Merge pull request #93 from realm/al-rpc-cpp

Rewrite rpc server in c++ so it can be used on android

ReactNative/RealmReact.h

@@ -16,8 +16,8 @@
 //
 ////////////////////////////////////////////////////////////////////////////
 
-@import Foundation;
+#import <Foundation/Foundation.h>
-@import JavaScriptCore;
+#import <JavaScriptCore/JavaScriptCore.h>
 
 extern JSGlobalContextRef RealmReactGetJSGlobalContextForExecutor(id executor, bool create);
 

ReactNative/RealmReact.mm

@@ -16,13 +16,14 @@
 //
 ////////////////////////////////////////////////////////////////////////////
 
+extern "C" {
 #import "RealmReact.h"
 #import "Base/RCTBridge.h"
 
-@import GCDWebServers;
+#import <GCDWebServers/GCDWebServers.h>
-@import RealmJS;
+#import <RealmJS/RealmJS.h>
-@import ObjectiveC;
+#import <objc/runtime.h>
-@import Darwin;
+#import <dlfcn.h>
 
 @interface NSObject (RCTJavaScriptContext)
 - (instancetype)initWithJSContext:(JSGlobalContextRef)context;
@@ -50,6 +51,10 @@ JSGlobalContextRef RealmReactGetJSGlobalContextForExecutor(id executor, bool cre
     
     return [rctJSContext ctx];
 }
+}
+
+#import <RealmJS/RealmRPC.hpp>
+#import <RealmJS/RJSUtil.hpp>
 
 @interface RealmReact () <RCTBridgeModule>
 @end
@@ -59,7 +64,7 @@ JSGlobalContextRef RealmReactGetJSGlobalContextForExecutor(id executor, bool cre
 @synthesize bridge = _bridge;
 
 + (void)load {
-    void (*RCTRegisterModule)(Class) = dlsym(RTLD_DEFAULT, "RCTRegisterModule");
+    void (*RCTRegisterModule)(Class) = (void (*)(Class))dlsym(RTLD_DEFAULT, "RCTRegisterModule");
 
     if (RCTRegisterModule) {
         RCTRegisterModule(self);
@@ -77,10 +82,14 @@ JSGlobalContextRef RealmReactGetJSGlobalContextForExecutor(id executor, bool cre
     _bridge = bridge;
 
     static GCDWebServer *s_webServer;
+    static realm_js::RPCServer *rpcServer;
+
     if (s_webServer) {
         [s_webServer stop];
         [s_webServer removeAllHandlers];
         s_webServer = nil;
+
+        delete rpcServer;
     }
 
     // The executor could be a RCTWebSocketExecutor, in which case it won't have a JS context.
@@ -89,23 +98,28 @@ JSGlobalContextRef RealmReactGetJSGlobalContextForExecutor(id executor, bool cre
     if ([executor isMemberOfClass:NSClassFromString(@"RCTWebSocketExecutor")]) {
         [GCDWebServer setLogLevel:3];
         GCDWebServer *webServer = [[GCDWebServer alloc] init];
-        RJSRPCServer *rpcServer = [[RJSRPCServer alloc] init];
+        rpcServer = new realm_js::RPCServer();
 
         // Add a handler to respond to POST requests on any URL
         [webServer addDefaultHandlerForMethod:@"POST"
                                  requestClass:[GCDWebServerDataRequest class]
                                  processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {
-            NSError *error;
-            NSData *data = [(GCDWebServerDataRequest *)request data];
-            NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];
             GCDWebServerResponse *response;
-
+            try {
-            if (error || ![json isKindOfClass:[NSDictionary class]]) {
+                // perform all realm ops on the main thread
-                NSLog(@"Invalid RPC request - %@", error ?: json);
+                __block NSData *responseData;
-                response = [GCDWebServerErrorResponse responseWithClientError:kGCDWebServerHTTPStatusCode_UnprocessableEntity underlyingError:error message:@"Invalid RPC request"];
+                dispatch_sync(dispatch_get_main_queue(), ^{
+                    realm_js::json args = realm_js::json::parse([[(GCDWebServerDataRequest *)request text] UTF8String]);
+                    std::string responseText = rpcServer->perform_request(request.path.UTF8String, args).dump();
+                    responseData = [NSData dataWithBytes:responseText.c_str() length:responseText.length()];
+                });
+                response = [[GCDWebServerDataResponse alloc] initWithData:responseData contentType:@"application/json"];
             }
-            else {
+            catch(std::exception &ex) {
-                response = [GCDWebServerDataResponse responseWithJSONObject:[rpcServer performRequest:request.path args:json]];
+                NSLog(@"Invalid RPC request - %@", [(GCDWebServerDataRequest *)request text]);
+                response = [GCDWebServerErrorResponse responseWithClientError:kGCDWebServerHTTPStatusCode_UnprocessableEntity
+                                                              underlyingError:nil
+                                                                      message:@"Invalid RPC request"];
             }
 
             [response setValue:@"http://localhost:8081" forAdditionalHeader:@"Access-Control-Allow-Origin"];

