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metrics.go
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metrics.go
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/*
http://www.apache.org/licenses/LICENSE-2.0.txt
Copyright 2015 Intel Corporation
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package control
import (
"errors"
"fmt"
"strings"
"sync"
"time"
"github.com/intelsdi-x/pulse/control/plugin/cpolicy"
"github.com/intelsdi-x/pulse/core"
"github.com/intelsdi-x/pulse/core/cdata"
"github.com/intelsdi-x/pulse/core/ctypes"
"github.com/intelsdi-x/pulse/core/perror"
)
var (
errMetricNotFound = errors.New("metric not found")
errNegativeSubCount = perror.New(errors.New("subscription count cannot be < 0"))
)
func errorMetricNotFound(ns []string, ver ...int) error {
if len(ver) > 0 {
return fmt.Errorf("Metric not found: %s (version: %d)", core.JoinNamespace(ns), ver[0])
}
return fmt.Errorf("Metric not found: %s", core.JoinNamespace(ns))
}
type metricCatalogItem struct {
namespace string
versions map[int]core.Metric
}
func (m *metricCatalogItem) Namespace() string {
return m.namespace
}
func (m *metricCatalogItem) Versions() map[int]core.Metric {
return m.versions
}
type metricType struct {
Plugin *loadedPlugin
namespace []string
version int
lastAdvertisedTime time.Time
subscriptions int
policy processesConfigData
config *cdata.ConfigDataNode
data interface{}
source string
timestamp time.Time
}
type processesConfigData interface {
Process(map[string]ctypes.ConfigValue) (*map[string]ctypes.ConfigValue, *cpolicy.ProcessingErrors)
HasRules() bool
}
func newMetricType(ns []string, last time.Time, plugin *loadedPlugin) *metricType {
return &metricType{
Plugin: plugin,
namespace: ns,
lastAdvertisedTime: last,
}
}
func (m *metricType) Key() string {
return fmt.Sprintf("%s/%d", m.NamespaceAsString(), m.Version())
}
func (m *metricType) Namespace() []string {
return m.namespace
}
func (m *metricType) NamespaceAsString() string {
return core.JoinNamespace(m.Namespace())
}
func (m *metricType) Data() interface{} {
return m.data
}
func (m *metricType) LastAdvertisedTime() time.Time {
return m.lastAdvertisedTime
}
func (m *metricType) Subscribe() {
m.subscriptions++
}
func (m *metricType) Unsubscribe() perror.PulseError {
if m.subscriptions == 0 {
return errNegativeSubCount
}
m.subscriptions--
return nil
}
func (m *metricType) SubscriptionCount() int {
return m.subscriptions
}
func (m *metricType) Version() int {
if m.version > 0 {
return m.version
}
if m.Plugin == nil {
return -1
}
return m.Plugin.Version()
}
func (m *metricType) Config() *cdata.ConfigDataNode {
return m.config
}
func (m *metricType) Policy() *cpolicy.ConfigPolicyNode {
return m.policy.(*cpolicy.ConfigPolicyNode)
}
func (m *metricType) Source() string {
return m.source
}
func (m *metricType) Timestamp() time.Time {
return m.timestamp
}
type metricCatalog struct {
tree *MTTrie
mutex *sync.Mutex
keys []string
currentIter int
}
func newMetricCatalog() *metricCatalog {
var k []string
return &metricCatalog{
tree: NewMTTrie(),
mutex: &sync.Mutex{},
currentIter: 0,
keys: k,
}
}
func (mc *metricCatalog) AddLoadedMetricType(lp *loadedPlugin, mt core.Metric) {
if lp.ConfigPolicy == nil {
panic("NO")
}
newMt := metricType{
Plugin: lp,
namespace: mt.Namespace(),
version: mt.Version(),
lastAdvertisedTime: mt.LastAdvertisedTime(),
policy: lp.ConfigPolicy.Get(mt.Namespace()),
}
mc.Add(&newMt)
}
func (mc *metricCatalog) RmUnloadedPluginMetrics(lp *loadedPlugin) {
mc.mutex.Lock()
defer mc.mutex.Unlock()
mc.tree.DeleteByPlugin(lp)
}
// Add adds a metricType
func (mc *metricCatalog) Add(m *metricType) {
mc.mutex.Lock()
defer mc.mutex.Unlock()
key := getMetricKey(m.Namespace())
mc.keys = appendIfMissing(mc.keys, key)
mc.tree.Add(m)
}
// Get retrieves a loadedPlugin given a namespace and version.
