Danny Tuppeny
a65067fb9d
While reviewing logs for flaky DAP tests, I found that these tests have been failing sometimes with errors that look like the isolate might not have paused on the `debugger()` call yet: ``` evaluateInFrame: (113) Expression compilation error _buildExpressionEvaluationScope: invalid 'frameIndex' parameter: 0 ``` and ``` evaluateInFrame: (113) Expression compilation error org-dartlang-debug:synthetic_debug_expression:1:1: Error: Undefined name 'myInstance'. myInstance ^^^^^^^^^^ ``` This waits for the isolate to be paused, not just runnable, which I think might fix this. Change-Id: Ib1d6b1c44a7ef93452065aa43c4d05058914db28 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/395302 Reviewed-by: Derek Xu <derekx@google.com> Reviewed-by: Ben Konyi <bkonyi@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 preferable or required to communicate with DDS using server-sent events (SSE). DDS has an 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());
}