config.sample.yaml

@@ -33,5 +33,11 @@ alerting:
   renotify: 30m
 notify:
   - provider: slackwebhook
+#   subjectTemplate: "Stillbox Alert ({{ highest . }})"
+#   bodyTemplate: |
+#     {{ range . -}}
+#     {{ .TGName }} is active with a score of {{ f .Score.Score 4 }}! ({{ f .Score.RecentCount 0 }}/{{ .Score.Count }} recent calls)
+#
+#     {{ end -}}
     config:
       webhookURL: "http://somewhere"

internal/common/common.go

@@ -1,9 +1,6 @@
 package common
 
 import (
-	"fmt"
-	"strconv"
-
 	"github.com/spf13/cobra"
 )
 
@@ -47,10 +44,3 @@ func PtrOrNull[T comparable](val T) *T {
 
 	return &val
 }
-
-func FmtFloat(v float64, places ...int) string {
-	if len(places) > 0 {
-		return fmt.Sprintf("%."+strconv.Itoa(places[0])+"f", v)
-	}
-	return fmt.Sprintf("%.4f", v)
-}

internal/common/template.go

@@ -0,0 +1,48 @@
+package common
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"text/template"
+	"time"
+
+	"dynatron.me/x/stillbox/internal/jsontime"
+)
+
+var (
+	FuncMap = template.FuncMap{
+		"f": fmtFloat,
+		"dict": func(values ...interface{}) (map[string]interface{}, error) {
+			if len(values)%2 != 0 {
+				return nil, errors.New("invalid dict call")
+			}
+			dict := make(map[string]interface{}, len(values)/2)
+			for i := 0; i < len(values); i += 2 {
+				key, ok := values[i].(string)
+				if !ok {
+					return nil, errors.New("dict keys must be strings")
+				}
+				dict[key] = values[i+1]
+			}
+			return dict, nil
+		},
+		"formTime": func(t jsontime.Time) string {
+			return time.Time(t).Format("2006-01-02T15:04")
+		},
+		"ago": func(s string) (string, error) {
+			d, err := time.ParseDuration(s)
+			if err != nil {
+				return "", err
+			}
+			return time.Now().Add(-d).Format("2006-01-02T15:04"), nil
+		},
+	}
+)
+
+func fmtFloat(v float64, places ...int) string {
+	if len(places) > 0 {
+		return fmt.Sprintf("%."+strconv.Itoa(places[0])+"f", v)
+	}
+	return fmt.Sprintf("%.4f", v)
+}

pkg/alerting/alert/alert.go

@@ -0,0 +1,81 @@
+package alert
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+	"time"
+
+	"dynatron.me/x/stillbox/internal/trending"
+	"dynatron.me/x/stillbox/pkg/database"
+	"dynatron.me/x/stillbox/pkg/talkgroups"
+
+	"github.com/google/uuid"
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+type Alert struct {
+	ID         uuid.UUID
+	Timestamp  time.Time
+	TGName     string
+	Score      trending.Score[talkgroups.ID]
+	OrigScore  float64
+	Weight     float32
+	Suppressed bool
+}
+
+func (a *Alert) ToAddAlertParams() database.AddAlertParams {
+	f32score := float32(a.Score.Score)
+	f32origscore := float32(a.OrigScore)
+
+	var origScore *float32
+	if a.Score.Score != a.OrigScore {
+		origScore = &f32origscore
+	}
+
+	return database.AddAlertParams{
+		ID:        a.ID,
+		Time:      pgtype.Timestamptz{Time: a.Timestamp, Valid: true},
+		PackedTg:  a.Score.ID.Pack(),
+		Weight:    &a.Weight,
+		Score:     &f32score,
+		OrigScore: origScore,
+		Notified:  !a.Suppressed,
+	}
+}
+
+// makeAlert creates a notification for later rendering by the template.
+// It takes a talkgroup Score as input.
+func Make(ctx context.Context, store talkgroups.Store, score trending.Score[talkgroups.ID], origScore float64) (Alert, error) {
+	d := Alert{
+		ID:        uuid.New(),
+		Score:     score,
+		Timestamp: time.Now(),
+		Weight:    1.0,
+		OrigScore: origScore,
+	}
+
+	tgRecord, err := store.TG(ctx, score.ID)
+	switch err {
+	case nil:
+		d.Weight = tgRecord.Talkgroup.Weight
+		if tgRecord.System.Name == "" {
+			tgRecord.System.Name = strconv.Itoa(int(score.ID.System))
+		}
+
+		if tgRecord.Talkgroup.Name != nil {
+			d.TGName = fmt.Sprintf("%s %s (%d)", tgRecord.System.Name, *tgRecord.Talkgroup.Name, score.ID.Talkgroup)
+		} else {
+			d.TGName = fmt.Sprintf("%s:%d", tgRecord.System.Name, int(score.ID.Talkgroup))
+		}
+	default:
+		system, has := store.SystemName(ctx, int(score.ID.System))
+		if has {
+			d.TGName = fmt.Sprintf("%s:%d", system, int(score.ID.Talkgroup))
+		} else {
+			d.TGName = fmt.Sprintf("%d:%d", int(score.ID.System), int(score.ID.Talkgroup))
+		}
+	}
+
+	return d, nil
+}

