func findAvailableRules()

in tool/preprocess/match.go [105:146]
32 lines of code
8 McCabe index (conditional complexity)

func findAvailableRules() []resource.InstRule {
	util.GuaranteeInPreprocess()
	// Disable all instrumentation rules and rebuild the whole project to restore
	// all instrumentation actions, this also reverts the modification on Golang
	// runtime package.
	if config.GetConf().Restore {
		return nil
	}

	rules := make([]resource.InstRule, 0)

	// Load default rules unless explicitly disabled
	if !config.GetConf().IsDisableDefault() {
		defaultRules := loadDefaultRules()
		rules = append(rules, defaultRules...)
	}

	// If rule files are provided, load them
	if config.GetConf().RuleJsonFiles != "" {
		// Load multiple rule files
		if strings.Contains(config.GetConf().RuleJsonFiles, ",") {
			ruleFiles := strings.Split(config.GetConf().RuleJsonFiles, ",")
			for _, ruleFile := range ruleFiles {
				r, err := loadRuleFile(ruleFile)
				if err != nil {
					util.Log("Failed to load rules: %v", err)
					continue
				}
				rules = append(rules, r...)
			}
			return rules
		}
		// Load the one rule file
		rs, err := loadRuleFile(config.GetConf().RuleJsonFiles)
		if err != nil {
			util.Log("Failed to load rules: %v", err)
			return nil
		}
		rules = append(rules, rs...)
	}
	return rules
}