pjs/storage/test/test_true_async.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is storage test code.
*
* The Initial Developer of the Original Code is the Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Andrew Sutherland <asutherland@asutherland.org> (Original Author)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "storage_test_harness.h"
#include "prthread.h"
#include "nsIThread.h"
#include "nsThreadUtils.h"
#include "nsIEventTarget.h"
#include "sqlite3.h"
#include "mozilla/Monitor.h"
#include "mozIStorageStatementCallback.h"
#include "mozIStorageCompletionCallback.h"
#include "mozIStorageBindingParamsArray.h"
#include "mozIStorageBindingParams.h"
#include "mozIStorageAsyncStatement.h"
#include "mozIStorageStatement.h"
#include "mozIStoragePendingStatement.h"
using mozilla::Monitor;
using mozilla::MonitorAutoEnter;
/**
* 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.
*/
/* ===== Mutex Watching ===== */
sqlite3_mutex_methods orig_mutex_methods;
sqlite3_mutex_methods wrapped_mutex_methods;
bool mutex_used_on_watched_thread = false;
PRThread *watched_thread = NULL;
/**
* 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 = NULL;
/**
* 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);
}
#define do_check_ok(aInvoc) do_check_true((aInvoc) == SQLITE_OK)
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;
}
////////////////////////////////////////////////////////////////////////////////
//// Event Loop Spinning
class AsyncStatementSpinner : public mozIStorageStatementCallback,
public mozIStorageCompletionCallback
{
public:
NS_DECL_ISUPPORTS
NS_DECL_MOZISTORAGESTATEMENTCALLBACK
NS_DECL_MOZISTORAGECOMPLETIONCALLBACK
AsyncStatementSpinner();
void SpinUntilCompleted();
PRUint16 completionReason;
private:
~AsyncStatementSpinner() {}
volatile bool mCompleted;
};
NS_IMPL_ISUPPORTS2(AsyncStatementSpinner,
mozIStorageStatementCallback,
mozIStorageCompletionCallback)
AsyncStatementSpinner::AsyncStatementSpinner()
: completionReason(0)
, mCompleted(false)
{
}
NS_IMETHODIMP
AsyncStatementSpinner::HandleResult(mozIStorageResultSet *aResultSet)
{
return NS_OK;
}
NS_IMETHODIMP
AsyncStatementSpinner::HandleError(mozIStorageError *aError)
{
return NS_OK;
}
NS_IMETHODIMP
AsyncStatementSpinner::HandleCompletion(PRUint16 aReason)
{
completionReason = aReason;
mCompleted = true;
return NS_OK;
}
NS_IMETHODIMP
AsyncStatementSpinner::Complete()
{
mCompleted = true;
return NS_OK;
}
void AsyncStatementSpinner::SpinUntilCompleted()
{
nsCOMPtr<nsIThread> thread(::do_GetCurrentThread());
nsresult rv = NS_OK;
PRBool processed = PR_TRUE;
while (!mCompleted && NS_SUCCEEDED(rv)) {
rv = thread->ProcessNextEvent(true, &processed);
}
}
////////////////////////////////////////////////////////////////////////////////
//// 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 nsRunnable
{
public:
ThreadWedger(nsIEventTarget *aTarget)
: mMonitor("thread wedger")
, unwedged(false)
{
aTarget->Dispatch(this, aTarget->NS_DISPATCH_NORMAL);
}
NS_IMETHOD Run()
{
MonitorAutoEnter automon(mMonitor);
if (!unwedged)
automon.Wait();
return NS_OK;
}
void unwedge()
{
MonitorAutoEnter automon(mMonitor);
unwedged = true;
automon.Notify();
}
private:
Monitor mMonitor;
bool unwedged;
};
////////////////////////////////////////////////////////////////////////////////
//// Async Helpers
/**
* Execute an async statement, blocking the main thread until we get the
* callback completion notification.
*/
void
blocking_async_execute(mozIStorageBaseStatement *stmt)
{
nsRefPtr<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)
{
nsRefPtr<AsyncStatementSpinner> spinner(new AsyncStatementSpinner());
db->AsyncClose(spinner);
spinner->SpinUntilCompleted();
}
/**
* 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));
return asyncThread.forget();
}
////////////////////////////////////////////////////////////////////////////////
//// Tests
void
test_TrueAsyncStatement()
{
hook_sqlite_mutex();
nsCOMPtr<mozIStorageConnection> db(getMemoryDatabase());
// Start watching for forbidden mutex usage.
