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[flutter_tools] check asset files while the tool waits for the frontend_server compile (#67826)

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On every hot reload, the flutter tool must file stat each asset in the bundle. With a large number of assets or a slow file system, this can take 20 - 30 ms. Do this operation while the flutter tool is waiting for a response from the frontend_server.

No tests updated since this is only a timing update. Any difference in behavior will be shown on benchmarks
This commit is contained in:
Jonah Williams 2020-10-12 14:06:40 -07:00 committed by GitHub
parent 354e2a57b1
commit 408cd71d82
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 20 additions and 15 deletions
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35
packages/flutter_tools/lib/src/devfs.dart
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@ -499,14 +499,31 @@ class DevFS {
// Update modified files
final Map<Uri, DevFSContent> dirtyEntries = <Uri, DevFSContent>{};
int syncedBytes = 0;
if (fullRestart) {
generator.reset();
}
// On a full restart, or on an initial compile for the attach based workflow,
// this will produce a full dill. Subsequent invocations will produce incremental
// dill files that depend on the invalidated files.
_logger.printTrace('Compiling dart to kernel with ${invalidatedFiles.length} updated files');
// Await the compiler response after checking if the bundle is updated. This allows the file
// stating to be done while waiting for the frontend_server response.
final Future<CompilerOutput> pendingCompilerOutput = generator.recompile(
mainUri,
invalidatedFiles,
outputPath: dillOutputPath ?? getDefaultApplicationKernelPath(trackWidgetCreation: trackWidgetCreation),
packageConfig: packageConfig,
);
if (bundle != null) {
final String assetBuildDirPrefix = _asUriPath(getAssetBuildDirectory());
// The tool writes the assets into the AssetBundle working dir so that they
// are in the same location in DevFS and the iOS simulator.
final String assetBuildDirPrefix = _asUriPath(getAssetBuildDirectory());
final String assetDirectory = getAssetBuildDirectory();
bundle.entries.forEach((String archivePath, DevFSContent content) {
// If the content is backed by a real file, isModified will file stat and return true if
// it was modified since the last time this was called.
if (!content.isModified || bundleFirstUpload) {
return;
}
@ -521,19 +538,7 @@ class DevFS {
}
});
}
if (fullRestart) {
generator.reset();
}
// On a full restart, or on an initial compile for the attach based workflow,
// this will produce a full dill. Subsequent invocations will produce incremental
// dill files that depend on the invalidated files.
_logger.printTrace('Compiling dart to kernel with ${invalidatedFiles.length} updated files');
final CompilerOutput compilerOutput = await generator.recompile(
mainUri,
invalidatedFiles,
outputPath: dillOutputPath ?? getDefaultApplicationKernelPath(trackWidgetCreation: trackWidgetCreation),
packageConfig: packageConfig,
);
final CompilerOutput compilerOutput = await pendingCompilerOutput;
if (compilerOutput == null || compilerOutput.errorCount > 0) {
return UpdateFSReport(success: false);
}