multidb

.env.example

@@ -1,14 +1,40 @@
-# Serwer deweloperski
+# Application
 APP_HOST=0.0.0.0
 APP_PORT=3000
 
-# SQLite
+# Port exposed by Docker Compose
+RUSTPAD_PORT=8200
+
+# Database
+
+# SQLite — default
 DATABASE_URL=sqlite:///data/db/rustpad.db?mode=rwc
+
+# PostgreSQL
+# DATABASE_URL=postgres://rustpad:rustpad@postgres:5432/rustpad
+
+# MySQL
+# DATABASE_URL=mysql://rustpad:rustpad@mysql:3306/rustpad
+
 DATABASE_MAX_CONNECTIONS=8
 
-# Assety i logowanie
+# Static assets
 STATIC_DIR=static
 ASSET_VERSION=0.0.1
+
+# Logging
 RUST_LOG=rustpad=debug,tower_http=info
 
-UPLOAD_MAX_SIZE_MB=20
+# Maximum upload size
+UPLOAD_MAX_SIZE_MB=20
+
+# Optional PostgreSQL container configuration
+POSTGRES_DB=rustpad
+POSTGRES_USER=rustpad
+POSTGRES_PASSWORD=rustpad
+
+# Optional MySQL container configuration
+MYSQL_DATABASE=rustpad
+MYSQL_USER=rustpad
+MYSQL_PASSWORD=rustpad
+MYSQL_ROOT_PASSWORD=rustpad_root

.gitignore

@@ -6,4 +6,6 @@ rustpad.db-wal
 .env.docker
 *.log
 data/db/.db*
-data/files/*
+data/db/*/*
+data/files/*
+*.zip

Cargo.toml

@@ -3,7 +3,7 @@ name = "rustpad"
 version = "0.0.1-dev"
 edition = "2024"
 rust-version = "1.85"
-description = "Collaborative Markdown notepad built with Axum, WebSockets and SQLite"
+description = "Collaborative Markdown notepad built with Axum, WebSockets and SQLite, PostgreSQL and MySQL"
 license = "MIT"
 
 [dependencies]
@@ -17,7 +17,7 @@ rand_core = { version = "0.6", features = ["getrandom"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 slug = "0.1"
-sqlx = { version = "0.8", features = ["runtime-tokio-rustls", "sqlite", "chrono", "migrate"] }
+sqlx = { version = "0.8", features = ["runtime-tokio-rustls", "any", "sqlite", "postgres", "mysql", "chrono", "migrate"] }
 tokio = { version = "1", features = ["macros", "rt-multi-thread", "net", "sync", "signal"] }
 tower-http = { version = "0.6", features = ["fs", "trace"] }
 tracing = "0.1"

Dockerfile

@@ -19,6 +19,7 @@ RUN apt-get update \
 WORKDIR /app
 COPY --from=builder /app/target/release/rustpad /usr/local/bin/rustpad
 COPY --from=builder /app/static ./static
+COPY --from=builder /app/migrations ./migrations
 
 USER rustpad
 ENV APP_HOST=0.0.0.0 \

README.md

@@ -36,3 +36,27 @@ Use the **Page** button in the editor. RustPad creates a permanent public `/s/<t
 ## Limit uploadu
 
 The maximum size of a single file is configured with `UPLOAD_MAX_SIZE_MB` w `.env`, np. `UPLOAD_MAX_SIZE_MB=50`. The default is 20 MB. After changing it, restart the project with `./dev.sh`.
+
+## Wybór bazy danych
+
+RustPad wybiera silnik na podstawie `DATABASE_URL`:
+
+- SQLite: `sqlite:///data/db/rustpad.db?mode=rwc&journal_mode=WAL&busy_timeout=5000`
+- PostgreSQL: `postgres://rustpad:rustpad@postgres:5432/rustpad`
+- MySQL: `mysql://rustpad:rustpad@mysql:3306/rustpad`
+
+SQLite pozostaje domyślną bazą dla developmentu i małych instalacji. Tryb WAL pozwala czytać podczas zapisu, ale SQLite nadal wykonuje tylko jeden zapis naraz. `busy_timeout=5000` powoduje krótkie oczekiwanie zamiast natychmiastowego błędu `database is locked`. Przy wielu równoczesnych edytorach lub wielu instancjach aplikacji zalecany jest PostgreSQL albo MySQL.
+
+Opcjonalne bazy w Docker Compose:
+
+```bash
+# PostgreSQL
+docker compose --profile postgres up -d postgres
+DATABASE_URL=postgres://rustpad:rustpad@postgres:5432/rustpad docker compose up -d rustpad
+
+# MySQL
+docker compose --profile mysql up -d mysql
+DATABASE_URL=mysql://rustpad:rustpad@mysql:3306/rustpad docker compose up -d rustpad
+```
+
+Migracje są rozdzielone w `migrations/sqlite`, `migrations/postgres` i `migrations/mysql`. Zapytania aplikacji znajdują się centralnie w `src/queries.rs`, a `src/database.rs` odpowiada za wybór sterownika i konfigurację połączenia.

