metrics: add pending tx and peer count

internal/server/handlers.go

@@ -18,8 +18,18 @@ type (
 	}
 
 	BatchMetricsResponse struct {
-		GasPrice    uint64
-		BlockNumber uint64
+		GasPrice       uint64
+		BlockNumber    uint64
+		PeerCount      uint64
+		PendingTx      []pendingTx
+		PendingTxCount int
+		Enode          string
+	}
+
+	pendingTx struct {
+		Hash string `json:"hash"`
+		From string `json:"from"`
+		To   string `json:"to"`
 	}
 )
 
@@ -68,6 +78,9 @@ func batchMetricsCall() (bool, BatchMetricsResponse) {
 		// The rpc call id here is guranteed to be in order of appearance starting from index 0
 		jsonrpc.NewRequest("eth_gasPrice"),
 		jsonrpc.NewRequest("eth_blockNumber"),
+		jsonrpc.NewRequest("net_peerCount"),
+		jsonrpc.NewRequest("parity_pendingTransactions"),
+		jsonrpc.NewRequest("parity_enode"),
 	})
 
 	if err != nil {
@@ -97,5 +110,31 @@ func batchMetricsCall() (bool, BatchMetricsResponse) {
 		batchResponse.BlockNumber = util.Hex2Int(val)
 	}
 
+	if peerCount, ok := rpcResponses[2]; ok {
+		val, err := peerCount.GetString()
+		if err != nil {
+			return false, batchResponse
+		}
+		batchResponse.PeerCount = util.Hex2Int(val)
+	}
+
+	if pendingTransactionsArray, ok := rpcResponses[3]; ok {
+		var pendingTransactions = []pendingTx{}
+		err := pendingTransactionsArray.GetObject(&pendingTransactions)
+		if err != nil {
+			return false, batchResponse
+		}
+		batchResponse.PendingTxCount = len(pendingTransactions)
+		batchResponse.PendingTx = pendingTransactions
+	}
+
+	if enode, ok := rpcResponses[4]; ok {
+		val, err := enode.GetString()
+		if err != nil {
+			return false, batchResponse
+		}
+		batchResponse.Enode = val
+	}
+
 	return true, batchResponse
 }

internal/server/router.go

@@ -23,7 +23,7 @@ func healthHandler(c *gin.Context) {
 
 	if !allOk {
 		// choose a better status code if available
-		c.JSON(http.StatusExpectationFailed, gin.H{
+		c.JSON(http.StatusServiceUnavailable, gin.H{
 			"message": "could not get node health status",
 		})
 		return
@@ -40,14 +40,18 @@ func metricsHandler(c *gin.Context) {
 
 	if !allOk {
 		// choose a better status code if available
-		c.JSON(http.StatusExpectationFailed, gin.H{
+		c.JSON(http.StatusServiceUnavailable, gin.H{
 			"message": "could not get node metrics",
 		})
 		return
 	}
 
 	c.JSON(http.StatusOK, gin.H{
-		"gasPrice":    data.GasPrice,
-		"blockNumber": data.BlockNumber,
+		"gasPrice":                 data.GasPrice,
+		"blockNumber":              data.BlockNumber,
+		"peerCount":                data.PeerCount,
+		"pendingTransactionsCount": data.PendingTxCount,
+		"pendingTransactions":      data.PendingTx,
+		"enode":                    data.Enode,
 	})
 }