1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/**
* Copyright (C) 2015 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#pragma once
#include <jsapi.h>
#include <string>
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/platform/decimal128.h"
#include "mongo/scripting/mozjs/exception.h"
#include "mongo/scripting/mozjs/internedstring.h"
#include "mongo/scripting/mozjs/jsstringwrapper.h"
#include "mongo/scripting/mozjs/lifetimestack.h"
namespace mongo {
class BSONObj;
class BSONObjBuilder;
class BSONElement;
namespace mozjs {
class MozJSImplScope;
class ValueWriter;
/**
* Wraps JSObject's with helpers for accessing their properties
*
* This wraps a RootedObject, so should only be allocated on the stack and is
* not movable or copyable
*/
class ObjectWrapper {
friend class ValueWriter;
public:
/**
* Helper subclass that provides some easy boilerplate for accessing
* properties by string, index or id.
*/
class Key {
friend class ObjectWrapper;
enum class Type : char {
Field,
Index,
Id,
InternedString,
};
public:
Key(const char* field) : _field(field), _type(Type::Field) {}
Key(uint32_t idx) : _idx(idx), _type(Type::Index) {}
Key(JS::HandleId id) : _id(id), _type(Type::Id) {}
Key(InternedString id) : _internedString(id), _type(Type::InternedString) {}
private:
void get(JSContext* cx, JS::HandleObject o, JS::MutableHandleValue value);
void set(JSContext* cx, JS::HandleObject o, JS::HandleValue value);
bool has(JSContext* cx, JS::HandleObject o);
bool hasOwn(JSContext* cx, JS::HandleObject o);
void define(JSContext* cx, JS::HandleObject o, JS::HandleValue value, unsigned attrs);
void del(JSContext* cx, JS::HandleObject o);
std::string toString(JSContext* cx);
StringData toStringData(JSContext* cx, JSStringWrapper* jsstr);
union {
const char* _field;
uint32_t _idx;
jsid _id;
InternedString _internedString;
};
Type _type;
};
ObjectWrapper(JSContext* cx, JS::HandleObject obj);
ObjectWrapper(JSContext* cx, JS::HandleValue value);
double getNumber(Key key);
int getNumberInt(Key key);
long long getNumberLongLong(Key key);
Decimal128 getNumberDecimal(Key key);
std::string getString(Key key);
bool getBoolean(Key key);
BSONObj getObject(Key key);
void getValue(Key key, JS::MutableHandleValue value);
void setNumber(Key key, double val);
void setString(Key key, StringData val);
void setBoolean(Key key, bool val);
void setBSONElement(Key key, const BSONElement& elem, const BSONObj& obj, bool readOnly);
void setBSON(Key key, const BSONObj& obj, bool readOnly);
void setValue(Key key, JS::HandleValue value);
void setObject(Key key, JS::HandleObject value);
/**
* See JS_DefineProperty for what sort of attributes might be useful
*/
void defineProperty(Key key, JS::HandleValue value, unsigned attrs);
void deleteProperty(Key key);
/**
* Returns the bson type of the property
*/
int type(Key key);
void rename(Key key, const char* to);
bool hasField(Key key);
bool hasOwnField(Key key);
void callMethod(const char* name, const JS::HandleValueArray& args, JS::MutableHandleValue out);
void callMethod(const char* name, JS::MutableHandleValue out);
void callMethod(JS::HandleValue fun,
const JS::HandleValueArray& args,
JS::MutableHandleValue out);
void callMethod(JS::HandleValue fun, JS::MutableHandleValue out);
/**
* Safely enumerates fields in the object, invoking a callback for each id
*/
template <typename T>
void enumerate(T&& callback) {
JS::Rooted<JS::IdVector> ids(_context, JS::IdVector(_context));
if (!JS_Enumerate(_context, _object, &ids))
throwCurrentJSException(
_context, ErrorCodes::JSInterpreterFailure, "Failure to enumerate object");
JS::RootedId rid(_context);
for (size_t i = 0; i < ids.length(); ++i) {
rid.set(ids[i]);
if (!callback(rid))
break;
}
}
/**
* Writes a bson object reflecting the contents of the object
*/
BSONObj toBSON();
JS::HandleObject thisv() {
return _object;
}
std::string getClassName();
private:
/**
* The maximum depth of recursion for writeField
*/
static const int kMaxWriteFieldDepth = 150;
/**
* The state needed to write a single level of a nested javascript object as a
* bson object.
*
* We use this between ObjectWrapper and ValueWriter to avoid recursion in
* translating js to bson.
*/
struct WriteFieldRecursionFrame {
WriteFieldRecursionFrame(JSContext* cx,
JSObject* obj,
BSONObjBuilder* parent,
StringData sd);
BSONObjBuilder* subbob_or(BSONObjBuilder* option) {
return subbob ? &subbob.get() : option;
}
JS::RootedObject thisv;
// ids for the keys of thisv
JS::Rooted<JS::IdVector> ids;
// Current index of the current key we're working on
std::size_t idx = 0;
boost::optional<BSONObjBuilder> subbob;
BSONObj* originalBSON = nullptr;
bool altered;
};
/**
* Synthetic stack of variables for writeThis
*
* We use a LifetimeStack here because we have SpiderMonkey Rooting types which
* are non-copyable and non-movable and have to be on the stack.
*/
using WriteFieldRecursionFrames = LifetimeStack<WriteFieldRecursionFrame, kMaxWriteFieldDepth>;
/**
* writes the field "key" into the associated builder
*
* optional originalBSON is used to track updates to types (NumberInt
* overwritten by a float, but coercible to the original type, etc.)
*/
void _writeField(BSONObjBuilder* b,
Key key,
WriteFieldRecursionFrames* frames,
BSONObj* originalBSON);
JSContext* _context;
JS::RootedObject _object;
};
} // namespace mozjs
} // namespace mongo
|