pkg/alerting/alerting.go

@@ -1,16 +1,14 @@
 package alerting
 
 import (
-	"bytes"
 	"context"
 	"fmt"
 	"net/http"
 	"sort"
-	"strconv"
 	"sync"
-	"text/template"
 	"time"
 
+	"dynatron.me/x/stillbox/pkg/alerting/alert"
 	"dynatron.me/x/stillbox/pkg/calls"
 	"dynatron.me/x/stillbox/pkg/config"
 	"dynatron.me/x/stillbox/pkg/database"
@@ -21,8 +19,6 @@ import (
 	"dynatron.me/x/stillbox/internal/timeseries"
 	"dynatron.me/x/stillbox/internal/trending"
 
-	"github.com/google/uuid"
-	"github.com/jackc/pgx/v5/pgtype"
 	"github.com/rs/zerolog/log"
 )
 
@@ -51,7 +47,7 @@ type alerter struct {
 	scores     trending.Scores[talkgroups.ID]
 	lastScore  time.Time
 	sim        *Simulation
-	alertCache map[talkgroups.ID]Alert
+	alertCache map[talkgroups.ID]alert.Alert
 	renotify   time.Duration
 	notifier   notify.Notifier
 	tgCache    talkgroups.Store
@@ -96,7 +92,7 @@ func New(cfg config.Alerting, tgCache talkgroups.Store, opts ...AlertOption) Ale
 
 	as := &alerter{
 		cfg:        cfg,
-		alertCache: make(map[talkgroups.ID]Alert),
+		alertCache: make(map[talkgroups.ID]alert.Alert),
 		clock:      timeseries.DefaultClock,
 		renotify:   DefaultRenotify,
 		tgCache:    tgCache,
@@ -150,22 +146,18 @@ func (as *alerter) Go(ctx context.Context) {
 
 }
 
-const notificationTemplStr = `{{ range . -}}
+func (as *alerter) eval(ctx context.Context, now time.Time, testMode bool) ([]alert.Alert, error) {
-{{ .TGName }} is active with a score of {{ f .Score.Score 4 }}! ({{ f .Score.RecentCount 0 }}/{{ .Score.Count }} recent calls)
-
-{{ end -}}`
-
-var notificationTemplate = template.Must(template.New("notification").Funcs(funcMap).Parse(notificationTemplStr))
-
-func (as *alerter) eval(ctx context.Context, now time.Time, testMode bool) ([]Alert, error) {
 	err := as.tgCache.Hint(ctx, as.scoredTGs())
 	if err != nil {
 		return nil, fmt.Errorf("prime TG cache: %w", err)
 	}
 
+	as.Lock()
+	defer as.Unlock()
+
 	db := database.FromCtx(ctx)
 
