forked from lix-project/lix
135 lines
3.8 KiB
C++
135 lines
3.8 KiB
C++
#pragma once
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#include "types.hh"
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#include "hash.hh"
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#include "config.hh"
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#include <string>
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#include <future>
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namespace nix {
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struct FileTransferSettings : Config
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{
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Setting<bool> enableHttp2{this, true, "http2",
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"Whether to enable HTTP/2 support."};
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Setting<std::string> userAgentSuffix{this, "", "user-agent-suffix",
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"String appended to the user agent in HTTP requests."};
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Setting<size_t> httpConnections{
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this, 25, "http-connections",
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R"(
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The maximum number of parallel TCP connections used to fetch
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files from binary caches and by other downloads. It defaults
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to 25. 0 means no limit.
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)",
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{"binary-caches-parallel-connections"}};
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Setting<unsigned long> connectTimeout{
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this, 0, "connect-timeout",
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R"(
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The timeout (in seconds) for establishing connections in the
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binary cache substituter. It corresponds to `curl`’s
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`--connect-timeout` option.
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)"};
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Setting<unsigned long> stalledDownloadTimeout{
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this, 300, "stalled-download-timeout",
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R"(
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The timeout (in seconds) for receiving data from servers
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during download. Nix cancels idle downloads after this
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timeout's duration.
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)"};
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Setting<unsigned int> tries{this, 5, "download-attempts",
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"How often Nix will attempt to download a file before giving up."};
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};
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extern FileTransferSettings fileTransferSettings;
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struct FileTransferRequest
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{
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std::string uri;
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std::string expectedETag;
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bool verifyTLS = true;
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bool head = false;
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size_t tries = fileTransferSettings.tries;
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unsigned int baseRetryTimeMs = 250;
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ActivityId parentAct;
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bool decompress = true;
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std::shared_ptr<std::string> data;
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std::string mimeType;
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std::function<void(char *, size_t)> dataCallback;
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FileTransferRequest(const std::string & uri)
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: uri(uri), parentAct(getCurActivity()) { }
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std::string verb()
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{
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return data ? "upload" : "download";
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}
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};
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struct FileTransferResult
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{
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bool cached = false;
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std::string etag;
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std::string effectiveUri;
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std::shared_ptr<std::string> data;
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uint64_t bodySize = 0;
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};
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class Store;
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struct FileTransfer
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{
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virtual ~FileTransfer() { }
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/* Enqueue a data transfer request, returning a future to the result of
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the download. The future may throw a FileTransferError
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exception. */
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virtual void enqueueFileTransfer(const FileTransferRequest & request,
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Callback<FileTransferResult> callback) = 0;
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std::future<FileTransferResult> enqueueFileTransfer(const FileTransferRequest & request);
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/* 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);
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/* Download a file, writing its data to a sink. The sink will be
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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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};
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/* Return a shared FileTransfer object. Using this object is preferred
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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. */
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ref<FileTransfer> makeFileTransfer();
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class FileTransferError : public Error
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{
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public:
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FileTransfer::Error error;
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std::shared_ptr<string> response; // intentionally optional
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template<typename... Args>
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FileTransferError(FileTransfer::Error error, std::shared_ptr<string> response, const Args & ... args);
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virtual const char* sname() const override { return "FileTransferError"; }
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};
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bool isUri(const string & s);
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/* Resolve deprecated 'channel:<foo>' URLs. */
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std::string resolveUri(const std::string & uri);
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}
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