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dispatch.go
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dispatch.go
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package dispatch
import (
"bytes"
"encoding/json"
"html/template"
"strconv"
"sync"
"time"
"github.com/ccfos/nightingale/v6/alert/aconf"
"github.com/ccfos/nightingale/v6/alert/astats"
"github.com/ccfos/nightingale/v6/alert/common"
"github.com/ccfos/nightingale/v6/alert/sender"
"github.com/ccfos/nightingale/v6/memsto"
"github.com/ccfos/nightingale/v6/models"
"github.com/ccfos/nightingale/v6/pkg/ctx"
"github.com/toolkits/pkg/logger"
)
type Dispatch struct {
alertRuleCache *memsto.AlertRuleCacheType
userCache *memsto.UserCacheType
userGroupCache *memsto.UserGroupCacheType
alertSubscribeCache *memsto.AlertSubscribeCacheType
targetCache *memsto.TargetCacheType
notifyConfigCache *memsto.NotifyConfigCacheType
alerting aconf.Alerting
Senders map[string]sender.Sender
tpls map[string]*template.Template
ExtraSenders map[string]sender.Sender
BeforeSenderHook func(*models.AlertCurEvent) bool
ctx *ctx.Context
Astats *astats.Stats
RwLock sync.RWMutex
}
// 创建一个 Notify 实例
func NewDispatch(alertRuleCache *memsto.AlertRuleCacheType, userCache *memsto.UserCacheType, userGroupCache *memsto.UserGroupCacheType,
alertSubscribeCache *memsto.AlertSubscribeCacheType, targetCache *memsto.TargetCacheType, notifyConfigCache *memsto.NotifyConfigCacheType,
alerting aconf.Alerting, ctx *ctx.Context, astats *astats.Stats) *Dispatch {
notify := &Dispatch{
alertRuleCache: alertRuleCache,
userCache: userCache,
userGroupCache: userGroupCache,
alertSubscribeCache: alertSubscribeCache,
targetCache: targetCache,
notifyConfigCache: notifyConfigCache,
alerting: alerting,
Senders: make(map[string]sender.Sender),
tpls: make(map[string]*template.Template),
ExtraSenders: make(map[string]sender.Sender),
BeforeSenderHook: func(*models.AlertCurEvent) bool { return true },
ctx: ctx,
Astats: astats,
}
return notify
}
func (e *Dispatch) ReloadTpls() error {
err := e.relaodTpls()
if err != nil {
logger.Errorf("failed to reload tpls: %v", err)
}
duration := time.Duration(9000) * time.Millisecond
for {
time.Sleep(duration)
if err := e.relaodTpls(); err != nil {
logger.Warning("failed to reload tpls:", err)
}
}
}
func (e *Dispatch) relaodTpls() error {
tmpTpls, err := models.ListTpls(e.ctx)
if err != nil {
return err
}
smtp := e.notifyConfigCache.GetSMTP()
senders := map[string]sender.Sender{
models.Email: sender.NewSender(models.Email, tmpTpls, smtp),
models.Dingtalk: sender.NewSender(models.Dingtalk, tmpTpls),
models.Wecom: sender.NewSender(models.Wecom, tmpTpls),
models.Feishu: sender.NewSender(models.Feishu, tmpTpls),
models.Mm: sender.NewSender(models.Mm, tmpTpls),
models.Telegram: sender.NewSender(models.Telegram, tmpTpls),
models.FeishuCard: sender.NewSender(models.FeishuCard, tmpTpls),
}
e.RwLock.RLock()
for channelName, extraSender := range e.ExtraSenders {
senders[channelName] = extraSender
}
e.RwLock.RUnlock()
e.RwLock.Lock()
e.tpls = tmpTpls
e.Senders = senders
e.RwLock.Unlock()
return nil
}
// HandleEventNotify 处理event事件的主逻辑
// event: 告警/恢复事件
// isSubscribe: 告警事件是否由subscribe的配置产生
func (e *Dispatch) HandleEventNotify(event *models.AlertCurEvent, isSubscribe bool) {
rule := e.alertRuleCache.Get(event.RuleId)
if rule == nil {
return
}
fillUsers(event, e.userCache, e.userGroupCache)
var (
// 处理事件到 notifyTarget 关系,处理的notifyTarget用OrMerge进行合并
handlers []NotifyTargetDispatch
// 额外去掉一些订阅,处理的notifyTarget用AndMerge进行合并, 如设置 channel=false,合并后不通过这个channel发送
// 如果实现了相关 Dispatch,可以添加到interceptors中
interceptorHandlers []NotifyTargetDispatch
)
if isSubscribe {
handlers = []NotifyTargetDispatch{NotifyGroupDispatch, EventCallbacksDispatch}
} else {
handlers = []NotifyTargetDispatch{NotifyGroupDispatch, GlobalWebhookDispatch, EventCallbacksDispatch}
}
notifyTarget := NewNotifyTarget()
// 处理订阅关系使用OrMerge
for _, handler := range handlers {
notifyTarget.OrMerge(handler(rule, event, notifyTarget, e))
}
// 处理移除订阅关系的逻辑,比如员工离职,临时静默某个通道的策略等
for _, handler := range interceptorHandlers {
notifyTarget.AndMerge(handler(rule, event, notifyTarget, e))
}
// 处理事件发送,这里用一个goroutine处理一个event的所有发送事件
go e.Send(rule, event, notifyTarget)
// 如果是不是订阅规则出现的event, 则需要处理订阅规则的event
if !isSubscribe {
e.handleSubs(event)
}
}
func (e *Dispatch) handleSubs(event *models.AlertCurEvent) {
// handle alert subscribes
subscribes := make([]*models.AlertSubscribe, 0)
// rule specific subscribes
if subs, has := e.alertSubscribeCache.Get(event.RuleId); has {
subscribes = append(subscribes, subs...)
