1 files changed, 338 insertions, 0 deletions
diff --git a/storage/mozStorageAsyncStatement.cpp b/storage/mozStorageAsyncStatement.cpp
new file mode 100644
index 0000000000..b9332f043b
--- /dev/null
+++ b/storage/mozStorageAsyncStatement.cpp
@@ -0,0 +1,338 @@
+/* -*- 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 <limits.h>
+#include <stdio.h>
+
+#include "nsError.h"
+#include "nsProxyRelease.h"
+#include "nsThreadUtils.h"
+#include "nsIClassInfoImpl.h"
+#include "Variant.h"
+
+#include "mozStorageBindingParams.h"
+#include "mozStorageConnection.h"
+#include "mozStorageAsyncStatementJSHelper.h"
+#include "mozStorageAsyncStatementParams.h"
+#include "mozStoragePrivateHelpers.h"
+#include "mozStorageStatementRow.h"
+#include "mozStorageStatement.h"
+
+#include "mozilla/Logging.h"
+
+extern mozilla::LazyLogModule gStorageLog;
+
+namespace mozilla {
+namespace storage {
+
+////////////////////////////////////////////////////////////////////////////////
+//// nsIClassInfo
+
+NS_IMPL_CI_INTERFACE_GETTER(AsyncStatement, mozIStorageAsyncStatement,
+                            mozIStorageBaseStatement, mozIStorageBindingParams,
+                            mozilla::storage::StorageBaseStatementInternal)
+
+class AsyncStatementClassInfo : public nsIClassInfo {
+ public:
+  constexpr AsyncStatementClassInfo() = default;
+
+  NS_DECL_ISUPPORTS_INHERITED
+
+  NS_IMETHOD
+  GetInterfaces(nsTArray<nsIID>& _array) override {
+    return NS_CI_INTERFACE_GETTER_NAME(AsyncStatement)(_array);
+  }
+
+  NS_IMETHOD
+  GetScriptableHelper(nsIXPCScriptable** _helper) override {
+    static AsyncStatementJSHelper sJSHelper;
+    *_helper = &sJSHelper;
+    return NS_OK;
+  }
+
+  NS_IMETHOD
+  GetContractID(nsACString& aContractID) override {
+    aContractID.SetIsVoid(true);
+    return NS_OK;
+  }
+
+  NS_IMETHOD
+  GetClassDescription(nsACString& aDesc) override {
+    aDesc.SetIsVoid(true);
+    return NS_OK;
+  }
+
+  NS_IMETHOD
+  GetClassID(nsCID** _id) override {
+    *_id = nullptr;
+    return NS_OK;
+  }
+
+  NS_IMETHOD
+  GetFlags(uint32_t* _flags) override {
+    *_flags = 0;
+    return NS_OK;
+  }
+
+  NS_IMETHOD
+  GetClassIDNoAlloc(nsCID* _cid) override { return NS_ERROR_NOT_AVAILABLE; }
+};
+
+NS_IMETHODIMP_(MozExternalRefCountType) AsyncStatementClassInfo::AddRef() {
+  return 2;
+}
+NS_IMETHODIMP_(MozExternalRefCountType) AsyncStatementClassInfo::Release() {
+  return 1;
+}
+NS_IMPL_QUERY_INTERFACE(AsyncStatementClassInfo, nsIClassInfo)
+
+static AsyncStatementClassInfo sAsyncStatementClassInfo;
+
+////////////////////////////////////////////////////////////////////////////////
+//// AsyncStatement
+
+AsyncStatement::AsyncStatement() : mFinalized(false) {}
+
+nsresult AsyncStatement::initialize(Connection* aDBConnection,
+                                    sqlite3* aNativeConnection,
+                                    const nsACString& aSQLStatement) {
+  MOZ_ASSERT(aDBConnection, "No database connection given!");
+  MOZ_ASSERT(aDBConnection->isConnectionReadyOnThisThread(),
+             "Database connection should be valid");
+  MOZ_ASSERT(aNativeConnection, "No native connection given!");
+
+  mDBConnection = aDBConnection;
+  mNativeConnection = aNativeConnection;
+  mSQLString = aSQLStatement;
+
+  MOZ_LOG(gStorageLog, LogLevel::Debug,
+          ("Inited async statement '%s' (0x%p)", mSQLString.get(), this));
+
+#ifdef DEBUG
+  // We want to try and test for LIKE and that consumers are using
+  // escapeStringForLIKE instead of just trusting user input.  The idea to
+  // check to see if they are binding a parameter after like instead of just
+  // using a string.  We only do this in debug builds because it's expensive!
