Golang Namespace.String方法代码示例

func memStat(ns core.Namespace, swagURL string) (*plugin.MetricType, error) {
	memType := ns.Strings()[3]
	switch {
	case regexp.MustCompile(`^/` + Vendor + `/` + Name + `/memory/free`).MatchString(ns.String()):
		metric, err := getMemStat(swagURL, memType)
		if err != nil {
			return nil, err
		}
		return &plugin.MetricType{
			Namespace_: ns,
			Data_:      metric,
			Timestamp_: time.Now(),
		}, nil

	case regexp.MustCompile(`^/` + Vendor + `/` + Name + `/memory/total`).MatchString(ns.String()):
		metric, err := getMemStat(swagURL, memType)
		if err != nil {
			return nil, err
		}
		return &plugin.MetricType{
			Namespace_: ns,
			Data_:      metric,
			Timestamp_: time.Now(),
		}, nil

	}

	return nil, fmt.Errorf("Unknown error processing %v", ns)
}

// validateMetricNamespace validates metric namespace in terms of containing not allowed characters and ending with an asterisk
func validateMetricNamespace(ns core.Namespace) error {
	value := ""
	for _, i := range ns {
		// A dynamic element requires the name while a static element does not.
		if i.Name != "" && i.Value != "*" {
			return errorMetricStaticElementHasName(i.Value, i.Name, ns.String())
		}
		if i.Name == "" && i.Value == "*" {
			return errorMetricDynamicElementHasNoName(i.Value, ns.String())
		}

		value += i.Value
	}

	for _, chars := range notAllowedChars {
		for _, ch := range chars {
			if strings.ContainsAny(value, ch) {
				return errorMetricContainsNotAllowedChars(ns.String())
			}
		}
	}
	// plugin should NOT advertise metrics ending with a wildcard
	if strings.HasSuffix(value, "*") {
		return errorMetricEndsWithAsterisk(ns.String())
	}

	return nil
}

// validateMetricNamespace validates metric namespace in terms of containing not allowed characters and ending with an asterisk
func validateMetricNamespace(ns core.Namespace) error {
	name := ""
	for _, i := range ns {
		name += i.Value
	}
	for _, chars := range notAllowedChars {
		for _, ch := range chars {
			if strings.ContainsAny(name, ch) {
				return errorMetricContainsNotAllowedChars(ns.String())
			}
		}
	}
	// plugin should NOT advertise metrics ending with a wildcard
	if strings.HasSuffix(name, "*") {
		return errorMetricEndsWithAsterisk(ns.String())
	}

	return nil
}

// GetMetric retrieves a metric for a given requested namespace and version.
// If provided a version of -1 the latest plugin will be returned.
func (mc *metricCatalog) GetMetric(requested core.Namespace, version int) (*metricType, error) {
	mc.mutex.Lock()
	defer mc.mutex.Unlock()

	var ns core.Namespace

	catalogedmt, err := mc.tree.GetMetric(requested.Strings(), version)
	if err != nil {
		log.WithFields(log.Fields{
			"_module": "control",
			"_file":   "metrics.go,",
			"_block":  "get-metric",
			"error":   err,
		}).Error("error getting metric")
		return nil, err
	}

	ns = catalogedmt.Namespace()

	if isDynamic, _ := ns.IsDynamic(); isDynamic {
		// when namespace is dynamic and the cataloged namespace (e.g. ns=/intel/mock/*/bar) is different than
		// the requested (e.g. requested=/intel/mock/host0/bar), than specify an instance of dynamic element,
		// so as a result the dynamic element will have set a value (e.g. ns[2].Value equals "host0")
		if ns.String() != requested.String() {
			ns = specifyInstanceOfDynamicMetric(ns, requested)
		}
	}

	returnedmt := &metricType{
		Plugin:             catalogedmt.Plugin,
		namespace:          ns,
		version:            catalogedmt.Version(),
		lastAdvertisedTime: catalogedmt.LastAdvertisedTime(),
		tags:               catalogedmt.Tags(),
		policy:             catalogedmt.Plugin.ConfigPolicy.Get(catalogedmt.Namespace().Strings()),
		config:             catalogedmt.Config(),
		unit:               catalogedmt.Unit(),
		description:        catalogedmt.Description(),
		subscriptions:      catalogedmt.SubscriptionCount(),
	}
	return returnedmt, nil
}