docker-compose.yml

@@ -8,7 +8,7 @@ services:
     environment:
       APP_HOST: ${APP_HOST:-0.0.0.0}
       APP_PORT: ${APP_PORT:-3000}
-      DATABASE_URL: ${DATABASE_URL:-sqlite:///data/db/rustpad.db?mode=rwc}
+      DATABASE_URL: ${DATABASE_URL:-sqlite:///data/db/rustpad.db?mode=rwc&journal_mode=WAL&busy_timeout=5000}
       DATABASE_MAX_CONNECTIONS: ${DATABASE_MAX_CONNECTIONS:-8}
       STATIC_DIR: ${STATIC_DIR:-/app/static}
       FILES_DIR: ${FILES_DIR:-/data/files}
@@ -18,4 +18,38 @@ services:
     ports:
       - "${RUSTPAD_PORT:-3000}:${APP_PORT:-3000}"
     volumes:
-      - ./data:/data
+      - ./data:/data
+
+  postgres:
+    image: postgres:18
+    profiles: ["pgsql"]
+    environment:
+      POSTGRES_DB: ${POSTGRES_DB:-rustpad}
+      POSTGRES_USER: ${POSTGRES_USER:-rustpad}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-rustpad}
+    volumes:
+      - ./data/db/pgsql:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-rustpad} -d ${POSTGRES_DB:-rustpad}"]
+      interval: 5s
+      timeout: 3s
+      retries: 20
+
+  mysql:
+    image: mysql:8.4
+    profiles: ["mysql"]
+    environment:
+      MYSQL_DATABASE: ${MYSQL_DATABASE:-rustpad}
+      MYSQL_USER: ${MYSQL_USER:-rustpad}
+      MYSQL_PASSWORD: ${MYSQL_PASSWORD:-rustpad}
+      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD:-root}
+    command: ["--character-set-server=utf8mb4", "--collation-server=utf8mb4_unicode_ci"]
+    volumes:
+      - ./data/db/mysql:/var/lib/mysql
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-u", "root", "-p${MYSQL_ROOT_PASSWORD:-root}"]
+      interval: 5s
+      timeout: 3s
+      retries: 30
+
+

migrations/0002_workspaces.sql

@@ -1,43 +0,0 @@
-PRAGMA foreign_keys = ON;
-
-CREATE TABLE IF NOT EXISTS workspaces (
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    slug TEXT NOT NULL UNIQUE,
-    title TEXT NOT NULL,
-    password_hash TEXT,
-    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
-);
-
-CREATE TABLE IF NOT EXISTS notes (
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    workspace_id INTEGER NOT NULL,
-    slug TEXT NOT NULL,
-    title TEXT NOT NULL,
-    content TEXT NOT NULL DEFAULT '',
-    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    FOREIGN KEY (workspace_id) REFERENCES workspaces(id) ON DELETE CASCADE,
-    UNIQUE(workspace_id, slug)
-);
-
-CREATE TABLE IF NOT EXISTS note_revisions (
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    note_id INTEGER NOT NULL,
-    content TEXT NOT NULL,
-    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    FOREIGN KEY (note_id) REFERENCES notes(id) ON DELETE CASCADE
-);
-
-CREATE INDEX IF NOT EXISTS idx_notes_workspace ON notes(workspace_id, updated_at DESC);
-CREATE INDEX IF NOT EXISTS idx_note_revisions_note ON note_revisions(note_id, id DESC);
-
--- Preserve data from version 0.4.x: the old note becomes a workspace with one note.
-INSERT OR IGNORE INTO workspaces (id, slug, title, password_hash, created_at, updated_at)
-SELECT id, slug, title, password_hash, created_at, updated_at FROM pads;
-
-INSERT OR IGNORE INTO notes (id, workspace_id, slug, title, content, created_at, updated_at)
-SELECT id, id, 'notatka', title, content, created_at, updated_at FROM pads;
-
-INSERT OR IGNORE INTO note_revisions (id, note_id, content, created_at)
-SELECT id, pad_id, content, created_at FROM revisions;

migrations/0003_authors.sql

@@ -1,4 +0,0 @@
-ALTER TABLE notes ADD COLUMN owner_map TEXT NOT NULL DEFAULT '[]';
-ALTER TABLE note_revisions ADD COLUMN author TEXT;
-ALTER TABLE note_revisions ADD COLUMN owner_map TEXT NOT NULL DEFAULT '[]';
-ALTER TABLE revisions ADD COLUMN author TEXT;

migrations/0004_pad_owners.sql

@@ -1,2 +0,0 @@
-ALTER TABLE pads ADD COLUMN owner_map TEXT NOT NULL DEFAULT '[]';
-ALTER TABLE revisions ADD COLUMN owner_map TEXT NOT NULL DEFAULT '[]';

migrations/0005_published_pages.sql

@@ -1,8 +0,0 @@
-CREATE TABLE published_pages (
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    token TEXT NOT NULL UNIQUE,
-    pad_id INTEGER UNIQUE REFERENCES pads(id) ON DELETE CASCADE,
-    note_id INTEGER UNIQUE REFERENCES notes(id) ON DELETE CASCADE,
-    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    CHECK ((pad_id IS NOT NULL AND note_id IS NULL) OR (pad_id IS NULL AND note_id IS NOT NULL))
-);

migrations/0006_file_tokens.sql

@@ -1,5 +0,0 @@
-ALTER TABLE pads ADD COLUMN file_token TEXT;
-ALTER TABLE notes ADD COLUMN file_token TEXT;
-
-CREATE UNIQUE INDEX IF NOT EXISTS idx_pads_file_token ON pads(file_token) WHERE file_token IS NOT NULL;
-CREATE UNIQUE INDEX IF NOT EXISTS idx_notes_file_token ON notes(file_token) WHERE file_token IS NOT NULL;

