| 194 | } |
| 195 | |
| 196 | func readFile(path string, out map[string][]string) error { |
| 197 | f, err := os.Open(path) |
| 198 | if err != nil { |
| 199 | return err |
| 200 | } |
| 201 | |
| 202 | scnr := bufio.NewScanner(f) |
| 203 | lineCounter := 0 |
| 204 | |
| 205 | parseErr := func(text string) error { |
| 206 | return fmt.Errorf("%s:%d: %s", path, lineCounter, text) |
| 207 | } |
| 208 | |
| 209 | for scnr.Scan() { |
| 210 | lineCounter++ |
| 211 | if strings.HasPrefix(scnr.Text(), "#") { |
| 212 | continue |
| 213 | } |
| 214 | |
| 215 | text := strings.TrimSpace(scnr.Text()) |
| 216 | if text == "" { |
| 217 | continue |
| 218 | } |
| 219 | |
| 220 | parts := strings.SplitN(text, ":", 2) |
| 221 | if len(parts) == 1 { |
| 222 | parts = append(parts, "") |
| 223 | } |
| 224 | |
| 225 | from := strings.TrimSpace(parts[0]) |
| 226 | if len(from) == 0 { |
| 227 | return parseErr("empty address before colon") |
| 228 | } |
| 229 | |
| 230 | for _, to := range strings.Split(parts[1], ",") { |
| 231 | to := strings.TrimSpace(to) |
| 232 | out[from] = append(out[from], to) |
| 233 | } |
| 234 | } |
| 235 | return scnr.Err() |
| 236 | } |
| 237 | |
| 238 | func (f *File) Lookup(_ context.Context, val string) (string, bool, error) { |
| 239 | // The existing map is never modified, instead it is replaced with a new |