1
2 /**
3 * Copyright (C) 2018-present MongoDB, Inc.
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the Server Side Public License, version 1,
7 * as published by MongoDB, Inc.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * Server Side Public License for more details.
13 *
14 * You should have received a copy of the Server Side Public License
15 * along with this program. If not, see
16 * <http://www.mongodb.com/licensing/server-side-public-license>.
17 *
18 * As a special exception, the copyright holders give permission to link the
19 * code of portions of this program with the OpenSSL library under certain
20 * conditions as described in each individual source file and distribute
21 * linked combinations including the program with the OpenSSL library. You
22 * must comply with the Server Side Public License in all respects for
23 * all of the code used other than as permitted herein. If you modify file(s)
24 * with this exception, you may extend this exception to your version of the
25 * file(s), but you are not obligated to do so. If you do not wish to do so,
26 * delete this exception statement from your version. If you delete this
27 * exception statement from all source files in the program, then also delete
28 * it in the license file.
29 */
30
31 #define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kQuery
32
33 #include "mongo/platform/basic.h"
34
35 #include "mongo/scripting/mozjs/engine.h"
36
37 #include <js/Initialization.h>
38
39 #include "mongo/db/operation_context.h"
40 #include "mongo/db/server_parameters.h"
41 #include "mongo/scripting/mozjs/implscope.h"
42 #include "mongo/scripting/mozjs/proxyscope.h"
43 #include "mongo/util/log.h"
44
45 namespace js {
46 void DisableExtraThreads();
47 }
48
49 namespace mongo {
50
51 namespace {
52
53 MONGO_EXPORT_SERVER_PARAMETER(disableJavaScriptJIT, bool, false);
54 MONGO_EXPORT_SERVER_PARAMETER(javascriptProtection, bool, false);
55 MONGO_EXPORT_SERVER_PARAMETER(jsHeapLimitMB, int, 1100);
56
57 } // namespace
58
setup()59 void ScriptEngine::setup() {
60 if (getGlobalScriptEngine())
61 return;
62
63 setGlobalScriptEngine(new mozjs::MozJSScriptEngine());
64
65 if (hasGlobalServiceContext()) {
66 getGlobalServiceContext()->registerKillOpListener(getGlobalScriptEngine());
67 }
68 }
69
getInterpreterVersionString()70 std::string ScriptEngine::getInterpreterVersionString() {
71 return "MozJS-38";
72 }
73
74 namespace mozjs {
75
MozJSScriptEngine()76 MozJSScriptEngine::MozJSScriptEngine() {
77 uassert(ErrorCodes::JSInterpreterFailure, "Failed to JS_Init()", JS_Init());
78 js::DisableExtraThreads();
79 }
80
~MozJSScriptEngine()81 MozJSScriptEngine::~MozJSScriptEngine() {
82 JS_ShutDown();
83 }
84
createScope()85 mongo::Scope* MozJSScriptEngine::createScope() {
86 return new MozJSProxyScope(this);
87 }
88
createScopeForCurrentThread()89 mongo::Scope* MozJSScriptEngine::createScopeForCurrentThread() {
90 return new MozJSImplScope(this);
91 }
92
interrupt(unsigned opId)93 void MozJSScriptEngine::interrupt(unsigned opId) {
94 stdx::lock_guard<stdx::mutex> intLock(_globalInterruptLock);
95 OpIdToScopeMap::iterator iScope = _opToScopeMap.find(opId);
96 if (iScope == _opToScopeMap.end()) {
97 // got interrupt request for a scope that no longer exists
98 LOG(1) << "received interrupt request for unknown op: " << opId << printKnownOps_inlock();
99 return;
100 }
101
102 LOG(1) << "interrupting op: " << opId << printKnownOps_inlock();
103 iScope->second->kill();
104 }
105
printKnownOps_inlock()106 std::string MozJSScriptEngine::printKnownOps_inlock() {
107 str::stream out;
108
109 if (shouldLog(logger::LogSeverity::Debug(2))) {
110 out << " known ops: \n";
111
112 for (auto&& iSc : _opToScopeMap) {
113 out << " " << iSc.first << "\n";
114 }
115 }
116
117 return out;
118 }
119
interruptAll()120 void MozJSScriptEngine::interruptAll() {
121 stdx::lock_guard<stdx::mutex> interruptLock(_globalInterruptLock);
122
123 for (auto&& iScope : _opToScopeMap) {
124 iScope.second->kill();
125 }
126 }
127
enableJIT(bool value)128 void MozJSScriptEngine::enableJIT(bool value) {
129 disableJavaScriptJIT.store(!value);
130 }
131
isJITEnabled() const132 bool MozJSScriptEngine::isJITEnabled() const {
133 return !disableJavaScriptJIT.load();
134 }
135
enableJavaScriptProtection(bool value)136 void MozJSScriptEngine::enableJavaScriptProtection(bool value) {
137 javascriptProtection.store(value);
138 }
139
isJavaScriptProtectionEnabled() const140 bool MozJSScriptEngine::isJavaScriptProtectionEnabled() const {
141 return javascriptProtection.load();
142 }
143
getJSHeapLimitMB() const144 int MozJSScriptEngine::getJSHeapLimitMB() const {
145 return jsHeapLimitMB.load();
146 }
147
setJSHeapLimitMB(int limit)148 void MozJSScriptEngine::setJSHeapLimitMB(int limit) {
149 jsHeapLimitMB.store(limit);
150 }
151
registerOperation(OperationContext * opCtx,MozJSImplScope * scope)152 void MozJSScriptEngine::registerOperation(OperationContext* opCtx, MozJSImplScope* scope) {
153 stdx::lock_guard<stdx::mutex> giLock(_globalInterruptLock);
154
155 auto opId = opCtx->getOpID();
156
157 _opToScopeMap[opId] = scope;
158
159 LOG(2) << "SMScope " << static_cast<const void*>(scope) << " registered for op " << opId;
160 Status status = opCtx->checkForInterruptNoAssert();
161 if (!status.isOK()) {
162 scope->kill();
163 }
164 }
165
unregisterOperation(unsigned int opId)166 void MozJSScriptEngine::unregisterOperation(unsigned int opId) {
167 stdx::lock_guard<stdx::mutex> giLock(_globalInterruptLock);
168
169 LOG(2) << "ImplScope " << static_cast<const void*>(this) << " unregistered for op " << opId;
170
171 if (opId != 0) {
172 // scope is currently associated with an operation id
173 auto it = _opToScopeMap.find(opId);
174 if (it != _opToScopeMap.end())
175 _opToScopeMap.erase(it);
176 }
177 }
178
179 } // namespace mozjs
180 } // namespace mongo
181