Set user-visible machine names and devices types for synced sessions.

chrome/browser/sync/glue/session_model_associator.cc

Index: chrome/browser/sync/glue/session_model_associator.cc
diff --git a/chrome/browser/sync/glue/session_model_associator.cc b/chrome/browser/sync/glue/session_model_associator.cc
index ea4eee306bb0bbd0728373c23140fc6cdd5311fd..111f90cd12d324f4a4e1d8a17069d6e31bd54010 100644
--- a/chrome/browser/sync/glue/session_model_associator.cc
+++ b/chrome/browser/sync/glue/session_model_associator.cc
@@ -9,10 +9,13 @@
 #include <utility>
 
 #include "base/logging.h"
+#include "base/sys_info.h"
 #include "base/tracked.h"
+#include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/session_service_factory.h"
 #include "chrome/browser/sync/api/sync_error.h"
+#include "chrome/browser/sync/glue/synced_session.h"
 #include "chrome/browser/sync/glue/synced_tab_delegate.h"
 #include "chrome/browser/sync/glue/synced_window_delegate.h"
 #include "chrome/browser/sync/internal_api/read_node.h"
@@ -26,6 +29,11 @@
 #include "content/browser/tab_contents/navigation_entry.h"
 #include "content/common/notification_details.h"
 #include "content/common/notification_service.h"
+#if defined(OS_LINUX)
+#include "base/linux_util.h"
+#elif defined(OS_WIN)
+#include <windows.h>
+#endif
 
 namespace browser_sync {
 
@@ -123,6 +131,18 @@ void SessionModelAssociator::ReassociateWindows(bool reload_tabs) {
   sync_pb::SessionHeader* header_s = specifics.mutable_header();
   SyncedSession* current_session =
       synced_session_tracker_.GetSession(local_tag);
+  header_s->set_client_name(current_session_name_);
+#if defined(OS_LINUX)
+  header_s->set_device_type(sync_pb::SessionHeader_DeviceType_TYPE_LINUX);
+#elif defined(OS_MACOSX)
+  header_s->set_device_type(sync_pb::SessionHeader_DeviceType_TYPE_MAC);
+#elif defined(OS_WIN)
+  header_s->set_device_type(sync_pb::SessionHeader_DeviceType_TYPE_WIN);
+#elif defined(OS_CHROMEOS)
+  header_s->set_device_type(sync_pb::SessionHeader_DeviceType_TYPE_CROS);
+#else
+  header_s->set_device_type(sync_pb::SessionHeader_DeviceType_TYPE_OTHER);
+#endif
 
   size_t window_num = 0;
   std::set<SyncedWindowDelegate*> windows =
@@ -427,8 +447,13 @@ bool SessionModelAssociator::AssociateModels(SyncError* error) {
     }
 
     // Make sure we have a machine tag.
-    if (current_machine_tag_.empty())
+    if (current_machine_tag_.empty()) {
       InitializeCurrentMachineTag(&trans);
+      // The session name is retrieved asynchronously so it might not come back
+      // for the writing of the session. However, we write to the session often
+      // enough (on every navigation) that we'll pick it up quickly.
+      InitializeCurrentSessionName();
+    }
     synced_session_tracker_.SetLocalSessionTag(current_machine_tag_);
     if (!UpdateAssociationsFromSyncModel(root, &trans)) {
       error->Reset(FROM_HERE,
@@ -466,6 +491,8 @@ bool SessionModelAssociator::DisassociateModels(SyncError* error) {
   tab_map_.clear();
   tab_pool_.clear();
   local_session_syncid_ = sync_api::kInvalidId;
+  current_machine_tag_ = "";
+  current_session_name_ = "";
 
   // There is no local model stored with which to disassociate, just notify
   // foreign session handlers.
@@ -480,19 +507,64 @@ void SessionModelAssociator::InitializeCurrentMachineTag(
     sync_api::WriteTransaction* trans) {
   DCHECK(CalledOnValidThread());
   syncable::Directory* dir = trans->GetWrappedWriteTrans()->directory();
-
-  // TODO(zea): We need a better way of creating a machine tag. The directory
-  // kernel's cache_guid changes every time syncing is turned on and off. This
-  // will result in session's associated with stale machine tags persisting on
-  // the server since that tag will not be reused. Eventually this should
-  // become some string identifiable to the user. (Home, Work, Laptop, etc.)
-  // See issue at http://crbug.com/59672
   current_machine_tag_ = "session_sync";
   current_machine_tag_.append(dir->cache_guid());
   VLOG(1) << "Creating machine tag: " << current_machine_tag_;
   tab_pool_.set_machine_tag(current_machine_tag_);
 }
 
