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#include "binary-cache-store.hh"
#include "download.hh"
#include "globals.hh"
#include "nar-info-disk-cache.hh"
namespace nix {
class HttpBinaryCacheStore : public BinaryCacheStore
{
private:
Path cacheUri;
Pool<Downloader> downloaders;
public:
HttpBinaryCacheStore(std::shared_ptr<Store> localStore,
const StoreParams & params, const Path & _cacheUri)
: BinaryCacheStore(localStore, params)
, cacheUri(_cacheUri)
, downloaders(
std::numeric_limits<size_t>::max(),
[]() { return makeDownloader(); })
{
if (cacheUri.back() == '/')
cacheUri.pop_back();
diskCache = getNarInfoDiskCache();
}
std::string getUri() override
{
return cacheUri;
}
void init() override
{
// FIXME: do this lazily?
if (!diskCache->cacheExists(cacheUri)) {
if (!fileExists("nix-cache-info"))
throw Error(format("‘%s’ does not appear to be a binary cache") % cacheUri);
diskCache->createCache(cacheUri);
}
}
protected:
bool fileExists(const std::string & path) override
{
try {
auto downloader(downloaders.get());
DownloadOptions options;
options.showProgress = DownloadOptions::no;
options.head = true;
downloader->download(cacheUri + "/" + path, options);
return true;
} catch (DownloadError & e) {
/* S3 buckets return 403 if a file doesn't exist and the
bucket is unlistable, so treat 403 as 404. */
if (e.error == Downloader::NotFound || e.error == Downloader::Forbidden)
return false;
throw;
}
}
void upsertFile(const std::string & path, const std::string & data) override
{
throw Error("uploading to an HTTP binary cache is not supported");
}
std::shared_ptr<std::string> getFile(const std::string & path) override
{
auto downloader(downloaders.get());
DownloadOptions options;
options.showProgress = DownloadOptions::no;
try {
return downloader->download(cacheUri + "/" + path, options).data;
} catch (DownloadError & e) {
if (e.error == Downloader::NotFound || e.error == Downloader::Forbidden)
return 0;
throw;
}
}
};
static RegisterStoreImplementation regStore([](
const std::string & uri, const StoreParams & params)
-> std::shared_ptr<Store>
{
if (std::string(uri, 0, 7) != "http://" &&
std::string(uri, 0, 8) != "https://") return 0;
auto store = std::make_shared<HttpBinaryCacheStore>(std::shared_ptr<Store>(0),
params, uri);
store->init();
return store;
});
}
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