Use Cassandra service for unit tests (#40)

Use Cassandra service for unit tests.

### Motivation:

To speed up and simplify unit tests which rely on a running Cassandra
server.

### Modifications:

* Use a Cassandra service instead of installing and running Cassandra in
the test container
* Tidy up existing actions workflows
  * Combine `main.yml` and `scheduled.yml`
  * Remove non-functional Swift 6 Language mode
* Extend Cassandra timeouts in tests to combat flakiness seen in local
tests.

### Result:

Faster unit tests.

.github/workflows/main.yml

@@ -3,15 +3,19 @@ name: Main
 on:
   push:
     branches: [main]
+  schedule:
+    - cron: "0 8,20 * * *"
 
 jobs:
   unit-tests:
-    name: Unit Tests
-    # Workaround https://github.com/nektos/act/issues/1875
-    uses: apple/swift-nio/.github/workflows/swift_matrix.yml@main
+    name: Unit tests
+    uses: ./.github/workflows/unit_tests.yml
     with:
-      name: "Unit tests"
-      matrix_linux_command: "I_AM_RUNNING_IN_CI=true ./scripts/gha_run_unit_tests.sh"
+      linux_5_9_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -strict-concurrency=complete"
+      linux_5_10_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -strict-concurrency=complete"
+      linux_6_0_arguments_override: "--explicit-target-dependency-import-check error"
+      linux_nightly_6_0_arguments_override: "--explicit-target-dependency-import-check error"
+      linux_nightly_main_arguments_override: "--explicit-target-dependency-import-check error"
 
   cxx-interop:
     name: Cxx interop

.github/workflows/pull_request.yml

@@ -1,30 +1,27 @@
 name: PR
 
 on:
-    pull_request:
-        types: [opened, reopened, synchronize]
+  pull_request:
+    types: [opened, reopened, synchronize]
 
 jobs:
-    soundness:
-        name: Soundness
-        uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main
-        with:
-            license_header_check_project_name: "Swift Cassandra Client"
-            api_breakage_check_enabled: false
+  soundness:
+    name: Soundness
+    uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main
+    with:
+      license_header_check_project_name: "Swift Cassandra Client"
+      api_breakage_check_enabled: false
 
-    unit-tests:
-        name: Unit Tests
-        # Workaround https://github.com/nektos/act/issues/1875
-        uses: apple/swift-nio/.github/workflows/swift_matrix.yml@main
-        with:
-            name: "Unit tests"
-            matrix_linux_command: "I_AM_RUNNING_IN_CI=true ./scripts/gha_run_unit_tests.sh"
+  new-unit-tests:
+    name: Unit tests
+    uses: ./.github/workflows/unit_tests.yml
+    with:
+      linux_5_9_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -strict-concurrency=complete"
+      linux_5_10_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -strict-concurrency=complete"
+      linux_6_0_arguments_override: "--explicit-target-dependency-import-check error"
+      linux_nightly_6_0_arguments_override: "--explicit-target-dependency-import-check error"
+      linux_nightly_main_arguments_override: "--explicit-target-dependency-import-check error"
 
-    cxx-interop:
-        name: Cxx interop
-        uses: apple/swift-nio/.github/workflows/cxx_interop.yml@main
-
-    swift-6-language-mode:
-        name: Swift 6 Language Mode
-        uses: apple/swift-nio/.github/workflows/swift_6_language_mode.yml@main
-        if: false  # Disabled for now.
+  cxx-interop:
+    name: Cxx interop
+    uses: apple/swift-nio/.github/workflows/cxx_interop.yml@main

