Add new UMA stats to get a handle on Downloads UI Usage

chrome/browser/history/download_database.cc

 // Copyright (c) 2011 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/history/download_database.h"
 
 #include <limits>
+#include <string>
 #include <vector>
 
 #include "base/file_path.h"
 #include "base/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "content/browser/browser_thread.h"
 #include "content/browser/download/download_item.h"
 #include "content/browser/download/download_persistent_store_info.h"
 #include "sql/statement.h"
 
 // Download schema:
 //
 //   id             SQLite-generated primary key.
 //   full_path      Location of the download on disk.
 //   url            URL of the downloaded file.
 //   start_time     When the download was started.
 //   received_bytes Total size downloaded.
 //   total_bytes    Total size of the download.
 //   state          Identifies if this download is completed or not. Not used
 //                  directly by the history system. See DownloadItem's
 //                  DownloadState for where this is used.
+//   end_time       When the download completed.
+//   opened         1 if the download has ever been opened else 0
 
 namespace history {
 
 namespace {
 
 #if defined(OS_POSIX)
 
 // Binds/reads the given file path to the given column of the given statement.
 void BindFilePath(sql::Statement& statement, const FilePath& path, int col) {
   statement.BindString(col, path.value());
@@ skipping 22 matching lines @@
 
 DownloadDatabase::DownloadDatabase()
     : owning_thread_set_(false),
       owning_thread_(0),
       next_id_(0) {
 }
 
 DownloadDatabase::~DownloadDatabase() {
 }
 
+bool DownloadDatabase::EnsureColumnExists(
+    const std::string& name, const std::string& type) {
+  std::string add_col = "ALTER TABLE downloads ADD COLUMN " + name + " " + type;
+  return GetDB().DoesColumnExist("downloads", name.c_str()) ||
+         GetDB().Execute(add_col.c_str());
+}
+
 bool DownloadDatabase::InitDownloadTable() {
-  if (!GetDB().DoesTableExist("downloads")) {
-    if (!GetDB().Execute(
+  meta_table_.Init(&GetDB(), 0, 0);
+  meta_table_.GetValue(kNextDownloadId, &next_id_);
+  if (GetDB().DoesTableExist("downloads")) {
+    return EnsureColumnExists("end_time", "INTEGER NOT NULL DEFAULT 0") &&
+           EnsureColumnExists("opened", "INTEGER NOT NULL DEFAULT 0");
+  } else {
+    return GetDB().Execute(
         "CREATE TABLE downloads ("
         "id INTEGER PRIMARY KEY,"
         "full_path LONGVARCHAR NOT NULL,"
         "url LONGVARCHAR NOT NULL,"
         "start_time INTEGER NOT NULL,"
         "received_bytes INTEGER NOT NULL,"
         "total_bytes INTEGER NOT NULL,"
-        "state INTEGER NOT NULL)"))
-      return false;
+        "state INTEGER NOT NULL,"
+        "end_time INTEGER NOT NULL,"
+        "opened INTEGER NOT NULL)");
   }
-  meta_table_.Init(&GetDB(), 0, 0);
-  meta_table_.GetValue(kNextDownloadId, &next_id_);
-  return true;
 }
 
 bool DownloadDatabase::DropDownloadTable() {
   return GetDB().Execute("DROP TABLE downloads");
 }
 
 void DownloadDatabase::QueryDownloads(
     std::vector<DownloadPersistentStoreInfo>* results) {
   results->clear();
 
   sql::Statement statement(GetDB().GetCachedStatement(SQL_FROM_HERE,
       "SELECT id, full_path, url, start_time, received_bytes, "
-        "total_bytes, state "
+        "total_bytes, state, end_time, opened "
       "FROM downloads "
       "ORDER BY start_time"));
   if (!statement)
     return;
 
   while (statement.Step()) {
     DownloadPersistentStoreInfo info;
     info.db_handle = statement.ColumnInt64(0);
 
     info.path = ColumnFilePath(statement, 1);
     info.url = GURL(statement.ColumnString(2));
     info.start_time = base::Time::FromTimeT(statement.ColumnInt64(3));
     info.received_bytes = statement.ColumnInt64(4);
     info.total_bytes = statement.ColumnInt64(5);
     info.state = statement.ColumnInt(6);
+    info.end_time = base::Time::FromTimeT(statement.ColumnInt64(7));
+    info.opened = statement.ColumnInt(8) != 0;
     results->push_back(info);
   }
 }
 
