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service.go
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service.go
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package cortex
import (
"bytes"
"context"
"fmt"
texttemplate "text/template"
"time"
"github.com/grafana/cortex-tools/pkg/client"
"github.com/grafana/cortex-tools/pkg/rules/rwrulefmt"
"github.com/mitchellh/mapstructure"
"github.com/odpf/salt/log"
"github.com/odpf/siren/core/alert"
"github.com/odpf/siren/core/provider"
"github.com/odpf/siren/core/rule"
"github.com/odpf/siren/core/template"
"github.com/odpf/siren/pkg/errors"
"github.com/odpf/siren/pkg/httpclient"
"github.com/odpf/siren/plugins/receivers/base"
promconfig "github.com/prometheus/alertmanager/config"
"github.com/prometheus/prometheus/pkg/rulefmt"
"gopkg.in/yaml.v3"
)
//go:generate mockery --name=CortexCaller -r --case underscore --with-expecter --structname CortexCaller --filename cortex_caller.go --output=./mocks
type CortexCaller interface {
CreateAlertmanagerConfig(ctx context.Context, cfg string, templates map[string]string) error
CreateRuleGroup(ctx context.Context, namespace string, rg rwrulefmt.RuleGroup) error
DeleteRuleGroup(ctx context.Context, namespace, groupName string) error
GetRuleGroup(ctx context.Context, namespace, groupName string) (*rwrulefmt.RuleGroup, error)
ListRules(ctx context.Context, namespace string) (map[string][]rwrulefmt.RuleGroup, error)
}
// Service is a service layer of cortex provider plugin
type PluginService struct {
base.UnimplementedService
logger log.Logger
appConfig AppConfig
helperTemplate string
configYaml string
cortexClient CortexCaller
httpClient *httpclient.Client
}
// NewPluginService returns cortex service provider plugin struct
func NewPluginService(logger log.Logger, appConfig AppConfig, opts ...ServiceOption) *PluginService {
s := &PluginService{
logger: logger,
appConfig: appConfig,
helperTemplate: HelperTemplateString,
configYaml: ConfigYamlString,
httpClient: httpclient.New(appConfig.HTTPClient),
}
for _, opt := range opts {
opt(s)
}
return s
}
// TransformToAlerts is a function to transform alert body in hook API to []*alert.Alert
func (s *PluginService) TransformToAlerts(ctx context.Context, providerID uint64, namespaceID uint64, body map[string]interface{}) ([]alert.Alert, int, error) {
var groupAlert = &GroupAlert{}
if err := mapstructure.Decode(body, groupAlert); err != nil {
return nil, 0, err
}
var (
alerts = make([]alert.Alert, 0)
badAlertCount = 0
firingLen = 0
)
for _, item := range groupAlert.Alerts {
if err := item.Validate(); err != nil {
s.logger.Error(fmt.Sprintf("invalid alerts: %s", err.Error()), "group key", groupAlert.GroupKey, "alert detail", item)
badAlertCount++
continue
}
if item.Status == "firing" {
firingLen++
}
severity := item.Labels["severity"]
if item.Status == "resolved" {
severity = item.Status
}
startsAt, err := time.Parse(time.RFC3339Nano, item.StartsAt)
if err != nil {
badAlertCount++
break
}
alrt := alert.Alert{
ProviderID: providerID,
NamespaceID: namespaceID,
ResourceName: item.Annotations["resource"],
MetricName: item.Annotations["metric_name"],
MetricValue: item.Annotations["metric_value"],
Severity: severity,
Rule: item.Annotations["template"],
TriggeredAt: startsAt,
GroupKey: groupAlert.GroupKey,
Status: item.Status,
Annotations: item.Annotations,
Labels: item.Labels,
GeneratorURL: item.GeneratorURL,
Fingerprint: item.Fingerprint,
}
alerts = append(alerts, alrt)
}
if badAlertCount > 0 {
s.logger.Error("parameters are missing for alert", "group key", groupAlert.GroupKey, "alert count", badAlertCount)
return alerts, firingLen, nil
}
return alerts, firingLen, nil
}
// SyncRuntimeConfig synchronizes runtime configuration of provider
func (s *PluginService) SyncRuntimeConfig(ctx context.Context, namespaceID uint64, namespaceURN string, prov provider.Provider) error {
if s.appConfig.WebhookBaseAPI == "" {
return errors.New("Cortex webhook base api string in config cannot be empty")
}
webhookURL := fmt.Sprintf("%s/%d/%d", s.appConfig.WebhookBaseAPI, prov.ID, namespaceID)
tmplConfig := TemplateConfig{
GroupWaitDuration: s.appConfig.GroupWaitDuration,
GroupIntervalDuration: s.appConfig.GroupIntervalDuration,
RepeatIntervalDuration: s.appConfig.RepeatIntervalDuration,
WebhookURL: webhookURL,
}
cfg, err := s.generateAlertmanagerConfig(tmplConfig)
if err != nil {
return err
}
templates := map[string]string{
"helper.tmpl": s.helperTemplate,
}
cortexClient, err := s.getCortexClient(prov.Host, namespaceURN)
if err != nil {
return err
}
if err = cortexClient.CreateAlertmanagerConfig(ctx, cfg, templates); err != nil {
return err
}
return nil
}
// UpsertRule manages upsert logic to cortex ruler. Cortex client API granularity is on the rule-group.
