func BuildSelectorFromConfig(
cfg *common.Config,
settings Settings,
) (Selector, error) {
var sel []SelectorExpr
key := settings.Key
multiKey := settings.MultiKey
found := false
if cfg.HasField(multiKey) {
found = true
sub, err := cfg.Child(multiKey, -1)
if err != nil {
return Selector{}, err
}
var table []*common.Config
if err := sub.Unpack(&table); err != nil {
return Selector{}, err
}
for _, config := range table {
action, err := buildSingle(config, key)
if err != nil {
return Selector{}, err
}
if action != nilSelector {
sel = append(sel, action)
}
}
}
if settings.EnableSingleOnly && cfg.HasField(key) {
found = true
// expect event-format-string
str, err := cfg.String(key, -1)
if err != nil {
return Selector{}, err
}
fmtstr, err := fmtstr.CompileEvent(str)
if err != nil {
return Selector{}, fmt.Errorf("%v in %v", err, cfg.PathOf(key))
}
if fmtstr.IsConst() {
str, err := fmtstr.Run(common.MapStr{})
if err != nil {
return Selector{}, err
}
if str != "" {
sel = append(sel, ConstSelectorExpr(str))
}
} else {
sel = append(sel, FmtSelectorExpr(fmtstr, ""))
}
}
if settings.FailEmpty && !found {
if settings.EnableSingleOnly {
return Selector{}, fmt.Errorf("missing required '%v' or '%v' in %v",
key, multiKey, cfg.Path())
}
return Selector{}, fmt.Errorf("missing required '%v' in %v",
multiKey, cfg.Path())
}
return MakeSelector(sel...), nil
}