mirror of https://github.com/docker/docs.git
137 lines
2.8 KiB
Go
137 lines
2.8 KiB
Go
package token
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"net/http"
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"strings"
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"time"
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"github.com/docker/swarm/discovery"
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)
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// DiscoveryUrl is exported
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const DiscoveryURL = "https://discovery-stage.hub.docker.com/v1"
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// Discovery is exported
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type Discovery struct {
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heartbeat time.Duration
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url string
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token string
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}
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func init() {
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discovery.Register("token", &Discovery{})
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}
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// Initialize is exported
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func (s *Discovery) Initialize(urltoken string, heartbeat time.Duration) error {
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if i := strings.LastIndex(urltoken, "/"); i != -1 {
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s.url = "https://" + urltoken[:i]
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s.token = urltoken[i+1:]
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} else {
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s.url = DiscoveryURL
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s.token = urltoken
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}
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if s.token == "" {
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return errors.New("token is empty")
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}
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s.heartbeat = heartbeat
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return nil
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}
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// Fetch returns the list of entries for the discovery service at the specified endpoint
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func (s *Discovery) fetch() (discovery.Entries, error) {
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resp, err := http.Get(fmt.Sprintf("%s/%s/%s", s.url, "clusters", s.token))
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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var addrs []string
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if resp.StatusCode == http.StatusOK {
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if err := json.NewDecoder(resp.Body).Decode(&addrs); err != nil {
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return nil, fmt.Errorf("Failed to decode response: %v", err)
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}
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} else {
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return nil, fmt.Errorf("Failed to fetch entries, Discovery service returned %d HTTP status code", resp.StatusCode)
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}
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return discovery.CreateEntries(addrs)
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}
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// Watch is exported
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func (s *Discovery) Watch(stopCh <-chan struct{}) (<-chan discovery.Entries, <-chan error) {
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ch := make(chan discovery.Entries)
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ticker := time.NewTicker(s.heartbeat)
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errCh := make(chan error)
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go func() {
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defer close(ch)
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defer close(errCh)
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// Send the initial entries if available.
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currentEntries, err := s.fetch()
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if err != nil {
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errCh <- err
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} else {
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ch <- currentEntries
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}
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// Periodically send updates.
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for {
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select {
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case <-ticker.C:
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newEntries, err := s.fetch()
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if err != nil {
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errCh <- err
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continue
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}
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// Check if the file has really changed.
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if !newEntries.Equals(currentEntries) {
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ch <- newEntries
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}
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currentEntries = newEntries
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case <-stopCh:
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ticker.Stop()
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return
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}
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}
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}()
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return ch, nil
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}
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// Register adds a new entry identified by the into the discovery service
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func (s *Discovery) Register(addr string) error {
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buf := strings.NewReader(addr)
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resp, err := http.Post(fmt.Sprintf("%s/%s/%s", s.url,
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"clusters", s.token), "application/json", buf)
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if err != nil {
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return err
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}
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resp.Body.Close()
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return nil
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}
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// CreateCluster returns a unique cluster token
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func (s *Discovery) CreateCluster() (string, error) {
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resp, err := http.Post(fmt.Sprintf("%s/%s", s.url, "clusters"), "", nil)
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if err != nil {
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return "", err
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}
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defer resp.Body.Close()
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token, err := ioutil.ReadAll(resp.Body)
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return string(token), err
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}
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