Enable HTTP/2 support
The binary cache store can now use HTTP/2 to do lookups. This is much more efficient than HTTP/1.1 due to multiplexing: we can issue many requests in parallel over a single TCP connection. Thus it's no longer necessary to use a bunch of concurrent TCP connections (25 by default). For example, downloading 802 .narinfo files from https://cache.nixos.org/, using a single TCP connection, takes 11.8s with HTTP/1.1, but only 0.61s with HTTP/2. This did require a fairly substantial rewrite of the Downloader class to use the curl multi interface, because otherwise curl wouldn't be able to do multiplexing for us. As a bonus, we get connection reuse even with HTTP/1.1. All downloads are now handled by a single worker thread. Clients call Downloader::enqueueDownload() to tell the worker thread to start the download, getting a std::future to the result.
This commit is contained in:
parent
a75d11a7e6
commit
90ad02bf62
9 changed files with 433 additions and 210 deletions
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@ -55,7 +55,7 @@ bool parseSearchPathArg(Strings::iterator & i,
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Path lookupFileArg(EvalState & state, string s)
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Path lookupFileArg(EvalState & state, string s)
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{
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{
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if (isUri(s))
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if (isUri(s))
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return makeDownloader()->downloadCached(state.store, s, true);
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return getDownloader()->downloadCached(state.store, s, true);
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else if (s.size() > 2 && s.at(0) == '<' && s.at(s.size() - 1) == '>') {
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else if (s.size() > 2 && s.at(0) == '<' && s.at(s.size() - 1) == '>') {
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Path p = s.substr(1, s.size() - 2);
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Path p = s.substr(1, s.size() - 2);
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return state.findFile(p);
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return state.findFile(p);
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@ -662,7 +662,7 @@ std::pair<bool, std::string> EvalState::resolveSearchPathElem(const SearchPathEl
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// FIXME: support specifying revision/branch
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// FIXME: support specifying revision/branch
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res = { true, exportGit(store, elem.second, "master") };
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res = { true, exportGit(store, elem.second, "master") };
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else
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else
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res = { true, makeDownloader()->downloadCached(store, elem.second, true) };
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res = { true, getDownloader()->downloadCached(store, elem.second, true) };
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} catch (DownloadError & e) {
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} catch (DownloadError & e) {
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printMsg(lvlError, format("warning: Nix search path entry ‘%1%’ cannot be downloaded, ignoring") % elem.second);
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printMsg(lvlError, format("warning: Nix search path entry ‘%1%’ cannot be downloaded, ignoring") % elem.second);
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res = { false, "" };
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res = { false, "" };
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@ -1769,7 +1769,7 @@ void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
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if (state.restricted && !expectedHash)
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if (state.restricted && !expectedHash)
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throw Error(format("‘%1%’ is not allowed in restricted mode") % who);
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throw Error(format("‘%1%’ is not allowed in restricted mode") % who);
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Path res = makeDownloader()->downloadCached(state.store, url, unpack, name, expectedHash);
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Path res = getDownloader()->downloadCached(state.store, url, unpack, name, expectedHash);
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mkString(v, res, PathSet({res}));
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mkString(v, res, PathSet({res}));
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}
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}
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@ -17,13 +17,15 @@ void builtinFetchurl(const BasicDerivation & drv)
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auto fetch = [&](const string & url) {
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auto fetch = [&](const string & url) {
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/* No need to do TLS verification, because we check the hash of
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/* No need to do TLS verification, because we check the hash of
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the result anyway. */
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the result anyway. */
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DownloadOptions options;
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DownloadRequest request(url);
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options.verifyTLS = false;
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request.verifyTLS = false;
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/* Show a progress indicator, even though stderr is not a tty. */
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/* Show a progress indicator, even though stderr is not a tty. */