migrations/mysql/0001_init.sql

@@ -0,0 +1,26 @@
+CREATE TABLE pads (
+ id BIGINT AUTO_INCREMENT PRIMARY KEY, slug VARCHAR(255) NOT NULL UNIQUE, title TEXT NOT NULL, content LONGTEXT NOT NULL DEFAULT (''), password_hash TEXT,
+ created_at VARCHAR(64) NOT NULL DEFAULT (CURRENT_TIMESTAMP), updated_at VARCHAR(64) NOT NULL DEFAULT (CURRENT_TIMESTAMP), owner_map LONGTEXT NOT NULL DEFAULT ('[]'), file_token VARCHAR(255) UNIQUE
+) ENGINE=InnoDB;
+CREATE TABLE revisions (
+ id BIGINT AUTO_INCREMENT PRIMARY KEY, pad_id BIGINT NOT NULL, content LONGTEXT NOT NULL, created_at VARCHAR(64) NOT NULL DEFAULT (CURRENT_TIMESTAMP), author TEXT, owner_map LONGTEXT NOT NULL DEFAULT ('[]'),
+ CONSTRAINT fk_revisions_pad FOREIGN KEY (pad_id) REFERENCES pads(id) ON DELETE CASCADE, INDEX idx_revisions_pad_id (pad_id, id DESC)
+) ENGINE=InnoDB;
+CREATE TABLE workspaces (
+ id BIGINT AUTO_INCREMENT PRIMARY KEY, slug VARCHAR(255) NOT NULL UNIQUE, title TEXT NOT NULL, password_hash TEXT,
+ created_at VARCHAR(64) NOT NULL DEFAULT (CURRENT_TIMESTAMP), updated_at VARCHAR(64) NOT NULL DEFAULT (CURRENT_TIMESTAMP)
+) ENGINE=InnoDB;
+CREATE TABLE notes (
+ id BIGINT AUTO_INCREMENT PRIMARY KEY, workspace_id BIGINT NOT NULL, slug VARCHAR(255) NOT NULL, title TEXT NOT NULL, content LONGTEXT NOT NULL DEFAULT (''),
+ created_at VARCHAR(64) NOT NULL DEFAULT (CURRENT_TIMESTAMP), updated_at VARCHAR(64) NOT NULL DEFAULT (CURRENT_TIMESTAMP), owner_map LONGTEXT NOT NULL DEFAULT ('[]'), file_token VARCHAR(255) UNIQUE,
+ CONSTRAINT fk_notes_workspace FOREIGN KEY (workspace_id) REFERENCES workspaces(id) ON DELETE CASCADE, UNIQUE KEY uq_notes_workspace_slug (workspace_id, slug), INDEX idx_notes_workspace (workspace_id, updated_at DESC)
+) ENGINE=InnoDB;
+CREATE TABLE note_revisions (
+ id BIGINT AUTO_INCREMENT PRIMARY KEY, note_id BIGINT NOT NULL, content LONGTEXT NOT NULL, created_at VARCHAR(64) NOT NULL DEFAULT (CURRENT_TIMESTAMP), author TEXT, owner_map LONGTEXT NOT NULL DEFAULT ('[]'),
+ CONSTRAINT fk_note_revisions_note FOREIGN KEY (note_id) REFERENCES notes(id) ON DELETE CASCADE, INDEX idx_note_revisions_note (note_id, id DESC)
+) ENGINE=InnoDB;
+CREATE TABLE published_pages (
+ id BIGINT AUTO_INCREMENT PRIMARY KEY, token VARCHAR(255) NOT NULL UNIQUE, pad_id BIGINT UNIQUE, note_id BIGINT UNIQUE, created_at VARCHAR(64) NOT NULL DEFAULT (CURRENT_TIMESTAMP),
+ CONSTRAINT fk_published_pad FOREIGN KEY (pad_id) REFERENCES pads(id) ON DELETE CASCADE, CONSTRAINT fk_published_note FOREIGN KEY (note_id) REFERENCES notes(id) ON DELETE CASCADE,
+ CHECK ((pad_id IS NOT NULL AND note_id IS NULL) OR (pad_id IS NULL AND note_id IS NOT NULL))
+) ENGINE=InnoDB;

migrations/postgres/0001_init.sql

@@ -0,0 +1,29 @@
+CREATE TABLE pads (
+ id BIGSERIAL PRIMARY KEY, slug TEXT NOT NULL UNIQUE, title TEXT NOT NULL, content TEXT NOT NULL DEFAULT '', password_hash TEXT,
+ created_at TEXT NOT NULL DEFAULT (CURRENT_TIMESTAMP::text), updated_at TEXT NOT NULL DEFAULT (CURRENT_TIMESTAMP::text), owner_map TEXT NOT NULL DEFAULT '[]', file_token TEXT UNIQUE
+);
+CREATE TABLE revisions (
+ id BIGSERIAL PRIMARY KEY, pad_id BIGINT NOT NULL REFERENCES pads(id) ON DELETE CASCADE, content TEXT NOT NULL,
+ created_at TEXT NOT NULL DEFAULT (CURRENT_TIMESTAMP::text), author TEXT, owner_map TEXT NOT NULL DEFAULT '[]'
+);
+CREATE INDEX idx_revisions_pad_id ON revisions(pad_id, id DESC);
+CREATE TABLE workspaces (
+ id BIGSERIAL PRIMARY KEY, slug TEXT NOT NULL UNIQUE, title TEXT NOT NULL, password_hash TEXT,
+ created_at TEXT NOT NULL DEFAULT (CURRENT_TIMESTAMP::text), updated_at TEXT NOT NULL DEFAULT (CURRENT_TIMESTAMP::text)
+);
+CREATE TABLE notes (
+ id BIGSERIAL PRIMARY KEY, workspace_id BIGINT NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE, slug TEXT NOT NULL, title TEXT NOT NULL,
+ content TEXT NOT NULL DEFAULT '', created_at TEXT NOT NULL DEFAULT (CURRENT_TIMESTAMP::text), updated_at TEXT NOT NULL DEFAULT (CURRENT_TIMESTAMP::text),
+ owner_map TEXT NOT NULL DEFAULT '[]', file_token TEXT UNIQUE, UNIQUE(workspace_id, slug)
+);
+CREATE INDEX idx_notes_workspace ON notes(workspace_id, updated_at DESC);
+CREATE TABLE note_revisions (
+ id BIGSERIAL PRIMARY KEY, note_id BIGINT NOT NULL REFERENCES notes(id) ON DELETE CASCADE, content TEXT NOT NULL,
+ created_at TEXT NOT NULL DEFAULT (CURRENT_TIMESTAMP::text), author TEXT, owner_map TEXT NOT NULL DEFAULT '[]'
+);
+CREATE INDEX idx_note_revisions_note ON note_revisions(note_id, id DESC);
+CREATE TABLE published_pages (
+ id BIGSERIAL PRIMARY KEY, token TEXT NOT NULL UNIQUE, pad_id BIGINT UNIQUE REFERENCES pads(id) ON DELETE CASCADE,
+ note_id BIGINT UNIQUE REFERENCES notes(id) ON DELETE CASCADE, created_at TEXT NOT NULL DEFAULT (CURRENT_TIMESTAMP::text),
+ CHECK ((pad_id IS NOT NULL AND note_id IS NULL) OR (pad_id IS NULL AND note_id IS NOT NULL))
+);

