MyFirstApp: Block storage section for gophercloud

Adding the code for interact with the block storage service with go.

Change-Id: Ie148af56ca1bc811a01eabe4d9fe2fdd1f92aa52

firstapp/samples/gophercloud/block_storage.go

@@ -0,0 +1,135 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/gophercloud/gophercloud"
+	"github.com/gophercloud/gophercloud/openstack"
+	"github.com/gophercloud/gophercloud/openstack/blockstorage/v1/volumes"
+	"github.com/gophercloud/gophercloud/openstack/compute/v2/extensions/keypairs"
+	"github.com/gophercloud/gophercloud/openstack/compute/v2/extensions/secgroups"
+	"github.com/gophercloud/gophercloud/openstack/compute/v2/extensions/volumeattach"
+	"github.com/gophercloud/gophercloud/openstack/compute/v2/servers"
+	"github.com/gophercloud/gophercloud/pagination"
+)
+
+func main() {
+
+	// step-1
+	authOpts, err := openstack.AuthOptionsFromEnv()
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	provider, err := openstack.AuthenticatedClient(authOpts)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	var regionName = os.Getenv("OS_REGION_NAME")
+	volumeClient, err := openstack.NewBlockStorageV1(provider, gophercloud.EndpointOpts{
+		Region: regionName,
+	})
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	// step-2
+	volumeOpts := volumes.CreateOpts{Size: 1, Name: "test"}
+	volume, err := volumes.Create(volumeClient, volumeOpts).Extract()
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	// step-3
+	_ = volumes.List(volumeClient, nil).EachPage(func(page pagination.Page) (bool, error) {
+		volumeList, _ := volumes.ExtractVolumes(page)
+		for _, vol := range volumeList {
+			fmt.Println(vol)
+		}
+		return true, nil
+	})
+
+	// step-4
+	computeClient, err := openstack.NewComputeV2(provider, gophercloud.EndpointOpts{
+		Region: regionName,
+		Type:   "computev21",
+	})
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	securityGroupName := "database"
+	databaseSecurityGroup, _ := secgroups.Create(computeClient, secgroups.CreateOpts{
+		Name:        securityGroupName,
+		Description: "for database service",
+	}).Extract()
+	secgroups.CreateRule(computeClient, secgroups.CreateRuleOpts{
+		ParentGroupID: databaseSecurityGroup.ID,
+		FromPort:      22,
+		ToPort:        22,
+		IPProtocol:    "TCP",
+		CIDR:          "0.0.0.0/0",
+	}).Extract()
+	secgroups.CreateRule(computeClient, secgroups.CreateRuleOpts{
+		ParentGroupID: databaseSecurityGroup.ID,
+		FromPort:      3306,
+		ToPort:        3306,
+		IPProtocol:    "TCP",
+		CIDR:          "0.0.0.0/0",
+	}).Extract()
+
+	userData := `#!/usr/bin/env bash
+		curl -L -s https://git.openstack.org/cgit/openstack/faafo/plain/contrib/install.sh | bash -s -- \
+		-i faafo -i messaging -r api -r worker -r demo`
+
+	imageID := "41ba40fd-e801-4639-a842-e3a2e5a2ebdd"
+	flavorID := "3"
+	networkID := "aba7a6f8-6ec9-4666-8c42-ac2d00707010"
+
+	serverOpts := servers.CreateOpts{
+		Name:           "app-database",
+		ImageRef:       imageID,
+		FlavorRef:      flavorID,
+		Networks:       []servers.Network{servers.Network{UUID: networkID}},
+		SecurityGroups: []string{securityGroupName},
+		UserData:       []byte(userData),
+	}
+
+	server, err := servers.Create(computeClient, keypairs.CreateOptsExt{
+		CreateOptsBuilder: serverOpts,
+		KeyName:           "demokey",
+	}).Extract()
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	servers.WaitForStatus(computeClient, server.ID, "ACTIVE", 300)
+
+	// step-5
+	volumeAttachOptions := volumeattach.CreateOpts{
+		VolumeID: volume.ID,
+	}
+
+	volumeAttach, err := volumeattach.Create(computeClient, server.ID, volumeAttachOptions).Extract()
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	volumes.WaitForStatus(volumeClient, volumeAttach.ID, "available", 60)
+
+	// step-6
+	err = volumeattach.Delete(computeClient, server.ID, volume.ID).ExtractErr()
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	volumes.WaitForStatus(volumeClient, volume.ID, "available", 60)
+	volumes.Delete(volumeClient, volume.ID)
+}

firstapp/source/block_storage.rst

@@ -83,6 +83,13 @@ Connect to the API endpoint:
         :start-after: step-1
         :end-before: step-2
 
+.. only:: gophercloud
+
+    .. literalinclude:: ../samples/gophercloud/block_storage.go
+        :language: go
+        :start-after: step-1
+        :end-before: step-2
+
 To try it out, make a 1GB volume called 'test'.
 
 .. only:: libcloud
@@ -112,6 +119,15 @@ To try it out, make a 1GB volume called 'test'.
 
     .. note:: The parameter :code:`size` is in gigabytes.
 
+.. only:: gophercloud
+
+    .. literalinclude:: ../samples/gophercloud/block_storage.go
+        :language: go
+        :start-after: step-2
+        :end-before: step-3
+
+    .. note:: The parameter :code:`Size` is in gigabytes.
+
 To see if the volume creation was successful, list all volumes:
 
 .. only:: libcloud
@@ -139,7 +155,12 @@ To see if the volume creation was successful, list all volumes:
         :start-after: step-3
         :end-before: step-4
 
-Attach the storage volume to a running instance.
+.. only:: gophercloud
+
+    .. literalinclude:: ../samples/gophercloud/block_storage.go
+        :language: go
+        :start-after: step-3
+        :end-before: step-4
 
 Use Block Storage for the Fractal database server
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -172,6 +193,13 @@ MySQL, port 3306) from the network:
         :start-after: step-4
         :end-before: step-5
 
+.. only:: gophercloud
+
+    .. literalinclude:: ../samples/gophercloud/block_storage.go
+        :language: go
+        :start-after: step-4
+        :end-before: step-5
+
 Create a volume object by using the unique identifier (UUID) for the
 volume. Then, use the server object from the previous code snippet to
 attach the volume to it at :code:`/dev/vdb`:
@@ -197,6 +225,13 @@ attach the volume to it at :code:`/dev/vdb`:
         :start-after: step-5
         :end-before: step-6
 
+.. only:: gophercloud
+
+    .. literalinclude:: ../samples/gophercloud/block_storage.go
+        :language: go
+        :start-after: step-5
+        :end-before: step-6
+
 Log in to the server to run the following steps.
 
 .. note:: Replace :code:`IP_DATABASE` with the IP address of the
@@ -307,6 +342,12 @@ To detach and delete a volume:
         :language: python
         :start-after: step-6
 
+.. only:: gophercloud
+
+    .. literalinclude:: ../samples/gophercloud/block_storage.go
+        :language: go
+        :start-after: step-6
+
 .. only:: libcloud
 
     Other features, such as creating volume snapshots, are useful for backups: