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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "headless/lib/renderer/headless_content_renderer_client.h" | 5 #include "headless/lib/renderer/headless_content_renderer_client.h" |
6 | 6 |
7 #include "base/strings/utf_string_conversions.h" | |
8 #include "content/public/renderer/render_frame.h" | |
9 | |
7 namespace headless { | 10 namespace headless { |
8 | 11 |
9 HeadlessContentRendererClient::HeadlessContentRendererClient() {} | 12 HeadlessContentRendererClient::HeadlessContentRendererClient() {} |
10 | 13 |
11 HeadlessContentRendererClient::~HeadlessContentRendererClient() {} | 14 HeadlessContentRendererClient::~HeadlessContentRendererClient() {} |
12 | 15 |
16 void HeadlessContentRendererClient::RunScriptsAtDocumentStart( | |
17 content::RenderFrame* render_frame) { | |
18 render_frame->ExecuteJavaScript(base::UTF8ToUTF16(R"( | |
dcheng
2016/06/21 14:52:10
Raw string literals are still banned AFAIK.
alex clarke (OOO till 29th)
2016/06/21 16:15:17
Ah so they are :/ I got confused because they are
| |
19 // Shim to let code use define() instead of mojo.define() | |
20 window.define = (function() { | |
21 let moduleCache = new Map(); | |
22 return function(name, deps, factory) { | |
23 let promise = moduleCache.get(name); | |
24 if (promise === undefined) { | |
25 // This promise must be cached as mojo.define will only call the | |
26 // factory function the first time the module is defined. | |
27 promise = new Promise(resolve => { | |
28 mojo.define(name, deps, (...modules) => { | |
29 let result = factory(...modules); | |
30 return result; | |
31 }); | |
32 }); | |
33 moduleCache.set(name, promise); | |
34 } | |
35 return promise; | |
36 } | |
37 })(); | |
38 | |
39 // This code is run before the browser has sent us the mojo bindings so | |
40 // we need to get fancy and use nested proxy classes to define a promise | |
41 // to an arbitary window.mojo.services.myModule.myInterface. | |
42 if (window.hasOwnProperty("mojo")) { | |
43 let mojoBindings = new Map(); | |
44 let resolvePending = true; | |
45 | |
46 // Factory for returning the second level dynamic property which | |
47 // resolves to a promise to the corresponding mojo interface... | |
48 let interfaceProxyFactory = function(serviceName) { | |
49 return new Proxy({}, { | |
50 get: function(target, interfaceName) { | |
51 let name = serviceName + "::" + interfaceName; | |
52 let binding = mojoBindings.get(name); | |
53 if (binding === undefined) { | |
54 binding = {}; | |
55 binding.promise = new Promise(function(resolve, reject) { | |
56 binding.resolve = resolve; | |
57 binding.reject = reject; | |
58 if (!resolvePending) | |
59 reject(); | |
60 }); | |
61 mojoBindings.set(name, binding); | |
62 } | |
63 return binding.promise; | |
64 }, | |
65 set: function(target, name, value) { | |
66 throw new Error( | |
67 'Assignment to the mojo services proxy is not allowed'); | |
68 } | |
69 }); | |
70 }; | |
71 | |
72 // Top level dynamic property. | |
73 window.mojo.services = new Proxy({}, { | |
74 get: function(target, serviceName) { | |
75 if (!(serviceName in target)) { | |
76 let interfaceProxy = interfaceProxyFactory(serviceName); | |
77 target[serviceName] = interfaceProxy; | |
78 return interfaceProxy; | |
79 } | |
80 return target[serviceName]; | |
81 }, | |
82 set: function(target, name, value) { | |
83 throw new Error( | |
84 'Assignment to the mojo services proxy is not allowed'); | |
85 } | |
86 }); | |
87 | |
88 // Resolve promises for the listed |serviceNames|. | |
89 window.mojo.resolvePromisesForServices_ = function(serviceNames) { | |
90 let numServices = serviceNames.length; | |
91 for (let i = 0; i < numServices; ++i) { | |
92 let serviceName = serviceNames[i]; | |
93 // Use mojo to obtain the module binding. | |
94 define([ | |
95 serviceName, | |
96 "mojo/public/js/core", | |
97 "mojo/public/js/router", | |
98 "content/public/renderer/frame_service_registry", | |
99 ], function(serviceMojom, mojoCore, routerModule, | |
100 serviceProvider) { | |
101 // A mojom binding may contain bindings for a number of | |
102 // interfaces. Iterate through all of them and resolve any | |
103 // promises. | |
104 for (let m in serviceMojom) { | |
105 if (typeof serviceMojom[m] == "object") { | |
106 let service = serviceMojom[m]; | |
107 let binding = mojoBindings.get(service.name); | |
108 let interface = new service.proxyClass( | |
109 new routerModule.Router( | |
110 serviceProvider.connectToService(service.name))); | |
111 if (binding === undefined) { | |
112 // Store resolved promise in case binding is requested. | |
113 mojoBindings.set( | |
114 service.name, {"promise": Promise.resolve(interface)}); | |
115 } else { | |
116 binding.resolve(interface); | |
117 // Since this promise has been resolved we don't want to try | |
118 // and reject it below! | |
119 delete binding.reject; | |
120 } | |
121 } | |
122 } | |
123 }); | |
124 } | |
125 // Reject any remaining promises that didn't get resolved. | |
126 for (let [key, value] of mojoBindings) { | |
127 if ("reject" in value) { | |
128 value.reject(); | |
129 } | |
130 } | |
131 // Reject any subsequent unknown properties. | |
132 resolvePending = false; | |
133 }; | |
134 } )")); | |
135 } | |
136 | |
13 } // namespace headless | 137 } // namespace headless |
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