RealmJS.xcodeproj/project.pbxproj

@@ -7,7 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
-		02258FB31BC6E2D00075F13A /* RealmRPC.h in Headers */ = {isa = PBXBuildFile; fileRef = 02258FB11BC6E2D00075F13A /* RealmRPC.h */; settings = {ATTRIBUTES = (Public, ); }; };
+		02258FB31BC6E2D00075F13A /* RealmRPC.hpp in Headers */ = {isa = PBXBuildFile; fileRef = 02258FB11BC6E2D00075F13A /* RealmRPC.hpp */; settings = {ATTRIBUTES = (Public, ); }; };
 		02258FB41BC6E2D00075F13A /* RealmRPC.mm in Sources */ = {isa = PBXBuildFile; fileRef = 02258FB21BC6E2D00075F13A /* RealmRPC.mm */; };
 		02409DC21BCF11D6005F3B3E /* RealmJSCoreTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 02409DC11BCF11D6005F3B3E /* RealmJSCoreTests.m */; settings = {ASSET_TAGS = (); }; };
 		02601F031BA0F0C4007C91FF /* external_commit_helper.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 02601F011BA0F0C4007C91FF /* external_commit_helper.cpp */; };
@@ -50,7 +50,8 @@
 		0270BC851B7D020100010E03 /* asserts.js in Resources */ = {isa = PBXBuildFile; fileRef = 0270BC7E1B7D020100010E03 /* asserts.js */; };
 		0270BC861B7D020100010E03 /* schemas.js in Resources */ = {isa = PBXBuildFile; fileRef = 0270BC7F1B7D020100010E03 /* schemas.js */; };
 		0270BC871B7D023200010E03 /* RealmJS.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 02B58CB11AE99CEC009B348C /* RealmJS.framework */; };
-		0270BCD11B7D067300010E03 /* RealmReact.m in Sources */ = {isa = PBXBuildFile; fileRef = 0270BCD01B7D067300010E03 /* RealmReact.m */; };
+		0270BCD11B7D067300010E03 /* RealmReact.mm in Sources */ = {isa = PBXBuildFile; fileRef = 0270BCD01B7D067300010E03 /* RealmReact.mm */; };
+		0291DBD21BD994F700E3852C /* JavaScriptCore.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 02B58CCD1AE99D4D009B348C /* JavaScriptCore.framework */; };
 		02B29A311B7CF86D008A7E6B /* RealmJS.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 02B58CB11AE99CEC009B348C /* RealmJS.framework */; };
 		02B58CCE1AE99D4D009B348C /* JavaScriptCore.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 02B58CCD1AE99D4D009B348C /* JavaScriptCore.framework */; };
 		02C0864E1BCDB27000942F9C /* list.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 02C0864C1BCDB27000942F9C /* list.cpp */; settings = {ASSET_TAGS = (); }; };
@@ -156,7 +157,7 @@
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
-		02258FB11BC6E2D00075F13A /* RealmRPC.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = RealmRPC.h; path = src/RealmRPC.h; sourceTree = "<group>"; };
+		02258FB11BC6E2D00075F13A /* RealmRPC.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = RealmRPC.hpp; path = src/RealmRPC.hpp; sourceTree = "<group>"; };
 		02258FB21BC6E2D00075F13A /* RealmRPC.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; name = RealmRPC.mm; path = src/RealmRPC.mm; sourceTree = "<group>"; };
 		02409DC11BCF11D6005F3B3E /* RealmJSCoreTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = RealmJSCoreTests.m; path = tests/RealmJSCoreTests.m; sourceTree = SOURCE_ROOT; };
 		02601F011BA0F0C4007C91FF /* external_commit_helper.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = external_commit_helper.cpp; path = "src/object-store/apple/external_commit_helper.cpp"; sourceTree = "<group>"; };
@@ -202,7 +203,7 @@
 		0270BC7E1B7D020100010E03 /* asserts.js */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.javascript; name = asserts.js; path = tests/asserts.js; sourceTree = SOURCE_ROOT; };
 		0270BC7F1B7D020100010E03 /* schemas.js */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.javascript; name = schemas.js; path = tests/schemas.js; sourceTree = SOURCE_ROOT; };
 		0270BCCF1B7D067300010E03 /* RealmReact.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = RealmReact.h; path = ReactNative/RealmReact.h; sourceTree = "<group>"; };
-		0270BCD01B7D067300010E03 /* RealmReact.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = RealmReact.m; path = ReactNative/RealmReact.m; sourceTree = "<group>"; };
+		0270BCD01B7D067300010E03 /* RealmReact.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; name = RealmReact.mm; path = ReactNative/RealmReact.mm; sourceTree = "<group>"; };
 		02A3C7841BC4317A00B1A7BE /* GCDWebServer.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = GCDWebServer.xcodeproj; path = vendor/GCDWebServer/GCDWebServer.xcodeproj; sourceTree = "<group>"; };
 		02A3C7A41BC4341500B1A7BE /* libc++.tbd */ = {isa = PBXFileReference; lastKnownFileType = "sourcecode.text-based-dylib-definition"; name = "libc++.tbd"; path = "usr/lib/libc++.tbd"; sourceTree = SDKROOT; };
 		02B29A161B7CF7C9008A7E6B /* RealmReact.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = RealmReact.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -225,6 +226,7 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				0291DBD21BD994F700E3852C /* JavaScriptCore.framework in Frameworks */,
 				F6B3963D1BCE2430008BDC39 /* GCDWebServers.framework in Frameworks */,
 				02B29A311B7CF86D008A7E6B /* RealmJS.framework in Frameworks */,
 			);
@@ -276,7 +278,7 @@
 				02601F071BA0F0CD007C91FF /* realm_delegate.hpp */,
 				0270BC3E1B7CFC0D00010E03 /* RealmJS.h */,
 				0270BC3F1B7CFC0D00010E03 /* RealmJS.mm */,
-				02258FB11BC6E2D00075F13A /* RealmRPC.h */,
+				02258FB11BC6E2D00075F13A /* RealmRPC.hpp */,
 				02258FB21BC6E2D00075F13A /* RealmRPC.mm */,
 				0270BC401B7CFC0D00010E03 /* RJSList.cpp */,
 				0270BC411B7CFC0D00010E03 /* RJSList.hpp */,
@@ -299,7 +301,7 @@
 			isa = PBXGroup;
 			children = (
 				0270BCCF1B7D067300010E03 /* RealmReact.h */,
-				0270BCD01B7D067300010E03 /* RealmReact.m */,
+				0270BCD01B7D067300010E03 /* RealmReact.mm */,
 			);
 			name = RealmReact;
 			sourceTree = "<group>";
@@ -387,7 +389,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				0270BC4C1B7CFC0D00010E03 /* RealmJS.h in Headers */,
-				02258FB31BC6E2D00075F13A /* RealmRPC.h in Headers */,
+				02258FB31BC6E2D00075F13A /* RealmRPC.hpp in Headers */,
 				0270BC4F1B7CFC0D00010E03 /* RJSList.hpp in Headers */,
 				0270BC541B7CFC0D00010E03 /* RJSResults.hpp in Headers */,
 				0270BC581B7CFC0D00010E03 /* RJSUtil.hpp in Headers */,
@@ -626,7 +628,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				0270BCD11B7D067300010E03 /* RealmReact.m in Sources */,
+				0270BCD11B7D067300010E03 /* RealmReact.mm in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -706,6 +708,7 @@
 					/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include,
 					"$(SRCROOT)/examples/ReactExample/node_modules/react-native/React/",
 					"$(SRCROOT)/tests/ReactTests/node_modules/react-native/React/",
+					"$(SRCROOT)/vendor",
 				);
 				INFOPLIST_FILE = src/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
@@ -739,6 +742,7 @@
 					/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include,
 					"$(SRCROOT)/examples/ReactExample/node_modules/react-native/React/",
 					"$(SRCROOT)/tests/ReactTests/node_modules/react-native/React/",
+					"$(SRCROOT)/vendor",
 				);
 				INFOPLIST_FILE = src/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
@@ -772,6 +776,7 @@
 					/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include,
 					"$(SRCROOT)/examples/ReactExample/node_modules/react-native/React/",
 					"$(SRCROOT)/tests/ReactTests/node_modules/react-native/React/",
+					"$(SRCROOT)/vendor",
 				);
 				INFOPLIST_FILE = src/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
@@ -902,6 +907,7 @@
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include,
+					"$(SRCROOT)/vendor",
 				);
 				INFOPLIST_FILE = src/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
@@ -935,6 +941,7 @@
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include,
+					"$(SRCROOT)/vendor",
 				);
 				INFOPLIST_FILE = src/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
@@ -966,6 +973,7 @@
 					"DEBUG=1",
 					"$(inherited)",
 				);
+				HEADER_SEARCH_PATHS = "";
 				INFOPLIST_FILE = tests/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
@@ -987,6 +995,7 @@
 					"$(inherited)",
 					build/iOS,
 				);
+				HEADER_SEARCH_PATHS = "";
 				INFOPLIST_FILE = tests/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
@@ -1068,6 +1077,7 @@
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include,
+					"$(SRCROOT)/vendor",
 				);
 				INFOPLIST_FILE = src/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
@@ -1099,6 +1109,7 @@
 					"DEBUG=1",
 					"$(inherited)",
 				);
+				HEADER_SEARCH_PATHS = "";
 				INFOPLIST_FILE = tests/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";

