feat: add process.takeHeapSnapshot() / webContents.takeHeapSnapshot() (#14456)

atom/common/api/api_messages.h

@@ -10,6 +10,7 @@
 #include "content/public/common/common_param_traits.h"
 #include "content/public/common/referrer.h"
 #include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_platform_file.h"
 #include "ui/gfx/geometry/rect_f.h"
 #include "ui/gfx/ipc/gfx_param_traits.h"
 #include "url/gurl.h"
@@ -76,3 +77,7 @@ IPC_SYNC_MESSAGE_ROUTED0_1(AtomFrameHostMsg_GetZoomLevel, double /* result */)
 IPC_MESSAGE_ROUTED2(AtomFrameHostMsg_PDFSaveURLAs,
                     GURL /* url */,
                     content::Referrer /* referrer */)
+
+IPC_MESSAGE_ROUTED2(AtomFrameMsg_TakeHeapSnapshot,
+                    IPC::PlatformFileForTransit /* file_handle */,
+                    std::string /* channel */)

atom/common/api/atom_bindings.cc

@@ -11,12 +11,15 @@
 #include "atom/common/api/locker.h"
 #include "atom/common/atom_version.h"
 #include "atom/common/chrome_version.h"
+#include "atom/common/heap_snapshot.h"
+#include "atom/common/native_mate_converters/file_path_converter.h"
 #include "atom/common/native_mate_converters/string16_converter.h"
 #include "atom/common/node_includes.h"
 #include "base/logging.h"
 #include "base/process/process_info.h"
 #include "base/process/process_metrics_iocounters.h"
 #include "base/sys_info.h"
+#include "base/threading/thread_restrictions.h"
 #include "native_mate/dictionary.h"
 
 namespace atom {
@@ -60,6 +63,7 @@ void AtomBindings::BindTo(v8::Isolate* isolate, v8::Local<v8::Object> process) {
   dict.SetMethod("getCPUUsage", base::Bind(&AtomBindings::GetCPUUsage,
                                            base::Unretained(metrics_.get())));
   dict.SetMethod("getIOCounters", &GetIOCounters);
+  dict.SetMethod("takeHeapSnapshot", &TakeHeapSnapshot);
 #if defined(OS_POSIX)
   dict.SetMethod("setFdLimit", &base::SetFdLimit);
 #endif
@@ -238,4 +242,15 @@ v8::Local<v8::Value> AtomBindings::GetIOCounters(v8::Isolate* isolate) {
   return dict.GetHandle();
 }
 
+// static
+bool AtomBindings::TakeHeapSnapshot(v8::Isolate* isolate,
+                                    const base::FilePath& file_path) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
+
+  base::File file(file_path,
+                  base::File::FLAG_CREATE_ALWAYS | base::File::FLAG_WRITE);
+
+  return atom::TakeHeapSnapshot(isolate, &file);
+}
+
 }  // namespace atom

atom/common/api/atom_bindings.h

@@ -8,6 +8,7 @@
 #include <list>
 #include <memory>
 
+#include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/process/process_metrics.h"
 #include "base/strings/string16.h"
@@ -43,6 +44,8 @@ class AtomBindings {
   static v8::Local<v8::Value> GetCPUUsage(base::ProcessMetrics* metrics,
                                           v8::Isolate* isolate);
   static v8::Local<v8::Value> GetIOCounters(v8::Isolate* isolate);
+  static bool TakeHeapSnapshot(v8::Isolate* isolate,
+                               const base::FilePath& file_path);
 
  private:
   void ActivateUVLoop(v8::Isolate* isolate);

atom/common/heap_snapshot.cc

@@ -0,0 +1,56 @@
+// Copyright (c) 2018 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/common/heap_snapshot.h"
+
+#include "v8/include/v8-profiler.h"
+
+namespace {
+
+class HeapSnapshotOutputStream : public v8::OutputStream {
+ public:
+  explicit HeapSnapshotOutputStream(base::File* file) : file_(file) {
+    DCHECK(file_);
+  }
+
+  bool IsComplete() const { return is_complete_; }
+
+  // v8::OutputStream
+  int GetChunkSize() override { return 65536; }
+  void EndOfStream() override { is_complete_ = true; }
+
+  v8::OutputStream::WriteResult WriteAsciiChunk(char* data, int size) override {
+    auto bytes_written = file_->WriteAtCurrentPos(data, size);
+    return bytes_written == size ? kContinue : kAbort;
+  }
+
+ private:
+  base::File* file_ = nullptr;
+  bool is_complete_ = false;
+};
+
+}  // namespace
+
+namespace atom {
+
+bool TakeHeapSnapshot(v8::Isolate* isolate, base::File* file) {
+  DCHECK(isolate);
+  DCHECK(file);
+
+  if (!file->IsValid())
+    return false;
+
+  auto* snapshot = isolate->GetHeapProfiler()->TakeHeapSnapshot();
+  if (!snapshot)
+    return false;
+
+  HeapSnapshotOutputStream stream(file);
+  snapshot->Serialize(&stream, v8::HeapSnapshot::kJSON);
+
+  const_cast<v8::HeapSnapshot*>(snapshot)->Delete();
+
+  return stream.IsComplete();
+}
+
+}  // namespace atom

atom/common/heap_snapshot.h

@@ -0,0 +1,17 @@
+// Copyright (c) 2018 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_COMMON_HEAP_SNAPSHOT_H_
+#define ATOM_COMMON_HEAP_SNAPSHOT_H_
+
+#include "base/files/file.h"
+#include "v8/include/v8.h"
+
+namespace atom {
+
+bool TakeHeapSnapshot(v8::Isolate* isolate, base::File* file);
+
+}  // namespace atom
+
+#endif  // ATOM_COMMON_HEAP_SNAPSHOT_H_