storage/mozStorageStatementJSHelper.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 "mozStorageStatement.h"
   9 #include "mozStorageService.h"
  10
  11 #include "nsMemory.h"
  12 #include "nsString.h"
  13 #include "nsServiceManagerUtils.h"
  14
  15 #include "mozStorageStatementJSHelper.h"
  16
  17 #include "mozStorageStatementRow.h"
  18 #include "mozStorageStatementParams.h"
  19
  20 #include "jsapi.h"
  21
  22 #include "xpc_make_class.h"
  23
  24 namespace mozilla {
  25 namespace storage {
  26
  27 ////////////////////////////////////////////////////////////////////////////////
  28 //// Global Functions
  29
  30 static bool stepFunc(JSContext* aCtx, uint32_t argc, JS::Value* _vp) {
  31   JS::CallArgs args = CallArgsFromVp(argc, _vp);
  32
  33   nsCOMPtr<nsIXPConnect> xpc(nsIXPConnect::XPConnect());
  34   nsCOMPtr<nsIXPConnectWrappedNative> wrapper;
  35
  36   if (!args.thisv().isObject()) {
  37     ::JS_ReportErrorASCII(aCtx, "mozIStorageStatement::step() requires object");
  38     return false;
  39   }
  40
  41   JS::RootedObject obj(aCtx, &args.thisv().toObject());
  42   nsresult rv =
  43       xpc->GetWrappedNativeOfJSObject(aCtx, obj, getter_AddRefs(wrapper));
  44   if (NS_FAILED(rv)) {
  45     ::JS_ReportErrorASCII(
  46         aCtx, "mozIStorageStatement::step() could not obtain native statement");
  47     return false;
  48   }
  49
  50 #ifdef DEBUG
  51   {
  52     nsCOMPtr<mozIStorageStatement> isStatement(
  53         do_QueryInterface(wrapper->Native()));
  54     NS_ASSERTION(isStatement, "How is this not a statement?!");
  55   }
  56 #endif
  57
  58   Statement* stmt = static_cast<Statement*>(
  59       static_cast<mozIStorageStatement*>(wrapper->Native()));
  60
  61   bool hasMore = false;
  62   rv = stmt->ExecuteStep(&hasMore);
  63   if (NS_SUCCEEDED(rv) && !hasMore) {
  64     args.rval().setBoolean(false);
  65     (void)stmt->Reset();
  66     return true;
  67   }
  68
  69   if (NS_FAILED(rv)) {
  70     ::JS_ReportErrorASCII(aCtx,
  71                           "mozIStorageStatement::step() returned an error");
  72     return false;
  73   }
  74
  75   args.rval().setBoolean(hasMore);
  76   return true;
  77 }
  78
  79 ////////////////////////////////////////////////////////////////////////////////
  80 //// StatementJSHelper
  81
  82 nsresult StatementJSHelper::getRow(Statement* aStatement, JSContext* aCtx,
  83                                    JSObject* aScopeObj, JS::Value* _row) {
  84   MOZ_ASSERT(NS_IsMainThread());
  85
  86 #ifdef DEBUG
  87   int32_t state;
  88   (void)aStatement->GetState(&state);
  89   NS_ASSERTION(state == mozIStorageStatement::MOZ_STORAGE_STATEMENT_EXECUTING,
  90                "Invalid state to get the row object - all calls will fail!");
  91 #endif
  92
  93   JS::RootedObject scope(aCtx, aScopeObj);
  94
  95   if (!aStatement->mStatementRowHolder) {
  96     dom::GlobalObject global(aCtx, scope);
  97     if (global.Failed()) {
  98       return NS_ERROR_UNEXPECTED;
  99     }
 100
 101     nsCOMPtr<nsPIDOMWindowInner> window =
 102         do_QueryInterface(global.GetAsSupports());
 103
 104     RefPtr<StatementRow> row(new StatementRow(window, aStatement));
 105     NS_ENSURE_TRUE(row, NS_ERROR_OUT_OF_MEMORY);
 106
 107     RefPtr<StatementRowHolder> rowHolder = new StatementRowHolder(row);
 108     NS_ENSURE_TRUE(rowHolder, NS_ERROR_OUT_OF_MEMORY);
 109
 110     aStatement->mStatementRowHolder =
 111         new nsMainThreadPtrHolder<StatementRowHolder>(
 112             "Statement::mStatementRowHolder", rowHolder);
 113   }
 114
 115   RefPtr<StatementRow> row(aStatement->mStatementRowHolder->Get());
 116   JSObject* obj = row->WrapObject(aCtx, nullptr);
 117   if (!obj) {
 118     return NS_ERROR_UNEXPECTED;
 119   }
 120
 121   _row->setObject(*obj);
 122   return NS_OK;
 123 }
 124
 125 nsresult StatementJSHelper::getParams(Statement* aStatement, JSContext* aCtx,
 126                                       JSObject* aScopeObj, JS::Value* _params) {
 127   MOZ_ASSERT(NS_IsMainThread());
 128
 129 #ifdef DEBUG
 130   int32_t state;
 131   (void)aStatement->GetState(&state);
 132   NS_ASSERTION(state == mozIStorageStatement::MOZ_STORAGE_STATEMENT_READY,
 133                "Invalid state to get the params object - all calls will fail!");
 134 #endif
