Day 2 Configuration API's

This patch adds Configuration API's
https://wiki.onap.org/display/DW/MultiCloud+K8s-Plugin-service+API%27s

Change-Id: I52ebfc5aa980ec8af4a31569d569216e9a2a760c
Issue-ID: MULTICLOUD-464
Signed-off-by: rsood <ritu.sood@intel.com>

1 files changed, 257 insertions, 0 deletions

diff --git a/src/k8splugin/internal/rb/config_template.go b/src/k8splugin/internal/rb/config_template.go
new file mode 100644
index 00000000..cdb1b907
--- /dev/null
+++ b/src/k8splugin/internal/rb/config_template.go
@@ -0,0 +1,257 @@
+/*
+ * Copyright 2018 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 rb
+
+import (
+	"bytes"
+	"encoding/json"
+	"io/ioutil"
+	"k8splugin/internal/db"
+	"os"
+	"path/filepath"
+
+	"encoding/base64"
+
+	pkgerrors "github.com/pkg/errors"
+	"log"
+)
+
+// ConfigTemplate contains the parameters needed for ConfigTemplates
+type ConfigTemplate struct {
+	TemplateName string `json:"template-name"`
+	Description  string `json:"description"`
+	ChartName    string
+}
+
+// ConfigTemplateManager is an interface exposes the resource bundle  ConfigTemplate functionality
+type ConfigTemplateManager interface {
+	Create(rbName, rbVersion string, p ConfigTemplate) error
+	Get(rbName, rbVersion, templateName string) (ConfigTemplate, error)
+	Delete(rbName, rbVersion, templateName string) error
+	Upload(rbName, rbVersion, templateName string, inp []byte) error
+}
+
+// ConfigTemplateKey is key struct
+type ConfigTemplateKey struct {
+	RBName       string `json:"rb-name"`
+	RBVersion    string `json:"rb-version"`
+	TemplateName string `json:"template-name"`
+}
+
+// We will use json marshalling to convert to string to
+// preserve the underlying structure.
+func (dk ConfigTemplateKey) String() string {
+	out, err := json.Marshal(dk)
+	if err != nil {
+		return ""
+	}
+
+	return string(out)
+}
+
+// ConfigTemplateClient implements the  ConfigTemplateManager
+// It will also be used to maintain some localized state
+type ConfigTemplateClient struct {
+	storeName  string
+	tagMeta    string
+	tagContent string
+}
+
+// NewConfigTemplateClient returns an instance of the  ConfigTemplateClient
+// which implements the  ConfigTemplateManager
+func NewConfigTemplateClient() *ConfigTemplateClient {
+	return &ConfigTemplateClient{
+		storeName:  "rbdef",
+		tagMeta:    "metadata",
+		tagContent: "content",
+	}
+}
+
+// Create an entry for the resource bundle  ConfigTemplate in the database
+func (v *ConfigTemplateClient) Create(rbName, rbVersion string, p ConfigTemplate) error {
+
+	log.Printf("[ConfigiTemplate]: create %s", rbName)
+	// Name is required
+	if p.TemplateName == "" {
+		return pkgerrors.New("Name is required for Resource Bundle  ConfigTemplate")
+	}
+
+	//Check if  ConfigTemplate already exists
+	_, err := v.Get(rbName, rbVersion, p.TemplateName)
+	if err == nil {
+		return pkgerrors.New(" ConfigTemplate already exists for this Definition")
+	}
+
+	//Check if provided resource bundle information is valid
+	_, err = NewDefinitionClient().Get(rbName, rbVersion)
+	if err != nil {
+		return pkgerrors.Errorf("Invalid Resource Bundle ID provided: %s", err.Error())
+	}
+
+	key := ConfigTemplateKey{
+		RBName:       rbName,
+		RBVersion:    rbVersion,
+		TemplateName: p.TemplateName,
+	}
+
+	err = db.DBconn.Create(v.storeName, key, v.tagMeta, p)
+	if err != nil {
+		return pkgerrors.Wrap(err, "Creating  ConfigTemplate DB Entry")
+	}
+
+	return nil
+}
+
+// Get returns the Resource Bundle  ConfigTemplate for corresponding ID
+func (v *ConfigTemplateClient) Get(rbName, rbVersion, templateName string) (ConfigTemplate, error) {
+	key := ConfigTemplateKey{
+		RBName:       rbName,
+		RBVersion:    rbVersion,
+		TemplateName: templateName,
+	}
+	value, err := db.DBconn.Read(v.storeName, key, v.tagMeta)
+	if err != nil {
