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#ifndef FUSEAPP_H
#define FUSEAPP_H
#include <c++11Helpers.h>
#include <cerrno>
#include <cstdio>
#include <exception>
#include <fuse.h>
#include <lockHelpers.h>
#include <shared_mutex>
#include <syslog.h>
#include <typeinfo>
#include <visibility.h>
class DLL_PUBLIC FuseAppBase {
public:
FuseAppBase();
SPECIAL_MEMBERS_DELETE(FuseAppBase);
virtual ~FuseAppBase();
virtual void * init(struct fuse_conn_info * info, struct fuse_config * cfg);
virtual int access(const char *, int);
virtual int chmod(const char *, mode_t, struct fuse_file_info *);
virtual int chown(const char *, uid_t, gid_t, struct fuse_file_info *);
virtual int create(const char *, mode_t, struct fuse_file_info *);
virtual int getattr(const char *, struct stat *, struct fuse_file_info *);
virtual int flush(const char *, struct fuse_file_info *);
virtual int fsync(const char *, int, struct fuse_file_info *);
virtual int fsyncdir(const char *, int, struct fuse_file_info *);
virtual int truncate(const char *, off_t, struct fuse_file_info *);
virtual int getxattr(const char *, const char *, char *, size_t);
virtual int link(const char *, const char *);
virtual int listxattr(const char *, char *, size_t);
virtual int mkdir(const char *, mode_t);
virtual int mknod(const char *, mode_t, dev_t);
virtual int open(const char *, struct fuse_file_info *);
virtual int opendir(const char *, struct fuse_file_info *);
virtual int read(const char *, char *, size_t, off_t, struct fuse_file_info *);
virtual int readdir(const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *, enum fuse_readdir_flags);
virtual int readlink(const char *, char *, size_t);
virtual int release(const char *, struct fuse_file_info *);
virtual int releasedir(const char *, struct fuse_file_info *);
virtual int removexattr(const char *, const char *);
virtual int rename(const char *, const char *, unsigned int);
virtual int rmdir(const char *);
virtual int setxattr(const char *, const char *, const char *, size_t, int);
virtual int statfs(const char *, struct statvfs *);
virtual int symlink(const char *, const char *);
virtual int unlink(const char *);
virtual int write(const char *, const char *, size_t, off_t, struct fuse_file_info *);
virtual int lock(const char *, struct fuse_file_info *, int cmd, struct flock *);
// NOLINTNEXTLINE(hicpp-avoid-c-arrays,modernize-avoid-c-arrays)
virtual int utimens(const char *, const struct timespec tv[2], struct fuse_file_info *);
virtual int bmap(const char *, size_t blocksize, uint64_t * idx);
virtual int ioctl(
const char *, unsigned int cmd, void * arg, struct fuse_file_info *, unsigned int flags, void * data);
virtual int poll(const char *, struct fuse_file_info *, struct fuse_pollhandle *, unsigned *);
virtual int write_buf(const char *, struct fuse_bufvec * buf, off_t off, struct fuse_file_info *);
virtual int read_buf(const char *, struct fuse_bufvec ** bufp, size_t size, off_t off, struct fuse_file_info *);
virtual int flock(const char *, struct fuse_file_info *, int op);
virtual int fallocate(const char *, int, off_t, off_t, struct fuse_file_info *);
virtual ssize_t copy_file_range(
const char *, struct fuse_file_info *, off_t, const char *, struct fuse_file_info *, off_t, size_t, int);
virtual off_t lseek(const char *, off_t off, int whence, struct fuse_file_info *);
virtual int onError(const std::exception & err) noexcept;
virtual void beforeOperation();
void log(int level, const char * message) const noexcept;
void logf(int level, const char * fmt, ...) const noexcept __attribute__((__format__(__printf__, 3, 4)));
virtual void vlogf(int level, const char * fmt, va_list) const noexcept
__attribute__((__format__(__printf__, 3, 0)))
= 0;
mutable std::shared_mutex _lock;
protected:
static FuseAppBase * fuseApp;
};
template<typename FuseApp> class FuseAppBaseT : public FuseAppBase {
public:
#define GetIntHelper(func) \
getInternalHelper<decltype(&FuseAppBase::func), decltype(&FuseApp::func), &FuseAppBase::func>(&FuseAppBase::func)
#define GetHelper(func) \
getHelper<decltype(&FuseAppBase::func), decltype(&FuseApp::func), &FuseAppBase::func>(&FuseAppBase::func)
FuseAppBaseT() :
operations({
GetHelper(getattr),
GetHelper(readlink),
GetHelper(mknod),
GetHelper(mkdir),
GetHelper(unlink),
GetHelper(rmdir),
GetHelper(symlink),
GetHelper(rename),
GetHelper(link),
GetHelper(chmod),
GetHelper(chown),
GetHelper(truncate),
GetHelper(open),
GetHelper(read),
GetHelper(write),
GetHelper(statfs),
GetHelper(flush),
GetHelper(release),
GetHelper(fsync),
GetHelper(setxattr),
GetHelper(getxattr),
GetHelper(listxattr),
GetHelper(removexattr),
GetHelper(opendir),
GetHelper(readdir),
GetHelper(releasedir),
GetHelper(fsyncdir),
GetIntHelper(init),
nullptr, // fuseDestroy
GetHelper(access),
GetHelper(create),
GetHelper(lock),
GetHelper(utimens),
GetHelper(bmap),
GetHelper(ioctl),
GetHelper(poll),
GetHelper(write_buf),
GetHelper(read_buf),
GetHelper(flock),
GetHelper(fallocate),
GetHelper(copy_file_range),
GetHelper(lseek),
})
{
}
#undef GetHelper
#undef GetIntHelper
const struct fuse_operations operations;
private:
template<typename BFunc, typename IFunc, BFunc bfunc, typename Rtn, typename... Args>
constexpr static auto getInternalHelper(Rtn (FuseAppBase::*)(Args...)) -> Rtn (*)(Args...)
{
if constexpr (!std::is_same<BFunc, IFunc>::value) {
return [](Args... a) {
SharedLock(fuseApp->_lock);
return (fuseApp->*bfunc)(a...);
};
}
return nullptr;
}
template<typename BFunc, typename IFunc, BFunc bfunc, typename Rtn, typename... Args>
constexpr static auto getHelper(Rtn (FuseAppBase::*)(Args...)) -> Rtn (*)(Args...)
{
if constexpr (!std::is_same<BFunc, IFunc>::value) {
return [](Args... a) -> Rtn {
for (int t = 0;; ++t) {
try {
fuseApp->beforeOperation();
SharedLock(fuseApp->_lock);
return (fuseApp->*bfunc)(a...);
}
catch (const std::exception & ex) {
if (t < 10) {
if (int rtn = fuseApp->onError(ex)) {
return rtn;
}
}
else {
fuseApp->logf(
LOG_ERR, "Retries expired with %s calling %s", ex.what(), typeid(bfunc).name());
return -EIO;
}
}
catch (...) {
fuseApp->logf(LOG_ERR, "Unknown exception calling %s", typeid(bfunc).name());
return -EIO;
}
}
};
}
return nullptr;
}
protected:
template<typename Func, Func f, typename... Args>
static int
internalHelper(Args... a)
{
return (fuseApp->*f)(a...);
}
};
#endif
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