Added support for querying log events based on one topic

Author: avislash

logs.go

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2022 Avi Misra
+ *
+ * Use of this work is governed by a MIT License.
+ * You may find a license copy in project root.
+ */
+
+package etherscan
+
+// GetLogs gets logs that match "topic" emitted by the specified "address" between the "fromBlock" and "toBlock"
+func (c *Client) GetLogs(fromBlock, toBlock int, address, topic string) (logs []Log, err error) {
+	param := M{
+		"fromBlock": fromBlock,
+		"toBlock":   toBlock,
+		"topic0":    topic,
+		"address":   address,
+	}
+
+	err = c.call("logs", "getLogs", param, &logs)
+	return
+}

logs_e2e_test.go

@@ -0,0 +1,34 @@
+package etherscan
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func TestClient_GetLogs(t *testing.T) {
+	const ans = `[{"address":"0x33990122638b9132ca29c723bdf037f1a891a70c","topics":[],"data":"0x","blockNumber":"0x5c958","logIndex":"0x","blockHash":"","transactionHash":"0x0b03498648ae2da924f961dda00dc6bb0a8df15519262b7e012b7d67f4bb7e83", "removed":false}]`
+	expectedLogs := []Log{
+		Log{
+			Address:         "0x33990122638b9132ca29c723bdf037f1a891a70c",
+			Topics:          []string{"0xf63780e752c6a54a94fc52715dbc5518a3b4c3c2833d301a204226548a2a8545", "0x72657075746174696f6e00000000000000000000000000000000000000000000", "0x000000000000000000000000d9b2f59f3b5c7b3c67047d2f03c3e8052470be92"},
+			Data:            "0x",
+			BlockNumber:     "0x5c958",
+			TransactionHash: "0x0b03498648ae2da924f961dda00dc6bb0a8df15519262b7e012b7d67f4bb7e83",
+			LogIndex:        "0x",
+		},
+	}
+
+	actualLogs, err := api.GetLogs(379224, 379225, "0x33990122638b9132ca29c723bdf037f1a891a70c", "0xf63780e752c6a54a94fc52715dbc5518a3b4c3c2833d301a204226548a2a8545")
+
+	noError(t, err, "api.GetLogs")
+
+	var expected []map[string]interface{}
+	var actual []map[string]interface{}
+
+	equal := cmp.Equal(expectedLogs, actualLogs)
+
+	if !equal {
+		t.Errorf("api.GetLogs not working\n: %s\n", cmp.Diff(expected, actual))
+	}
+}