Return row value direct in .first() and .first_or(x)

README.md

@@ -14,9 +14,9 @@ The glue for TypeScript to PostgreSQL.
 ## Installation
 
 ```ts
-import pglue from "https://git.lua.re/luaneko/pglue/raw/tag/v0.1.3/mod.ts";
+import pglue from "https://git.lua.re/luaneko/pglue/raw/tag/v0.3.0/mod.ts";
 // ...or from github:
-import pglue from "https://raw.githubusercontent.com/luaneko/pglue/refs/tags/v0.1.3/mod.ts";
+import pglue from "https://raw.githubusercontent.com/luaneko/pglue/refs/tags/v0.3.0/mod.ts";
 ```
 
 ## Documentation

deno.json

@@ -1,5 +1,5 @@
 {
   "name": "@luaneko/pglue",
-  "version": "0.1.3",
+  "version": "0.3.0",
   "exports": "./mod.ts"
 }

mod.ts

@@ -8,7 +8,7 @@ import {
   union,
   unknown,
 } from "./valita.ts";
-import { Pool, wire_connect, type LogLevel } from "./wire.ts";
+import { Pool, wire_connect } from "./wire.ts";
 import { sql_types, type SqlTypeMap } from "./query.ts";
 
 export {
@@ -27,11 +27,10 @@ export {
   sql,
   is_sql,
   Query,
-  type Row,
-  type CommandResult,
   type Result,
-  type Results,
+  type Row,
-  type ResultStream,
+  type Rows,
+  type RowStream,
 } from "./query.ts";
 
 export type Options = {
@@ -61,6 +60,7 @@ const ParsedOptions = object({
   runtime_params: record(string()).optional(() => ({})),
   max_connections: number().optional(() => 10),
   idle_timeout: number().optional(() => 20),
+  reconnect_delay: number().optional(() => 5),
   types: record(unknown())
     .optional(() => ({}))
     .map((types): SqlTypeMap => ({ ...sql_types, ...types })),
@@ -101,10 +101,6 @@ export function connect(s: string, options: Options = {}) {
 
 postgres.connect = connect;
 
-export type PostgresEvents = {
-  log(level: LogLevel, ctx: object, msg: string): void;
-};
-
 export class Postgres extends Pool {
   readonly #options;
 
@@ -113,8 +109,9 @@ export class Postgres extends Pool {
     this.#options = options;
   }
 
-  async connect() {
+  async connect(options: Options = {}) {
-    const wire = await wire_connect(this.#options);
+    const opts = ParsedOptions.parse({ ...this.#options, ...options });
+    const wire = await wire_connect(opts);
     return wire.on("log", (l, c, s) => this.emit("log", l, c, s));
   }
 }

query.ts

@@ -323,22 +323,15 @@ export const sql_types: SqlTypeMap = {
 
 sql.types = sql_types;
 
-type ReadonlyTuple<T extends readonly unknown[]> = readonly [...T];
+export interface Result {
-
-export interface CommandResult {
   readonly tag: string;
 }
 
-export interface Result<T> extends CommandResult, ReadonlyTuple<[T]> {
+export interface Rows<T> extends Result, ReadonlyArray<T> {
-  readonly row: T;
-}
-
-export interface Results<T> extends CommandResult, ReadonlyArray<T> {
   readonly rows: ReadonlyArray<T>;
 }
 
-export interface ResultStream<T>
+export interface RowStream<T> extends AsyncIterable<T[], Result, void> {}
-  extends AsyncIterable<T[], CommandResult, void> {}
 
 export interface Row extends Iterable<unknown, void, void> {
   [column: string]: unknown;
@@ -351,12 +344,10 @@ export interface QueryOptions {
   readonly stdout: WritableStream<Uint8Array> | null;
 }
 
-export class Query<T = Row>
+export class Query<T = Row> implements PromiseLike<Rows<T>>, RowStream<T> {
-  implements PromiseLike<Results<T>>, ResultStream<T>
-{
   readonly #f;
 
-  constructor(f: (options: Partial<QueryOptions>) => ResultStream<T>) {
+  constructor(f: (options: Partial<QueryOptions>) => RowStream<T>) {
     this.#f = f;
   }
 
