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#pragma once
#include "types.hh"
#include "hash.hh"
#include <string>
#include <future>
namespace nix {
struct DownloadRequest
{
std::string uri;
std::string expectedETag;
bool verifyTLS = true;
bool head = false;
size_t tries = 5;
unsigned int baseRetryTimeMs = 250;
DownloadRequest(const std::string & uri) : uri(uri) { }
};
struct DownloadResult
{
bool cached = false;
std::string etag;
std::string effectiveUrl;
std::shared_ptr<std::string> data;
};
class Store;
struct Downloader
{
/* Enqueue a download request, returning a future to the result of
the download. The future may throw a DownloadError
exception. */
virtual void enqueueDownload(const DownloadRequest & request,
std::function<void(const DownloadResult &)> success,
std::function<void(std::exception_ptr exc)> failure) = 0;
std::future<DownloadResult> enqueueDownload(const DownloadRequest & request);
/* Synchronously download a file. */
DownloadResult download(const DownloadRequest & request);
/* Check if the specified file is already in ~/.cache/nix/tarballs
and is more recent than ‘tarball-ttl’ seconds. Otherwise,
use the recorded ETag to verify if the server has a more
recent version, and if so, download it to the Nix store. */
Path downloadCached(ref<Store> store, const string & uri, bool unpack, string name = "",
const Hash & expectedHash = Hash(), string * effectiveUri = nullptr);
enum Error { NotFound, Forbidden, Misc, Transient, Interrupted };
};
/* Return a shared Downloader object. Using this object is preferred
because it enables connection reuse and HTTP/2 multiplexing. */
ref<Downloader> getDownloader();
/* Return a new Downloader object. */
ref<Downloader> makeDownloader();
class DownloadError : public Error
{
public:
Downloader::Error error;
DownloadError(Downloader::Error error, const FormatOrString & fs)
: Error(fs), error(error)
{ }
};
bool isUri(const string & s);
/* Decode data according to the Content-Encoding header. */
ref<std::string> decodeContent(const std::string & encoding, ref<std::string> data);
}
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