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// Draftsim server implementation
// TODO: implement timeout
// TODO: implement reconnect
// TODO: persist draft rates
package main
import (
"encoding/json"
"errors"
"flag"
"io"
"log"
"net/http"
"os"
"strings"
"sync"
"github.com/adrg/xdg"
"github.com/gorilla/websocket"
"muhq.space/muhqs-game/go/draftsim/common"
"muhq.space/muhqs-game/go/game"
)
type table struct {
id string
draft *game.Draft
lock sync.Mutex
rates draftRates
rwlock sync.RWMutex
}
type draftRates struct {
rates map[string]float32
lock sync.RWMutex
}
var tables map[string]*table
var rates draftRates
func (rates *draftRates) loadFrom(path string) (err error) {
if path == "" {
path, err = xdg.DataFile("draftsim/rates.json")
if err != nil {
return
}
}
f, err := os.Open(path)
if err != nil {
return
}
defer f.Close()
d, err := io.ReadAll(f)
if err != nil {
return
}
err = json.Unmarshal(d, &rates.rates)
return
}
func (r *draftRates) updateRateUnsafe(card string, rate float32) {
if _, found := r.rates[card]; !found {
r.rates[card] = rate
} else {
r.rates[card] = (r.rates[card] + rate) / 2
}
}
func (r *draftRates) updateRate(card string, rate float32) {
r.lock.Lock()
defer r.lock.Unlock()
r.updateRateUnsafe(card, rate)
}
func (r *draftRates) mergeRates(r2 *draftRates) {
r.lock.Lock()
defer r.lock.Unlock()
for c, v := range r2.rates {
r.updateRateUnsafe(c, v)
}
}
type recordingDraftCtrl struct {
game.RWPlayerControl
table *table
}
type gorillaConnRW struct {
c *websocket.Conn
}
func (rw gorillaConnRW) Read(p []byte) (int, error) {
_, r, err := rw.c.NextReader()
if err != nil {
return 0, err
}
return r.Read(p)
}
func (rw gorillaConnRW) Write(p []byte) (int, error) {
w, err := rw.c.NextWriter(websocket.TextMessage)
if err != nil {
return 0, err
}
return w.Write(p)
}
func (rw gorillaConnRW) Close() (error) {
return rw.c.Close()
}
func newRecordingDraftCrtl(p *game.Player, table *table, c *websocket.Conn) *recordingDraftCtrl {
return &recordingDraftCtrl{
*game.NewRWPlayerControl(p, gorillaConnRW{c}, nil),
table,
}
}
// Record the received draft pick.
func (ctrl *recordingDraftCtrl) RecvAction() game.Action {
pick := ctrl.RWPlayerControl.RecvAction().(*game.DraftPick)
rate := float32(pick.Pack().Size() / ctrl.table.draft.PackSize())
ctrl.table.rates.updateRate(pick.Pick().Name, rate)
return pick
}
var upgrader = websocket.Upgrader {
// FIXME: find a way to send an Origin header using wasm
CheckOrigin: func(*http.Request) bool { return true },
}
func joinDraft(w http.ResponseWriter, r *http.Request) {
c, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Println("upgrade failed:", err)
}
var args common.JoinParams
err = c.ReadJSON(&args)
if err != nil {
c.WriteJSON("failed to parse request body")
c.Close()
return
}
tableId := args.Table
var found bool
var t *table
if t, found = tables[tableId]; !found {
t = &table{id: tableId, draft: game.NewDraftFromDesc([]*game.Player{}, args.Desc)}
tables[tableId] = t
}
t.lock.Lock()
defer t.lock.Unlock()
p := game.NewPlayer(-1, args.Name, game.NewDeck(), nil, nil)
p.Ctrl = newRecordingDraftCrtl(p, t, c)
t.draft.AddPlayer(p)
}
func startDraft(w http.ResponseWriter, r *http.Request) {
body, err := io.ReadAll(r.Body)
w.Header().Set("Access-Control-Allow-Origin", "*")
if err != nil {
http.Error(w, "failed to read request body", 400)
}
tableId := string(body)
if t, found := tables[tableId]; found {
go func() {
t.draft.Run()
for _, p := range t.draft.Players() {
p.Ctrl.(*recordingDraftCtrl).Close()
}
rates.mergeRates(&t.rates)
}()
} else {
http.Error(w, "table not found", 404)
}
}
func allStats(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Content-Type", "application/json")
rates.lock.RLock()
resp, _ := json.Marshal(rates.rates)
rates.lock.RUnlock()
w.Write(resp)
}
func specificStats(w http.ResponseWriter, r *http.Request) {
body, err := io.ReadAll(r.Body)
if err != nil {
http.Error(w, "failed to read request body", 400)
}
cards := string(body)
specific := make(map[string]float32)
rates.lock.RLock()
for card := range strings.SplitSeq(cards, "\n") {
specific[card] = rates.rates[card]
}
rates.lock.RUnlock()
resp, _ := json.Marshal(specific)
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Content-Type", "application/json")
w.Write(resp)
}
func cardStat(w http.ResponseWriter, r *http.Request) {
card := r.PathValue("card")
rates.lock.RLock()
resp, _ := json.Marshal(rates.rates[card])
rates.lock.RUnlock()
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Content-Type", "application/json")
w.Write(resp)
}
var ratesFile = flag.String("ratesfile", "", "file to persist the rates")
var addr = flag.String("addr", ":8080", "http service address")
func main() {
tables = make(map[string]*table)
rates = draftRates{rates: make(map[string]float32)}
flag.Parse()
if err := rates.loadFrom(*ratesFile); err != nil && !errors.Is(err, os.ErrNotExist) {
log.Fatal(err)
}
http.HandleFunc("/join", joinDraft)
http.HandleFunc("POST /start", startDraft)
http.HandleFunc("GET /stats", allStats)
http.HandleFunc("POST /stats", specificStats)
http.HandleFunc("GET /stats/{card}", cardStat)
log.Println("listening on", *addr)
if err := http.ListenAndServe(*addr, nil); err != nil {
log.Fatal(err)
}
}
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