storage/test/storage_test_harness.h
author Chris H-C <chutten@mozilla.com>
Mon, 04 Jul 2016 11:16:05 -0400
changeset 312997 df28918fe2361f0b54ca9ce4773a29c4c0675d06
parent 308876 b09d90288666fb3afb11877fc45527b904ef23db
permissions -rw-r--r--
bug 1218576 - Support remote accumulation via JS histograms. r=gfritzsche The JS histograms, too, need to dispatch their accumulations from child to parent. JSHistograms_Add now only supports histograms that are in gHistogramsMap or that were created in the parent process. After bug 1288745, maybe we'll be able to change this to be less convoluted. MozReview-Commit-ID: 3qTH89YKbGP

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "TestHarness.h"

#include "nsMemory.h"
#include "prthread.h"
#include "nsThreadUtils.h"
#include "nsDirectoryServiceDefs.h"
#include "mozilla/ReentrantMonitor.h"

#include "mozIStorageService.h"
#include "mozIStorageConnection.h"
#include "mozIStorageStatementCallback.h"
#include "mozIStorageCompletionCallback.h"
#include "mozIStorageBindingParamsArray.h"
#include "mozIStorageBindingParams.h"
#include "mozIStorageAsyncStatement.h"
#include "mozIStorageStatement.h"
#include "mozIStoragePendingStatement.h"
#include "mozIStorageError.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIEventTarget.h"

#include "sqlite3.h"

static int gTotalTests = 0;
static int gPassedTests = 0;

#define do_check_true(aCondition) \
  PR_BEGIN_MACRO \
    gTotalTests++; \
    if (aCondition) { \
      gPassedTests++; \
    } else { \
      fail("%s | Expected true, got false at line %d", __FILE__, __LINE__); \
    } \
  PR_END_MACRO

#define do_check_false(aCondition) \
  PR_BEGIN_MACRO \
    gTotalTests++; \
    if (!aCondition) { \
      gPassedTests++; \
    } else { \
      fail("%s | Expected false, got true at line %d", __FILE__, __LINE__); \
    } \
  PR_END_MACRO

#define do_check_success(aResult) \
  do_check_true(NS_SUCCEEDED(aResult))

#ifdef LINUX
// XXX Linux opt builds on tinderbox are orange due to linking with stdlib.
// This is sad and annoying, but it's a workaround that works.
#define do_check_eq(aExpected, aActual) \
  do_check_true(aExpected == aActual)
#else
#include <sstream>
// Print nsresult as uint32_t
std::ostream& operator<<(std::ostream& aStream, const nsresult aInput)
{
  return aStream << static_cast<uint32_t>(aInput);
}
#define do_check_eq(aExpected, aActual) \
  PR_BEGIN_MACRO \
    gTotalTests++; \
    if (aExpected == aActual) { \
      gPassedTests++; \
    } else { \
      std::ostringstream temp; \
      temp << __FILE__ << " | Expected '" << aExpected << "', got '"; \
      temp << aActual <<"' at line " << __LINE__; \
      fail(temp.str().c_str()); \
    } \
  PR_END_MACRO
#endif

#define do_check_ok(aInvoc) do_check_true((aInvoc) == SQLITE_OK)

already_AddRefed<mozIStorageService>
getService()
{
  nsCOMPtr<mozIStorageService> ss =
    do_GetService("@mozilla.org/storage/service;1");
  do_check_true(ss);
  return ss.forget();
}

already_AddRefed<mozIStorageConnection>
getMemoryDatabase()
{
  nsCOMPtr<mozIStorageService> ss = getService();
  nsCOMPtr<mozIStorageConnection> conn;
  nsresult rv = ss->OpenSpecialDatabase("memory", getter_AddRefs(conn));
  do_check_success(rv);
  return conn.forget();
}

already_AddRefed<mozIStorageConnection>
getDatabase()
{
  nsCOMPtr<nsIFile> dbFile;
  (void)NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
                               getter_AddRefs(dbFile));
  NS_ASSERTION(dbFile, "The directory doesn't exists?!");

  nsresult rv = dbFile->Append(NS_LITERAL_STRING("storage_test_db.sqlite"));
  do_check_success(rv);

  nsCOMPtr<mozIStorageService> ss = getService();
  nsCOMPtr<mozIStorageConnection> conn;
  rv = ss->OpenDatabase(dbFile, getter_AddRefs(conn));
  do_check_success(rv);
  return conn.forget();
}


class AsyncStatementSpinner : public mozIStorageStatementCallback
                            , public mozIStorageCompletionCallback
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_MOZISTORAGESTATEMENTCALLBACK
  NS_DECL_MOZISTORAGECOMPLETIONCALLBACK

