Add a test for the PostgresNIO Swift client library.

It supports SNI. See discussion at
https://community.neon.tech/t/postgresnio-swift-sni-support/419/4

test_runner/pg_clients/swift/PostgresNIOExample/.dockerignore

@@ -0,0 +1 @@
+.build/

test_runner/pg_clients/swift/PostgresNIOExample/.gitignore

@@ -0,0 +1 @@
+.build/

test_runner/pg_clients/swift/PostgresNIOExample/Dockerfile

@@ -0,0 +1,10 @@
+FROM swift:5.7 AS build
+WORKDIR /source
+
+COPY . .
+RUN swift build --configuration release
+
+FROM swift:5.7
+WORKDIR /app
+COPY --from=build /source/.build/release .
+CMD ["/app/PostgresNIOExample"]

test_runner/pg_clients/swift/PostgresNIOExample/Package.resolved

@@ -0,0 +1,86 @@
+{
+  "pins" : [
+    {
+      "identity" : "postgres-nio",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/vapor/postgres-nio.git",
+      "state" : {
+        "revision" : "7daf026e145de2c07d6e37f4171b1acb4b5f22b1",
+        "version" : "1.12.1"
+      }
+    },
+    {
+      "identity" : "swift-atomics",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-atomics.git",
+      "state" : {
+        "revision" : "ff3d2212b6b093db7f177d0855adbc4ef9c5f036",
+        "version" : "1.0.3"
+      }
+    },
+    {
+      "identity" : "swift-collections",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-collections.git",
+      "state" : {
+        "revision" : "937e904258d22af6e447a0b72c0bc67583ef64a2",
+        "version" : "1.0.4"
+      }
+    },
+    {
+      "identity" : "swift-crypto",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-crypto.git",
+      "state" : {
+        "revision" : "75ec60b8b4cc0f085c3ac414f3dca5625fa3588e",
+        "version" : "2.2.4"
+      }
+    },
+    {
+      "identity" : "swift-log",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-log.git",
+      "state" : {
+        "revision" : "32e8d724467f8fe623624570367e3d50c5638e46",
+        "version" : "1.5.2"
+      }
+    },
+    {
+      "identity" : "swift-metrics",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-metrics.git",
+      "state" : {
+        "revision" : "9b39d811a83cf18b79d7d5513b06f8b290198b10",
+        "version" : "2.3.3"
+      }
+    },
+    {
+      "identity" : "swift-nio",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-nio.git",
+      "state" : {
+        "revision" : "45167b8006448c79dda4b7bd604e07a034c15c49",
+        "version" : "2.48.0"
+      }
+    },
+    {
+      "identity" : "swift-nio-ssl",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-nio-ssl.git",
+      "state" : {
+        "revision" : "4fb7ead803e38949eb1d6fabb849206a72c580f3",
+        "version" : "2.23.0"
+      }
+    },
+    {
+      "identity" : "swift-nio-transport-services",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-nio-transport-services.git",
+      "state" : {
+        "revision" : "c0d9a144cfaec8d3d596aadde3039286a266c15c",
+        "version" : "1.15.0"
+      }
+    }
+  ],
+  "version" : 2
+}

test_runner/pg_clients/swift/PostgresNIOExample/Package.swift

@@ -0,0 +1,17 @@
+// swift-tools-version:5.7
+import PackageDescription
+
+let package = Package(
+    name: "PostgresNIOExample",
+    dependencies: [
+        .package(url: "https://github.com/vapor/postgres-nio.git", from: "1.8.0")
+    ],
+    targets: [
+        .executableTarget(
+            name: "PostgresNIOExample",
+            dependencies: [
+                .product(name: "PostgresNIO", package: "postgres-nio"),
+            ]
+	)
+    ]
+)

test_runner/pg_clients/swift/PostgresNIOExample/Sources/PostgresNIOExample/main.swift

@@ -0,0 +1,49 @@
+import Foundation
+
+import PostgresNIO
+import NIOPosix
+import Logging
+
+await Task {
+  do {
+    let eventLoopGroup = MultiThreadedEventLoopGroup(numberOfThreads: 1)
+    let logger = Logger(label: "postgres-logger")
+
+    let env = ProcessInfo.processInfo.environment
+
+    let sslContext = try! NIOSSLContext(configuration: .makeClientConfiguration())
+
+    let config = PostgresConnection.Configuration(
+      connection: .init(
+        host: env["NEON_HOST"] ?? "",
+        port: 5432
+      ),
+      authentication: .init(
+        username: env["NEON_USER"] ?? "",
+        database: env["NEON_DATABASE"] ?? "",
+        password: env["NEON_PASSWORD"] ?? ""
+      ),
+      tls: .require(sslContext)
+    )
+
+    let connection = try await PostgresConnection.connect(
+      on: eventLoopGroup.next(),
+      configuration: config,
+      id: 1,
+      logger: logger
+    )
+
+    let rows = try await connection.query("SELECT 1 as col", logger: logger)
+    for try await (n) in rows.decode((Int).self, context: .default) {
+      print(n)
+    }
+
+    // Close your connection once done
+    try await connection.close()
+
+    // Shutdown the EventLoopGroup, once all connections are closed.
+    try eventLoopGroup.syncShutdownGracefully()
+  } catch {
+      print(error)
+  }
+}.value

test_runner/pg_clients/test_pg_clients.py

@@ -19,6 +19,7 @@ from fixtures.utils import subprocess_capture
             "swift/PostgresClientKitExample",  # See https://github.com/neondatabase/neon/pull/2008#discussion_r911896592
             marks=pytest.mark.xfail(reason="Neither SNI nor parameters is supported"),
         ),
+        "swift/PostgresNIOExample",
         "typescript/postgresql-client",
     ],
 )