@@ -431,20 +422,18 @@ export class Query<T = Row>
     return this.#f(options);
   }
 
-  async first(): Promise<Result<T>> {
+  async first(): Promise<T> {
-    const { rows, tag } = await this.collect(1);
+    const rows = await this.collect(1);
-    if (!rows.length) throw new TypeError(`expected one row, got none instead`);
+    if (rows.length !== 0) return rows[0];
-    const row = rows[0];
+    else throw new TypeError(`expected one row, got none instead`);
-    return Object.assign([row] as const, { row: rows[0], tag });
   }
 
-  async first_or<S>(value: S): Promise<Result<T | S>> {
+  async first_or<S>(value: S): Promise<T | S> {
-    const { rows, tag } = await this.collect(1);
+    const rows = await this.collect(1);
-    const row = rows.length ? rows[0] : value;
+    return rows.length !== 0 ? rows[0] : value;
-    return Object.assign([row] as const, { row: rows[0], tag });
   }
 
-  async collect(count = Number.POSITIVE_INFINITY): Promise<Results<T>> {
+  async collect(count = Number.POSITIVE_INFINITY): Promise<Rows<T>> {
     const iter = this[Symbol.asyncIterator]();
     let next;
     const rows = [];
@@ -470,8 +459,8 @@ export class Query<T = Row>
     return n;
   }
 
-  then<S = Results<T>, U = never>(
+  then<S = Rows<T>, U = never>(
-    f?: ((rows: Results<T>) => S | PromiseLike<S>) | null,
+    f?: ((rows: Rows<T>) => S | PromiseLike<S>) | null,
     g?: ((reason?: unknown) => U | PromiseLike<U>) | null
   ) {
     return this.collect().then(f, g);

test.ts

@@ -16,7 +16,7 @@ Deno.test(`integers`, async () => {
   await using pg = await connect();
   await using _tx = await pg.begin();
 
-  const [{ a, b, c }] = await pg.query`
+  const { a, b, c } = await pg.query`
     select
       ${"0x100"}::int2 as a,
       ${777}::int4 as b,
@@ -32,7 +32,7 @@ Deno.test(`integers`, async () => {
   expect(b).toBe(777);
   expect(c).toBe(1234);
 
-  const [{ large }] =
+  const { large } =
     await pg.query`select ${"10000000000000000"}::int8 as large`.first();
 
   expect(large).toBe(10000000000000000n);
@@ -47,7 +47,7 @@ Deno.test(`boolean`, async () => {
   await using pg = await connect();
   await using _tx = await pg.begin();
 
-  const [{ a, b, c }] = await pg.query`
+  const { a, b, c } = await pg.query`
     select
       ${true}::bool as a,
       ${"n"}::bool as b,
@@ -63,7 +63,7 @@ Deno.test(`bytea`, async () => {
   await using pg = await connect();
   await using _tx = await pg.begin();
 
-  const [{ string, array, buffer }] = await pg.query`
+  const { string, array, buffer } = await pg.query`
     select
       ${"hello, world"}::bytea as string,
       ${[1, 2, 3, 4, 5]}::bytea as array,
@@ -93,7 +93,7 @@ Deno.test(`row`, async () => {
     ).tag
   ).toBe(`COPY 1`);
 
-  const [row] = await pg.query`select * from my_table`.first();
+  const row = await pg.query`select * from my_table`.first();
   {
     // columns by name
     const { a, b, c } = row;
@@ -132,7 +132,7 @@ Deno.test(`sql injection`, async () => {
     `INSERT 0 1`
   );
 
-  const [{ name }] = await pg.query<{ name: string }>`
+  const { name } = await pg.query<{ name: string }>`
     select name from users
   `.first();
 

wire.ts

@@ -35,11 +35,11 @@ import {
   type EncoderType,
 } from "./ser.ts";
 import {
-  type CommandResult,
   format,
   is_sql,
   Query,
-  type ResultStream,
+  type Result,
+  type RowStream,
   type Row,
   sql,
   type SqlFragment,
@@ -448,33 +448,34 @@ export interface WireOptions {
   readonly password: string;
   readonly database: string | null;
   readonly runtime_params: Record<string, string>;
+  readonly reconnect_delay: number;
   readonly types: SqlTypeMap;
 }
 
 export type WireEvents = {
   log(level: LogLevel, ctx: object, msg: string): void;
   notice(notice: PostgresError): void;
-  parameter(name: string, value: string, prev: string | null): void;
   notify(channel: string, payload: string, process_id: number): void;
+  parameter(name: string, value: string, prev: string | null): void;
   close(reason?: unknown): void;
 };
 
