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#ifndef ENTCACHE_IMPL_H
#define ENTCACHE_IMPL_H
#include "entCache.h"
#include <boost/multi_index/member.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <boost/multi_index_container.hpp>
#include <exceptions.h>
#include <grp.h>
#include <lockHelpers.h>
#include <pwd.h>
#include <type_traits>
template<class entry_t>
class EntCache<entry_t>::Ids :
public boost::multi_index::multi_index_container<std::shared_ptr<entry_t>,
boost::multi_index::indexed_by<boost::multi_index::ordered_unique<boost::multi_index::tag<id_t>,
BOOST_MULTI_INDEX_MEMBER(entry_t, const id_t, id), std::less<>>,
boost::multi_index::ordered_unique<boost::multi_index::tag<std::string>,
BOOST_MULTI_INDEX_MEMBER(entry_t, const std::string, name), std::less<>>>> {
};
template<class entry_t> EntCache<entry_t>::EntCache() : idcache(std::make_unique<Ids>()) { }
template<class entry_t> EntCache<entry_t>::EntCache(entry_t fb) : idcache(std::make_unique<Ids>())
{
setFallback(std::move(fb));
}
template<class entry_t> EntCache<entry_t>::~EntCache() = default;
template<class entry_t>
ResolvedAs
EntCache<entry_t>::getID(const EntCache<entry_t>::name_t & u, EntCache<entry_t>::id_t * target) const
{
auto e = getEntry(u);
*target = e->id;
return e.resolution;
}
template<class entry_t>
ResolvedAs
EntCache<entry_t>::getName(const EntCache<entry_t>::id_t & u, EntCache<entry_t>::name_t * target) const
{
auto e = getEntry(u);
*target = e->name;
return e.resolution;
}
template<class entry_t>
EntCache<entry_t>::Resolution::Resolution(entry_ptr e, ResolvedAs res) : entry_ptr(std::move(e)), resolution(res)
{
}
template<class entry_t>
template<class key_t>
typename EntCache<entry_t>::Resolution
EntCache<entry_t>::getEntry(const key_t & key) const
{
SharedScopeLock(lock) {
if (fillTime + 60 > time(nullptr)) {
if (auto ent = getEntryNoFill<key_t>(key)) {
return ent;
}
}
}
ScopeLock(lock) {
fillCache();
if (auto ent = getEntryNoFill<key_t>(key)) {
return ent;
}
}
if (fallback) {
return {fallback, ResolvedAs::Fallback};
}
throw NetFS::SystemError(EPERM);
}
template<class entry_t>
template<class key_t>
typename EntCache<entry_t>::entry_ptr
EntCache<entry_t>::getEntryNoFill(const key_t & key) const
{
auto & collection = idcache->template get<key_t>();
auto i = collection.find(key);
if (i != collection.end()) {
return *i;
}
return nullptr;
}
template<typename entry_t>
void
EntCache<entry_t>::setFallback(entry_t fb)
{
fallback = std::make_shared<entry_t>(std::move(fb));
}
template<typename entry_t>
void
EntCache<entry_t>::clearFallback()
{
fallback.reset();
}
User::User(uid_t u, std::string n, gid_t g) : id(u), name(std::move(n)), group(g) { }
template<>
void
EntCache<User>::fillCache() const
{
setpwent();
idcache->clear();
std::array<char, BUFSIZ> buf {};
passwd pwbuf {}, *pwp;
while (getpwent_r(&pwbuf, buf.data(), buf.size(), &pwp) == 0) {
idcache->insert(std::make_shared<User>(pwp->pw_uid, pwp->pw_name, pwp->pw_gid));
}
endpwent();
time(&fillTime);
}
Group::Group(gid_t g, std::string n) : id(g), name(std::move(n)) { }
template<>
void
EntCache<Group>::fillCache() const
{
setgrent();
std::array<char, BUFSIZ> buf {};
idcache->clear();
group grpbuf {}, *grp;
EntCache<User> instance;
while (getgrent_r(&grpbuf, buf.data(), buf.size(), &grp) == 0) {
auto g = std::make_shared<Group>(grp->gr_gid, grp->gr_name);
for (auto member = grp->gr_mem; *member; member++) {
try {
g->members.insert(instance.getEntry((const name_t &)*member)->id);
}
catch (const NetFS::SystemError &) {
}
}
idcache->insert(std::move(g));
}
endgrent();
time(&fillTime);
}
bool
Group::hasMember(uid_t u) const
{
return (members.find(u) != members.end());
}
#endif
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