cef/libcef_dll/wrapper/cef_resource_manager.cc

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// Copyright (c) 2015 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.
#include "include/wrapper/cef_resource_manager.h"
#include <algorithm>
#include <vector>
#include "include/base/cef_callback.h"
#include "include/base/cef_weak_ptr.h"
#include "include/cef_parser.h"
#include "include/wrapper/cef_stream_resource_handler.h"
#include "include/wrapper/cef_zip_archive.h"
namespace {
#if defined(OS_WIN)
#define PATH_SEP '\\'
#else
#define PATH_SEP '/'
#endif
// Returns |url| without the query or fragment components, if any.
std::string GetUrlWithoutQueryOrFragment(const std::string& url) {
// Find the first instance of '?' or '#'.
const size_t pos = std::min(url.find('?'), url.find('#'));
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if (pos != std::string::npos) {
return url.substr(0, pos);
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}
return url;
}
// Determine the mime type based on the |url| file extension.
std::string GetMimeType(const std::string& url) {
std::string mime_type;
const std::string& url_without_query = GetUrlWithoutQueryOrFragment(url);
size_t sep = url_without_query.find_last_of(".");
if (sep != std::string::npos) {
mime_type = CefGetMimeType(url_without_query.substr(sep + 1));
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if (!mime_type.empty()) {
return mime_type;
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}
}
return "text/html";
}
// Default no-op filter.
std::string GetFilteredUrl(const std::string& url) {
return url;
}
// Provider of fixed contents.
class ContentProvider : public CefResourceManager::Provider {
public:
ContentProvider(const std::string& url,
const std::string& content,
const std::string& mime_type)
: url_(url), content_(content), mime_type_(mime_type) {
DCHECK(!url.empty());
DCHECK(!content.empty());
}
ContentProvider(const ContentProvider&) = delete;
ContentProvider& operator=(const ContentProvider&) = delete;
bool OnRequest(scoped_refptr<CefResourceManager::Request> request) override {
CEF_REQUIRE_IO_THREAD();
const std::string& url = request->url();
if (url != url_) {
// Not handled by this provider.
return false;
}
CefRefPtr<CefStreamReader> stream = CefStreamReader::CreateForData(
static_cast<void*>(const_cast<char*>(content_.data())),
content_.length());
// Determine the mime type a single time if it isn't already set.
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if (mime_type_.empty()) {
mime_type_ = request->mime_type_resolver().Run(url);
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}
request->Continue(new CefStreamResourceHandler(mime_type_, stream));
return true;
}
private:
std::string url_;
std::string content_;
std::string mime_type_;
};
// Provider of contents loaded from a directory on the file system.
class DirectoryProvider : public CefResourceManager::Provider {
public:
DirectoryProvider(const std::string& url_path,
const std::string& directory_path)
: url_path_(url_path), directory_path_(directory_path) {
DCHECK(!url_path_.empty());
DCHECK(!directory_path_.empty());
// Normalize the path values.
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if (url_path_[url_path_.size() - 1] != '/') {
url_path_ += '/';
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}
if (directory_path_[directory_path_.size() - 1] != PATH_SEP) {
directory_path_ += PATH_SEP;
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}
}
DirectoryProvider(const DirectoryProvider&) = delete;
DirectoryProvider& operator=(const DirectoryProvider&) = delete;
bool OnRequest(scoped_refptr<CefResourceManager::Request> request) override {
CEF_REQUIRE_IO_THREAD();
const std::string& url = request->url();
if (url.find(url_path_) != 0U) {
return false;
}
const std::string& file_path = GetFilePath(url);
// Open |file_path| on the FILE thread.
CefPostTask(TID_FILE_USER_BLOCKING,
base::BindOnce(&DirectoryProvider::OpenOnFileThread, file_path,
request));
return true;
}
private:
std::string GetFilePath(const std::string& url) {
std::string path_part = url.substr(url_path_.length());
#if defined(OS_WIN)
std::replace(path_part.begin(), path_part.end(), '/', '\\');
#endif
return directory_path_ + path_part;
}
static void OpenOnFileThread(
const std::string& file_path,
scoped_refptr<CefResourceManager::Request> request) {
CEF_REQUIRE_FILE_USER_BLOCKING_THREAD();
CefRefPtr<CefStreamReader> stream =
CefStreamReader::CreateForFile(file_path);
// Continue loading on the IO thread.