src/RealmJS.h

@@ -18,7 +18,6 @@
 
 #import <Foundation/Foundation.h>
 #import <JavaScriptCore/JavaScriptCore.h>
-#import <RealmJS/RealmRPC.h>
 
 @interface RealmJS : NSObject
 

src/RealmRPC.h

@@ -1,27 +0,0 @@
-////////////////////////////////////////////////////////////////////////////
-//
-// Copyright 2015 Realm Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-////////////////////////////////////////////////////////////////////////////
-
-#pragma once
-
-#import <Foundation/Foundation.h>
-
-@interface RJSRPCServer : NSObject
-
-- (NSDictionary *)performRequest:(NSString *)name args:(NSDictionary *)args;
-
-@end

src/RealmRPC.hpp

@@ -0,0 +1,55 @@
+////////////////////////////////////////////////////////////////////////////
+//
+// Copyright 2015 Realm Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////
+
+#pragma once
+
+#import "json.hpp"
+#import <JavaScriptCore/JavaScriptCore.h>
+
+namespace realm {
+    class ObjectSchema;
+}
+
+namespace realm_js {
+
+using json = nlohmann::json;
+using RPCObjectID = u_int64_t;
+using RPCRequest = std::function<json(const json)>;
+
+class RPCServer {
+  public:
+    RPCServer();
+    ~RPCServer();
+    json perform_request(std::string name, json &args);
+
+  private:
+    JSGlobalContextRef m_context;
+    std::map<std::string, RPCRequest> m_requests;
+    std::map<RPCObjectID, JSObjectRef> m_objects;
+    RPCObjectID m_session_id;
+
+    RPCObjectID store_object(JSObjectRef object);
+
+    json serialize_json_value(JSValueRef value);
+    JSValueRef deserialize_json_value(const json dict);
+
+    json serialize_object_schema(realm::ObjectSchema &objectSchema);
+};
+
+}
+

src/RealmRPC.mm

@@ -16,8 +16,7 @@
 //
 ////////////////////////////////////////////////////////////////////////////
 