watch_for_mutex_use_on_this_thread();
// - statement with nothing to bind
nsCOMPtr<mozIStorageAsyncStatement> stmt;
db->CreateAsyncStatement(
NS_LITERAL_CSTRING("CREATE TABLE test (id INTEGER PRIMARY KEY)"),
getter_AddRefs(stmt)
);
blocking_async_execute(stmt);
stmt->Finalize();
do_check_false(mutex_used_on_watched_thread);
// - statement with something to bind ordinally
db->CreateAsyncStatement(
NS_LITERAL_CSTRING("INSERT INTO test (id) VALUES (?)"),
getter_AddRefs(stmt)
);
stmt->BindInt32Parameter(0, 1);
blocking_async_execute(stmt);
stmt->Finalize();
do_check_false(mutex_used_on_watched_thread);
// - statement with something to bind by name
db->CreateAsyncStatement(
NS_LITERAL_CSTRING("INSERT INTO test (id) VALUES (:id)"),
getter_AddRefs(stmt)
);
nsCOMPtr<mozIStorageBindingParamsArray> paramsArray;
stmt->NewBindingParamsArray(getter_AddRefs(paramsArray));
nsCOMPtr<mozIStorageBindingParams> params;
paramsArray->NewBindingParams(getter_AddRefs(params));
params->BindInt32ByName(NS_LITERAL_CSTRING("id"), 2);
paramsArray->AddParams(params);
params = nsnull;
stmt->BindParameters(paramsArray);
paramsArray = nsnull;
blocking_async_execute(stmt);
stmt->Finalize();
do_check_false(mutex_used_on_watched_thread);
// - now, make sure creating a sync statement does trigger our guard.
// (If this doesn't happen, our test is bunk and it's important to know that.)
nsCOMPtr<mozIStorageStatement> syncStmt;
db->CreateStatement(NS_LITERAL_CSTRING("SELECT * FROM test"),
getter_AddRefs(syncStmt));
syncStmt->Finalize();
do_check_true(mutex_used_on_watched_thread);
blocking_async_close(db);
}
/**
* Test that cancellation before a statement is run successfully stops the
* statement from executing.
*/
void
test_AsyncCancellation()
{
nsCOMPtr<mozIStorageConnection> db(getMemoryDatabase());
// -- wedge the thread
nsCOMPtr<nsIThread> target(get_conn_async_thread(db));
do_check_true(target);
nsRefPtr<ThreadWedger> wedger (new ThreadWedger(target));
// -- create statements and cancel them
// - async
nsCOMPtr<mozIStorageAsyncStatement> asyncStmt;
db->CreateAsyncStatement(
NS_LITERAL_CSTRING("CREATE TABLE asyncTable (id INTEGER PRIMARY KEY)"),
getter_AddRefs(asyncStmt)
);
nsRefPtr<AsyncStatementSpinner> asyncSpin(new AsyncStatementSpinner());
nsCOMPtr<mozIStoragePendingStatement> asyncPend;
(void)asyncStmt->ExecuteAsync(asyncSpin, getter_AddRefs(asyncPend));
do_check_true(asyncPend);
asyncPend->Cancel();
// - sync
nsCOMPtr<mozIStorageStatement> syncStmt;
db->CreateStatement(
NS_LITERAL_CSTRING("CREATE TABLE syncTable (id INTEGER PRIMARY KEY)"),
getter_AddRefs(syncStmt)
);
nsRefPtr<AsyncStatementSpinner> syncSpin(new AsyncStatementSpinner());
nsCOMPtr<mozIStoragePendingStatement> syncPend;
(void)syncStmt->ExecuteAsync(syncSpin, getter_AddRefs(syncPend));
do_check_true(syncPend);
syncPend->Cancel();
// -- unwedge the async thread
wedger->unwedge();
// -- verify that both statements report they were canceled
asyncSpin->SpinUntilCompleted();
do_check_true(asyncSpin->completionReason ==
mozIStorageStatementCallback::REASON_CANCELED);
syncSpin->SpinUntilCompleted();
do_check_true(syncSpin->completionReason ==
mozIStorageStatementCallback::REASON_CANCELED);
// -- verify that neither statement constructed their tables
nsresult rv;
PRBool exists;
rv = db->TableExists(NS_LITERAL_CSTRING("asyncTable"), &exists);
do_check_true(rv == NS_OK);
do_check_false(exists);
rv = db->TableExists(NS_LITERAL_CSTRING("syncTable"), &exists);
do_check_true(rv == NS_OK);
do_check_false(exists);
// -- cleanup
asyncStmt->Finalize();
syncStmt->Finalize();
blocking_async_close(db);
}
void (*gTests[])(void) = {
// this test must be first because it hooks the mutex mechanics
test_TrueAsyncStatement,
test_AsyncCancellation,
};
const char *file = __FILE__;
#define TEST_NAME "true async statement"
#define TEST_FILE file
#include "storage_test_harness_tail.h"