NewBinaryProcessor returns a binary processor for use with processing content streams
(ctx context.Context, imt, rmt string, stream StreamProcessor, name string, args, env []string, payload typeurl.Any)
| 34 | |
| 35 | // NewBinaryProcessor returns a binary processor for use with processing content streams |
| 36 | func NewBinaryProcessor(ctx context.Context, imt, rmt string, stream StreamProcessor, name string, args, env []string, payload typeurl.Any) (StreamProcessor, error) { |
| 37 | cmd := exec.CommandContext(ctx, name, args...) |
| 38 | cmd.Env = os.Environ() |
| 39 | cmd.Env = append(cmd.Env, env...) |
| 40 | |
| 41 | var payloadC io.Closer |
| 42 | if payload != nil { |
| 43 | pb := typeurl.MarshalProto(payload) |
| 44 | data, err := proto.Marshal(pb) |
| 45 | if err != nil { |
| 46 | return nil, err |
| 47 | } |
| 48 | r, w, err := os.Pipe() |
| 49 | if err != nil { |
| 50 | return nil, err |
| 51 | } |
| 52 | go func() { |
| 53 | io.Copy(w, bytes.NewReader(data)) |
| 54 | w.Close() |
| 55 | }() |
| 56 | |
| 57 | cmd.ExtraFiles = append(cmd.ExtraFiles, r) |
| 58 | payloadC = r |
| 59 | } |
| 60 | cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", mediaTypeEnvVar, imt)) |
| 61 | var ( |
| 62 | stdin io.Reader |
| 63 | closer func() error |
| 64 | err error |
| 65 | ) |
| 66 | if f, ok := stream.(RawProcessor); ok { |
| 67 | stdin = f.File() |
| 68 | closer = f.File().Close |
| 69 | } else { |
| 70 | stdin = stream |
| 71 | } |
| 72 | cmd.Stdin = stdin |
| 73 | r, w, err := os.Pipe() |
| 74 | if err != nil { |
| 75 | return nil, err |
| 76 | } |
| 77 | cmd.Stdout = w |
| 78 | |
| 79 | stderr := bytes.NewBuffer(nil) |
| 80 | cmd.Stderr = stderr |
| 81 | |
| 82 | if err := cmd.Start(); err != nil { |
| 83 | return nil, err |
| 84 | } |
| 85 | p := &binaryProcessor{ |
| 86 | cmd: cmd, |
| 87 | r: r, |
| 88 | mt: rmt, |
| 89 | stderr: stderr, |
| 90 | done: make(chan struct{}), |
| 91 | } |
| 92 | go p.wait() |
| 93 |