src/database.rs

@@ -0,0 +1,43 @@
+use sqlx::{any::AnyPoolOptions, AnyPool};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum DatabaseKind {
+    Sqlite,
+    Postgres,
+    MySql,
+}
+
+#[derive(Debug, Clone)]
+pub struct Database {
+    pool: AnyPool,
+    kind: DatabaseKind,
+}
+
+impl Database {
+    pub async fn connect(url: &str, max_connections: u32) -> Result<Self, sqlx::Error> {
+        sqlx::any::install_default_drivers();
+        let kind = DatabaseKind::from_url(url)?;
+        let pool = AnyPoolOptions::new()
+            .max_connections(max_connections)
+            .connect(url)
+            .await?;
+        if kind == DatabaseKind::Sqlite {
+            sqlx::query("PRAGMA foreign_keys = ON").execute(&pool).await?;
+            sqlx::query("PRAGMA journal_mode = WAL").execute(&pool).await?;
+            sqlx::query("PRAGMA busy_timeout = 5000").execute(&pool).await?;
+        }
+        Ok(Self { pool, kind })
+    }
+
+    pub fn pool(&self) -> &AnyPool { &self.pool }
+    pub fn kind(&self) -> DatabaseKind { self.kind }
+}
+
+impl DatabaseKind {
+    fn from_url(url: &str) -> Result<Self, sqlx::Error> {
+        if url.starts_with("sqlite:") { Ok(Self::Sqlite) }
+        else if url.starts_with("postgres:") || url.starts_with("postgresql:") { Ok(Self::Postgres) }
+        else if url.starts_with("mysql:") { Ok(Self::MySql) }
+        else { Err(sqlx::Error::Configuration("DATABASE_URL must use sqlite://, postgres:// or mysql://".into())) }
+    }
+}

src/db.rs

@@ -4,7 +4,23 @@ use argon2::{
 use chrono::{DateTime, Utc};
 use rand_core::{OsRng, RngCore};
 use serde::Serialize;
-use sqlx::{FromRow, SqlitePool};
+use sqlx::FromRow;
+use crate::{database::{Database, DatabaseKind}, queries};
+use sqlx::{Any, Transaction};
+
+
+async fn inserted_id(kind: DatabaseKind, tx: &mut Transaction<'_, Any>, table: &str) -> Result<i64, sqlx::Error> {
+    let query = match kind {
+        DatabaseKind::Sqlite => "SELECT last_insert_rowid()",
+        DatabaseKind::MySql => "SELECT LAST_INSERT_ID()",
+        DatabaseKind::Postgres => match table {
+            "note_revisions" => "SELECT currval(pg_get_serial_sequence('note_revisions', 'id'))",
+            "revisions" => "SELECT currval(pg_get_serial_sequence('revisions', 'id'))",
+            _ => unreachable!("unsupported identity table"),
+        },
+    };
+    sqlx::query_scalar(query).fetch_one(&mut **tx).await
+}
 
 #[derive(Debug, Clone, FromRow)]
 pub struct Workspace {
@@ -39,36 +55,30 @@ pub struct Revision {
     pub owner_map: String,
 }
 
-pub async fn find_workspace(pool: &SqlitePool, slug: &str) -> Result<Option<Workspace>, sqlx::Error> {
+pub async fn find_workspace(pool: &Database, slug: &str) -> Result<Option<Workspace>, sqlx::Error> {
-    sqlx::query_as::<_, Workspace>(
+    sqlx::query_as::<_, Workspace>(queries::get(pool.kind(), queries::Q001))
-        "SELECT id, slug, title, password_hash, created_at, updated_at FROM workspaces WHERE slug = ?",
-    )
     .bind(slug)
-    .fetch_optional(pool)
+    .fetch_optional(pool.pool())
     .await
 }
 
 pub async fn create_workspace(
-    pool: &SqlitePool,
+    pool: &Database,
     slug: &str,
     title: &str,
     password: Option<&str>,
 ) -> Result<Workspace, sqlx::Error> {
     let password_hash = password.filter(|value| !value.is_empty()).map(hash_password);
-    let result = sqlx::query(
+    sqlx::query(queries::get(pool.kind(), queries::Q002))
-        "INSERT INTO workspaces (slug, title, password_hash) VALUES (?, ?, ?)",
-    )
     .bind(slug)
     .bind(title)
     .bind(password_hash)
-    .execute(pool)
+    .execute(pool.pool())
     .await?;
 
-    sqlx::query_as::<_, Workspace>(
+    sqlx::query_as::<_, Workspace>(queries::get(pool.kind(), queries::Q001))
-        "SELECT id, slug, title, password_hash, created_at, updated_at FROM workspaces WHERE id = ?",
+    .bind(slug)
-    )
+    .fetch_one(pool.pool())
-    .bind(result.last_insert_rowid())
-    .fetch_one(pool)
     .await
 }
 
@@ -87,92 +97,84 @@ pub fn verify_workspace_password(workspace: &Workspace, password: Option<&str>)
     }
 }
 
-pub async fn list_notes(pool: &SqlitePool, workspace_id: i64) -> Result<Vec<Note>, sqlx::Error> {
+pub async fn list_notes(pool: &Database, workspace_id: i64) -> Result<Vec<Note>, sqlx::Error> {
-    sqlx::query_as::<_, Note>(
+    sqlx::query_as::<_, Note>(queries::get(pool.kind(), queries::Q003))
-        "SELECT id, workspace_id, slug, title, content, created_at, updated_at, owner_map FROM notes WHERE workspace_id = ? ORDER BY updated_at DESC, id DESC",
-    )
     .bind(workspace_id)
-    .fetch_all(pool)
+    .fetch_all(pool.pool())
     .await
 }
 