+  auto c = nsCaseInsensitiveCStringComparator;
+  nsACString::const_iterator start, end, e;
+  aSQLStatement.BeginReading(start);
+  aSQLStatement.EndReading(end);
+  e = end;
+  while (::FindInReadable(" LIKE"_ns, start, e, c)) {
+    // We have a LIKE in here, so we perform our tests
+    // FindInReadable moves the iterator, so we have to get a new one for
+    // each test we perform.
+    nsACString::const_iterator s1, s2, s3;
+    s1 = s2 = s3 = start;
+
+    if (!(::FindInReadable(" LIKE ?"_ns, s1, end, c) ||
+          ::FindInReadable(" LIKE :"_ns, s2, end, c) ||
+          ::FindInReadable(" LIKE @"_ns, s3, end, c))) {
+      // At this point, we didn't find a LIKE statement followed by ?, :,
+      // or @, all of which are valid characters for binding a parameter.
+      // We will warn the consumer that they may not be safely using LIKE.
+      NS_WARNING(
+          "Unsafe use of LIKE detected!  Please ensure that you "
+          "are using mozIStorageAsyncStatement::escapeStringForLIKE "
+          "and that you are binding that result to the statement "
+          "to prevent SQL injection attacks.");
+    }
+
+    // resetting start and e
+    start = e;
+    e = end;
+  }
+#endif
+
+  return NS_OK;
+}
+
+mozIStorageBindingParams* AsyncStatement::getParams() {
+  nsresult rv;
+
+  // If we do not have an array object yet, make it.
+  if (!mParamsArray) {
+    nsCOMPtr<mozIStorageBindingParamsArray> array;
+    rv = NewBindingParamsArray(getter_AddRefs(array));
+    NS_ENSURE_SUCCESS(rv, nullptr);
+
+    mParamsArray = static_cast<BindingParamsArray*>(array.get());
+  }
+
+  // If there isn't already any rows added, we'll have to add one to use.
+  if (mParamsArray->length() == 0) {
+    RefPtr<AsyncBindingParams> params(new AsyncBindingParams(mParamsArray));
+    NS_ENSURE_TRUE(params, nullptr);
+
+    rv = mParamsArray->AddParams(params);
+    NS_ENSURE_SUCCESS(rv, nullptr);
+
+    // We have to unlock our params because AddParams locks them.  This is safe
+    // because no reference to the params object was, or ever will be given out.
+    params->unlock(nullptr);
+
+    // We also want to lock our array at this point - we don't want anything to
+    // be added to it.
+    mParamsArray->lock();
+  }
+
+  return *mParamsArray->begin();
+}
+
+/**
+ * If we are here then we know there are no pending async executions relying on
+ * us (StatementData holds a reference to us; this also goes for our own
+ * AsyncStatementFinalizer which proxies its release to the calling event
+ * target) and so it is always safe to destroy our sqlite3_stmt if one exists.
+ * We can be destroyed on the caller event target by
+ * garbage-collection/reference counting or on the async event target by the
+ * last execution of a statement that already lost its main-thread refs.
+ */
+AsyncStatement::~AsyncStatement() {
+  destructorAsyncFinalize();
+
+  // If we are getting destroyed on the wrong event target, proxy the connection
+  // release to the right one.
+  if (!IsOnCurrentSerialEventTarget(mDBConnection->eventTargetOpenedOn)) {
+    // NS_ProxyRelase only magic forgets for us if mDBConnection is an
+    // nsCOMPtr.  Which it is not; it's a RefPtr.
+    nsCOMPtr<nsIEventTarget> target(mDBConnection->eventTargetOpenedOn);
+    NS_ProxyRelease("AsyncStatement::mDBConnection", target,
+                    mDBConnection.forget());
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//// nsISupports
+
+NS_IMPL_ADDREF(AsyncStatement)
+NS_IMPL_RELEASE(AsyncStatement)
+
+NS_INTERFACE_MAP_BEGIN(AsyncStatement)
+  NS_INTERFACE_MAP_ENTRY(mozIStorageAsyncStatement)
+  NS_INTERFACE_MAP_ENTRY(mozIStorageBaseStatement)
+  NS_INTERFACE_MAP_ENTRY(mozIStorageBindingParams)
+  NS_INTERFACE_MAP_ENTRY(mozilla::storage::StorageBaseStatementInternal)
+  if (aIID.Equals(NS_GET_IID(nsIClassInfo))) {
+    foundInterface = static_cast<nsIClassInfo*>(&sAsyncStatementClassInfo);
+  } else
+    NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, mozIStorageAsyncStatement)
+NS_INTERFACE_MAP_END
+
+////////////////////////////////////////////////////////////////////////////////
+//// StorageBaseStatementInternal
+
+Connection* AsyncStatement::getOwner() { return mDBConnection; }
+
+int AsyncStatement::getAsyncStatement(sqlite3_stmt** _stmt) {
+#ifdef DEBUG
+  // Make sure we are never called on the connection's owning event target.
