p0 := winProbPlayer(t0p0, t1p0, t1p1)
+	et0p1 := winProbPlayer(t0p1, t1p0, t1p1)
+	et1p0 := winProbPlayer(t1p0, t0p0, t0p1)
+	et1p1 := winProbPlayer(t1p1, t0p0, t0p1)
+
+	et0 := (et0p0 + et0p1) / 2.
+	et1 := (et1p0 + et1p1) / 2.
+
+	ct0p0 := t0p0 / (t0p0 + t0p1)
+	ct0p1 := t0p1 / (t0p0 + t0p1)
+	ct1p0 := t1p0 / (t1p0 + t1p1)
+	ct1p1 := t1p1 / (t1p0 + t1p1)
+
+	var st0 float64
+	var st1 float64
+	if score > 0 {
+		st0 = 1
+		st1 = 0
+	} else {
+		st0 = 0
+		st1 = 1
+	}
+
+	scoreMod := SCORE_SCALE * math.Log(math.Abs(float64(score))+SCORE_BIAS) / (math.Log(MAX_SCORE) + SCORE_BIAS)
+
+	newt0p0 := t0p0 + K*scoreMod*((st0*ct0p0)-(et0*ct0p0))
+	newt0p1 := t0p1 + K*scoreMod*((st0*ct0p1)-(et0*ct0p1))
+	newt1p0 := t1p0 + K*scoreMod*((st1*ct1p0)-(et1*ct1p0))
+	newt1p1 := t1p1 + K*scoreMod*((st1*ct1p1)-(et1*ct1p1))
+
+	return newt0p0, newt0p1, newt1p0, newt1p1
+}

internal/model/game.go

@@ -0,0 +1,33 @@
+package model
+
+import (
+	"fmt"
+	"time"
+)
+
+type GameID string
+
+type Game struct {
+	ID           GameID    `json:"id"`
+	Added        time.Time `json:"added"`
+	Author       PlayerID  `json:"author"`
+	Team0Player0 PlayerID  `json:"t0p0"`
+	Team0Player1 PlayerID  `json:"t0p1"`
+	Team1Player0 PlayerID  `json:"t1p0"`
+	Team1Player1 PlayerID  `json:"t1p1"`
+	Score        int       `json:"score"`
+	Overtime     bool      `jsone:"ot"`
+}
+
+func (id *GameID) Scan(src any) error {
+	switch v := src.(type) {
+	case int64:
+		*id = GameID(fmt.Sprintf("%d", v))
+    return nil
+	case string:
+		*id = GameID(v)
+		return nil
+	default:
+		return fmt.Errorf("unsupported type %T for GameID", src)
+	}
+}

internal/model/gameResult.go

@@ -0,0 +1,26 @@
+package model
+
+import "fmt"
+
+type GameResultID string
+
+type GameResult struct {
+	ID       GameResultID
+	Game     GameID
+	Player   PlayerID
+	StartElo int
+	EndElo   int
+}
+
+func (id *GameResultID) Scan(src any) error {
+	switch v := src.(type) {
+	case int64:
+		*id = GameResultID(fmt.Sprintf("%d", v)) // Convert int64 to string and assign it
+		return nil
+	case string:
+		*id = GameResultID(v)
+		return nil
+	default:
+		return fmt.Errorf("unsupported type %T for GameResultID", src)
+	}
+}

internal/model/player.go

@@ -0,0 +1,31 @@
+package model
+
+import "fmt"
+
+type PlayerID string
+
+type Player struct {
+	ID  PlayerID
+  Name string
+	Elo int
+}
+
+func NewPlayer(name string) Player {
+	return Player{
+    Name: name,
+		Elo: 1000,
+	}
+}
+
+func (id *PlayerID) Scan(src any) error {
+	switch v := src.(type) {
+	case int64:
+		*id = PlayerID(fmt.Sprintf("%d", v)) // Convert int64 to string and assign it
+		return nil
+	case string:
+		*id = PlayerID(v)
+		return nil
+	default:
+		return fmt.Errorf("unsupported type %T for PlayerID", src)
+	}
+}