// If provided a version of -1 the latest plugin will be returned.
func (mc *metricCatalog) Get(ns []string, version int) (*metricType, perror.PulseError) {
mc.mutex.Lock()
defer mc.mutex.Unlock()
return mc.get(ns, version)
}
// Fetch transactionally retrieves all metrics which fall under namespace ns
func (mc *metricCatalog) Fetch(ns []string) ([]*metricType, perror.PulseError) {
mc.mutex.Lock()
defer mc.mutex.Unlock()
mtsi, err := mc.tree.Fetch(ns)
if err != nil {
return nil, err
}
return mtsi, nil
}
func (mc *metricCatalog) Remove(ns []string) {
mc.mutex.Lock()
mc.tree.Remove(ns)
mc.mutex.Unlock()
}
// Item returns the current metricType in the collection. The method Next()
// provides the means to move the iterator forward.
func (mc *metricCatalog) Item() (string, []*metricType) {
key := mc.keys[mc.currentIter-1]
ns := strings.Split(key, ".")
mtsi, _ := mc.tree.Get(ns)
var mts []*metricType
for _, mt := range mtsi {
mts = append(mts, mt)
}
return key, mts
}
// Next returns true until the "end" of the collection is reached. When
// the end of the collection is reached the iterator is reset back to the
// head of the collection.
func (mc *metricCatalog) Next() bool {
mc.currentIter++
if mc.currentIter > len(mc.keys) {
mc.currentIter = 0
return false
}
return true
}
// Subscribe atomically increments a metric's subscription count in the table.
func (mc *metricCatalog) Subscribe(ns []string, version int) perror.PulseError {
mc.mutex.Lock()
defer mc.mutex.Unlock()
m, err := mc.get(ns, version)
if err != nil {
return err
}
m.Subscribe()
return nil
}
// Unsubscribe atomically decrements a metric's count in the table
func (mc *metricCatalog) Unsubscribe(ns []string, version int) perror.PulseError {
mc.mutex.Lock()
defer mc.mutex.Unlock()
m, err := mc.get(ns, version)
if err != nil {
return err
}
return m.Unsubscribe()
}
func (mc *metricCatalog) GetPlugin(mns []string, ver int) (*loadedPlugin, perror.PulseError) {
m, err := mc.Get(mns, ver)
if err != nil {
return nil, err
}
return m.Plugin, nil
}
func (mc *metricCatalog) get(ns []string, ver int) (*metricType, perror.PulseError) {
mts, err := mc.tree.Get(ns)
if err != nil {
return nil, err
}
if mts == nil {
return nil, perror.New(errMetricNotFound)
}
// a version IS given
if ver > 0 {
l, err := getVersion(mts, ver)
if err != nil {
pe := perror.New(errorMetricNotFound(ns, ver))
pe.SetFields(map[string]interface{}{
"name": core.JoinNamespace(ns),
"version": ver,
})
return nil, pe
}
return l, nil
}
// ver is less than or equal to 0 get the latest
return getLatest(mts), nil
}
func getMetricKey(metric []string) string {
return strings.Join(metric, ".")
}
func getLatest(c []*metricType) *metricType {
cur := c[0]
for _, mt := range c {
if mt.Version() > cur.Version() {
cur = mt
}
}
return cur
}
func appendIfMissing(keys []string, ns string) []string {
for _, key := range keys {
if ns == key {
return keys
}
}
return append(keys, ns)
}
func getVersion(c []*metricType, ver int) (*metricType, perror.PulseError) {
for _, m := range c {
if m.Plugin.Version() == ver {
return m, nil
}
}
return nil, perror.New(errMetricNotFound)
}