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interrogate.go
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interrogate.go
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// Copyright 2019 Hewlett Packard Enterprise Development LP
// 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 catalog
import (
"fmt"
"strconv"
"strings"
kdv1 "github.com/bluek8s/kubedirector/pkg/apis/kubedirector/v1beta1"
"github.com/bluek8s/kubedirector/pkg/observer"
"github.com/bluek8s/kubedirector/pkg/shared"
v1 "k8s.io/api/core/v1"
)
// GetServiceFromID is a utility function that returns the service definition for
// the given service ID, or nil if no such service is defined.
func GetServiceFromID(
appCR *kdv1.KubeDirectorApp,
serviceID string,
) *kdv1.Service {
for _, serviceDef := range appCR.Spec.Services {
if serviceDef.ID == serviceID {
return &serviceDef
}
}
return nil
}
// GetAllServiceIDs is a utility function that returns the list of all
// service IDs.
func GetAllServiceIDs(
appCR *kdv1.KubeDirectorApp,
) []string {
var services []string
for _, serviceDef := range appCR.Spec.Services {
services = append(services, serviceDef.ID)
}
return services
}
// GetRoleFromID is a utility function that returns the service definition for
// the given service ID, or nil if no such service is defined.
func GetRoleFromID(
appCR *kdv1.KubeDirectorApp,
roleID string,
) *kdv1.NodeRole {
for _, nodeRole := range appCR.Spec.NodeRoles {
if nodeRole.ID == roleID {
return &nodeRole
}
}
return nil
}
// GetAllRoleIDs is a utility function that returns the list of all node roles
// ID.
func GetAllRoleIDs(
appCR *kdv1.KubeDirectorApp,
) []string {
var nodeRoles []string
for _, nodeRole := range appCR.Spec.NodeRoles {
nodeRoles = append(nodeRoles, nodeRole.ID)
}
return nodeRoles
}
// GetSelectedRoleIDs returns the list of selected roles in the config.
func GetSelectedRoleIDs(
appCR *kdv1.KubeDirectorApp,
) []string {
// Will be modified to accept config choices input when that is
// implemented.
return appCR.Spec.Config.SelectedRoles
}
// GetRoleCardinality is a utility function that fetches the cardinality value
// for a given app role along with whether it is a scale out cardinality
func GetRoleCardinality(
appRole *kdv1.NodeRole,
) (int32, bool) {
var count int
var isScaleOut = false
// Check if it is a scaleout cardinality
if strings.HasSuffix(appRole.Cardinality, "+") {
count, _ = strconv.Atoi(strings.Trim(appRole.Cardinality, "+"))
isScaleOut = true
} else {
count, _ = strconv.Atoi(appRole.Cardinality)
}
return int32(count), isScaleOut
}
// GetRoleMinResources is a utility function that fetches the minimum resources
// for a given app role
func GetRoleMinResources(
appRole *kdv1.NodeRole,
) *v1.ResourceList {
return appRole.MinResources
}
// GetRoleMinStorage is a utility function that fetches the minimum persistent
// storage spec given app role
func GetRoleMinStorage(
appRole *kdv1.NodeRole,
) *kdv1.MinStorage {
return appRole.MinStorage
}
// PortsForRole returns list of service port info (id and port num) for a given role.
// This will be used to export those ports as NodePort/LoadBalancer
func PortsForRole(
cr *kdv1.KubeDirectorCluster,
role string,
) ([]ServicePortInfo, error) {
//) ([]int32, error) {
// Fetch the app type definition if we haven't yet cached it in this
// handler pass.
appCR, err := GetApp(cr)
if err != nil {
return nil, err
}
var result []ServicePortInfo
// Match the role in the roleService and based on that fetch the service
// endpoint ports matching the service IDs.
for _, roleService := range appCR.Spec.Config.RoleServices {
if roleService.RoleID == role {
for _, service := range appCR.Spec.Services {
if shared.StringInList(service.ID, roleService.ServiceIDs) {
if service.Endpoint.Port != nil {
servicePortInfo := ServicePortInfo{
ID: service.ID,
Port: *(service.Endpoint.Port),
URLScheme: service.Endpoint.URLScheme,
}
result = append(result, servicePortInfo)
}
}
}
break
}
}
return result, nil
}
// ImageForRole returns the image to be used for pods in a given role.
func ImageForRole(
cr *kdv1.KubeDirectorCluster,
role string,
) (string, error) {
// Fetch the app type definition if we haven't yet cached it in this
// handler pass.
appCR, err := GetApp(cr)
if err != nil {
return "", err
}
for _, nodeRole := range appCR.Spec.NodeRoles {
if nodeRole.ID == role {
if nodeRole.ImageRepoTag != nil {
return *(nodeRole.ImageRepoTag), nil
}
// Should never reach here.
return "", fmt.Errorf(
"Image repo tag not set for role {%s} in app {%s}",
role,
cr.Spec.AppID,
)
}
}
// Should never reach here.
return "", fmt.Errorf(
"Role {%s} not found for app {%s} when searching for image repo tag",
role,
cr.Spec.AppID,
)
}
// AppSetupPackageInfo returns the app setup package info for a given role. The
// fact that this function is invoked means that setup package was specified
// either for the node role or the application as a whole.
