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/*
* 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 app
import (
"encoding/base64"
"encoding/json"
"math/rand"
"k8splugin/internal/db"
"k8splugin/internal/helm"
"k8splugin/internal/rb"
pkgerrors "github.com/pkg/errors"
)
// InstanceRequest contains the parameters needed for instantiation
// of profiles
type InstanceRequest struct {
RBName string `json:"rb-name"`
RBVersion string `json:"rb-version"`
ProfileName string `json:"profile-name"`
CloudRegion string `json:"cloud-region"`
Labels map[string]string `json:"labels"`
}
// InstanceResponse contains the response from instantiation
type InstanceResponse struct {
ID string `json:"id"`
RBName string `json:"rb-name"`
RBVersion string `json:"rb-version"`
ProfileName string `json:"profile-name"`
CloudRegion string `json:"cloud-region"`
Namespace string `json:"namespace"`
Resources []helm.KubernetesResource `json:"resources"`
}
// InstanceManager is an interface exposes the instantiation functionality
type InstanceManager interface {
Create(i InstanceRequest) (InstanceResponse, error)
Get(id string) (InstanceResponse, error)
Delete(id string) error
}
// InstanceKey is used as the primary key in the db
type InstanceKey struct {
ID string `json:"id"`
}
// We will use json marshalling to convert to string to
// preserve the underlying structure.
func (dk InstanceKey) String() string {
out, err := json.Marshal(dk)
if err != nil {
return ""
}
return string(out)
}
// InstanceClient implements the InstanceManager interface
// It will also be used to maintain some localized state
type InstanceClient struct {
storeName string
tagInst string
}
// Using 6 bytes of randomness to generate an 8 character string
func generateInstanceID() string {
b := make([]byte, 6)
rand.Read(b)
return base64.URLEncoding.EncodeToString(b)
}
// NewInstanceClient returns an instance of the InstanceClient
// which implements the InstanceManager
func NewInstanceClient() *InstanceClient {
return &InstanceClient{
storeName: "rbdef",
tagInst: "instance",
}
}
// Create an entry for the resource bundle profile in the database
func (v *InstanceClient) Create(i InstanceRequest) (InstanceResponse, error) {
// Name is required
if i.RBName == "" || i.RBVersion == "" || i.ProfileName == "" || i.CloudRegion == "" {
return InstanceResponse{},
pkgerrors.New("RBName, RBversion, ProfileName, CloudRegion are required to create a new instance")
}
//Check if profile exists
profile, err := rb.NewProfileClient().Get(i.RBName, i.RBVersion, i.ProfileName)
if err != nil {
return InstanceResponse{}, pkgerrors.New("Unable to find Profile to create instance")
}
overrideValues := []string{}
//Execute the kubernetes create command
sortedTemplates, err := rb.NewProfileClient().Resolve(i.RBName, i.RBVersion, i.ProfileName, overrideValues)
if err != nil {
return InstanceResponse{}, pkgerrors.Wrap(err, "Error resolving helm charts")
}
k8sClient := KubernetesClient{}
err = k8sClient.init(i.CloudRegion)
if err != nil {
return InstanceResponse{}, pkgerrors.Wrap(err, "Getting CloudRegion Information")
}
createdResources, err := k8sClient.createResources(sortedTemplates, profile.Namespace)
if err != nil {
return InstanceResponse{}, pkgerrors.Wrap(err, "Create Kubernetes Resources")
}
id := generateInstanceID()
//Compose the return response
resp := InstanceResponse{
ID: id,
RBName: i.RBName,
RBVersion: i.RBVersion,
ProfileName: i.ProfileName,
CloudRegion: i.CloudRegion,
Namespace: profile.Namespace,
Resources: createdResources,
}
key := InstanceKey{
ID: id,
}
err = db.DBconn.Create(v.storeName, key, v.tagInst, resp)
if err != nil {
return InstanceResponse{}, pkgerrors.Wrap(err, "Creating Instance DB Entry")
}
return resp, nil
}
// Get returns the instance for corresponding ID
func (v *InstanceClient) Get(id string) (InstanceResponse, error) {
key := InstanceKey{
ID: id,
}
value, err := db.DBconn.Read(v.storeName, key, v.tagInst)
if err != nil {
return InstanceResponse{}, pkgerrors.Wrap(err, "Get Instance")
}
//value is a byte array
if value != nil {
resp := InstanceResponse{}
err = db.DBconn.Unmarshal(value, &resp)
if err != nil {
return InstanceResponse{}, pkgerrors.Wrap(err, "Unmarshaling Instance Value")
}
return resp, nil
}
return InstanceResponse{}, pkgerrors.New("Error getting Instance")
}
// Delete the Instance from database
func (v *InstanceClient) Delete(id string) error {
inst, err := v.Get(id)
if err != nil {
return pkgerrors.Wrap(err, "Error getting Instance")
}
k8sClient := KubernetesClient{}
err = k8sClient.init(inst.CloudRegion)
if err != nil {
return pkgerrors.Wrap(err, "Getting CloudRegion Information")
}
err = k8sClient.deleteResources(inst.Resources, inst.Namespace)
if err != nil {
return pkgerrors.Wrap(err, "Deleting Instance Resources")
}
key := InstanceKey{
ID: id,
}
err = db.DBconn.Delete(v.storeName, key, v.tagInst)
if err != nil {
return pkgerrors.Wrap(err, "Delete Instance")
}
return nil
}
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