CefPostTask(TID_IO,
base::BindOnce(&DirectoryProvider::ContinueOpenOnIOThread,
request, stream));
}
static void ContinueOpenOnIOThread(
scoped_refptr<CefResourceManager::Request> request,
CefRefPtr<CefStreamReader> stream) {
CEF_REQUIRE_IO_THREAD();
CefRefPtr<CefStreamResourceHandler> handler;
if (stream.get()) {
handler = new CefStreamResourceHandler(
request->mime_type_resolver().Run(request->url()), stream);
}
request->Continue(handler);
}
std::string url_path_;
std::string directory_path_;
};
// Provider of contents loaded from an archive file.
class ArchiveProvider : public CefResourceManager::Provider {
public:
ArchiveProvider(const std::string& url_path,
const std::string& archive_path,
const std::string& password)
: url_path_(url_path),
archive_path_(archive_path),
password_(password),
archive_load_started_(false),
archive_load_ended_(false),
weak_ptr_factory_(this) {
DCHECK(!url_path_.empty());
DCHECK(!archive_path_.empty());
// Normalize the path values.
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if (url_path_[url_path_.size() - 1] != '/') {
url_path_ += '/';
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}
}
ArchiveProvider(const ArchiveProvider&) = delete;
ArchiveProvider& operator=(const ArchiveProvider&) = delete;
bool OnRequest(scoped_refptr<CefResourceManager::Request> request) override {
CEF_REQUIRE_IO_THREAD();
const std::string& url = request->url();
if (url.find(url_path_) != 0U) {
// Not handled by this provider.
return false;
}
if (!archive_load_started_) {
// Initiate archive loading and queue the pending request.
archive_load_started_ = true;
pending_requests_.push_back(request);
// Load the archive file on the FILE thread.
CefPostTask(TID_FILE_USER_BLOCKING,
base::BindOnce(&ArchiveProvider::LoadOnFileThread,
weak_ptr_factory_.GetWeakPtr(), archive_path_,
password_));
return true;
}
if (archive_load_started_ && !archive_load_ended_) {
// The archive load has already started. Queue the pending request.
pending_requests_.push_back(request);
return true;
}
// Archive loading is done.
return ContinueRequest(request);
}
private:
static void LoadOnFileThread(base::WeakPtr<ArchiveProvider> ptr,
const std::string& archive_path,
const std::string& password) {
CEF_REQUIRE_FILE_USER_BLOCKING_THREAD();
CefRefPtr<CefZipArchive> archive;
CefRefPtr<CefStreamReader> stream =
CefStreamReader::CreateForFile(archive_path);
if (stream.get()) {
archive = new CefZipArchive;
if (archive->Load(stream, password, true) == 0) {
DLOG(WARNING) << "Empty archive file: " << archive_path;
archive = nullptr;
}
} else {
DLOG(WARNING) << "Failed to load archive file: " << archive_path;
}
CefPostTask(TID_IO, base::BindOnce(&ArchiveProvider::ContinueOnIOThread,
ptr, archive));
}
void ContinueOnIOThread(CefRefPtr<CefZipArchive> archive) {
CEF_REQUIRE_IO_THREAD();
archive_load_ended_ = true;
archive_ = archive;
if (!pending_requests_.empty()) {
// Continue all pending requests.
PendingRequests::const_iterator it = pending_requests_.begin();
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for (; it != pending_requests_.end(); ++it) {
ContinueRequest(*it);
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}
pending_requests_.clear();
}
}
bool ContinueRequest(scoped_refptr<CefResourceManager::Request> request) {
CefRefPtr<CefResourceHandler> handler;
// |archive_| will be NULL if the archive file failed to load or was empty.
if (archive_.get()) {
const std::string& url = request->url();
const std::string& relative_path = url.substr(url_path_.length());
CefRefPtr<CefZipArchive::File> file = archive_->GetFile(relative_path);
if (file.get()) {
handler = new CefStreamResourceHandler(
request->mime_type_resolver().Run(url), file->GetStreamReader());
}
}
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if (!handler.get()) {
return false;
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}
request->Continue(handler);
return true;
}
std::string url_path_;
std::string archive_path_;
std::string password_;
bool archive_load_started_;
bool archive_load_ended_;
CefRefPtr<CefZipArchive> archive_;
// List of requests that are pending while the archive is being loaded.
using PendingRequests =
std::vector<scoped_refptr<CefResourceManager::Request>>;
PendingRequests pending_requests_;
// Must be the last member.
base::WeakPtrFactory<ArchiveProvider> weak_ptr_factory_;
};
} // namespace
// CefResourceManager::ProviderEntry implementation.
struct CefResourceManager::ProviderEntry {
ProviderEntry(Provider* provider, int order, const std::string& identifier)
: provider_(provider),
order_(order),
identifier_(identifier),
deletion_pending_(false) {}
std::unique_ptr<Provider> provider_;
int order_;
std::string identifier_;
// List of pending requests currently associated with this provider.