internal/repo/repo.go

@@ -0,0 +1,40 @@
+package repo
+
+import (
+	model "git.kapelle.org/niklas/beerpong-elo/internal/model"
+)
+
+type Repo interface {
+	// Add a new game to the repo. ID needs to be nil on argument. PlayerID are fetched beforehand.
+	AddGame(model.Game) (model.GameID, error)
+
+	// Get a game by ID. Returns nil if not found.
+	GetGame(model.GameID) (*model.Game, error)
+
+	// Get ID of a player. Creates one if not found.
+	GetOrCreatePlayerID(string) (model.PlayerID, error)
+
+	// Get player by id. Returns nil if not found.
+	GetPlayer(model.PlayerID) (*model.Player, error)
+
+	// Adds a game result. ID needs to be nil on argument.
+	AddGameResult(model.GameResult) (model.GameResultID, error)
+
+	// Get a game result by ID. Returns nil if not found.
+	GetGameResult(model.GameResultID) (*model.GameResult, error)
+
+	// Get a game result for a player in a game
+	GetGameResultForPlayerAndGame(model.GameID, model.PlayerID) (*model.GameResult, error)
+
+  // Get all game results for a player
+	GetGameResultsForPlayer(model.PlayerID) ([]*model.GameResult, error)
+
+	// Get games for a player
+	GetGamesForPlayer(model.PlayerID) ([]*model.Game, error)
+
+  // Get all players
+  GetPlayers() ([]*model.Player, error)
+
+  // Get all games
+  GetGames() ([]*model.Game, error)
+}

