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Release underlying resources when JS instance in GC'ed (#24745)
Summary: Our Blob implementation was very problematic because it didn't release its underlying resource when the JS instance was dealocated. The main issue is that the fetch polyfill uses blobs by default if the module is available, which causes large memory leaks. This fixes it by using the new jsi infra to attach a `jsi::HostObject` (`BlobCollector`) to `Blob` instances. This way when the `Blob` is collected, the `BlobCollector` also gets collected. Using the `jsi::HostObject` dtor we can schedule the cleanup of native resources. This is definitely not the ideal solution but otherwise it would require rewriting the whole module using TurboModules + jsi. Fixes #23801, #20352, #21092 [General] [Fixed] - [Blob] Release underlying resources when JS instance in GC'ed Pull Request resolved: #24745 Reviewed By: fkgozali Differential Revision: D15248848 Pulled By: hramos fbshipit-source-id: 1da835cc935dfbf4e7bb6fbf2aea29bfdc9bd6fa
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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| /** | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
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| #import <jsi/jsi.h> | ||
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| using namespace facebook; | ||
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| @class RCTBlobManager; | ||
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| namespace facebook { | ||
| namespace react { | ||
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| class JSI_EXPORT RCTBlobCollector : public jsi::HostObject { | ||
| public: | ||
| RCTBlobCollector(RCTBlobManager *blobManager, const std::string &blobId); | ||
| ~RCTBlobCollector(); | ||
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| static void install(RCTBlobManager *blobManager); | ||
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| private: | ||
| const std::string blobId_; | ||
| RCTBlobManager *blobManager_; | ||
| }; | ||
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| } // namespace react | ||
| } // namespace facebook |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| /** | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
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| #import "RCTBlobCollector.h" | ||
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| #import <React/RCTBridge+Private.h> | ||
| #import "RCTBlobManager.h" | ||
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| namespace facebook { | ||
| namespace react { | ||
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| RCTBlobCollector::RCTBlobCollector(RCTBlobManager *blobManager, const std::string &blobId) | ||
| : blobId_(blobId), blobManager_(blobManager) {} | ||
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| RCTBlobCollector::~RCTBlobCollector() { | ||
| RCTBlobManager *blobManager = blobManager_; | ||
| NSString *blobId = [NSString stringWithUTF8String:blobId_.c_str()]; | ||
| dispatch_async([blobManager_ methodQueue], ^{ | ||
| [blobManager remove:blobId]; | ||
| }); | ||
| } | ||
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| void RCTBlobCollector::install(RCTBlobManager *blobManager) { | ||
| __weak RCTCxxBridge *cxxBridge = (RCTCxxBridge *)blobManager.bridge; | ||
| [cxxBridge dispatchBlock:^{ | ||
| if (!cxxBridge || cxxBridge.runtime == nullptr) { | ||
| return; | ||
| } | ||
| jsi::Runtime &runtime = *(jsi::Runtime *)cxxBridge.runtime; | ||
| runtime.global().setProperty( | ||
| runtime, | ||
| "__blobCollectorProvider", | ||
| jsi::Function::createFromHostFunction( | ||
| runtime, | ||
| jsi::PropNameID::forAscii(runtime, "__blobCollectorProvider"), | ||
| 1, | ||
| [blobManager](jsi::Runtime& rt, const jsi::Value& thisVal, const jsi::Value* args, size_t count) { | ||
| auto blobId = args[0].asString(rt).utf8(rt); | ||
| auto blobCollector = std::make_shared<RCTBlobCollector>(blobManager, blobId); | ||
| return jsi::Object::createFromHostObject(rt, blobCollector); | ||
| } | ||
| ) | ||
| ); | ||
| } queue:RCTJSThread]; | ||
| } | ||
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| } // namespace react | ||
| } // namespace facebook |
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