 pub async fn find_note(
-    pool: &SqlitePool,
+    pool: &Database,
     workspace_id: i64,
     slug: &str,
 ) -> Result<Option<Note>, sqlx::Error> {
-    sqlx::query_as::<_, Note>(
+    sqlx::query_as::<_, Note>(queries::get(pool.kind(), queries::Q004))
-        "SELECT id, workspace_id, slug, title, content, created_at, updated_at, owner_map FROM notes WHERE workspace_id = ? AND slug = ?",
-    )
     .bind(workspace_id)
     .bind(slug)
-    .fetch_optional(pool)
+    .fetch_optional(pool.pool())
     .await
 }
 
 pub async fn create_note(
-    pool: &SqlitePool,
+    pool: &Database,
     workspace_id: i64,
     slug: &str,
     title: &str,
 ) -> Result<Note, sqlx::Error> {
-    let result = sqlx::query(
+    sqlx::query(queries::get(pool.kind(), queries::Q005))
-        "INSERT INTO notes (workspace_id, slug, title) VALUES (?, ?, ?)",
-    )
     .bind(workspace_id)
     .bind(slug)
     .bind(title)
-    .execute(pool)
+    .execute(pool.pool())
     .await?;
 
-    sqlx::query_as::<_, Note>(
+    sqlx::query_as::<_, Note>(queries::get(pool.kind(), queries::Q004))
-        "SELECT id, workspace_id, slug, title, content, created_at, updated_at, owner_map FROM notes WHERE id = ?",
+    .bind(workspace_id)
-    )
+    .bind(slug)
-    .bind(result.last_insert_rowid())
+    .fetch_one(pool.pool())
-    .fetch_one(pool)
     .await
 }
 
 pub async fn save_revision(
-    pool: &SqlitePool,
+    pool: &Database,
     note_id: i64,
     workspace_id: i64,
     content: &str,
     author: Option<&str>,
     owner_map: &str,
 ) -> Result<(i64, String), sqlx::Error> {
-    let mut tx = pool.begin().await?;
+    let mut tx = pool.pool().begin().await?;
-    sqlx::query("UPDATE notes SET content = ?, owner_map = ?, updated_at = CURRENT_TIMESTAMP WHERE id = ?")
+    sqlx::query(queries::get(pool.kind(), queries::Q006))
         .bind(content)
         .bind(owner_map)
         .bind(note_id)
         .execute(&mut *tx)
         .await?;
-    sqlx::query("UPDATE workspaces SET updated_at = CURRENT_TIMESTAMP WHERE id = ?")
+    sqlx::query(queries::get(pool.kind(), queries::Q007))
         .bind(workspace_id)
         .execute(&mut *tx)
         .await?;
-    let result = sqlx::query("INSERT INTO note_revisions (note_id, content, author, owner_map) VALUES (?, ?, ?, ?)")
+    sqlx::query(queries::get(pool.kind(), queries::Q008))
         .bind(note_id)
         .bind(content)
         .bind(author)
         .bind(owner_map)
         .execute(&mut *tx)
         .await?;
-    let updated_at: String = sqlx::query_scalar("SELECT updated_at FROM notes WHERE id = ?")
+    let revision_id = inserted_id(pool.kind(), &mut tx, "note_revisions").await?;
+    let updated_at: String = sqlx::query_scalar(queries::get(pool.kind(), queries::Q009))
         .bind(note_id)
         .fetch_one(&mut *tx)
         .await?;
     tx.commit().await?;
-    Ok((result.last_insert_rowid(), updated_at))
+    Ok((revision_id, updated_at))
 }
 
-pub async fn list_revisions(pool: &SqlitePool, note_id: i64) -> Result<Vec<Revision>, sqlx::Error> {
+pub async fn list_revisions(pool: &Database, note_id: i64) -> Result<Vec<Revision>, sqlx::Error> {
-    sqlx::query_as::<_, Revision>(
+    sqlx::query_as::<_, Revision>(queries::get(pool.kind(), queries::Q010))
-        "SELECT id, content, created_at, author, owner_map FROM note_revisions WHERE note_id = ? ORDER BY id DESC LIMIT 100",
-    )
     .bind(note_id)
-    .fetch_all(pool)
+    .fetch_all(pool.pool())
     .await
 }
 
@@ -213,36 +215,30 @@ pub struct Pad {
     pub owner_map: String,
 }
 
-pub async fn find_pad(pool: &SqlitePool, slug: &str) -> Result<Option<Pad>, sqlx::Error> {
+pub async fn find_pad(pool: &Database, slug: &str) -> Result<Option<Pad>, sqlx::Error> {
-    sqlx::query_as::<_, Pad>(
+    sqlx::query_as::<_, Pad>(queries::get(pool.kind(), queries::Q011))
-        "SELECT id, slug, title, content, password_hash, created_at, updated_at, owner_map FROM pads WHERE slug = ?",
-    )
     .bind(slug)
-    .fetch_optional(pool)
+    .fetch_optional(pool.pool())
     .await
 }
 
 pub async fn create_pad(
-    pool: &SqlitePool,
+    pool: &Database,
     slug: &str,
     title: &str,
     password: Option<&str>,
 ) -> Result<Pad, sqlx::Error> {
     let password_hash = password.filter(|value| !value.is_empty()).map(hash_password);
-    let result = sqlx::query(
+    sqlx::query(queries::get(pool.kind(), queries::Q012))
-        "INSERT INTO pads (slug, title, password_hash) VALUES (?, ?, ?)",
-    )
     .bind(slug)
     .bind(title)
     .bind(password_hash)
-    .execute(pool)
+    .execute(pool.pool())
     .await?;
 
-    sqlx::query_as::<_, Pad>(
+    sqlx::query_as::<_, Pad>(queries::get(pool.kind(), queries::Q011))
-        "SELECT id, slug, title, content, password_hash, created_at, updated_at, owner_map FROM pads WHERE id = ?",
+    .bind(slug)
-    )
+    .fetch_one(pool.pool())
-    .bind(result.last_insert_rowid())
-    .fetch_one(pool)
     .await
 }
 