internal/repo/sqlRepo.go

@@ -0,0 +1,279 @@
+package repo
+
+import (
+	"database/sql"
+	"fmt"
+	"time"
+
+	"git.kapelle.org/niklas/beerpong-elo/internal/model"
+	_ "github.com/go-sql-driver/mysql"
+)
+
+type SQLRepo struct {
+	db *sql.DB
+}
+
+func NewSQLRepo(host, username, password, dbName string) (Repo, error) {
+	db, err := sql.Open("mysql", fmt.Sprintf("%s:%s@tcp(%s)/%s?parseTime=true", username, password, host, dbName))
+	if err != nil {
+		return nil, err
+	}
+
+	db.SetConnMaxLifetime(time.Minute * 3)
+	db.SetMaxOpenConns(10)
+	db.SetMaxIdleConns(10)
+
+	return &SQLRepo{
+		db: db,
+	}, nil
+}
+
+func (s *SQLRepo) AddGame(game model.Game) (model.GameID, error) {
+	stmt, err := s.db.Prepare("INSERT INTO Games(added,score,overtime,author,team0player0,team0player1,team1player0,team1player1) VALUES (?,?,?,?,?,?,?,?)")
+	if err != nil {
+		return "", err
+	}
+
+	res, err := stmt.Exec(game.Added, game.Score, game.Overtime, game.Author, game.Team0Player0, game.Team0Player1, game.Team1Player0, game.Team1Player1)
+	if err != nil {
+		return "", err
+	}
+
+	id, err := res.LastInsertId()
+	if err != nil {
+		return "", err
+	}
+
+	var gameID model.GameID
+	gameID.Scan(id)
+
+	return gameID, nil
+}
+
+func (s *SQLRepo) AddGameResult(gameResult model.GameResult) (model.GameResultID, error) {
+	stms, err := s.db.Prepare("INSERT INTO GameResults(game,player,startElo,endElo) VALUES (?,?,?,?)")
+	if err != nil {
+		return "", err
+	}
+
+	res, err := stms.Exec(gameResult.Game, gameResult.Player, gameResult.StartElo, gameResult.EndElo)
+	if err != nil {
+		return "", err
+	}
+
+	id, err := res.LastInsertId()
+	if err != nil {
+		return "", err
+	}
+
+	var gameResultID model.GameResultID
+	gameResultID.Scan(id)
+
+	return gameResultID, nil
+}
+
+func (s *SQLRepo) GetGame(id model.GameID) (*model.Game, error) {
+	rows := s.db.QueryRow("SELECT id,added, score,overtime,author,team0player0,team0player1,team1player0,team1player1 FROM Games WHERE id = ? ", id)
+
+	var game model.Game
+
+	if err := rows.Scan(&game.ID, &game.Added, &game.Score, &game.Overtime, &game.Author, &game.Team0Player0, &game.Team0Player1, &game.Team1Player0, &game.Team1Player1); err != nil {
+		if err == sql.ErrNoRows {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	return &game, nil
+}
+
+func (s *SQLRepo) GetGameResult(id model.GameResultID) (*model.GameResult, error) {
+	rows := s.db.QueryRow("SELECT game,player,startElo,endElo FROM GameResults WHERE id = ? ", id)
+
+	var gameResult model.GameResult
+	gameResult.ID = id
+
+	if err := rows.Scan(&gameResult.Game, &gameResult.Player, &gameResult.StartElo, &gameResult.EndElo); err != nil {
+		if err == sql.ErrNoRows {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	return &gameResult, nil
+}
+
+func (s *SQLRepo) playerWithNameExists(name string) (*model.PlayerID, error) {
+	rows := s.db.QueryRow("SELECT id FROM Players WHERE name = ?", name)
+
+	var id model.PlayerID
+
+	if err := rows.Scan(&id); err != nil {
+		if err == sql.ErrNoRows {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	return &id, nil
+}
+
+func (s *SQLRepo) GetOrCreatePlayerID(name string) (model.PlayerID, error) {
+	foundID, err := s.playerWithNameExists(name)
+	if err != nil {
+		return "", err
+	}
+
+	if foundID != nil {
+		return *foundID, nil
+	}
+
+	stmt, err := s.db.Prepare("INSERT INTO Players(name,elo) VALUES (?,?)")
+	if err != nil {
+		return "", err
+	}
+
+	newPlayer := model.NewPlayer(name)
+
+	res, err := stmt.Exec(newPlayer.Name, newPlayer.Elo)
+	if err != nil {
+		return "", err
+	}
+
+	id, err := res.LastInsertId()
+	if err != nil {
+		return "", err
+	}
+
+	var playerID model.PlayerID
+	playerID.Scan(id)
+
+	return playerID, nil
+}
+
+func (s *SQLRepo) GetPlayer(id model.PlayerID) (*model.Player, error) {
+	rows := s.db.QueryRow("SELECT name,elo from Players WHERE id = ?", id)
+
+	var player model.Player
+	player.ID = id
+
+	if err := rows.Scan(&player.Name, &player.Elo); err != nil {
+		if err == sql.ErrNoRows {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	return &player, nil
+}
+
+func (s *SQLRepo) GetGamesForPlayer(id model.PlayerID) ([]*model.Game, error) {
+	rows, err := s.db.Query(`
+  SELECT id,added, score,overtime,author,team0player0,team0player1,team1player0,team1player1 
+  FROM Games
+  WHERE team0player0 = ? OR team0player1 = ? OR team1player0 = ? OR team1player1 = ?
+  `, id, id, id, id)
+
+	if err != nil {
+		return nil, err
+	}
+
+	defer rows.Close()
+
+	rtn := []*model.Game{}
+
+	for rows.Next() {
+		var game model.Game
+		err = rows.Scan(&game.ID, &game.Added, &game.Score, &game.Overtime, &game.Author, &game.Team0Player0, &game.Team0Player1, &game.Team1Player0, &game.Team1Player1)
+
+		if err != nil {
+			return nil, err
+		}
+
+		rtn = append(rtn, &game)
+	}
+
+	return rtn, nil
+}
+
+func (s *SQLRepo) GetGameResultForPlayerAndGame(gameID model.GameID, playerID model.PlayerID) (*model.GameResult, error) {
+	rows := s.db.QueryRow("SELECT id,game,player,startElo,endElo FROM GameResults WHERE game = ? AND player = ? ", gameID, playerID)
+
+	var gameResult model.GameResult
+
+	if err := rows.Scan(&gameResult.ID, &gameResult.Game, &gameResult.Player, &gameResult.StartElo, &gameResult.EndElo); err != nil {
+		if err == sql.ErrNoRows {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	return &gameResult, nil
+}
+
+func (s *SQLRepo) GetGameResultsForPlayer(id model.PlayerID) ([]*model.GameResult, error) {
+	rows, err := s.db.Query("SELECT id,game,player,startElo,endElo FROM GameResults WHERE player = ? ", id)
+
+	if err != nil {
+		return nil, err
+	}
+
+	rtn := []*model.GameResult{}
+
+	for rows.Next() {
+		var gameResult model.GameResult
+
+		err = rows.Scan(&gameResult.ID, &gameResult.Game, &gameResult.Player, &gameResult.StartElo, &gameResult.EndElo)
+		if err != nil {
+			return nil, err
+		}
+
+		rtn = append(rtn, &gameResult)
+	}
+
+	return rtn, nil
+}
+
+func (s *SQLRepo) GetPlayers() ([]*model.Player, error) {
+	rows, err := s.db.Query("SELECT id, name, elo FROM Players")
+	if err != nil {
+		return nil, err
+	}
+
+	rtn := []*model.Player{}
+
+	for rows.Next() {
+		var player model.Player
+
+		err = rows.Scan(&player.ID, &player.Name, &player.Elo)
+		if err != nil {
+			return nil, err
+		}
+
+		rtn = append(rtn, &player)
+	}
+
+	return rtn, nil
+}
+
+func (s *SQLRepo) GetGames() ([]*model.Game, error) {
+	rows, err := s.db.Query("SELECT id,added, score,overtime,author,team0player0,team0player1,team1player0,team1player1 FROM Games")
+	if err != nil {
+		return nil, err
+	}
+
+	rtn := []*model.Game{}
+
+	for rows.Next() {
+		var game model.Game
+		err = rows.Scan(&game.ID, &game.Added, &game.Score, &game.Overtime, &game.Author, &game.Team0Player0, &game.Team0Player1, &game.Team1Player0, &game.Team1Player1)
+
+		if err != nil {
+			return nil, err
+		}
+
+		rtn = append(rtn, &game)
+	}
+
+	return rtn, nil
+}

