70 lines
2.0 KiB
Go
70 lines
2.0 KiB
Go
package alerts
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import (
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"fmt"
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"log"
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"github.com/jasper/quptime/internal/checks"
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"github.com/jasper/quptime/internal/config"
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)
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// Dispatcher fans an aggregator transition out to every alert listed
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// on the check. Errors are logged but never propagated: alerting must
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// not block the aggregation pipeline.
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type Dispatcher struct {
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cluster *config.ClusterConfig
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selfID string
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logger *log.Logger
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}
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// New constructs a Dispatcher.
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func New(cluster *config.ClusterConfig, selfID string, logger *log.Logger) *Dispatcher {
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if logger == nil {
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logger = log.Default()
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}
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return &Dispatcher{cluster: cluster, selfID: selfID, logger: logger}
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}
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// OnTransition is wired as checks.TransitionFn.
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func (d *Dispatcher) OnTransition(check *config.Check, from, to checks.State, snap checks.Snapshot) {
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if to == checks.StateUnknown {
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return
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}
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msg := Render(d.selfID, check, from, to, snap)
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for _, alertID := range check.AlertIDs {
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alert := d.cluster.FindAlert(alertID)
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if alert == nil {
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d.logger.Printf("alerts: check %q references unknown alert %q", check.Name, alertID)
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continue
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}
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if err := d.dispatchOne(alert, msg); err != nil {
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d.logger.Printf("alerts: %q via %s: %v", alert.Name, alert.Type, err)
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}
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}
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}
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// Test sends a one-shot test message to the named alert. Returns an
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// error so the CLI can surface failures interactively.
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func (d *Dispatcher) Test(alertID string) error {
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alert := d.cluster.FindAlert(alertID)
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if alert == nil {
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return fmt.Errorf("alert %q not found", alertID)
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}
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msg := Message{
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Subject: "[quptime] test alert",
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Body: fmt.Sprintf("This is a test of alert %q from node %s.\nIf you see this, the alert channel is wired correctly.\n", alert.Name, d.selfID),
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}
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return d.dispatchOne(alert, msg)
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}
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func (d *Dispatcher) dispatchOne(a *config.Alert, msg Message) error {
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switch a.Type {
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case config.AlertSMTP:
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return sendSMTP(a, msg)
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case config.AlertDiscord:
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return sendDiscord(a, msg)
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default:
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return fmt.Errorf("unknown alert type %q", a.Type)
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}
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}
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