package client // import "github.com/docker/docker/client" import ( "context" "encoding/json" "net/url" "time" "github.com/docker/docker/api/types" "github.com/docker/docker/api/types/events" "github.com/docker/docker/api/types/filters" timetypes "github.com/docker/docker/api/types/time" ) // Events returns a stream of events in the daemon. It's up to the caller to close the stream // by cancelling the context. Once the stream has been completely read an io.EOF error will // be sent over the error channel. If an error is sent all processing will be stopped. It's up // to the caller to reopen the stream in the event of an error by reinvoking this method. func (cli *Client) Events(ctx context.Context, options types.EventsOptions) (<-chan events.Message, <-chan error) { messages := make(chan events.Message) errs := make(chan error, 1) started := make(chan struct{}) go func() { defer close(errs) query, err := buildEventsQueryParams(cli.version, options) if err != nil { close(started) errs <- err return } resp, err := cli.get(ctx, "/events", query, nil) if err != nil { close(started) errs <- err return } defer resp.body.Close() decoder := json.NewDecoder(resp.body) close(started) for { select { case <-ctx.Done(): errs <- ctx.Err() return default: var event events.Message if err := decoder.Decode(&event); err != nil { errs <- err return } select { case messages <- event: case <-ctx.Done(): errs <- ctx.Err() return } } } }() <-started return messages, errs } func buildEventsQueryParams(cliVersion string, options types.EventsOptions) (url.Values, error) { query := url.Values{} ref := time.Now() if options.Since != "" { ts, err := timetypes.GetTimestamp(options.Since, ref) if err != nil { return nil, err } query.Set("since", ts) } if options.Until != "" { ts, err := timetypes.GetTimestamp(options.Until, ref) if err != nil { return nil, err } query.Set("until", ts) } if options.Filters.Len() > 0 { filterJSON, err := filters.ToParamWithVersion(cliVersion, options.Filters) if err != nil { return nil, err } query.Set("filters", filterJSON) } return query, nil }