// This function has a logic to work with rule-level granurality and adapt it to cortex logic.
func (s *PluginService) UpsertRule(ctx context.Context, namespaceURN string, prov provider.Provider, rl *rule.Rule, templateToUpdate *template.Template) error {
inputValues := make(map[string]string)
for _, v := range rl.Variables {
inputValues[v.Name] = v.Value
}
renderedRule, err := template.RenderWithEnrichedDefault(templateToUpdate.Body, templateToUpdate.Variables, inputValues)
if err != nil {
return err
}
cortexClient, err := s.getCortexClient(prov.Host, namespaceURN)
if err != nil {
return err
}
var upsertedRuleNodes []rulefmt.RuleNode
if err := yaml.Unmarshal([]byte(renderedRule), &upsertedRuleNodes); err != nil {
return errors.ErrInvalid.WithMsgf("cannot parse upserted rule").WithCausef(err.Error())
}
cortexRuleGroup, err := cortexClient.GetRuleGroup(ctx, rl.Namespace, rl.GroupName)
if err != nil {
if errors.Is(err, client.ErrResourceNotFound) {
cortexRuleGroup = &rwrulefmt.RuleGroup{}
} else {
return errors.ErrInvalid.WithMsgf("cannot get rule group from cortex when upserting rules").WithCausef(err.Error())
}
}
newRuleNodes, err := mergeRuleNodes(cortexRuleGroup.Rules, upsertedRuleNodes, rl.Enabled)
if err != nil {
return err
}
if len(newRuleNodes) == 0 {
if err := cortexClient.DeleteRuleGroup(ctx, rl.Namespace, rl.GroupName); err != nil {
if err.Error() == "requested resource not found" {
return nil
}
return fmt.Errorf("error calling cortex: %w", err)
}
return nil
}
cortexRuleGroup = &rwrulefmt.RuleGroup{
RuleGroup: rulefmt.RuleGroup{
Name: rl.GroupName,
Rules: newRuleNodes,
},
}
if err := cortexClient.CreateRuleGroup(ctx, rl.Namespace, *cortexRuleGroup); err != nil {
return fmt.Errorf("error calling cortex: %w", err)
}
return nil
}
func mergeRuleNodes(ruleNodes []rulefmt.RuleNode, newRuleNodes []rulefmt.RuleNode, enabled bool) ([]rulefmt.RuleNode, error) {
for _, nrn := range newRuleNodes {
var action string = "insert"
var idxCount = 0
for _, ruleNode := range ruleNodes {
if ruleNode.Alert.Value == nrn.Alert.Value {
if !enabled {
action = "delete"
break
}
action = "update"
break
}
idxCount++
}
switch action {
case "delete":
if idxCount >= len(ruleNodes) || idxCount < 0 {
return nil, errors.New("something wrong when comparing rule node")
}
ruleNodes = append(ruleNodes[:idxCount], ruleNodes[idxCount+1:]...)
case "update":
ruleNodes[idxCount] = nrn
default:
if !enabled {
return ruleNodes, nil
}
ruleNodes = append(ruleNodes, nrn)
}
}
return ruleNodes, nil
}
func (s *PluginService) generateAlertmanagerConfig(tmplConfig TemplateConfig) (string, error) {
delims := texttemplate.New("alertmanagerConfigTemplate").Delims("[[", "]]")
parse, err := delims.Parse(s.configYaml)
if err != nil {
return "", err
}
var tpl bytes.Buffer
err = parse.Execute(&tpl, tmplConfig)
if err != nil {
// it is unlikely that the code returns error here
return "", err
}
configStr := tpl.String()
_, err = promconfig.Load(configStr)
if err != nil {
return "", err
}
return configStr, nil
}
func (s *PluginService) getCortexClient(address string, tenant string) (CortexCaller, error) {
if s.cortexClient != nil {
return s.cortexClient, nil
}
cortexClient, err := client.New(client.Config{
Address: address,
ID: tenant,
})
if err != nil {
return nil, err
}
cortexClient.Client = *s.httpClient.HTTP()
return cortexClient, nil
}