+void SessionModelAssociator::OnSessionNameInitialized(const std::string name) {
+  DCHECK(CalledOnValidThread());
+  // Only use the default machine name if it hasn't already been set.
+  if (current_session_name_.empty()) {
+    current_session_name_ = name;
+  }
+}
+
+// Task which runs on the file thread because it runs system calls which can
+// block while retrieving sytem information.
+class GetSessionNameTask : public Task {
+ public:
+  explicit GetSessionNameTask(
+      const WeakHandle<SessionModelAssociator> associator) :
+    associator_(associator) {}
+
+  virtual void Run() {
+#if defined(OS_LINUX)
+    std::string session_name = base::GetLinuxDistro();
+#elif defined(OS_MACOSX)
+    std::string session_name = SessionModelAssociator::GetHardwareModelName();
+#elif defined(OS_WIN)
+    std::string session_name = SessionModelAssociator::GetComputerName();
+#else
+    std::string session_name;
+#endif
+    if (session_name == "Unknown" || session_name.empty()) {
+      session_name = base::SysInfo::OperatingSystemName();
+    }
+    associator_.Call(FROM_HERE,
+                     &SessionModelAssociator::OnSessionNameInitialized,
+                     session_name);
+  }
+  const WeakHandle<SessionModelAssociator> associator_;
+
+  DISALLOW_COPY_AND_ASSIGN(GetSessionNameTask);
+};
+
+void SessionModelAssociator::InitializeCurrentSessionName() {
+  DCHECK(CalledOnValidThread());
+  if (setup_for_test_) {
+    OnSessionNameInitialized("TestSessionName");
+  } else {
+#if defined(OS_CHROMEOS)
+    OnSessionNameInitialized("Chromebook");
+#else
+    BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
+        new GetSessionNameTask(MakeWeakHandle(AsWeakPtr())));
+#endif
+  }
+}
+
 bool SessionModelAssociator::UpdateAssociationsFromSyncModel(
     const sync_api::ReadNode& root,
     const sync_api::BaseTransaction* trans) {
@@ -522,6 +594,9 @@ bool SessionModelAssociator::UpdateAssociationsFromSyncModel(
 
         // This is our previous header node, reuse it.
         local_session_syncid_ = id;
+        if (specifics.header().has_client_name()) {
+          current_session_name_ = specifics.header().client_name();
+        }
       } else {
         if (!specifics.has_tab())
           return false;
@@ -561,6 +636,7 @@ bool SessionModelAssociator::AssociateForeignSpecifics(
         synced_session_tracker_.GetSession(foreign_session_tag);
 
     const sync_pb::SessionHeader& header = specifics.header();
+    PopulateSessionHeaderFromSpecifics(header, foreign_session);
     foreign_session->windows.reserve(header.window_size());
     VLOG(1) << "Associating " << foreign_session_tag << " with " <<
         header.window_size() << " windows.";
@@ -605,6 +681,36 @@ void SessionModelAssociator::DisassociateForeignSession(
 }
 
 // Static
+void SessionModelAssociator::PopulateSessionHeaderFromSpecifics(
+    const sync_pb::SessionHeader& header_specifics,
+    SyncedSession* session_header) {
+  if (header_specifics.has_client_name()) {
+    session_header->session_name = header_specifics.client_name();
+  }
+  if (header_specifics.has_device_type()) {
+    switch (header_specifics.device_type()) {
+      case sync_pb::SessionHeader_DeviceType_TYPE_WIN:
+        session_header->device_type = SyncedSession::TYPE_WIN;
+        break;
+      case sync_pb::SessionHeader_DeviceType_TYPE_MAC:
+        session_header->device_type = SyncedSession::TYPE_MACOSX;
+        break;
+      case sync_pb::SessionHeader_DeviceType_TYPE_LINUX:
+        session_header->device_type = SyncedSession::TYPE_LINUX;
+        break;
+      case sync_pb::SessionHeader_DeviceType_TYPE_CROS:
+        session_header->device_type = SyncedSession::TYPE_CHROMEOS;
+        break;
+      case sync_pb::SessionHeader_DeviceType_TYPE_OTHER:
+        // Intentionally fall-through
+      default:
+        session_header->device_type = SyncedSession::TYPE_OTHER;
+        break;
+    }
+  }
+}
+
+// Static
 void SessionModelAssociator::PopulateSessionWindowFromSpecifics(
     const std::string& session_tag,
     const sync_pb::SessionWindow& specifics,
@@ -1076,4 +1182,18 @@ bool SessionModelAssociator::CryptoReadyIfNecessary() {
          sync_service_->IsCryptographerReady(&trans);
 }
 
+#if defined(OS_WIN)
+// Static
+// TODO(nzea): This isn't safe to call on the UI-thread. Move it out to a util
+// or object that lives on the FILE thread.
+std::string SessionModelAssociator::GetComputerName() {
+  char computer_name[MAX_COMPUTERNAME_LENGTH + 1];
+  DWORD size = sizeof(computer_name);
+  if (GetComputerNameA(computer_name, &size)) {
+    return computer_name;
+  }
+  return std::string();
+}
+#endif
+
 }  // namespace browser_sync