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options.showProgress = DownloadOptions::yes;
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request.showProgress = DownloadRequest::yes;
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auto data = makeDownloader()->download(url, options);
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/* Note: have to use a fresh downloader here because we're in
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a forked process. */
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auto data = makeDownloader()->download(request);
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assert(data.data);
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assert(data.data);
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return data.data;
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return data.data;
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@ -5,10 +5,15 @@
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#include "store-api.hh"
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#include "store-api.hh"
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#include "archive.hh"
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#include "archive.hh"
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#include <unistd.h>
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#include <fcntl.h>
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#include <curl/curl.h>
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#include <curl/curl.h>
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#include <iostream>
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#include <iostream>
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#include <thread>
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#include <thread>
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#include <cmath>
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#include <random>
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namespace nix {
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namespace nix {
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@ -30,225 +35,428 @@ std::string resolveUri(const std::string & uri)
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struct CurlDownloader : public Downloader
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struct CurlDownloader : public Downloader
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{
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{
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CURL * curl;
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CURLM * curlm = 0;
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ref<std::string> data;
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string etag, status, expectedETag, effectiveUrl;
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struct curl_slist * requestHeaders;
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std::random_device rd;
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std::mt19937 mt19937;
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bool showProgress;
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struct DownloadItem : public std::enable_shared_from_this<DownloadItem>
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double prevProgressTime{0}, startTime{0};
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unsigned int moveBack{1};
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size_t writeCallback(void * contents, size_t size, size_t nmemb)
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{
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{
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size_t realSize = size * nmemb;
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CurlDownloader & downloader;
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data->append((char *) contents, realSize);
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DownloadRequest request;
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return realSize;
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DownloadResult result;
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}
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bool done = false; // whether the promise has been set
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std::promise<DownloadResult> promise;
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CURL * req = 0;
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bool active = false; // whether the handle has been added to the multi object
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std::string status;
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static size_t writeCallbackWrapper(void * contents, size_t size, size_t nmemb, void * userp)
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bool showProgress = false;
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{
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double prevProgressTime{0}, startTime{0};
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return ((CurlDownloader *) userp)->writeCallback(contents, size, nmemb);
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unsigned int moveBack{1};
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}
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size_t headerCallback(void * contents, size_t size, size_t nmemb)
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unsigned int attempt = 0;
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{
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size_t realSize = size * nmemb;
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/* Don't start this download until the specified time point
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string line = string((char *) contents, realSize);
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has been reached. */
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printMsg(lvlVomit, format("got header: %1%") % trim(line));
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std::chrono::steady_clock::time_point embargo;
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if (line.compare(0, 5, "HTTP/") == 0) { // new response starts
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etag = "";
