Ben Konyi
0950d887be
The test harness wasn't waiting on `CliAppFixture.onAppStarted` which could cause an unhandled exception if the test cleanup started before the target application finished initializing. This typically only occurred while the test was running on a machine under load. Fixes https://github.com/dart-lang/sdk/issues/48669 TEST=Locally while running under load (e.g., `stress -c 72`) Change-Id: Ieb67e46f62c33101490899440574fb57fc0f8882 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/238922 Reviewed-by: Kenzie Davisson <kenzieschmoll@google.com> Commit-Queue: Ben Konyi <bkonyi@google.com>
A package used to spawn the Dart Developer Service (DDS), which is used to communicate with a Dart VM Service instance and provide extended functionality to the core VM Service Protocol.
Functionality
Existing VM Service clients can issue both HTTP, websocket, and SSE requests to a running DDS instance as if it were an instance of the VM Service itself. If a request corresponds to an RPC defined in the VM Service Protocol, DDS will forward the request and return the response from the VM Service. Requests corresponding to an RPC defined in the DDS Protocol will be handled directly by the DDS instance.
SSE Support
For certain web clients it may be preferrable or required to communicate with DDS using server-sent events (SSE). DDS has a SSE handler listening for requests on /$debugHandler.
SSE and package:vm_service example
import 'package:sse/sse.dart';
import 'package:vm_service/vm_service.dart';
void main() {
// Establish connection with DDS using SSE.
final ddsChannel = SseClient('${ddsUri}\$debugHandler');
// Wait for ddsChannel to be established
await ddsChannel.onOpen.first;
// Initialize VmService using the sink and stream from ddsChannel.
final vmService = VmService(
ddsChannel.stream,
(e) => ddsChannel.sink.add(e),
);
// You're ready to query DDS and the VM service!
print(await vmService.getVersion());
}