internal/repo/sqlSchema.sql

@@ -0,0 +1,44 @@
+CREATE TABLE Players (
+    id INT AUTO_INCREMENT PRIMARY KEY, 
+    name VARCHAR(255) NOT NULL,
+    elo INT
+);
+
+CREATE TABLE Games (
+    id INT AUTO_INCREMENT PRIMARY KEY, 
+    added DATETIME NOT NULL,
+    score INT NOT NULL,
+    overtime BOOL NOT NULL,
+    author INT,
+    team0player0 INT,
+    team0player1 INT,
+    team1player0 INT,
+    team1player1 INT,                    
+    FOREIGN KEY (author) REFERENCES Players(id) on DELETE SET NULL,
+    FOREIGN KEY (team0player0) REFERENCES Players(id) ON DELETE SET NULL,
+    FOREIGN KEY (team0player1) REFERENCES Players(id) ON DELETE SET NULL,
+    FOREIGN KEY (team1player0) REFERENCES Players(id) ON DELETE SET NULL,
+    FOREIGN KEY (team1player1) REFERENCES Players(id) ON DELETE SET NULL
+);
+
+CREATE TABLE GameResults (
+  id INT AUTO_INCREMENT PRIMARY KEY,
+  game INT,
+  player INT,
+  startElo INT,
+  endElo INT,
+  FOREIGN KEY (game) REFERENCES Games(id) on DELETE SET NULL,
+  FOREIGN KEY (player) REFERENCES Players(id) on DELETE SET NULL
+)
+
+DELIMITER $$
+CREATE TRIGGER UpdateCurrentELO
+AFTER INSERT ON GameResults
+FOR EACH ROW
+BEGIN
+    UPDATE Players
+    SET elo = NEW.endElo
+    WHERE id = NEW.player;
+END$$
+
+DELIMITER ;