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struct curl_slist * requestHeaders = 0;
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auto ss = tokenizeString<vector<string>>(line, " ");
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status = ss.size() >= 2 ? ss[1] : "";
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DownloadItem(CurlDownloader & downloader, const DownloadRequest & request)
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} else {
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: downloader(downloader), request(request)
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auto i = line.find(':');
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{
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if (i != string::npos) {
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showProgress =
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string name = trim(string(line, 0, i));
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request.showProgress == DownloadRequest::yes ||
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if (name == "ETag") { // FIXME: case
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(request.showProgress == DownloadRequest::automatic && isatty(STDERR_FILENO));
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etag = trim(string(line, i + 1));
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/* Hack to work around a GitHub bug: it sends
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if (!request.expectedETag.empty())
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ETags, but ignores If-None-Match. So if we get
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requestHeaders = curl_slist_append(requestHeaders, ("If-None-Match: " + request.expectedETag).c_str());
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the expected ETag on a 200 response, then shut
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}
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down the connection because we already have the
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data. */
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~DownloadItem()
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printMsg(lvlDebug, format("got ETag: %1%") % etag);
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{
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if (etag == expectedETag && status == "200") {
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if (req) {
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printMsg(lvlDebug, format("shutting down on 200 HTTP response with expected ETag"));
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if (active)
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return 0;
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curl_multi_remove_handle(downloader.curlm, req);
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curl_easy_cleanup(req);
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}
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if (requestHeaders) curl_slist_free_all(requestHeaders);
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try {
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if (!done)
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fail(DownloadError(Transient, format("download of ‘%s’ was interrupted") % request.uri));
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} catch (...) {
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ignoreException();
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}
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}
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template<class T>
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void fail(const T & e)
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{
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promise.set_exception(std::make_exception_ptr(e));
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done = true;
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}
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size_t writeCallback(void * contents, size_t size, size_t nmemb)
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{
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size_t realSize = size * nmemb;
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result.data->append((char *) contents, realSize);
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return realSize;
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}
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static size_t writeCallbackWrapper(void * contents, size_t size, size_t nmemb, void * userp)
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{
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return ((DownloadItem *) userp)->writeCallback(contents, size, nmemb);
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}
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size_t headerCallback(void * contents, size_t size, size_t nmemb)
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{
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size_t realSize = size * nmemb;
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std::string line((char *) contents, realSize);
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printMsg(lvlVomit, format("got header for ‘%s’: %s") % request.uri % trim(line));
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if (line.compare(0, 5, "HTTP/") == 0) { // new response starts
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result.etag = "";
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auto ss = tokenizeString<vector<string>>(line, " ");
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status = ss.size() >= 2 ? ss[1] : "";
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result.data = std::make_shared<std::string>();
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} else {
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auto i = line.find(':');
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if (i != string::npos) {
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string name = toLower(trim(string(line, 0, i)));
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if (name == "etag") {
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result.etag = trim(string(line, i + 1));
