Reads all commits into memory!
(revs []string)
| 35 | |
| 36 | // Reads all commits into memory! |
| 37 | func (b JSONBackend) Get(revs []string) (iter.Seq[git.Commit], func() error) { |
| 38 | lookingFor := map[string]bool{} |
| 39 | for _, rev := range revs { |
| 40 | lookingFor[rev] = true |
| 41 | } |
| 42 | |
| 43 | var iterErr error |
| 44 | empty := slices.Values([]git.Commit{}) |
| 45 | finish := func() error { |
| 46 | return iterErr |
| 47 | } |
| 48 | |
| 49 | f, err := os.Open(b.Path) |
| 50 | if errors.Is(err, fs.ErrNotExist) { |
| 51 | // If file doesn't exist, don't treat as an error |
| 52 | return empty, finish |
| 53 | } else if err != nil { |
| 54 | iterErr = err |
| 55 | return empty, finish |
| 56 | } |
| 57 | defer f.Close() // Don't care about error closing when reading |
| 58 | |
| 59 | dec := json.NewDecoder(f) |
| 60 | |
| 61 | var commits []git.Commit |
| 62 | |
| 63 | // In theory we shouldn't get any duplicates into the cache if we're |
| 64 | // careful about what we write to it. But let's make sure by detecting dups |
| 65 | // and throwing an error if we see one. |
| 66 | seen := map[string]bool{} |
| 67 | |
| 68 | for { |
| 69 | var c git.Commit |
| 70 | |
| 71 | err = dec.Decode(&c) |
| 72 | if err == io.EOF { |
| 73 | break |
| 74 | } else if err != nil { |
| 75 | iterErr = err |
| 76 | return slices.Values(commits), finish |
| 77 | } |
| 78 | |
| 79 | hit, _ := lookingFor[c.Hash] |
| 80 | if hit { |
| 81 | if isDup, _ := seen[c.Hash]; isDup { |
| 82 | iterErr = fmt.Errorf( |
| 83 | "duplicate commit in cache: %s", |
| 84 | c.Hash, |
| 85 | ) |
| 86 | return slices.Values(commits), finish |
| 87 | } |
| 88 | |
| 89 | seen[c.Hash] = true |
| 90 | commits = append(commits, c) |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | return slices.Values(commits), finish |