-	var notifications []Alert
+	var notifications []alert.Alert
 	for _, s := range as.scores {
 		origScore := s.Score
 		tgr, err := as.tgCache.TG(ctx, s.ID)
@@ -176,7 +168,7 @@ func (as *alerter) eval(ctx context.Context, now time.Time, testMode bool) ([]Al
 		if s.Score > as.cfg.AlertThreshold || testMode {
 			if old, inCache := as.alertCache[s.ID]; !inCache || now.Sub(old.Timestamp) > as.renotify {
 				s.Score *= as.tgCache.Weight(ctx, s.ID, now)
-				a, err := as.makeAlert(ctx, s, origScore)
+				a, err := alert.Make(ctx, as.tgCache, s, origScore)
 				if err != nil {
 					return nil, fmt.Errorf("makeAlert: %w", err)
 				}
@@ -206,7 +198,7 @@ func (as *alerter) eval(ctx context.Context, now time.Time, testMode bool) ([]Al
 }
 
 func (as *alerter) testNotifyHandler(w http.ResponseWriter, r *http.Request) {
-	alerts := make([]Alert, 0, len(as.scores))
+	alerts := make([]alert.Alert, 0, len(as.scores))
 	ctx := r.Context()
 
 	alerts, err := as.eval(ctx, time.Now(), true)
@@ -216,7 +208,7 @@ func (as *alerter) testNotifyHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	err = as.sendNotification(ctx, alerts)
+	err = as.notifier.Send(ctx, alerts)
 	if err != nil {
 		log.Error().Err(err).Msg("test notification send")
 		http.Error(w, err.Error(), http.StatusInternalServerError)
@@ -258,92 +250,12 @@ func (as *alerter) notify(ctx context.Context) error {
 	}
 
 	if len(notifications) > 0 {
-		return as.sendNotification(ctx, notifications)
+		return as.notifier.Send(ctx, notifications)
 	}
 
 	return nil
 }
 
-type Alert struct {
-	ID         uuid.UUID
-	Timestamp  time.Time
-	TGName     string
-	Score      trending.Score[talkgroups.ID]
-	OrigScore  float64
-	Weight     float32
-	Suppressed bool
-}
-
-func (a *Alert) ToAddAlertParams() database.AddAlertParams {
-	f32score := float32(a.Score.Score)
-	f32origscore := float32(a.OrigScore)
-
-	var origScore *float32
-	if a.Score.Score != a.OrigScore {
-		origScore = &f32origscore
-	}
-
-	return database.AddAlertParams{
-		ID:        a.ID,
-		Time:      pgtype.Timestamptz{Time: a.Timestamp, Valid: true},
-		PackedTg:  a.Score.ID.Pack(),
-		Weight:    &a.Weight,
-		Score:     &f32score,
-		OrigScore: origScore,
-		Notified:  !a.Suppressed,
-	}
-}
-
-// sendNotification renders and sends the notification.
-func (as *alerter) sendNotification(ctx context.Context, n []Alert) error {
-	msgBuffer := new(bytes.Buffer)
-
-	err := notificationTemplate.Execute(msgBuffer, n)
-	if err != nil {
-		return fmt.Errorf("notification template render: %w", err)
-	}
-
-	log.Debug().Str("msg", msgBuffer.String()).Msg("notifying")
-
-	return as.notifier.Send(ctx, NotificationSubject, msgBuffer.String())
-}
-
-// makeAlert creates a notification for later rendering by the template.
-// It takes a talkgroup Score as input.
-func (as *alerter) makeAlert(ctx context.Context, score trending.Score[talkgroups.ID], origScore float64) (Alert, error) {
-	d := Alert{
-		ID:        uuid.New(),
-		Score:     score,
-		Timestamp: time.Now(),
-		Weight:    1.0,
-		OrigScore: origScore,
-	}
-
-	tgRecord, err := as.tgCache.TG(ctx, score.ID)
-	switch err {
-	case nil:
-		d.Weight = tgRecord.Talkgroup.Weight
-		if tgRecord.System.Name == "" {
-			tgRecord.System.Name = strconv.Itoa(int(score.ID.System))
-		}
-
-		if tgRecord.Talkgroup.Name != nil {
-			d.TGName = fmt.Sprintf("%s %s (%d)", tgRecord.System.Name, *tgRecord.Talkgroup.Name, score.ID.Talkgroup)
-		} else {
-			d.TGName = fmt.Sprintf("%s:%d", tgRecord.System.Name, int(score.ID.Talkgroup))
-		}
-	default:
-		system, has := as.tgCache.SystemName(ctx, int(score.ID.System))
-		if has {
-			d.TGName = fmt.Sprintf("%s:%d", system, int(score.ID.Talkgroup))
-		} else {
-			d.TGName = fmt.Sprintf("%d:%d", int(score.ID.System), int(score.ID.Talkgroup))
-		}
-	}
-
-	return d, nil
-}
-
 // cleanCache clears the cache of aged-out entries
 func (as *alerter) cleanCache() {
 	if as.notifier == nil {

pkg/alerting/stats.go

@@ -2,7 +2,6 @@ package alerting
 
 import (
 	_ "embed"
-	"errors"
 	"html/template"
 	"net/http"
 	"time"
@@ -12,7 +11,6 @@ import (
 	"dynatron.me/x/stillbox/pkg/talkgroups"
 
