Implementation of tokio-postgres (#1)

adaptation of sqlx adapter to tokio-postgres, uses deadpool-postgres as pool manager

.github/dependabot.yml

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+version: 2
+updates:
+- package-ecosystem: cargo
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "13:00"
+  open-pull-requests-limit: 10
+  ignore:
+  - dependency-name: actix-rt
+    versions:
+    - 2.7.0
+  - dependency-name: casbin
+    versions:
+    - 2.0.9
+  - dependency-name: tokio
+    versions:
+    - 1.19.0

.github/workflows/ci.yml

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+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: Auto Build CI
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, windows-latest, macOS-latest ]
+        rust: [ stable, beta, nightly ]
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@master
+
+      - name: Install Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          components: rustfmt, clippy
+          override: true
+
+      - name: Setup PostgreSQL (for ubuntu)
+        if: matrix.os == 'ubuntu-latest'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libpq-dev postgresql
+          echo "host    all             all             127.0.0.1/32            md5" > sudo tee -a /etc/postgresql/10/main/pg_hba.conf
+          sudo service postgresql restart && sleep 3
+          sudo -u postgres createuser casbin_rs
+          sudo -u postgres createdb casbin
+          sudo -u postgres psql -c "alter user casbin_rs with encrypted password 'casbin_rs'; grant all privileges on database casbin to casbin_rs;"
+          sudo service postgresql restart && sleep 3
+
+      - name: Setup PostgreSQL (for macOS)
+        if: matrix.os == 'macOS-latest'
+        run: |
+          brew update
+          pg_ctl -D /usr/local/var/postgres start
+          sleep 3
+          createuser casbin_rs
+          createdb casbin
+          psql postgres -c "alter user casbin_rs with encrypted password 'casbin_rs'; grant all privileges on database casbin to casbin_rs;"
+
+      - name: Setup PostgreSQL (for windows)
+        if: matrix.os == 'windows-latest'
+        shell: cmd
+        run: |
+          choco install postgresql11 --force --params '/Password:root'
+          "C:\Program Files\PostgreSQL\11\bin\createuser" casbin_rs
+          "C:\Program Files\PostgreSQL\11\bin\createdb" casbin
+          "C:\Program Files\PostgreSQL\11\bin\psql" -c "alter user casbin_rs with encrypted password 'casbin_rs'; grant all privileges on database casbin to casbin_rs;"
+
+      - name: Set environment variables (for windows)
+        if: matrix.os == 'windows-latest'
+        shell: bash
+        run: |
+          echo "C:\Program Files\PostgreSQL\11\bin" >> $GITHUB_PATH
+          echo "PQ_LIB_DIR=C:\Program Files\PostgreSQL\11\lib" >> $GITHUB_ENV
+
+      - name: Create PostgresSQL Table
+        run: psql -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)
+          );" postgres://casbin_rs:[email protected]:5432/casbin
+
+      - name: Cargo Build
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+
+      # PostgreSQL tests
+      # tokio
+      - name: Cargo Test For PostgreSQL,runtime-tokio
+        uses: actions-rs/cargo@v1
+        env:
+          DATABASE_URL: postgres://casbin_rs:casbin_rs@localhost:5432/casbin
+        with:
+          command: test
+          args: --no-default-features --features runtime-tokio
+
+      - name: Cargo Clippy
+        uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: -- -D warnings
+
+      - name: Cargo Fmt Check
+        uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check

.github/workflows/coverage.yml

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+name: Coverage
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  cover:
+    name: Auto Codecov Coverage
+    runs-on: ubuntu-latest
+
+    services:
+      postgres:
+        image: postgres:11
+        env:
+          POSTGRES_USER: casbin_rs
+          POSTGRES_PASSWORD: casbin_rs
+          POSTGRES_DB: casbin
+        ports:
+          - 5432:5432
+        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@master
+
+      - name: Install Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+
+      - name: Install PostgreSQL Dependencies
+        run: sudo apt-get install libpq-dev postgresql-client
+
+      - name: Create Table
+        run: psql postgres://casbin_rs:[email protected]: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)
+            );"
+
+      - name: Run cargo-tarpaulin
+        uses: actions-rs/[email protected]
+        env:
+          DATABASE_URL: postgres://casbin_rs:casbin_rs@localhost:5432/casbin
+        with:
+          args: --avoid-cfg-tarpaulin --out Xml
+
+      - name: Upload to codecov.io
+        uses: codecov/codecov-action@v1
+        with:
+          token: ${{secrets.CODECOV_TOKEN}}

.github/workflows/release.yml

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+name: Auto Release
+
+on:
+  push:
+    # Sequence of patterns matched against refs/tags
+    tags:
+      - "v*" # Push events to matching v*, i.e. v1.0, v20.15.10
+
+jobs:
+  release:
+    name: Auto Release by Tags
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@master
+
+      - name: Install Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+
+      - name: Cargo Login
+        uses: actions-rs/cargo@v1
+        with:
+          command: login
+          args: -- ${{ secrets.CARGO_TOKEN }}
+
+      - name: Cargo Publish
+        uses: actions-rs/cargo@v1
+        with:
+          command: publish
+          args: --no-verify
+
+      - name: GitHub Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # This token is provided by Actions, you do not need to create your own token
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ github.ref }}
+          draft: false
+          prerelease: false

.gitignore

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+# Generated by Cargo
+# will have compiled files and executables
+/target
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# Ignore ENV files
+.env
+
+# Ignore IDE files
+.vscode/
+.idea/
+.DS_Store
+
+# Ignore sqlite DB files
+*.db
+*.db-wal
+*.db-shm

Cargo.toml

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+[package]
+name = "tokio-postgres-adapter"
+version = "0.1.0"
+authors = ["Eason Chai <[email protected]>", "Cheng JIANG <[email protected]>", "David Miguel <[email protected]>"]
+edition = "2021"
+license = "Apache-2.0"
+description = "tokio-postgres adapter for casbin-rs"
+homepage= "https://github.com/casbin-rs/postgres-adapter"
+readme= "README.md"
+
+[dependencies]
+casbin = { version = "2.0.9", default-features = false }
+async-trait = "0.1.56"
+dotenv = { version = "0.15.0", default-features = false }
+tokio = { version = "1.19.2", default-features = false, optional = true }
+tokio-postgres = { version = "0.7.6", default-features = false }
+deadpool-postgres = { version = "0.10.2", default-features = false }
+deadpool = { version = "0.9.5", default-features = false }
+futures = "0.3"
+
+[features]
+default = ["runtime-tokio"]
+runtime-tokio = ["casbin/runtime-tokio", "deadpool/rt_tokio_1"]
+
+[dev-dependencies]
+tokio = { version = "1.19.2", features = [ "full" ] }
+
+[profile.release]
+codegen-units = 1
+lto           = true
+opt-level     = 3
+
+[profile.dev]
+split-debuginfo = "unpacked"