From 07a8dff4fa6a18aca60fd83cea165400239f7ca6 Mon Sep 17 00:00:00 2001
From: Pengfei Ni <peni@microsoft.com>
Date: Tue, 21 Nov 2017 07:13:42 +0000
Subject: [PATCH] Add utils for vmss typed instances

---
 .../providers/azure/azure_util_vmss.go        | 102 ++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 pkg/cloudprovider/providers/azure/azure_util_vmss.go

diff --git a/pkg/cloudprovider/providers/azure/azure_util_vmss.go b/pkg/cloudprovider/providers/azure/azure_util_vmss.go
new file mode 100644
index 00000000000..e16e3173552
--- /dev/null
+++ b/pkg/cloudprovider/providers/azure/azure_util_vmss.go
@@ -0,0 +1,102 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package azure
+
+import (
+	"fmt"
+	"strconv"
+
+	"github.com/Azure/azure-sdk-for-go/arm/compute"
+	"github.com/golang/glog"
+
+	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/kubernetes/pkg/cloudprovider"
+)
+
+func (az *Cloud) getIPForVmssMachine(nodeName types.NodeName) (string, error) {
+	az.operationPollRateLimiter.Accept()
+	machine, exists, err := az.getVmssVirtualMachine(nodeName)
+	if !exists {
+		return "", cloudprovider.InstanceNotFound
+	}
+	if err != nil {
+		glog.Errorf("error: az.getIPForVmssMachine(%s), az.getVmssVirtualMachine(%s), err=%v", nodeName, nodeName, err)
+		return "", err
+	}
+
+	nicID, err := getPrimaryInterfaceIDForVmssMachine(machine)
+	if err != nil {
+		glog.Errorf("error: az.getIPForVmssMachine(%s), getPrimaryInterfaceID(%v), err=%v", nodeName, machine, err)
+		return "", err
+	}
+
+	nicName, err := getLastSegment(nicID)
+	if err != nil {
+		glog.Errorf("error: az.getIPForVmssMachine(%s), getLastSegment(%s), err=%v", nodeName, nicID, err)
+		return "", err
+	}
+
+	az.operationPollRateLimiter.Accept()
+	glog.V(10).Infof("InterfacesClient.Get(%q): start", nicName)
+	nic, err := az.InterfacesClient.GetVirtualMachineScaleSetNetworkInterface(az.ResourceGroup, az.Config.PrimaryScaleSetName, *machine.InstanceID, nicName, "")
+	glog.V(10).Infof("InterfacesClient.Get(%q): end", nicName)
+	if err != nil {
+		glog.Errorf("error: az.getIPForVmssMachine(%s), az.GetVirtualMachineScaleSetNetworkInterface.Get(%s, %s, %s), err=%v", nodeName, az.ResourceGroup, nicName, "", err)
+		return "", err
+	}
+
+	ipConfig, err := getPrimaryIPConfig(nic)
+	if err != nil {
+		glog.Errorf("error: az.getIPForVmssMachine(%s), getPrimaryIPConfig(%v), err=%v", nodeName, nic, err)
+		return "", err
+	}
+
+	targetIP := *ipConfig.PrivateIPAddress
+	return targetIP, nil
+}
+
+// This returns the full identifier of the primary NIC for the given VM.
+func getPrimaryInterfaceIDForVmssMachine(machine compute.VirtualMachineScaleSetVM) (string, error) {
+	if len(*machine.NetworkProfile.NetworkInterfaces) == 1 {
+		return *(*machine.NetworkProfile.NetworkInterfaces)[0].ID, nil
+	}
+
+	for _, ref := range *machine.NetworkProfile.NetworkInterfaces {
+		if *ref.Primary {
+			return *ref.ID, nil
+		}
+	}
+
+	return "", fmt.Errorf("failed to find a primary nic for the vm. vmname=%q", *machine.Name)
+}
+
+// machineName is composed of computerNamePrefix and 36-based instanceID.
+// And instanceID part if in fixed length of 6 characters.
+// Refer https://msftstack.wordpress.com/2017/05/10/figuring-out-azure-vm-scale-set-machine-names/.
+func getVmssInstanceID(machineName string) (string, error) {
+	nameLength := len(machineName)
+	if nameLength < 6 {
+		return "", ErrorNotVmssInstance
+	}
+
+	instanceID, err := strconv.ParseUint(machineName[nameLength-6:], 36, 64)
+	if err != nil {
+		return "", ErrorNotVmssInstance
+	}
+
+	return fmt.Sprintf("%d", instanceID), nil
+}