+		return ConfigTemplate{}, pkgerrors.Wrap(err, "Get ConfigTemplate")
+	}
+
+	//value is a byte array
+	if value != nil {
+		template := ConfigTemplate{}
+		err = db.DBconn.Unmarshal(value, &template)
+		if err != nil {
+			return ConfigTemplate{}, pkgerrors.Wrap(err, "Unmarshaling  ConfigTemplate Value")
+		}
+		return template, nil
+	}
+
+	return ConfigTemplate{}, pkgerrors.New("Error getting ConfigTemplate")
+}
+
+// Delete the Resource Bundle  ConfigTemplate from database
+func (v *ConfigTemplateClient) Delete(rbName, rbVersion, templateName string) error {
+	key := ConfigTemplateKey{
+		RBName:       rbName,
+		RBVersion:    rbVersion,
+		TemplateName: templateName,
+	}
+	err := db.DBconn.Delete(v.storeName, key, v.tagMeta)
+	if err != nil {
+		return pkgerrors.Wrap(err, "Delete ConfigTemplate")
+	}
+
+	err = db.DBconn.Delete(v.storeName, key, v.tagContent)
+	if err != nil {
+		return pkgerrors.Wrap(err, "Delete  ConfigTemplate Content")
+	}
+
+	return nil
+}
+
+// Upload the contents of resource bundle into database
+func (v *ConfigTemplateClient) Upload(rbName, rbVersion, templateName string, inp []byte) error {
+
+	log.Printf("[ConfigTemplate]: Upload %s", templateName)
+	key := ConfigTemplateKey{
+		RBName:       rbName,
+		RBVersion:    rbVersion,
+		TemplateName: templateName,
+	}
+	//ignore the returned data here.
+	t, err := v.Get(rbName, rbVersion, templateName)
+	if err != nil {
+		return pkgerrors.Errorf("Invalid  ConfigTemplate Name  provided %s", err.Error())
+	}
+
+	err = isTarGz(bytes.NewBuffer(inp))
+	if err != nil {
+		return pkgerrors.Errorf("Error in file format %s", err.Error())
+	}
+
+	chartBasePath, err := ExtractTarBall(bytes.NewBuffer(inp))
+	if err != nil {
+		return pkgerrors.Wrap(err, "Extracting Template")
+	}
+
+	finfo, err := ioutil.ReadDir(chartBasePath)
+	if err != nil {
+		return pkgerrors.Wrap(err, "Detecting chart name")
+	}
+
+	//Store the first directory with Chart.yaml found as the chart name
+	for _, f := range finfo {
+		if f.IsDir() {
+			//Check if Chart.yaml exists
+			if _, err = os.Stat(filepath.Join(chartBasePath, f.Name(), "Chart.yaml")); err == nil {
+				t.ChartName = f.Name()
+				break
+			}
+		}
+	}
+	if t.ChartName == "" {
+		return pkgerrors.New("Invalid template no Chart.yaml file found")
+	}
+
+	err = db.DBconn.Create(v.storeName, key, v.tagMeta, t)
+	if err != nil {
+		return pkgerrors.Wrap(err, "Creating  ConfigTemplate DB Entry")
+	}
+
+	//Encode given byte stream to text for storage
+	encodedStr := base64.StdEncoding.EncodeToString(inp)
+	err = db.DBconn.Create(v.storeName, key, v.tagContent, encodedStr)
+	if err != nil {
+		return pkgerrors.Errorf("Error uploading data to db %s", err.Error())
+	}
+
+	return nil
+}
+
+// Download the contents of the ConfigTemplate from DB
+// Returns a byte array of the contents
+func (v *ConfigTemplateClient) Download(rbName, rbVersion, templateName string) ([]byte, error) {
+
+	log.Printf("[ConfigTemplate]: Download %s", templateName)
+	//ignore the returned data here
+	//Check if rb is valid
+	_, err := v.Get(rbName, rbVersion, templateName)
+	if err != nil {
+		return nil, pkgerrors.Errorf("Invalid  ConfigTemplate Name provided: %s", err.Error())
+	}
+
+	key := ConfigTemplateKey{
+		RBName:       rbName,
+		RBVersion:    rbVersion,
+		TemplateName: templateName,
+	}
+	value, err := db.DBconn.Read(v.storeName, key, v.tagContent)
+	if err != nil {
+		return nil, pkgerrors.Wrap(err, "Get Resource ConfigTemplate content")
+	}
+
+	if value != nil {
+		//Decode the string from base64
+		out, err := base64.StdEncoding.DecodeString(string(value))
+		if err != nil {
+			return nil, pkgerrors.Wrap(err, "Decode base64 string")
+		}
+
+		if out != nil && len(out) != 0 {
+			return out, nil
+		}
+	}
+	return nil, pkgerrors.New("Error downloading  ConfigTemplate content")
+}