Method getRevisionBody

db/revtree.go:418–450

(revid string, loader RevLoaderFunc)

}

func (tree RevTree) getRevisionBody(revid string, loader RevLoaderFunc) ([]byte, bool) {
	if revid == "" {
		// TODO: CBG-1948
		panic("Illegal empty revision ID")
	}
	info, found := tree[revid]
	if !found {
		return nil, false
	}

	// If we don't have a Body in memory and there's a BodyKey present, attempt to retrieve using the loader
	if info.Body == nil && info.BodyKey != "" {
		if info.BodyKey != "" {
			var err error
			info.Body, err = loader(info.BodyKey)
			if err != nil {
				return nil, false
			}
		}
	}

	// Handling for data affected by https://github.com/couchbase/sync_gateway/issues/3692
	// In that scenario, the revision history includes an entry that should have been moved to a transient
	// backup and removed from the rev tree, and the revtree version was modified to include a leading non-JSON byte.
	// We ignore these rev history entries, meaning that callers will see the same view of the data
	// as if the transient backup had expired. We are not attempting to repair the rev tree, as reclaiming storage
	// is a much lower priority than avoiding write errors, and want to avoid introducing additional conflict scenarios.
	// The invalid rev tree bodies will eventually be pruned through normal revision tree pruning.
	if len(info.Body) > 0 && nonJSONPrefix(info.Body[0]) == nonJSONPrefixKindRevBody {
		return nil, false
	}
	return info.Body, true
}

func (tree RevTree) setRevisionBody(revid string, body []byte, bodyKey string, hasAttachments bool) {
	if revid == "" {