[dev] stats module

Author: nanmu42

response.go

@@ -128,3 +128,11 @@ type BlockRewards struct {
 	} `json:"uncles"`
 	UncleInclusionReward *BigInt `json:"uncleInclusionReward"`
 }
+
+// LatestPrice holds info from query for latest ether price
+type LatestPrice struct {
+	ETHBTC          float64 `json:"ethbtc,string"`
+	ETHBTCTimestamp Time    `json:"ethbtc_timestamp"`
+	ETHUSD          float64 `json:"ethusd,string"`
+	ETHUSDTimestamp Time    `json:"ethusd_timestamp"`
+}

stat.go

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2018 LI Zhennan
+ *
+ * Use of this work is governed by a MIT License.
+ * You may find a license copy in project root.
+ */
+
+package etherscan
+
+// EtherTotalSupply gets total supply of ether
+func (c *Client) EtherTotalSupply() (totalSupply *BigInt, err error) {
+	err = c.call("stats", "ethsupply", nil, &totalSupply)
+	return
+}
+
+// EtherLatestPrice gets the latest ether price, in BTC and USD
+func (c *Client) EtherLatestPrice() (price LatestPrice, err error) {
+	err = c.call("stats", "ethprice", nil, &price)
+	return
+}

stat_test.go

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2018 LI Zhennan
+ *
+ * Use of this work is governed by a MIT License.
+ * You may find a license copy in project root.
+ */
+
+package etherscan
+
+import (
+	"math/big"
+	"testing"
+)
+
+func TestClient_EtherTotalSupply(t *testing.T) {
+	totalSupply, err := api.EtherTotalSupply()
+	noError(t, err, "api.EtherTotalSupply")
+
+	if totalSupply.Int().Cmp(big.NewInt(100)) != 1 {
+		t.Errorf("api.EtherTotalSupply not working, totalSupply is %s", totalSupply.Int().String())
+	}
+}
+
+func TestClient_EtherLatestPrice(t *testing.T) {
+	latest, err := api.EtherLatestPrice()
+	noError(t, err, "api.EtherLatestPrice")
+
+	if latest.ETHBTC == 0 {
+		t.Errorf("ETHBTC got 0")
+	}
+	if latest.ETHBTCTimestamp.Time().IsZero() {
+		t.Errorf("ETHBTCTimestamp is zero")
+	}
+	if latest.ETHUSD == 0 {
+		t.Errorf("ETHUSD got 0")
+	}
+	if latest.ETHUSDTimestamp.Time().IsZero() {
+		t.Errorf("ETHUSDTimestamp is zero")
+	}
+}