126 lines
3.2 KiB
Go
126 lines
3.2 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"
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"net/http"
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"strconv"
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"time"
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"github.com/sirupsen/logrus"
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"k8s.io/api/core/v1"
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)
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const (
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failoverPath = "/failover"
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configPath = "/config"
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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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Switchover(master *v1.Pod, candidate string) error
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SetPostgresParameters(server *v1.Pod, options map[string]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 apiURL(masterPod *v1.Pod) (string, error) {
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ip := net.ParseIP(masterPod.Status.PodIP)
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if ip == nil {
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return "", fmt.Errorf("%s is not a valid IP", masterPod.Status.PodIP)
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}
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// Sanity check PodIP
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if ip.To4() == nil {
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if ip.To16() == nil {
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// Shouldn't ever get here, but library states it's possible.
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return "", fmt.Errorf("%s is not a valid IPv4/IPv6 address", masterPod.Status.PodIP)
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}
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}
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return fmt.Sprintf("http://%s", net.JoinHostPort(ip.String(), strconv.Itoa(apiPort))), nil
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}
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func (p *Patroni) httpPostOrPatch(method string, url string, body *bytes.Buffer) (err error) {
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request, err := http.NewRequest(method, url, body)
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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 %s http request: %s", method, 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 func() {
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if err2 := resp.Body.Close(); err2 != nil {
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if err != nil {
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err = fmt.Errorf("could not close request: %v, prior error: %v", err2, err)
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} else {
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err = fmt.Errorf("could not close request: %v", err2)
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}
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return
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}
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}()
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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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// Switchover by calling Patroni REST API
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func (p *Patroni) Switchover(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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apiURLString, err := apiURL(master)
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if err != nil {
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return err
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}
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return p.httpPostOrPatch(http.MethodPost, apiURLString+failoverPath, buf)
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}
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//TODO: add an option call /patroni to check if it is necessary to restart the server
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//SetPostgresParameters sets Postgres options via Patroni patch API call.
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func (p *Patroni) SetPostgresParameters(server *v1.Pod, parameters map[string]string) error {
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buf := &bytes.Buffer{}
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err := json.NewEncoder(buf).Encode(map[string]map[string]interface{}{"postgresql": {"parameters": parameters}})
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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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apiURLString, err := apiURL(server)
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if err != nil {
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return err
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}
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return p.httpPostOrPatch(http.MethodPatch, apiURLString+configPath, buf)
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}
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