81 lines
1.7 KiB
Go
81 lines
1.7 KiB
Go
package patroni
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"time"
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"github.com/Sirupsen/logrus"
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"k8s.io/client-go/pkg/api/v1"
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)
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const (
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failoverPath = "/failover"
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apiPort = 8008
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timeout = 30 * time.Second
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)
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// Interface describe patroni methods
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type Interface interface {
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Failover(master *v1.Pod, candidate string) error
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}
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// Patroni API client
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type Patroni struct {
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httpClient *http.Client
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logger *logrus.Entry
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}
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// New create patroni
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func New(logger *logrus.Entry) *Patroni {
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cl := http.Client{
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Timeout: timeout,
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}
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return &Patroni{
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logger: logger,
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httpClient: &cl,
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}
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}
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func (p *Patroni) apiURL(masterPod *v1.Pod) string {
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return fmt.Sprintf("http://%s:%d", masterPod.Status.PodIP, apiPort)
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}
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// Failover does manual failover via patroni api
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func (p *Patroni) Failover(master *v1.Pod, candidate string) error {
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buf := &bytes.Buffer{}
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err := json.NewEncoder(buf).Encode(map[string]string{"leader": master.Name, "member": candidate})
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if err != nil {
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return fmt.Errorf("could not encode json: %v", err)
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}
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request, err := http.NewRequest(http.MethodPost, p.apiURL(master)+failoverPath, buf)
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if err != nil {
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return fmt.Errorf("could not create request: %v", err)
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}
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p.logger.Debugf("making http request: %s", request.URL.String())
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resp, err := p.httpClient.Do(request)
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if err != nil {
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return fmt.Errorf("could not make request: %v", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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bodyBytes, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return fmt.Errorf("could not read response: %v", err)
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}
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return fmt.Errorf("patroni returned '%s'", string(bodyBytes))
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}
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return nil
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}
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