sqlx-adapter is the Sqlx adapter for casbin-rs. With this library, Casbin can load policy from Sqlx supported database or save policy to it with fully asynchronous support.

Based on Sqlx, The current supported databases are:

• MySQL
• PostgreSQL
• SQLite

In order to unify the database table name in Casbin ecosystem, we decide to use casbin_rule instead of casbin_rules from version 0.4.0. If you are using old version sqlx-adapter in your production environment, please use following command and update sqlx-adapter version:

# MySQL & PostgreSQL & SQLite
ALTER TABLE casbin_rules RENAME TO casbin_rule;

Add the following to Cargo.toml:

For MySQL:

sqlx-adapter = { version = "1.2.0", default-features = false, features = ["mysql", "runtime-tokio-native-tls"]}
tokio = { version = "1.1.1", features = ["macros"] }

For PostgreSQL:

sqlx-adapter = { version = "1.2.0", default-features = false, features = ["postgres", "runtime-tokio-native-tls"]}
tokio = { version = "1.1.1", features = ["macros"] }

For SQLite:

sqlx-adapter = { version = "1.2.0", default-features = false, features = ["sqlite", "runtime-tokio-native-tls"]}
tokio = { version = "1.1.1", features = ["macros"] }

Warning: tokio v1.0 or later is supported from sqlx-adapter v0.4.0, we recommend that you upgrade the relevant components to ensure that they work properly. The last version that supports tokio v0.2 is sqlx-adapter v0.3.0 , you can choose according to your needs.

1. Set up database environment

   You must prepare the database environment so that Sqlx can do static check with queries during compile time. One convenient option is using docker to get your database environment ready:

   #!/bin/bash
   
   DIS=$(lsb_release -is)
   
   command -v docker > /dev/null 2>&1 || {
       echo "Please install docker before running this script." && exit 1;
   }
   
   if [ $DIS == "Ubuntu" ] || [ $DIS == "LinuxMint" ]; then
       sudo apt install -y \
           libpq-dev \
           libmysqlclient-dev \
           postgresql-client \
           mysql-client-core;
   
   elif [ $DIS == "Deepin" ]; then
       sudo apt install -y \
           libpq-dev \
           libmysql++-dev \
           mysql-client \
           postgresql-client;
   elif [ $DIS == "ArchLinux" ] || [ $DIS == "ManjaroLinux" ]; then
       sudo pacman -S libmysqlclient \
           postgresql-libs \
           mysql-clients \;
   else
       echo "Unsupported system: $DIS" && exit 1;
   fi
   
   docker run -itd \
       --restart always \
       -e POSTGRES_USER=casbin_rs \
       -e POSTGRES_PASSWORD=casbin_rs \
       -e POSTGRES_DB=casbin \
       -p 5432:5432 \
       -v /srv/docker/postgresql:/var/lib/postgresql \
       postgres:11;
   
   docker run -itd \
       --restart always \
       -e MYSQL_ALLOW_EMPTY_PASSWORD=yes \
       -e MYSQL_USER=casbin_rs \
       -e MYSQL_PASSWORD=casbin_rs \
       -e MYSQL_DATABASE=casbin \
       -p 3306:3306 \
       -v /srv/docker/mysql:/var/lib/mysql \
       mysql:8 \
       --default-authentication-plugin=mysql_native_password;
   

2. Create table casbin_rule

   # PostgreSQL
   psql postgres://casbin_rs:casbin_rs@127.0.0.1:5432/casbin -c "CREATE TABLE IF NOT EXISTS casbin_rule (
       id SERIAL PRIMARY KEY,
       ptype VARCHAR NOT NULL,
       v0 VARCHAR NOT NULL,
       v1 VARCHAR NOT NULL,
       v2 VARCHAR NOT NULL,
       v3 VARCHAR NOT NULL,
       v4 VARCHAR NOT NULL,
       v5 VARCHAR NOT NULL,
       CONSTRAINT unique_key_sqlx_adapter UNIQUE(ptype, v0, v1, v2, v3, v4, v5)
       );"
   
   # MySQL
   mysql -h 127.0.0.1 -u casbin_rs -pcasbin_rs casbin 
   
   CREATE TABLE IF NOT EXISTS casbin_rule (
       id INT NOT NULL AUTO_INCREMENT,
       ptype VARCHAR(12) NOT NULL,
       v0 VARCHAR(128) NOT NULL,
       v1 VARCHAR(128) NOT NULL,
       v2 VARCHAR(128) NOT NULL,
       v3 VARCHAR(128) NOT NULL,
       v4 VARCHAR(128) NOT NULL,
       v5 VARCHAR(128) NOT NULL,
       PRIMARY KEY(id),
       CONSTRAINT unique_key_sqlx_adapter UNIQUE(ptype, v0, v1, v2, v3, v4, v5)
       ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
   
   # SQLite
   touch casbin.db
   
   sqlite3 casbin.db -cmd "CREATE TABLE IF NOT EXISTS casbin_rule (
      id INTEGER PRIMARY KEY,
      ptype VARCHAR(12) NOT NULL,
      v0 VARCHAR(128) NOT NULL,
      v1 VARCHAR(128) NOT NULL,
      v2 VARCHAR(128) NOT NULL,
      v3 VARCHAR(128) NOT NULL,
      v4 VARCHAR(128) NOT NULL,
      v5 VARCHAR(128) NOT NULL,
      CONSTRAINT unique_key_diesel_adapter UNIQUE(ptype, v0, v1, v2, v3, v4, v5)
      );"

3. Configure env

   Rename sample.env to .env and put DATABASE_URL, POOL_SIZE inside

   DATABASE_URL=postgres://casbin_rs:casbin_rs@localhost:5432/casbin
   # DATABASE_URL=mysql://casbin_rs:casbin_rs@localhost:3306/casbin
   # DATABASE_URL=sqlite:casbin.db
   POOL_SIZE=8

   Or you can export DATABASE_URL, POOL_SIZE

   export DATABASE_URL=postgres://casbin_rs:casbin_rs@localhost:5432/casbin
   export POOL_SIZE=8

use sqlx_adapter::casbin::prelude::*;
use sqlx_adapter::casbin::Result;
use sqlx_adapter::SqlxAdapter;

#[tokio::main]
async fn main() -> Result<()> {
    let m = DefaultModel::from_file("examples/rbac_model.conf").await?;
    
    let a = SqlxAdapter::new("postgres://casbin_rs:casbin_rs@127.0.0.1:5432/casbin", 8).await?;
    let mut e = Enforcer::new(m, a).await?;
    
    Ok(())
}

• postgres
• mysql
• sqlite

Attention: postgres, mysql, sqlite are mutual exclusive which means that you can only activate one of them.