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#ifndef FUSEAPP_H
#define FUSEAPP_H
#define FUSE_USE_VERSION 26
#include <fuse.h>
#include <typeinfo>
#include <exception>
#include <stdio.h>
#include <errno.h>
#include <syslog.h>
#include <misc.h>
#ifndef DLL_PUBLIC
#define DLL_PUBLIC __attribute__ ((visibility ("default")))
#endif
class DLL_PUBLIC FuseAppBase {
public:
FuseAppBase();
virtual ~FuseAppBase() = 0;
virtual void * init (struct fuse_conn_info * info);
virtual int opt_parse(void *, const char * arg, int key, struct fuse_args *);
virtual int access(const char *, int);
virtual int chmod(const char *, mode_t);
virtual int chown(const char *, uid_t, gid_t);
virtual int create(const char *, mode_t, struct fuse_file_info *);
virtual int fgetattr(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 ftruncate(const char *, off_t, struct fuse_file_info *);
virtual int getattr(const char *, struct stat *);
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 *);
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 *);
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 truncate(const char *, off_t);
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 *);
virtual int utimens(const char *, const struct timespec tv[2]);
virtual int bmap(const char *, size_t blocksize, uint64_t *idx);
virtual int ioctl(const char *, 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 int onError(const std::exception & err) throw();
virtual void log(int level, const std::string &) const throw() = 0;
virtual int fuse_opt_parse(struct fuse_args *args, void *data, const struct fuse_opt opts[], fuse_opt_proc_t proc) = 0;
virtual int main(int, char **, const struct fuse_operations *) = 0;
#define GetHelper(func) getHelper<&FuseAppBase::func>(typeid(&FuseAppBase::func) != typeid(&FuseApp::func))
template <typename FuseApp>
static int run(int argc, char ** argv, FuseApp * fa)
{
auto args = fa->runint(argc, argv);
struct fuse_operations operations = {
fuseCall<const char *, struct stat *>::GetHelper(getattr),
fuseCall<const char *, char *, size_t>::GetHelper(readlink),
NULL, // getdir deprecated
fuseCall<const char *, mode_t, dev_t>::GetHelper(mknod),
fuseCall<const char *, mode_t>::GetHelper(mkdir),
fuseCall<const char *>::GetHelper(unlink),
fuseCall<const char *>::GetHelper(rmdir),
fuseCall<const char *, const char *>::GetHelper(symlink),
fuseCall<const char *, const char *>::GetHelper(rename),
fuseCall<const char *, const char *>::GetHelper(link),
fuseCall<const char *, mode_t>::GetHelper(chmod),
fuseCall<const char *, uid_t, gid_t>::GetHelper(chown),
fuseCall<const char *, off_t>::GetHelper(truncate),
NULL, // utime deprecated
fuseCall<const char *, struct fuse_file_info *>::GetHelper(open),
fuseCall<const char *, char *, size_t, off_t, struct fuse_file_info *>::GetHelper(read),
fuseCall<const char *, const char *, size_t, off_t, struct fuse_file_info *>::GetHelper(write),
fuseCall<const char *, struct statvfs *>::GetHelper(statfs),
fuseCall<const char *, struct fuse_file_info *>::GetHelper(flush),
fuseCall<const char *, struct fuse_file_info *>::GetHelper(release),
fuseCall<const char *, int, struct fuse_file_info *>::GetHelper(fsync),
fuseCall<const char *, const char *, const char *, size_t, int>::GetHelper(setxattr),
fuseCall<const char *, const char *, char *, size_t>::GetHelper(getxattr),
fuseCall<const char *, char *, size_t>::GetHelper(listxattr),
fuseCall<const char *, const char *>::GetHelper(removexattr),
fuseCall<const char *, struct fuse_file_info *>::GetHelper(opendir),
fuseCall<const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *>::GetHelper(readdir),
fuseCall<const char *, struct fuse_file_info *>::GetHelper(releasedir),
fuseCall<const char *, int, struct fuse_file_info *>::GetHelper(fsyncdir),
fuseInit,
fuseDestroy,
fuseCall<const char *, int>::GetHelper(access),
fuseCall<const char *, mode_t, struct fuse_file_info *>::GetHelper(create),
fuseCall<const char *, off_t, struct fuse_file_info *>::GetHelper(ftruncate),
fuseCall<const char *, struct stat *, struct fuse_file_info *>::GetHelper(fgetattr),
#if (FUSE_MINOR_VERSION >= 6)
fuseCall<const char *, struct fuse_file_info *, int, struct flock *>::GetHelper(lock),
fuseCall<const char *, const struct timespec [2]>::GetHelper(utimens),
fuseCall<const char *, size_t, uint64_t *>::GetHelper(bmap),
#if (FUSE_MINOR_VERSION >= 8)
0, // flag_nullpath_ok
#if (FUSE_MINOR_VERSION >= 9)
0, // flag_nopath
0, // flag_utime_omit_ok
#endif
0, // flag_reserved
fuseCall<const char *, int, void *, struct fuse_file_info *, unsigned int, void *>::GetHelper(ioctl),
fuseCall<const char *, struct fuse_file_info *, struct fuse_pollhandle *, unsigned *>::GetHelper(poll),
#if (FUSE_MINOR_VERSION >= 9)
fuseCall<const char *, struct fuse_bufvec *, off_t, struct fuse_file_info *>::GetHelper(write_buf),
fuseCall<const char *, struct fuse_bufvec **, size_t, off_t, struct fuse_file_info *>::GetHelper(read_buf),
fuseCall<const char *, struct fuse_file_info *, int>::GetHelper(flock),
fuseCall<const char *, int, off_t, off_t, struct fuse_file_info *>::GetHelper(fallocate),
#endif
#endif
#endif
};
return fa->main(args.argc, args.argv, &operations);
}
struct fuse_args runint(int, char **);
private:
static void * fuseInit(struct fuse_conn_info *conn);
static void fuseDestroy(void *);
template <typename... Args>
class fuseCall {
public:
typedef int (*WrapperFunc)(Args...);
template <int (FuseAppBase::*b)(Args...)>
static WrapperFunc getHelper(bool implemented)
{
auto func = &helper<b>;
return implemented ? func : NULL;
}
template <int (FuseAppBase::*f)(Args...)>
static int helper(Args ... a)
{
try {
return (fuseApp->*f)(a...);
}
catch (const std::exception & ex) {
if (int rtn = fuseApp->onError(ex)) {
return rtn;
}
return helper<f>(a...);
}
catch (...) {
fuseApp->log(LOG_ERR, stringf("Unknown exception calling %s\n", typeid(f).name()));
return -ENOSYS;
}
}
};
static FuseAppBase * fuseApp;
};
#endif
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