  AsyncStatementSpinner();

  void SpinUntilCompleted();

  uint16_t completionReason;

protected:
  virtual ~AsyncStatementSpinner() {}
  volatile bool mCompleted;
};

NS_IMPL_ISUPPORTS(AsyncStatementSpinner,
                  mozIStorageStatementCallback,
                  mozIStorageCompletionCallback)

AsyncStatementSpinner::AsyncStatementSpinner()
: completionReason(0)
, mCompleted(false)
{
}

NS_IMETHODIMP
AsyncStatementSpinner::HandleResult(mozIStorageResultSet *aResultSet)
{
  return NS_OK;
}

NS_IMETHODIMP
AsyncStatementSpinner::HandleError(mozIStorageError *aError)
{
  int32_t result;
  nsresult rv = aError->GetResult(&result);
  NS_ENSURE_SUCCESS(rv, rv);
  nsAutoCString message;
  rv = aError->GetMessage(message);
  NS_ENSURE_SUCCESS(rv, rv);

  nsAutoCString warnMsg;
  warnMsg.AppendLiteral("An error occurred while executing an async statement: ");
  warnMsg.AppendInt(result);
  warnMsg.Append(' ');
  warnMsg.Append(message);
  NS_WARNING(warnMsg.get());

  return NS_OK;
}

NS_IMETHODIMP
AsyncStatementSpinner::HandleCompletion(uint16_t aReason)
{
  completionReason = aReason;
  mCompleted = true;
  return NS_OK;
}

NS_IMETHODIMP
AsyncStatementSpinner::Complete(nsresult, nsISupports*)
{
  mCompleted = true;
  return NS_OK;
}

void AsyncStatementSpinner::SpinUntilCompleted()
{
  nsCOMPtr<nsIThread> thread(::do_GetCurrentThread());
  nsresult rv = NS_OK;
  bool processed = true;
  while (!mCompleted && NS_SUCCEEDED(rv)) {
    rv = thread->ProcessNextEvent(true, &processed);
  }
}

#define NS_DECL_ASYNCSTATEMENTSPINNER \
  NS_IMETHOD HandleResult(mozIStorageResultSet *aResultSet) override;

////////////////////////////////////////////////////////////////////////////////
//// Async Helpers

/**
 * Execute an async statement, blocking the main thread until we get the
 * callback completion notification.
 */
void
blocking_async_execute(mozIStorageBaseStatement *stmt)
{
  RefPtr<AsyncStatementSpinner> spinner(new AsyncStatementSpinner());

  nsCOMPtr<mozIStoragePendingStatement> pendy;
  (void)stmt->ExecuteAsync(spinner, getter_AddRefs(pendy));
  spinner->SpinUntilCompleted();
}

/**
 * Invoke AsyncClose on the given connection, blocking the main thread until we
 * get the completion notification.
 */
void
blocking_async_close(mozIStorageConnection *db)
{
  RefPtr<AsyncStatementSpinner> spinner(new AsyncStatementSpinner());

  db->AsyncClose(spinner);
  spinner->SpinUntilCompleted();
}

////////////////////////////////////////////////////////////////////////////////
//// Mutex Watching

/**
 * Verify that mozIStorageAsyncStatement's life-cycle never triggers a mutex on
 * the caller (generally main) thread.  We do this by decorating the sqlite
 * mutex logic with our own code that checks what thread it is being invoked on
 * and sets a flag if it is invoked on the main thread.  We are able to easily
 * decorate the SQLite mutex logic because SQLite allows us to retrieve the
 * current function pointers being used and then provide a new set.
 */

sqlite3_mutex_methods orig_mutex_methods;
sqlite3_mutex_methods wrapped_mutex_methods;

bool mutex_used_on_watched_thread = false;
PRThread *watched_thread = nullptr;
/**
 * Ugly hack to let us figure out what a connection's async thread is.  If we
 * were MOZILLA_INTERNAL_API and linked as such we could just include
 * mozStorageConnection.h and just ask Connection directly.  But that turns out
 * poorly.
 *
 * When the thread a mutex is invoked on isn't watched_thread we save it to this
 * variable.
 */
PRThread *last_non_watched_thread = nullptr;