.github/workflows/unit_tests.yml

@@ -0,0 +1,109 @@
+name: Unit tests
+
+on:
+  workflow_call:
+    inputs:
+      linux_5_9_enabled:
+        type: boolean
+        description: "Boolean to enable the Linux 5.9 Swift version matrix job. Defaults to true."
+        default: true
+      linux_5_9_arguments_override:
+        type: string
+        description: "The arguments passed to swift test in the Linux 5.9 Swift version matrix job."
+        default: ""
+      linux_5_10_enabled:
+        type: boolean
+        description: "Boolean to enable the Linux 5.10 Swift version matrix job. Defaults to true."
+        default: true
+      linux_5_10_arguments_override:
+        type: string
+        description: "The arguments passed to swift test in the Linux 5.10 Swift version matrix job."
+        default: ""
+      linux_6_0_enabled:
+        type: boolean
+        description: "Boolean to enable the Linux 6.0 Swift version matrix job. Defaults to true."
+        default: true
+      linux_6_0_arguments_override:
+        type: string
+        description: "The arguments passed to swift test in the Linux 6.0 Swift version matrix job."
+        default: ""
+      linux_nightly_6_0_enabled:
+        type: boolean
+        description: "Boolean to enable the Linux nightly 6.0 Swift version matrix job. Defaults to true."
+        default: true
+      linux_nightly_6_0_arguments_override:
+        type: string
+        description: "The arguments passed to swift test in the Linux nightly 6.0 Swift version matrix job."
+        default: ""
+      linux_nightly_main_enabled:
+        type: boolean
+        description: "Boolean to enable the Linux nightly main Swift version matrix job. Defaults to true."
+        default: true
+      linux_nightly_main_arguments_override:
+        type: string
+        description: "The arguments passed to swift test in the Linux nightly main Swift version matrix job."
+        default: ""
+
+jobs:
+  unit-tests:
+    name: Unit tests
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        # We are specifying only the major and minor of the docker images to automatically pick up the latest patch release
+        swift:
+          - image: "swift:5.9-jammy"
+            swift_version: "5.9"
+            enabled: ${{ inputs.linux_5_9_enabled }}
+          - image: "swift:5.10-jammy"
+            swift_version: "5.10"
+            enabled: ${{ inputs.linux_5_10_enabled }}
+          - image: "swift:6.0-jammy"
+            swift_version: "6.0"
+            enabled: ${{ inputs.linux_6_0_enabled }}
+          - image: "swiftlang/swift:nightly-6.0-jammy"
+            swift_version: "nightly-6.0"
+            enabled: ${{ inputs.linux_nightly_6_0_enabled }}
+          - image: "swiftlang/swift:nightly-main-jammy"
+            swift_version: "nightly-main"
+            enabled: ${{ inputs.linux_nightly_main_enabled }}
+    steps:
+      - name: Checkout repository
+        if: ${{ matrix.swift.enabled }}
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+          submodules: true
+      - name: Mark the workspace as safe
+        if: ${{ matrix.swift.enabled }}
+        # https://github.com/actions/checkout/issues/766
+        run: git config --global --add safe.directory ${GITHUB_WORKSPACE}
+      - name: Run matrix job
+        if: ${{ matrix.swift.enabled }}
+        env:
+          SWIFT_VERSION: ${{ matrix.swift.swift_version }}
+          COMMAND: "swift test"
+          COMMAND_OVERRIDE_5_9: "swift test ${{ inputs.linux_5_9_arguments_override }}"
+          COMMAND_OVERRIDE_5_10: "swift test ${{ inputs.linux_5_10_arguments_override }}"
+          COMMAND_OVERRIDE_6_0: "swift test ${{ inputs.linux_6_0_arguments_override }}"
+          COMMAND_OVERRIDE_NIGHTLY_6_0: "swift test ${{ inputs.linux_nightly_6_0_arguments_override }}"
+          COMMAND_OVERRIDE_NIGHTLY_MAIN: "swift test ${{ inputs.linux_nightly_main_arguments_override }}"
+          CASSANDRA_HOST: cassandra
+          CASSANDRA_CQL_PORT: 9042
+          CASSANDRA_USER: cassandra
+          CASSANDRA_PASSWORD: cassandra
+          CASSANDRA_KEYSPACE: cassandra
+        run: |
+          apt-get -qq update && apt-get -qq -y install curl
+          curl -s https://raw.githubusercontent.com/apple/swift-nio/main/scripts/check-matrix-job.sh | bash
+    container:
+      image: ${{ matrix.swift.image }}
+    services:
+      cassandra:
+        image: cassandra:3.11
+        env:
+          CASSANDRA_CQL_PORT: 9042
+          CASSANDRA_USER: cassandra
+          CASSANDRA_PASSWORD: cassandra
+          CASSANDRA_KEYSPACE: cassandra

Tests/CassandraClientTests/CassandraClientTests.swift

@@ -38,6 +38,8 @@ final class Tests: XCTestCase {
         self.configuration.username = env["CASSANDRA_USER"]
         self.configuration.password = env["CASSANDRA_PASSWORD"]
         self.configuration.keyspace = keyspace
+        self.configuration.requestTimeoutMillis = UInt32(24_000)  // Default: 12_000 ms
+        self.configuration.connectTimeoutMillis = UInt32(10_000)  // Default: 5_000 ms
 
         var logger = Logger(label: "test")
         logger.logLevel = .debug