cmc ping

README.md

@@ -503,6 +503,14 @@ Action|Description
 
   - A: Press <kbd>q</kbd> to quit the open view/window.
 
+- Q: I'm getting the error `open /dev/tty: no such device or address`.
+
+    -A: Usually this error occurs when cointop is running as a daemon or slave which means that there is no terminal allocated, so `/dev/tty` doesn't exist for that process. Try running it with the following environment variables:
+
+    ```bash
+    DEV_IN=/dev/stdout DEV_OUT=/dev/stdin cointop
+    ```
+
 ## Development
 
 ### Go

cointop/cointop.go

@@ -69,16 +69,13 @@ type Cointop struct {
 	convertmenuvisible  bool
 }
 
-// Instance running cointop instance
-var Instance *Cointop
-
-// Run runs cointop
-func Run() {
+// New initializes cointop
+func New() *Cointop {
 	var debug bool
 	if os.Getenv("DEBUG") != "" {
 		debug = true
 	}
-	ct := Cointop{
+	ct := &Cointop{
 		api:               api.NewCMC(),
 		refreshticker:     time.NewTicker(1 * time.Minute),
 		sortby:            "rank",
@@ -142,7 +139,6 @@ func Run() {
 		convertmenuviewname: "convertmenu",
 		currencyconversion:  "USD",
 	}
-	Instance = &ct
 	err := ct.setupConfig()
 	if err != nil {
 		log.Fatal(err)
@@ -162,7 +158,15 @@ func Run() {
 	marketcachekey := "market"
 	fcache.Get(marketcachekey, &market)
 	ct.cache.Set(marketcachekey, market, 10*time.Second)
+	err = ct.api.Ping()
+	if err != nil {
+		log.Fatal(err)
+	}
+	return ct
+}
 
+// Run runs cointop
+func (ct *Cointop) Run() {
 	g, err := gocui.NewGui(gocui.Output256)
 	if err != nil {
 		log.Fatalf("new gocui: %v", err)
@@ -195,8 +199,10 @@ func (ct *Cointop) quitView() error {
 }
 
 // Exit safely exit application
-func Exit() {
-	if Instance != nil {
-		Instance.g.Close()
+func (ct *Cointop) Exit() {
+	if ct.g != nil {
+		ct.g.Close()
+	} else {
+		os.Exit(0)
 	}
 }

main.go

@@ -3,7 +3,6 @@ package main
 import (
 	"flag"
 	"fmt"
-	"time"
 
 	"github.com/miguelmota/cointop/cointop"
 )
@@ -11,27 +10,19 @@ import (
 var version = "1.0.1"
 
 func main() {
-	var ver bool
+	var ver, test bool
 	flag.BoolVar(&ver, "v", false, "Version")
-	var test bool
 	flag.BoolVar(&test, "test", false, "Run test")
 	flag.Parse()
 	if ver {
 		fmt.Println(version)
-		return
+	} else if test {
+		doTest()
+	} else {
+		cointop.New().Run()
 	}
-	if test {
-		runTest()
-		return
-	}
-
-	cointop.Run()
 }
 
-func runTest() {
-	go func() {
-		cointop.Run()
-	}()
-	time.Sleep(1 * time.Second)
-	cointop.Exit()
+func doTest() {
+	cointop.New().Exit()
 }

pkg/api/impl/coinmarketcap/coinmarketcap.go

@@ -1,6 +1,7 @@
 package coinmarketcap
 
 import (
+	"errors"
 	"fmt"
 	"strconv"
 	"strings"
@@ -19,6 +20,20 @@ func New() *Service {
 	return &Service{}
 }
 
+// Ping ping API
+func (s *Service) Ping() error {
+	ticker, err := cmc.Ticker(&cmc.TickerOptions{
+		Symbol: "ETH",
+	})
+	if err != nil {
+		return errors.New("failed to ping")
+	}
+	if ticker == nil {
+		return errors.New("failed to ping")
+	}
+	return nil
+}
+
 func getLimitedCoinData(convert string, offset int) (map[string]apitypes.Coin, error) {
 	ret := make(map[string]apitypes.Coin)
 	max := 100

pkg/api/interface.go

@@ -6,6 +6,7 @@ import (
 
 // Interface interface
 type Interface interface {
+	Ping() error
 	GetAllCoinData(convert string) (map[string]types.Coin, error)
 	GetCoinGraphData(coin string, start int64, end int64) (types.CoinGraph, error)
 	GetGlobalMarketGraphData(start int64, end int64) (types.MarketGraph, error)