Priceupdater-v0 (#23)

* First price-updater implementation

* Lint corrections

* Structs revision

* Read Write Mutex

* Review price updater and apply small changes

Co-authored-by: Toni Ramírez <toni@iden3.com>
Co-authored-by: Eduard S <eduard@iden3.io>

priceupdater/priceupdater_test.go

@@ -0,0 +1,40 @@
+package priceupdater
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCon(t *testing.T) {
+
+	config := ConfigPriceUpdater{
+
+		RecommendedFee:              1,
+		RecommendedCreateAccountFee: 1,
+		TokensList:                  []string{"ETH", "NEC"},
+		APIURL:                      "https://api-pub.bitfinex.com/v2/",
+	}
+
+	pud := NewPriceUpdater(config)
+
+	err := pud.UpdatePrices()
+	assert.Equal(t, err, nil)
+
+	info, _ := pud.Get("ETH")
+	assert.NotZero(t, info.Value)
+
+	info2, _ := pud.Get("NEC")
+	assert.NotZero(t, info2.Value)
+
+	info3, err := pud.Get("INVENTED")
+	if assert.Error(t, err) {
+		assert.Equal(t, ErrSymbolDoesNotExistInDatabase, err)
+	}
+	assert.Equal(t, info3.Value, float64(0))
+
+	prices := pud.GetPrices()
+	assert.Equal(t, prices["ETH"], info)
+	assert.Equal(t, prices["NEC"], info2)
+
+}