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/* Hack to work around a GitHub bug: it sends
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ETags, but ignores If-None-Match. So if we get
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the expected ETag on a 200 response, then shut
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down the connection because we already have the
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data. */
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if (result.etag == request.expectedETag && status == "200") {
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debug(format("shutting down on 200 HTTP response with expected ETag"));
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return 0;
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}
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}
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}
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}
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}
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}
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}
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return realSize;
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}
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}
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return realSize;
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}
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static size_t headerCallbackWrapper(void * contents, size_t size, size_t nmemb, void * userp)
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static size_t headerCallbackWrapper(void * contents, size_t size, size_t nmemb, void * userp)
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{
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{
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return ((CurlDownloader *) userp)->headerCallback(contents, size, nmemb);
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return ((DownloadItem *) userp)->headerCallback(contents, size, nmemb);
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}
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}
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int progressCallback(double dltotal, double dlnow)
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int progressCallback(double dltotal, double dlnow)
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{
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{
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if (showProgress) {
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if (showProgress) {
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double now = getTime();
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double now = getTime();
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if (prevProgressTime <= now - 1) {
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if (prevProgressTime <= now - 1) {
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string s = (format(" [%1$.0f/%2$.0f KiB, %3$.1f KiB/s]")
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string s = (format(" [%1$.0f/%2$.0f KiB, %3$.1f KiB/s]")
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% (dlnow / 1024.0)
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% (dlnow / 1024.0)
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% (dltotal / 1024.0)
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% (dltotal / 1024.0)
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% (now == startTime ? 0 : dlnow / 1024.0 / (now - startTime))).str();
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% (now == startTime ? 0 : dlnow / 1024.0 / (now - startTime))).str();
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std::cerr << "\e[" << moveBack << "D" << s;
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std::cerr << "\e[" << moveBack << "D" << s;
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moveBack = s.size();
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moveBack = s.size();
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std::cerr.flush();
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prevProgressTime = now;
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}
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}
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return _isInterrupted;
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}
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static int progressCallbackWrapper(void * userp, double dltotal, double dlnow, double ultotal, double ulnow)
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{
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return ((DownloadItem *) userp)->progressCallback(dltotal, dlnow);
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}
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void init()
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{
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// FIXME: handle parallel downloads.
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if (showProgress) {
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std::cerr << (format("downloading ‘%1%’... ") % request.uri);
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std::cerr.flush();
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std::cerr.flush();
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prevProgressTime = now;
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startTime = getTime();
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}
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if (!req) req = curl_easy_init();
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curl_easy_reset(req);
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curl_easy_setopt(req, CURLOPT_URL, request.uri.c_str());
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curl_easy_setopt(req, CURLOPT_FOLLOWLOCATION, 1L);
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curl_easy_setopt(req, CURLOPT_NOSIGNAL, 1);
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curl_easy_setopt(req, CURLOPT_USERAGENT, ("Nix/" + nixVersion).c_str());
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curl_easy_setopt(req, CURLOPT_PIPEWAIT, 1);
