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#include <mbgl/storage/default_file_source.hpp>
#include <mbgl/storage/asset_file_source.hpp>
#include <mbgl/storage/online_file_source.hpp>
#include <mbgl/storage/offline_database.hpp>
#include <mbgl/platform/platform.hpp>
#include <mbgl/util/url.hpp>
#include <mbgl/util/thread.hpp>
#include <mbgl/util/work_request.hpp>
#include <cassert>
namespace {
const std::string assetProtocol = "asset://";
bool isAssetURL(const std::string& url) {
return std::equal(assetProtocol.begin(), assetProtocol.end(), url.begin());
}
} // namespace
namespace mbgl {
class DefaultFileSource::Impl {
public:
class Task {
public:
Task(Resource resource, FileSource::Callback callback, DefaultFileSource::Impl* impl) {
auto offlineResponse = impl->offlineDatabase.get(resource);
Resource revalidation = resource;
if (offlineResponse) {
revalidation.priorModified = offlineResponse->modified;
revalidation.priorExpires = offlineResponse->expires;
revalidation.priorEtag = offlineResponse->etag;
callback(*offlineResponse);
}
if (!impl->offline) {
onlineRequest = impl->onlineFileSource.request(revalidation, [=] (Response onlineResponse) {
impl->offlineDatabase.put(revalidation, onlineResponse);
callback(onlineResponse);
});
}
}
std::unique_ptr<FileRequest> onlineRequest;
};
Impl(const std::string& cachePath)
: offlineDatabase(cachePath) {
}
void setAccessToken(const std::string& accessToken) {
onlineFileSource.setAccessToken(accessToken);
}
std::string getAccessToken() const {
return onlineFileSource.getAccessToken();
}
void add(FileRequest* req, Resource resource, Callback callback) {
tasks[req] = std::make_unique<Task>(resource, callback, this);
}
void cancel(FileRequest* req) {
tasks.erase(req);
}
void put(const Resource& resource, const Response& response) {
offlineDatabase.put(resource, response);
}
void goOffline() {
offline = true;
}
OfflineDatabase offlineDatabase;
OnlineFileSource onlineFileSource;
std::unordered_map<FileRequest*, std::unique_ptr<Task>> tasks;
bool offline = false;
};
class DefaultFileRequest : public FileRequest {
public:
DefaultFileRequest(Resource resource, FileSource::Callback callback, util::Thread<DefaultFileSource::Impl>& thread_)
: thread(thread_),
workRequest(thread.invokeWithCallback(&DefaultFileSource::Impl::add, callback, this, resource)) {
}
~DefaultFileRequest() {
thread.invoke(&DefaultFileSource::Impl::cancel, this);
}
util::Thread<DefaultFileSource::Impl>& thread;
std::unique_ptr<WorkRequest> workRequest;
};
DefaultFileSource::DefaultFileSource(const std::string& cachePath, const std::string& assetRoot)
: thread(std::make_unique<util::Thread<DefaultFileSource::Impl>>(util::ThreadContext{"DefaultFileSource", util::ThreadType::Unknown, util::ThreadPriority::Low}, cachePath)),
assetFileSource(std::make_unique<AssetFileSource>(assetRoot)) {
}
DefaultFileSource::~DefaultFileSource() = default;
void DefaultFileSource::setAccessToken(const std::string& accessToken) {
thread->invokeSync(&Impl::setAccessToken, accessToken);
}
std::string DefaultFileSource::getAccessToken() const {
return thread->invokeSync<std::string>(&Impl::getAccessToken);
}
void DefaultFileSource::setMaximumCacheSize(uint64_t) {
// TODO
}
void DefaultFileSource::setMaximumCacheEntrySize(uint64_t) {
// TODO
}
std::unique_ptr<FileRequest> DefaultFileSource::request(const Resource& resource, Callback callback) {
if (isAssetURL(resource.url)) {
return assetFileSource->request(resource, callback);
} else {
return std::make_unique<DefaultFileRequest>(resource, callback, *thread);
}
}
void DefaultFileSource::put(const Resource& resource, const Response& response) {
thread->invokeSync(&Impl::put, resource, response);
}
void DefaultFileSource::goOffline() {
thread->invokeSync(&Impl::goOffline);
}
} // namespace mbgl
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