implemented estimatesmartfee method

bchain/coins/bch/bcashrpc.go

@@ -81,6 +81,23 @@ type resGetBlockThin struct {
 	Result bchain.ThinBlock `json:"result"`
 }
 
+// estimatesmartfee
+
+type cmdEstimateSmartFee struct {
+	Method string `json:"method"`
+	Params struct {
+		Blocks int `json:"nblocks"`
+	} `json:"params"`
+}
+
+type resEstimateSmartFee struct {
+	Error  *bchain.RPCError `json:"error"`
+	Result struct {
+		Feerate float64 `json:"feerate"`
+		Blocks  int     `json:"blocks"`
+	} `json:"result"`
+}
+
 // GetBlock returns block with given hash.
 func (b *BCashRPC) GetBlock(hash string, height uint32) (*bchain.Block, error) {
 	var err error
@@ -174,6 +191,25 @@ func (b *BCashRPC) GetBlockFull(hash string) (*bchain.Block, error) {
 	return nil, errors.New("Not implemented")
 }
 
+// EstimateSmartFee returns fee estimation.
+func (b *BCashRPC) EstimateSmartFee(blocks int, conservative bool) (float64, error) {
+	glog.V(1).Info("rpc: estimatesmartfee ", blocks)
+
+	res := resEstimateSmartFee{}
+	req := cmdEstimateSmartFee{Method: "estimatesmartfee"}
+	req.Params.Blocks = blocks
+	// conservative param is omitted
+	err := b.Call(&req, &res)
+
+	if err != nil {
+		return 0, err
+	}
+	if res.Error != nil {
+		return 0, res.Error
+	}
+	return res.Result.Feerate, nil
+}
+
 func isErrBlockNotFound(err *bchain.RPCError) bool {
 	return err.Message == "Block not found" ||
 		err.Message == "Block height out of range"

static/test.html

@@ -141,6 +141,21 @@
             return socket.send({ method, params }, f);
         }
 
+        function estimateFee() {
+            var blocks = document.getElementById('estimateFeeBlocks').value.trim();
+            estimateTxFee(parseInt(blocks), function (result) {
+                console.log('estimateFee sent successfully');
+                console.log(result);
+                document.getElementById('estimateFeeResult').innerText = JSON.stringify(result).replace(/,/g, ", ");
+            });
+        }
+
+        function estimateTxFee(blocks, f) {
+            const method = 'estimateFee';
+            const params = [blocks];
+            return socket.send({ method, params }, f);
+        }
+
         function getInfo() {
             lookupSyncStatus(function (result) {
                 console.log('getInfo sent successfully');
@@ -324,6 +339,19 @@
             <div class="col" id="estimateSmartFeeResult">
             </div>
         </div>
+        <div class="row">
+            <div class="col">
+                <input class="btn btn-secondary" type="button" value="estimateFee" onclick="estimateFee()">
+            </div>
+            <div class="col-8">
+                <input type="text" class="form-control" id="estimateFeeBlocks" value="20">
+            </div>
+            <div class="col"></div>
+        </div>
+        <div class="row">
+            <div class="col" id="estimateFeeResult">
+            </div>
+        </div>
         <div class="row">
             <div class="col">
                 <input class="btn btn-secondary" type="button" value="getInfo" onclick="getInfo()">