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curl_easy_setopt(req, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2TLS);
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curl_easy_setopt(req, CURLOPT_WRITEFUNCTION, DownloadItem::writeCallbackWrapper);
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curl_easy_setopt(req, CURLOPT_WRITEDATA, this);
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curl_easy_setopt(req, CURLOPT_HEADERFUNCTION, DownloadItem::headerCallbackWrapper);
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curl_easy_setopt(req, CURLOPT_HEADERDATA, this);
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curl_easy_setopt(req, CURLOPT_PROGRESSFUNCTION, progressCallbackWrapper);
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curl_easy_setopt(req, CURLOPT_PROGRESSDATA, this);
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curl_easy_setopt(req, CURLOPT_NOPROGRESS, 0);
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curl_easy_setopt(req, CURLOPT_HTTPHEADER, requestHeaders);
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if (request.head)
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curl_easy_setopt(req, CURLOPT_NOBODY, 1);
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if (request.verifyTLS)
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curl_easy_setopt(req, CURLOPT_CAINFO, getEnv("SSL_CERT_FILE", "/etc/ssl/certs/ca-certificates.crt").c_str());
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else {
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curl_easy_setopt(req, CURLOPT_SSL_VERIFYPEER, 0);
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curl_easy_setopt(req, CURLOPT_SSL_VERIFYHOST, 0);
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}
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result.data = std::make_shared<std::string>();
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}
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void finish(CURLcode code)
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{
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if (showProgress)
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//std::cerr << "\e[" << moveBack << "D\e[K\n";
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std::cerr << "\n";
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long httpStatus = 0;
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curl_easy_getinfo(req, CURLINFO_RESPONSE_CODE, &httpStatus);
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char * effectiveUrlCStr;
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curl_easy_getinfo(req, CURLINFO_EFFECTIVE_URL, &effectiveUrlCStr);
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if (effectiveUrlCStr)
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result.effectiveUrl = effectiveUrlCStr;
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debug(format("finished download of ‘%s’; curl status = %d, HTTP status = %d, body = %d bytes")
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% request.uri % code % httpStatus % (result.data ? result.data->size() : 0));
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if (code == CURLE_WRITE_ERROR && result.etag == request.expectedETag) {
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code = CURLE_OK;
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httpStatus = 304;
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}
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if (code == CURLE_OK &&
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(httpStatus == 200 || httpStatus == 304 || httpStatus == 226 /* FTP */ || httpStatus == 0 /* other protocol */))
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{
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result.cached = httpStatus == 304;
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promise.set_value(result);
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done = true;
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} else {
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Error err =
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(httpStatus == 404 || code == CURLE_FILE_COULDNT_READ_FILE) ? NotFound :
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httpStatus == 403 ? Forbidden :
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(httpStatus == 408 || httpStatus == 500 || httpStatus == 503
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|| httpStatus == 504 || httpStatus == 522 || httpStatus == 524
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|| code == CURLE_COULDNT_RESOLVE_HOST) ? Transient :
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Misc;
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attempt++;
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auto exc =
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httpStatus != 0
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? DownloadError(err, format("unable to download ‘%s’: HTTP error %d") % request.uri % httpStatus)
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: DownloadError(err, format("unable to download ‘%s’: %s (%d)") % request.uri % curl_easy_strerror(code) % code);
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/* If this is a transient error, then maybe retry the
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download after a while. */
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if (err == Transient && attempt < request.tries) {
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int ms = request.baseRetryTimeMs * std::pow(2.0f, attempt - 1 + std::uniform_real_distribution<>(0.0, 0.5)(downloader.mt19937));
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printMsg(lvlError, format("warning: %s; retrying in %d ms") % exc.what() % ms);
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embargo = std::chrono::steady_clock::now() + std::chrono::milliseconds(ms);
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downloader.enqueueItem(shared_from_this());
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}
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else
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fail(exc);
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}
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}