 135
 136   JS::RootedObject scope(aCtx, aScopeObj);
 137
 138   if (!aStatement->mStatementParamsHolder) {
 139     dom::GlobalObject global(aCtx, scope);
 140     if (global.Failed()) {
 141       return NS_ERROR_UNEXPECTED;
 142     }
 143
 144     nsCOMPtr<nsPIDOMWindowInner> window =
 145         do_QueryInterface(global.GetAsSupports());
 146
 147     RefPtr<StatementParams> params(new StatementParams(window, aStatement));
 148     NS_ENSURE_TRUE(params, NS_ERROR_OUT_OF_MEMORY);
 149
 150     RefPtr<StatementParamsHolder> paramsHolder =
 151         new StatementParamsHolder(params);
 152     NS_ENSURE_TRUE(paramsHolder, NS_ERROR_OUT_OF_MEMORY);
 153
 154     aStatement->mStatementParamsHolder =
 155         new nsMainThreadPtrHolder<StatementParamsHolder>(
 156             "Statement::mStatementParamsHolder", paramsHolder);
 157   }
 158
 159   RefPtr<StatementParams> params(aStatement->mStatementParamsHolder->Get());
 160   JSObject* obj = params->WrapObject(aCtx, nullptr);
 161   if (!obj) {
 162     return NS_ERROR_UNEXPECTED;
 163   }
 164
 165   _params->setObject(*obj);
 166   return NS_OK;
 167 }
 168
 169 NS_IMETHODIMP_(MozExternalRefCountType) StatementJSHelper::AddRef() {
 170   return 2;
 171 }
 172 NS_IMETHODIMP_(MozExternalRefCountType) StatementJSHelper::Release() {
 173   return 1;
 174 }
 175 NS_INTERFACE_MAP_BEGIN(StatementJSHelper)
 176   NS_INTERFACE_MAP_ENTRY(nsIXPCScriptable)
 177   NS_INTERFACE_MAP_ENTRY(nsISupports)
 178 NS_INTERFACE_MAP_END
 179
 180 ////////////////////////////////////////////////////////////////////////////////
 181 //// nsIXPCScriptable
 182
 183 #define XPC_MAP_CLASSNAME StatementJSHelper
 184 #define XPC_MAP_QUOTED_CLASSNAME "StatementJSHelper"
 185 #define XPC_MAP_FLAGS \
 186   (XPC_SCRIPTABLE_WANT_RESOLVE | XPC_SCRIPTABLE_ALLOW_PROP_MODS_DURING_RESOLVE)
 187 #include "xpc_map_end.h"
 188
 189 NS_IMETHODIMP
 190 StatementJSHelper::Resolve(nsIXPConnectWrappedNative* aWrapper, JSContext* aCtx,
 191                            JSObject* aScopeObj, jsid aId, bool* aResolvedp,
 192                            bool* _retval) {
 193   if (!JSID_IS_STRING(aId)) return NS_OK;
 194
 195   JS::Rooted<JSObject*> scope(aCtx, aScopeObj);
 196   JS::Rooted<jsid> id(aCtx, aId);
 197
 198 #ifdef DEBUG
 199   {
 200     nsCOMPtr<mozIStorageStatement> isStatement(
 201         do_QueryInterface(aWrapper->Native()));
 202     NS_ASSERTION(isStatement, "How is this not a statement?!");
 203   }
 204 #endif
 205
 206   Statement* stmt = static_cast<Statement*>(
 207       static_cast<mozIStorageStatement*>(aWrapper->Native()));
 208
 209   JSLinearString* str = JSID_TO_LINEAR_STRING(id);
 210   if (::JS_LinearStringEqualsLiteral(str, "step")) {
 211     *_retval = ::JS_DefineFunction(aCtx, scope, "step", stepFunc, 0,
 212                                    JSPROP_RESOLVING) != nullptr;
 213     *aResolvedp = true;
 214     return NS_OK;
 215   }
 216
 217   JS::RootedValue val(aCtx);
 218
 219   if (::JS_LinearStringEqualsLiteral(str, "row")) {
 220     nsresult rv = getRow(stmt, aCtx, scope, val.address());
 221     NS_ENSURE_SUCCESS(rv, rv);
 222     *_retval = ::JS_DefinePropertyById(aCtx, scope, id, val, JSPROP_RESOLVING);
 223     *aResolvedp = true;
 224     return NS_OK;
 225   }
 226
 227   if (::JS_LinearStringEqualsLiteral(str, "params")) {
 228     nsresult rv = getParams(stmt, aCtx, scope, val.address());
 229     NS_ENSURE_SUCCESS(rv, rv);
 230     *_retval = ::JS_DefinePropertyById(aCtx, scope, id, val, JSPROP_RESOLVING);
 231     *aResolvedp = true;
 232     return NS_OK;
 233   }
 234
 235   return NS_OK;
 236 }
 237
 238 NS_IMPL_ISUPPORTS0(StatementParamsHolder);
 239
 240 StatementParamsHolder::~StatementParamsHolder() {
 241   MOZ_ASSERT(NS_IsMainThread());
 242   // We are considered dead at this point, so any wrappers for row or params
 243   // need to lose their reference to the statement.
 244   mParams->mStatement = nullptr;
 245 }
 246
 247 NS_IMPL_ISUPPORTS0(StatementRowHolder);
 248
 249 StatementRowHolder::~StatementRowHolder() {
 250   MOZ_ASSERT(NS_IsMainThread());
 251   // We are considered dead at this point, so any wrappers for row or params
 252   // need to lose their reference to the statement.
 253   mRow->mStatement = nullptr;
 254 }
 255
 256 }  // namespace storage
 257 }  // namespace mozilla