RequestList pending_requests_;
// True if deletion of this provider is pending.
bool deletion_pending_;
};
// CefResourceManager::RequestState implementation.
CefResourceManager::RequestState::~RequestState() {
// Always execute the callback.
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if (callback_.get()) {
callback_->Continue();
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}
}
// CefResourceManager::Request implementation.
void CefResourceManager::Request::Continue(
CefRefPtr<CefResourceHandler> handler) {
if (!CefCurrentlyOn(TID_IO)) {
CefPostTask(TID_IO, base::BindOnce(&CefResourceManager::Request::Continue,
this, handler));
return;
}
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if (!state_.get()) {
return;
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}
// Disassociate |state_| immediately so that Provider::OnRequestCanceled is
// not called unexpectedly if Provider::OnRequest calls this method and then
// calls CefResourceManager::Remove*.
CefPostTask(TID_IO,
base::BindOnce(&CefResourceManager::Request::ContinueOnIOThread,
std::move(state_), handler));
}
void CefResourceManager::Request::Stop() {
if (!CefCurrentlyOn(TID_IO)) {
CefPostTask(TID_IO,
base::BindOnce(&CefResourceManager::Request::Stop, this));
return;
}
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if (!state_.get()) {
return;
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}
// Disassociate |state_| immediately so that Provider::OnRequestCanceled is
// not called unexpectedly if Provider::OnRequest calls this method and then
// calls CefResourceManager::Remove*.
CefPostTask(TID_IO,
base::BindOnce(&CefResourceManager::Request::StopOnIOThread,
std::move(state_)));
}
CefResourceManager::Request::Request(std::unique_ptr<RequestState> state)
: state_(std::move(state)), params_(state_->params_) {
CEF_REQUIRE_IO_THREAD();
ProviderEntry* entry = *(state_->current_entry_pos_);
// Should not be on a deleted entry.
DCHECK(!entry->deletion_pending_);
// Add this request to the entry's pending request list.
entry->pending_requests_.push_back(this);
state_->current_request_pos_ = --entry->pending_requests_.end();
}
// Detaches and returns |state_| if the provider indicates that it will not
// handle the request. Note that |state_| may already be NULL if OnRequest
// executes a callback before returning, in which case execution will continue
// asynchronously in any case.
std::unique_ptr<CefResourceManager::RequestState>
CefResourceManager::Request::SendRequest() {
CEF_REQUIRE_IO_THREAD();
Provider* provider = (*state_->current_entry_pos_)->provider_.get();
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if (!provider->OnRequest(this)) {
return std::move(state_);
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}
return std::unique_ptr<RequestState>();
}
bool CefResourceManager::Request::HasState() {
CEF_REQUIRE_IO_THREAD();
return (state_.get() != nullptr);
}
// static
void CefResourceManager::Request::ContinueOnIOThread(
std::unique_ptr<RequestState> state,
CefRefPtr<CefResourceHandler> handler) {
CEF_REQUIRE_IO_THREAD();
// The manager may already have been deleted.
base::WeakPtr<CefResourceManager> manager = state->manager_;
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if (manager) {
manager->ContinueRequest(std::move(state), handler);
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}
}
// static
void CefResourceManager::Request::StopOnIOThread(
std::unique_ptr<RequestState> state) {
CEF_REQUIRE_IO_THREAD();
// The manager may already have been deleted.
base::WeakPtr<CefResourceManager> manager = state->manager_;
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if (manager) {
manager->StopRequest(std::move(state));
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}
}
// CefResourceManager implementation.
CefResourceManager::CefResourceManager()
: url_filter_(base::BindRepeating(GetFilteredUrl)),
mime_type_resolver_(base::BindRepeating(GetMimeType)) {}
CefResourceManager::~CefResourceManager() {
CEF_REQUIRE_IO_THREAD();
RemoveAllProviders();
// Delete all entryies now. Requests may still be pending but they will not
// call back into this manager due to the use of WeakPtr.
