Get eth block by height

bchain/coins/eth/ethrpc.go

@@ -284,7 +284,13 @@ func (b *EthRPC) GetBlock(hash string, height uint32) (*bchain.Block, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), b.timeout)
 	defer cancel()
 	var raw json.RawMessage
-	err := b.rpc.CallContext(ctx, &raw, "eth_getBlockByHash", ethcommon.HexToHash(hash), true)
+	var err error
+	if hash != "" {
+		err = b.rpc.CallContext(ctx, &raw, "eth_getBlockByHash", ethcommon.HexToHash(hash), true)
+	} else {
+
+		err = b.rpc.CallContext(ctx, &raw, "eth_getBlockByNumber", fmt.Sprintf("%#x", height), true)
+	}
 	if err != nil {
 		return nil, err
 	} else if len(raw) == 0 {

bchain/coins/eth/ethrpc_test.go

@@ -244,7 +244,7 @@ func TestEthRPC_GetBlock(t *testing.T) {
 		wantErr     bool
 	}{
 		{
-			name: "2870000",
+			name: "2870000 by hash",
 			fields: fields{
 				b: setupEthRPC(),
 			},
@@ -260,6 +260,23 @@ func TestEthRPC_GetBlock(t *testing.T) {
 			},
 			wantTxCount: 12,
 		},
+		{
+			name: "2870000 by height",
+			fields: fields{
+				b: setupEthRPC(),
+			},
+			args: args{
+				height: 2870000,
+			},
+			want: &bchain.Block{
+				BlockHeader: bchain.BlockHeader{
+					Hash:          "eccd6b0031015a19cb7d4e10f28590ba65a6a54ad1baa322b50fe5ad16903895",
+					Height:        2870000,
+					Confirmations: int(uint32(bh.Number.Uint64()) - 2870000),
+				},
+			},
+			wantTxCount: 12,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {