| 1 | package host |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "context" |
| 6 | "encoding/json" |
| 7 | "errors" |
| 8 | "fmt" |
| 9 | "io" |
| 10 | "net" |
| 11 | "net/http" |
| 12 | "time" |
| 13 | |
| 14 | execlease "github.com/carlosframework/platform/internal/hostexec" |
| 15 | ) |
| 16 | |
| 17 | func (h ClaimRootHTTP) serveExecution(w http.ResponseWriter, r *http.Request, peer StopPeer) { |
| 18 | var q execlease.ExecutionRequest |
| 19 | dec := json.NewDecoder(http.MaxBytesReader(w, r.Body, 16<<10)) |
| 20 | dec.DisallowUnknownFields() |
| 21 | if dec.Decode(&q) != nil || dec.Decode(new(any)) != io.EOF { |
| 22 | w.WriteHeader(http.StatusBadRequest) |
| 23 | return |
| 24 | } |
| 25 | if h.Execution == nil { |
| 26 | w.WriteHeader(http.StatusServiceUnavailable) |
| 27 | return |
| 28 | } |
| 29 | out, err := h.Execution.Execute(r.Context(), execlease.ControllerProcess{KernelBootID: peer.BootID, PID: peer.PID, Start: peer.ProcessStart}, q) |
| 30 | if errors.Is(err, errReinstallRetired) { |
| 31 | w.WriteHeader(http.StatusGone) |
| 32 | return |
| 33 | } |
| 34 | if err != nil { |
| 35 | w.WriteHeader(http.StatusConflict) |
| 36 | return |
| 37 | } |
| 38 | w.Header().Set("Content-Type", "application/json") |
| 39 | _ = json.NewEncoder(w).Encode(out) |
| 40 | } |
| 41 | |
| 42 | func rootExecutionClient(path string) func(context.Context, execlease.ExecutionRequest) (execlease.ExecutionResponse, error) { |
| 43 | return func(ctx context.Context, q execlease.ExecutionRequest) (execlease.ExecutionResponse, error) { |
| 44 | var out execlease.ExecutionResponse |
| 45 | raw, err := json.Marshal(q) |
| 46 | if err != nil { |
| 47 | return out, err |
| 48 | } |
| 49 | ctx, cancel := context.WithTimeout(ctx, 30*time.Second) |
| 50 | defer cancel() |
| 51 | tr := &http.Transport{DisableKeepAlives: true, DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) { |
| 52 | return (&net.Dialer{}).DialContext(ctx, "unix", path) |
| 53 | }} |
| 54 | defer tr.CloseIdleConnections() |
| 55 | for attempt := 0; attempt < 2; attempt++ { |
| 56 | req, e := http.NewRequestWithContext(ctx, http.MethodPost, "http://control/claim/execution", bytes.NewReader(raw)) |
| 57 | if e != nil { |
| 58 | return out, e |
| 59 | } |
| 60 | resp, e := (&http.Client{Transport: tr}).Do(req) |
| 61 | if e != nil { |
| 62 | err = e |
| 63 | continue |
| 64 | } |
| 65 | if resp.StatusCode == http.StatusGone { |
| 66 | resp.Body.Close() |
| 67 | return out, fmt.Errorf("%s: %w", q.Host, errReinstallRetired) |
| 68 | } |
| 69 | if resp.StatusCode != http.StatusOK { |
| 70 | resp.Body.Close() |
| 71 | return out, execlease.ErrLost |
| 72 | } |
| 73 | limited := &io.LimitedReader{R: resp.Body, N: (16 << 10) + 1} |
| 74 | dec := json.NewDecoder(limited) |
| 75 | dec.DisallowUnknownFields() |
| 76 | err = dec.Decode(&out) |
| 77 | if err == nil && (dec.Decode(new(any)) != io.EOF || limited.N == 0) { |
| 78 | err = execlease.ErrState |
| 79 | } |
| 80 | resp.Body.Close() |
| 81 | if err != nil { |
| 82 | continue |
| 83 | } |
| 84 | serving := q.Operation == "executionView" && q.Token == "" && out.Status == "serving" && out.Token == "" && out.SafeUntil == 0 && out.LeaseETag == "" && out.Expires.IsZero() |
| 85 | if q.Operation == "executionView" && q.Token == "" && !serving { |
| 86 | return execlease.ExecutionResponse{}, execlease.ErrState |
| 87 | } |
| 88 | if out.Schema != 1 || out.Host != q.Host || out.Incarnation != q.Incarnation || out.Stamp != q.Stamp || out.Session != q.Session || out.Op != q.Op || (!serving && out.Token == "") || out.BootID == "" { |
| 89 | return execlease.ExecutionResponse{}, execlease.ErrState |
| 90 | } |
| 91 | return out, nil |
| 92 | } |
| 93 | return out, err |
| 94 | } |
| 95 | } |
| 96 | |
amadan