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path: root/src/dcm/pkg/module/quota.go
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/*
* Copyright 2020 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 (
    pkgerrors "github.com/pkg/errors"
)

// Quota contains the parameters needed for a Quota 
type Quota struct {
    MetaData            QMetaDataList        `json:"metadata"`
    Specification       QSpec                `json:"spec"`
}


// MetaData contains the parameters needed for metadata
type QMetaDataList struct {
    QuotaName           string  `json:"name"`
    Description         string  `json:"description"`
}

// Spec contains the parameters needed for spec
type QSpec struct {
    LimitsCPU                   string      `json:"limits.cpu"`
    LimitsMemory                string      `json:"limits.memory"`
    RequestsCPU                 string      `json:"requests.cpu"`
    RequestsMemory              string      `json:"requests.memory"`
    RequestsStorage             string      `json:"requests.storage"`
    LimitsEphemeralStorage      string      `json:"limits.ephemeral.storage"`
    PersistentVolumeClaims      string      `json:"persistentvolumeclaims"`
    Pods                        string      `json:"pods"`
    ConfigMaps                  string      `json:"configmaps"`
    ReplicationControllers      string      `json:"replicationcontrollers"`
    ResourceQuotas              string      `json:"resourcequotas"`
    Services                    string      `json:"services"`
    ServicesLoadBalancers       string      `json:"services.loadbalancers"`
    ServicesNodePorts           string      `json:"services.nodeports"`
    Secrets                     string      `json:"secrets"`
    CountReplicationControllers string      `json:"count/replicationcontrollers"`
    CountDeploymentsApps        string      `json:"count/deployments.apps"`
    CountReplicasetsApps        string      `json:"count/replicasets.apps"`
    CountStatefulSets           string      `json:"count/statefulsets.apps"`
    CountJobsBatch              string      `json:"count/jobs.batch"`
    CountCronJobsBatch          string      `json:"count/cronjobs.batch"`
    CountDeploymentsExtensions  string      `json:"count/deployments.extensions"`
}

// QuotaKey is the key structure that is used in the database
type QuotaKey struct {
    Project             string      `json:"project"`
    LogicalCloudName    string      `json:"logical-cloud-name"`
    QuotaName           string      `json:"qname"`
}

// QuotaManager is an interface that exposes the connection
// functionality
type QuotaManager interface {
    CreateQuota(project, logicalCloud string, c Quota) (Quota, error)
    GetQuota(project, logicalCloud, name string) (Quota, error)
    GetAllQuotas(project, logicalCloud string) ([]Quota, error)
    DeleteQuota(project, logicalCloud, name string) error
    UpdateQuota(project, logicalCloud, name string, c Quota) (Quota, error)
}

// QuotaClient implements the QuotaManager
// It will also be used to maintain some localized state
type QuotaClient struct {
    storeName   string
    tagMeta     string
    util        Utility
}

// QuotaClient returns an instance of the QuotaClient
// which implements the QuotaManager
func NewQuotaClient() *QuotaClient {
    service := DBService{}
    return &QuotaClient{
        storeName:   "orchestrator",
        tagMeta:     "quota",
        util:       service,
    }
}

// Create entry for the quota resource in the database
func (v *QuotaClient) CreateQuota(project, logicalCloud string, c Quota) (Quota, error) {

    //Construct key consisting of name
    key := QuotaKey{
        Project:            project,
        LogicalCloudName:   logicalCloud,
        QuotaName:          c.MetaData.QuotaName,
    }

    //Check if project exists
    err := v.util.CheckProject(project)
    if err != nil {
        return Quota{}, pkgerrors.New("Unable to find the project")
    }
    //check if logical cloud exists
    err = v.util.CheckLogicalCloud(project, logicalCloud)
    if err != nil {
        return Quota{}, pkgerrors.New("Unable to find the logical cloud")
    }
    //Check if this Quota already exists
    _, err = v.GetQuota(project, logicalCloud, c.MetaData.QuotaName)
    if err == nil {
        return Quota{}, pkgerrors.New("Quota already exists")
    }

    err = v.util.DBInsert(v.storeName, key, nil, v.tagMeta, c)
    if err != nil {
        return Quota{}, pkgerrors.Wrap(err, "Creating DB Entry")
    }

    return c, nil
}

// Get returns Quota for corresponding quota name
func (v *QuotaClient) GetQuota(project, logicalCloud, quotaName string) (Quota, error) {

    //Construct the composite key to select the entry
    key := QuotaKey{
        Project:            project,
        LogicalCloudName:   logicalCloud,
        QuotaName:          quotaName,
    }
    value, err := v.util.DBFind(v.storeName, key, v.tagMeta)
    if err != nil {
        return Quota{}, pkgerrors.Wrap(err, "Quota")
    }

    //value is a byte array
    if value != nil {
        q := Quota{}
        err = v.util.DBUnmarshal(value[0], &q)
        if err != nil {
            return Quota{}, pkgerrors.Wrap(err, "Unmarshaling value")
        }
        return q, nil
    }

    return Quota{}, pkgerrors.New("Error getting Quota")
}

// GetAll returns all cluster quotas in the logical cloud
func (v *QuotaClient) GetAllQuotas(project, logicalCloud string) ([]Quota, error) {
    //Construct the composite key to select the entry
    key := QuotaKey{
        Project:            project,
        LogicalCloudName:   logicalCloud,
        QuotaName:          "",
    }
    var resp []Quota
    values, err := v.util.DBFind(v.storeName, key, v.tagMeta)
    if err != nil {
        return []Quota{}, pkgerrors.Wrap(err, "Get All Quotas")
    }

    for _, value := range values {
        q := Quota{}
        err = v.util.DBUnmarshal(value, &q)
        if err != nil {
            return []Quota{}, pkgerrors.Wrap(err, "Unmarshaling value")
        }
        resp = append(resp, q)
    }

    return resp, nil
}

// Delete the Quota entry from database
func (v *QuotaClient) DeleteQuota(project, logicalCloud, quotaName string) error {
    //Construct the composite key to select the entry
    key := QuotaKey{
        Project:            project,
        LogicalCloudName:   logicalCloud,
        QuotaName:          quotaName,
    }
    err := v.util.DBRemove(v.storeName, key)
    if err != nil {
        return pkgerrors.Wrap(err, "Delete Quota")
    }
    return nil
}

// Update an entry for the Quota in the database
func (v *QuotaClient) UpdateQuota(project, logicalCloud, quotaName string, c Quota) (Quota, error) {

    key := QuotaKey{
        Project:            project,
        LogicalCloudName:   logicalCloud,
        QuotaName:          quotaName,
    }
    //Check quota URL name against the quota json name
    if c.MetaData.QuotaName != quotaName {
        return Quota{}, pkgerrors.New("Update Error - Quota name mismatch")
    }
    //Check if this Quota exists
    _, err := v.GetQuota(project, logicalCloud, quotaName)
    if err != nil {
        return Quota{}, pkgerrors.New("Update Error - Quota doesn't exist")
    }
    err = v.util.DBInsert(v.storeName, key, nil, v.tagMeta, c)
    if err != nil {
        return Quota{}, pkgerrors.Wrap(err, "Updating DB Entry")
    }
    return c, nil
}