feat: add DisableEvents option (#21)

* feat: add DisableEvents option

Signed-off-by: George Helyar <[email protected]>

* nit changes

* add doc

* typos

---------

Signed-off-by: George Helyar <[email protected]>
Co-authored-by: deleteLater <[email protected]>

Author: ghelyar

README.md

@@ -35,7 +35,7 @@ a [preview version](https://www.nuget.org/packages/FeatBit.ServerSdk/absoluteLat
 
 ### Prerequisite
 
-Before using the SDK, you need to obtain the environment secret and SDK URLs. 
+Before using the SDK, you need to obtain the environment secret and SDK URLs.
 
 Follow the documentation below to retrieve these values
 
@@ -205,7 +205,7 @@ describing how the value was determined for each type.
 - JsonVariation/JsonVariationDetail (in consideration)
 
 > **Note**
-> Since the current version does not have native support for retrieving JSON variations, you can utilize the `StringVariation` method as an alternative to obtain the JSON string.
+> Since the current version does not have native support for retrieving JSON variations, you can use the `StringVariation` method as an alternative to get the JSON string.
 
 Variation calls take the feature flag key, a FbUser, and a default value. If any error makes it impossible to
 evaluate the flag (for instance, the feature flag key does not match any existing flag), default value is returned.
@@ -247,7 +247,7 @@ var options = new FbOptionsBuilder()
 var client = new FbClient(options);
 ```
 
-When you put the SDK in offline mode, no insight message is sent to the server and all feature flag evaluations return
+When you put the SDK in offline mode, no events are sent to the server and all feature flag evaluations return
 fallback values because there are no feature flags or segments available. If you want to use your own data source in
 this case, the sdk allows users to populate feature flags and segments data from a JSON string. Here is an
 example: [featbit-bootstrap.json](/tests/FeatBit.ServerSdk.Tests/Bootstrapping/featbit-bootstrap.json).
@@ -278,6 +278,20 @@ var options = new FbOptionsBuilder()
 var client = new FbClient(options);
 ```
 
+### Disable Events Collection
+
+By default, the SDK automatically sends events (flag evaluation events and metric events for A/B testing) to the FeatBit
+server, unless the SDK is in offline mode.
+
+If you prefer to disable this event collection while the SDK is in online mode, you
+can configure this behavior using the `DisableEvents` option.
+
+```csharp
+var options = new FbOptionsBuilder()
+    .DisableEvents(true)
+    .Build();
+```
+
 ### Experiments (A/B/n Testing)
 
 We support automatic experiments for pageviews and clicks, you just need to set your experiment on our SaaS platform,

src/FeatBit.ServerSdk/FbClient.cs

@@ -123,18 +123,20 @@ public FbClient(FbOptions options)
             _store = new DefaultMemoryStore();
             _evaluator = new Evaluator(_store);
 
+            _eventProcessor = _options.Offline || _options.DisableEvents
+                ? new NullEventProcessor()
+                : new DefaultEventProcessor(options);
+
             if (_options.Offline)
             {
                 _dataSynchronizer = new NullDataSynchronizer();
-                _eventProcessor = new NullEventProcessor();
 
                 // use bootstrap provider to populate store
                 _options.BootstrapProvider.Populate(_store);
             }
             else
             {
                 _dataSynchronizer = new WebSocketDataSynchronizer(options, _store);
-                _eventProcessor = new DefaultEventProcessor(options);
             }
 
             _logger = options.LoggerFactory.CreateLogger<FbClient>();

src/FeatBit.ServerSdk/Options/FbOptions.cs

@@ -17,7 +17,7 @@ public sealed class FbOptions
         public TimeSpan StartWaitTime { get; set; }
 
         /// <summary>
-        /// Whether or not this client is offline. If true, no calls to FeatBit will be made.
+        /// Whether this client is offline. If true, no calls to FeatBit will be made.
         /// </summary>
         /// <value>Defaults to <c>false</c></value>
         public bool Offline { get; set; }
@@ -28,6 +28,11 @@ public sealed class FbOptions
         /// <value>Defaults to <see cref="NullBootstrapProvider"/></value>
         internal IBootstrapProvider BootstrapProvider { get; set; }
 
+        /// <summary>
+        /// Whether to disable events collection.
+        /// </summary>
+        public bool DisableEvents { get; set; }
+
         /// <summary>
         /// The SDK key for your FeatBit environment.
         /// </summary>
@@ -132,6 +137,7 @@ public static FbOptions Default(string secret)
         internal FbOptions(
             TimeSpan startWaitTime,
             bool offline,
+            bool disableEvents,
             string envSecret,
             Uri streamingUri,
             Uri eventUri,
@@ -151,6 +157,7 @@ internal FbOptions(
         {
             StartWaitTime = startWaitTime;
             Offline = offline;
+            DisableEvents = disableEvents;
 