-#import "RealmRPC.h"
+#import "RealmRPC.hpp"
-#import <JavaScriptCore/JavaScriptCore.h>
 
 #include <dlfcn.h>
 #include <map>
@@ -33,371 +32,332 @@
 #include "shared_realm.hpp"
 #include "results.hpp"
 
-using RPCObjectID = u_int64_t;
+using namespace realm_js;
-using RPCRequest = std::function<NSDictionary *(NSDictionary *dictionary)>;
 
 static const char * const RealmObjectTypesFunction = "ObjectTypesFUNCTION";
 static const char * const RealmObjectTypesNotification = "ObjectTypesNOTIFICATION";
 static const char * const RealmObjectTypesResults = "ObjectTypesRESULTS";
 
-@implementation RJSRPCServer {
+RPCServer::RPCServer() {
-    JSGlobalContextRef _context;
+    m_context = JSGlobalContextCreate(NULL);
-    std::map<std::string, RPCRequest> _requests;
-    std::map<RPCObjectID, JSObjectRef> _objects;
-    RPCObjectID _sessionID;
-}
-
-- (void)dealloc {
-    for (auto item : _objects) {
-        JSValueUnprotect(_context, item.second);
-    }
-
-    JSGlobalContextRelease(_context);
-    _requests.clear();
-}
-
-- (instancetype)init {
-    self = [super init];
-    if (self) {
-        _context = JSGlobalContextCreate(NULL);
 
     // JavaScriptCore crashes when trying to walk up the native stack to print the stacktrace.
     // FIXME: Avoid having to do this!
     static void (*setIncludesNativeCallStack)(JSGlobalContextRef, bool) = (void (*)(JSGlobalContextRef, bool))dlsym(RTLD_DEFAULT, "JSGlobalContextSetIncludesNativeCallStackWhenReportingExceptions");
     if (setIncludesNativeCallStack) {
-            setIncludesNativeCallStack(_context, false);
+        setIncludesNativeCallStack(m_context, false);
     }
 
-        id _self = self;
+    m_requests["/create_session"] = [this](const json dict) {
-        __weak __typeof__(self) self = _self;
+        [RealmJS initializeContext:m_context];
 
-        _requests["/create_session"] = [=](NSDictionary *dict) {
+        JSStringRef realm_string = RJSStringForString("Realm");
-            [RealmJS initializeContext:_context];
+        JSObjectRef realm_constructor = RJSValidatedObjectProperty(m_context, JSContextGetGlobalObject(m_context), realm_string);
+        JSStringRelease(realm_string);
 
-            JSStringRef realmString = RJSStringForString("Realm");
+        m_session_id = store_object(realm_constructor);
-            JSObjectRef realmConstructor = RJSValidatedObjectProperty(_context, JSContextGetGlobalObject(_context), realmString);
+        return (json){{"result", m_session_id}};
-            JSStringRelease(realmString);
-
-            _sessionID = [self storeObject:realmConstructor];
-            return @{@"result": @(_sessionID)};
     };
-        _requests["/create_realm"] = [=](NSDictionary *dict) {
+    m_requests["/create_realm"] = [this](const json dict) {
-            JSObjectRef realmConstructor = _sessionID ? _objects[_sessionID] : NULL;
+        JSObjectRef realm_constructor = m_session_id ? m_objects[m_session_id] : NULL;
-            if (!realmConstructor) {
+        if (!realm_constructor) {
             throw std::runtime_error("Realm constructor not found!");
         }
 
-            NSArray *args = dict[@"arguments"];
+        json::array_t args = dict["arguments"];
-            NSUInteger argCount = args.count;
+        size_t arg_count = args.size();
-            JSValueRef argValues[argCount];
+        JSValueRef arg_values[arg_count];
 
-            for (NSUInteger i = 0; i < argCount; i++) {
+        for (size_t i = 0; i < arg_count; i++) {
-                argValues[i] = [self deserializeDictionaryValue:args[i]];
+            arg_values[i] = deserialize_json_value(args[i]);
         }
 
         JSValueRef exception = NULL;
-            JSObjectRef realmObject = JSObjectCallAsConstructor(_context, realmConstructor, argCount, argValues, &exception);
+        JSObjectRef realm_object = JSObjectCallAsConstructor(m_context, realm_constructor, arg_count, arg_values, &exception);
-
         if (exception) {
-                return @{@"error": @(RJSStringForValue(_context, exception).c_str())};
+            return (json){{"error", RJSStringForValue(m_context, exception)}};
         }
 
