mirror of
https://github.com/privatevoid-net/nix-super.git
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114 lines
3.2 KiB
C++
114 lines
3.2 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 DataTransferSettings : 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{this, 25, "http-connections",
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"Number of parallel HTTP connections.",
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{"binary-caches-parallel-connections"}};
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Setting<unsigned long> connectTimeout{this, 0, "connect-timeout",
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"Timeout for connecting to servers during downloads. 0 means use curl's builtin default."};
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Setting<unsigned long> stalledDownloadTimeout{this, 300, "stalled-download-timeout",
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"Timeout (in seconds) for receiving data from servers during download. Nix cancels idle downloads after this timeout's duration."};
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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 DataTransferSettings dataTransferSettings;
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struct DataTransferRequest
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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 = dataTransferSettings.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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DataTransferRequest(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 DataTransferResult
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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 Downloader
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{
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virtual ~Downloader() { }
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/* Enqueue a download request, returning a future to the result of
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the download. The future may throw a DownloadError
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exception. */
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virtual void enqueueDataTransfer(const DataTransferRequest & request,
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Callback<DataTransferResult> callback) = 0;
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std::future<DataTransferResult> enqueueDataTransfer(const DataTransferRequest & request);
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/* Synchronously download a file. */
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DataTransferResult download(const DataTransferRequest & 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(DataTransferRequest && 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 Downloader object. Using this object is preferred
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because it enables connection reuse and HTTP/2 multiplexing. */
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ref<Downloader> getDownloader();
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/* Return a new Downloader object. */
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ref<Downloader> makeDownloader();
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class DownloadError : public Error
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{
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public:
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Downloader::Error error;
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DownloadError(Downloader::Error error, const FormatOrString & fs)
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: Error(fs), error(error)
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{ }
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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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