Allow to `finish()` GRPCAsyncRequestStreamWriter sync, non-throwing (#1504)

* Add sync method variant for finishing RequestStreamWriter

* Adjust call sites to use sync RequestStreamWriter finish

* Remove async variant of GRPCAsyncRequestStreamWriter's .finish()

Co-authored-by: George Barnett <gbarnett@apple.com>

Sources/Examples/RouteGuide/Client/RouteGuideClient.swift

@@ -143,7 +143,7 @@ extension RouteGuideExample {
         }
       }
 
-      try await recordRoute.requestStream.finish()
+      recordRoute.requestStream.finish()
       let summary = try await recordRoute.response
 
       print(
@@ -188,7 +188,7 @@ extension RouteGuideExample {
             try await Task.sleep(nanoseconds: UInt64.random(in: UInt64(2e8) ... UInt64(1e9)))
           }
 
-          try await routeChat.requestStream.finish()
+          routeChat.requestStream.finish()
         }
 
         // Add a task to print each message received on the response stream.

Sources/GRPC/AsyncAwaitSupport/GRPCAsyncRequestStreamWriter.swift

@@ -86,7 +86,7 @@ public struct GRPCAsyncRequestStreamWriter<Request: Sendable>: Sendable {
   }
 
   /// Finish the request stream for the RPC. This must be called when there are no more requests to be sent.
-  public func finish() async throws {
+  public func finish() {
     self.asyncWriter.finish()
   }
 

Sources/GRPC/AsyncAwaitSupport/GRPCClient+AsyncAwaitSupport.swift

@@ -421,7 +421,7 @@ extension GRPCClient {
           for try await request in requests {
             try await call.requestStream.send(request)
           }
-          try await call.requestStream.finish()
+          call.requestStream.finish()
         } catch {
           // If we throw then cancel the call. We will rely on the response throwing an appropriate
           // error below.
@@ -452,7 +452,7 @@ extension GRPCClient {
           for try await request in requests {
             try await call.requestStream.send(request)
           }
-          try await call.requestStream.finish()
+          call.requestStream.finish()
         } onCancel: {
           call.cancel()
         }

Tests/GRPCTests/AsyncAwaitSupport/AsyncClientTests.swift

@@ -222,7 +222,7 @@ final class AsyncClientCancellationTests: GRPCTestCase {
     let collect = echo.makeCollectCall()
     // Send and close.
     try await collect.requestStream.send(.with { $0.text = "foo" })
-    try await collect.requestStream.finish()
+    collect.requestStream.finish()
 
     // Await the response and status.
     _ = try await collect.response
@@ -294,7 +294,7 @@ final class AsyncClientCancellationTests: GRPCTestCase {
     let update = echo.makeUpdateCall()
     // Send and close.
     try await update.requestStream.send(.with { $0.text = "foo" })
-    try await update.requestStream.finish()
+    update.requestStream.finish()
 
     // Await the response and status.
     let responseCount = try await update.responseStream.count()

Tests/GRPCTests/AsyncAwaitSupport/AsyncIntegrationTests.swift

@@ -82,7 +82,7 @@ final class AsyncIntegrationTests: GRPCTestCase {
     try await collect.requestStream.send(.with { $0.text = "boyle" })
     try await collect.requestStream.send(.with { $0.text = "jeffers" })
     try await collect.requestStream.send(.with { $0.text = "holt" })
-    try await collect.requestStream.finish()
+    collect.requestStream.finish()
 
     let initialMetadata = try await collect.initialMetadata
     initialMetadata.assertFirst("200", forName: ":status")
@@ -149,7 +149,7 @@ final class AsyncIntegrationTests: GRPCTestCase {
       XCTAssertEqual(response, "Swift echo update (\(i)): \(name)")
     }
 
-    try await update.requestStream.finish()
+    update.requestStream.finish()
 
     // This isn't right after we make the call as servers are not guaranteed to send metadata back
     // immediately. Concretely, we don't send initial metadata back until the first response
@@ -186,7 +186,7 @@ final class AsyncIntegrationTests: GRPCTestCase {
     _ = try await update.responseStream.first(where: { _ in true })
     XCTAssertNoThrow(try self.server.close().wait())
     self.server = nil // So that tearDown() does not call close() again.
-    try await update.requestStream.finish()
+    update.requestStream.finish()
   }
 }
 

Tests/GRPCTests/AsyncAwaitSupport/InterceptorsAsyncTests.swift

@@ -105,7 +105,7 @@ class InterceptorsAsyncTests: GRPCTestCase {
     let call = self.echo.makeCollectCall(callOptions: .init())
     try await call.requestStream.send(.with { $0.text = "1 2" })
     try await call.requestStream.send(.with { $0.text = "3 4" })
-    try await call.requestStream.finish()
+    call.requestStream.finish()
 
     await assertThat(
       try await call.response,
@@ -153,7 +153,7 @@ class InterceptorsAsyncTests: GRPCTestCase {
     let call = self.echo.makeUpdateCall(callOptions: .init())
     try await call.requestStream.send(.with { $0.text = "1 2" })
     try await call.requestStream.send(.with { $0.text = "3 4" })
-    try await call.requestStream.finish()
+    call.requestStream.finish()
 
     var count = 0
     for try await response in call.responseStream {

Tests/GRPCTests/GRPCAsyncClientCallTests.swift

@@ -98,7 +98,7 @@ class GRPCAsyncClientCallTests: GRPCTestCase {
     for word in ["boyle", "jeffers", "holt"] {
       try await collect.requestStream.send(.with { $0.text = word })
     }
-    try await collect.requestStream.finish()
+    collect.requestStream.finish()
 
     await assertThat(try await collect.initialMetadata, .is(.equalTo(Self.OKInitialMetadata)))
     await assertThat(try await collect.response, .doesNotThrow())
@@ -138,7 +138,7 @@ class GRPCAsyncClientCallTests: GRPCTestCase {
       try await update.requestStream.send(request)
     }
     try await update.requestStream.send(requests)
-    try await update.requestStream.finish()
+    update.requestStream.finish()
 
     let numResponses = try await update.responseStream.map { _ in 1 }.reduce(0, +)
 
@@ -163,7 +163,7 @@ class GRPCAsyncClientCallTests: GRPCTestCase {
       await assertThat(try await responseStreamIterator.next(), .is(.notNil()))
     }
 
-    try await update.requestStream.finish()
+    update.requestStream.finish()
 
     await assertThat(try await responseStreamIterator.next(), .is(.nil()))
 
@@ -191,7 +191,7 @@ class GRPCAsyncClientCallTests: GRPCTestCase {
           try await update.requestStream.send(.with { $0.text = word })
           await counter.incrementRequests()
         }
-        try await update.requestStream.finish()
+        update.requestStream.finish()
       }
       // Get responses in a separate task.
       taskGroup.addTask {