/**
 * Set a flag if the mutex is used on the thread we are watching, but always
 * call the real mutex function.
 */
extern "C" void wrapped_MutexEnter(sqlite3_mutex *mutex)
{
  PRThread *curThread = ::PR_GetCurrentThread();
  if (curThread == watched_thread)
    mutex_used_on_watched_thread = true;
  else
    last_non_watched_thread = curThread;
  orig_mutex_methods.xMutexEnter(mutex);
}

extern "C" int wrapped_MutexTry(sqlite3_mutex *mutex)
{
  if (::PR_GetCurrentThread() == watched_thread)
    mutex_used_on_watched_thread = true;
  return orig_mutex_methods.xMutexTry(mutex);
}

void hook_sqlite_mutex()
{
  // We need to initialize and teardown SQLite to get it to set up the
  // default mutex handlers for us so we can steal them and wrap them.
  do_check_ok(sqlite3_initialize());
  do_check_ok(sqlite3_shutdown());
  do_check_ok(::sqlite3_config(SQLITE_CONFIG_GETMUTEX, &orig_mutex_methods));
  do_check_ok(::sqlite3_config(SQLITE_CONFIG_GETMUTEX, &wrapped_mutex_methods));
  wrapped_mutex_methods.xMutexEnter = wrapped_MutexEnter;
  wrapped_mutex_methods.xMutexTry = wrapped_MutexTry;
  do_check_ok(::sqlite3_config(SQLITE_CONFIG_MUTEX, &wrapped_mutex_methods));
}

/**
 * Call to clear the watch state and to set the watching against this thread.
 *
 * Check |mutex_used_on_watched_thread| to see if the mutex has fired since
 * this method was last called.  Since we're talking about the current thread,
 * there are no race issues to be concerned about
 */
void watch_for_mutex_use_on_this_thread()
{
  watched_thread = ::PR_GetCurrentThread();
  mutex_used_on_watched_thread = false;
}


////////////////////////////////////////////////////////////////////////////////
//// Thread Wedgers

/**
 * A runnable that blocks until code on another thread invokes its unwedge
 * method.  By dispatching this to a thread you can ensure that no subsequent
 * runnables dispatched to the thread will execute until you invoke unwedge.
 *
 * The wedger is self-dispatching, just construct it with its target.
 */
class ThreadWedger : public mozilla::Runnable
{
public:
  explicit ThreadWedger(nsIEventTarget *aTarget)
  : mReentrantMonitor("thread wedger")
  , unwedged(false)
  {
    aTarget->Dispatch(this, aTarget->NS_DISPATCH_NORMAL);
  }

  NS_IMETHOD Run() override
  {
    mozilla::ReentrantMonitorAutoEnter automon(mReentrantMonitor);

    if (!unwedged)
      automon.Wait();

    return NS_OK;
  }

  void unwedge()
  {
    mozilla::ReentrantMonitorAutoEnter automon(mReentrantMonitor);
    unwedged = true;
    automon.Notify();
  }

private:
  mozilla::ReentrantMonitor mReentrantMonitor;
  bool unwedged;
};

////////////////////////////////////////////////////////////////////////////////
//// Async Helpers

/**
 * A horrible hack to figure out what the connection's async thread is.  By
 * creating a statement and async dispatching we can tell from the mutex who
 * is the async thread, PRThread style.  Then we map that to an nsIThread.
 */
already_AddRefed<nsIThread>
get_conn_async_thread(mozIStorageConnection *db)
{
  // Make sure we are tracking the current thread as the watched thread
  watch_for_mutex_use_on_this_thread();

  // - statement with nothing to bind
  nsCOMPtr<mozIStorageAsyncStatement> stmt;
  db->CreateAsyncStatement(
    NS_LITERAL_CSTRING("SELECT 1"),
    getter_AddRefs(stmt));
  blocking_async_execute(stmt);
  stmt->Finalize();

  nsCOMPtr<nsIThreadManager> threadMan =
    do_GetService("@mozilla.org/thread-manager;1");
  nsCOMPtr<nsIThread> asyncThread;
  threadMan->GetThreadFromPRThread(last_non_watched_thread,
                                   getter_AddRefs(asyncThread));

  // Additionally, check that the thread we get as the background thread is the
  // same one as the one we report from getInterface.
  nsCOMPtr<nsIEventTarget> target = do_GetInterface(db);
  nsCOMPtr<nsIThread> allegedAsyncThread = do_QueryInterface(target);
  PRThread *allegedPRThread;
  (void)allegedAsyncThread->GetPRThread(&allegedPRThread);
  do_check_eq(allegedPRThread, last_non_watched_thread);
  return asyncThread.forget();
}