snapshot of https://github.com/raimohanska/ourboard.git (master, 2026-09-23; blobs > 131072B omitted)

backend/src/db.ts

@@ -0,0 +1,72 @@
+import pg, { PoolClient } from "pg"
+import process from "process"
+import migrate from "node-pg-migrate"
+
+const DATABASE_URL = process.env.DATABASE_URL ?? "postgres://r-board:secret@127.0.0.1:13338/r-board"
+const DATABASE_SSL_ENABLED = process.env.DATABASE_SSL_ENABLED === "true"
+
+const pgConfig = {
+    connectionString: DATABASE_URL,
+    ssl: DATABASE_SSL_ENABLED
+        ? {
+              rejectUnauthorized: false,
+          }
+        : undefined,
+}
+const connectionPool = new pg.Pool(pgConfig)
+
+export function closeConnectionPool() {
+    connectionPool.end()
+}
+
+export async function initDB(backendDir: string = ".") {
+    console.log("Running database migrations")
+    await inTransaction((client) =>
+        migrate({
+            count: 100000,
+            databaseUrl: DATABASE_URL,
+            migrationsTable: "pgmigrations",
+            dir: `${backendDir}/migrations`,
+            direction: "up",
+            dbClient: client,
+        }),
+    )
+    console.log("Completed database migrations")
+
+    return {
+        onEvent: async (eventNames: string[], cb: (n: pg.Notification) => any) => {
+            const client = await connectionPool.connect()
+            eventNames.map((e) => client.query(`LISTEN ${e}`))
+            client.on("notification", cb)
+        },
+    }
+}
+
+export async function withDBClient<T>(f: (client: PoolClient) => Promise<T>): Promise<T> {
+    const client = await connectionPool.connect()
+    try {
+        await client.query("BEGIN;SET SESSION CHARACTERISTICS AS TRANSACTION READ ONLY;")
+        return await f(client)
+    } finally {
+        await client.query("ROLLBACK;")
+        client.release()
+    }
+}
+
+export async function inTransaction<T>(f: (client: PoolClient) => Promise<T>): Promise<T> {
+    const client = await connectionPool.connect()
+    try {
+        await client.query(`
+            BEGIN;
+            SET SESSION CHARACTERISTICS AS TRANSACTION READ WRITE;
+        `)
+        const result = await f(client)
+        await client.query("COMMIT;")
+        return result
+    } catch (e) {
+        await client.query("ROLLBACK;")
+        throw e
+    } finally {
+        client.release()
+    }
+}