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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/storage/offline_download.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);
}
onlineRequest = impl->onlineFileSource.request(revalidation, [=] (Response onlineResponse) {
impl->offlineDatabase.put(revalidation, onlineResponse);
callback(onlineResponse);
});
}
std::unique_ptr<FileRequest> onlineRequest;
};
Impl(const std::string& cachePath, uint64_t maximumCacheSize)
: offlineDatabase(cachePath, maximumCacheSize) {
}
void setAccessToken(const std::string& accessToken) {
onlineFileSource.setAccessToken(accessToken);
}
std::string getAccessToken() const {
return onlineFileSource.getAccessToken();
}
void listRegions(std::function<void (std::exception_ptr, optional<std::vector<OfflineRegion>>)> callback) {
try {
callback({}, offlineDatabase.listRegions());
} catch (...) {
callback(std::current_exception(), {});
}
}
void createRegion(const OfflineRegionDefinition& definition,
const OfflineRegionMetadata& metadata,
std::function<void (std::exception_ptr, optional<OfflineRegion>)> callback) {
try {
callback({}, offlineDatabase.createRegion(definition, metadata));
} catch (...) {
callback(std::current_exception(), {});
}
}
void getRegionStatus(int64_t regionID, std::function<void (std::exception_ptr, optional<OfflineRegionStatus>)> callback) {
try {
callback({}, getDownload(regionID).getStatus());
} catch (...) {
callback(std::current_exception(), {});
}
}
void deleteRegion(OfflineRegion&& region, std::function<void (std::exception_ptr)> callback) {
try {
offlineDatabase.deleteRegion(std::move(region));
callback({});
} catch (...) {
callback(std::current_exception());
}
}
void setRegionObserver(int64_t regionID, std::unique_ptr<OfflineRegionObserver> observer) {
getDownload(regionID).setObserver(std::move(observer));
}
void setRegionDownloadState(int64_t regionID, OfflineRegionDownloadState state) {
getDownload(regionID).setState(state);
}
void request(FileRequest* req, Resource resource, Callback callback) {
tasks[req] = std::make_unique<Task>(resource, callback, this);
}
void cancel(FileRequest* req) {
tasks.erase(req);
}
void setOfflineMapboxTileCountLimit(uint64_t limit) {
offlineDatabase.setOfflineMapboxTileCountLimit(limit);
}
void put(const Resource& resource, const Response& response) {
offlineDatabase.put(resource, response);
}
private:
OfflineDownload& getDownload(int64_t regionID) {
auto it = downloads.find(regionID);
if (it != downloads.end()) {
return *it->second;
}
return *downloads.emplace(regionID,
std::make_unique<OfflineDownload>(regionID, offlineDatabase.getRegionDefinition(regionID), offlineDatabase, onlineFileSource)).first->second;
}
OfflineDatabase offlineDatabase;
OnlineFileSource onlineFileSource;
std::unordered_map<FileRequest*, std::unique_ptr<Task>> tasks;
std::unordered_map<int64_t, std::unique_ptr<OfflineDownload>> downloads;
};
DefaultFileSource::DefaultFileSource(const std::string& cachePath,
const std::string& assetRoot,
uint64_t maximumCacheSize)
: thread(std::make_unique<util::Thread<Impl>>(util::ThreadContext{"DefaultFileSource", util::ThreadType::Unknown, util::ThreadPriority::Low},
cachePath, maximumCacheSize)),
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);
}
std::unique_ptr<FileRequest> DefaultFileSource::request(const Resource& resource, Callback callback) {
class DefaultFileRequest : public FileRequest {
public:
DefaultFileRequest(Resource resource_, FileSource::Callback callback_, util::Thread<DefaultFileSource::Impl>& thread_)
: thread(thread_),
workRequest(thread.invokeWithCallback(&DefaultFileSource::Impl::request, callback_, this, resource_)) {
}
~DefaultFileRequest() {
thread.invoke(&DefaultFileSource::Impl::cancel, this);
}
util::Thread<DefaultFileSource::Impl>& thread;
std::unique_ptr<WorkRequest> workRequest;
};
if (isAssetURL(resource.url)) {
return assetFileSource->request(resource, callback);
} else {
return std::make_unique<DefaultFileRequest>(resource, callback, *thread);
}
}
void DefaultFileSource::listOfflineRegions(std::function<void (std::exception_ptr, optional<std::vector<OfflineRegion>>)> callback) {
thread->invoke(&Impl::listRegions, callback);
}
void DefaultFileSource::createOfflineRegion(const OfflineRegionDefinition& definition,
const OfflineRegionMetadata& metadata,
std::function<void (std::exception_ptr, optional<OfflineRegion>)> callback) {
thread->invoke(&Impl::createRegion, definition, metadata, callback);
}
void DefaultFileSource::deleteOfflineRegion(OfflineRegion&& region, std::function<void (std::exception_ptr)> callback) {
thread->invoke(&Impl::deleteRegion, std::move(region), callback);
}
void DefaultFileSource::setOfflineRegionObserver(OfflineRegion& region, std::unique_ptr<OfflineRegionObserver> observer) {
thread->invoke(&Impl::setRegionObserver, region.getID(), std::move(observer));
}
void DefaultFileSource::setOfflineRegionDownloadState(OfflineRegion& region, OfflineRegionDownloadState state) {
thread->invoke(&Impl::setRegionDownloadState, region.getID(), state);
}
void DefaultFileSource::getOfflineRegionStatus(OfflineRegion& region, std::function<void (std::exception_ptr, optional<OfflineRegionStatus>)> callback) const {
thread->invoke(&Impl::getRegionStatus, region.getID(), callback);
}
void DefaultFileSource::setOfflineMapboxTileCountLimit(uint64_t limit) const {
thread->invokeSync(&Impl::setOfflineMapboxTileCountLimit, limit);
}
// For testing only:
void DefaultFileSource::put(const Resource& resource, const Response& response) {
thread->invokeSync(&Impl::put, resource, response);
}
} // namespace mbgl
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