@@ -262,43 +258,42 @@ pub fn verify_pad_password(pad: &Pad, password: Option<&str>) -> bool {
 }
 
 pub async fn save_pad_revision(
-    pool: &SqlitePool,
+    pool: &Database,
     pad_id: i64,
     content: &str,
     author: Option<&str>,
     owner_map: &str,
 ) -> Result<(i64, String), sqlx::Error> {
-    let mut tx = pool.begin().await?;
+    let mut tx = pool.pool().begin().await?;
-    sqlx::query("UPDATE pads SET content = ?, owner_map = ?, updated_at = CURRENT_TIMESTAMP WHERE id = ?")
+    sqlx::query(queries::get(pool.kind(), queries::Q013))
         .bind(content)
         .bind(owner_map)
         .bind(pad_id)
         .execute(&mut *tx)
         .await?;
-    let result = sqlx::query("INSERT INTO revisions (pad_id, content, author, owner_map) VALUES (?, ?, ?, ?)")
+    sqlx::query(queries::get(pool.kind(), queries::Q014))
         .bind(pad_id)
         .bind(content)
         .bind(author)
         .bind(owner_map)
         .execute(&mut *tx)
         .await?;
-    let updated_at: String = sqlx::query_scalar("SELECT updated_at FROM pads WHERE id = ?")
+    let revision_id = inserted_id(pool.kind(), &mut tx, "revisions").await?;
+    let updated_at: String = sqlx::query_scalar(queries::get(pool.kind(), queries::Q015))
         .bind(pad_id)
         .fetch_one(&mut *tx)
         .await?;
     tx.commit().await?;
-    Ok((result.last_insert_rowid(), updated_at))
+    Ok((revision_id, updated_at))
 }
 
 pub async fn list_pad_revisions(
-    pool: &SqlitePool,
+    pool: &Database,
     pad_id: i64,
 ) -> Result<Vec<Revision>, sqlx::Error> {
-    sqlx::query_as::<_, Revision>(
+    sqlx::query_as::<_, Revision>(queries::get(pool.kind(), queries::Q016))
-        "SELECT id, content, created_at, author, owner_map FROM revisions WHERE pad_id = ? ORDER BY id DESC LIMIT 100",
-    )
     .bind(pad_id)
-    .fetch_all(pool)
+    .fetch_all(pool.pool())
     .await
 }
 
@@ -310,90 +305,88 @@ pub struct PublishedPage {
     pub updated_at: String,
 }
 
-pub async fn publish_pad(pool: &SqlitePool, pad_id: i64) -> Result<String, sqlx::Error> {
+pub async fn publish_pad(pool: &Database, pad_id: i64) -> Result<String, sqlx::Error> {
-    if let Some(token) = sqlx::query_scalar::<_, String>("SELECT token FROM published_pages WHERE pad_id = ?")
+    if let Some(token) = sqlx::query_scalar::<_, String>(queries::get(pool.kind(), queries::Q017))
         .bind(pad_id)
-        .fetch_optional(pool)
+        .fetch_optional(pool.pool())
         .await?
     {
         return Ok(token);
     }
     let token = random_suffix(18);
-    sqlx::query("INSERT INTO published_pages (token, pad_id) VALUES (?, ?)")
+    sqlx::query(queries::get(pool.kind(), queries::Q018))
         .bind(&token)
         .bind(pad_id)
-        .execute(pool)
+        .execute(pool.pool())
         .await?;
     Ok(token)
 }
 
-pub async fn publish_note(pool: &SqlitePool, note_id: i64) -> Result<String, sqlx::Error> {
+pub async fn publish_note(pool: &Database, note_id: i64) -> Result<String, sqlx::Error> {
-    if let Some(token) = sqlx::query_scalar::<_, String>("SELECT token FROM published_pages WHERE note_id = ?")
+    if let Some(token) = sqlx::query_scalar::<_, String>(queries::get(pool.kind(), queries::Q019))
         .bind(note_id)
-        .fetch_optional(pool)
+        .fetch_optional(pool.pool())
         .await?
     {
         return Ok(token);
     }
     let token = random_suffix(18);
-    sqlx::query("INSERT INTO published_pages (token, note_id) VALUES (?, ?)")
+    sqlx::query(queries::get(pool.kind(), queries::Q020))
         .bind(&token)
         .bind(note_id)
-        .execute(pool)
+        .execute(pool.pool())
         .await?;
     Ok(token)
 }
 
-pub async fn find_published_page(pool: &SqlitePool, token: &str) -> Result<Option<PublishedPage>, sqlx::Error> {
+pub async fn find_published_page(pool: &Database, token: &str) -> Result<Option<PublishedPage>, sqlx::Error> {
-    sqlx::query_as::<_, PublishedPage>(
+    sqlx::query_as::<_, PublishedPage>(queries::get(pool.kind(), queries::Q021))
-        "SELECT pp.token, COALESCE(p.title, n.title) AS title, COALESCE(p.content, n.content) AS content, COALESCE(p.updated_at, n.updated_at) AS updated_at FROM published_pages pp LEFT JOIN pads p ON p.id = pp.pad_id LEFT JOIN notes n ON n.id = pp.note_id WHERE pp.token = ?",
-    )
     .bind(token)
-    .fetch_optional(pool)
+    .fetch_optional(pool.pool())
     .await
 }
 
-pub async fn pad_file_token(pool: &SqlitePool, pad_id: i64) -> Result<String, sqlx::Error> {
+pub async fn pad_file_token(pool: &Database, pad_id: i64) -> Result<String, sqlx::Error> {
-    if let Some(token) = sqlx::query_scalar::<_, Option<String>>("SELECT file_token FROM pads WHERE id = ?")
+    if let Some(token) = sqlx::query_scalar::<_, Option<String>>(queries::get(pool.kind(), queries::Q022))
         .bind(pad_id)
-        .fetch_one(pool)
+        .fetch_one(pool.pool())
         .await?
     {
         return Ok(token);
     }
 
     let token = format!("p_{}", random_suffix(24));
-    sqlx::query("UPDATE pads SET file_token = ? WHERE id = ? AND file_token IS NULL")
+    sqlx::query(queries::get(pool.kind(), queries::Q023))
         .bind(&token)
         .bind(pad_id)
-        .execute(pool)
+        .execute(pool.pool())
         .await?;
 
