Add opsgenie notifier

config/config.go

@@ -163,6 +163,17 @@ func (c *Config) UnmarshalYAML(unmarshal func(interface{}) error) error {
 				pdc.URL = c.Global.PagerdutyURL
 			}
 		}
+		for _, ogc := range rcv.OpsGenieConfigs {
+			if ogc.APIHost == "" {
+				if c.Global.OpsGenieAPIHost == "" {
+					return fmt.Errorf("no global OpsGenie URL set")
+				}
+				ogc.APIHost = c.Global.OpsGenieAPIHost
+			}
+			if !strings.HasSuffix(ogc.APIHost, "/") {
+				ogc.APIHost += "/"
+			}
+		}
 		names[rcv.Name] = struct{}{}
 	}
 	return checkOverflow(c.XXX, "config")
@@ -170,16 +181,18 @@ func (c *Config) UnmarshalYAML(unmarshal func(interface{}) error) error {
 
 // DefaultGlobalConfig provides global default values.
 var DefaultGlobalConfig = GlobalConfig{
-	PagerdutyURL: "https://events.pagerduty.com/generic/2010-04-15/create_event.json",
+	PagerdutyURL:    "https://events.pagerduty.com/generic/2010-04-15/create_event.json",
+	OpsGenieAPIHost: "https://api.opsgenie.com/",
 }
 
 // GlobalConfig defines configuration parameters that are valid globally
 // unless overwritten.
 type GlobalConfig struct {
-	SMTPFrom      string `yaml:"smtp_from"`
-	SMTPSmarthost string `yaml:"smtp_smarthost"`
-	SlackURL      string `yaml:"slack_url"`
-	PagerdutyURL  string `yaml:"pagerduty_url"`
+	SMTPFrom        string `yaml:"smtp_from"`
+	SMTPSmarthost   string `yaml:"smtp_smarthost"`
+	SlackURL        string `yaml:"slack_url"`
+	PagerdutyURL    string `yaml:"pagerduty_url"`
+	OpsGenieAPIHost string `yaml:"opsgenie_api_host"`
 }
 
 // UnmarshalYAML implements the yaml.Unmarshaler interface.
@@ -309,6 +322,7 @@ type Receiver struct {
 	PushoverConfigs  []*PushoverConfig  `yaml:"pushover_configs"`
 	SlackConfigs     []*SlackConfig     `yaml:"slack_configs"`
 	WebhookConfigs   []*WebhookConfig   `yaml:"webhook_configs"`
+	OpsGenieConfigs  []*OpsGenieConfig  `yaml:"opsgenie_configs"`
 
 	// Catches all undefined fields and must be empty after parsing.
 	XXX map[string]interface{} `yaml:",inline"`

config/notifies.go

@@ -47,6 +47,12 @@ var (
 		Text:      `{{template "slack.default.text" . }}`,
 		Fallback:  `{{template "slack.default.fallback" . }}`,
 	}
+
+	// DefaultOpsGenieConfig defines default values for OpsGenie configurations.
+	DefaultOpsGenieConfig = OpsGenieConfig{
+		Description: `{{template "opsgenie.default.description" .}}`,
+		// TODO: Add a details field with all the alerts.
+	}
 )
 
 // FlowdockConfig configures notifications via Flowdock.
@@ -280,3 +286,27 @@ func (c *WebhookConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	}
 	return checkOverflow(c.XXX, "slack config")
 }
+
+// OpsGenieConfig configures notifications via OpsGenie.
+type OpsGenieConfig struct {
+	APIKey      string            `yaml:"api_key"`
+	APIHost     string            `yaml:"api_host"`
+	Description string            `yaml:"description"`
+	Details     map[string]string `yaml:"details"`
+
+	// Catches all undefined fields and must be empty after parsing.
+	XXX map[string]interface{} `yaml:",inline"`
+}
+
+// UnmarshalYAML implements the yaml.Unmarshaler interface.
+func (c *OpsGenieConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	*c = DefaultOpsGenieConfig
+	type plain OpsGenieConfig
+	if err := unmarshal((*plain)(c)); err != nil {
+		return err
+	}
+	if c.APIKey == "" {
+		return fmt.Errorf("missing service key in OpsGenie config")
+	}
+	return checkOverflow(c.XXX, "opsgenie config")
+}

