Display general information about the state of upstream node

rpc/rpc.go

@@ -28,6 +28,7 @@ type RPCClient struct {
 	Name             string
 	sick             bool
 	client           *http.Client
+	info             atomic.Value
 }
 
 type GetBlockTemplateReply struct {
@@ -38,6 +39,14 @@ type GetBlockTemplateReply struct {
 	PrevHash       string `json:"prev_hash"`
 }
 
+type GetInfoReply struct {
+	IncomingConnections int64  `json:"incoming_connections_count"`
+	OutgoingConnections int64  `json:"outgoing_connections_count"`
+	Status              string `json:"status"`
+	Height              int64  `json:"height"`
+	TxPoolSize          int64  `json:"tx_pool_size"`
+}
+
 type JSONRpcResp struct {
 	Id     *json.RawMessage       `json:"id"`
 	Result *json.RawMessage       `json:"result"`
@@ -71,6 +80,19 @@ func (r *RPCClient) GetBlockTemplate(reserveSize int, address string) (*GetBlock
 	return reply, err
 }
 
+func (r *RPCClient) GetInfo() (*GetInfoReply, error) {
+	params := make(map[string]interface{})
+	rpcResp, err := r.doPost(r.Url.String(), "get_info", params)
+	var reply *GetInfoReply
+	if err != nil {
+		return nil, err
+	}
+	if rpcResp.Result != nil {
+		err = json.Unmarshal(*rpcResp.Result, &reply)
+	}
+	return reply, err
+}
+
 func (r *RPCClient) SubmitBlock(hash string) (*JSONRpcResp, error) {
 	return r.doPost(r.Url.String(), "submitblock", []string{hash})
 }
@@ -145,3 +167,16 @@ func (r *RPCClient) markAlive() {
 	}
 	r.Unlock()
 }
+
+func (r *RPCClient) UpdateInfo() (*GetInfoReply, error) {
+	info, err := r.GetInfo()
+	if err == nil {
+		r.info.Store(info)
+	}
+	return info, err
+}
+
+func (r *RPCClient) Info() *GetInfoReply {
+	reply, _ := r.info.Load().(*GetInfoReply)
+	return reply
+}

stratum/api.go

@@ -58,6 +58,7 @@ func convertUpstream(u *rpc.RPCClient) map[string]interface{} {
 		"rejects":          atomic.LoadInt64(&u.Rejects),
 		"lastSubmissionAt": atomic.LoadInt64(&u.LastSubmissionAt),
 		"failsCount":       atomic.LoadInt64(&u.FailsCount),
+		"info":             u.Info(),
 	}
 	return upstream
 }

stratum/stratum.go

@@ -100,6 +100,9 @@ func NewStratum(cfg *pool.Config) *StratumServer {
 	checkIntv, _ := time.ParseDuration(cfg.UpstreamCheckInterval)
 	checkTimer := time.NewTimer(checkIntv)
 
+	infoIntv, _ := time.ParseDuration(cfg.UpstreamCheckInterval)
+	infoTimer := time.NewTimer(infoIntv)
+
 	// Init block template
 	go stratum.refreshBlockTemplate(false)
 
@@ -123,6 +126,32 @@ func NewStratum(cfg *pool.Config) *StratumServer {
 		}
 	}()
 
+	go func() {
+		for {
+			select {
+			case <-infoTimer.C:
+				poll := func(v *rpc.RPCClient) {
+					_, err := v.UpdateInfo()
+					if err != nil {
+						log.Printf("Unable to update info on upstream %s: %v", v.Name, err)
+					}
+				}
+				current := stratum.rpc()
+				poll(current)
+
+				// Async rpc call to not block on rpc timeout, ignoring current
+				go func() {
+					for _, v := range stratum.upstreams {
+						if v != current {
+							poll(v)
+						}
+					}
+				}()
+				infoTimer.Reset(infoIntv)
+			}
+		}
+	}()
+
 	return stratum
 }
 

www/index.html

@@ -70,7 +70,7 @@
         </div>
         <div class="col-xs-12">
           <h4>Upstream</h4>
-          <table class="table table-condensed">
+          <table class="table table-condensed table-striped">
             <tr>
             <th>Name</th>
             <th>Url</th>
@@ -93,7 +93,17 @@
               <td>{{formatNumber accepts}}</td>
               <td><strong>{{formatNumber rejects}}</strong></td>
               <td>{{failsCount}}</td>
+              {{#if info}}
+              <tr>
+                <td colspan="5" class="small">
+                  <strong>Status:</strong> <span class="label label-default">{{info.status}}</span>
+                  <strong>Height:</strong> <span class="label label-default">{{info.height}}</span>
+                  <strong>Tx Pool Size:</strong> <span class="label label-default">{{info.tx_pool_size}}</span>
+                  <strong>In:</strong> <span class="label label-default">{{info.incoming_connections_count}}</span>
+                  <strong>Out:</strong> <span class="label label-default">{{info.outgoing_connections_count}}</span>
+                </td>
               </tr>
+              {{/if}}
             {{/each}}
           </table>
         </div>