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}
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}
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return _isInterrupted;
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};
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}
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|
||||||
static int progressCallbackWrapper(void * userp, double dltotal, double dlnow, double ultotal, double ulnow)
|
struct State
|
||||||
{
|
{
|
||||||
return ((CurlDownloader *) userp)->progressCallback(dltotal, dlnow);
|
bool quit = false;
|
||||||
}
|
std::vector<std::shared_ptr<DownloadItem>> incoming;
|
||||||
|
};
|
||||||
|
|
||||||
|
Sync<State> state_;
|
||||||
|
|
||||||
|
/* We can't use a std::condition_variable to wake up the curl
|
||||||
|
thread, because it only monitors file descriptors. So use a
|
||||||
|
pipe instead. */
|
||||||
|
Pipe wakeupPipe;
|
||||||
|
|
||||||
|
std::thread workerThread;
|
||||||
|
|
||||||
CurlDownloader()
|
CurlDownloader()
|
||||||
: data(make_ref<std::string>())
|
|
||||||
{
|
{
|
||||||
requestHeaders = 0;
|
static std::once_flag globalInit;
|
||||||
|
std::call_once(globalInit, curl_global_init, CURL_GLOBAL_ALL);
|
||||||
|
|
||||||
curl = curl_easy_init();
|
curlm = curl_multi_init();
|
||||||
if (!curl) throw nix::Error("unable to initialize curl");
|
|
||||||
|
curl_multi_setopt(curlm, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
|
||||||
|
curl_multi_setopt(curlm, CURLMOPT_MAX_TOTAL_CONNECTIONS, 25); // FIXME: configurable
|
||||||
|
|
||||||
|
wakeupPipe.create();
|
||||||
|
fcntl(wakeupPipe.readSide.get(), F_SETFL, O_NONBLOCK);
|
||||||
|
|
||||||
|
workerThread = std::thread([&]() { workerThreadEntry(); });
|
||||||
}
|
}
|
||||||
|
|
||||||
~CurlDownloader()
|
~CurlDownloader()
|
||||||
{
|
{
|
||||||
if (curl) curl_easy_cleanup(curl);
|
/* Signal the worker thread to exit. */
|
||||||
if (requestHeaders) curl_slist_free_all(requestHeaders);
|
{
|
||||||
|
auto state(state_.lock());
|
||||||
|
state->quit = true;
|
||||||
|
}
|
||||||
|
writeFull(wakeupPipe.writeSide.get(), " ");
|
||||||
|
|
||||||
|
workerThread.join();
|
||||||
|
|
||||||
|
if (curlm) curl_multi_cleanup(curlm);
|
||||||
}
|
}
|
||||||
|
|
||||||
bool fetch(const string & url, const DownloadOptions & options)
|
void workerThreadMain()
|
||||||
{
|
{
|
||||||
showProgress =
|
std::map<CURL *, std::shared_ptr<DownloadItem>> items;
|
||||||
options.showProgress == DownloadOptions::yes ||
|
|
||||||
(options.showProgress == DownloadOptions::automatic && isatty(STDERR_FILENO));
|
|
||||||
|
|
||||||
curl_easy_reset(curl);
|
bool quit;
|
||||||
|
|
||||||
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
|
std::chrono::steady_clock::time_point nextWakeup;
|
||||||
curl_easy_setopt(curl, CURLOPT_USERAGENT, ("Nix/" + nixVersion).c_str());
|
|
||||||
curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
|
|
||||||
|
|
||||||
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writeCallbackWrapper);
|
while (!quit) {
|
||||||
curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *) this);
|
checkInterrupt();
|
||||||
|
|
||||||
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, headerCallbackWrapper);
|
/* Let curl do its thing. */
|
||||||
curl_easy_setopt(curl, CURLOPT_HEADERDATA, (void *) this);
|
int running;
|
||||||
|
CURLMcode mc = curl_multi_perform(curlm, &running);
|
||||||
|
if (mc != CURLM_OK)
|
||||||
|
throw nix::Error(format("unexpected error from curl_multi_perform(): %s") % curl_multi_strerror(mc));
|
||||||
|
|
||||||
curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progressCallbackWrapper);
|
/* Set the promises of any finished requests. */
|
||||||
curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, (void *) this);
|
CURLMsg * msg;
|
||||||
curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0);
|
int left;
|
||||||
|
while ((msg = curl_multi_info_read(curlm, &left))) {
|
||||||
|
if (msg->msg == CURLMSG_DONE) {
|
||||||
|
auto i = items.find(msg->easy_handle);
|
||||||
|
assert(i != items.end());
|
||||||
|
i->second->finish(msg->data.result);
|
||||||
|
curl_multi_remove_handle(curlm, i->second->req);
|
||||||
|
i->second->active = false;
|
||||||
|
items.erase(i);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
|
/* Wait for activity, including wakeup events. */
|
||||||
|
int numfds = 0;
|
||||||
|
struct curl_waitfd extraFDs[1];
|
||||||
|
extraFDs[0].fd = wakeupPipe.readSide.get();
|
||||||
|
extraFDs[0].events = CURL_WAIT_POLLIN;
|
||||||
|
extraFDs[0].revents = 0;
|
||||||
|
auto sleepTimeMs =
|
||||||
|
nextWakeup != std::chrono::steady_clock::time_point()
|
||||||
|
? std::max(0, (int) std::chrono::duration_cast<std::chrono::milliseconds>(nextWakeup - std::chrono::steady_clock::now()).count())
|
||||||
|
: 1000000000;
|
||||||
|
//printMsg(lvlVomit, format("download thread waiting for %d ms") % sleepTimeMs);
|
||||||
|
mc = curl_multi_wait(curlm, extraFDs, 1, sleepTimeMs, &numfds);
|
||||||
|
if (mc != CURLM_OK)
|
||||||
|
throw nix::Error(format("unexpected error from curl_multi_wait(): %s") % curl_multi_strerror(mc));
|
||||||
|
|
||||||
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
|
nextWakeup = std::chrono::steady_clock::time_point();
|
||||||
|
|
||||||
if (options.verifyTLS)
|
/* Add new curl requests from the incoming requests queue,
|
||||||
curl_easy_setopt(curl, CURLOPT_CAINFO, getEnv("SSL_CERT_FILE", "/etc/ssl/certs/ca-certificates.crt").c_str());
|
except for requests that are embargoed (waiting for a
|
||||||
else {
|
retry timeout to expire). FIXME: should use a priority
|
||||||
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
|
queue for the embargoed items to prevent repeated O(n)
|
||||||
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
|
checks. */
|
||||||
}
|
if (extraFDs[0].revents & CURL_WAIT_POLLIN) {
|
||||||
|
char buf[1024];
|
||||||
|
auto res = read(extraFDs[0].fd, buf, sizeof(buf));
|
||||||
|
if (res == -1 && errno != EINTR)
|
||||||
|
throw SysError("reading curl wakeup socket");
|
||||||
|
}
|
||||||
|
|
||||||
data = make_ref<std::string>();
|
std::vector<std::shared_ptr<DownloadItem>> incoming, embargoed;
|
||||||
|
auto now = std::chrono::steady_clock::now();
|
||||||
|
|
||||||
if (requestHeaders) {
|
{
|
||||||
