feat: make region provider chain accept list of region providers (#1010)

Author: 0marperez

.changes/bcac069f-17fa-45ec-aa1e-e392a4c99042.json

@@ -0,0 +1,8 @@
+{
+    "id": "bcac069f-17fa-45ec-aa1e-e392a4c99042",
+    "type": "feature",
+    "description": "Make RegionProviderChain accept a list of RegionProvider",
+    "issues": [
+        "awslabs/aws-sdk-kotlin#1004"
+    ]
+}

aws-runtime/aws-config/api/aws-config.api

@@ -1665,6 +1665,7 @@ public abstract interface class aws/sdk/kotlin/runtime/region/RegionProvider {
 }
 
 public class aws/sdk/kotlin/runtime/region/RegionProviderChain : aws/sdk/kotlin/runtime/region/RegionProvider {
+	public fun <init> (Ljava/util/List;)V
 	public fun <init> ([Laws/sdk/kotlin/runtime/region/RegionProvider;)V
 	protected final fun getProviders ()[Laws/sdk/kotlin/runtime/region/RegionProvider;
 	public fun getRegion (Lkotlin/coroutines/Continuation;)Ljava/lang/Object;

aws-runtime/aws-config/common/src/aws/sdk/kotlin/runtime/region/RegionProviderChain.kt

@@ -19,6 +19,8 @@ public open class RegionProviderChain(
     protected vararg val providers: RegionProvider,
 ) : RegionProvider {
 
+    public constructor(providers: List<RegionProvider>) : this(*providers.toTypedArray())
+
     private val resolvedRegion = asyncLazy(::resolveRegion)
 
     init {

aws-runtime/aws-config/common/test/aws/sdk/kotlin/runtime/region/AwsRegionProviderChainTest.kt

@@ -33,4 +33,17 @@ class AwsRegionProviderChainTest {
 
         assertEquals("us-east-1", chain.getRegion())
     }
+
+    @Test
+    fun testChainList() = runTest {
+        val providers = listOf<RegionProvider>(
+            TestProvider(null),
+            TestProvider("us-east-1"),
+            TestProvider("us-east-2"),
+        )
+
+        val chain = RegionProviderChain(providers)
+
+        assertEquals("us-east-1", chain.getRegion())
+    }
 }