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#include <mbgl/storage/asset_context_base.hpp>
#include <mbgl/storage/resource.hpp>
#include <mbgl/storage/response.hpp>
#include <mbgl/util/util.hpp>
#include <mbgl/util/url.hpp>
#include <mbgl/util/uv.hpp>
#include <mbgl/util/string.hpp>
#include <uv.h>
#include <cassert>
#include <limits>
namespace mbgl {
class AssetRequest : public RequestBase {
MBGL_STORE_THREAD(tid)
public:
AssetRequest(const Resource&, Callback, uv_loop_t*, const std::string& assetRoot);
~AssetRequest();
void cancel() final;
static void fileOpened(uv_fs_t *req);
static void fileStated(uv_fs_t *req);
static void fileRead(uv_fs_t *req);
static void fileClosed(uv_fs_t *req);
static void notifyError(uv_fs_t *req);
static void cleanup(uv_fs_t *req);
std::string assetRoot;
bool canceled = false;
uv_fs_t req;
uv_file fd = -1;
uv_buf_t buffer;
std::unique_ptr<Response> response;
};
class AssetFSContext : public AssetContextBase {
RequestBase* createRequest(const Resource& resource,
RequestBase::Callback callback,
uv_loop_t* loop,
const std::string& assetRoot) final {
return new AssetRequest(resource, callback, loop, assetRoot);
}
};
AssetRequest::~AssetRequest() {
MBGL_VERIFY_THREAD(tid);
}
AssetRequest::AssetRequest(const Resource& resource_, Callback callback_, uv_loop_t* loop, const std::string& assetRoot_)
: RequestBase(resource_, callback_),
assetRoot(assetRoot_) {
req.data = this;
const auto &url = resource.url;
std::string path;
if (url.size() <= 8 || url[8] == '/') {
// This is an empty or absolute path.
path = mbgl::util::percentDecode(url.substr(8));
} else {
// This is a relative path. Prefix with the application root.
path = assetRoot + "/" + mbgl::util::percentDecode(url.substr(8));
}
uv_fs_open(loop, &req, path.c_str(), O_RDONLY, S_IRUSR, fileOpened);
}
void AssetRequest::fileOpened(uv_fs_t *req) {
assert(req->data);
auto self = reinterpret_cast<AssetRequest *>(req->data);
MBGL_VERIFY_THREAD(self->tid);
if (req->result < 0) {
// Opening failed or was canceled. There isn't much left we can do.
notifyError(req);
cleanup(req);
} else {
const uv_file fd = uv_file(req->result);
// We're going to reuse this handle, so we need to cleanup first.
uv_fs_req_cleanup(req);
if (self->canceled) {
// The request was canceled.
uv_fs_close(req->loop, req, fd, fileClosed);
} else {
self->fd = fd;
uv_fs_fstat(req->loop, req, fd, fileStated);
}
}
}
void AssetRequest::fileStated(uv_fs_t *req) {
assert(req->data);
auto self = reinterpret_cast<AssetRequest *>(req->data);
MBGL_VERIFY_THREAD(self->tid);
if (req->result != 0 || self->canceled) {
// Stating failed or was canceled. We already have an open file handle
// though, which we'll have to close.
notifyError(req);
uv_fs_req_cleanup(req);
uv_fs_close(req->loop, req, self->fd, fileClosed);
} else {
#if UV_VERSION_MAJOR == 0 && UV_VERSION_MINOR <= 10
auto stat = static_cast<const uv_statbuf_t *>(req->ptr);
#else
auto stat = static_cast<const uv_stat_t *>(req->ptr);
#endif
if (stat->st_size > std::numeric_limits<int>::max()) {
// File is too large for us to open this way because uv_buf's only support unsigned
// ints as maximum size.
auto response = std::make_unique<Response>();
response->status = Response::Error;
#if UV_VERSION_MAJOR == 0 && UV_VERSION_MINOR <= 10
response->message = uv_strerror(uv_err_t {UV_EFBIG, 0});
#else
response->message = uv_strerror(UV_EFBIG);
#endif
self->notify(std::move(response), FileCache::Hint::No);
uv_fs_req_cleanup(req);
uv_fs_close(req->loop, req, self->fd, fileClosed);
} else {
self->response = std::make_unique<Response>();
#ifdef __APPLE__
self->response->modified = stat->st_mtimespec.tv_sec;
#else
self->response->modified = stat->st_mtime;
#endif
self->response->etag = util::toString(stat->st_ino);
const auto size = (unsigned int)(stat->st_size);
self->response->data.resize(size);
self->buffer = uv_buf_init(const_cast<char *>(self->response->data.data()), size);
uv_fs_req_cleanup(req);
#if UV_VERSION_MAJOR == 0 && UV_VERSION_MINOR <= 10
uv_fs_read(req->loop, req, self->fd, self->buffer.base, self->buffer.len, -1, fileRead);
#else
uv_fs_read(req->loop, req, self->fd, &self->buffer, 1, 0, fileRead);
#endif
}
}
}
void AssetRequest::fileRead(uv_fs_t *req) {
assert(req->data);
auto self = reinterpret_cast<AssetRequest *>(req->data);
MBGL_VERIFY_THREAD(self->tid);
if (req->result < 0 || self->canceled) {
// Stating failed or was canceled. We already have an open file handle
// though, which we'll have to close.
notifyError(req);
} else {
// File was successfully read.
self->response->status = Response::Successful;
self->notify(std::move(self->response), FileCache::Hint::No);
}
uv_fs_req_cleanup(req);
uv_fs_close(req->loop, req, self->fd, fileClosed);
}
void AssetRequest::fileClosed(uv_fs_t *req) {
assert(req->data);
auto self = reinterpret_cast<AssetRequest *>(req->data);
MBGL_VERIFY_THREAD(self->tid);
(void(self)); // Silence unused variable error in Release mode
if (req->result < 0) {
// Closing the file failed. But there isn't anything we can do.
}
cleanup(req);
}
void AssetRequest::notifyError(uv_fs_t *req) {
assert(req->data);
auto self = reinterpret_cast<AssetRequest *>(req->data);
MBGL_VERIFY_THREAD(self->tid);
if (req->result < 0 && !self->canceled && req->result != UV_ECANCELED) {
auto response = std::make_unique<Response>();
response->status = Response::Error;
response->message = uv::getFileRequestError(req);
self->notify(std::move(response), FileCache::Hint::No);
}
}
void AssetRequest::cleanup(uv_fs_t *req) {
assert(req->data);
auto self = reinterpret_cast<AssetRequest *>(req->data);
MBGL_VERIFY_THREAD(self->tid);
uv_fs_req_cleanup(req);
delete self;
}
void AssetRequest::cancel() {
canceled = true;
// uv_cancel fails frequently when the request has already been started.
// In that case, we have to let it complete and check the canceled bool
// instead. The cancelation callback will delete the AssetRequest object.
uv_cancel((uv_req_t *)&req);
}
std::unique_ptr<AssetContextBase> AssetContextBase::createContext(uv_loop_t*) {
return std::make_unique<AssetFSContext>();
}
}
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