| 1 | package corehttp |
| 2 | |
| 3 | import ( |
| 4 | "bufio" |
| 5 | "fmt" |
| 6 | "net" |
| 7 | "net/http" |
| 8 | |
| 9 | logging "github.com/ipfs/go-log/v2" |
| 10 | core "github.com/ipfs/kubo/core" |
| 11 | ) |
| 12 | |
| 13 | func LogOption() ServeOption { |
| 14 | return func(n *core.IpfsNode, _ net.Listener, mux *http.ServeMux) (*http.ServeMux, error) { |
| 15 | mux.HandleFunc("/logs", func(w http.ResponseWriter, r *http.Request) { |
| 16 | // The log data comes from an io.Reader, and we need to constantly |
| 17 | // read from it and then write to the HTTP response. |
| 18 | pipeReader := logging.NewPipeReader() |
| 19 | done := make(chan struct{}) |
| 20 | |
| 21 | // Close the pipe reader if the request context is canceled. This |
| 22 | // is necessary to avoiding blocking on reading from the pipe |
| 23 | // reader when the client terminates the request. |
| 24 | go func() { |
| 25 | select { |
| 26 | case <-r.Context().Done(): // Client canceled request |
| 27 | case <-n.Context().Done(): // Node shutdown |
| 28 | case <-done: // log reader goroutine exitex |
| 29 | } |
| 30 | pipeReader.Close() |
| 31 | }() |
| 32 | |
| 33 | errs := make(chan error, 1) |
| 34 | |
| 35 | go func() { |
| 36 | defer close(errs) |
| 37 | defer close(done) |
| 38 | |
| 39 | rdr := bufio.NewReader(pipeReader) |
| 40 | for { |
| 41 | // Read a line of log data and send it to the client. |
| 42 | line, err := rdr.ReadString('\n') |
| 43 | if err != nil { |
| 44 | errs <- fmt.Errorf("error reading log message: %s", err) |
| 45 | return |
| 46 | } |
| 47 | _, err = w.Write([]byte(line)) |
| 48 | if err != nil { |
| 49 | // Failed to write to client, probably disconnected. |
| 50 | return |
| 51 | } |
| 52 | if f, ok := w.(http.Flusher); ok { |
| 53 | f.Flush() |
| 54 | } |
| 55 | if r.Context().Err() != nil { |
| 56 | return |
| 57 | } |
| 58 | } |
| 59 | }() |
| 60 | log.Info("log API client connected") |
| 61 | err := <-errs |
| 62 | if err != nil { |
| 63 | http.Error(w, err.Error(), http.StatusInternalServerError) |
| 64 | return |
| 65 | } |
| 66 | }) |
| 67 | return mux, nil |
| 68 | } |
| 69 | } |