1 files changed, 0 insertions, 505 deletions
diff --git a/arbiter/arbiter.go b/arbiter/arbiter.go
deleted file mode 100644
index 6145a45..0000000
--- a/arbiter/arbiter.go
+++ /dev/null
@@ -1,505 +0,0 @@
-package main
-
-import (
-	"context"
-	"crypto/tls"
-	"encoding/json"
-	"errors"
-	"flag"
-	"io"
-	"net/http"
-	"net/url"
-	"os"
-	"os/signal"
-	"strconv"
-	"sync"
-	"time"
-
-	"github.com/go-redis/redis/v8"
-	"github.com/gorilla/mux"
-	"github.com/rs/zerolog"
-	"github.com/rs/zerolog/log"
-)
-
-var (
-	errBadLogic          = errors.New("we should not be here")
-	errUnexpectedParam   = errors.New("got unexpected parameter")
-	errUnknownDeployment = errors.New("unknown deployment kind")
-)
-
-const (
-	serverDeploymentType    = "SERVER_DEPLOYMENT_TYPE"
-	coingeckoAPIURLv3       = "https://api.coingecko.com/api/v3"
-	coincapAPIURLv2         = "https://api.coincap.io/v2"
-	getTimeout              = 5
-	httpClientTimeout       = 5
-	serverTLSReadTimeout    = 15
-	serverTLSWriteTimeout   = 15
-	defaultGracefulShutdown = 15
-)
-
-// https://docs.coincap.io/
-type CoinCapAssetGetResponseData struct {
-	ID                string `json:"id"`
-	Rank              string `json:"rank"`
-	Symbol            string `json:"symbol"`
-	Name              string `json:"name"`
-	Supply            string `json:"supply"`
-	MaxSupply         string `json:"maxSupply"`
-	MarketCapUsd      string `json:"marketCapUsd"`
-	VolumeUsd24Hr     string `json:"volumeUsd24Hr"`
-	PriceUsd          string `json:"priceUsd"`
-	ChangePercent24Hr string `json:"changePercent24Hr"`
-	Vwap24Hr          string `json:"vwap24Hr"`
-}
-
-type priceResponseData struct {
-	Name         string  `json:"name"`
-	Price        float64 `json:"price"`
-	Unit         string  `json:"unit"`
-	Err          string  `json:"err"`
-	IsSuccessful bool    `json:"isSuccessful"`
-}
-
-type CoinCapAssetGetResponse struct {
-	Data      CoinCapAssetGetResponseData `json:"data"`
-	TimeStamp int64                       `json:"timestamp"`
-}
-
-type HTTPHandlerFunc func(http.ResponseWriter, *http.Request)
-
-type HTTPHandler struct {
-	name     string
-	function HTTPHandlerFunc
-}
-
-type priceChanStruct struct {
-	name  string
-	price float64
-}
-
-type errorChanStruct struct {
-	hasError bool
-	err      error
-}
-
-func GetProxiedClient() *http.Client {
-	transport := &http.Transport{
-		DisableKeepAlives: true,
-		Proxy:             http.ProxyFromEnvironment,
-	}
-	client := &http.Client{
-		Transport:     transport,
-		Timeout:       httpClientTimeout * time.Second,
-		CheckRedirect: nil,
-		Jar:           nil,
-	}
-
-	return client
-}
-
-// OWASP: https://cheatsheetseries.owasp.org/cheatsheets/REST_Security_Cheat_Sheet.html
-func addSecureHeaders(writer *http.ResponseWriter) {
-	(*writer).Header().Set("Cache-Control", "no-store")
-	(*writer).Header().Set("Content-Security-Policy", "default-src https;")
-	(*writer).Header().Set("Strict-Transport-Security", "max-age=63072000;")
-	(*writer).Header().Set("X-Content-Type-Options", "nosniff")
-	(*writer).Header().Set("X-Frame-Options", "DENY")
-	(*writer).Header().Set("Access-Control-Allow-Methods", "GET,POST,PUT,DELETE,OPTIONS")
-}
-
-func getPriceFromCoinGecko(
-	ctx context.Context,
-	name, unit string,
-	wg *sync.WaitGroup,
-	priceChan chan<- priceChanStruct,
-	errChan chan<- errorChanStruct,
-) {
-	defer wg.Done()
-
-	priceFloat := 0.