-            RPCObjectID realmId = [self storeObject:realmObject];
+        RPCObjectID realm_id = store_object(realm_object);
-            return @{@"result": @(realmId)};
+        return (json){{"result", realm_id}};
     };
-        _requests["/begin_transaction"] = [=](NSDictionary *dict) {
+    m_requests["/begin_transaction"] = [this](const json dict) {
-            RPCObjectID realmId = [dict[@"realmId"] unsignedLongValue];
+        RPCObjectID realm_id = dict["realmId"].get<RPCObjectID>();
-            RJSGetInternal<realm::SharedRealm *>(_objects[realmId])->get()->begin_transaction();
+        RJSGetInternal<realm::SharedRealm *>(m_objects[realm_id])->get()->begin_transaction();
-            return nil;
+        return json::object();
     };
-        _requests["/cancel_transaction"] = [=](NSDictionary *dict) {
+    m_requests["/cancel_transaction"] = [this](const json dict) {
-            RPCObjectID realmId = [dict[@"realmId"] unsignedLongValue];
+        RPCObjectID realm_id = dict["realmId"].get<RPCObjectID>();
-            RJSGetInternal<realm::SharedRealm *>(_objects[realmId])->get()->cancel_transaction();
+        RJSGetInternal<realm::SharedRealm *>(m_objects[realm_id])->get()->cancel_transaction();
-            return nil;
+        return json::object();
     };
-        _requests["/commit_transaction"] = [=](NSDictionary *dict) {
+    m_requests["/commit_transaction"] = [this](const json dict) {
-            RPCObjectID realmId = [dict[@"realmId"] unsignedLongValue];
+        RPCObjectID realm_id = dict["realmId"].get<RPCObjectID>();
-            RJSGetInternal<realm::SharedRealm *>(_objects[realmId])->get()->commit_transaction();
+        RJSGetInternal<realm::SharedRealm *>(m_objects[realm_id])->get()->commit_transaction();
-            return nil;
+        return json::object();
     };
-        _requests["/call_method"] = [=](NSDictionary *dict) {
+    m_requests["/call_method"] = [this](const json dict) {
-            return [self performObjectMethod:dict[@"name"]
+        JSObjectRef object = m_objects[dict["id"].get<RPCObjectID>()];
-                                        args:dict[@"arguments"]
+        JSStringRef method_string = RJSStringForString(dict["name"].get<std::string>());
-                                    objectId:[dict[@"id"] unsignedLongValue]];
+        JSObjectRef function = RJSValidatedObjectProperty(m_context, object, method_string);
+        JSStringRelease(method_string);
+
+        json args = dict["arguments"];
+        size_t count = args.size();
+        JSValueRef arg_values[count];
+        for (size_t i = 0; i < count; i++) {
+            arg_values[i] = deserialize_json_value(args[i]);
+        }
+
+        JSValueRef exception = NULL;
+        JSValueRef result = JSObjectCallAsFunction(m_context, function, object, count, arg_values, &exception);
+        if (exception) {
+            return (json){{"error", RJSStringForValue(m_context, exception)}};
+        }
+        return (json){{"result", serialize_json_value(result)}};
     };
-        _requests["/get_property"] = [=](NSDictionary *dict) {
+    m_requests["/get_property"] = [this](const json dict) {
-            RPCObjectID oid = [dict[@"id"] unsignedLongValue];
+        RPCObjectID oid = dict["id"].get<RPCObjectID>();
-            id name = dict[@"name"];
+        json name = dict["name"];
         JSValueRef value = NULL;
         JSValueRef exception = NULL;
 
-            if ([name isKindOfClass:[NSNumber class]]) {
+        if (name.is_number()) {
-                value = JSObjectGetPropertyAtIndex(_context, _objects[oid], [name unsignedIntValue], &exception);
+            value = JSObjectGetPropertyAtIndex(m_context, m_objects[oid], name.get<unsigned int>(), &exception);
         }
         else {
-                JSStringRef propString = RJSStringForString([name UTF8String]);
+            JSStringRef prop_string = RJSStringForString(name.get<std::string>());
-                value = JSObjectGetProperty(_context, _objects[oid], propString, &exception);
+            value = JSObjectGetProperty(m_context, m_objects[oid], prop_string, &exception);
-                JSStringRelease(propString);
+            JSStringRelease(prop_string);
         }
 
         if (exception) {
-                return @{@"error": @(RJSStringForValue(_context, exception).c_str())};
+            return (json){{"error", RJSStringForValue(m_context, exception)}};
         }
-            return @{@"result": [self resultForJSValue:value]};
+        return (json){{"result", serialize_json_value(value)}};
     };
-        _requests["/set_property"] = [=](NSDictionary *dict) {
+    m_requests["/set_property"] = [this](const json dict) {
-            RPCObjectID oid = [dict[@"id"] unsignedLongValue];
+        RPCObjectID oid = dict["id"].get<RPCObjectID>();
-            id name = dict[@"name"];
+        json name = dict["name"];
-            JSValueRef value = [self deserializeDictionaryValue:dict[@"value"]];
+        JSValueRef value = deserialize_json_value(dict["value"]);
         JSValueRef exception = NULL;
 
