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pgpool.go
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pgpool.go
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package cluster
/*
Copyright 2019 Crunchy Data Solutions, 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.
*/
import (
"bytes"
"encoding/json"
crv1 "github.com/crunchydata/postgres-operator/apis/cr/v1"
"github.com/crunchydata/postgres-operator/config"
"github.com/crunchydata/postgres-operator/kubeapi"
"github.com/crunchydata/postgres-operator/operator"
"github.com/crunchydata/postgres-operator/util"
log "github.com/sirupsen/logrus"
appsv1 "k8s.io/api/apps/v1"
"k8s.io/api/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"os"
"time"
)
type PgpoolPasswdFields struct {
Username string
Password string
}
type PgpoolHBAFields struct {
}
type PgpoolConfFields struct {
PG_PRIMARY_SERVICE_NAME string
PG_REPLICA_SERVICE_NAME string
PG_USERNAME string
PG_PASSWORD string
}
type PgpoolTemplateFields struct {
Name string
ClusterName string
SecretsName string
CCPImagePrefix string
CCPImageTag string
ContainerResources string
Port string
PrimaryServiceName string
ReplicaServiceName string
}
const PGPOOL_SUFFIX = "-pgpool"
func ReconfigurePgpoolFromTask(clientset *kubernetes.Clientset, restclient *rest.RESTClient, task *crv1.Pgtask, namespace string) {
log.Debugf("ReconfigurePgpoolFromTask task cluster=[%s]", task.Spec.Parameters[config.LABEL_PGPOOL_TASK_CLUSTER])
//look up the pgcluster from the task
clusterName := task.Spec.Parameters[config.LABEL_PGPOOL_TASK_CLUSTER]
pgcluster := crv1.Pgcluster{}
found, err := kubeapi.Getpgcluster(restclient, &pgcluster, clusterName, namespace)
if !found || err != nil {
log.Error(err)
return
}
depName := clusterName + "-pgpool"
//remove the pgpool deployment (deployment name is the same as svcname)
err = kubeapi.DeleteDeployment(clientset, depName, namespace)
if err != nil {
log.Error(err)
}
//remove the pgpool secret
secretName := clusterName + "-pgpool-secret"
err = kubeapi.DeleteSecret(clientset, secretName, namespace)
if err != nil {
log.Error(err)
}
//check for the deployment to be fully deleted
for i := 0; i < 10; i++ {
_, found, err := kubeapi.GetDeployment(clientset, depName, namespace)
if !found {
break
}
if err != nil {
log.Error(err)
}
log.Debugf("pgpool reconfigure sleeping till deployment [%s] is removed", depName)
time.Sleep(time.Second * time.Duration(4))
}
//create the pgpool but leave the existing service in place
err = AddPgpool(clientset, &pgcluster, namespace, false)
if err != nil {
log.Error(err)
return
}
//remove task to cleanup
err = kubeapi.Deletepgtask(restclient, task.Spec.Name, namespace)
if err != nil {
log.Error(err)
return
}
log.Debugf("reconfigure pgpool to cluster [%s]", clusterName)
}
func AddPgpoolFromTask(clientset *kubernetes.Clientset, restclient *rest.RESTClient, task *crv1.Pgtask, namespace string) {
log.Debugf("AddPgpoolFromTask task cluster=[%s]", task.Spec.Parameters[config.LABEL_PGPOOL_TASK_CLUSTER])
//look up the pgcluster from the task
clusterName := task.Spec.Parameters[config.LABEL_PGPOOL_TASK_CLUSTER]
pgcluster := crv1.Pgcluster{}
found, err := kubeapi.Getpgcluster(restclient, &pgcluster, clusterName, namespace)
if !found || err != nil {
log.Error(err)
return
}
userSpecifiedSecret := task.Spec.Parameters[config.LABEL_PGPOOL_SECRET]
if userSpecifiedSecret != "" {
pgcluster.Spec.UserLabels[config.LABEL_PGPOOL_SECRET] = userSpecifiedSecret
log.Debugf("user specified pgpool-secret %s is being used for this pgpool", userSpecifiedSecret)
}
err = AddPgpool(clientset, &pgcluster, namespace, true)
if err != nil {
log.Error(err)
return
}
//remove task
err = kubeapi.Deletepgtask(restclient, task.Spec.Name, namespace)
if err != nil {
