Add Resell V2 licenses Get method and structure (#49)

Add basic License structure and Get method.
Add doc example and tests.

selvpcclient/resell/v2/licenses/doc.go

@@ -0,0 +1,13 @@
+/*
+Package licenses provides the ability to retrieve and manage licenses through
+the Resell v2 API.
+
+Example of getting a single license referenced by its id
+
+  license, _, err := licenses.Get(context, resellClient, licenseID)
+  if err != nil {
+    log.Fatal(err)
+  }
+	fmt.Println(license)
+*/
+package licenses

selvpcclient/resell/v2/licenses/requests.go

@@ -0,0 +1,33 @@
+package licenses
+
+import (
+	"context"
+	"strings"
+
+	"github.com/selectel/go-selvpcclient/selvpcclient"
+)
+
+const resourceURL = "licenses"
+
+// Get returns a single license by its id.
+func Get(ctx context.Context, client *selvpcclient.ServiceClient, id string) (*License, *selvpcclient.ResponseResult, error) {
+	url := strings.Join([]string{client.Endpoint, resourceURL, id}, "/")
+	responseResult, err := client.DoRequest(ctx, "GET", url, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	if responseResult.Err != nil {
+		return nil, responseResult, responseResult.Err
+	}
+
+	// Extract a license from the response body.
+	var result struct {
+		License *License `json:"license"`
+	}
+	err = responseResult.ExtractResult(&result)
+	if err != nil {
+		return nil, responseResult, err
+	}
+
+	return result.License, responseResult, nil
+}

selvpcclient/resell/v2/licenses/schemas.go

@@ -0,0 +1,24 @@
+package licenses
+
+import "github.com/selectel/go-selvpcclient/selvpcclient/resell/v2/servers"
+
+// License represents a single Resell Floating IP.
+type License struct {
+	// ID is a unique id of the license.
+	ID string `json:"id"`
+
+	// ProjectID represents an associated Resell project.
+	ProjectID string `json:"project_id"`
+
+	// Region represents a region of where the license resides.
+	Region string `json:"region"`
+
+	// Servers contains info about servers to which license is associated to.
+	Servers []servers.Server `json:"servers"`
+
+	// Status represents a current status of the license.
+	Status string `json:"status"`
+
+	// Type represent a license type.
+	Type string `json:"type"`
+}

selvpcclient/resell/v2/licenses/testing/fixtures.go

@@ -0,0 +1,48 @@
+package testing
+
+import (
+	"time"
+
+	"github.com/selectel/go-selvpcclient/selvpcclient/resell/v2/licenses"
+	"github.com/selectel/go-selvpcclient/selvpcclient/resell/v2/servers"
+)
+
+// TestGetLicenseResponseRaw represents a raw response from the Get request.
+const TestGetLicenseResponseRaw = `
+{
+    "license": {
+        "id": "123123",
+        "project_id": "49338ac045f448e294b25d013f890317",
+        "region": "ru-2",
+        "servers": [
+            {
+                "id": "253b680c-89f6-4c85-afbf-c9a67c92d3fe",
+                "name": "Node00",
+                "status": "ACTIVE",
+                "updated": "2018-02-20T22:02:21Z"
+            }
+        ],
+        "status": "ACTIVE",
+        "type": "license_windows_2012_standard"
+    }
+}
+`
+
+var licenseServerTimeStamp, _ = time.Parse(time.RFC3339, "2018-02-20T22:02:21Z")
+
+// TestGetLicenseResponse represents an unmarshalled TestGetLicenseResponseRaw.
+var TestGetLicenseResponse = &licenses.License{
+	ID:        "123123",
+	ProjectID: "49338ac045f448e294b25d013f890317",
+	Region:    "ru-2",
+	Status:    "ACTIVE",
+	Type:      "license_windows_2012_standard",
+	Servers: []servers.Server{
+		{
+			ID:      "253b680c-89f6-4c85-afbf-c9a67c92d3fe",
+			Name:    "Node00",
+			Status:  "ACTIVE",
+			Updated: licenseServerTimeStamp,
+		},
+	},
+}

selvpcclient/resell/v2/licenses/testing/requests_test.go

@@ -0,0 +1,38 @@
+package testing
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"reflect"
+	"testing"
+
+	"github.com/selectel/go-selvpcclient/selvpcclient/resell/v2/licenses"
+	"github.com/selectel/go-selvpcclient/selvpcclient/testutils"
+)
+
+func TestGetLicense(t *testing.T) {
+	testEnv := testutils.SetupTestEnv()
+	defer testEnv.TearDownTestEnv()
+	testEnv.NewTestResellV2Client()
+	testEnv.Mux.HandleFunc("/resell/v2/licenses/123123", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Add("Content-Type", "application/json")
+		fmt.Fprintf(w, TestGetLicenseResponseRaw)
+
+		if r.Method != http.MethodGet {
+			t.Fatalf("expected %s method but got %s", http.MethodGet, r.Method)
+		}
+	})
+
+	ctx := context.Background()
+	actual, _, err := licenses.Get(ctx, testEnv.Client, "123123")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expected := TestGetLicenseResponse
+
+	if !reflect.DeepEqual(actual, expected) {
+		t.Fatalf("expected %#v, but got %#v", expected, actual)
+	}
+}