| 1 | package console |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "context" |
| 6 | "encoding/json" |
| 7 | "errors" |
| 8 | "io" |
| 9 | "net/http" |
| 10 | "os" |
| 11 | "strings" |
| 12 | |
| 13 | "github.com/superfly/ltx" |
| 14 | |
| 15 | "github.com/carlosframework/platform/internal/dbdoor" |
| 16 | ) |
| 17 | |
| 18 | // replicaDoer serves the db door's two tails (ListTail, GetTail) from rd in |
| 19 | // process, so the console's own --from restore runs through |
| 20 | // dbdoor.RestoreToTarget: its retry, its private 0700 directory, its |
| 21 | // CheckDB, the same code carlos db pull runs (seeded-instances spec §4 |
| 22 | // step 6). The listing is the door's own (listReplicaLevel). |
| 23 | // |
| 24 | // It answers the status codes the client reads and no sentences: a tail |
| 25 | // that is not a coordinate, or a file that is not there, is a 404 (the |
| 26 | // client's os.ErrNotExist), and a range the door would refuse is a 416. |
| 27 | // A failed bucket read is returned as the error it is. |
| 28 | func replicaDoer(rd replicaReader) dbdoor.Doer { |
| 29 | return func(ctx context.Context, tail string, h http.Header) (*http.Response, error) { |
| 30 | rest, ok := strings.CutPrefix(tail, "/ltx/") |
| 31 | if !ok { |
| 32 | return doerResponse(http.StatusNotFound, nil), nil |
| 33 | } |
| 34 | parts := strings.Split(rest, "/") |
| 35 | level, ok := parseDBLevel(parts[0]) |
| 36 | if !ok || len(parts) > 2 { |
| 37 | return doerResponse(http.StatusNotFound, nil), nil |
| 38 | } |
| 39 | if len(parts) == 1 { |
| 40 | out, err := listReplicaLevel(ctx, rd, level) |
| 41 | if err != nil { |
| 42 | return nil, err |
| 43 | } |
| 44 | body, err := json.Marshal(out) |
| 45 | if err != nil { |
| 46 | return nil, err |
| 47 | } |
| 48 | return doerResponse(http.StatusOK, io.NopCloser(bytes.NewReader(body))), nil |
| 49 | } |
| 50 | lo, hi, err := dbdoor.ParseSpan(parts[1]) |
| 51 | if err != nil { |
| 52 | return doerResponse(http.StatusNotFound, nil), nil |
| 53 | } |
| 54 | off, size, err := dbdoor.ParseRange(h.Get("Range")) |
| 55 | if err != nil { |
| 56 | return doerResponse(http.StatusRequestedRangeNotSatisfiable, nil), nil |
| 57 | } |
| 58 | rc, err := rd.OpenLTXFile(ctx, level, ltx.TXID(lo), ltx.TXID(hi), off, size) |
| 59 | if errors.Is(err, os.ErrNotExist) { |
| 60 | return doerResponse(http.StatusNotFound, nil), nil |
| 61 | } |
| 62 | if err != nil { |
| 63 | return nil, err |
| 64 | } |
| 65 | code := http.StatusOK |
| 66 | if h.Get("Range") != "" { |
| 67 | code = http.StatusPartialContent |
| 68 | } |
| 69 | return doerResponse(code, rc), nil |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | // doerResponse is one in-process answer. A nil body is an empty one, so |
| 74 | // the client can always close what it is handed. |
| 75 | func doerResponse(code int, body io.ReadCloser) *http.Response { |
| 76 | if body == nil { |
| 77 | body = io.NopCloser(strings.NewReader("")) |
| 78 | } |
| 79 | return &http.Response{StatusCode: code, Header: http.Header{}, Body: body} |
| 80 | } |
| 81 | |
amadan