Changing minidump process generation to be in-process on Android.

chrome/browser/android/crash_dump_manager.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/android/crash_dump_manager.h"
+
+#include <inttypes.h>
+
+#include "base/bind.h"
+#include "base/file_util.h"
+#include "base/global_descriptors_posix.h"
+#include "base/logging.h"
+#include "base/path_service.h"
+#include "base/process.h"
+#include "base/rand_util.h"
+#include "base/stringprintf.h"
+#include "chrome/common/chrome_paths.h"
+#include "chrome/common/descriptors_android.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/file_descriptor_info.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_types.h"
+#include "content/public/browser/render_process_host.h"
+
+using content::BrowserThread;
+
+CrashDumpManager::CrashDumpManager() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  notification_registrar_.Add(this,
+                              content::NOTIFICATION_RENDERER_PROCESS_CREATED,
+                              content::NotificationService::AllSources());
+  notification_registrar_.Add(this,
+                              content::NOTIFICATION_RENDERER_PROCESS_CLOSED,
+                              content::NotificationService::AllSources());
+}
+
+CrashDumpManager::~CrashDumpManager() {
+}
+
+int CrashDumpManager::CreateMinidumpFile() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::PROCESS_LAUNCHER));
+  FilePath minidump_path;
+  if (!file_util::CreateTemporaryFile(&minidump_path))
+    return base::kInvalidPlatformFileValue;
+
+  base::PlatformFileError error;
+  // We need read permission as the minidump is generated in several phases
+  // and needs to be read at some point.
+  int flags = base::PLATFORM_FILE_OPEN | base::PLATFORM_FILE_READ |
+      base::PLATFORM_FILE_WRITE;
+  base::PlatformFile f =
+      base::CreatePlatformFile(minidump_path, flags, NULL, &error);
+  if (f == base::kInvalidPlatformFileValue) {
+    LOG(ERROR) << "Failed to create temporary file, crash won't be reported.";
+    return base::kInvalidPlatformFileValue;
+  }
+
+  // Associate that file descriptor with its path, we'll need the path when the
+  // process terminates.
+  {
+    // WARNING: the UI process may be blocked on this lock. We should release as
+    // soon as possible and cannot do any IO from here.
+    base::AutoLock auto_lock(file_to_path_lock_);
+    file_to_path_[f] = minidump_path;
+  }
+
+  return f;
+}
+
+void CrashDumpManager::ProcessMinidump(const MinidumpInfo& minidump) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  // Close the file descriptor, it is still open.
+  bool r = base::ClosePlatformFile(minidump.file);
+  DCHECK(r) << "Failed to close minidump file descriptor.";
+
+  int64 file_size = 0;
+  r = file_util::GetFileSize(minidump.path, &file_size);
+  DCHECK(r) << "Failed to retrieve size for minidump " <<
+      minidump.path.value();
+
+  if (file_size == 0) {
+    // Empty minidump, this process did not crash. Just remove the file.
+    r = file_util::Delete(minidump.path, false);
+    DCHECK(r) << "Failed to delete temporary minidump file " <<
+        minidump.path.value();
+    return;
+  }
+
+  // We are dealing with a valid minidump. Copy it to the crash report
+  // directory from where Java code will upload it later on.
+  FilePath crash_dump_dir;
+  r = PathService::Get(chrome::DIR_CRASH_DUMPS, &crash_dump_dir);
+  if (!r) {
+    NOTREACHED() << "Failed to retrieve the crash dump directory.";
+    return;
+  }
+
+  const uint64 rand = base::RandUint64();
+  const std::string filename =
+      base::StringPrintf("chromium-renderer-minidump-%016" PRIx64 ".dmp%d",
+                         rand, minidump.pid);
+  FilePath dest_path = crash_dump_dir.Append(filename);
+  r = file_util::Move(minidump.path, dest_path);
+  if (!r) {
+    LOG(ERROR) << "Failed to move crash dump from " << minidump.path.value() <<
+      " to " << dest_path.value();
+    file_util::Delete(minidump.path, false);
+    return;
+  }
+  LOG(INFO) << "Crash minidump successfully generated: " <<
+      crash_dump_dir.Append(filename).value();
+}
+
+void CrashDumpManager::Observe(int type,
+                               const content::NotificationSource& source,
+                               const content::NotificationDetails& details) {
+  switch (type) {
+    case content::NOTIFICATION_RENDERER_PROCESS_CREATED: {
+      content::RenderProcessHost* rph =
+          content::Source<content::RenderProcessHost>(source).ptr();
+      base::PlatformFile minidump_fd = base::kInvalidPlatformFileValue;
+      const content::FDInfoList* mapped_files =
+          content::Details<content::FDInfoList>(details).ptr();
+      for (content::FDInfoList::const_iterator iter = mapped_files->begin();
+           iter != mapped_files->end(); ++iter) {
+        if (iter->id == kAndroidMinidumpDescriptor) {
+          minidump_fd = iter->fd.fd;
+          break;
+        }
+      }
+
+      FilePath minidump_path;
+      {
+        base::AutoLock auto_lock(file_to_path_lock_);
+        FileToPath::iterator iter = file_to_path_.find(minidump_fd);
+        if (iter == file_to_path_.end()) {
+          LOG(ERROR) << "Failed to find the path of minidump FD.";
+          return;
+        }
+        minidump_path = iter->second;
+        file_to_path_.erase(iter);
+      }
+      MinidumpInfo minidump_info;
+      minidump_info.file = minidump_fd;
+      minidump_info.path = minidump_path;
+      base::Process child_process(rph->GetHandle());
+      minidump_info.pid = child_process.pid();
+      rph_to_minidump_info_[rph] = minidump_info;
+      break;
+    }
+    case content::NOTIFICATION_RENDERER_PROCESS_CLOSED: {
+      content::RenderProcessHost* rph =
+          content::Source<content::RenderProcessHost>(source).ptr();
+      RPHToMinidumpInfo::iterator iter = rph_to_minidump_info_.find(rph);
+      if (iter == rph_to_minidump_info_.end()) {
+        LOG(ERROR) << "Minidump not found for closed process.";
+        return;
+      }
+      BrowserThread::PostTask(
+          BrowserThread::IO, FROM_HERE,
+          base::Bind(&ProcessMinidump, iter->second));
+      rph_to_minidump_info_.erase(iter);
+      break;
+    }
+    default:
+      NOTREACHED();
+      break;
+  }
+}