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18d45d1082
This function creates a nested event loop and runs a load() operation inside it, returning only once the load has either succeeded or failed. This will be used to implement blocking loads (ew!)
109 lines
3.8 KiB
C++
109 lines
3.8 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/SharedBuffer.h>
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#include <LibCore/EventLoop.h>
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#include <LibCore/File.h>
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#include <LibProtocol/Client.h>
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#include <LibProtocol/Download.h>
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#include <LibWeb/ResourceLoader.h>
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namespace Web {
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ResourceLoader& ResourceLoader::the()
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{
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static ResourceLoader* s_the;
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if (!s_the)
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s_the = &ResourceLoader::construct().leak_ref();
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return *s_the;
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}
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ResourceLoader::ResourceLoader()
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: m_protocol_client(Protocol::Client::construct())
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{
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}
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void ResourceLoader::load_sync(const URL& url, Function<void(const ByteBuffer&)> success_callback, Function<void(const String&)> error_callback)
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{
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Core::EventLoop loop;
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load(
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url,
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[&](auto& data) {
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success_callback(data);
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loop.quit(0);
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},
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[&](auto& string) {
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error_callback(string);
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loop.quit(0);
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});
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loop.exec();
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}
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void ResourceLoader::load(const URL& url, Function<void(const ByteBuffer&)> success_callback, Function<void(const String&)> error_callback)
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{
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if (url.protocol() == "file") {
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auto f = Core::File::construct();
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f->set_filename(url.path());
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if (!f->open(Core::IODevice::OpenMode::ReadOnly)) {
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dbg() << "ResourceLoader::load: Error: " << f->error_string();
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if (error_callback)
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error_callback(f->error_string());
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return;
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}
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auto data = f->read_all();
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deferred_invoke([data = move(data), success_callback = move(success_callback)](auto&) {
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success_callback(data);
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});
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return;
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}
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if (url.protocol() == "http") {
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auto download = protocol_client().start_download(url.to_string());
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download->on_finish = [this, success_callback = move(success_callback), error_callback = move(error_callback)](bool success, const ByteBuffer& payload, auto) {
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--m_pending_loads;
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if (on_load_counter_change)
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on_load_counter_change();
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if (!success) {
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if (error_callback)
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error_callback("HTTP load failed");
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return;
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}
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success_callback(ByteBuffer::copy(payload.data(), payload.size()));
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};
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++m_pending_loads;
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if (on_load_counter_change)
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on_load_counter_change();
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return;
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}
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if (error_callback)
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error_callback(String::format("Protocol not implemented: %s", url.protocol().characters()));
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}
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}
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