(ctx context.Context, rc io.ReadCloser)
| 26 | ) |
| 27 | |
| 28 | func ServerSentEventReader(ctx context.Context, rc io.ReadCloser) func() (*ServerSentEvent, error) { |
| 29 | _, span := tracing.StartSpan(ctx) |
| 30 | defer span.End() |
| 31 | |
| 32 | reader := bufio.NewReader(rc) |
| 33 | nextLineValue := func(prefix string) ([]byte, error) { |
| 34 | var ( |
| 35 | line string |
| 36 | err error |
| 37 | ) |
| 38 | for { |
| 39 | line, err = reader.ReadString('\n') |
| 40 | if err != nil { |
| 41 | return nil, xerrors.Errorf("reading next string: %w", err) |
| 42 | } |
| 43 | if strings.TrimSpace(line) != "" { |
| 44 | break |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | if !strings.HasPrefix(line, fmt.Sprintf("%s: ", prefix)) { |
| 49 | return nil, xerrors.Errorf("expecting %s prefix, got: %s", prefix, line) |
| 50 | } |
| 51 | s := strings.TrimPrefix(line, fmt.Sprintf("%s: ", prefix)) |
| 52 | s = strings.TrimSpace(s) |
| 53 | return []byte(s), nil |
| 54 | } |
| 55 | |
| 56 | nextEvent := func() (*ServerSentEvent, error) { |
| 57 | for { |
| 58 | t, err := nextLineValue("event") |
| 59 | if err != nil { |
| 60 | return nil, xerrors.Errorf("reading next line value: %w", err) |
| 61 | } |
| 62 | |
| 63 | switch ServerSentEventType(t) { |
| 64 | case ServerSentEventTypePing: |
| 65 | return &ServerSentEvent{ |
| 66 | Type: ServerSentEventTypePing, |
| 67 | }, nil |
| 68 | case ServerSentEventTypeData: |
| 69 | d, err := nextLineValue("data") |
| 70 | if err != nil { |
| 71 | return nil, xerrors.Errorf("reading next line value: %w", err) |
| 72 | } |
| 73 | |
| 74 | return &ServerSentEvent{ |
| 75 | Type: ServerSentEventTypeData, |
| 76 | Data: d, |
| 77 | }, nil |
| 78 | case ServerSentEventTypeError: |
| 79 | d, err := nextLineValue("data") |
| 80 | if err != nil { |
| 81 | return nil, xerrors.Errorf("reading next line value: %w", err) |
| 82 | } |
| 83 | |
| 84 | return &ServerSentEvent{ |
| 85 | Type: ServerSentEventTypeError, |
no test coverage detected