             EnvSecret = envSecret;
             StreamingUri = streamingUri;
@@ -175,10 +182,10 @@ internal FbOptions(
 
         internal FbOptions ShallowCopy()
         {
-            var newOptions = new FbOptions(StartWaitTime, Offline, EnvSecret, StreamingUri, EventUri, ConnectTimeout,
-                CloseTimeout, KeepAliveInterval, ReconnectRetryDelays, MaxFlushWorker, AutoFlushInterval, FlushTimeout,
-                MaxEventsInQueue, MaxEventPerRequest, MaxSendEventAttempts, SendEventRetryInterval, BootstrapProvider,
-                LoggerFactory);
+            var newOptions = new FbOptions(StartWaitTime, Offline, DisableEvents, EnvSecret, StreamingUri, EventUri,
+                ConnectTimeout, CloseTimeout, KeepAliveInterval, ReconnectRetryDelays, MaxFlushWorker,
+                AutoFlushInterval, FlushTimeout, MaxEventsInQueue, MaxEventPerRequest, MaxSendEventAttempts,
+                SendEventRetryInterval, BootstrapProvider, LoggerFactory);
 
             return newOptions;
         }

src/FeatBit.ServerSdk/Options/FbOptionsBuilder.cs

@@ -10,6 +10,7 @@ public class FbOptionsBuilder
     {
         private TimeSpan _startWaitTime;
         private bool _offline;
+        private bool _disableEvents;
 
         private readonly string _envSecret;
 
@@ -41,6 +42,7 @@ public FbOptionsBuilder(string envSecret)
         {
             _startWaitTime = TimeSpan.FromSeconds(5);
             _offline = false;
+            _disableEvents = false;
 
             _envSecret = envSecret;
 
@@ -70,10 +72,10 @@ public FbOptionsBuilder(string envSecret)
 
         public FbOptions Build()
         {
-            return new FbOptions(_startWaitTime, _offline, _envSecret, _streamingUri, _eventUri, _connectTimeout,
-                _closeTimeout, _keepAliveInterval, _reconnectRetryDelays, _maxFlushWorker, _autoFlushInterval,
-                _flushTimeout, _maxEventsInQueue, _maxEventPerRequest, _maxSendEventAttempts, _sendEventRetryInterval,
-                _bootstrapProvider, _loggerFactory);
+            return new FbOptions(_startWaitTime, _offline, _disableEvents, _envSecret, _streamingUri, _eventUri,
+                _connectTimeout, _closeTimeout, _keepAliveInterval, _reconnectRetryDelays, _maxFlushWorker,
+                _autoFlushInterval, _flushTimeout, _maxEventsInQueue, _maxEventPerRequest, _maxSendEventAttempts,
+                _sendEventRetryInterval, _bootstrapProvider, _loggerFactory);
         }
 
         public FbOptionsBuilder StartWaitTime(TimeSpan timeout)
@@ -122,6 +124,12 @@ public FbOptionsBuilder CloseTimeout(TimeSpan timeout)
             return this;
         }
 
+        public FbOptionsBuilder DisableEvents(bool disableEvents)
+        {
+            _disableEvents = disableEvents;
+            return this;
+        }
+
         public FbOptionsBuilder MaxFlushWorker(int maxFlushWorker)
         {
             _maxFlushWorker = maxFlushWorker;

tests/FeatBit.ServerSdk.Tests/FbClientOfflineTests.cs

@@ -20,7 +20,7 @@ public async Task CreateAndClose()
     }
 
     [Fact]
-    public void UseNullEventProcessor()
+    public void UseNullDataSource()
     {
         var options = new FbOptionsBuilder()
             .Offline(true)
@@ -32,7 +32,7 @@ public void UseNullEventProcessor()
     }
 
     [Fact]
-    public void UseNullDataSource()
+    public void UseNullEventProcessor()
     {
         var options = new FbOptionsBuilder()
             .Offline(true)
@@ -43,6 +43,19 @@ public void UseNullDataSource()
         Assert.IsType<NullEventProcessor>(client._eventProcessor);
     }
 
+    [Fact]
+    public void UseNullEventProcessorWhenEventsAreDisabled()
+    {
+        var options = new FbOptionsBuilder()
+            .Offline(false)
+            .DisableEvents(true)
+            .Build();
+
+        var client = new FbClient(options);
+
+        Assert.IsType<NullEventProcessor>(client._eventProcessor);
+    }
+
     [Fact]
     public void ClientIsInitialized()
     {

tests/FeatBit.ServerSdk.Tests/Options/FbOptionsBuilderTests.HasDefaultValues.verified.txt

@@ -1,6 +1,7 @@
 {
   StartWaitTime: 00:00:05,
   Offline: false,
+  DisableEvents: false,
   EnvSecret: secret,
   StreamingUri: ws://localhost:5100,
   EventUri: http://localhost:5100,