-
-	params := "/simple/price?ids=" + url.QueryEscape(name) + "&" +
-		"vs_currencies=" + url.QueryEscape(unit)
-	path := coingeckoAPIURLv3 + params
-
-	client := GetProxiedClient()
-
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, path, nil)
-	if err != nil {
-		priceChan <- priceChanStruct{name: name, price: priceFloat}
-		errChan <- errorChanStruct{hasError: true, err: err}
-
-		log.Error().Err(err)
-
-		return
-	}
-
-	resp, err := client.Do(req)
-	if err != nil {
-		priceChan <- priceChanStruct{name: name, price: priceFloat}
-		errChan <- errorChanStruct{hasError: true, err: err}
-
-		log.Error().Err(err).Send()
-
-		return
-	}
-	defer resp.Body.Close()
-
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		priceChan <- priceChanStruct{name: name, price: priceFloat}
-		errChan <- errorChanStruct{hasError: true, err: err}
-
-		log.Error().Err(err).Send()
-	}
-
-	jsonBody := make(map[string]interface{})
-
-	err = json.Unmarshal(body, &jsonBody)
-	if err != nil {
-		priceChan <- priceChanStruct{name: name, price: priceFloat}
-		errChan <- errorChanStruct{hasError: true, err: err}
-
-		log.Error().Err(err).Send()
-	}
-
-	price, isOk := jsonBody[name].(map[string]interface{})
-	if !isOk {
-		priceChan <- priceChanStruct{name: name, price: priceFloat}
-		errChan <- errorChanStruct{hasError: true, err: err}
-
-		log.Error().Err(err)
-
-		return
-	}
-
-	log.Info().Msg(string(body))
-
-	priceFloat, isOk = price[unit].(float64)
-	if !isOk {
-		priceChan <- priceChanStruct{name: name, price: priceFloat}
-		errChan <- errorChanStruct{hasError: true, err: err}
-
-		log.Error().Err(err)
-
-		return
-	}
-
-	priceChan <- priceChanStruct{name: name, price: priceFloat}
-	errChan <- errorChanStruct{hasError: false, err: nil}
-}
-
-func getPriceFromCoinCap(
-	ctx context.Context,
-	name string,
-	wg *sync.WaitGroup,
-	priceChan chan<- priceChanStruct,
-	errChan chan<- errorChanStruct,
-) {
-	defer wg.Done()
-
-	priceFloat := 0.
-
-	params := "/assets/" + url.QueryEscape(name)
-	path := coincapAPIURLv2 + params
-
-	client := GetProxiedClient()
-
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, path, nil)
-	if err != nil {
-		priceChan <- priceChanStruct{name: name, price: priceFloat}
-		errChan <- errorChanStruct{hasError: true, err: err}
-
-		log.Error().Err(err)
-
-		return
-	}
-
-	resp, err := client.Do(req)
-	if err != nil {
-		priceChan <- priceChanStruct{name: name, price: priceFloat}
-		errChan <- errorChanStruct{hasError: true, err: err}
-
-		log.Error().Err(err).Send()
-
-		return
-	}
-	defer resp.Body.Close()
-
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		priceChan <- priceChanStruct{name: name, price: priceFloat}
-		errChan <- errorChanStruct{hasError: true, err: err}
-
-		log.Error().Err(err)
-	}
-
-	var coinCapAssetGetResponse CoinCapAssetGetResponse
-
-	err = json.Unmarshal(body, &coinCapAssetGetResponse)
-	if err != nil {
-		priceChan <- priceChanStruct{name: name, price: priceFloat}
-		errChan <- errorChanStruct{hasError: true, err: err}
-
-		log.Error().Err(err).Send()
-	}
-
-	priceFloat, err = strconv.ParseFloat(coinCapAssetGetResponse.Data.PriceUsd, 64)
-	if err != nil {
-		priceChan <- priceChanStruct{name: name, price: priceFloat}
-		errChan <- errorChanStruct{hasError: true, err: err}
-
-		log.Error().Err(err).Send()
-	}
-
-	log.Info().Msg(string(body))
-
-	priceChan <- priceChanStruct{name: name, price: priceFloat}
-	errChan <- errorChanStruct{hasError: false, err: nil}
-}
-
-func arbHandler(w http.ResponseWriter, r *http.Request) {
-	w.Header().Add("Content-Type", "application/json")
-
-	if r.Method != http.MethodGet {
-		http.Error(w, "Method is not supported.", http.StatusNotFound)
-	}
-
-	addSecureHeaders(&w)
-
-	var name string
-
-	var unit string
-
-	params := r.URL.Query()
-	for key, value := range params {
-		switch key {
-		case "name":
-			name = value[0]
-		case "unit":
-			unit = value[0]
-		default:
-			log.Error().Err(errUnexpectedParam)
-		}
-	}
-
-	priceChan := make(chan priceChanStruct, 1)
-	errChan := make(chan errorChanStruct, 1)
-
-	var waitGroup sync.WaitGroup
-
-	ctx, cancel := context.WithTimeout(context.Background(), getTimeout*time.Second)
-	defer cancel()
-
-	waitGroup.Add(1)
-
-	//nolint:contextcheck
-	getPriceFromCoinGecko(ctx, name, unit, &waitGroup, priceChan, errChan)
-	waitGroup.Wait()
-
-	select {
-	case err := <-errChan:
-		if err.hasError {
-			log.Error().Err(err.err)
-		}
-	default:
