Restructure code and create module library

Restructures and moves code to make it
aligned with the current design.
https://wiki.onap.org/display/DW/Multi+Cluster+Application+Scheduler
examples/example_module.go shows how to
import and use modules from this package.
Patch#2 Updated example

Issue-ID: MULTICLOUD-871
Signed-off-by: Ritu Sood <ritu.sood@intel.com>
Change-Id: Ia1e9802a946a07dcca8f79f0e2250933ab3efa66

1 files changed, 133 insertions, 0 deletions

diff --git a/src/orchestrator/pkg/module/project.go b/src/orchestrator/pkg/module/project.go
new file mode 100644
index 00000000..e44164f9
--- /dev/null
+++ b/src/orchestrator/pkg/module/project.go
@@ -0,0 +1,133 @@
+/*
+ * Copyright 2019 Intel Corporation, Inc
+ *
+ * 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 module
+
+import (
+	"encoding/json"
+
+	"github.com/onap/multicloud-k8s/src/orchestrator/pkg/infra/db"
+
+	pkgerrors "github.com/pkg/errors"
+)
+
+// Project contains the parameters needed for Projects
+// It implements the interface for managing the Projects
+type Project struct {
+	ProjectName string `json:"project-name"`
+	Description string `json:"description"`
+}
+
+// ProjectKey is the key structure that is used in the database
+type ProjectKey struct {
+	ProjectName string `json:"rb-name"`
+}
+
+// We will use json marshalling to convert to string to
+// preserve the underlying structure.
+func (pk ProjectKey) String() string {
+	out, err := json.Marshal(pk)
+	if err != nil {
+		return ""
+	}
+
+	return string(out)
+}
+
+// Manager is an interface exposes the Project functionality
+type ProjectManager interface {
+	CreateProject(pr Project) (Project, error)
+	GetProject(name string) (Project, error)
+	DeleteProject(name string) error
+}
+
+// ProjectClient implements the Manager
+// It will also be used to maintain some localized state
+type ProjectClient struct {
+	storeName           string
+	tagMeta, tagContent string
+}
+
+// NewProjectClient returns an instance of the ProjectClient
+// which implements the Manager
+func NewProjectClient() *ProjectClient {
+	return &ProjectClient{
+		tagMeta: "projectmetadata",
+	}
+}
+
+// CreateProject a new collection based on the project
+func (v *ProjectClient) CreateProject(p Project) (Project, error) {
+
+	//Construct the composite key to select the entry
+	key := ProjectKey{
+		ProjectName: p.ProjectName,
+	}
+
+	//Check if this Project already exists
+	_, err := v.GetProject(p.ProjectName)
+	if err == nil {
+		return Project{}, pkgerrors.New("Project already exists")
+	}
+
+	err = db.DBconn.Create(p.ProjectName, key, v.tagMeta, p)
+	if err != nil {
+		return Project{}, pkgerrors.Wrap(err, "Creating DB Entry")
+	}
+
+	return p, nil
+}
+
+// GetProject returns the Project for corresponding name
+func (v *ProjectClient) GetProject(name string) (Project, error) {
+
+	//Construct the composite key to select the entry
+	key := ProjectKey{
+		ProjectName: name,
+	}
+	value, err := db.DBconn.Read(name, key, v.tagMeta)
+	if err != nil {
+		return Project{}, pkgerrors.Wrap(err, "Get Project")
+	}
+
+	//value is a byte array
+	if value != nil {
+		proj := Project{}
+		err = db.DBconn.Unmarshal(value, &proj)
+		if err != nil {
+			return Project{}, pkgerrors.Wrap(err, "Unmarshaling Value")
+		}
+		return proj, nil
+	}
+
+	return Project{}, pkgerrors.New("Error getting Project")
+}
+
+// DeleteProject the  Project from database
+func (v *ProjectClient) DeleteProject(name string) error {
+
+	//Construct the composite key to select the entry
+	key := ProjectKey{
+		ProjectName: name,
+	}
+	err := db.DBconn.Delete(name, key, v.tagMeta)
+	if err != nil {
+		return pkgerrors.Wrap(err, "Delete Project Entry;")
+	}
+
+	//TODO: Delete the collection when the project is deleted
+	return nil
+}