mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-11 00:36:20 +02:00
c137c0a5eb
In particular, this allows more relevant activities ("substituting X")
to supersede inferior ones ("downloading X").
80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
#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;
|
||
ActivityId parentAct;
|
||
|
||
DownloadRequest(const std::string & uri)
|
||
: uri(uri), parentAct(curActivity) { }
|
||
};
|
||
|
||
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);
|
||
|
||
}
|