-		log.Error().Err(errBadLogic).Send()
-	}
-
-	var price priceChanStruct
-	select {
-	case priceCh := <-priceChan:
-		price = priceCh
-	default:
-		log.Error().Err(errBadLogic)
-	}
-
-	responseData := priceResponseData{
-		Name:         price.name,
-		Price:        price.price,
-		Unit:         "USD",
-		Err:          "",
-		IsSuccessful: true,
-	}
-
-	jsonResp, err := json.Marshal(responseData)
-	if err != nil {
-		cancel()
-		//nolint:gocritic
-		log.Fatal().Err(err)
-	}
-
-	_, err = w.Write(jsonResp)
-	if err != nil {
-		cancel()
-		log.Fatal().Err(err)
-	}
-}
-
-func coincapHandler(w http.ResponseWriter, r *http.Request) {
-	if r.Method != http.MethodGet {
-		http.Error(w, "Method is not supported.", http.StatusNotFound)
-	}
-
-	w.Header().Add("Content-Type", "application/json")
-
-	addSecureHeaders(&w)
-
-	var name string
-
-	params := r.URL.Query()
-	for key, value := range params {
-		switch key {
-		case "name":
-			name = value[0]
-		default:
-			log.Error().Err(errUnexpectedParam).Send()
-		}
-	}
-
-	priceChan := make(chan priceChanStruct, 1)
-	errChan := make(chan errorChanStruct, 1)
-
-	var waitGroup sync.WaitGroup
-
-	waitGroup.Add(1)
-
-	ctx, cancel := context.WithTimeout(context.Background(), getTimeout*time.Second)
-	defer cancel()
-
-	getPriceFromCoinCap(ctx, name, &waitGroup, priceChan, errChan)
-	waitGroup.Wait()
-
-	select {
-	case err := <-errChan:
-		if err.hasError {
-			log.Error().Err(err.err)
-		}
-	default:
-		log.Error().Err(errBadLogic)
-	}
-
-	var price priceChanStruct
-	select {
-	case priceCh := <-priceChan:
-		price = priceCh
-	default:
-		log.Error().Err(errBadLogic)
-	}
-
-	responseData := priceResponseData{
-		Name:         price.name,
-		Price:        price.price,
-		Unit:         "USD",
-		Err:          "",
-		IsSuccessful: true,
-	}
-
-	jsonResp, err := json.Marshal(responseData)
-	if err != nil {
-		cancel()
-
-		log.Fatal().Err(err).Send()
-	}
-
-	_, err = w.Write(jsonResp)
-	if err != nil {
-		cancel()
-		log.Fatal().Err(err)
-	}
-}
-
-func setupLogging() {
-	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
-}
-
-func startServer(gracefulWait time.Duration,
-	handlers []HTTPHandler,
-	serverDeploymentType string, port string,
-) {
-	route := mux.NewRouter()
-	cfg := &tls.Config{
-		MinVersion: tls.VersionTLS13,
-	}
-
-	srv := &http.Server{
-		Addr:         "0.0.0.0:" + port,
-		WriteTimeout: time.Second * serverTLSWriteTimeout,
-		ReadTimeout:  time.Second * serverTLSReadTimeout,
-		Handler:      route,
-		TLSConfig:    cfg,
-	}
-
-	for i := range len(handlers) {
-		route.HandleFunc(handlers[i].name, handlers[i].function)
-	}
-
-	go func() {
-		var certPath, keyPath string
-
-		switch os.Getenv(serverDeploymentType) {
-		case "deployment":
-			certPath = "/etc/letsencrypt/live/api.terminaldweller.com/fullchain.pem"
-			keyPath = "/etc/letsencrypt/live/api.terminaldweller.com/privkey.pem"
-		case "test":
-			certPath = "/certs/server.cert"
-			keyPath = "/certs/server.key"
-		default:
-			log.Error().Err(errUnknownDeployment).Send()
-		}
-
-		if err := srv.ListenAndServeTLS(certPath, keyPath); err != nil {
-			log.Error().Err(err)
-		}
-	}()
-
-	c := make(chan os.Signal, 1)
-
-	signal.Notify(c, os.Interrupt)
-	<-c
-
-	ctx, cancel := context.WithTimeout(context.Background(), gracefulWait)
-	defer cancel()
-
-	if err := srv.Shutdown(ctx); err != nil {
-		log.Error().Err(err)
-	}
-
-	log.Info().Msg("gracefully shut down the server")
-}
-
-func main() {
-	var gracefulWait time.Duration
-
-	var rdb *redis.Client
-
-	flag.DurationVar(
-		&gracefulWait,
-		"gracefulwait",
-		time.Second*defaultGracefulShutdown,
-		"the duration to wait during the graceful shutdown",
-	)
-
-	flagPort := flag.String("port", "8009", "determines the port the server will listen on")
-	redisDB := flag.Int64("redisdb", 1, "determines the db number")
-	redisAddress := flag.String("redisaddress", "redis:6379", "determines the address of the redis instance")
-	redisPassword := flag.String("redispassword", "", "determines the password of the redis db")
-	flag.Parse()
-
-	rdb = redis.NewClient(&redis.Options{
-		Addr:     *redisAddress,
-		Password: *redisPassword,
-		DB:       int(*redisDB),
-	})
-	defer rdb.Close()
-
-	setupLogging()
-
-	handlerFuncs := []HTTPHandler{
-		{name: "/crypto/v1/arb/gecko", function: arbHandler},
-		{name: "/crypto/v1/arb/coincap", function: coincapHandler},
-	}
-
-	startServer(gracefulWait, handlerFuncs, serverDeploymentType, *flagPort)
-}