curl_slist_free_all(requestHeaders);
|
auto state(state_.lock());
|
||||||
requestHeaders = 0;
|
for (auto & item: state->incoming) {
|
||||||
}
|
if (item->embargo <= now)
|
||||||
|
incoming.push_back(item);
|
||||||
|
else {
|
||||||
|
embargoed.push_back(item);
|
||||||
|
if (nextWakeup == std::chrono::steady_clock::time_point()
|
||||||
|
|| item->embargo < nextWakeup)
|
||||||
|
nextWakeup = item->embargo;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
state->incoming = embargoed;
|
||||||
|
quit = state->quit;
|
||||||
|
}
|
||||||
|
|
||||||
if (!options.expectedETag.empty()) {
|
for (auto & item : incoming) {
|
||||||
this->expectedETag = options.expectedETag;
|
debug(format("starting download of %s") % item->request.uri);
|
||||||
requestHeaders = curl_slist_append(requestHeaders, ("If-None-Match: " + options.expectedETag).c_str());
|
item->init();
|
||||||
}
|
curl_multi_add_handle(curlm, item->req);
|
||||||
|
item->active = true;
|
||||||
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, requestHeaders);
|
items[item->req] = item;
|
||||||
|
|
||||||
if (options.head)
|
|
||||||
curl_easy_setopt(curl, CURLOPT_NOBODY, 1);
|
|
||||||
|
|
||||||
if (showProgress) {
|
|
||||||
std::cerr << (format("downloading ‘%1%’... ") % url);
|
|
||||||
std::cerr.flush();
|
|
||||||
startTime = getTime();
|
|
||||||
}
|
|
||||||
|
|
||||||
CURLcode res = curl_easy_perform(curl);
|
|
||||||
if (showProgress)
|
|
||||||
//std::cerr << "\e[" << moveBack << "D\e[K\n";
|
|
||||||
std::cerr << "\n";
|
|
||||||
checkInterrupt();
|
|
||||||
if (res == CURLE_WRITE_ERROR && etag == options.expectedETag) return false;
|
|
||||||
|
|
||||||
long httpStatus = -1;
|
|
||||||
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &httpStatus);
|
|
||||||
|
|
||||||
if (res != CURLE_OK) {
|
|
||||||
Error err =
|
|
||||||
httpStatus == 404 ? NotFound :
|
|
||||||
httpStatus == 403 ? Forbidden :
|
|
||||||
(httpStatus == 408 || httpStatus == 500 || httpStatus == 503
|
|
||||||
|| httpStatus == 504 || httpStatus == 522 || httpStatus == 524
|
|
||||||
|| res == CURLE_COULDNT_RESOLVE_HOST) ? Transient :
|
|
||||||
Misc;
|
|
||||||
if (res == CURLE_HTTP_RETURNED_ERROR && httpStatus != -1)
|
|
||||||
throw DownloadError(err, format("unable to download ‘%s’: HTTP error %d")
|
|
||||||
% url % httpStatus);
|
|
||||||
else
|
|
||||||
throw DownloadError(err, format("unable to download ‘%s’: %s (%d)")
|
|
||||||
% url % curl_easy_strerror(res) % res);
|
|
||||||
}
|
|
||||||
|
|
||||||
char *effectiveUrlCStr;
|
|
||||||
curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &effectiveUrlCStr);
|
|
||||||
if (effectiveUrlCStr)
|
|
||||||
effectiveUrl = effectiveUrlCStr;
|
|
||||||
|
|
||||||
if (httpStatus == 304) return false;
|
|
||||||
|
|
||||||
return true;
|
|
||||||
}
|
|
||||||
|
|
||||||
DownloadResult download(string url, const DownloadOptions & options) override
|
|
||||||
{
|
|
||||||
size_t attempt = 0;
|
|
||||||
|
|
||||||
while (true) {
|
|
||||||
try {
|
|
||||||
DownloadResult res;
|
|
||||||
if (fetch(resolveUri(url), options)) {
|
|
||||||
res.cached = false;
|
|
||||||
res.data = data;
|
|
||||||
} else
|
|
||||||
res.cached = true;
|
|
||||||
res.effectiveUrl = effectiveUrl;
|
|
||||||
res.etag = etag;
|
|
||||||
return res;
|
|
||||||
} catch (DownloadError & e) {
|
|
||||||
attempt++;
|
|
||||||
if (e.error != Transient || attempt >= options.tries) throw;
|
|
||||||
auto ms = options.baseRetryTimeMs * (1 << (attempt - 1));
|
|
||||||
printMsg(lvlError, format("warning: %s; retrying in %d ms") % e.what() % ms);
|
|
||||||
std::this_thread::sleep_for(std::chrono::milliseconds(ms));
|
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
debug("download thread shutting down");
|
||||||
|
}
|
||||||
|
|
||||||
|
void workerThreadEntry()
|
||||||
|
{
|
||||||
|
try {
|
||||||
|
workerThreadMain();
|
||||||
|
} catch (Interrupted & e) {
|
||||||
|
} catch (std::exception & e) {
|
||||||
|
printMsg(lvlError, format("unexpected error in download thread: %s") % e.what());
|
||||||
|
}
|
||||||
|
|
||||||
|
{
|
||||||
|
auto state(state_.lock());
|
||||||
|
state->incoming.clear();
|
||||||
|
state->quit = true;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
void enqueueItem(std::shared_ptr<DownloadItem> item)
|
||||||
|
{
|
||||||
|
{
|
||||||
|
auto state(state_.lock());
|
||||||
|
if (state->quit)
|
||||||
|
throw nix::Error("cannot enqueue download request because the download thread is shutting down");
|
||||||
|
state->incoming.push_back(item);
|
||||||
|
}
|
||||||
|
writeFull(wakeupPipe.writeSide.get(), " ");
|
||||||
|
}
|
||||||
|
|
||||||
|
std::future<DownloadResult> enqueueDownload(const DownloadRequest & request) override
|
||||||
|
{
|
||||||
|
auto item = std::make_shared<DownloadItem>(*this, request);
|
||||||
|
enqueueItem(item);
|
||||||
|
return item->promise.get_future();
|
||||||
}
|
}
|
||||||
};
|
};
|
||||||
|
|
||||||
|
ref<Downloader> getDownloader()
|
||||||
|
{
|
||||||
|
static std::shared_ptr<Downloader> downloader;
|
||||||
|
static std::once_flag downloaderCreated;
|
||||||
|
std::call_once(downloaderCreated, [&]() { downloader = makeDownloader(); });
|
||||||
|
return ref<Downloader>(downloader);
|
||||||
|
}
|
||||||
|
|
||||||
ref<Downloader> makeDownloader()
|
ref<Downloader> makeDownloader()
|
||||||
{
|
{
|
||||||
return make_ref<CurlDownloader>();
|
return make_ref<CurlDownloader>();
|
||||||
}
|
}
|
||||||
|
|
||||||
|
DownloadResult Downloader::download(const DownloadRequest & request)
|
||||||
|
{
|
||||||
|
return enqueueDownload(request).get();
|
||||||
|
}
|
||||||
|
|
||||||
Path Downloader::downloadCached(ref<Store> store, const string & url_, bool unpack, string name, const Hash & expectedHash, string * effectiveUrl)
|
Path Downloader::downloadCached(ref<Store> store, const string & url_, bool unpack, string name, const Hash & expectedHash, string * effectiveUrl)
|
||||||
{
|
{
|
||||||
auto url = resolveUri(url_);
|
auto url = resolveUri(url_);
|
||||||
|
@ -303,9 +511,9 @@ Path Downloader::downloadCached(ref<Store> store, const string & url_, bool unpa
|
||||||
if (!skip) {
|
if (!skip) {
|
||||||
|
|
||||||
try {
|
try {
|
||||||
DownloadOptions options;
|
DownloadRequest request(url);
|
||||||
options.expectedETag = expectedETag;
|
request.expectedETag = expectedETag;
|
||||||
auto res = download(url, options);
