add Azure storage and blob service API to support Azure disk dynamic provisioning

Signed-off-by: Huamin Chen <hchen@redhat.com>

pkg/cloudprovider/providers/azure/azure_blob.go

@@ -0,0 +1,99 @@
+/*
+Copyright 2016 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"
+	"regexp"
+
+	azs "github.com/Azure/azure-sdk-for-go/storage"
+)
+
+const (
+	vhdContainerName = "vhds"
+	useHTTPS         = true
+	blobServiceName  = "blob"
+)
+
+// create page blob
+func (az *Cloud) createVhdBlob(accountName, accountKey, name string, sizeGB int64, tags map[string]string) (string, string, error) {
+	blobClient, err := az.getBlobClient(accountName, accountKey)
+	if err != nil {
+		return "", "", err
+	}
+	size := 1024 * 1024 * 1024 * sizeGB
+	vhdSize := size + vhdHeaderSize /* header size */
+	// Blob name in URL must end with '.vhd' extension.
+	name = name + ".vhd"
+	err = blobClient.PutPageBlob(vhdContainerName, name, vhdSize, tags)
+	if err != nil {
+		return "", "", fmt.Errorf("failed to put page blob: %v", err)
+	}
+	// add VHD signature to the blob
+	h, err := createVHDHeader(uint64(size))
+	if err != nil {
+		az.deleteVhdBlob(accountName, accountKey, name)
+		return "", "", fmt.Errorf("failed to create vhd header, err: %v", err)
+	}
+	if err = blobClient.PutPage(vhdContainerName, name, size, vhdSize-1, azs.PageWriteTypeUpdate, h[:vhdHeaderSize], nil); err != nil {
+		az.deleteVhdBlob(accountName, accountKey, name)
+		return "", "", fmt.Errorf("failed to update vhd header, err: %v", err)
+	}
+
+	scheme := "http"
+	if useHTTPS {
+		scheme = "https"
+	}
+	host := fmt.Sprintf("%s://%s.%s.%s", scheme, accountName, blobServiceName, az.Environment.StorageEndpointSuffix)
+	uri := fmt.Sprintf("%s/%s/%s", host, vhdContainerName, name)
+	return name, uri, nil
+
+}
+
+// delete a vhd blob
+func (az *Cloud) deleteVhdBlob(accountName, accountKey, blobName string) error {
+	blobClient, err := az.getBlobClient(accountName, accountKey)
+	if err == nil {
+		return blobClient.DeleteBlob(vhdContainerName, blobName, nil)
+	}
+	return err
+}
+
+func (az *Cloud) getBlobClient(accountName, accountKey string) (*azs.BlobStorageClient, error) {
+	client, err := azs.NewClient(accountName, accountKey, az.Environment.StorageEndpointSuffix, azs.DefaultAPIVersion, useHTTPS)
+	if err != nil {
+		return nil, fmt.Errorf("error creating azure client: %v", err)
+	}
+	b := client.GetBlobService()
+	return &b, nil
+}
+
+// get uri https://foo.blob.core.windows.net/vhds/bar.vhd and return foo (account) and bar.vhd (blob name)
+func (az *Cloud) getBlobNameAndAccountFromURI(uri string) (string, string, error) {
+	scheme := "http"
+	if useHTTPS {
+		scheme = "https"
+	}
+	host := fmt.Sprintf("%s://(.*).%s.%s", scheme, blobServiceName, az.Environment.StorageEndpointSuffix)
+	reStr := fmt.Sprintf("%s/%s/(.*)", host, vhdContainerName)
+	re := regexp.MustCompile(reStr)
+	res := re.FindSubmatch([]byte(uri))
+	if len(res) < 3 {
+		return "", "", fmt.Errorf("invalid vhd URI for regex %s: %s", reStr, uri)
+	}
+	return string(res[1]), string(res[2]), nil
+}