add func to get only a subset of stats

Author: Alex Shchukin

client/nginx.go

@@ -1020,6 +1020,60 @@ func (client *NginxClient) GetStats() (*Stats, error) {
 	}, nil
 }
 
+// GetSubStats gets a subset of GetStats() stats from the NGINX Plus API.
+func (client *NginxClient) GetSubStats() (*Stats, error) {
+	info, err := client.getNginxInfo()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get stats: %v", err)
+	}
+
+	processes, err := client.getProcesses()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get stats: %v", err)
+	}
+
+	slabs, err := client.getSlabs()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get stats: %v", err)
+	}
+
+	cons, err := client.getConnections()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get stats: %v", err)
+	}
+
+	requests, err := client.getHTTPRequests()
+	if err != nil {
+		return nil, fmt.Errorf("Failed to get stats: %v", err)
+	}
+
+	ssl, err := client.getSSL()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get stats: %v", err)
+	}
+
+	zones, err := client.getServerZones()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get stats: %v", err)
+	}
+
+	upstreams, err := client.getUpstreams()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get stats: %v", err)
+	}
+
+	return &Stats{
+		NginxInfo:    *info,
+		Processes:    *processes,
+		Slabs:        *slabs,
+		Connections:  *cons,
+		HTTPRequests: *requests,
+		SSL:          *ssl,
+		ServerZones:  *zones,
+		Upstreams:    *upstreams,
+	}, nil
+}
+
 func (client *NginxClient) getNginxInfo() (*NginxInfo, error) {
 	var info NginxInfo
 	err := client.get("nginx", &info)