commit 1bbbda53851f5de13535e95143e598c29e80fa51
Author: sati.ac <sati.ac@proton.me>
Date:   Wed Jun 28 13:56:39 2023 +0300

    initial commit

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..38c079c
--- /dev/null
+++ b/README.md
@@ -0,0 +1 @@
+# sati-go - golang api wrapper for [sati.ac](sati.ac)
\ No newline at end of file
diff --git a/events.go b/events.go
new file mode 100644
index 0000000..0226867
--- /dev/null
+++ b/events.go
@@ -0,0 +1,80 @@
+package sati
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/mitchellh/mapstructure"
+)
+
+type EventBus struct {
+	mu         *sync.Mutex
+	idCounter  uint32
+	handlers   map[string]map[uint32]func(data any)
+	eventTypes map[string]any
+}
+
+type EventHandler struct {
+	id    uint32
+	type_ string
+	bus   *EventBus
+}
+
+func (e *EventHandler) Off() {
+	e.bus.mu.Lock()
+	defer e.bus.mu.Unlock()
+
+	delete(e.bus.handlers[e.type_], e.id)
+}
+
+func (e *EventBus) On(event string, handler func(data any)) (*EventHandler, error) {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	if _, ok := e.eventTypes[event]; !ok {
+		return nil, fmt.Errorf("bad event type")
+	}
+
+	e.idCounter++
+	e.handlers[event][e.idCounter] = handler
+	return &EventHandler{
+		id:    e.idCounter,
+		type_: event,
+		bus:   e,
+	}, nil
+}
+
+func (e *EventBus) dispatch(event string, data any) error {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	formattedData, ok := e.eventTypes[event]
+	if !ok {
+		return fmt.Errorf("bad event type")
+	}
+
+	if err := mapstructure.Decode(data, &formattedData); err != nil {
+		return err
+	}
+
+	for _, handler := range e.handlers[event] {
+		handler(formattedData)
+	}
+
+	return nil
+}
+
+// eventTypes values must be structs, not pointers
+func newEventBus(eventTypes map[string]any) *EventBus {
+	e := &EventBus{
+		mu:         &sync.Mutex{},
+		handlers:   make(map[string]map[uint32]func(data any)),
+		eventTypes: eventTypes,
+	}
+
+	for event := range eventTypes {
+		e.handlers[event] = make(map[uint32]func(data any))
+	}
+
+	return e
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..dff5a10
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,9 @@
+module git.sati.ac/sati.ac/sati-go
+
+go 1.20
+
+require (
+	github.com/gorilla/websocket v1.5.0
+	github.com/mitchellh/mapstructure v1.5.0
+	github.com/shopspring/decimal v1.3.1
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..814ee9a
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,6 @@
+github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
+github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
+github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
+github.com/shopspring/decimal v1.3.1 h1:2Usl1nmF/WZucqkFZhnfFYxxxu8LG21F6nPQBE5gKV8=
+github.com/shopspring/decimal v1.3.1/go.mod h1:DKyhrW/HYNuLGql+MJL6WCR6knT2jwCFRcu2hWCYk4o=
diff --git a/sati.go b/sati.go
new file mode 100644
index 0000000..54c7120
--- /dev/null
+++ b/sati.go
@@ -0,0 +1,85 @@
+package sati
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/mitchellh/mapstructure"
+	"github.com/shopspring/decimal"
+)
+
+type Config struct {
+	ReconnectionInterval time.Duration
+	Endpoint             string
+	Debug                bool
+	Token                string
+}
+
+func NewConfig(token string) Config {
+	return Config{
+		ReconnectionInterval: time.Second,
+		Debug:                false,
+		Endpoint:             "wss://api.sati.ac/ws",
+		Token:                token,
+	}
+}
+
+type Api struct {
+	socket *socket
+}
+
+func (a *Api) Solve(task AnyTask, result any) (*TaskEntity, error) {
+	createdTask := CreateTaskResult{}
+	if err := a.socket.call("createTask", task.serialize(), &createdTask); err != nil {
+		return nil, err
+	}
+
+	resultCh := make(chan *TaskUpdateEvent)
+	handler, err := a.socket.events.On("taskUpdate", func(data any) {
+		e := data.(TaskUpdateEvent)
+		if createdTask.Id == e.Id && (e.State == "error" || e.State == "success") {
+			resultCh <- &e
+		}
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	solvedTask := <-resultCh
+	handler.Off()
+
+	if solvedTask.State == "error" {
+		return nil, fmt.Errorf("sati: failed to solve task")
+	}
+
