notifications: postgres datastore implementation

postgresql/migrations/000013_notification_subscription.down.sql

@@ -0,0 +1,3 @@
+DROP INDEX notification_subscriptions_pubkey_url_key;
+DROP INDEX notification_subscriptions_pubkey_idx;
+DROP TABLE public.notification_subscriptions;

postgresql/migrations/000013_notification_subscription.up.sql

@@ -0,0 +1,10 @@
+CREATE TABLE public.notification_subscriptions (
+    id bigserial primary key,
+	pubkey bytea NOT NULL,
+	url varchar NOT NULL,
+	created_at bigint NOT NULL,
+	refreshed_at bigint NOT NULL
+);
+
+CREATE INDEX notification_subscriptions_pubkey_idx ON public.notification_subscriptions (pubkey);
+CREATE UNIQUE INDEX notification_subscriptions_pubkey_url_key ON public.notification_subscriptions (pubkey, url);

postgresql/notifications_store.go

@@ -0,0 +1,76 @@
+package postgresql
+
+import (
+	"context"
+	"encoding/hex"
+	"time"
+
+	"github.com/jackc/pgx/v4/pgxpool"
+)
+
+type NotificationsStore struct {
+	pool *pgxpool.Pool
+}
+
+func NewNotificationsStore(pool *pgxpool.Pool) *NotificationsStore {
+	return &NotificationsStore{pool: pool}
+}
+
+func (s *NotificationsStore) Register(
+	ctx context.Context,
+	pubkey string,
+	url string,
+) error {
+	pk, err := hex.DecodeString(pubkey)
+	if err != nil {
+		return err
+	}
+
+	now := time.Now().UnixMicro()
+	_, err = s.pool.Exec(
+		ctx,
+		`INSERT INTO public.notification_subscriptions (pubkey, url, created_at, refreshed_at)
+		 values ($1, $2, $3, $4)
+		 ON CONFLICT (pubkey, url) DO UPDATE SET refreshed_at = $4`,
+		pk,
+		url,
+		now,
+		now,
+	)
+
+	return err
+}
+
+func (s *NotificationsStore) GetRegistrations(
+	ctx context.Context,
+	pubkey string,
+) ([]string, error) {
+	pk, err := hex.DecodeString(pubkey)
+	if err != nil {
+		return nil, err
+	}
+
+	rows, err := s.pool.Query(
+		ctx,
+		`SELECT url 
+		 FROM public.notification_subscriptions
+		 WHERE pubkey = $1`,
+		pk,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	var result []string
+	for rows.Next() {
+		var url string
+		err = rows.Scan(&url)
+		if err != nil {
+			return nil, err
+		}
+
+		result = append(result, url)
+	}
+
+	return result, nil
+}