download starts or resumes and download. dlFile is expected to be an existing file open in RW mode
(t *Transfer, cb ProgressCallback, authOkFunc func(), dlFile *os.File, fromByte int64, hash hash.Hash)
| 113 | |
| 114 | // download starts or resumes and download. dlFile is expected to be an existing file open in RW mode |
| 115 | func (a *basicDownloadAdapter) download(t *Transfer, cb ProgressCallback, authOkFunc func(), dlFile *os.File, fromByte int64, hash hash.Hash) error { |
| 116 | rel, err := t.Rel("download") |
| 117 | if err != nil { |
| 118 | return err |
| 119 | } |
| 120 | if rel == nil { |
| 121 | return errors.New(tr.Tr.Get("Object %s not found on the server.", t.Oid)) |
| 122 | } |
| 123 | |
| 124 | req, err := a.newHTTPRequest("GET", rel) |
| 125 | if err != nil { |
| 126 | return err |
| 127 | } |
| 128 | |
| 129 | if fromByte > 0 { |
| 130 | // We could just use a start byte, but since we know the length be specific |
| 131 | req.Header.Set("Range", fmt.Sprintf("bytes=%d-%d", fromByte, t.Size-1)) |
| 132 | } |
| 133 | |
| 134 | req = a.apiClient.LogRequest(req, "lfs.data.download") |
| 135 | res, err := a.makeRequest(t, req) |
| 136 | if err != nil { |
| 137 | if res == nil { |
| 138 | // We encountered a network or similar error which caused us |
| 139 | // to not receive a response at all. |
| 140 | return errors.NewRetriableError(err) |
| 141 | } |
| 142 | |
| 143 | // Special-case status code 416 () - fall back |
| 144 | if fromByte > 0 && dlFile != nil && res.StatusCode == 416 { |
| 145 | tracerx.Printf("xfer: server rejected resume download request for %q from byte %d; re-downloading from start", t.Oid, fromByte) |
| 146 | if _, err := dlFile.Seek(0, io.SeekStart); err != nil { |
| 147 | return err |
| 148 | } |
| 149 | if err := dlFile.Truncate(0); err != nil { |
| 150 | return err |
| 151 | } |
| 152 | return a.download(t, cb, authOkFunc, dlFile, 0, nil) |
| 153 | } |
| 154 | |
| 155 | // Special-cae status code 429 - retry after certain time |
| 156 | if res.StatusCode == 429 { |
| 157 | retLaterErr := errors.NewRetriableLaterError(err, res.Header.Get("Retry-After")) |
| 158 | if retLaterErr != nil { |
| 159 | return retLaterErr |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | return errors.NewRetriableError(err) |
| 164 | } |
| 165 | |
| 166 | defer res.Body.Close() |
| 167 | |
| 168 | // Range request must return 206 & content range to confirm |
| 169 | if fromByte > 0 { |
| 170 | rangeRequestOk := false |
| 171 | var failReason string |
| 172 | // check 206 and Content-Range, fall back if either not as expected |
no test coverage detected