Nate Bosch
64ebe56f5f
Previously when a process emits unexpected content on `stdout` during startup the `FormatException` was not useful, it would look something like: ``` FormatException: Invalid value in input: 226 dart:convert AsciiCodec.decode package:dds/src/dap/protocol_stream_transformers.dart 91:28 PacketTransformer._parseHeaders package:dds/src/dap/protocol_stream_transformers.dart 40:25 PacketTransformer.bind.<fn>.<fn> ``` When the failure comes form the ascii decode, give another attempt at decoding with utf8 since that is a common character set for tool output. Use that in the message for the exception to make it more useful for the reader. Now the failure will look like: ``` FormatException: Unable to decode headers with ascii. The stream has utf8 content: Downloading package sky_engine... 472ms Downloading flutter_patched_sdk tools... 629ms Downloading flutter_patched_sdk_product tools... 615ms Downloading linux-x64 tools... 1,782ms Downloading linux-x64/font-subset tools... 237ms ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Warning ────────────────────────────────────────────────────────────────────────────── Your Flutter application is created using an older version of the Android embedding. It is being deprecated in favor of Android embedding v2. Follow the steps at https://flutter.dev/go/android-project-migration to migrate your project. You may also pass the --ignore-deprecation flag to ignore this check and continue with the deprecated v1 embedding. However, the v1 Android embedding will be removed in future versions of Flutter. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Content-Length: 518 Content-Type: application/vscode-jsonrpc; charset=utf-8 package:dds/src/dap/protocol_stream_transformers.dart 95:7 PacketTransformer._parseHeaders package:dds/src/dap/protocol_stream_transformers.dart 40:25 PacketTransformer.bind.<fn>.<fn> ``` Change-Id: I73dcd2e3de53c4af63ddfa0032a171f311be22d5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/221221 Auto-Submit: Nate Bosch <nbosch@google.com> Commit-Queue: Ben Konyi <bkonyi@google.com> Reviewed-by: 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());
}