}
// global subscribes
if subs, has := e.alertSubscribeCache.Get(0); has {
subscribes = append(subscribes, subs...)
}
for _, sub := range subscribes {
e.handleSub(sub, *event)
}
}
// handleSub 处理订阅规则的event,注意这里event要使用值传递,因为后面会修改event的状态
func (e *Dispatch) handleSub(sub *models.AlertSubscribe, event models.AlertCurEvent) {
if sub.IsDisabled() {
return
}
if !sub.MatchCluster(event.DatasourceId) {
return
}
if !sub.MatchProd(event.RuleProd) {
return
}
if !common.MatchTags(event.TagsMap, sub.ITags) {
return
}
// event BusiGroups filter
if !common.MatchGroupsName(event.GroupName, sub.IBusiGroups) {
return
}
if sub.ForDuration > (event.TriggerTime - event.FirstTriggerTime) {
return
}
if len(sub.SeveritiesJson) != 0 {
match := false
for _, s := range sub.SeveritiesJson {
if s == event.Severity || s == 0 {
match = true
break
}
}
if !match {
return
}
}
e.Astats.CounterSubEventTotal.WithLabelValues(event.GroupName).Inc()
sub.ModifyEvent(&event)
event.SubRuleId = sub.Id
LogEvent(&event, "subscribe")
e.HandleEventNotify(&event, true)
}
func (e *Dispatch) Send(rule *models.AlertRule, event *models.AlertCurEvent, notifyTarget *NotifyTarget) {
needSend := e.BeforeSenderHook(event)
if needSend {
for channel, uids := range notifyTarget.ToChannelUserMap() {
msgCtx := sender.BuildMessageContext(rule, []*models.AlertCurEvent{event}, uids, e.userCache, e.Astats)
e.RwLock.RLock()
s := e.Senders[channel]
e.RwLock.RUnlock()
if s == nil {
logger.Debugf("no sender for channel: %s", channel)
continue
}
s.Send(msgCtx)
}
}
// handle event callbacks
sender.SendCallbacks(e.ctx, notifyTarget.ToCallbackList(), event, e.targetCache, e.userCache, e.notifyConfigCache.GetIbex(), e.Astats)
// handle global webhooks
sender.SendWebhooks(notifyTarget.ToWebhookList(), event, e.Astats)
// handle plugin call
go sender.MayPluginNotify(e.genNoticeBytes(event), e.notifyConfigCache.GetNotifyScript(), e.Astats)
}
type Notice struct {
Event *models.AlertCurEvent `json:"event"`
Tpls map[string]string `json:"tpls"`
}
func (e *Dispatch) genNoticeBytes(event *models.AlertCurEvent) []byte {
// build notice body with templates
ntpls := make(map[string]string)
e.RwLock.RLock()
defer e.RwLock.RUnlock()
for filename, tpl := range e.tpls {
var body bytes.Buffer
if err := tpl.Execute(&body, event); err != nil {
ntpls[filename] = err.Error()
} else {
ntpls[filename] = body.String()
}
}
notice := Notice{Event: event, Tpls: ntpls}
stdinBytes, err := json.Marshal(notice)
if err != nil {
logger.Errorf("event_notify: failed to marshal notice: %v", err)
return nil
}
return stdinBytes
}
// for alerting
func fillUsers(ce *models.AlertCurEvent, uc *memsto.UserCacheType, ugc *memsto.UserGroupCacheType) {
gids := make([]int64, 0, len(ce.NotifyGroupsJSON))
for i := 0; i < len(ce.NotifyGroupsJSON); i++ {
gid, err := strconv.ParseInt(ce.NotifyGroupsJSON[i], 10, 64)
if err != nil {
continue
}
gids = append(gids, gid)
}
ce.NotifyGroupsObj = ugc.GetByUserGroupIds(gids)
uids := make(map[int64]struct{})
for i := 0; i < len(ce.NotifyGroupsObj); i++ {
ug := ce.NotifyGroupsObj[i]
for j := 0; j < len(ug.UserIds); j++ {
uids[ug.UserIds[j]] = struct{}{}
}
}
ce.NotifyUsersObj = uc.GetByUserIds(mapKeys(uids))
}
func mapKeys(m map[int64]struct{}) []int64 {
lst := make([]int64, 0, len(m))
for k := range m {
lst = append(lst, k)
}
return lst
}