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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef MOJO_EDK_JS_DRAIN_DATA_H_ | |
6 #define MOJO_EDK_JS_DRAIN_DATA_H_ | |
7 | |
8 #include "base/memory/scoped_vector.h" | |
9 #include "gin/runner.h" | |
10 #include "mojo/public/c/environment/async_waiter.h" | |
11 #include "mojo/public/cpp/system/core.h" | |
12 #include "v8/include/v8.h" | |
13 | |
14 namespace mojo { | |
15 namespace js { | |
16 | |
17 // This class is the implementation of the Mojo JavaScript core module's | |
18 // drainData() method. It is not intended to be used directly. The caller | |
19 // allocates a DrainData on the heap and returns GetPromise() to JS. The | |
20 // implementation deletes itself after reading as much data as possible | |
21 // and rejecting or resolving the Promise. | |
22 | |
23 class DrainData { | |
24 public: | |
25 // Starts waiting for data on the specified data pipe consumer handle. | |
26 // See WaitForData(). The constructor does not block. | |
27 DrainData(v8::Isolate* isolate, mojo::Handle handle); | |
28 | |
29 // Returns a Promise that will be settled when no more data can be read. | |
30 // Should be called just once on a newly allocated DrainData object. | |
31 v8::Handle<v8::Value> GetPromise(); | |
32 | |
33 private: | |
34 ~DrainData(); | |
35 | |
36 // Registers an "async waiter" that calls DataReady() via WaitCompleted(). | |
37 void WaitForData(); | |
38 static void WaitCompleted(void* self, MojoResult result) { | |
39 static_cast<DrainData*>(self)->DataReady(result); | |
40 } | |
41 | |
42 // Use ReadData() to read whatever is availble now on handle_ and save | |
43 // it in data_buffers_. | |
44 void DataReady(MojoResult result); | |
45 MojoResult ReadData(); | |
46 | |
47 // When the remote data pipe handle is closed, or an error occurs, deliver | |
48 // all of the buffered data to the JS Promise and then delete this. | |
49 void DeliverData(MojoResult result); | |
50 | |
51 typedef std::vector<char> DataBuffer; | |
52 | |
53 v8::Isolate* isolate_; | |
54 ScopedDataPipeConsumerHandle handle_; | |
55 MojoAsyncWaitID wait_id_; | |
56 base::WeakPtr<gin::Runner> runner_; | |
57 v8::UniquePersistent<v8::Promise::Resolver> resolver_; | |
58 ScopedVector<DataBuffer> data_buffers_; | |
59 }; | |
60 | |
61 } // namespace js | |
62 } // namespace mojo | |
63 | |
64 #endif // MOJO_EDK_JS_DRAIN_DATA_H_ | |
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