feat: GoFeatureFlagProvider support

currently only supporting configuring the endpoint. Using test containers to
spin up instance to test against

Author: sideshowcoder

src/main/java/io/github/sideshowcoder/dropwizard_openfeature/GoFeatureFlagConfiguration.java

@@ -4,6 +4,7 @@
 
 import dev.openfeature.contrib.providers.gofeatureflag.GoFeatureFlagProviderOptions;
 import dev.openfeature.contrib.providers.gofeatureflag.GoFeatureFlagProviderOptions.GoFeatureFlagProviderOptionsBuilder;
+import dev.openfeature.contrib.providers.gofeatureflag.exception.InvalidOptions;
 import jakarta.validation.constraints.NotNull;
 
 public class GoFeatureFlagConfiguration {
@@ -12,12 +13,14 @@ public class GoFeatureFlagConfiguration {
     @NotNull
     private String endpoint;
 
-    public GoFeatureFlagProviderOptions getGoFeatureFlagProviderOptions() {
+    public GoFeatureFlagProviderOptions getGoFeatureFlagProviderOptions() throws InvalidOptions {
         GoFeatureFlagProviderOptionsBuilder builder = GoFeatureFlagProviderOptions.builder();
 
         builder.endpoint(endpoint);
 
-        return builder.build();
+        GoFeatureFlagProviderOptions options = builder.build();
+        options.validate();
+        return options;
     }
 
 }

src/main/java/io/github/sideshowcoder/dropwizard_openfeature/OpenFeatureBundle.java

@@ -2,6 +2,7 @@
 
 import dev.openfeature.contrib.providers.flagd.FlagdProvider;
 import dev.openfeature.contrib.providers.gofeatureflag.GoFeatureFlagProvider;
+import dev.openfeature.contrib.providers.gofeatureflag.GoFeatureFlagProviderOptions;
 import dev.openfeature.contrib.providers.gofeatureflag.exception.InvalidOptions;
 import dev.openfeature.sdk.Client;
 import dev.openfeature.sdk.FeatureProvider;

src/test/java/io/github/sideshowcoder/dropwizard_openfeature/OpenFeatureBundleGoFeatureFlagProviderTest.java

@@ -3,6 +3,8 @@
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import java.util.List;
+
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.testcontainers.containers.GenericContainer;
@@ -15,6 +17,8 @@
 import com.codahale.metrics.health.HealthCheck;
 
 import dev.openfeature.sdk.Client;
+import dev.openfeature.sdk.EvaluationContext;
+import dev.openfeature.sdk.ImmutableContext;
 import dev.openfeature.sdk.OpenFeatureAPI;
 import io.dropwizard.testing.ResourceHelpers;
 import io.dropwizard.testing.junit5.DropwizardAppExtension;
@@ -27,17 +31,18 @@
 public class OpenFeatureBundleGoFeatureFlagProviderTest {
 
     @Container
-    public GenericContainer goFeatureFlagRelay = new GenericContainer<>(DockerImageName.parse("gofeatureflag/go-feature-flag:latest"))
-        .withExposedPorts(1031)
-        .withCopyFileToContainer(MountableFile.forClasspathResource("goff-proxy.yaml"), "/goff/goff-proxy.yaml")
-        .withCopyFileToContainer(MountableFile.forClasspathResource("go-feature-flags-flags.yaml"), "/goff/flags.yaml")
-        .waitingFor(Wait.forHttp("/health"));
-
-    // TODO need to start container before dropwizard app! Need to bundle it in some kind of @BeforeAll or something to start the dropwizard app.
-    // TODO start the gofeatureflag/go-feature-flag:latest docker image which is the relay proxy to interact with the provider https://gofeatureflag.org/docs/relay-proxy/getting_started
-    // TODO set endpoint to the endpoint provider via the docker container
-    // TODO create class to parse the configuration options see https://gofeatureflag.org/docs/relay-proxy/getting_started for available options
-    // TODO how can I make this work on github? Can I start docker containers there?
+    private static GenericContainer<?> goFeatureFlagRelay = createGoFeatureFlagContainer();
+
+    private static GenericContainer<?> createGoFeatureFlagContainer() {
+        GenericContainer<?> container = new GenericContainer<>(DockerImageName.parse("gofeatureflag/go-feature-flag:latest"))
+            .withCopyFileToContainer(MountableFile.forClasspathResource("goff-proxy.yaml"), "/goff/goff-proxy.yaml")
+            .withCopyFileToContainer(MountableFile.forClasspathResource("go-feature-flags-flags.yaml"), "/goff/flags.yaml");
+
+        container.setPortBindings(List.of("1031:1031"));
+        container.waitingFor(Wait.forHttp("/health"));
+
+        return container;
+    }
 
     private static final DropwizardAppExtension<Config> APP = new DropwizardAppExtension<>(
         App.class,
@@ -53,6 +58,8 @@ public void initializesHealthCheck() throws Exception {
     @Test
     public void providesFeatureFlagsViaInMemoryProvider() throws Exception {
         Client client = OpenFeatureAPI.getInstance().getClient("go-feature-flag-client");
-        assertEquals("red", client.getStringValue("staticstringflag", "not-expected-value"));
+        // GoFeatureFlags requires a target key for all queries!
+        EvaluationContext ctx = new ImmutableContext("target");
+        assertEquals("red", client.getStringValue("staticstringflag", "not-expected-value", ctx));
     }
 }