From c0024dd75c31277fe47d10cfbd78db805c879428 Mon Sep 17 00:00:00 2001
From: Ferran Borreguero <ferranbt@protonmail.com>
Date: Thu, 7 Apr 2022 09:29:22 +0400
Subject: [PATCH] Add etherscan gas price (#182)

* Add etherscan gas price

* Update Changelog
---
 CHANGELOG.md                             |  1 +
 etherscan/etherscan.go                   | 14 ++++++++++++++
 etherscan/etherscan_test.go              |  8 ++++++++
 website/pages/integrations/etherscan.mdx |  8 ++++++++
 4 files changed, 31 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 23675d30..608f504b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 
 # 0.1.1 (Not released)
 
+- Add `etherscan.GasPrice` function to return last block gas price [[GH-182](https://github.com/umbracle/ethgo/issues/182)]
 - Add `4byte` package and cli [[GH-178](https://github.com/umbracle/ethgo/issues/178)]
 - Install and use `ethers.js` spec tests for wallet private key decoding [[GH-177](https://github.com/umbracle/ethgo/issues/177)]
 - Add `GetLogs` function Etherscan to return logs by filter [[GH-170](https://github.com/umbracle/ethgo/issues/170)]
diff --git a/etherscan/etherscan.go b/etherscan/etherscan.go
index 2f159f33..13086b4a 100644
--- a/etherscan/etherscan.go
+++ b/etherscan/etherscan.go
@@ -148,6 +148,20 @@ func (e *Etherscan) GetContractCode(addr ethgo.Address) (*ContractCode, error) {
 	return out[0], nil
 }
 
+func (e *Etherscan) GasPrice() (uint64, error) {
+	var out struct {
+		LastBlock string `json:"LastBlock"`
+	}
+	if err := e.Query("gastracker", "gasoracle", &out, map[string]string{}); err != nil {
+		return 0, err
+	}
+	num, err := strconv.Atoi(out.LastBlock)
+	if err != nil {
+		return 0, err
+	}
+	return uint64(num), nil
+}
+
 func (e *Etherscan) GetLogs(filter *ethgo.LogFilter) ([]*ethgo.Log, error) {
 	if len(filter.Address) == 0 {
 		return nil, fmt.Errorf("an address to filter is required")
diff --git a/etherscan/etherscan_test.go b/etherscan/etherscan_test.go
index a8d1762e..fa5c1e09 100644
--- a/etherscan/etherscan_test.go
+++ b/etherscan/etherscan_test.go
@@ -56,3 +56,11 @@ func TestGetLogs(t *testing.T) {
 	assert.NoError(t, err)
 	assert.NotEmpty(t, logs)
 }
+
+func TestGasPrice(t *testing.T) {
+	e := testEtherscanMainnet(t)
+
+	gas, err := e.GasPrice()
+	assert.NoError(t, err)
+	assert.NotZero(t, gas)
+}
diff --git a/website/pages/integrations/etherscan.mdx b/website/pages/integrations/etherscan.mdx
index 0da8ff4e..b95d436d 100644
--- a/website/pages/integrations/etherscan.mdx
+++ b/website/pages/integrations/etherscan.mdx
@@ -94,3 +94,11 @@ Input:
 Output:
 
 - `logs` <Log text="[]Log"/>: List of logs that match the filter.
+
+## GasPrice
+
+<GoDocLink href="etherscan#Etherscan.GasPrice">GasPrice</GoDocLink> returns the gas price of the latest block.
+
+Output:
+
+- `gasPrice` (`uint64`): Gas price of the latest block.