139 lines
3.9 KiB
C++
139 lines
3.9 KiB
C++
#pragma once
|
||
|
||
#include "types.hh"
|
||
#include "hash.hh"
|
||
#include "globals.hh"
|
||
|
||
#include <string>
|
||
#include <future>
|
||
|
||
namespace nix {
|
||
|
||
struct DownloadSettings : Config
|
||
{
|
||
Setting<bool> enableHttp2{this, true, "http2",
|
||
"Whether to enable HTTP/2 support."};
|
||
|
||
Setting<std::string> userAgentSuffix{this, "", "user-agent-suffix",
|
||
"String appended to the user agent in HTTP requests."};
|
||
|
||
Setting<size_t> httpConnections{this, 25, "http-connections",
|
||
"Number of parallel HTTP connections.",
|
||
{"binary-caches-parallel-connections"}};
|
||
|
||
Setting<unsigned long> connectTimeout{this, 0, "connect-timeout",
|
||
"Timeout for connecting to servers during downloads. 0 means use curl's builtin default."};
|
||
|
||
Setting<unsigned long> stalledDownloadTimeout{this, 300, "stalled-download-timeout",
|
||
"Timeout (in seconds) for receiving data from servers during download. Nix cancels idle downloads after this timeout's duration."};
|
||
|
||
Setting<unsigned int> tries{this, 5, "download-attempts",
|
||
"How often Nix will attempt to download a file before giving up."};
|
||
};
|
||
|
||
extern DownloadSettings downloadSettings;
|
||
|
||
struct DownloadRequest
|
||
{
|
||
std::string uri;
|
||
std::string expectedETag;
|
||
bool verifyTLS = true;
|
||
bool head = false;
|
||
size_t tries = downloadSettings.tries;
|
||
unsigned int baseRetryTimeMs = 250;
|
||
ActivityId parentAct;
|
||
bool decompress = true;
|
||
std::shared_ptr<std::string> data;
|
||
std::string mimeType;
|
||
std::function<void(char *, size_t)> dataCallback;
|
||
|
||
DownloadRequest(const std::string & uri)
|
||
: uri(uri), parentAct(getCurActivity()) { }
|
||
|
||
std::string verb()
|
||
{
|
||
return data ? "upload" : "download";
|
||
}
|
||
};
|
||
|
||
struct DownloadResult
|
||
{
|
||
bool cached = false;
|
||
std::string etag;
|
||
std::string effectiveUri;
|
||
std::shared_ptr<std::string> data;
|
||
uint64_t bodySize = 0;
|
||
};
|
||
|
||
struct CachedDownloadRequest
|
||
{
|
||
std::string uri;
|
||
bool unpack = false;
|
||
std::string name;
|
||
Hash expectedHash;
|
||
unsigned int ttl = settings.tarballTtl;
|
||
|
||
CachedDownloadRequest(const std::string & uri)
|
||
: uri(uri) { }
|
||
};
|
||
|
||
struct CachedDownloadResult
|
||
{
|
||
// Note: 'storePath' may be different from 'path' when using a
|
||
// chroot store.
|
||
Path storePath;
|
||
Path path;
|
||
std::optional<std::string> etag;
|
||
std::string effectiveUri;
|
||
};
|
||
|
||
class Store;
|
||
|
||
struct Downloader
|
||
{
|
||
virtual ~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,
|
||
Callback<DownloadResult> callback) = 0;
|
||
|
||
std::future<DownloadResult> enqueueDownload(const DownloadRequest & request);
|
||
|
||
/* Synchronously download a file. */
|
||
DownloadResult download(const DownloadRequest & request);
|
||
|
||
/* Download a file, writing its data to a sink. The sink will be
|
||
invoked on the thread of the caller. */
|
||
void download(DownloadRequest && request, Sink & sink);
|
||
|
||
/* 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. */
|
||
CachedDownloadResult downloadCached(ref<Store> store, const CachedDownloadRequest & request);
|
||
|
||
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);
|
||
|
||
}
|