Speed up other CI jobs by avoiding the usage of a live Postgres database

.github/workflows/general.yml

@@ -21,6 +21,7 @@ jobs:
   test:
     name: Test
     runs-on: ubuntu-latest
+    # Service containers to run alongside the `test` container job
     services:
       postgres:
         # Docker Hub image
@@ -43,6 +44,7 @@ jobs:
       # It also takes care of caching intermediate build artifacts.
       - name: Install the Rust toolchain
         uses: actions-rust-lang/setup-rust-toolchain@v1
+
       - name: Install sqlx-cli
         run:
           cargo install sqlx-cli
@@ -53,13 +55,18 @@ jobs:
           # The --locked flag can be used to force Cargo to use the packaged Cargo.lock file if it is available.
           # This may be useful for ensuring reproducible builds, to use the exact same set of dependencies that were available when the package was published.
           # It may also be useful if a newer version of a dependency is published that no longer builds on your system, or has other problems
+
       - name: Migrate database
         run: |
-          sudo apt-get install libpq-dev -y
           SKIP_DOCKER=true ./scripts/init_db.sh
+
       - name: Run tests
         run: cargo test
 
+      - name: Check that queries are fresh
+        run: cargo sqlx prepare --workspace --check -- --all-targets
+
+  # `fmt` container job
   fmt:
     name: Rustfmt
     runs-on: ubuntu-latest
@@ -75,31 +82,20 @@ jobs:
   clippy:
     name: Clippy
     runs-on: ubuntu-latest
-    services:
-      postgres:
-        image: postgres:14
-        env:
-          POSTGRES_USER: postgres
-          POSTGRES_PASSWORD: password
-          POSTGRES_DB: postgres
-        ports:
-          - 5432:5432
+    env:
+      # This environment variable forces sqlx to use its offline mode,
+      # which means that it will not attempt to connect to a database
+      # when running the tests. It'll instead use the cached query results.
+      # We check that the cached query results are up-to-date in another job,
+      # to speed up the overall CI pipeline.
+      # This will all be covered in detail in chapter 5.
+      SQLX_OFFLINE: true
     steps:
       - uses: actions/checkout@v4
       - name: Install the Rust toolchain
         uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
           components: clippy
-      - name: Install sqlx-cli
-        run: cargo install sqlx-cli
-          --version=${{ env.SQLX_VERSION }}
-          --features ${{ env.SQLX_FEATURES }}
-          --no-default-features
-          --locked
-      - name: Migrate database
-        run: |
-          sudo apt-get install libpq-dev -y
-          SKIP_DOCKER=true ./scripts/init_db.sh
       - name: Linting
         run: cargo clippy -- -D warnings
 

.sqlx/query-793f0df728d217c204123f12e4eafd6439db2d49d0cb506618ae9e780c7e0558.json

@@ -0,0 +1,17 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "\n    INSERT INTO subscriptions (id, email, name, subscribed_at)\n    VALUES ($1, $2, $3, $4)\n            ",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Left": [
+        "Uuid",
+        "Text",
+        "Text",
+        "Timestamptz"
+      ]
+    },
+    "nullable": []
+  },
+  "hash": "793f0df728d217c204123f12e4eafd6439db2d49d0cb506618ae9e780c7e0558"
+}

.sqlx/query-ed279fc2dda0c3ede3e81a4500fcaa9da2220f8a9ad6c1debc3095deb9f84759.json

@@ -0,0 +1,26 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "SELECT email, name FROM subscriptions",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "email",
+        "type_info": "Text"
+      },
+      {
+        "ordinal": 1,
+        "name": "name",
+        "type_info": "Text"
+      }
+    ],
+    "parameters": {
+      "Left": []
+    },
+    "nullable": [
+      false,
+      false
+    ]
+  },
+  "hash": "ed279fc2dda0c3ede3e81a4500fcaa9da2220f8a9ad6c1debc3095deb9f84759"
+}