1 files changed, 145 insertions, 0 deletions
diff --git a/deno/mail-relay/db.ts b/deno/mail-relay/db.ts
new file mode 100644
index 0000000..9b05e32
--- /dev/null
+++ b/deno/mail-relay/db.ts
@@ -0,0 +1,145 @@
+// spellchecker: words kysely insertable updateable introspector
+
+import {
+  Generated,
+  Insertable,
+  Kysely,
+  Migration,
+  Migrator,
+  SqliteDatabase,
+  SqliteDialect,
+  SqliteStatement,
+} from "kysely";
+import * as sqlite from "@db/sqlite";
+
+class SqliteStatementAdapter implements SqliteStatement {
+  constructor(public readonly stmt: sqlite.Statement) {}
+
+  get reader(): boolean {
+    return this.stmt.columnNames().length >= 1;
+  }
+
+  all(parameters: readonly unknown[]): unknown[] {
+    return this.stmt.all(...parameters as sqlite.BindValue[]);
+  }
+
+  iterate(parameters: readonly unknown[]): IterableIterator<unknown> {
+    return this.stmt.iter(...parameters as sqlite.BindValue[]);
+  }
+
+  run(
+    parameters: readonly unknown[],
+  ): { changes: number | bigint; lastInsertRowid: number | bigint } {
+    const { db } = this.stmt;
+    const totalChangesBefore = db.totalChanges;
+    const changes = this.stmt.run(...parameters as sqlite.BindValue[]);
+    return {
+      changes: totalChangesBefore === db.totalChanges ? 0 : changes,
+      lastInsertRowid: db.lastInsertRowId,
+    };
+  }
+}
+
+class SqliteDatabaseAdapter implements SqliteDatabase {
+  constructor(public readonly db: sqlite.Database) {}
+
+  prepare(sql: string): SqliteStatementAdapter {
+    return new SqliteStatementAdapter(this.db.prepare(sql));
+  }
+
+  close(): void {
+    this.db.close();
+  }
+}
+
+export class DbError extends Error {
+}
+
+interface AwsMessageIdMapTable {
+  id: Generated<number>;
+  message_id: string;
+  aws_message_id: string;
+}
+
+interface Database {
+  aws_message_id_map: AwsMessageIdMapTable;
+}
+
+const migrations: Record<string, Migration> = {
+  "0001-init": {
+    // deno-lint-ignore no-explicit-any
+    async up(db: Kysely<any>): Promise<void> {
+      await db.schema
+        .createTable("aws_message_id_map")
+        .addColumn("id", "integer", (col) => col.primaryKey().autoIncrement())
+        .addColumn("message_id", "text", (col) => col.notNull().unique())
+        .addColumn("aws_message_id", "text", (col) => col.notNull().unique())
+        .execute();
+
+      for (const column of ["message_id", "aws_message_id"]) {
+        await db.schema
+          .createIndex(`aws_message_id_map_${column}`)
+          .on("aws_message_id_map")
+          .column(column)
+          .execute();
+      }
+    },
+
+    // deno-lint-ignore no-explicit-any
+    async down(db: Kysely<any>): Promise<void> {
+      await db.schema.dropTable("aws_message_id_map").execute();
+    },
+  },
+};
+
+export class DbService {
+  #db;
+  #kysely;
+  #migrator;
+
+  constructor(public readonly path: string) {
+    this.#db = new sqlite.Database(path);
+    this.#kysely = new Kysely<Database>({
+      dialect: new SqliteDialect(
+        { database: new SqliteDatabaseAdapter(this.#db) },
+      ),
+    });
+    this.#migrator = new Migrator({
+      db: this.#kysely,
+      provider: {
+        getMigrations(): Promise<Record<string, Migration>> {
+          return Promise.resolve(migrations);
+        },
+      },
+    });
+  }
+
+  async migrate(): Promise<void> {
+    await this.#migrator.migrateToLatest();
+  }
+
+  async addMessageIdMap(
+    mail: Insertable<AwsMessageIdMapTable>,
+  ): Promise<number> {
+    const inserted = await this.#kysely.insertInto("aws_message_id_map").values(
+      mail,
+    ).executeTakeFirstOrThrow();
+    return Number(inserted.insertId!);
+  }
+
+  async messageIdToAws(messageId: string): Promise<string | null> {
+    const row = await this.#kysely.selectFrom("aws_message_id_map").where(
+      "message_id",
+      "=",
+      messageId,
+    ).select("aws_message_id").executeTakeFirst();
+    return row?.aws_message_id ?? null;
+  }
+
+  async messageIdFromAws(awsMessageId: string): Promise<string | null> {
+    const row = await this.#kysely.selectFrom("aws_message_id_map")
+      .where("aws_message_id", "=", awsMessageId).select("message_id")
+      .executeTakeFirst();
+    return row?.message_id ?? null;
+  }
+}