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(DOCSP-39162): Swift: Change baseURL during runtime (#3238)
## Pull Request Info Jira ticket: https://jira.mongodb.org/browse/DOCSP-39162 - [Connect to an App Services App](https://preview-mongodbdacharyc.gatsbyjs.io/realm/DOCSP-39162/sdk/swift/app-services/connect-to-app-services-backend/#connect-to-a-specific-server): New "Connect to a Specific Server" section with baseURL info. New "Connect to a Different Server During Runtime" subsection with info about the new experimental API. Note for reviewer: the failing test is related to the MongoClient API. One operation is failing with a timeout. It all passes locally, so I'm inclined to think this is CI latency issues and we can disregard this failure. ### Reminder Checklist Before merging your PR, make sure to check a few things. - [x] Did you tag pages appropriately? - genre - meta.keywords - meta.description - [x] Describe your PR's changes in the Release Notes section - [x] Create a Jira ticket for related docs-app-services work, if any ### Release Notes - **Swift SDK** - Application Services/Connect to an App Services App: New "Connect to a Specific Server" section with baseURL info. New "Connect to a Different Server During Runtime" subsection with info about the new experimental API. ### Review Guidelines [REVIEWING.md](https://github.com/mongodb/docs-realm/blob/master/REVIEWING.md) --------- Co-authored-by: lindseymoore <71525840+lindseymoore@users.noreply.github.com>
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‎examples/ios/Examples/MongoDBRemoteAccessAggregate.swift

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@@ -276,7 +276,7 @@ class MongoDBRemoteAccessAggregationTestCase: XCTestCase {
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}
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}
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}
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wait(for: [expectation, expectation2, expectation3], timeout: 30)
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wait(for: [expectation, expectation2, expectation3], timeout: 45)
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}
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// MARK: Aggregation Add Fields

‎examples/ios/Examples/RealmApp.swift

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@@ -5,7 +5,12 @@ import XCTest
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import RealmSwift
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// :snippet-end:
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// :snippet-start: import-experimental
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@_spi(RealmSwiftExperimental) import RealmSwift
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// :snippet-end:
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let YOUR_APP_SERVICES_APP_ID = "example-testers-kvjdy"
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let EDGE_SERVER_APP_ID = "new-edge-server-post-hotfix-zadeqrp"
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// :snippet-start: init-realm-app-client
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let app = App(id: YOUR_APP_SERVICES_APP_ID) // replace YOUR_APP_SERVICES_APP_ID with your App ID
@@ -15,10 +20,8 @@ class RealmAppTest: XCTestCase {
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func testRealmAppWithConfig() {
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// :snippet-start: realm-app-config
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let configuration = AppConfiguration(
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baseURL: "https://services.cloud.mongodb.com", // Custom base URL
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baseURL: "https://services.cloud.mongodb.com", // You can customize base URL
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transport: nil, // Custom RLMNetworkTransportProtocol
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localAppName: "My App",
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localAppVersion: "3.14.159",
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defaultRequestTimeoutMS: 30000
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)
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@@ -68,6 +71,58 @@ class RealmAppTest: XCTestCase {
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}
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}
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func testRealmAppWithCustomBaseURL() async {
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// Note for internal review: I tested this manually running an Edge Server
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// on my machine and it succeeds.
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// Until we get Edge Server running in a CI to test against, this will
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// fail in CI. So I'm going to expect this test to fail.
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// :snippet-start: custom-base-url
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// Specify a baseURL to connect to a server other than the default.
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// In this case, an Edge Server instance running on the device.
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let configuration = AppConfiguration(baseURL: "http://localhost:80")
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let edgeApp = App(id: EDGE_SERVER_APP_ID, configuration: configuration)
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// :snippet-end:
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do {
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let user = try await edgeApp.login(credentials: Credentials.anonymous)
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XCTAssert(user.isLoggedIn)
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} catch {
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let error = error.localizedDescription
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XCTAssertEqual(error, "Could not connect to the server.")
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}
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}
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func testChangeBaseURL() async {
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// Note for internal review: I tested this manually running an Edge Server
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// on my machine and it succeeds. Until we get Edge Server running in a CI
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// I can't login to an Edge Server in an automated test, so I can't write
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// automated tests for the full flow.
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// Specify a baseURL to connect to an Edge Server instance running on the device
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let configuration = AppConfiguration(baseURL: "http://localhost:80")
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do {
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// :snippet-start: change-base-url
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// Specify a baseURL to connect to a server other than the default.
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// In this case, an Edge Server instance running on the device.
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let configuration = AppConfiguration(baseURL: "http://localhost:80")
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let edgeApp = App(id: EDGE_SERVER_APP_ID, configuration: configuration)
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// ... log in a user and use the app...
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// ... some time later...
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try await edgeApp.updateBaseUrl(to: "https://services.cloud.mongodb.com")
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// :snippet-end:
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let user = try await edgeApp.login(credentials: Credentials.anonymous)
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XCTAssertNotNil(user)
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XCTAssert(user.isLoggedIn)
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} catch {
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print(error.localizedDescription)
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XCTFail("With a base URL pointing to the cloud, logging in should not fail.")
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}
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}
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override func tearDown() {
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guard app.currentUser != nil else {
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return