+	if err := mapstructure.Decode(solvedTask.Result, result); err != nil {
+		return nil, err
+	}
+
+	return (*TaskEntity)(solvedTask), nil
+}
+
+func (a *Api) GetBalance() (*decimal.Decimal, error) {
+	result := GetBalanceResult{}
+	if err := a.socket.call("getBalance", &GetBalanceRequest{}, &result); err != nil {
+		return nil, err
+	}
+
+	balance, err := decimal.NewFromString(result.Balance)
+	if err != nil {
+		return nil, err
+	}
+
+	return &balance, nil
+}
+
+func (a *Api) Dispose() {
+	a.socket.close()
+}
+
+func NewApi(config Config) *Api {
+	return &Api{
+		socket: newSocket(config),
+	}
+}
diff --git a/socket.go b/socket.go
new file mode 100644
index 0000000..e917b0b
--- /dev/null
+++ b/socket.go
@@ -0,0 +1,285 @@
+package sati
+
+import (
+	"fmt"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/gorilla/websocket"
+	"github.com/mitchellh/mapstructure"
+)
+
+const (
+	stReconnecting uint32 = iota
+	stConnected
+	stUnrecoverable
+)
+
+type message struct {
+	Type string
+	Id   uint32
+	Data any
+	To   uint32
+}
+
+type outgoingMessage struct {
+	msg    message
+	result chan *incomingMessage
+}
+
+type incomingMessage struct {
+	msg *message
+	err error
+}
+
+type socket struct {
+	idCounter          uint32
+	state              uint32
+	unrecoverableError error
+	closeNotifier      chan struct{}
+	outgoing           chan *outgoingMessage
+	ws                 *websocket.Conn
+	awaitedReplies     map[uint32]chan *incomingMessage
+	mu                 *sync.Mutex
+	events             *EventBus
+	config             Config
+}
+
+func (s *socket) reciever() {
+	for {
+		var message message
+		if err := s.ws.ReadJSON(&message); err != nil {
+			if s.config.Debug {
+				fmt.Println("sati: got error while reading socket", err.Error())
+			}
+			s.mu.Lock()
+			for _, ch := range s.awaitedReplies {
+				ch <- &incomingMessage{
+					err: s.unrecoverableError,
+				}
+			}
+			s.awaitedReplies = make(map[uint32]chan *incomingMessage)
+			s.mu.Unlock()
+			s.closeNotifier <- struct{}{}
+			return
+		}
+
+		if s.config.Debug {
+			fmt.Println("sati: recieved message", &message)
+		}
+
+		switch message.Type {
+		case "auth":
+			fallthrough
+		case "call":
+			if message.To == 0 {
+				continue
+			}
+			s.mu.Lock()
+			resultCh, ok := s.awaitedReplies[message.To]
+			if ok {
+				delete(s.awaitedReplies, message.To)
+			}
+			s.mu.Unlock()
+			if resultCh != nil {
+				resultCh <- &incomingMessage{msg: &message}
+			}
+		case "event":
+			var event struct {
+				Type string `json:"type"`
+				Data any    `json:"data"`
+			}
+
+			mapstructure.Decode(message.Data, &event)
+			if err := s.events.dispatch(event.Type, event.Data); err != nil && s.config.Debug {
+				fmt.Println("sati: error while dispatching event:", err.Error())
+			}
+		}
+	}
+}
+
+func (s *socket) send(msg *outgoingMessage) error {
+	s.idCounter++
+	msg.msg.Id = s.idCounter
+	if msg.result != nil {
+		s.mu.Lock()
+		s.awaitedReplies[msg.msg.Id] = msg.result
+		s.mu.Unlock()
+	}
+
+	if s.config.Debug {
+		fmt.Println("sati: sending message", msg)
+	}
+
+	err := s.ws.WriteJSON(msg.msg)
+	if msg.result != nil && err != nil {
+		s.mu.Lock()
+		s.awaitedReplies[msg.msg.Id] <- &incomingMessage{
+			err: err,
+		}
+		delete(s.awaitedReplies, msg.msg.Id)
+		s.mu.Unlock()
+	}
+	return err
+}
+
+func (s *socket) sender() {
+	for {
+		select {
+		case msg := <-s.outgoing:
+			s.send(msg)
+		case <-s.closeNotifier:
+			return
+		}
+	}
+}
+
+func (s *socket) connect() error {
+	if s.config.Debug {
+		fmt.Println("sati: connecting")
+	}
+	ws, _, err := websocket.DefaultDialer.Dial(s.config.Endpoint, http.Header{})
+	if err != nil {
+		return err
+	}
+
+	s.mu.Lock()
+	s.state = stReconnecting
+	s.ws = ws
+	s.mu.Unlock()
+
+	resultChan := make(chan *incomingMessage)
+	s.send(&outgoingMessage{
+		message{
+			Type: "auth",
+			Data: struct {
+				Token string `json:"token"`
+			}{s.config.Token},
+		}, resultChan,
+	})
+
+	go s.reciever()
+
+	rawResult := <-resultChan
+	if rawResult.err != nil {
+		return rawResult.err
+	}
+
+	var result struct {
+		Success bool `json:"success"`
+	}
+
+	if err := mapstructure.Decode(rawResult.msg.Data, &result); err != nil {