if (!providers_.empty()) {
ProviderEntryList::iterator it = providers_.begin();
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for (; it != providers_.end(); ++it) {
delete *it;
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}
providers_.clear();
}
}
void CefResourceManager::AddContentProvider(const std::string& url,
const std::string& content,
const std::string& mime_type,
int order,
const std::string& identifier) {
AddProvider(new ContentProvider(url, content, mime_type), order, identifier);
}
void CefResourceManager::AddDirectoryProvider(const std::string& url_path,
const std::string& directory_path,
int order,
const std::string& identifier) {
AddProvider(new DirectoryProvider(url_path, directory_path), order,
identifier);
}
void CefResourceManager::AddArchiveProvider(const std::string& url_path,
const std::string& archive_path,
const std::string& password,
int order,
const std::string& identifier) {
AddProvider(new ArchiveProvider(url_path, archive_path, password), order,
identifier);
}
void CefResourceManager::AddProvider(Provider* provider,
int order,
const std::string& identifier) {
DCHECK(provider);
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if (!provider) {
return;
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}
if (!CefCurrentlyOn(TID_IO)) {
CefPostTask(TID_IO, base::BindOnce(&CefResourceManager::AddProvider, this,
provider, order, identifier));
return;
}
std::unique_ptr<ProviderEntry> new_entry(
new ProviderEntry(provider, order, identifier));
if (providers_.empty()) {
providers_.push_back(new_entry.release());
return;
}
// Insert before the first entry with a higher |order| value.
ProviderEntryList::iterator it = providers_.begin();
for (; it != providers_.end(); ++it) {
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if ((*it)->order_ > order) {
break;
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}
}
providers_.insert(it, new_entry.release());
}
void CefResourceManager::RemoveProviders(const std::string& identifier) {
if (!CefCurrentlyOn(TID_IO)) {
CefPostTask(TID_IO, base::BindOnce(&CefResourceManager::RemoveProviders,
this, identifier));
return;
}
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if (providers_.empty()) {
return;
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}
ProviderEntryList::iterator it = providers_.begin();
while (it != providers_.end()) {
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if ((*it)->identifier_ == identifier) {
DeleteProvider(it, false);
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} else {
++it;
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}
}
}
void CefResourceManager::RemoveAllProviders() {
if (!CefCurrentlyOn(TID_IO)) {
CefPostTask(TID_IO,
base::BindOnce(&CefResourceManager::RemoveAllProviders, this));
return;
}
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if (providers_.empty()) {
return;
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}
ProviderEntryList::iterator it = providers_.begin();
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while (it != providers_.end()) {
DeleteProvider(it, true);
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}
}
void CefResourceManager::SetMimeTypeResolver(const MimeTypeResolver& resolver) {
if (!CefCurrentlyOn(TID_IO)) {
CefPostTask(TID_IO, base::BindOnce(&CefResourceManager::SetMimeTypeResolver,
this, resolver));
return;
}
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if (!resolver.is_null()) {
mime_type_resolver_ = resolver;
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} else {
mime_type_resolver_ = base::BindRepeating(GetMimeType);
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}
}
void CefResourceManager::SetUrlFilter(const UrlFilter& filter) {
if (!CefCurrentlyOn(TID_IO)) {
CefPostTask(TID_IO, base::BindOnce(&CefResourceManager::SetUrlFilter, this,
filter));
return;
}
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if (!filter.is_null()) {
url_filter_ = filter;
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} else {
url_filter_ = base::BindRepeating(GetFilteredUrl);
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}
}
cef_return_value_t CefResourceManager::OnBeforeResourceLoad(
CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request,
CefRefPtr<CefCallback> callback) {
CEF_REQUIRE_IO_THREAD();
// Find the first provider that is not pending deletion.
ProviderEntryList::iterator current_entry_pos = providers_.begin();
GetNextValidProvider(current_entry_pos);
if (current_entry_pos == providers_.end()) {
// No providers so continue the request immediately.
return RV_CONTINUE;
}
std::unique_ptr<RequestState> state(new RequestState);
if (!weak_ptr_factory_.get()) {
// WeakPtrFactory instances need to be created and destroyed on the same
// thread. This object performs most of its work on the IO thread and will
// be destroyed on the IO thread so, now that we're on the IO thread,
// properly initialize the WeakPtrFactory.
weak_ptr_factory_.reset(new base::WeakPtrFactory<CefResourceManager>(this));
}
state->manager_ = weak_ptr_factory_->GetWeakPtr();
state->callback_ = callback;
state->params_.url_ =
GetUrlWithoutQueryOrFragment(url_filter_.Run(request->GetURL()));
state->params_.browser_ = browser;
state->params_.frame_ = frame;
state->params_.request_ = request;
state->params_.url_filter_ = url_filter_;
state->params_.mime_type_resolver_ = mime_type_resolver_;
state->current_entry_pos_ = current_entry_pos;
// If the request is potentially handled we need to continue asynchronously.