internal/web/gqlSchema.go

@@ -0,0 +1,369 @@
+package web
+
+import (
+	"log"
+
+	"git.kapelle.org/niklas/beerpong-elo/internal/model"
+	"git.kapelle.org/niklas/beerpong-elo/internal/repo"
+	"github.com/graphql-go/graphql"
+)
+
+func createShema(repo repo.Repo) graphql.Schema {
+
+	player := graphql.NewObject(graphql.ObjectConfig{
+		Name:        "Player",
+		Description: "A player. Can also be authors of games",
+		Fields: graphql.Fields{
+			"ID": &graphql.Field{
+				Type: graphql.NewNonNull(graphql.ID),
+			},
+			"name": &graphql.Field{
+				Type: graphql.NewNonNull(graphql.String),
+			},
+			"elo": &graphql.Field{
+				Type: graphql.NewNonNull(graphql.Int),
+			},
+
+			// Field "games" added below
+			// Field "history" added below
+		},
+	})
+
+	game := graphql.NewObject(graphql.ObjectConfig{
+		Name:        "Game",
+		Description: "A game played",
+		Fields: graphql.Fields{
+			"id": &graphql.Field{
+				Type: graphql.NewNonNull(graphql.ID),
+			},
+			"added": &graphql.Field{
+				Type: graphql.NewNonNull(graphql.DateTime),
+			},
+			"overtime": &graphql.Field{
+				Type: graphql.NewNonNull(graphql.Boolean),
+			},
+			"score": &graphql.Field{
+				Type: graphql.NewNonNull(graphql.Int),
+			},
+			"author": &graphql.Field{
+				Type: graphql.NewNonNull(player),
+				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+					game, ok := p.Source.(*model.Game)
+					if !ok {
+						log.Printf("Can't get source for field 'author' on 'Game' is %v", p.Source)
+						return nil, nil
+					}
+
+					player, err := repo.GetPlayer(game.Author)
+					if err != nil {
+						return nil, err
+					}
+
+					return player, nil
+				},
+			},
+			"team0player0": &graphql.Field{
+				Type: graphql.NewNonNull(player),
+				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+					game, ok := p.Source.(*model.Game)
+					if !ok {
+						log.Printf("Can't get source for field 'team0player0' on 'Game' is %v", p.Source)
+						return nil, nil
+					}
+
+					player, err := repo.GetPlayer(game.Team0Player0)
+					if err != nil {
+						return nil, err
+					}
+
+					return player, nil
+				},
+			},
+			"team0player1": &graphql.Field{
+				Type: graphql.NewNonNull(player),
+				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+					game, ok := p.Source.(*model.Game)
+					if !ok {
+						log.Printf("Can't get source for field 'team0player1' on 'Game' is %v", p.Source)
+						return nil, nil
+					}
+
+					player, err := repo.GetPlayer(game.Team0Player1)
+					if err != nil {
+						return nil, err
+					}
+
+					return player, nil
+				},
+			},
+			"team1player0": &graphql.Field{
+				Type: graphql.NewNonNull(player),
+				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+					game, ok := p.Source.(*model.Game)
+					if !ok {
+						log.Printf("Can't get source for field 'team1player0' on 'Game' is %v", p.Source)
+						return nil, nil
+					}
+
+					player, err := repo.GetPlayer(game.Team1Player0)
+					if err != nil {
+						return nil, err
+					}
+
+					return player, nil
+				},
+			},
+			"team1player1": &graphql.Field{
+				Type: graphql.NewNonNull(player),
+				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+					game, ok := p.Source.(*model.Game)
+					if !ok {
+						log.Printf("Can't get source for field 'team1player1' on 'Game' is %v", p.Source)
+						return nil, nil
+					}
+
+					player, err := repo.GetPlayer(game.Team1Player1)
+					if err != nil {
+						return nil, err
+					}
+
+					return player, nil
+				},
+			},
+		},
+	})
+
+	player.AddFieldConfig("games", &graphql.Field{
+		Type: graphql.NewNonNull(graphql.NewList(game)),
+		Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+			player, ok := p.Source.(*model.Player)
+
+			if !ok {
+				log.Printf("Can't get source for field 'games' on 'Player' is %v", p.Source)
+				return nil, nil
+			}
+
+			games, err := repo.GetGamesForPlayer(player.ID)
+
+			if err != nil {
+				return nil, err
+			}
+
+			return games, nil
+		},
+	})
+
+	gameResult := graphql.NewObject(graphql.ObjectConfig{
+		Name:        "GameResult",
+		Description: "The ELO change for a player in a game",
+		Fields: graphql.Fields{
+			"id": &graphql.Field{
+				Type: graphql.NewNonNull(graphql.ID),
+			},
+			"player": &graphql.Field{
+				Type: player,
+				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+					gameResult, ok := p.Source.(*model.GameResult)
+					if !ok {
+						log.Printf("Can't get source for field 'player' on 'GameResult' is %v", p.Source)
+						return nil, nil
+					}
+
+					player, err := repo.GetPlayer(gameResult.Player)
+					if err != nil {
+						return nil, err
+					}
+
+					return player, nil
+				},
+			},
+			"game": &graphql.Field{
+				Type: graphql.NewNonNull(game),
