Complete and use the SQL backed silence provider

main.go

@@ -41,7 +41,12 @@ func main() {
 
 	alerts := provider.NewMemAlerts(data)
 	notifies := provider.NewMemNotifies(data)
-	silences := provider.NewMemSilences()
+	// silences := provider.NewMemSilences()
+	silences, err := provider.NewSQLSilences()
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer silences.Close()
 
 	inhibitor := &Inhibitor{alerts: alerts}
 

provider/sql.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 
 	"github.com/cznic/ql"
+	"github.com/prometheus/common/log"
 	"github.com/prometheus/common/model"
 
 	"github.com/prometheus/alertmanager/types"
@@ -56,6 +57,18 @@ CREATE INDEX IF NOT EXISTS silences_id  ON silences (id());
 `
 
 func (s *SQLSilences) Mutes(lset model.LabelSet) bool {
+	sils, err := s.All()
+	if err != nil {
+		log.Errorf("retrieving silences failed: %s", err)
+		// In doubt, do not silence anything.
+		return false
+	}
+
+	for _, sil := range sils {
+		if sil.Mutes(lset) {
+			return true
+		}
+	}
 	return false
 }
 
@@ -126,10 +139,38 @@ func (s *SQLSilences) Set(sil *types.Silence) (uint64, error) {
 	return uint64(sid), nil
 }
 
-func (s *SQLSilences) Del(uint64) error {
+func (s *SQLSilences) Del(sid uint64) error {
+	tx, err := s.db.Begin()
+	if err != nil {
+		return err
+	}
+
+	if _, err := tx.Exec(`DELETE FROM silences WHERE id() == $1`, sid); err != nil {
+		tx.Rollback()
+		return err
+	}
+	tx.Commit()
+
 	return nil
 }
 
-func (s *SQLSilences) Get(uint64) (*types.Silence, error) {
-	return nil, nil
+func (s *SQLSilences) Get(sid uint64) (*types.Silence, error) {
+	row := s.db.QueryRow(`SELECT id(), matchers, starts_at, ends_at, created_at, created_by, comment FROM silences WHERE id() == $1`, sid)
+
+	var (
+		sil      types.Silence
+		matchers string
+	)
+	err := row.Scan(&sil.ID, &matchers, &sil.StartsAt, &sil.EndsAt, &sil.CreatedAt, &sil.CreatedBy, &sil.Comment)
+	if err == sql.ErrNoRows {
+		return nil, ErrNotFound
+	}
+	if err != nil {
+		return nil, err
+	}
+	if err := json.Unmarshal([]byte(matchers), &sil.Matchers); err != nil {
+		return nil, err
+	}
+
+	return &sil, nil
 }