-export interface Transaction extends CommandResult, AsyncDisposable {
+export interface Transaction extends Result, AsyncDisposable {
   readonly open: boolean;
-  commit(): Promise<CommandResult>;
+  commit(): Promise<Result>;
-  rollback(): Promise<CommandResult>;
+  rollback(): Promise<Result>;
 }
 
 export type ChannelEvents = { notify: NotificationHandler };
 export type NotificationHandler = (payload: string, process_id: number) => void;
 export interface Channel
   extends TypedEmitter<ChannelEvents>,
-    CommandResult,
+    Result,
     AsyncDisposable {
   readonly name: string;
   readonly open: boolean;
-  notify(payload: string): Promise<CommandResult>;
+  notify(payload: string): Promise<Result>;
-  unlisten(): Promise<CommandResult>;
+  unlisten(): Promise<Result>;
 }
 
 export async function wire_connect(options: WireOptions) {
@@ -482,7 +483,10 @@ export async function wire_connect(options: WireOptions) {
   return await wire.connect(), wire;
 }
 
-export class Wire extends TypedEmitter<WireEvents> implements Disposable {
+export class Wire<V extends WireEvents = WireEvents>
+  extends TypedEmitter<V>
+  implements Disposable
+{
   readonly #params;
   readonly #connect;
   readonly #query;
@@ -542,16 +546,15 @@ export class Wire extends TypedEmitter<WireEvents> implements Disposable {
   }
 
   async get(param: string) {
-    return (
+    return await this.query`select current_setting(${param}, true)`
-      await this.query`select current_setting(${param}, true)`
+      .map(([s]) => String(s))
-        .map(([s]) => String(s))
+      .first_or(null);
-        .first_or(null)
-    )[0];
   }
 
   async set(param: string, value: string, local = false) {
-    return await this
+    return await this.query`select set_config(${param}, ${value}, ${local})`
-      .query`select set_config(${param}, ${value}, ${local})`.execute();
+      .map(([s]) => String(s))
+      .first();
   }
 
   close(reason?: unknown) {
@@ -575,7 +578,16 @@ async function socket_connect(hostname: string, port: number) {
 
 function wire_impl(
   wire: Wire,
-  { host, port, user, database, password, runtime_params, types }: WireOptions
+  {
+    host,
+    port,
+    user,
+    database,
+    password,
+    runtime_params,
+    reconnect_delay,
+    types,
+  }: WireOptions
 ) {
   // current runtime parameters as reported by postgres
   const params: Parameters = Object.create(null);
@@ -586,6 +598,7 @@ function wire_impl(
 
   // wire supports re-connection; socket and read/write channels are null when closed
   let connected = false;
+  let should_reconnect = false;
   let socket: Deno.Conn | null = null;
   let read_pop: Receiver<Uint8Array> | null = null;
   let write_push: Sender<Uint8Array> | null = null;
@@ -625,7 +638,7 @@ function wire_impl(
     } catch (e) {
       throw (err = e);
     } finally {
-      if (connected) close(err);
+      onclose(err);
     }
   }
 
@@ -640,6 +653,16 @@ function wire_impl(
         return true;
       }
 
+      case NotificationResponse.type: {
+        const { channel, payload, process_id } = ser_decode(
+          NotificationResponse,
+          msg
+        );
+        wire.emit("notify", channel, payload, process_id);
+        channels.get(channel)?.emit("notify", payload, process_id);
+        return true;
+      }
+
       case ParameterStatus.type: {
         const { name, value } = ser_decode(ParameterStatus, msg);
         const prev = params[name] ?? null;
@@ -651,16 +674,6 @@ function wire_impl(
         wire.emit("parameter", name, value, prev);
         return true;
       }
-
-      case NotificationResponse.type: {
-        const { channel, payload, process_id } = ser_decode(
-          NotificationResponse,
-          msg
-        );
-        wire.emit("notify", channel, payload, process_id);
-        channels.get(channel)?.emit("notify", payload, process_id);
-        return true;
-      }
     }
 
     return false;
@@ -688,7 +701,7 @@ function wire_impl(
     } catch (e) {
       throw (err = e);
     } finally {
-      if (connected) close(err);
+      onclose(err);
     }
   }
 