+		return err
+	}
+
+	if !result.Success {
+		s.setUnrecoverableState("invalid auth token")
+		return s.unrecoverableError
+	}
+
+	s.sender()
+
+	return nil
+}
+
+func (s *socket) connector() {
+	for {
+		s.mu.Lock()
+		state := s.state
+		s.mu.Unlock()
+		if state == stUnrecoverable {
+			break
+		}
+
+		err := s.connect() // will block until disconnect
+		if s.config.Debug && err != nil {
+			fmt.Println("sati: disconnected", err.Error())
+		}
+		time.Sleep(s.config.ReconnectionInterval)
+	}
+}
+
+func (s *socket) setUnrecoverableState(err string) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.state == stUnrecoverable {
+		return
+	}
+	s.unrecoverableError = fmt.Errorf("sati: %s", err)
+	s.state = stUnrecoverable
+	s.ws.Close()
+}
+
+func newSocket(config Config) *socket {
+	s := &socket{
+		closeNotifier:  make(chan struct{}),
+		outgoing:       make(chan *outgoingMessage),
+		awaitedReplies: make(map[uint32]chan *incomingMessage),
+		mu:             &sync.Mutex{},
+		events: newEventBus(map[string]any{
+			"taskUpdate":   TaskUpdateEvent{},
+			"tokenReissue": TokenReissueEvent{},
+		}),
+		config: config,
+	}
+
+	s.events.On("tokenReissue", func(any) {
+		s.setUnrecoverableState("token was reissued")
+	})
+
+	go s.connector()
+
+	return s
+}
+
+func (s *socket) close() {
+	s.setUnrecoverableState("socket closed")
+}
+
+func (s *socket) call(method string, data any, result any) error {
+	s.mu.Lock()
+	if s.state == stUnrecoverable {
+		err := s.unrecoverableError
+		s.mu.Unlock()
+		return err
+	}
+	s.mu.Unlock()
+
+	resultCh := make(chan *incomingMessage)
+	s.outgoing <- &outgoingMessage{
+		msg: message{
+			Type: "call",
+			Data: CallMessageOutgoing{
+				Method: method,
+				Data:   data,
+			},
+		},
+		result: resultCh,
+	}
+
+	resultMsg := <-resultCh
+	if resultMsg.err != nil {
+		return resultMsg.err
+	}
+
+	callResult := CallMessageIncoming{}
+	if err := mapstructure.Decode(resultMsg.msg.Data, &callResult); err != nil {
+		return err
+	}
+
+	if !callResult.Success {
+		callErr := &CallError{}
+		if err := mapstructure.Decode(callResult.Data, callErr); err != nil {
+			return err
+		}
+		return callErr
+	}
+
+	if err := mapstructure.Decode(callResult.Data, result); err != nil {
+		return err
+	}
+
+	return nil
+}
diff --git a/tasks.go b/tasks.go
new file mode 100644
index 0000000..d6b8a73
--- /dev/null
+++ b/tasks.go
@@ -0,0 +1,44 @@
+package sati
+
+type AnyTask interface {
+	serialize() task
+}
+
+type task struct {
+	Type string `json:"type"`
+	Data any    `json:"data"`
+}
+
+type TurnstileTask struct {
+	SiteKey string  `json:"siteKey"`
+	PageUrl string  `json:"pageUrl"`
+	CData   *string `json:"cData,omitempty"`
+	Action  *string `json:"action,omitempty"`
+}
+
+func (t *TurnstileTask) serialize() task {
+	return task{
+		Type: "Turnstile",
+		Data: t,
+	}
+}
+
+type TurnstileResult struct {
+	Token string `json:"token"`
+}
+
+type ReCaptcha2Task struct {
+	SiteKey string `json:"siteKey"`
+	PageUrl string `json:"pageUrl"`
+}
+
+func (t *ReCaptcha2Task) serialize() task {
+	return task{
+		Type: "ReCaptcha2",
+		Data: t,
+	}
+}
+
+type ReCaptcha2Result struct {
+	Token string `json:"token"`
+}
diff --git a/types.go b/types.go
new file mode 100644
index 0000000..14eaa27
--- /dev/null
+++ b/types.go
@@ -0,0 +1,42 @@
+package sati
+
+import (
+	"fmt"
+)
+
+type TokenReissueEvent struct{}
+
+type TaskUpdateEvent TaskEntity
+
+type CallMessageOutgoing struct {
+	Method string `json:"method"`
+	Data   any    `json:"data"`
+}
+
+type CallMessageIncoming struct {
+	Success bool `json:"success"`
+	Data    any  `json:"data"`
+}
+
+type CallError struct {
+	Description string `json:"description"`
+	Code        uint32 `json:"code"`
+}
+
+func (c *CallError) Error() string {
+	return fmt.Sprintf("sati: api: #%d %s", c.Code, c.Description)
+}
+
+type TaskEntity struct {
+	Id     uint32 `json:"id"`
+	Type   string `json:"type"`
+	State  string `json:"state"`
+	Cost   string `json:"cost"`
+	Result any    `json:"result"`
+}
+
+type CreateTaskResult TaskEntity
+type GetBalanceRequest struct{}
+type GetBalanceResult struct {
+	Balance string `json:"balance"`
+}