return SendRequest(std::move(state)) ? RV_CONTINUE_ASYNC : RV_CONTINUE;
}
CefRefPtr<CefResourceHandler> CefResourceManager::GetResourceHandler(
CefRefPtr<CefBrowser> browser,
CefRefPtr<CefFrame> frame,
CefRefPtr<CefRequest> request) {
CEF_REQUIRE_IO_THREAD();
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if (pending_handlers_.empty()) {
return nullptr;
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}
CefRefPtr<CefResourceHandler> handler;
PendingHandlersMap::iterator it =
pending_handlers_.find(request->GetIdentifier());
if (it != pending_handlers_.end()) {
handler = it->second;
pending_handlers_.erase(it);
}
return handler;
}
// Send the request to providers in order until one potentially handles it or we
// run out of providers. Returns true if the request is potentially handled.
bool CefResourceManager::SendRequest(std::unique_ptr<RequestState> state) {
bool potentially_handled = false;
do {
// Should not be on the last provider entry.
DCHECK(state->current_entry_pos_ != providers_.end());
scoped_refptr<Request> request = new Request(std::move(state));
// Give the provider an opportunity to handle the request.
state = request->SendRequest();
if (state.get()) {
// The provider will not handle the request. Move to the next provider if
// any.
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if (!IncrementProvider(state.get())) {
StopRequest(std::move(state));
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}
} else {
potentially_handled = true;
}
} while (state.get());
return potentially_handled;
}
void CefResourceManager::ContinueRequest(
std::unique_ptr<RequestState> state,
CefRefPtr<CefResourceHandler> handler) {
CEF_REQUIRE_IO_THREAD();
if (handler.get()) {
// The request has been handled. Associate the request ID with the handler.
pending_handlers_.insert(
std::make_pair(state->params_.request_->GetIdentifier(), handler));
StopRequest(std::move(state));
} else {
// Move to the next provider if any.
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if (IncrementProvider(state.get())) {
SendRequest(std::move(state));
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} else {
StopRequest(std::move(state));
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}
}
}
void CefResourceManager::StopRequest(std::unique_ptr<RequestState> state) {
CEF_REQUIRE_IO_THREAD();
// Detach from the current provider.
DetachRequestFromProvider(state.get());
// Delete the state object and execute the callback.
state.reset();
}
// Move state to the next provider if any and return true if there are more
// providers.
bool CefResourceManager::IncrementProvider(RequestState* state) {
// Identify the next provider.
ProviderEntryList::iterator next_entry_pos = state->current_entry_pos_;
GetNextValidProvider(++next_entry_pos);
// Detach from the current provider.
DetachRequestFromProvider(state);
if (next_entry_pos != providers_.end()) {
// Update the state to reference the new provider entry.
state->current_entry_pos_ = next_entry_pos;
return true;
}
return false;
}
// The new provider, if any, should be determined before calling this method.
void CefResourceManager::DetachRequestFromProvider(RequestState* state) {
if (state->current_entry_pos_ != providers_.end()) {
// Remove the association from the current provider entry.
ProviderEntryList::iterator current_entry_pos = state->current_entry_pos_;
ProviderEntry* current_entry = *(current_entry_pos);
current_entry->pending_requests_.erase(state->current_request_pos_);
if (current_entry->deletion_pending_ &&
current_entry->pending_requests_.empty()) {
// Delete the current provider entry now.
providers_.erase(current_entry_pos);
delete current_entry;
}
// Set to the end for error checking purposes.
state->current_entry_pos_ = providers_.end();
}
}
// Move to the next provider that is not pending deletion.
void CefResourceManager::GetNextValidProvider(
ProviderEntryList::iterator& iterator) {
while (iterator != providers_.end() && (*iterator)->deletion_pending_) {
++iterator;
}
}
void CefResourceManager::DeleteProvider(ProviderEntryList::iterator& iterator,
bool stop) {
CEF_REQUIRE_IO_THREAD();
ProviderEntry* current_entry = *(iterator);
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if (current_entry->deletion_pending_) {
return;
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}
if (!current_entry->pending_requests_.empty()) {
// Don't delete the provider entry until all pending requests have cleared.
current_entry->deletion_pending_ = true;
// Continue pending requests immediately.
RequestList::iterator it = current_entry->pending_requests_.begin();
for (; it != current_entry->pending_requests_.end(); ++it) {
const scoped_refptr<Request>& request = *it;
if (request->HasState()) {
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if (stop) {
request->Stop();
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} else {
request->Continue(nullptr);
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}
current_entry->provider_->OnRequestCanceled(request);
}
}
++iterator;
} else {
// Delete the provider entry now.
iterator = providers_.erase(iterator);
delete current_entry;
}
}