storage/mozStorageAsyncStatementJSHelper.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "nsIXPConnect.h"
   8 #include "mozStorageAsyncStatement.h"
   9 #include "mozStorageService.h"
  10
  11 #include "nsString.h"
  12 #include "nsServiceManagerUtils.h"
  13
  14 #include "mozStorageAsyncStatementJSHelper.h"
  15
  16 #include "mozStorageAsyncStatementParams.h"
  17
  18 #include "jsapi.h"
  19 #include "js/PropertyAndElement.h"  // JS_DefineProperty, JS_DefinePropertyById
  20
  21 #include "xpc_make_class.h"
  22
  23 namespace mozilla {
  24 namespace storage {
  25
  26 ////////////////////////////////////////////////////////////////////////////////
  27 //// AsyncStatementJSHelper
  28
  29 nsresult AsyncStatementJSHelper::getParams(AsyncStatement* aStatement,
  30                                            JSContext* aCtx, JSObject* aScopeObj,
  31                                            JS::Value* _params) {
  32   MOZ_ASSERT(NS_IsMainThread());
  33
  34 #ifdef DEBUG
  35   int32_t state;
  36   (void)aStatement->GetState(&state);
  37   NS_ASSERTION(state == mozIStorageAsyncStatement::MOZ_STORAGE_STATEMENT_READY,
  38                "Invalid state to get the params object - all calls will fail!");
  39 #endif
  40
  41   JS::Rooted<JSObject*> scope(aCtx, aScopeObj);
  42
  43   if (!aStatement->mStatementParamsHolder) {
  44     dom::GlobalObject global(aCtx, scope);
  45     if (global.Failed()) {
  46       return NS_ERROR_UNEXPECTED;
  47     }
  48
  49     nsCOMPtr<nsPIDOMWindowInner> window =
  50         do_QueryInterface(global.GetAsSupports());
  51
  52     RefPtr<AsyncStatementParams> params(
  53         new AsyncStatementParams(window, aStatement));
  54     NS_ENSURE_TRUE(params, NS_ERROR_OUT_OF_MEMORY);
  55
  56     RefPtr<AsyncStatementParamsHolder> paramsHolder =
  57         new AsyncStatementParamsHolder(params);
  58     NS_ENSURE_TRUE(paramsHolder, NS_ERROR_OUT_OF_MEMORY);
  59
  60     aStatement->mStatementParamsHolder =
  61         new nsMainThreadPtrHolder<AsyncStatementParamsHolder>(
  62             "Statement::mStatementParamsHolder", paramsHolder);
  63   }
  64
  65   RefPtr<AsyncStatementParams> params(
  66       aStatement->mStatementParamsHolder->Get());
  67   JSObject* obj = params->WrapObject(aCtx, nullptr);
  68   if (!obj) {
  69     return NS_ERROR_UNEXPECTED;
  70   }
  71
  72   _params->setObject(*obj);
  73   return NS_OK;
  74 }
  75
  76 NS_IMETHODIMP_(MozExternalRefCountType) AsyncStatementJSHelper::AddRef() {
  77   return 2;
  78 }
  79 NS_IMETHODIMP_(MozExternalRefCountType) AsyncStatementJSHelper::Release() {
  80   return 1;
  81 }
  82 NS_INTERFACE_MAP_BEGIN(AsyncStatementJSHelper)
  83   NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
  84   NS_INTERFACE_MAP_ENTRY(nsISupports)
  85 NS_INTERFACE_MAP_END
  86
  87 ////////////////////////////////////////////////////////////////////////////////
  88 //// nsIXPCScriptable
  89
  90 #define XPC_MAP_CLASSNAME AsyncStatementJSHelper
  91 #define XPC_MAP_QUOTED_CLASSNAME "AsyncStatementJSHelper"
  92 #define XPC_MAP_FLAGS \
  93   (XPC_SCRIPTABLE_WANT_RESOLVE | XPC_SCRIPTABLE_ALLOW_PROP_MODS_DURING_RESOLVE)
  94 #include "xpc_map_end.h"
  95
  96 NS_IMETHODIMP
  97 AsyncStatementJSHelper::Resolve(nsIXPConnectWrappedNative* aWrapper,
  98                                 JSContext* aCtx, JSObject* aScopeObj, jsid aId,
  99                                 bool* resolvedp, bool* _retval) {
 100   if (!aId.isString()) return NS_OK;
 101
 102   // Cast to async via mozI* since direct from nsISupports is ambiguous.
 103   JS::Rooted<JSObject*> scope(aCtx, aScopeObj);
 104   JS::Rooted<JS::PropertyKey> id(aCtx, aId);
 105   mozIStorageAsyncStatement* iAsyncStmt =
 106       static_cast<mozIStorageAsyncStatement*>(aWrapper->Native());
 107   AsyncStatement* stmt = static_cast<AsyncStatement*>(iAsyncStmt);
 108
 109 #ifdef DEBUG
 110   {
 111     nsISupports* supp = aWrapper->Native();
 112     nsCOMPtr<mozIStorageAsyncStatement> isStatement(do_QueryInterface(supp));
 113     NS_ASSERTION(isStatement, "How is this not an async statement?!");
 114   }
 115 #endif
 116
 117   if (::JS_LinearStringEqualsLiteral(id.toLinearString(), "params")) {
 118     JS::Rooted<JS::Value> val(aCtx);
 119     nsresult rv = getParams(stmt, aCtx, scope, val.address());
 120     NS_ENSURE_SUCCESS(rv, rv);
 121     *_retval = ::JS_DefinePropertyById(aCtx, scope, id, val, JSPROP_RESOLVING);
 122     *resolvedp = true;
 123     return NS_OK;
 124   }
 125
 126   return NS_OK;
 127 }
 128
 129 ////////////////////////////////////////////////////////////////////////////////
 130 //// AsyncStatementParamsHolder
 131
 132 NS_IMPL_ISUPPORTS0(AsyncStatementParamsHolder);
 133
 134 AsyncStatementParamsHolder::~AsyncStatementParamsHolder() {
 135   MOZ_ASSERT(NS_IsMainThread());
 136   // We are considered dead at this point, so any wrappers for row or params
 137   // need to lose their reference to the statement.
 138   mParams->mStatement = nullptr;
 139 }
 140
 141 }  // namespace storage
 142 }  // namespace mozilla