log.Error(err)
return
}
//update the pgcluster CRD
pgcluster.Spec.UserLabels[config.LABEL_PGPOOL] = "true"
err = kubeapi.Updatepgcluster(restclient, &pgcluster, pgcluster.Name, namespace)
if err != nil {
log.Error(err)
return
}
log.Debugf("added pgpool to cluster [%s]", clusterName)
}
func DeletePgpoolFromTask(clientset *kubernetes.Clientset, restclient *rest.RESTClient, task *crv1.Pgtask, namespace string) {
log.Debugf("DeletePgpoolFromTask task cluster=[%s]", task.Spec.Parameters[config.LABEL_PGPOOL_TASK_CLUSTER])
//look up the pgcluster from the task
clusterName := task.Spec.Parameters[config.LABEL_PGPOOL_TASK_CLUSTER]
pgcluster := crv1.Pgcluster{}
found, err := kubeapi.Getpgcluster(restclient, &pgcluster, clusterName, namespace)
if !found || err != nil {
log.Error(err)
return
}
//remove the pgpool service
serviceName := clusterName + "-pgpool"
err = kubeapi.DeleteService(clientset, serviceName, namespace)
if err != nil {
log.Error(err)
}
//remove the pgpool deployment (deployment name is the same as svcname)
err = kubeapi.DeleteDeployment(clientset, serviceName, namespace)
if err != nil {
log.Error(err)
}
//remove the pgpool secret
secretName := clusterName + "-pgpool-secret"
err = kubeapi.DeleteSecret(clientset, secretName, namespace)
if err != nil {
log.Error(err)
}
//remove task
err = kubeapi.Deletepgtask(restclient, task.Spec.Name, namespace)
if err != nil {
log.Error(err)
}
//update the pgcluster CRD
pgcluster.Spec.UserLabels[config.LABEL_PGPOOL] = "false"
err = kubeapi.Updatepgcluster(restclient, &pgcluster, pgcluster.Name, namespace)
if err != nil {
log.Error(err)
}
log.Debugf("delete pgpool from cluster [%s]", clusterName)
}
// ProcessPgpool ...
func AddPgpool(clientset *kubernetes.Clientset, cl *crv1.Pgcluster, namespace string, createService bool) error {
var doc bytes.Buffer
var err error
//handle user specified pgpool secret
var secretName string
primaryName := cl.Spec.Name
replicaName := cl.Spec.Name + "-replica"
if cl.Spec.UserLabels[config.LABEL_PGPOOL_SECRET] != "" {
secretName = cl.Spec.UserLabels[config.LABEL_PGPOOL_SECRET]
log.Debugf("pgpool secret %s specifed by user", secretName)
} else {
//generate a secret for pgpool using the testuser credential
secretName = cl.Spec.Name + "-" + config.LABEL_PGPOOL_SECRET
err = CreatePgpoolSecret(clientset, primaryName, replicaName, primaryName, secretName, namespace)
if err != nil {
log.Error(err)
return err
}
log.Debug("pgpool secret created")
}
clusterName := cl.Spec.Name
pgpoolName := clusterName + PGPOOL_SUFFIX
log.Debugf("adding a pgpool %s", pgpoolName)
//create the pgpool deployment
fields := PgpoolTemplateFields{
Name: pgpoolName,
ClusterName: clusterName,
CCPImagePrefix: operator.Pgo.Cluster.CCPImagePrefix,
CCPImageTag: cl.Spec.CCPImageTag,
Port: operator.Pgo.Cluster.Port,
SecretsName: secretName,
ContainerResources: "",
}
if operator.Pgo.DefaultPgpoolResources != "" {
tmp, err := operator.Pgo.GetContainerResource(operator.Pgo.DefaultPgpoolResources)
if err != nil {
log.Error(err)
return err
}
fields.ContainerResources = operator.GetContainerResourcesJSON(&tmp)
}
err = config.PgpoolTemplate.Execute(&doc, fields)
if err != nil {
log.Error(err)
return err
}
if operator.CRUNCHY_DEBUG {
config.PgpoolTemplate.Execute(os.Stdout, fields)
}
deployment := appsv1.Deployment{}
err = json.Unmarshal(doc.Bytes(), &deployment)
if err != nil {
log.Error("error unmarshalling pgpool json into Deployment " + err.Error())
return err
}
err = kubeapi.CreateDeployment(clientset, &deployment, namespace)
if err != nil {
log.Error("error creating pgpool Deployment " + err.Error())
return err
}
if createService {
//create a service for the pgpool
svcFields := ServiceTemplateFields{}
svcFields.Name = pgpoolName