+				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+					gameResult, ok := p.Source.(*model.GameResult)
+					if !ok {
+						log.Printf("Can't get source for field 'game' on 'GameResult' is %v", p.Source)
+						return nil, nil
+					}
+
+					game, err := repo.GetGame(gameResult.Game)
+					if err != nil {
+						return nil, err
+					}
+
+					return game, nil
+				},
+			},
+			"startElo": &graphql.Field{
+				Type: graphql.NewNonNull(graphql.Int),
+			},
+			"endElo": &graphql.Field{
+				Type: graphql.NewNonNull(graphql.Int),
+			},
+			"delta": &graphql.Field{
+				Type: graphql.NewNonNull(graphql.Int),
+				Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+					gameResult, ok := p.Source.(*model.GameResult)
+					if !ok {
+						log.Printf("Can't get source for field 'delta' on 'GameResult' is %v", p.Source)
+						return nil, nil
+					}
+
+					delta := gameResult.EndElo - gameResult.StartElo
+					return delta, nil
+				},
+			},
+		},
+	})
+
+	player.AddFieldConfig("history", &graphql.Field{
+		Type: graphql.NewNonNull(graphql.NewList(gameResult)),
+		Args: graphql.FieldConfigArgument{
+			"game": &graphql.ArgumentConfig{
+				Type:        graphql.ID,
+				Description: "Filter by Game ID",
+			},
+		},
+		Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+			player, ok := p.Source.(*model.Player)
+			if !ok {
+				log.Printf("Can't get source from field 'history' on 'player' is %v", p.Source)
+				return nil, nil
+			}
+
+			if p.Args["game"] != nil {
+				// Find result for single game
+				gameID, ok := p.Args["game"].(string)
+				if !ok {
+					log.Printf("Failed to parse 'game' at field 'history' on 'player' is %v", p.Args["game"])
+					return nil, nil
+				}
+
+				gameResult, err := repo.GetGameResultForPlayerAndGame(model.GameID(gameID), player.ID)
+				if err != nil {
+					return nil, err
+				}
+
+				return []*model.GameResult{gameResult}, nil
+			}
+
+			// Find all gameResults for a player
+
+			gameResults, err := repo.GetGameResultsForPlayer(player.ID)
+			if err != nil {
+				return nil, err
+			}
+
+			return gameResults, nil
+		},
+	})
+
+	queryFields := graphql.Fields{
+		"player": &graphql.Field{
+			Type:        player,
+			Description: "Get player by ID",
+			Args: graphql.FieldConfigArgument{
+				"id": &graphql.ArgumentConfig{
+					Type: graphql.NewNonNull(graphql.ID),
+				},
+			},
+			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+				id, ok := p.Args["id"].(string)
+				if !ok {
+					log.Printf("Failed to parse ID at player: %v", p.Args["id"])
+					return nil, nil
+				}
+
+				player, err := repo.GetPlayer(model.PlayerID(id))
+				if err != nil {
+					return nil, err
+				}
+
+				return player, nil
+			},
+		},
+		"game": &graphql.Field{
+			Type:        game,
+			Description: "Get game by ID",
+			Args: graphql.FieldConfigArgument{
+				"id": &graphql.ArgumentConfig{
+					Type: graphql.NewNonNull(graphql.ID),
+				},
+			},
+			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+				id, ok := p.Args["id"].(string)
+				if !ok {
+					log.Printf("Failed to parse ID at game: %v", p.Args["id"])
+					return nil, nil
+				}
+
+				game, err := repo.GetGame(model.GameID(id))
+				if err != nil {
+					return nil, err
+				}
+
+				return game, nil
+			},
+		},
+		"gameResult": &graphql.Field{
+			Type:        gameResult,
+			Description: "Result of a game on a players ELO",
+			Args: graphql.FieldConfigArgument{
+				"id": &graphql.ArgumentConfig{
+					Type: graphql.NewNonNull(graphql.ID),
+				},
+			},
+			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+				id, ok := p.Args["id"].(string)
+				if !ok {
+					log.Printf("Failed to parse ID at gameResult: %v", p.Args["id"])
+					return nil, nil
+				}
+
+				gameResult, err := repo.GetGameResult(model.GameResultID(id))
+				if err != nil {
+					return nil, err
+				}
+
+				return gameResult, nil
+			},
+		},
+		"players": &graphql.Field{
+			Type:        graphql.NewNonNull(graphql.NewList(player)),
+			Description: "Get all players",
+			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+				players, err := repo.GetPlayers()
+				if err != nil {
+					return nil, err
+				}
+
+				return players, nil
+			},
+		},
+		"games": &graphql.Field{
+			Type:        graphql.NewNonNull(graphql.NewList(game)),
+			Description: "Get all games",
+			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+				games, err := repo.GetGames()
+				if err != nil {
+					return nil, err
+				}
+
+				return games, nil
+			},
+		},
+	}
+
+	querySchema := graphql.ObjectConfig{
+		Name:   "Query",
+		Fields: queryFields,
+	}
+
+	schemaConfig := graphql.SchemaConfig{Query: graphql.NewObject(querySchema)}
+	schema, err := graphql.NewSchema(schemaConfig)
+	if err != nil {
+		log.Fatalf("failed to create new schema, error: %v", err)
+	}
+
+	return schema
+}

