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#include "remote-fs-accessor.hh"
#include "nar-accessor.hh"
namespace nix {
RemoteFSAccessor::RemoteFSAccessor(ref<Store> store, const Path & cacheDir)
: store(store)
, cacheDir(cacheDir)
{
if (cacheDir != "")
createDirs(cacheDir);
}
Path RemoteFSAccessor::makeCacheFile(const Path & storePath)
{
assert(cacheDir != "");
return fmt("%s/%s.nar", cacheDir, storePathToHash(storePath));
}
void RemoteFSAccessor::addToCache(const Path & storePath, const std::string & nar)
{
try {
if (cacheDir == "") return;
/* FIXME: do this asynchronously. */
writeFile(makeCacheFile(storePath), nar);
} catch (...) {
ignoreException();
}
}
std::pair<ref<FSAccessor>, Path> RemoteFSAccessor::fetch(const Path & path_)
{
auto path = canonPath(path_);
auto storePath = store->toStorePath(path);
std::string restPath = std::string(path, storePath.size());
if (!store->isValidPath(storePath))
throw InvalidPath(format("path '%1%' is not a valid store path") % storePath);
auto i = nars.find(storePath);
if (i != nars.end()) return {i->second, restPath};
StringSink sink;
try {
if (cacheDir != "")
*sink.s = nix::readFile(makeCacheFile(storePath));
} catch (SysError &) { }
if (sink.s->empty()) {
store->narFromPath(storePath, sink);
addToCache(storePath, *sink.s);
}
auto accessor = makeNarAccessor(sink.s);
nars.emplace(storePath, accessor);
return {accessor, restPath};
}
FSAccessor::Stat RemoteFSAccessor::stat(const Path & path)
{
auto res = fetch(path);
return res.first->stat(res.second);
}
StringSet RemoteFSAccessor::readDirectory(const Path & path)
{
auto res = fetch(path);
return res.first->readDirectory(res.second);
}
std::string RemoteFSAccessor::readFile(const Path & path)
{
auto res = fetch(path);
return res.first->readFile(res.second);
}
std::string RemoteFSAccessor::readLink(const Path & path)
{
auto res = fetch(path);
return res.first->readLink(res.second);
}
}
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