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alertmanager.go
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alertmanager.go
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package notifier
import (
"bytes"
"context"
"fmt"
"io"
"net/http"
"net/url"
"strings"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/app/vmalert/utils"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
)
// AlertManager represents integration provider with Prometheus alert manager
// https://github.com/prometheus/alertmanager
type AlertManager struct {
addr *url.URL
argFunc AlertURLGenerator
client *http.Client
timeout time.Duration
authCfg *promauth.Config
// stores already parsed RelabelConfigs object
relabelConfigs *promrelabel.ParsedConfigs
metrics *metrics
}
type metrics struct {
alertsSent *utils.Counter
alertsSendErrors *utils.Counter
}
func newMetrics(addr string) *metrics {
return &metrics{
alertsSent: utils.GetOrCreateCounter(fmt.Sprintf("vmalert_alerts_sent_total{addr=%q}", addr)),
alertsSendErrors: utils.GetOrCreateCounter(fmt.Sprintf("vmalert_alerts_send_errors_total{addr=%q}", addr)),
}
}
// Close is a destructor method for AlertManager
func (am *AlertManager) Close() {
am.metrics.alertsSent.Unregister()
am.metrics.alertsSendErrors.Unregister()
}
// Addr returns address where alerts are sent.
func (am AlertManager) Addr() string {
if *showNotifierURL {
return am.addr.String()
}
return am.addr.Redacted()
}
// Send an alert or resolve message
func (am *AlertManager) Send(ctx context.Context, alerts []Alert, headers map[string]string) error {
am.metrics.alertsSent.Add(len(alerts))
err := am.send(ctx, alerts, headers)
if err != nil {
am.metrics.alertsSendErrors.Add(len(alerts))
}
return err
}
func (am *AlertManager) send(ctx context.Context, alerts []Alert, headers map[string]string) error {
b := &bytes.Buffer{}
writeamRequest(b, alerts, am.argFunc, am.relabelConfigs)
req, err := http.NewRequest(http.MethodPost, am.addr.String(), b)
if err != nil {
return err
}
req.Header.Set("Content-Type", "application/json")
for key, value := range headers {
req.Header.Set(key, value)
}
if am.timeout > 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, am.timeout)
defer cancel()
}
req = req.WithContext(ctx)
if am.authCfg != nil {
err = am.authCfg.SetHeaders(req, true)
if err != nil {
return err
}
}
resp, err := am.client.Do(req)
if err != nil {
return err
}
defer func() { _ = resp.Body.Close() }()
amURL := am.addr.Redacted()
if *showNotifierURL {
amURL = am.addr.String()
}
if resp.StatusCode != http.StatusOK {
body, err := io.ReadAll(resp.Body)
if err != nil {
return fmt.Errorf("failed to read response from %q: %w", amURL, err)
}
return fmt.Errorf("invalid SC %d from %q; response body: %s", resp.StatusCode, amURL, string(body))
}
return nil
}
// AlertURLGenerator returns URL to single alert by given name
type AlertURLGenerator func(Alert) string
const alertManagerPath = "/api/v2/alerts"
// NewAlertManager is a constructor for AlertManager
func NewAlertManager(alertManagerURL string, fn AlertURLGenerator, authCfg promauth.HTTPClientConfig,
relabelCfg *promrelabel.ParsedConfigs, timeout time.Duration,
) (*AlertManager, error) {
tls := &promauth.TLSConfig{}
if authCfg.TLSConfig != nil {
tls = authCfg.TLSConfig
}
tr, err := utils.Transport(alertManagerURL, tls.CertFile, tls.KeyFile, tls.CAFile, tls.ServerName, tls.InsecureSkipVerify)
if err != nil {
return nil, fmt.Errorf("failed to create transport: %w", err)
}
ba := new(promauth.BasicAuthConfig)
oauth := new(promauth.OAuth2Config)
if authCfg.BasicAuth != nil {
ba = authCfg.BasicAuth
}
if authCfg.OAuth2 != nil {
oauth = authCfg.OAuth2
}
aCfg, err := utils.AuthConfig(
utils.WithBasicAuth(ba.Username, ba.Password.String(), ba.PasswordFile),
utils.WithBearer(authCfg.BearerToken.String(), authCfg.BearerTokenFile),
utils.WithOAuth(oauth.ClientID, oauth.ClientSecretFile, oauth.ClientSecretFile, oauth.TokenURL, strings.Join(oauth.Scopes, ";")))
if err != nil {
return nil, fmt.Errorf("failed to configure auth: %w", err)
}
amURL, err := url.Parse(alertManagerURL)
if err != nil {
return nil, fmt.Errorf("provided incorrect notifier url: %w", err)
}
if !*showNotifierURL {
alertManagerURL = amURL.Redacted()
}
return &AlertManager{
addr: amURL,
argFunc: fn,
authCfg: aCfg,
relabelConfigs: relabelCfg,
client: &http.Client{Transport: tr},
timeout: timeout,
metrics: newMetrics(alertManagerURL),
}, nil
}