svcFields.ServiceName = pgpoolName
svcFields.ClusterName = clusterName
svcFields.Port = operator.Pgo.Cluster.Port
err = CreateService(clientset, &svcFields, namespace)
if err != nil {
log.Error(err)
return err
}
}
return err
}
// DeletePgpool
func DeletePgpool(clientset *kubernetes.Clientset, clusterName, namespace string) {
pgpoolDepName := clusterName + "-pgpool"
kubeapi.DeleteDeployment(clientset, pgpoolDepName, namespace)
//delete the service name=<clustename>-pgpool
kubeapi.DeleteService(clientset, pgpoolDepName, namespace)
}
// CreatePgpoolSecret create a secret used by pgpool
func CreatePgpoolSecret(clientset *kubernetes.Clientset, primary, replica, db, secretName, namespace string) error {
var username, password string
var pgpoolHBABytes, pgpoolConfBytes, pgpoolPasswdBytes []byte
_, found, err := kubeapi.GetSecret(clientset, secretName, namespace)
if found {
log.Debugf("pgpool secret %s already present, will reuse", secretName)
return err
}
pgpoolHBABytes, err = getPgpoolHBA()
if err != nil {
log.Error(err)
return err
}
pgpoolPasswdBytes, username, password, err = getPgpoolPasswd(clientset, namespace, db)
if err != nil {
log.Error(err)
return err
}
pgpoolConfBytes, err = getPgpoolConf(primary, replica, username, password)
if err != nil {
log.Error(err)
return err
}
secret := v1.Secret{}
secret.Name = secretName
secret.ObjectMeta.Labels = make(map[string]string)
secret.ObjectMeta.Labels[config.LABEL_PG_CLUSTER] = db
secret.ObjectMeta.Labels[config.LABEL_PGPOOL] = "true"
secret.Data = make(map[string][]byte)
secret.Data["pgpool.conf"] = pgpoolConfBytes
secret.Data["pool_hba.conf"] = pgpoolHBABytes
secret.Data["pool_passwd"] = pgpoolPasswdBytes
err = kubeapi.CreateSecret(clientset, &secret, namespace)
return err
}
func getPgpoolHBA() ([]byte, error) {
var err error
fields := PgpoolHBAFields{}
var doc bytes.Buffer
err = config.PgpoolHBATemplate.Execute(&doc, fields)
if err != nil {
log.Error(err)
return doc.Bytes(), err
}
log.Debug(doc.String())
return doc.Bytes(), err
}
func getPgpoolConf(primary, replica, username, password string) ([]byte, error) {
var err error
fields := PgpoolConfFields{}
fields.PG_PRIMARY_SERVICE_NAME = primary
fields.PG_REPLICA_SERVICE_NAME = replica
fields.PG_USERNAME = username
fields.PG_PASSWORD = password
var doc bytes.Buffer
err = config.PgpoolConfTemplate.Execute(&doc, fields)
if err != nil {
log.Error(err)
return doc.Bytes(), err
}
log.Debug(doc.String())
return doc.Bytes(), err
}
func getPgpoolPasswd(clientset *kubernetes.Clientset, namespace, clusterName string) ([]byte, string, string, error) {
var doc bytes.Buffer
var pgpoolUsername, pgpoolPassword string
//go get all non-pgpool secrets
selector := config.LABEL_PG_CLUSTER + "=" + clusterName + "," + config.LABEL_PGPOOL + "!=true"
secrets, err := kubeapi.GetSecrets(clientset, selector, namespace)
if err != nil {
log.Error(err)
return doc.Bytes(), pgpoolUsername, pgpoolPassword, err
}
creds := make([]PgpoolPasswdFields, 0)
for _, sec := range secrets.Items {
//log.Debugf("in pgpool passwd with username=%s password=%s\n", sec.Data[config.LABEL_USERNAME][:], sec.Data[config.LABEL_PASSWORD][:])
username := string(sec.Data[config.LABEL_USERNAME][:])
password := string(sec.Data[config.LABEL_PASSWORD][:])
c := PgpoolPasswdFields{}
c.Username = username
c.Password = "md5" + util.GetMD5HashForAuthFile(password+username)
creds = append(creds, c)
//we will use the postgres user for pgpool to auth with
if username == "postgres" {
pgpoolUsername = username
pgpoolPassword = password
}
}
err = config.PgpoolPasswdTemplate.Execute(&doc, creds)
if err != nil {
log.Error(err)
return doc.Bytes(), pgpoolUsername, pgpoolPassword, err
}
log.Debug(doc.String())
return doc.Bytes(), pgpoolUsername, pgpoolPassword, err
}