vole

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Read one request, or one commit, instead of resolving twice

c9202f7f0ba5904af798e7f55bb91079aa774bf5 · Keenan Nemetz · 10d ago · parent 73ec800b

Read one request, or one commit, instead of resolving twice

The index and the change page both paid for reads they did not need:

- GetRequest read every request on the branch to return one. It now reads
  that request's files.
- The index resolves the metadata commit once and then handed the ref to
  loaders that resolved it again. LoadIssuesAt, LoadNumbersAt and
  LoadRequestAt take the commit they were given.
- Release artifacts get a batched loader: one tree listing and one
  cat-file for the whole set, instead of one process per file per tag.

These are the loaders the index needs to derive its rows from one commit
at a time.

metadata/issues.go +15

@@ -139,6 +139,11 @@ func LoadIssues(g git.Repo, ref string) ([]Issue, error) {
	139	139	if err != nil {
	140	140	return nil, err
	141	141	}
		142	return LoadIssuesAt(g, commit)
		143	}
		144
		145	// LoadIssuesAt reads every issue at a commit that has already been resolved.
		146	func LoadIssuesAt(g git.Repo, commit string) ([]Issue, error) {
	142	147	if commit == "" {
	143	148	return nil, nil
	144	149	}
@@ -160,6 +165,16 @@ func LoadIssueAt(g git.Repo, ref, id string) (Issue, bool, error) {
	160	165	if err != nil {
	161	166	return nil, false, err
	162	167	}
		168	return LoadIssueAtCommit(g, commit, id)
		169	}
		170
		171	// LoadIssueAtCommit reads one issue and its comments at a commit that has
		172	// already been resolved. The index has the commit and must not resolve it again
		173	// per changed issue.
		174	func LoadIssueAtCommit(g git.Repo, commit, id string) (Issue, bool, error) {
		175	if !voleid.Valid(id) {
		176	return nil, false, nil
		177	}
	163	178	if commit == "" {
	164	179	return nil, false, nil
	165	180	}