-            if ([name isKindOfClass:[NSNumber class]]) {
+        if (name.is_number()) {
-                JSObjectSetPropertyAtIndex(_context, _objects[oid], [name unsignedIntValue], value, &exception);
+            JSObjectSetPropertyAtIndex(m_context, m_objects[oid], name.get<unsigned int>(), value, &exception);
         }
         else {
-                JSStringRef propString = RJSStringForString([name UTF8String]);
+            JSStringRef prop_string = RJSStringForString(name.get<std::string>());
-                JSObjectSetProperty(_context, _objects[oid], propString, value, 0, &exception);
+            JSObjectSetProperty(m_context, m_objects[oid], prop_string, value, 0, &exception);
-                JSStringRelease(propString);
+            JSStringRelease(prop_string);
         }
 
         if (exception) {
-                return @{@"error": @(RJSStringForValue(_context, exception).c_str())};
+            return (json){{"error", RJSStringForValue(m_context, exception)}};
         }
-            return @{};
+        return json::object();
     };
-        _requests["/dispose_object"] = [=](NSDictionary *dict) {
+    m_requests["/dispose_object"] = [this](const json dict) {
-            RPCObjectID oid = [dict[@"id"] unsignedLongValue];
+        RPCObjectID oid = dict["id"].get<RPCObjectID>();
-            JSValueUnprotect(_context, _objects[oid]);
+        JSValueUnprotect(m_context, m_objects[oid]);
-            _objects.erase(oid);
+        m_objects.erase(oid);
-            return nil;
+        return json::object();
     };
-        _requests["/clear_test_state"] = [=](NSDictionary *dict) {
+    m_requests["/clear_test_state"] = [this](const json dict) {
-            for (auto object : _objects) {
+        for (auto object : m_objects) {
             // The session ID points to the Realm constructor object, which should remain.
-                if (object.first == _sessionID) {
+            if (object.first == m_session_id) {
                 continue;
             }
 
-                JSValueUnprotect(_context, object.second);
+            JSValueUnprotect(m_context, object.second);
-                _objects.erase(object.first);
+            m_objects.erase(object.first);
         }
-            JSGarbageCollect(_context);
+        JSGarbageCollect(m_context);
         [RealmJS clearTestState];
-            return nil;
+        return json::object();
     };
 }
-    return self;
+
+RPCServer::~RPCServer() {
+    for (auto item : m_objects) {
+        JSValueUnprotect(m_context, item.second);
     }
 
-- (NSDictionary *)performRequest:(NSString *)name args:(NSDictionary *)args {
+    JSGlobalContextRelease(m_context);
-    // perform all realm ops on the main thread
+}
-    RPCRequest action = _requests[name.UTF8String];
+
+json RPCServer::perform_request(std::string name, json &args) {
+    try {
+        RPCRequest action = m_requests[name];
         assert(action);
 
-    __block id response;
+        if (name == "/create_session" || m_session_id == args["sessionId"].get<RPCObjectID>()) {
-    dispatch_sync(dispatch_get_main_queue(), ^{
+            return action(args);
-        if (_sessionID != [args[@"sessionId"] unsignedLongValue]) {
+        }
-            response = @{@"error": @"Invalid session ID"};
+        else {
-            return;
+            return {{"error", "Invalid session ID"}};
         }
-
-        try {
-            response = action(args);
     } catch (std::exception &exception) {
-            response = @{@"error": [@"exception thrown: " stringByAppendingString:@(exception.what())]};
+        return {{"error", (std::string)"exception thrown: " + exception.what()}};
     }
-    });
-    return response ?: @{};
 }
 
-- (NSDictionary *)performObjectMethod:(NSString *)method args:(NSArray *)args objectId:(RPCObjectID)oid {
+RPCObjectID RPCServer::store_object(JSObjectRef object) {
-    JSObjectRef object = _objects[oid];
-    JSStringRef methodString = RJSStringForString(method.UTF8String);
-    JSObjectRef function = RJSValidatedObjectProperty(_context, object, methodString);
-    JSStringRelease(methodString);
-
-    NSUInteger argCount = args.count;
-    JSValueRef argValues[argCount];
-    for (NSUInteger i = 0; i < argCount; i++) {
-        argValues[i] = [self deserializeDictionaryValue:args[i]];
-    }
-
-    JSValueRef exception = NULL;
-    JSValueRef result = JSObjectCallAsFunction(_context, function, object, argCount, argValues, &exception);
-
-    if (exception) {
-        return @{@"error": @(RJSStringForValue(_context, exception).c_str())};
-    }
-    return @{@"result": [self resultForJSValue:result]};
-}
-
-- (RPCObjectID)storeObject:(JSObjectRef)object {
     static RPCObjectID s_next_id = 1;
     RPCObjectID next_id = s_next_id++;
-    JSValueProtect(_context, object);
+    JSValueProtect(m_context, object);
-    _objects[next_id] = object;
+    m_objects[next_id] = object;
     return next_id;
 }
 
-- (NSDictionary *)resultForJSValue:(JSValueRef)value {
+json RPCServer::serialize_json_value(JSValueRef value) {
-    switch (JSValueGetType(_context, value)) {
+    switch (JSValueGetType(m_context, value)) {
         case kJSTypeUndefined:
-            return @{};
+            return json::object();
         case kJSTypeNull:
-            return @{@"value": [NSNull null]};
+            return {{"value", json(nullptr)}};
         case kJSTypeBoolean:
-            return @{@"value": @(JSValueToBoolean(_context, value))};
+            return {{"value", JSValueToBoolean(m_context, value)}};
         case kJSTypeNumber:
-            return @{@"value": @(JSValueToNumber(_context, value, NULL))};
+            return {{"value", JSValueToNumber(m_context, value, NULL)}};
         case kJSTypeString:
-            return @{@"value": @(RJSStringForValue(_context, value).c_str())};
+            return {{"value", RJSStringForValue(m_context, value)}};
         case kJSTypeObject:
             break;
     }
 
-    JSObjectRef jsObject = JSValueToObject(_context, value, NULL);
+    JSObjectRef js_object = JSValueToObject(m_context, value, NULL);
 