-bool DownloadDatabase::UpdateDownload(int64 received_bytes,
-                                      int32 state,
-                                      DownloadID db_handle) {
-  DCHECK(db_handle > 0);
+bool DownloadDatabase::UpdateDownload(DownloadItemData data) {
+  DCHECK(data.db_handle > 0);
   sql::Statement statement(GetDB().GetCachedStatement(SQL_FROM_HERE,
       "UPDATE downloads "
-      "SET received_bytes=?, state=? WHERE id=?"));
+      "SET received_bytes=?, state=?, end_time=?, opened=? WHERE id=?"));
   if (!statement)
     return false;
 
-  statement.BindInt64(0, received_bytes);
-  statement.BindInt(1, state);
-  statement.BindInt64(2, db_handle);
+  statement.BindInt64(0, data.received_bytes);
+  statement.BindInt(1, data.state);
+  statement.BindInt64(2, data.end_time.ToTimeT());
+  statement.BindInt(3, (data.opened ? 1 : 0));
+  statement.BindInt64(4, data.db_handle);
   return statement.Run();
 }
 
 bool DownloadDatabase::UpdateDownloadPath(const FilePath& path,
                                           DownloadID db_handle) {
   DCHECK(db_handle > 0);
   sql::Statement statement(GetDB().GetCachedStatement(SQL_FROM_HERE,
       "UPDATE downloads SET full_path=? WHERE id=?"));
   if (!statement)
     return false;
@@ skipping 17 matching lines @@
     const DownloadPersistentStoreInfo& info) {
   if (owning_thread_set_) {
     CHECK_EQ(owning_thread_, base::PlatformThread::CurrentId());
   } else {
     owning_thread_ = base::PlatformThread::CurrentId();
     owning_thread_set_ = true;
   }
 
   sql::Statement statement(GetDB().GetCachedStatement(SQL_FROM_HERE,
       "INSERT INTO downloads "
-      "(full_path, url, start_time, received_bytes, total_bytes, state) "
-      "VALUES (?, ?, ?, ?, ?, ?)"));
+      "(full_path, url, start_time, received_bytes, total_bytes, state, "
+      "end_time, opened) "
+      "VALUES (?, ?, ?, ?, ?, ?, ?, ?)"));
   if (!statement)
     return 0;
 
   BindFilePath(statement, info.path, 0);
   statement.BindString(1, info.url.spec());
   statement.BindInt64(2, info.start_time.ToTimeT());
   statement.BindInt64(3, info.received_bytes);
   statement.BindInt64(4, info.total_bytes);
   statement.BindInt(5, info.state);
+  statement.BindInt64(6, info.end_time.ToTimeT());
+  statement.BindInt(7, info.opened ? 1 : 0);
 
   if (statement.Run()) {
     int64 id = GetDB().GetLastInsertRowId();
 
     CHECK_EQ(0u, returned_ids_.count(id));
     returned_ids_.insert(id);
 
     // TODO(benjhayden) if(info.id>next_id_){setvalue;next_id_=info.id;}
     meta_table_.SetValue(kNextDownloadId, ++next_id_);
 
@@ skipping 52 matching lines @@
   statement.BindInt64(
       1,
       end_time ? end_time : std::numeric_limits<int64>::max());
   statement.BindInt(2, DownloadItem::COMPLETE);
   statement.BindInt(3, DownloadItem::CANCELLED);
   statement.BindInt(4, DownloadItem::INTERRUPTED);
   statement.Run();
 }
 
 }  // namespace history