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perf: don't use JSON to send the result of ipcRenderer.sendSync. (#8953)

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* Don't use JSON to send the result of `ipcRenderer.sendSync`.

- Change the return type of AtomViewHostMsg_Message_Sync from `base::string16`
  to `base::ListValue`
- Adjust lib/browser/api/web-contents.js and /lib/renderer/api/ipc-renderer.js
  to wrap/unwrap return values to/from array, instead of
  serializing/deserializing JSON.

This change can greatly improve `ipcRenderer.sendSync` calls where the return
value contains Buffer instances, because those are converted to Array before
being serialized to JSON(which has no efficient way of representing byte
arrays).

A simple benchmark where remote.require('fs') was used to read a 16mb file got
at least 5x faster, not to mention it used a lot less memory.  This difference
tends increases with larger buffers.

* Don't base64 encode Buffers

* Don't allocate V8ValueConverter on the heap

* Replace hidden global.sandbox with NodeBindings::IsInitialized()

* Refactoring: check NodeBindings::IsInitialized() in V8ValueConverter

* Refactor problematic test to make it more reliable

* Add tests for NaN and Infinity
This commit is contained in:
Thiago de Arruda 2018-06-13 04:38:31 -03:00 • committed by Samuel Attard
parent fa1a5f2a42
commit 6ff111a141
17 changed files with 82 additions and 64 deletions
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11
atom/renderer/atom_sandboxed_renderer_client.cc
View file

@ -7,7 +7,6 @@
#include "atom/common/api/api_messages.h"
#include "atom/common/api/atom_bindings.h"
#include "atom/common/native_mate_converters/string16_converter.h"
#include "atom/common/native_mate_converters/v8_value_converter.h"
#include "atom/common/native_mate_converters/value_converter.h"
#include "atom/common/node_bindings.h"
#include "atom/common/options_switches.h"
@ -100,10 +99,7 @@ class AtomSandboxedRenderFrameObserver : public AtomRenderFrameObserver {
AtomSandboxedRenderFrameObserver(content::RenderFrame* render_frame,
AtomSandboxedRendererClient* renderer_client)
: AtomRenderFrameObserver(render_frame, renderer_client),
v8_converter_(new atom::V8ValueConverter),
renderer_client_(renderer_client) {
v8_converter_->SetDisableNode(true);
}
renderer_client_(renderer_client) {}
protected:
void EmitIPCEvent(blink::WebLocalFrame* frame,
@ -117,14 +113,13 @@ class AtomSandboxedRenderFrameObserver : public AtomRenderFrameObserver {
auto context = frame->MainWorldScriptContext();
v8::Context::Scope context_scope(context);
v8::Local<v8::Value> argv[] = {mate::ConvertToV8(isolate, channel),
v8_converter_->ToV8Value(&args, context)};
mate::ConvertToV8(isolate, args)};
renderer_client_->InvokeIpcCallback(
context, "onMessage",
std::vector<v8::Local<v8::Value>>(argv, argv + 2));
std::vector<v8::Local<v8::Value>>(argv, argv + node::arraysize(argv)));
}
private:
std::unique_ptr<atom::V8ValueConverter> v8_converter_;
AtomSandboxedRendererClient* renderer_client_;
DISALLOW_COPY_AND_ASSIGN(AtomSandboxedRenderFrameObserver);
};