-    sqlx::query_scalar::<_, String>("SELECT file_token FROM pads WHERE id = ?")
+    sqlx::query_scalar::<_, String>(queries::get(pool.kind(), queries::Q022))
         .bind(pad_id)
-        .fetch_one(pool)
+        .fetch_one(pool.pool())
         .await
 }
 
-pub async fn note_file_token(pool: &SqlitePool, note_id: i64) -> Result<String, sqlx::Error> {
+pub async fn note_file_token(pool: &Database, note_id: i64) -> Result<String, sqlx::Error> {
-    if let Some(token) = sqlx::query_scalar::<_, Option<String>>("SELECT file_token FROM notes WHERE id = ?")
+    if let Some(token) = sqlx::query_scalar::<_, Option<String>>(queries::get(pool.kind(), queries::Q024))
         .bind(note_id)
-        .fetch_one(pool)
+        .fetch_one(pool.pool())
         .await?
     {
         return Ok(token);
     }
 
     let token = format!("n_{}", random_suffix(24));
-    sqlx::query("UPDATE notes SET file_token = ? WHERE id = ? AND file_token IS NULL")
+    sqlx::query(queries::get(pool.kind(), queries::Q025))
         .bind(&token)
         .bind(note_id)
-        .execute(pool)
+        .execute(pool.pool())
         .await?;
 
-    sqlx::query_scalar::<_, String>("SELECT file_token FROM notes WHERE id = ?")
+    sqlx::query_scalar::<_, String>(queries::get(pool.kind(), queries::Q024))
         .bind(note_id)
-        .fetch_one(pool)
+        .fetch_one(pool.pool())
         .await
 }
 
@@ -410,17 +403,17 @@ pub struct FileOwner {
     pub id: i64,
 }
 
-pub async fn find_file_owner(pool: &SqlitePool, token: &str) -> Result<Option<FileOwner>, sqlx::Error> {
+pub async fn find_file_owner(pool: &Database, token: &str) -> Result<Option<FileOwner>, sqlx::Error> {
-    if let Some(id) = sqlx::query_scalar::<_, i64>("SELECT id FROM pads WHERE file_token = ?")
+    if let Some(id) = sqlx::query_scalar::<_, i64>(queries::get(pool.kind(), queries::Q026))
         .bind(token)
-        .fetch_optional(pool)
+        .fetch_optional(pool.pool())
         .await?
     {
         return Ok(Some(FileOwner { kind: FileOwnerKind::Pad, id }));
     }
-    if let Some(id) = sqlx::query_scalar::<_, i64>("SELECT id FROM notes WHERE file_token = ?")
+    if let Some(id) = sqlx::query_scalar::<_, i64>(queries::get(pool.kind(), queries::Q027))
         .bind(token)
-        .fetch_optional(pool)
+        .fetch_optional(pool.pool())
         .await?
     {
         return Ok(Some(FileOwner { kind: FileOwnerKind::Note, id }));

src/main.rs

@@ -1,14 +1,16 @@
 mod api;
 mod app;
 mod config;
+mod database;
 mod db;
+mod queries;
 mod state;
 mod websocket;
 
 use std::{net::SocketAddr, sync::Arc};
 
 use config::Config;
-use sqlx::sqlite::SqlitePoolOptions;
+use database::{Database, DatabaseKind};
 use state::AppState;
 use tokio::net::TcpListener;
 use tracing::info;
@@ -23,11 +25,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     if let Some(path) = config.database_url.strip_prefix("sqlite://").and_then(|v| v.split('?').next()) {
         if let Some(parent) = std::path::Path::new(path).parent() { std::fs::create_dir_all(parent)?; }
     }
-    let db = SqlitePoolOptions::new()
+    let db = Database::connect(&config.database_url, config.database_max_connections).await?;
-        .max_connections(config.database_max_connections)
+    run_migrations(&db).await?;
-        .connect(&config.database_url)
-        .await?;
-    sqlx::migrate!().run(&db).await?;
 
     std::fs::create_dir_all(&config.files_dir)?;
     let state = Arc::new(AppState::new(
@@ -78,3 +77,12 @@ async fn shutdown_signal() {
     let terminate = std::future::pending::<()>();
     tokio::select! { () = ctrl_c => {}, () = terminate => {} }
 }
+
+async fn run_migrations(db: &Database) -> Result<(), sqlx::migrate::MigrateError> {
+    let path = match db.kind() {
+        DatabaseKind::Sqlite => std::path::Path::new("migrations/sqlite"),
+        DatabaseKind::Postgres => std::path::Path::new("migrations/postgres"),
+        DatabaseKind::MySql => std::path::Path::new("migrations/mysql"),
+    };
+    sqlx::migrate::Migrator::new(path).await?.run(db.pool()).await
+}

