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manager.go
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manager.go
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package main
import (
"context"
"fmt"
"net/url"
"sort"
"sync"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmalert/config"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmalert/datasource"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmalert/notifier"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmalert/remotewrite"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
)
// manager controls group states
type manager struct {
querierBuilder datasource.QuerierBuilder
notifiers func() []notifier.Notifier
rw *remotewrite.Client
// remote read builder.
rr datasource.QuerierBuilder
wg sync.WaitGroup
labels map[string]string
groupsMu sync.RWMutex
groups map[uint64]*Group
}
// RuleAPI generates APIRule object from alert by its ID(hash)
func (m *manager) RuleAPI(gID, rID uint64) (APIRule, error) {
m.groupsMu.RLock()
defer m.groupsMu.RUnlock()
g, ok := m.groups[gID]
if !ok {
return APIRule{}, fmt.Errorf("can't find group with id %d", gID)
}
for _, rule := range g.Rules {
if rule.ID() == rID {
return rule.ToAPI(), nil
}
}
return APIRule{}, fmt.Errorf("can't find rule with id %d in group %q", rID, g.Name)
}
// AlertAPI generates APIAlert object from alert by its ID(hash)
func (m *manager) AlertAPI(gID, aID uint64) (*APIAlert, error) {
m.groupsMu.RLock()
defer m.groupsMu.RUnlock()
g, ok := m.groups[gID]
if !ok {
return nil, fmt.Errorf("can't find group with id %d", gID)
}
for _, rule := range g.Rules {
ar, ok := rule.(*AlertingRule)
if !ok {
continue
}
if apiAlert := ar.AlertAPI(aID); apiAlert != nil {
return apiAlert, nil
}
}
return nil, fmt.Errorf("can't find alert with id %d in group %q", aID, g.Name)
}
func (m *manager) start(ctx context.Context, groupsCfg []config.Group) error {
return m.update(ctx, groupsCfg, true)
}
func (m *manager) close() {
if m.rw != nil {
err := m.rw.Close()
if err != nil {
logger.Fatalf("cannot stop the remotewrite: %s", err)
}
}
m.wg.Wait()
}
func (m *manager) startGroup(ctx context.Context, g *Group, restore bool) error {
m.wg.Add(1)
id := g.ID()
go func() {
// Spread group rules evaluation over time in order to reduce load on VictoriaMetrics.
if !skipRandSleepOnGroupStart {
randSleep := uint64(float64(g.Interval) * (float64(g.ID()) / (1 << 64)))
sleepOffset := uint64(time.Now().UnixNano()) % uint64(g.Interval)
if randSleep < sleepOffset {
randSleep += uint64(g.Interval)
}
randSleep -= sleepOffset
sleepTimer := time.NewTimer(time.Duration(randSleep))
select {
case <-ctx.Done():
sleepTimer.Stop()
return
case <-g.doneCh:
sleepTimer.Stop()
return
case <-sleepTimer.C:
}
}
if restore {
g.start(ctx, m.notifiers, m.rw, m.rr)
} else {
g.start(ctx, m.notifiers, m.rw, nil)
}
m.wg.Done()
}()
m.groups[id] = g
return nil
}
func (m *manager) update(ctx context.Context, groupsCfg []config.Group, restore bool) error {
var rrPresent, arPresent bool
groupsRegistry := make(map[uint64]*Group)
for _, cfg := range groupsCfg {
for _, r := range cfg.Rules {
if rrPresent && arPresent {
continue
}
if r.Record != "" {
rrPresent = true
}
if r.Alert != "" {
arPresent = true
}
}
ng := newGroup(cfg, m.querierBuilder, *evaluationInterval, m.labels)
groupsRegistry[ng.ID()] = ng
}
if rrPresent && m.rw == nil {
return fmt.Errorf("config contains recording rules but `-remoteWrite.url` isn't set")
}
if arPresent && m.notifiers == nil {
return fmt.Errorf("config contains alerting rules but neither `-notifier.url` nor `-notifier.config` aren't set")
}
type updateItem struct {
old *Group
new *Group
}
var toUpdate []updateItem
m.groupsMu.Lock()
for _, og := range m.groups {
ng, ok := groupsRegistry[og.ID()]
if !ok {
// old group is not present in new list,
// so must be stopped and deleted
og.close()
delete(m.groups, og.ID())
og = nil
continue
}
delete(groupsRegistry, ng.ID())
if og.Checksum != ng.Checksum {
toUpdate = append(toUpdate, updateItem{old: og, new: ng})
}
}
for _, ng := range groupsRegistry {
if err := m.startGroup(ctx, ng, restore); err != nil {
return err
}
}
m.groupsMu.Unlock()
if len(toUpdate) > 0 {
var wg sync.WaitGroup
for _, item := range toUpdate {
wg.Add(1)
go func(old *Group, new *Group) {
old.updateCh <- new
wg.Done()
}(item.old, item.new)
}
wg.Wait()
}
return nil
}
func (g *Group) toAPI() APIGroup {
g.mu.RLock()
defer g.mu.RUnlock()
ag := APIGroup{
// encode as string to avoid rounding
ID: fmt.Sprintf("%d", g.ID()),
Name: g.Name,
Type: g.Type.String(),
File: g.File,
Interval: g.Interval.Seconds(),
LastEvaluation: g.LastEvaluation,
Concurrency: g.Concurrency,
Params: urlValuesToStrings(g.Params),
Headers: headersToStrings(g.Headers),
Labels: g.Labels,
}
for _, r := range g.Rules {
ag.Rules = append(ag.Rules, r.ToAPI())
}
return ag
}
func urlValuesToStrings(values url.Values) []string {
if len(values) < 1 {
return nil
}
keys := make([]string, 0, len(values))
for k := range values {
keys = append(keys, k)
}
sort.Strings(keys)
var res []string
for _, k := range keys {
params := values[k]
for _, v := range params {
res = append(res, fmt.Sprintf("%s=%s", k, v))
}
}
return res
}
func headersToStrings(headers map[string]string) []string {
if len(headers) < 1 {
return nil
}
keys := make([]string, 0, len(headers))
for k := range headers {
keys = append(keys, k)
}
sort.Strings(keys)
var res []string
for _, k := range keys {
v := headers[k]
res = append(res, fmt.Sprintf("%s: %s", k, v))
}
return res
}