-    if (JSValueIsObjectOfClass(_context, value, RJSObjectClass())) {
+    if (JSValueIsObjectOfClass(m_context, value, RJSObjectClass())) {
-        realm::Object *object = RJSGetInternal<realm::Object *>(jsObject);
+        realm::Object *object = RJSGetInternal<realm::Object *>(js_object);
-        RPCObjectID oid = [self storeObject:jsObject];
+        return {
-        return @{
+            {"type", RJSTypeGet(realm::PropertyTypeObject)},
-             @"type": @(RJSTypeGet(realm::PropertyTypeObject).c_str()),
+            {"id", store_object(js_object)},
-             @"id": @(oid),
+            {"schema", serialize_object_schema(object->object_schema)}
-             @"schema": [self objectSchemaToJSONObject:object->object_schema]
         };
     }
-    else if (JSValueIsObjectOfClass(_context, value, RJSListClass())) {
+    else if (JSValueIsObjectOfClass(m_context, value, RJSListClass())) {
-        realm::List *list = RJSGetInternal<realm::List *>(jsObject);
+        realm::List *list = RJSGetInternal<realm::List *>(js_object);
-        RPCObjectID oid = [self storeObject:jsObject];
+        return {
-        return @{
+            {"type", RJSTypeGet(realm::PropertyTypeArray)},
-             @"type": @(RJSTypeGet(realm::PropertyTypeArray).c_str()),
+            {"id", store_object(js_object)},
-             @"id": @(oid),
+            {"size", list->link_view->size()},
-             @"size": @(list->link_view->size()),
+            {"schema", serialize_object_schema(list->object_schema)}
-             @"schema": [self objectSchemaToJSONObject:list->object_schema]
          };
     }
-    else if (JSValueIsObjectOfClass(_context, value, RJSResultsClass())) {
+    else if (JSValueIsObjectOfClass(m_context, value, RJSResultsClass())) {
-        realm::Results *results = RJSGetInternal<realm::Results *>(jsObject);
+        realm::Results *results = RJSGetInternal<realm::Results *>(js_object);
-        RPCObjectID oid = [self storeObject:jsObject];
+        return {
-        return @{
+            {"type", RealmObjectTypesResults},
-             @"type": @(RealmObjectTypesResults),
+            {"id", store_object(js_object)},
-             @"id": @(oid),
+            {"size", results->size()},
-             @"size": @(results->size()),
+            {"schema", serialize_object_schema(results->object_schema)}
-             @"schema": [self objectSchemaToJSONObject:results->object_schema]
         };
     }
-    else if (JSValueIsObjectOfClass(_context, value, RJSNotificationClass())) {
+    else if (JSValueIsObjectOfClass(m_context, value, RJSNotificationClass())) {
-        RPCObjectID oid = [self storeObject:jsObject];
+        return {
-        return @{
+            {"type", RealmObjectTypesNotification},
-            @"type": @(RealmObjectTypesNotification),
+            {"id", store_object(js_object)},
-            @"id": @(oid),
         };
     }
-    else if (RJSIsValueArray(_context, value)) {
+    else if (RJSIsValueArray(m_context, value)) {
-        size_t length = RJSValidatedListLength(_context, jsObject);
+        size_t length = RJSValidatedListLength(m_context, js_object);
-        NSMutableArray *array = [NSMutableArray new];
+        std::vector<json> array;
         for (unsigned int i = 0; i < length; i++) {
-            [array addObject:[self resultForJSValue:JSObjectGetPropertyAtIndex(_context, jsObject, i, NULL)]];
+            array.push_back(serialize_json_value(JSObjectGetPropertyAtIndex(m_context, js_object, i, NULL)));
         }
-        return @{@"value": array};
+        return {{"value", array}};
     }
-    else if (RJSIsValueDate(_context, value)) {
+    else if (RJSIsValueDate(m_context, value)) {
-        return @{
+        return {
-            @"type": @(RJSTypeGet(realm::PropertyTypeDate).c_str()),
+            {"type", RJSTypeGet(realm::PropertyTypeDate)},
-            @"value": @(RJSValidatedValueToNumber(_context, value)),
+            {"value", RJSValidatedValueToNumber(m_context, value)},
         };
     }
-    else {
     assert(0);
 }
+
+json RPCServer::serialize_object_schema(realm::ObjectSchema &object_schema) {
+    json properties = json::array();
+    for (realm::Property prop : object_schema.properties) {
+        properties.push_back({
+            {"name", prop.name},
+            {"type", RJSTypeGet(prop.type)},
+        });
     }
 
-- (NSDictionary *)objectSchemaToJSONObject:(realm::ObjectSchema &)objectSchema {
+    return {
-    NSMutableArray *properties = [[NSMutableArray alloc] init];
+        {"name", object_schema.name},
-
+        {"properties", properties},
-    for (realm::Property prop : objectSchema.properties) {
-        NSDictionary *dict = @{
-            @"name": @(prop.name.c_str()),
-            @"type": @(RJSTypeGet(prop.type).c_str()),
-        };
-
-        [properties addObject:dict];
-    }
-
-    return @{
-        @"name": @(objectSchema.name.c_str()),
-        @"properties": properties,
     };
 }
 
-- (JSValueRef)deserializeDictionaryValue:(NSDictionary *)dict {
+JSValueRef RPCServer::deserialize_json_value(const json dict)
-    RPCObjectID oid = [dict[@"id"] longValue];
+{
-    if (oid) {
+    json oid = dict["id"];
-        return _objects[oid];
+    if (oid.is_number()) {
+        return m_objects[oid.get<RPCObjectID>()];
     }
 
