lix/src/libstore/filetransfer.hh

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#pragma once
#include "types.hh"
#include "hash.hh"
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#include "config.hh"
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#include <string>
#include <future>
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namespace nix {
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struct FileTransferSettings : 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",
R"(
The maximum number of parallel TCP connections used to fetch
files from binary caches and by other downloads. It defaults
to 25. 0 means no limit.
)",
{"binary-caches-parallel-connections"}};
Setting<unsigned long> connectTimeout{
this, 0, "connect-timeout",
R"(
The timeout (in seconds) for establishing connections in the
binary cache substituter. It corresponds to `curl`s
`--connect-timeout` option.
)"};
Setting<unsigned long> stalledDownloadTimeout{
this, 300, "stalled-download-timeout",
R"(
The 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."};
};
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extern FileTransferSettings fileTransferSettings;
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struct FileTransferRequest
{
std::string uri;
Headers headers;
std::string expectedETag;
bool verifyTLS = true;
bool head = false;
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size_t tries = fileTransferSettings.tries;
unsigned int baseRetryTimeMs = 250;
ActivityId parentAct;
bool decompress = true;
std::optional<std::string> data;
std::string mimeType;
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std::function<void(std::string_view data)> dataCallback;
FileTransferRequest(std::string_view uri)
: uri(uri), parentAct(getCurActivity()) { }
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std::string verb()
{
return data ? "upload" : "download";
}
};
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struct FileTransferResult
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{
bool cached = false;
std::string etag;
std::string effectiveUri;
std::string data;
uint64_t bodySize = 0;
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};
class Store;
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struct FileTransfer
{
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virtual ~FileTransfer() { }
/* Enqueue a data transfer request, returning a future to the result of
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the download. The future may throw a FileTransferError
exception. */
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virtual void enqueueFileTransfer(const FileTransferRequest & request,
Callback<FileTransferResult> callback) = 0;
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std::future<FileTransferResult> enqueueFileTransfer(const FileTransferRequest & request);
/* Synchronously download a file. */
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FileTransferResult download(const FileTransferRequest & request);
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/* Synchronously upload a file. */
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FileTransferResult upload(const FileTransferRequest & request);
/* Download a file, writing its data to a sink. The sink will be
invoked on the thread of the caller. */
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void download(FileTransferRequest && request, Sink & sink);
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enum Error { NotFound, Forbidden, Misc, Transient, Interrupted };
};
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/* Return a shared FileTransfer object. Using this object is preferred
because it enables connection reuse and HTTP/2 multiplexing. */
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ref<FileTransfer> getFileTransfer();
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/* Return a new FileTransfer object. */
ref<FileTransfer> makeFileTransfer();
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class FileTransferError : public Error
{
public:
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FileTransfer::Error error;
std::optional<string> response; // intentionally optional
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template<typename... Args>
FileTransferError(FileTransfer::Error error, std::optional<string> response, const Args & ... args);
virtual const char* sname() const override { return "FileTransferError"; }
};
bool isUri(const string & s);
/* Resolve deprecated 'channel:<foo>' URLs. */
std::string resolveUri(const std::string & uri);
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}