fix incorrect gasstation price (#639)

* fix incorrect gasstation price

* add helping comment

* make go tests run no parallel

Makefile

@@ -77,11 +77,11 @@ install-subkey:
 ## Runs go test for all packages except the solidity bindings
 test:
 	@echo "  >  \033[32mRunning tests...\033[0m "
-	go test -coverprofile=cover.out -v `go list ./... | grep -v bindings | grep -v e2e`
+	go test -p 1 -coverprofile=cover.out -v `go list ./... | grep -v bindings | grep -v e2e`
 
 test-e2e:
 	@echo "  >  \033[32mRunning e2e tests...\033[0m "
-	go test -v -timeout 0 ./e2e
+	go test -p 1 -v -timeout 0 ./e2e
 
 test-eth:
 	@echo "  >  \033[32mRunning ethereum tests...\033[0m "

connections/ethereum/egs/egs.go

@@ -89,14 +89,17 @@ func queryAPI(url string) (*gasPriceResponse, error) {
 }
 
 func parsePrice(result *gasPriceResponse, speed string) *big.Int {
+	var res *big.Int
 	switch speed {
 	case Fastest:
-		return big.NewInt(result.Fastest)
+		res = big.NewInt(result.Fastest)
 	case Fast:
-		return big.NewInt(result.Fast)
+		res = big.NewInt(result.Fast)
 	case Average:
-		return big.NewInt(result.Average)
+		res = big.NewInt(result.Average)
 	default:
-		return big.NewInt(result.Fast)
+		res = big.NewInt(result.Fast)
 	}
+	base := big.NewInt(8) // we are using 8 here but not 9 bcs ethgas station returns values in Gwei * 10
+	return res.Mul(res, big.NewInt(0).Exp(big.NewInt(10), base, nil))
 }

connections/ethereum/egs/egs_test.go

@@ -23,9 +23,9 @@ var exampleResponse = &gasPriceResponse{
 var rawResponse = "{\"fast\":590,\"fastest\":700,\"safeLow\":490,\"average\":500,\"block_time\":15.9,\"blockNum\":12389059,\"speed\":0.995538884040233,\"safeLowWait\":13.6,\"avgWait\":2.1,\"fastWait\":0.9,\"fastestWait\":0.6,\"gasPriceRange\":{\"4\":265,\"6\":265,\"8\":265,\"10\":265,\"20\":265,\"30\":265,\"40\":265,\"50\":265,\"60\":265,\"70\":265,\"80\":265,\"90\":265,\"100\":265,\"110\":265,\"120\":265,\"130\":265,\"140\":265,\"150\":265,\"160\":265,\"170\":265,\"180\":265,\"190\":265,\"200\":265,\"220\":265,\"240\":265,\"260\":265,\"280\":265,\"300\":265,\"320\":265,\"340\":265,\"360\":265,\"380\":265,\"400\":265,\"420\":265,\"440\":265,\"460\":265,\"480\":15,\"490\":13.6,\"500\":2.1,\"520\":1.7,\"540\":1.2,\"560\":1,\"580\":0.9,\"590\":0.9,\"600\":0.8,\"620\":0.7,\"640\":0.7,\"660\":0.7,\"680\":0.7,\"700\":0.6}}"
 
 func TestParsePrice(t *testing.T) {
-	assert.Equal(t, parsePrice(exampleResponse, Fastest), big.NewInt(exampleResponse.Fastest))
-	assert.Equal(t, parsePrice(exampleResponse, Fast), big.NewInt(exampleResponse.Fast))
-	assert.Equal(t, parsePrice(exampleResponse, Average), big.NewInt(exampleResponse.Average))
+	assert.Equal(t, parsePrice(exampleResponse, Fastest), big.NewInt(200000000))
+	assert.Equal(t, parsePrice(exampleResponse, Fast), big.NewInt(100000000))
+	assert.Equal(t, parsePrice(exampleResponse, Average), big.NewInt(400000000))
 }
 
 func TestFetchPrice(t *testing.T) {
@@ -48,5 +48,5 @@ func TestFetchPrice(t *testing.T) {
 	}
 
 	assert.Equal(t, *res, expected)
-	assert.Equal(t, parsePrice(res, Fastest), big.NewInt(700))
+	assert.Equal(t, parsePrice(res, Fastest), big.NewInt(70000000000))
 }