+  NS_ASSERTION(
+      !IsOnCurrentSerialEventTarget(mDBConnection->eventTargetOpenedOn),
+      "We should only be called on the async event target!");
+#endif
+
+  if (!mAsyncStatement) {
+    int rc = mDBConnection->prepareStatement(mNativeConnection, mSQLString,
+                                             &mAsyncStatement);
+    if (rc != SQLITE_OK) {
+      MOZ_LOG(gStorageLog, LogLevel::Error,
+              ("Sqlite statement prepare error: %d '%s'", rc,
+               ::sqlite3_errmsg(mNativeConnection)));
+      MOZ_LOG(gStorageLog, LogLevel::Error,
+              ("Statement was: '%s'", mSQLString.get()));
+      *_stmt = nullptr;
+      return rc;
+    }
+    MOZ_LOG(gStorageLog, LogLevel::Debug,
+            ("Initialized statement '%s' (0x%p)", mSQLString.get(),
+             mAsyncStatement));
+  }
+
+  *_stmt = mAsyncStatement;
+  return SQLITE_OK;
+}
+
+nsresult AsyncStatement::getAsynchronousStatementData(StatementData& _data) {
+  if (mFinalized) return NS_ERROR_UNEXPECTED;
+
+  // Pass null for the sqlite3_stmt; it will be requested on demand from the
+  // async event target.
+  _data = StatementData(nullptr, bindingParamsArray(), this);
+
+  return NS_OK;
+}
+
+already_AddRefed<mozIStorageBindingParams> AsyncStatement::newBindingParams(
+    mozIStorageBindingParamsArray* aOwner) {
+  if (mFinalized) return nullptr;
+
+  nsCOMPtr<mozIStorageBindingParams> params(new AsyncBindingParams(aOwner));
+  return params.forget();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//// mozIStorageAsyncStatement
+
+// (nothing is specific to mozIStorageAsyncStatement)
+
+////////////////////////////////////////////////////////////////////////////////
+//// StorageBaseStatementInternal
+
+// proxy to StorageBaseStatementInternal using its define helper.
+MIXIN_IMPL_STORAGEBASESTATEMENTINTERNAL(
+    AsyncStatement, if (mFinalized) return NS_ERROR_UNEXPECTED;)
+
+NS_IMETHODIMP
+AsyncStatement::Finalize() {
+  if (mFinalized) return NS_OK;
+
+  mFinalized = true;
+
+  MOZ_LOG(gStorageLog, LogLevel::Debug,
+          ("Finalizing statement '%s'", mSQLString.get()));
+
+  asyncFinalize();
+
+  // Release the params holder, so it can release the reference to us.
+  mStatementParamsHolder = nullptr;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+AsyncStatement::BindParameters(mozIStorageBindingParamsArray* aParameters) {
+  if (mFinalized) return NS_ERROR_UNEXPECTED;
+
+  BindingParamsArray* array = static_cast<BindingParamsArray*>(aParameters);
+  if (array->getOwner() != this) return NS_ERROR_UNEXPECTED;
+
+  if (array->length() == 0) return NS_ERROR_UNEXPECTED;
+
+  mParamsArray = array;
+  mParamsArray->lock();
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+AsyncStatement::GetState(int32_t* _state) {
+  if (mFinalized)
+    *_state = MOZ_STORAGE_STATEMENT_INVALID;
+  else
+    *_state = MOZ_STORAGE_STATEMENT_READY;
+
+  return NS_OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//// mozIStorageBindingParams
+
+BOILERPLATE_BIND_PROXIES(AsyncStatement,
+                         if (mFinalized) return NS_ERROR_UNEXPECTED;)
+
+}  // namespace storage
+}  // namespace mozilla