 	"dynatron.me/x/stillbox/internal/common"
-	"dynatron.me/x/stillbox/internal/jsontime"
 	"dynatron.me/x/stillbox/internal/trending"
 
 	"github.com/go-chi/chi/v5"
@@ -22,41 +20,14 @@ import (
 //go:embed stats.html
 var statsTemplateFile string
 
+var (
+	statTmpl = template.Must(template.New("stats").Funcs(common.FuncMap).Parse(statsTemplateFile))
+)
+
 type stats interface {
 	PrivateRoutes(chi.Router)
 }
 
-var (
-	funcMap = template.FuncMap{
-		"f": common.FmtFloat,
-		"dict": func(values ...interface{}) (map[string]interface{}, error) {
-			if len(values)%2 != 0 {
-				return nil, errors.New("invalid dict call")
-			}
-			dict := make(map[string]interface{}, len(values)/2)
-			for i := 0; i < len(values); i += 2 {
-				key, ok := values[i].(string)
-				if !ok {
-					return nil, errors.New("dict keys must be strings")
-				}
-				dict[key] = values[i+1]
-			}
-			return dict, nil
-		},
-		"formTime": func(t jsontime.Time) string {
-			return time.Time(t).Format("2006-01-02T15:04")
-		},
-		"ago": func(s string) (string, error) {
-			d, err := time.ParseDuration(s)
-			if err != nil {
-				return "", err
-			}
-			return time.Now().Add(-d).Format("2006-01-02T15:04"), nil
-		},
-	}
-	statTmpl = template.Must(template.New("stats").Funcs(funcMap).Parse(statsTemplateFile))
-)
-
 func (as *alerter) PrivateRoutes(r chi.Router) {
 	r.Get("/tgstats", as.tgStatsHandler)
 	r.Post("/tgstats", as.simulateHandler)

pkg/config/config.go

@@ -65,8 +65,10 @@ type Alerting struct {
 type Notify []NotifyService
 
 type NotifyService struct {
-	Provider string                 `json:"provider"`
+	Provider        string                 `yaml:"provider" json:"provider"`
-	Config   map[string]interface{} `json:"config"`
+	SubjectTemplate *string                `yaml:"subjectTemplate" json:"subjectTemplate"`
+	BodyTemplate    *string                `yaml:"bodyTemplate" json:"bodyTemplate"`
+	Config          map[string]interface{} `yaml:"config" json:"config"`
 }
 
 func (n *NotifyService) GetS(k, defaultVal string) string {

pkg/notify/notify.go

@@ -1,10 +1,15 @@
 package notify
 
 import (
+	"bytes"
+	"context"
 	"fmt"
 	stdhttp "net/http"
+	"text/template"
 	"time"
 
+	"dynatron.me/x/stillbox/internal/common"
+	"dynatron.me/x/stillbox/pkg/alerting/alert"
 	"dynatron.me/x/stillbox/pkg/config"
 
 	"github.com/go-viper/mapstructure/v2"
@@ -13,15 +18,70 @@ import (
 )
 
 type Notifier interface {
-	notify.Notifier
+	Send(ctx context.Context, alerts []alert.Alert) error
+}
+
+type backend struct {
+	*notify.Notify
+	subject *template.Template
+	body    *template.Template
 }
 
 type notifier struct {
-	*notify.Notify
+	backends []backend
 }
 
-func (n *notifier) buildSlackWebhookPayload(cfg *slackWebhookConfig) func(string, string) any {
+func highest(a []alert.Alert) string {
+	if len(a) < 1 {
+		return "none"
+	}
 
