func()

in prometheus/alert/client.go [208:229]

• 20 lines of code
• 5 McCabe index (conditional complexity)

func (c *client) ReadRules(filePrefix, ruleName string) ([]rulefmt.Rule, error) {
	filename := makeFilename(filePrefix)
	c.fileLocks.RLock(filename)
	defer c.fileLocks.RUnlock(filename)

	if !c.ruleFileExists(filename) {
		return []rulefmt.Rule{}, nil
	}

	ruleFile, err := c.readRuleFile(makeFilename(filePrefix))
	if err != nil {
		return []rulefmt.Rule{}, err
	}
	if ruleName == "" {
		return ruleFile.Rules(), nil
	}
	foundRule := ruleFile.GetRule(ruleName)
	if foundRule == nil {
		return nil, fmt.Errorf("rule %s not found", ruleName)
	}
	return []rulefmt.Rule{*foundRule}, nil
}