‎examples/ios/HostApp/Info.plist

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<string>Realm Docs Examples</string>
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<key>LSRequiresIPhoneOS</key>
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<true/>
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<key>NSAppTransportSecurity</key>
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<dict>
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<key>NSExceptionDomains</key>
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<dict>
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<key>localhost</key>
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<dict>
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<key>NSExceptionAllowsInsecureHTTPLoads</key>
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<true/>
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<key>NSIncludesSubdomains</key>
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<true/>
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</dict>
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</dict>
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</dict>
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<key>UIApplicationSceneManifest</key>
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<dict>
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<key>UIApplicationSupportsMultipleScenes</key>

‎examples/ios/RealmExamples.xcodeproj/xcshareddata/xcschemes/Test Examples.xcscheme

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ReferencedContainer = "container:RealmExamples.xcodeproj">
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</BuildableReference>
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<SkippedTests>
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<Test
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Identifier = "CustomUserData/testUpdateCustomUserData()">
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</Test>
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<Test
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Identifier = "CustomUserDataObjc/testUpdateCustomUserData">
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</Test>
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<Test
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Identifier = "MongoDBRemoteAccessTestCaseAsyncAPIs/testAsyncStreamWatchForChangesInMDBCollection()">
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</Test>

‎source/examples/generated/code/start/RealmApp.snippet.change-base-url.swift

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// Specify a baseURL to connect to a server other than the default.
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// In this case, an Edge Server instance running on the device.
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let configuration = AppConfiguration(baseURL: "http://localhost:80")
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let app = App(id: YOUR_APP_SERVICES_APP_ID, configuration: configuration)
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// ... log in a user and use the app...
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// ... some time later...
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try await app.updateBaseUrl(to: "https://services.cloud.mongodb.com")

‎source/examples/generated/code/start/RealmApp.snippet.custom-base-url.swift

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// Specify a baseURL to connect to a server other than the default.
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// In this case, an Edge Server instance running on the device.
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let configuration = AppConfiguration(baseURL: "http://localhost:80")
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let app = App(id: EDGE_SERVER_APP_ID, configuration: configuration)

‎source/examples/generated/code/start/RealmApp.snippet.import-experimental.swift

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@_spi(RealmSwiftExperimental) import RealmSwift

‎source/examples/generated/code/start/RealmApp.snippet.realm-app-config.swift

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let configuration = AppConfiguration(
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baseURL: "https://services.cloud.mongodb.com", // Custom base URL
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baseURL: "https://services.cloud.mongodb.com", // You can customize base URL
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transport: nil, // Custom RLMNetworkTransportProtocol
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localAppName: "My App",
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localAppVersion: "3.14.159",
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defaultRequestTimeoutMS: 30000
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)
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‎source/sdk/swift/app-services/connect-to-app-services-backend.txt

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@@ -101,6 +101,57 @@ refer to :objc-sdk:`RLMSyncTimeoutOptions <Classes/RLMSyncTimeoutOptions.html>`.
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.. literalinclude:: /examples/generated/code/start/RealmApp.snippet.app-config-sync-timeout.swift
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:language: swift
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.. _swift-connect-to-specific-server:
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Connect to a Specific Server
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----------------------------
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By default, Atlas Device SDK connects to Atlas using the global ``baseURL``
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of ``https://services.cloud.mongodb.com``. In some cases, you may want to
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connect to a different server:
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- Your App Services App uses :ref:`local deployment <local-deployment>`, and
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you want to connect directly to a local ``baseURL`` in your region.
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- You want to connect to an :ref:`Edge Server instance <edge-server-connect-from-client>`.
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You can specify a ``baseURL`` in the
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:swift-sdk:`AppConfiguration <Extensions/AppConfiguration.html>`:
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.. literalinclude:: /examples/generated/code/start/RealmApp.snippet.custom-base-url.swift
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:language: swift
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Connect to a Different Server During Runtime
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. versionadded:: 10.50.0
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In some cases, you might want to change the ``baseURL`` while the app is
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running. For example, you might want to roam between Edge Servers, or
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move from an App Services connection to an Edge Server connection. To change
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the ``baseURL`` during runtime, call the ``app.updateBaseUrl(to: )`` method:
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.. literalinclude:: /examples/generated/code/start/RealmApp.snippet.change-base-url.swift
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:language: swift
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This API is experimental, so you must use the experimental import in the file
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where you want to use this API:
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.. literalinclude:: /examples/generated/code/start/RealmApp.snippet.import-experimental.swift
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:language: swift
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If you want to change the ``baseURL`` after you have logged in a user and
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have opened a synced database, the app must perform a
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:ref:`client reset <ios-client-reset>`. Perform these steps in your code:
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1. :ref:`Pause the Sync session <swift-suspend-sync-session>`.
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2. Update the ``baseURL`` by calling the ``app.updateBaseUrl(to: )`` method.
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3. Authenticate and log the user in again with the new ``baseURL``.
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4. Open a synced database pulling data from the new server.
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Both the server and the client must be online for the user to authenticate and
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connect to the new server. If the server is not online or the client does not
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have a network connection, the user cannot authenticate and open the database.
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Supported Operating Systems
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---------------------------
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‎source/sdk/swift/sync/sync-session.txt

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.. literalinclude:: /examples/generated/code/start/Sync.snippet.check-network-connection.m
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:language: objectivec
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.. _swift-suspend-sync-session:
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Suspend or Resume a Sync Session
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--------------------------------
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