@@ -701,13 +714,26 @@ function wire_impl(
       read_pop = channel.receiver((push) => read_socket(s, push));
       write_push = channel.sender((pop) => write_socket(s, pop));
       await handle_auth(); // run auth with rw lock
-      connected = true;
+      (connected = true), (should_reconnect = reconnect_delay !== 0);
     } catch (e) {
       throw (close(e), e);
     }
   }
 
+  function reconnect() {
+    connect().catch((err) => {
+      log("warn", err as Error, `reconnect failed`);
+      setTimeout(reconnect, reconnect_delay);
+    });
+  }
+
   function close(reason?: unknown) {
+    (should_reconnect = false), onclose(reason);
+  }
+
+  function onclose(reason?: unknown) {
+    if (!connected) return;
+    else connected = false;
     socket?.close(), (socket = null);
     read_pop?.close(reason), (read_pop = null);
     write_push?.close(reason), (write_push = null);
@@ -715,7 +741,8 @@ function wire_impl(
       delete (params as Record<string, string>)[name];
     st_cache.clear(), (st_ids = 0);
     (tx_status = "I"), (tx_stack.length = 0);
-    connected &&= (wire.emit("close", reason), false);
+    should_reconnect &&= (setTimeout(reconnect, reconnect_delay), false);
+    wire.emit("close", reason);
   }
 
   // https://www.postgresql.org/docs/current/protocol-flow.html#PROTOCOL-FLOW-PIPELINING
@@ -1115,7 +1142,7 @@ function wire_impl(
     query: string,
     stdin: ReadableStream<Uint8Array> | null,
     stdout: WritableStream<Uint8Array> | null
-  ): ResultStream<Row> {
+  ): RowStream<Row> {
     yield* await pipeline(
       () => {
         log("debug", { query }, `executing simple query`);
@@ -1161,7 +1188,7 @@ function wire_impl(
     params: unknown[],
     stdin: ReadableStream<Uint8Array> | null,
     stdout: WritableStream<Uint8Array> | null
-  ): ResultStream<Row> {
+  ): RowStream<Row> {
     const { query, name: statement } = st;
     const { ser_params, Row } = await st.parse();
     const param_values = ser_params(params);
@@ -1210,7 +1237,7 @@ function wire_impl(
     chunk_size: number,
     stdin: ReadableStream<Uint8Array> | null,
     stdout: WritableStream<Uint8Array> | null
-  ): ResultStream<Row> {
+  ): RowStream<Row> {
     const { query, name: statement } = st;
     const { ser_params, Row } = await st.parse();
     const param_values = ser_params(params);
@@ -1298,7 +1325,7 @@ function wire_impl(
       return tx_stack.indexOf(this) !== -1;
     }
 
-    constructor(begin: CommandResult) {
+    constructor(begin: Result) {
       Object.assign(this, begin);
     }
 
@@ -1356,7 +1383,7 @@ function wire_impl(
       return channels.get(this.#name) === this;
     }
 
-    constructor(name: string, listen: CommandResult) {
+    constructor(name: string, listen: Result) {
       super();
       Object.assign(this, listen);
       this.#name = name;
@@ -1390,7 +1417,7 @@ export type PoolEvents = {
   log(level: LogLevel, ctx: object, msg: string): void;
 };
 
-export interface PoolWire extends Wire {
+export interface PoolWire<V extends WireEvents = WireEvents> extends Wire<V> {
   readonly connection_id: number;
   readonly borrowed: boolean;
   release(): void;
@@ -1400,8 +1427,8 @@ export interface PoolTransaction extends Transaction {
   readonly wire: PoolWire;
 }
 
-export class Pool
+export class Pool<V extends PoolEvents = PoolEvents>
-  extends TypedEmitter<PoolEvents>
+  extends TypedEmitter<V>
   implements PromiseLike<PoolWire>, Disposable
 {
   readonly #acquire;