97 lines
2.4 KiB
Go
97 lines
2.4 KiB
Go
package patroni
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/json"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"net/http"
|
|
"time"
|
|
|
|
"github.com/Sirupsen/logrus"
|
|
"k8s.io/client-go/pkg/api/v1"
|
|
)
|
|
|
|
const (
|
|
failoverPath = "/failover"
|
|
configPath = "/config"
|
|
apiPort = 8008
|
|
timeout = 30 * time.Second
|
|
)
|
|
|
|
// Interface describe patroni methods
|
|
type Interface interface {
|
|
Switchover(master *v1.Pod, candidate string) error
|
|
SetPostgresParameters(server *v1.Pod, options map[string]string) error
|
|
}
|
|
|
|
// Patroni API client
|
|
type Patroni struct {
|
|
httpClient *http.Client
|
|
logger *logrus.Entry
|
|
}
|
|
|
|
// New create patroni
|
|
func New(logger *logrus.Entry) *Patroni {
|
|
cl := http.Client{
|
|
Timeout: timeout,
|
|
}
|
|
|
|
return &Patroni{
|
|
logger: logger,
|
|
httpClient: &cl,
|
|
}
|
|
}
|
|
|
|
func apiURL(masterPod *v1.Pod) string {
|
|
return fmt.Sprintf("http://%s:%d", masterPod.Status.PodIP, apiPort)
|
|
}
|
|
|
|
func (p *Patroni) httpPostOrPatch(method string, url string, body *bytes.Buffer) error {
|
|
request, err := http.NewRequest(method, url, body)
|
|
if err != nil {
|
|
return fmt.Errorf("could not create request: %v", err)
|
|
}
|
|
|
|
p.logger.Debugf("making %s http request: %s", method, request.URL.String())
|
|
|
|
resp, err := p.httpClient.Do(request)
|
|
if err != nil {
|
|
return fmt.Errorf("could not make request: %v", err)
|
|
}
|
|
defer resp.Body.Close()
|
|
|
|
if resp.StatusCode != http.StatusOK {
|
|
bodyBytes, err := ioutil.ReadAll(resp.Body)
|
|
if err != nil {
|
|
return fmt.Errorf("could not read response: %v", err)
|
|
}
|
|
|
|
return fmt.Errorf("patroni returned '%s'", string(bodyBytes))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Switchover by calling Patroni REST API
|
|
func (p *Patroni) Switchover(master *v1.Pod, candidate string) error {
|
|
buf := &bytes.Buffer{}
|
|
err := json.NewEncoder(buf).Encode(map[string]string{"leader": master.Name, "member": candidate})
|
|
if err != nil {
|
|
return fmt.Errorf("could not encode json: %v", err)
|
|
}
|
|
return p.httpPostOrPatch(http.MethodPost, apiURL(master)+failoverPath, buf)
|
|
|
|
return nil
|
|
}
|
|
|
|
//TODO: add an option call /patroni to check if it is necessary to restart the server
|
|
// SetPostgresParameters sets Postgres options via Patroni patch API call.
|
|
func (p *Patroni) SetPostgresParameters(server *v1.Pod, parameters map[string]string) error {
|
|
buf := &bytes.Buffer{}
|
|
err := json.NewEncoder(buf).Encode(map[string]map[string]interface{}{"postgresql": {"parameters": parameters}})
|
|
if err != nil {
|
|
return fmt.Errorf("could not encode json: %v", err)
|
|
}
|
|
return p.httpPostOrPatch(http.MethodPatch, apiURL(server)+configPath, buf)
|
|
}
|