// Copyright 2015 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 "sql/connection_memory_dump_provider.h"

#include "base/strings/stringprintf.h"
#include "base/trace_event/process_memory_dump.h"
#include "third_party/sqlite/sqlite3.h"

namespace sql {

ConnectionMemoryDumpProvider::ConnectionMemoryDumpProvider(
    sqlite3* db,
    const std::string& name)
    : db_(db), connection_name_(name) {}

ConnectionMemoryDumpProvider::~ConnectionMemoryDumpProvider() {}

void ConnectionMemoryDumpProvider::ResetDatabase() {
  base::AutoLock lock(lock_);
  db_ = nullptr;
}

bool ConnectionMemoryDumpProvider::OnMemoryDump(
    const base::trace_event::MemoryDumpArgs& args,
    base::trace_event::ProcessMemoryDump* pmd) {
  if (args.level_of_detail == base::trace_event::MemoryDumpLevelOfDetail::LIGHT)
    return true;

  int cache_size = 0;
  int schema_size = 0;
  int statement_size = 0;
  {
    // Lock is acquired here so that db_ is not reset in ResetDatabase when
    // collecting stats.
    base::AutoLock lock(lock_);
    if (!db_) {
      return false;
    }

    // The high water mark is not tracked for the following usages.
    int dummy_int;
    int status = sqlite3_db_status(db_, SQLITE_DBSTATUS_CACHE_USED, &cache_size,
                                   &dummy_int, 0 /* resetFlag */);
    DCHECK_EQ(SQLITE_OK, status);
    status = sqlite3_db_status(db_, SQLITE_DBSTATUS_SCHEMA_USED, &schema_size,
                               &dummy_int, 0 /* resetFlag */);
    DCHECK_EQ(SQLITE_OK, status);
    status = sqlite3_db_status(db_, SQLITE_DBSTATUS_STMT_USED, &statement_size,
                               &dummy_int, 0 /* resetFlag */);
    DCHECK_EQ(SQLITE_OK, status);
  }

  std::string name = base::StringPrintf(
      "sqlite/%s_connection/%p",
      connection_name_.empty() ? "Unknown" : connection_name_.c_str(), this);
  base::trace_event::MemoryAllocatorDump* dump = pmd->CreateAllocatorDump(name);
  dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
                  base::trace_event::MemoryAllocatorDump::kUnitsBytes,
                  cache_size + schema_size + statement_size);
  dump->AddScalar("cache_size",
                  base::trace_event::MemoryAllocatorDump::kUnitsBytes,
                  cache_size);
  dump->AddScalar("schema_size",
                  base::trace_event::MemoryAllocatorDump::kUnitsBytes,
                  schema_size);
  dump->AddScalar("statement_size",
                  base::trace_event::MemoryAllocatorDump::kUnitsBytes,
                  statement_size);
  return true;
}

}  // namespace sql