src/queries.rs

@@ -0,0 +1,55 @@
+use std::{collections::HashMap, sync::{Mutex, OnceLock}};
+use crate::database::DatabaseKind;
+
+pub const Q001: &str = "SELECT id, slug, title, password_hash, created_at, updated_at FROM workspaces WHERE slug = ?";
+pub const Q002: &str = "INSERT INTO workspaces (slug, title, password_hash) VALUES (?, ?, ?)";
+pub const Q003: &str = "SELECT id, workspace_id, slug, title, content, created_at, updated_at, owner_map FROM notes WHERE workspace_id = ? ORDER BY updated_at DESC, id DESC";
+pub const Q004: &str = "SELECT id, workspace_id, slug, title, content, created_at, updated_at, owner_map FROM notes WHERE workspace_id = ? AND slug = ?";
+pub const Q005: &str = "INSERT INTO notes (workspace_id, slug, title) VALUES (?, ?, ?)";
+pub const Q006: &str = "UPDATE notes SET content = ?, owner_map = ?, updated_at = CURRENT_TIMESTAMP WHERE id = ?";
+pub const Q007: &str = "UPDATE workspaces SET updated_at = CURRENT_TIMESTAMP WHERE id = ?";
+pub const Q008: &str = "INSERT INTO note_revisions (note_id, content, author, owner_map) VALUES (?, ?, ?, ?)";
+pub const Q009: &str = "SELECT updated_at FROM notes WHERE id = ?";
+pub const Q010: &str = "SELECT id, content, created_at, author, owner_map FROM note_revisions WHERE note_id = ? ORDER BY id DESC LIMIT 100";
+pub const Q011: &str = "SELECT id, slug, title, content, password_hash, created_at, updated_at, owner_map FROM pads WHERE slug = ?";
+pub const Q012: &str = "INSERT INTO pads (slug, title, password_hash) VALUES (?, ?, ?)";
+pub const Q013: &str = "UPDATE pads SET content = ?, owner_map = ?, updated_at = CURRENT_TIMESTAMP WHERE id = ?";
+pub const Q014: &str = "INSERT INTO revisions (pad_id, content, author, owner_map) VALUES (?, ?, ?, ?)";
+pub const Q015: &str = "SELECT updated_at FROM pads WHERE id = ?";
+pub const Q016: &str = "SELECT id, content, created_at, author, owner_map FROM revisions WHERE pad_id = ? ORDER BY id DESC LIMIT 100";
+pub const Q017: &str = "SELECT token FROM published_pages WHERE pad_id = ?";
+pub const Q018: &str = "INSERT INTO published_pages (token, pad_id) VALUES (?, ?)";
+pub const Q019: &str = "SELECT token FROM published_pages WHERE note_id = ?";
+pub const Q020: &str = "INSERT INTO published_pages (token, note_id) VALUES (?, ?)";
+pub const Q021: &str = "SELECT pp.token, COALESCE(p.title, n.title) AS title, COALESCE(p.content, n.content) AS content, COALESCE(p.updated_at, n.updated_at) AS updated_at FROM published_pages pp LEFT JOIN pads p ON p.id = pp.pad_id LEFT JOIN notes n ON n.id = pp.note_id WHERE pp.token = ?";
+pub const Q022: &str = "SELECT file_token FROM pads WHERE id = ?";
+pub const Q023: &str = "UPDATE pads SET file_token = ? WHERE id = ? AND file_token IS NULL";
+pub const Q024: &str = "SELECT file_token FROM notes WHERE id = ?";
+pub const Q025: &str = "UPDATE notes SET file_token = ? WHERE id = ? AND file_token IS NULL";
+pub const Q026: &str = "SELECT id FROM pads WHERE file_token = ?";
+pub const Q027: &str = "SELECT id FROM notes WHERE file_token = ?";
+
+static POSTGRES_QUERIES: OnceLock<Mutex<HashMap<&'static str, &'static str>>> = OnceLock::new();
+
+pub fn get(kind: DatabaseKind, query: &'static str) -> &'static str {
+    if kind != DatabaseKind::Postgres { return query; }
+    let cache = POSTGRES_QUERIES.get_or_init(|| Mutex::new(HashMap::new()));
+    let mut cache = cache.lock().expect("query cache lock poisoned");
+    if let Some(value) = cache.get(query) { return value; }
+    let cache_key = query;
+    let query = query.replace("CURRENT_TIMESTAMP", "(CURRENT_TIMESTAMP::text)");
+    let mut index = 0;
+    let mut converted = String::with_capacity(query.len() + 8);
+    for ch in query.chars() {
+        if ch == '?' {
+            index += 1;
+            converted.push('$');
+            converted.push_str(&index.to_string());
+        } else {
+            converted.push(ch);
+        }
+    }
+    let converted = Box::leak(converted.into_boxed_str());
+    cache.insert(cache_key, converted);
+    converted
+}

src/state.rs

@@ -1,5 +1,5 @@
 use std::{collections::HashMap, sync::Arc};
-use sqlx::SqlitePool;
+use crate::database::Database;
 use tokio::sync::{broadcast, RwLock};
 
 const CHANNEL_CAPACITY: usize = 256;
@@ -15,7 +15,7 @@ pub struct NoteUpdate {
 
 #[derive(Debug)]
 pub struct AppState {
-    pub db: SqlitePool,
+    pub db: Database,
     pub asset_version: String,
     pub files_dir: String,
     pub upload_max_size_bytes: usize,
@@ -23,7 +23,7 @@ pub struct AppState {
 }
 
 impl AppState {
-    pub fn new(db: SqlitePool, asset_version: String, files_dir: String, upload_max_size_bytes: usize) -> Self {
+    pub fn new(db: Database, asset_version: String, files_dir: String, upload_max_size_bytes: usize) -> Self {
         Self { db, asset_version, files_dir, upload_max_size_bytes, channels: RwLock::new(HashMap::new()) }
     }
     async fn channel_for_key(&self, key: String) -> broadcast::Sender<NoteUpdate> {

static/home.html

@@ -59,5 +59,6 @@
       </section>
     </div>
   </main>
+  <footer class="site-footer">Author: <a href="https://linuxiarz.pl" rel="author noopener">@linuxiarz.pl</a></footer>
 </body>
 </html>

static/styles.css

@@ -239,3 +239,12 @@ dialog::backdrop { background: rgba(4,6,9,.82); }
 .public-content { min-height: 240px; padding: 32px; border: 1px solid var(--border); border-radius: 14px; background: var(--surface); }
 .public-content img { cursor: zoom-in; }
 @media (max-width: 600px) { .public-document { padding-top: 32px; } .public-content { padding: 20px; } }
+
+
+/* Layout safeguards and home footer */
+.app-header__main, .document-heading { min-width: 0; }
+.document-url { overflow-wrap: anywhere; }
+.site-footer { width: min(1040px, calc(100% - 32px)); margin: -36px auto 28px; color: var(--muted-2); font-size: .76rem; text-align: center; }
+.site-footer a { color: var(--muted); text-decoration: none; }
+.site-footer a:hover { color: white; }
+@media (max-width: 760px) { .site-footer { width: min(100% - 24px, 560px); margin-top: -20px; } }