internal/web/staticFiles.go

@@ -0,0 +1,28 @@
+package web
+
+import (
+	"embed"
+	"io/fs"
+	"net/http"
+	"os"
+)
+
+//go:embed static/*
+var staticFiles embed.FS
+
+type spaFileSystem struct {
+	root http.FileSystem
+}
+
+func (spa *spaFileSystem) Open(name string) (http.File, error) {
+	f, err := spa.root.Open(name)
+	if os.IsNotExist(err) {
+		return spa.root.Open("index.html")
+	}
+	return f, err
+}
+
+func initStatic(mux *http.ServeMux) {
+	staticFS, _ := fs.Sub(staticFiles, "static")
+	mux.Handle("/", http.FileServer(&spaFileSystem{http.FS(staticFS)}))
+}

internal/web/web.go

@@ -0,0 +1,24 @@
+package web
+
+import (
+	"net/http"
+
+	"git.kapelle.org/niklas/beerpong-elo/internal/repo"
+	"github.com/graphql-go/handler"
+)
+
+func CreateWebserver(repo repo.Repo) *http.ServeMux {
+	router := http.NewServeMux()
+	schema := createShema(repo)
+
+	gqlHandler := handler.New(&handler.Config{
+		Schema:   &schema,
+		Pretty:   true,
+		GraphiQL: true,
+	})
+
+	router.Handle("/graphql", gqlHandler)
+  initStatic(router)
+
+	return router
+}