func AppSetupPackageInfo(
cr *kdv1.KubeDirectorCluster,
role string,
) (*kdv1.SetupPackageInfo, error) {
// Fetch the app type definition if we haven't yet cached it in this
// handler pass.
appCR, err := GetApp(cr)
if err != nil {
return nil, err
}
for _, nodeRole := range appCR.Spec.NodeRoles {
if nodeRole.ID == role {
setupPackage := nodeRole.SetupPackage
// setupPackage will always be set because we mutated the spec during
// validation.
if setupPackage.IsNull == false {
return &setupPackage.Info, nil
}
// No config package for this role.
return nil, nil
}
}
// Should never reach here.
return nil, fmt.Errorf(
"Role {%s} not found for app {%s} when searching for config package",
role,
cr.Spec.AppID,
)
}
// SystemdRequired checks whether systemctl mounts are required for a given
// app.
func SystemdRequired(
cr *kdv1.KubeDirectorCluster,
) (bool, error) {
// Fetch the app type definition if we haven't yet cached it in this
// handler pass.
appCR, err := GetApp(cr)
if err != nil {
return false, err
}
return appCR.Spec.SystemdRequired, nil
}
// AgentRequired checks whether agent installation is required for a given app.
func AgentRequired(
cr *kdv1.KubeDirectorCluster,
) bool {
return false // currently, always false
}
// AppCapabilities fetches the required capabilities for a given app
func AppCapabilities(
cr *kdv1.KubeDirectorCluster,
) ([]v1.Capability, error) {
// Fetch the app type definition if we haven't yet cached it in this
// handler pass.
appCR, err := GetApp(cr)
if err != nil {
return []v1.Capability{}, err
}
return appCR.Spec.Capabilities, nil
}
// AppPersistDirs fetches the required directories for a given role that
// has be persisted on a PVC.
func AppPersistDirs(
cr *kdv1.KubeDirectorCluster,
role string,
) (*[]string, error) {
// Fetch the app type definition if we haven't yet cached it in this
// handler pass.
appCR, err := GetApp(cr)
if err != nil {
return nil, err
}
for _, nodeRole := range appCR.Spec.NodeRoles {
if nodeRole.ID == role {
// Validation hook has already mutated the role's PersistDirs value
// to match the global default if it was unspecified. If neither
// were specified then it will be nil, which is an acceptable
// result for the caller too.
return nodeRole.PersistDirs, nil
}
}
// Should never reach here.
return nil, fmt.Errorf(
"Role {%s} not found for app {%s} when searching for persist dirs",
role,
cr.Spec.AppID,
)
}
// RoleContainerSpecs fetches container spec properties
// that needs to be overridden by KDApp author
func RoleContainerSpecs(
cr *kdv1.KubeDirectorCluster,
role string,
) (*kdv1.ContainerSpec, error) {
appCR, err := GetApp(cr)
if err != nil {
return nil, err
}
for _, nodeRole := range appCR.Spec.NodeRoles {
if role == nodeRole.ID {
if nodeRole.ContainerSpec != nil {
return nodeRole.ContainerSpec, nil
}
}
}
return nil, nil
}
// FindApp returns the app type definition for the given virtual cluster. If
// the appCatalog property is set to "local", it looks in the same namespace
// as the cluster. If set to "system", it looks in the same namespace as
// KubeDirector. If unset, it checks the local namespace first and then the KD
// namespace. The returned values are the app CR (if found) and any error.
func FindApp(
cr *kdv1.KubeDirectorCluster,
) (*kdv1.KubeDirectorApp, error) {
resultFunc := func(appCR *kdv1.KubeDirectorApp, appErr error) (*kdv1.KubeDirectorApp, error) {
if appErr != nil {
return nil, fmt.Errorf(
"failed to fetch CR for the App : %s error %v",
cr.Spec.AppID,
appErr,
)
}
return appCR, nil
}
// Unless the spec explicitly asks to look only in the KD namespace, let's
// look in the local namespace first.
if cr.Spec.AppCatalog == nil || *(cr.Spec.AppCatalog) == shared.AppCatalogLocal {
appCR, appErr := observer.GetApp(cr.Namespace, cr.Spec.AppID)
// If we found the app CR or this is the only place we're allowed to
// look, then we're done.
if appErr == nil || cr.Spec.AppCatalog != nil {
return resultFunc(appCR, appErr)
}
}
// Now look in the KD namespace.
kdNamespace, nsErr := shared.GetKubeDirectorNamespace()
if nsErr != nil {
return nil, nsErr
}
return resultFunc(observer.GetApp(kdNamespace, cr.Spec.AppID))
}
// GetApp is a wrapper for FindApp that caches a pointer to the resulting
// app CR (if found) in the cluster CR.
func GetApp(
cr *kdv1.KubeDirectorCluster,
) (*kdv1.KubeDirectorApp, error) {
appCR, appErr := FindApp(cr)
if appErr != nil {
return nil, appErr
}
cr.AppSpec = appCR
return appCR, nil
}