// syncedErrs couples GoPath's error handling with errStore's error handling.
// When the GoPath contained an error, it will be stored in the errStore, so
// that all following ops become no-ops.
// When however the errStore contains an error, an errorneous GoPath will be
// returned.
func (s *errStore) syncedErrs(p gopath.GoPath) gopath.GoPath {
if s.hasErr() {
return gopath.FromErr(s.err)
}
if p.HasErr() {
s.setErr(p.Err())
}
return p
}
// pathFromRequest maps the request to the filesystem.
// It returns a GoPath that might be errorneous.
func (i *pathIO) pathFromRequest(request *http.Request) gopath.GoPath {
if i.hasErr() {
return gopath.FromErr(i.err)
}
var p = i.contentRoot.JoinPath(request.URL.Path).Do(i.normalizePath).Do(i.guessExtension)
if !p.HasErr() && p.IsDirectory() {
return i.indexForDirectory(p)
}
return i.syncedErrs(p.PrependErr("couldn't retrieve path from request"))
}