turn relayer into a server framework and put actual relay code into ./basic

basic/postgresql.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"github.com/jmoiron/sqlx"
+	_ "github.com/lib/pq"
+	"github.com/rs/zerolog/log"
+)
+
+func initDB(dburl string) (*sqlx.DB, error) {
+	db, err := sqlx.Connect("postgres", dburl)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = db.Exec(`
+CREATE TABLE IF NOT EXISTS event (
+  id text NOT NULL,
+  pubkey text NOT NULL,
+  created_at integer NOT NULL,
+  kind integer NOT NULL,
+  tags jsonb NOT NULL,
+  content text NOT NULL,
+  sig text NOT NULL
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS ididx ON event (id);
+CREATE UNIQUE INDEX IF NOT EXISTS pubkeytimeidx ON event (pubkey, created_at);
+    `)
+	log.Print(err)
+	return db, nil
+}
+
+const tagConditions = `jsonb_path_match(tags, '$[*][1] == $value', jsonb_build_object('value', ?::text))`