-    NSString *type = dict[@"type"];
+    json value = dict["value"];
-    id value = dict[@"value"];
+    json type = dict["type"];
-
+    if (type.is_string()) {
-    if ([type isEqualToString:@(RealmObjectTypesFunction)]) {
+        std::string type_string = type.get<std::string>();
+        if (type_string == RealmObjectTypesFunction) {
             // FIXME: Make this actually call the function by its id once we need it to.
-        JSStringRef jsBody = JSStringCreateWithUTF8CString("");
+            JSStringRef js_body = JSStringCreateWithUTF8CString("");
-        JSObjectRef jsFunction = JSObjectMakeFunction(_context, NULL, 0, NULL, jsBody, NULL, 1, NULL);
+            JSObjectRef js_function = JSObjectMakeFunction(m_context, NULL, 0, NULL, js_body, NULL, 1, NULL);
-        JSStringRelease(jsBody);
+            JSStringRelease(js_body);
 
-        return jsFunction;
+            return js_function;
         }
-    else if ([type isEqualToString:@(RJSTypeGet(realm::PropertyTypeDate).c_str())]) {
+        else if (type_string == RJSTypeGet(realm::PropertyTypeDate)) {
             JSValueRef exception = NULL;
-        JSValueRef time = JSValueMakeNumber(_context, [value doubleValue]);
+            JSValueRef time = JSValueMakeNumber(m_context, value.get<double>());
-        JSObjectRef date = JSObjectMakeDate(_context, 1, &time, &exception);
+            JSObjectRef date = JSObjectMakeDate(m_context, 1, &time, &exception);
 
             if (exception) {
-            throw RJSException(_context, exception);
+                throw RJSException(m_context, exception);
             }
             return date;
         }
-
-    if (!value) {
-        return JSValueMakeUndefined(_context);
-    }
-    else if ([value isKindOfClass:[NSNull class]]) {
-        return JSValueMakeNull(_context);
-    }
-    else if ([value isKindOfClass:[@YES class]]) {
-        return JSValueMakeBoolean(_context, [value boolValue]);
-    }
-    else if ([value isKindOfClass:[NSNumber class]]) {
-        return JSValueMakeNumber(_context, [value doubleValue]);
-    }
-    else if ([value isKindOfClass:[NSString class]]) {
-        return RJSValueForString(_context, std::string([value UTF8String]));
-    }
-    else if ([value isKindOfClass:[NSArray class]]) {
-        NSUInteger count = [value count];
-        JSValueRef jsValues[count];
-
-        for (NSUInteger i = 0; i < count; i++) {
-            jsValues[i] = [self deserializeDictionaryValue:value[i]];
     }
 
-        return JSObjectMakeArray(_context, count, jsValues, NULL);
+    if (value.is_null()) {
+        return JSValueMakeNull(m_context);
     }
-    else if ([value isKindOfClass:[NSDictionary class]]) {
+    else if (value.is_boolean()) {
-        JSObjectRef jsObject = JSObjectMake(_context, NULL, NULL);
+        return JSValueMakeBoolean(m_context, value.get<bool>());
+    }
+    else if (value.is_number()) {
+        return JSValueMakeNumber(m_context, value.get<double>());
+    }
+    else if (value.is_string()) {
+        return RJSValueForString(m_context, value.get<std::string>());
+    }
+    else if (value.is_array()) {
+        size_t count = value.size();
+        JSValueRef js_values[count];
 
-        for (NSString *key in value) {
+        for (size_t i = 0; i < count; i++) {
-            JSValueRef jsValue = [self deserializeDictionaryValue:value[key]];
+            js_values[i] = deserialize_json_value(value.at(i));
-            JSStringRef jsKey = JSStringCreateWithCFString((__bridge CFStringRef)key);
-
-            JSObjectSetProperty(_context, jsObject, jsKey, jsValue, 0, NULL);
-            JSStringRelease(jsKey);
         }
 
-        return jsObject;
+        return JSObjectMakeArray(m_context, count, js_values, NULL);
+    }
+    else if (value.is_object()) {
+        JSObjectRef js_object = JSObjectMake(m_context, NULL, NULL);
+
+        for (json::iterator it = value.begin(); it != value.end(); ++it) {
+            JSValueRef js_value = deserialize_json_value(it.value());
+            JSStringRef js_key = JSStringCreateWithUTF8CString(it.key().c_str());
+
+            JSObjectSetProperty(m_context, js_object, js_key, js_value, 0, NULL);
+            JSStringRelease(js_key);
         }
 
-    return JSValueMakeUndefined(_context);
+        return js_object;
     }
 
-@end
+    return JSValueMakeUndefined(m_context);
+}

tests/ReactTests/ios/ReactTestsTests/RealmReactTests.m

@@ -41,6 +41,7 @@ static id<RCTJavaScriptExecutor> s_currentJavaScriptExecutor;
     }
 
     s_currentJavaScriptExecutor = [bridge valueForKey:@"javaScriptExecutor"];
+    assert(s_currentJavaScriptExecutor);
     
     // FIXME: Remove this nonsense once the crashes go away when a test fails!
     JSGlobalContextRef ctx = RealmReactGetJSGlobalContextForExecutor(s_currentJavaScriptExecutor, false);