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| | 1 | +// SPDX-License-Identifier: AGPL-3.0-or-later |
| | 2 | + |
| | 3 | +package repos |
| | 4 | + |
| | 5 | +import ( |
| | 6 | + "context" |
| | 7 | + "errors" |
| | 8 | + "regexp" |
| | 9 | + "strings" |
| | 10 | + |
| | 11 | + reposdb "github.com/tenseleyFlow/shithub/internal/repos/sqlc" |
| | 12 | +) |
| | 13 | + |
| | 14 | +// MaxTopicsPerRepo and MaxTopicLength match the spec's day-1 lean |
| | 15 | +// (20 topics, 50 chars each). The shape regex covers GitHub's topic |
| | 16 | +// rules: lowercase letters/digits/hyphens, can't start/end with a |
| | 17 | +// hyphen, 1–50 chars. |
| | 18 | +const ( |
| | 19 | + MaxTopicsPerRepo = 20 |
| | 20 | + MaxTopicLength = 50 |
| | 21 | +) |
| | 22 | + |
| | 23 | +// Errors surfaced by topic mutation. |
| | 24 | +var ( |
| | 25 | + ErrTooManyTopics = errors.New("repos: too many topics (max 20)") |
| | 26 | + ErrInvalidTopic = errors.New("repos: topic must be lowercase letters, digits, and hyphens; 1-50 chars") |
| | 27 | +) |
| | 28 | + |
| | 29 | +var topicRE = regexp.MustCompile(`^[a-z0-9](?:[a-z0-9-]{0,48}[a-z0-9])?$`) |
| | 30 | + |
| | 31 | +// NormalizeTopics dedups + lowercases an incoming list and validates |
| | 32 | +// each entry. Returns the cleaned slice (stable-ordered, dedup'd) or |
| | 33 | +// the first validation error. |
| | 34 | +func NormalizeTopics(raw []string) ([]string, error) { |
| | 35 | + seen := map[string]struct{}{} |
| | 36 | + out := make([]string, 0, len(raw)) |
| | 37 | + for _, t := range raw { |
| | 38 | + t = strings.ToLower(strings.TrimSpace(t)) |
| | 39 | + if t == "" { |
| | 40 | + continue |
| | 41 | + } |
| | 42 | + if !topicRE.MatchString(t) { |
| | 43 | + return nil, ErrInvalidTopic |
| | 44 | + } |
| | 45 | + if _, dup := seen[t]; dup { |
| | 46 | + continue |
| | 47 | + } |
| | 48 | + seen[t] = struct{}{} |
| | 49 | + out = append(out, t) |
| | 50 | + } |
| | 51 | + if len(out) > MaxTopicsPerRepo { |
| | 52 | + return nil, ErrTooManyTopics |
| | 53 | + } |
| | 54 | + return out, nil |
| | 55 | +} |
| | 56 | + |
| | 57 | +// ReplaceTopics atomically swaps the topic set for a repo. The |
| | 58 | +// orchestrator owns tx ordering: DELETE + per-row INSERT in one tx |
| | 59 | +// so a partial failure rolls back. The unique index on (repo_id, |
| | 60 | +// topic) makes the inserts idempotent against a concurrent run. |
| | 61 | +func ReplaceTopics(ctx context.Context, deps Deps, repoID int64, topics []string) error { |
| | 62 | + clean, err := NormalizeTopics(topics) |
| | 63 | + if err != nil { |
| | 64 | + return err |
| | 65 | + } |
| | 66 | + tx, err := deps.Pool.Begin(ctx) |
| | 67 | + if err != nil { |
| | 68 | + return err |
| | 69 | + } |
| | 70 | + committed := false |
| | 71 | + defer func() { |
| | 72 | + if !committed { |
| | 73 | + _ = tx.Rollback(ctx) |
| | 74 | + } |
| | 75 | + }() |
| | 76 | + q := reposdb.New() |
| | 77 | + if err := q.ReplaceRepoTopics(ctx, tx, repoID); err != nil { |
| | 78 | + return err |
| | 79 | + } |
| | 80 | + for _, t := range clean { |
| | 81 | + if err := q.InsertRepoTopic(ctx, tx, reposdb.InsertRepoTopicParams{ |
| | 82 | + RepoID: repoID, Topic: t, |
| | 83 | + }); err != nil { |
| | 84 | + return err |
| | 85 | + } |
| | 86 | + } |
| | 87 | + if err := tx.Commit(ctx); err != nil { |
| | 88 | + return err |
| | 89 | + } |
| | 90 | + committed = true |
| | 91 | + return nil |
| | 92 | +} |
