simolus3

Analyzer plugins - tips and tricks

Debugging

Analyzer plugins run in a processes started and managed by the analysis server. This is useful when shipping plugins to users, but unfortunate for us as we can't attach a debugger to the plugin process.

Luckily, we can use a little trick to help us here. For debugging purposes, we instead use the following model. The actual plugin will start a websocket server. When the proxy loaded by the analysis server gets started, it will connect to that server and relay all operations. In fact, almost no code changes are necessary to the plugin.

simolus3

Moor: Sent CREATE TABLE IF NOT EXISTS blood_sugars (id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, value INTEGER NOT NULL, date INTEGER NOT NULL, type VARCHAR NOT NULL); with args []
Moor: Sent INSERT INTO blood_sugars (id, value, date, type) VALUES (?, ?, ?, ?) with args [2, 13, 1578779185, some type]
Moor: Sent SELECT * FROM blood_sugars WHERE (CAST(strftime("%Y", date, "unixepoch") AS INTEGER)) = ? AND (CAST(strftime("%m", date, "unixepoch") AS INTEGER)) = ? AND (CAST(strftime("%d", date, "unixepoch") AS INTEGER)) = ?; with args [2020, 1, 11]
[BloodSugar(id: 2, value: 13, date: 2020-01-11 22:46:25.000, type: some type)]

simolus3

import 'dart:math';
import 'dart:typed_data';

import 'package:benchmark_harness/benchmark_harness.dart';

const length = 1000000;
final inputs = Int64List(length);

class WithLog extends BenchmarkBase {
  WithLog() : super('log');

simolus3

import 'package:moor_ffi/database.dart';

void main() {
  final db = Database.memory();

  db.execute('''
CREATE TABLE ravs(
  id INTEGER NOT NULL PRIMARY KEY,
  originalId INTEGER NOT NULL,
  sourceId INTEGER NOT NULL,

simolus3

import 'dart:math';
import 'dart:async';
import 'dart:typed_data';

const _int32Length = 32 ~/ 8;
final _encodeInts = ByteData(_int32Length);

extension ReadLengthPrefixed on Stream<List<int>> {
  // Note: Assumes that length bytes aren't splitted across multiple packets
  Stream<Uint8List> transformLengthPrefixed() async* {

simolus3

import 'dart:async';
import 'dart:ffi';
import 'dart:io';
import 'dart:math';

import 'package:moor/backends.dart';
import 'package:moor/moor.dart';
import 'package:moor_ffi/moor_ffi.dart';
import 'package:moor_ffi/open_helper.dart';

simolus3

IntelliJ

Open a build.yaml file and click on "No JSON schema" in the bottom toolbar (at the right). Click on "New schema mapping" and fill in the options:

• Name: build.yaml, or what you prefer
• Schema file or URL: https://simonbinder.eu/schema.json
• Schema version: JSON schema version 7
• The file pattern should be build.yaml and optionally *.build.yaml

simolus3

{
  "$schema": "http://json-schema.org/draft-07/schema",
  "$id": "http://json.schemastore.org/dart_test",
  "title": "dart_test.yaml",
  "description": "Configuration for Dart tests",
  "definitions": {
    "timeout": {
      "$comment": "Based on https://github.com/dart-lang/test/blob/3b8d3b90efd24f55f7316cd414716d1cb031761c/pkgs/test_api/lib/src/frontend/timeout.dart#L55-L68",
      "oneOf": [
        {

simolus3

import 'package:analyzer/dart/analysis/analysis_context_collection.dart';
import 'package:analyzer/dart/analysis/results.dart';
import 'package:analyzer/dart/element/element.dart';
import 'package:path/path.dart';

// Usage: dart tool/why_imported.dart path/to/entrypoint.dart
void main(List<String> args) async {
  final collection = AnalysisContextCollection(includedPaths: [current]);
  final entrypoint = args.single;

simolus3

import 'dart:convert';
import 'dart:math';
import 'dart:typed_data';

/// A pure-Dart implementation of the ChaCha20 algorithm as specified by RFC
/// 7539.
///
/// To encrypt or decrypt a full message, call [encrypt] or [decrypt].
/// This codec supports an optimized, memory-efficient conversion of streaming
/// data as well: