forked from lix-project/lix
462421d345
This provides a pluggable mechanism for defining new fetchers. It adds
a builtin function 'fetchTree' that generalizes existing fetchers like
'fetchGit', 'fetchMercurial' and 'fetchTarball'. 'fetchTree' takes a
set of attributes, e.g.
fetchTree {
type = "git";
url = "https://example.org/repo.git";
ref = "some-branch";
rev = "abcdef...";
}
The existing fetchers are just wrappers around this. Note that the
input attributes to fetchTree are the same as flake input
specifications and flake lock file entries.
All fetchers share a common cache stored in
~/.cache/nix/fetcher-cache-v1.sqlite. This replaces the ad hoc caching
mechanisms in fetchGit and download.cc (e.g. ~/.cache/nix/{tarballs,git-revs*}).
This also adds support for Git worktrees (c169ea5904).
114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
#pragma once
|
|
|
|
#include "types.hh"
|
|
#include "hash.hh"
|
|
#include "config.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;
|
|
};
|
|
|
|
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);
|
|
|
|
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);
|
|
|
|
/* Resolve deprecated 'channel:<foo>' URLs. */
|
|
std::string resolveUri(const std::string & uri);
|
|
|
|
}
|