notify/impl.go

@@ -58,6 +58,9 @@ func Build(confs []*config.Receiver, tmpl *template.Template) map[string]Fanout
 		for i, c := range nc.PagerdutyConfigs {
 			add(i, NewPagerDuty(c, tmpl))
 		}
+		for i, c := range nc.OpsGenieConfigs {
+			add(i, NewOpsGenie(c, tmpl))
+		}
 
 		res[nc.Name] = fo
 	}
@@ -516,3 +519,93 @@ func (n *Slack) Notify(ctx context.Context, as ...*types.Alert) error {
 
 	return nil
 }
+
+// OpsGenie implements a Notifier for OpsGenie notifications.
+type OpsGenie struct {
+	conf *config.OpsGenieConfig
+	tmpl *template.Template
+}
+
+// NewOpsGenieDuty returns a new OpsGenie notifier.
+func NewOpsGenie(c *config.OpsGenieConfig, t *template.Template) *OpsGenie {
+	return &OpsGenie{conf: c, tmpl: t}
+}
+
+type opsGenieMessage struct {
+	APIKey string            `json:"apiKey"`
+	Alias  model.Fingerprint `json:"alias"`
+}
+
+type opsGenieCreateMessage struct {
+	*opsGenieMessage `json:,inline`
+	Message          string            `json:"message"`
+	Details          map[string]string `json:"details"`
+}
+
+type opsGenieCloseMessage struct {
+	*opsGenieMessage `json:,inline`
+}
+
+// Notify implements the Notifier interface.
+func (n *OpsGenie) Notify(ctx context.Context, as ...*types.Alert) error {
+	data := generateTemplateData(ctx, as...)
+
+	key, ok := GroupKey(ctx)
+	if !ok {
+		return fmt.Errorf("group key missing")
+	}
+
+	log.With("incident", key).Debugln("notifying OpsGenie")
+
+	var err error
+	tmpl := func(name string) (s string) {
+		if err != nil {
+			return
+		}
+		s, err = n.tmpl.ExecuteTextString(name, data)
+		return s
+	}
+	details := make(map[string]string, len(n.conf.Details))
+	for k, v := range n.conf.Details {
+		details[k] = tmpl(v)
+	}
+
+	var (
+		msg    interface{}
+		apiURL string
+	)
+
+	apiMsg := opsGenieMessage{
+		APIKey: n.conf.APIKey,
+		Alias:  key,
+	}
+	alerts := types.Alerts(as...)
+	switch alerts.Status() {
+	case model.AlertResolved:
+		apiURL = n.conf.APIHost + "v1/json/alert/close"
+		msg = &opsGenieCloseMessage{&apiMsg}
+	default:
+		apiURL = n.conf.APIHost + "v1/json/alert"
+		msg = &opsGenieCreateMessage{
+			opsGenieMessage: &apiMsg,
+			Message:         tmpl(n.conf.Description),
+			Details:         details,
+		}
+	}
+
+	var buf bytes.Buffer
+	if err := json.NewEncoder(&buf).Encode(msg); err != nil {
+		return err
+	}
+
+	resp, err := ctxhttp.Post(ctx, http.DefaultClient, apiURL, contentTypeJSON, &buf)
+	if err != nil {
+		return err
+	}
+	resp.Body.Close()
+
+	if resp.StatusCode/100 != 2 {
+		return fmt.Errorf("unexpected status code %v", resp.StatusCode)
+	}
+	return nil
+}

template/default.tmpl

@@ -17,6 +17,8 @@
 
 {{ define "email.default.subject" }}{{ template "__subject" . }}{{ end }}
 
+{{ define "opsgenie.default.description" }}{{ template "__subject" . }}{{ end }}
+
 {{ define "email.default.html" }}
 {{/*