+	top := a[0]
+	for _, a := range a {
+		if a.Score.Score > top.Score.Score {
+			top = a
+		}
+	}
+
+	return top.TGName
+}
+
+var alertFm = template.FuncMap{
+	"highest": highest,
+}
+
+const defaultBodyTemplStr = `{{ range . -}}
+{{ .TGName }} is active with a score of {{ f .Score.Score 4 }}! ({{ f .Score.RecentCount 0 }}/{{ .Score.Count }} recent calls)
+
+{{ end -}}`
+
+var defaultBodyTemplate = template.Must(template.New("body").Funcs(common.FuncMap).Funcs(alertFm).Parse(defaultBodyTemplStr))
+
+var defaultSubjectTemplStr = `Stillbox Alert ({{ highest . }}`
+var defaultSubjectTemplate = template.Must(template.New("subject").Funcs(common.FuncMap).Funcs(alertFm).Parse(defaultSubjectTemplStr))
+
+// Send renders and sends the Alerts.
+func (b *backend) Send(ctx context.Context, alerts []alert.Alert) (err error) {
+	var subject, body bytes.Buffer
+	err = b.subject.ExecuteTemplate(&subject, "subject", alerts)
+	if err != nil {
+		return err
+	}
+
+	err = b.body.ExecuteTemplate(&body, "body", alerts)
+	if err != nil {
+		return err
+	}
+
+	err = b.Notify.Send(ctx, subject.String(), body.String())
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func buildSlackWebhookPayload(cfg *slackWebhookConfig) func(string, string) any {
 	type Attachment struct {
 		Title     string `json:"title"`
 		Text      string `json:"text"`
@@ -56,9 +116,35 @@ type slackWebhookConfig struct {
 	WebhookURL      string `mapstructure:"webhookURL"`
 	Icon            string `mapstructure:"icon"`
 	MessageURL      string `mapstructure:"messageURL"`
+	SubjectTemplate string `mapstructure:"subjectTemplate"`
+	BodyTemplate    string `mapstructure:"bodyTemplate"`
 }
 
-func (n *notifier) addService(cfg config.NotifyService) error {
+func (n *notifier) addService(cfg config.NotifyService) (err error) {
+	be := backend{}
+
+	switch cfg.SubjectTemplate {
+	case nil:
+		be.subject = defaultSubjectTemplate
+	default:
+		be.subject, err = template.New("subject").Funcs(common.FuncMap).Funcs(alertFm).Parse(*cfg.SubjectTemplate)
+		if err != nil {
+			return err
+		}
+	}
+
+	switch cfg.BodyTemplate {
+	case nil:
+		be.body = defaultBodyTemplate
+	default:
+		be.body, err = template.New("body").Funcs(common.FuncMap).Funcs(alertFm).Parse(*cfg.BodyTemplate)
+		if err != nil {
+			return err
+		}
+	}
+
+	be.Notify = notify.New()
+
 	switch cfg.Provider {
 	case "slackwebhook":
 		swc := &slackWebhookConfig{
@@ -74,20 +160,31 @@ func (n *notifier) addService(cfg config.NotifyService) error {
 			Header:       make(stdhttp.Header),
 			Method:       stdhttp.MethodPost,
 			URL:          swc.WebhookURL,
-			BuildPayload: n.buildSlackWebhookPayload(swc),
+			BuildPayload: buildSlackWebhookPayload(swc),
 		})
-		n.UseServices(hs)
+		be.UseServices(hs)
 	default:
 		return fmt.Errorf("unknown provider '%s'", cfg.Provider)
 	}
 
+	n.backends = append(n.backends, be)
+
+	return nil
+}
+
+func (n *notifier) Send(ctx context.Context, alerts []alert.Alert) error {
+	for _, be := range n.backends {
+		err := be.Send(ctx, alerts)
+		if err != nil {
+			return err
+		}
+	}
+
 	return nil
 }
 
 func New(cfg config.Notify) (Notifier, error) {
-	n := &notifier{
+	n := new(notifier)
-		Notify: notify.NewWithServices(),
-	}
 
 	for _, s := range cfg {
 		err := n.addService(s)

pkg/talkgroups/talkgroup.go

@@ -12,6 +12,11 @@ type Talkgroup struct {
 	Learned bool            `json:"learned"`
 }
 
+type Names struct {
+	System    string
+	Talkgroup string
+}
+
 type ID struct {
 	System    uint32 `json:"sys"`
 	Talkgroup uint32 `json:"tg"`