Future _compileDart2js()

in lib/src/common_server_impl.dart [183:241]
53 lines of code
8 McCabe index (conditional complexity)

  Future<proto.CompileResponse> _compileDart2js(
    String source, {
    bool returnSourceMap = false,
  }) async {
    try {
      final sourceHash = _hashSource(source);
      final memCacheKey = '%%COMPILE:v0'
          ':returnSourceMap:$returnSourceMap:source:$sourceHash';

      final result = await _checkCache(memCacheKey);
      if (result != null) {
        log.info('CACHE: Cache hit for compileDart2js');
        final resultObj = json.decode(result) as Map<String, dynamic>;
        final response = proto.CompileResponse()
          ..result = resultObj['compiledJS'] as String;
        if (resultObj['sourceMap'] != null) {
          response.sourceMap = resultObj['sourceMap'] as String;
        }
        return response;
      }

      log.info('CACHE: MISS for compileDart2js');
      final watch = Stopwatch()..start();

      final results =
          await _compiler.compile(source, returnSourceMap: returnSourceMap);

      if (results.hasOutput) {
        final lineCount = source.split('\n').length;
        final outputSize = (results.compiledJS?.length ?? 0 / 1024).ceil();
        final ms = watch.elapsedMilliseconds;
        log.info('PERF: Compiled $lineCount lines of Dart into '
            '${outputSize}kb of JavaScript in ${ms}ms using dart2js.');
        final sourceMap = returnSourceMap ? results.sourceMap : null;

        final cachedResult = const JsonEncoder().convert(<String, String?>{
          'compiledJS': results.compiledJS,
          'sourceMap': sourceMap,
        });
        // Don't block on cache set.
        unawaited(_setCache(memCacheKey, cachedResult));
        final compileResponse = proto.CompileResponse();
        compileResponse.result = results.compiledJS ?? '';
        if (sourceMap != null) {
          compileResponse.sourceMap = sourceMap;
        }
        return compileResponse;
      } else {
        final problems = results.problems;
        final errors = problems.map(_printCompileProblem).join('\n');
        throw BadRequest(errors);
      }
    } catch (e, st) {
      if (e is! BadRequest) {
        log.severe('Error during compile (dart2js) on "$source"', e, st);
      }
      rethrow;
    }
  }