125 lines
2.2 KiB
Go
125 lines
2.2 KiB
Go
package client
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import (
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"bufio"
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"context"
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"encoding/json"
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"errors"
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"net/http"
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"github.com/micro/go-micro/v2/util/kubernetes/api"
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)
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const (
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// EventTypes used
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Added EventType = "ADDED"
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Modified EventType = "MODIFIED"
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Deleted EventType = "DELETED"
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Error EventType = "ERROR"
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)
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// Watcher is used to watch for events
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type Watcher interface {
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// A channel of events
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Chan() <-chan Event
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// Stop the watcher
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Stop()
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}
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// EventType defines the possible types of events.
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type EventType string
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// Event represents a single event to a watched resource.
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type Event struct {
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Type EventType `json:"type"`
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Object json.RawMessage `json:"object"`
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}
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// bodyWatcher scans the body of a request for chunks
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type bodyWatcher struct {
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results chan Event
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cancel func()
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stop chan bool
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res *http.Response
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req *api.Request
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}
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// Changes returns the results channel
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func (wr *bodyWatcher) Chan() <-chan Event {
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return wr.results
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}
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// Stop cancels the request
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func (wr *bodyWatcher) Stop() {
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select {
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case <-wr.stop:
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return
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default:
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// cancel the request
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wr.cancel()
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// stop the watcher
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close(wr.stop)
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}
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}
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func (wr *bodyWatcher) stream() {
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reader := bufio.NewReader(wr.res.Body)
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go func() {
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for {
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// read a line
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b, err := reader.ReadBytes('\n')
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if err != nil {
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return
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}
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// send the event
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var event Event
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if err := json.Unmarshal(b, &event); err != nil {
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continue
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}
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select {
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case <-wr.stop:
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return
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case wr.results <- event:
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}
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}
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}()
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}
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// newWatcher creates a k8s body watcher for
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// a given http request
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func newWatcher(req *api.Request) (Watcher, error) {
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// set request context so we can cancel the request
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ctx, cancel := context.WithCancel(context.Background())
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req.Context(ctx)
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// do the raw request
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res, err := req.Raw()
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if err != nil {
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cancel()
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return nil, err
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}
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if res.StatusCode < 200 || res.StatusCode >= 300 {
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cancel()
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// close the response body
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res.Body.Close()
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// return an error
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return nil, errors.New(res.Request.URL.String() + ": " + res.Status)
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}
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wr := &bodyWatcher{
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results: make(chan Event),
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stop: make(chan bool),
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cancel: cancel,
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req: req,
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res: res,
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}
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go wr.stream()
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return wr, nil
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}
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