|
auto res = download(request);
|
||||||
if (effectiveUrl)
|
if (effectiveUrl)
|
||||||
*effectiveUrl = res.effectiveUrl;
|
*effectiveUrl = res.effectiveUrl;
|
||||||
|
|
||||||
|
|
|
@ -4,24 +4,30 @@
|
||||||
#include "hash.hh"
|
#include "hash.hh"
|
||||||
|
|
||||||
#include <string>
|
#include <string>
|
||||||
|
#include <future>
|
||||||
|
|
||||||
namespace nix {
|
namespace nix {
|
||||||
|
|
||||||
struct DownloadOptions
|
struct DownloadRequest
|
||||||
{
|
{
|
||||||
|
std::string uri;
|
||||||
std::string expectedETag;
|
std::string expectedETag;
|
||||||
bool verifyTLS = true;
|
bool verifyTLS = true;
|
||||||
enum { yes, no, automatic } showProgress = yes;
|
enum { yes, no, automatic } showProgress = yes;
|
||||||
bool head = false;
|
bool head = false;
|
||||||
size_t tries = 1;
|
size_t tries = 1;
|
||||||
unsigned int baseRetryTimeMs = 100;
|
unsigned int baseRetryTimeMs = 250;
|
||||||
|
|
||||||
|
DownloadRequest(const std::string & uri) : uri(uri) { }
|
||||||
};
|
};
|
||||||
|
|
||||||
struct DownloadResult
|
struct DownloadResult
|
||||||
{
|
{
|
||||||
|
enum Status { Success, NotFound, Forbidden, Misc, Transient };
|
||||||
|
Status status;
|
||||||
bool cached;
|
bool cached;
|
||||||
string etag;
|
std::string etag;
|
||||||
string effectiveUrl;
|
std::string effectiveUrl;
|
||||||
std::shared_ptr<std::string> data;
|
std::shared_ptr<std::string> data;
|
||||||
};
|
};
|
||||||
|
|
||||||
|
@ -29,14 +35,29 @@ class Store;
|
||||||
|
|
||||||
struct Downloader
|
struct Downloader
|
||||||
{
|
{
|
||||||
virtual DownloadResult download(string url, const DownloadOptions & options) = 0;
|
/* Enqueue a download request, returning a future to the result of
|
||||||
|
the download. The future may throw a DownloadError
|
||||||
|
exception. */
|
||||||
|
virtual std::future<DownloadResult> enqueueDownload(const DownloadRequest & request) = 0;
|
||||||
|
|
||||||
Path downloadCached(ref<Store> store, const string & url, bool unpack, string name = "",
|
/* Synchronously download a file. */
|
||||||
const Hash & expectedHash = Hash(), string * effectiveUrl = nullptr);
|
DownloadResult download(const DownloadRequest & request);
|
||||||
|
|
||||||
|
/* 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. */
|
||||||
|
Path downloadCached(ref<Store> store, const string & uri, bool unpack, string name = "",
|
||||||
|
const Hash & expectedHash = Hash(), string * effectiveUri = nullptr);
|
||||||
|
|
||||||
enum Error { NotFound, Forbidden, Misc, Transient };
|
enum Error { NotFound, Forbidden, Misc, Transient };
|
||||||
};
|
};
|
||||||
|
|
||||||
|
/* 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();
|
ref<Downloader> makeDownloader();
|
||||||
|
|
||||||
class DownloadError : public Error
|
class DownloadError : public Error
|
||||||
|
|
|
@ -13,17 +13,12 @@ private:
|
||||||
|
|
||||||
Path cacheUri;
|
Path cacheUri;
|
||||||
|
|
||||||
Pool<Downloader> downloaders;
|
|
||||||
|
|
||||||
public:
|
public:
|
||||||
|
|
||||||
HttpBinaryCacheStore(
|
HttpBinaryCacheStore(
|
||||||
const Params & params, const Path & _cacheUri)
|
const Params & params, const Path & _cacheUri)
|
||||||
: BinaryCacheStore(params)
|
: BinaryCacheStore(params)
|
||||||
, cacheUri(_cacheUri)
|
, cacheUri(_cacheUri)
|
||||||
, downloaders(
|
|
||||||
std::numeric_limits<size_t>::max(),
|
|
||||||
[]() { return makeDownloader(); })
|
|
||||||
{
|
{
|
||||||
if (cacheUri.back() == '/')
|
if (cacheUri.back() == '/')
|
||||||
cacheUri.pop_back();
|
cacheUri.pop_back();
|
||||||
|
@ -54,12 +49,11 @@ protected:
|
||||||
bool fileExists(const std::string & path) override
|
bool fileExists(const std::string & path) override
|
||||||
{
|
{
|
||||||
try {
|
try {
|
||||||
auto downloader(downloaders.get());
|
DownloadRequest request(cacheUri + "/" + path);
|
||||||
DownloadOptions options;
|
request.showProgress = DownloadRequest::no;
|
||||||
options.showProgress = DownloadOptions::no;
|
request.head = true;
|
||||||
options.head = true;
|
request.tries = 5;
|
||||||
options.tries = 5;
|
getDownloader()->download(request);
|
||||||
downloader->download(cacheUri + "/" + path, options);
|
|
||||||
return true;
|
return true;
|
||||||
} catch (DownloadError & e) {
|
} catch (DownloadError & e) {
|
||||||
/* S3 buckets return 403 if a file doesn't exist and the
|
/* S3 buckets return 403 if a file doesn't exist and the
|
||||||
|
@ -77,13 +71,11 @@ protected:
|
||||||
|
|
||||||
std::shared_ptr<std::string> getFile(const std::string & path) override
|
std::shared_ptr<std::string> getFile(const std::string & path) override
|
||||||
{
|
{
|
||||||
auto downloader(downloaders.get());
|
DownloadRequest request(cacheUri + "/" + path);
|
||||||
DownloadOptions options;
|
request.showProgress = DownloadRequest::no;
|
||||||
options.showProgress = DownloadOptions::no;
|
request.tries = 8;
|
||||||
options.tries = 5;
|
|
||||||
options.baseRetryTimeMs = 1000;
|
|
||||||
try {
|
try {
|
||||||
return downloader->download(cacheUri + "/" + path, options).data;
|
return getDownloader()->download(request).data;
|
||||||
} catch (DownloadError & e) {
|
} catch (DownloadError & e) {
|
||||||
if (e.error == Downloader::NotFound || e.error == Downloader::Forbidden)
|
if (e.error == Downloader::NotFound || e.error == Downloader::Forbidden)
|
||||||
return 0;
|
return 0;
|
||||||
|
|
|
@ -85,7 +85,7 @@ static void update(const StringSet & channelNames)
|
||||||
// got redirected in the process, so that we can grab the various parts of a nix channel
|
// got redirected in the process, so that we can grab the various parts of a nix channel
|
||||||
// definition from a consistent location if the redirect changes mid-download.
|
// definition from a consistent location if the redirect changes mid-download.
|
||||||
auto effectiveUrl = string{};
|
auto effectiveUrl = string{};
|
||||||
auto dl = makeDownloader();
|
auto dl = getDownloader();
|
||||||
auto filename = dl->downloadCached(store, url, false, "", Hash(), &effectiveUrl);
|
auto filename = dl->downloadCached(store, url, false, "", Hash(), &effectiveUrl);
|
||||||
url = chomp(std::move(effectiveUrl));
|
url = chomp(std::move(effectiveUrl));
|
||||||
|
|
||||||
|
@ -114,10 +114,10 @@ static void update(const StringSet & channelNames)
|
||||||
if (!unpacked) {
|
if (!unpacked) {
|
||||||
// The URL doesn't unpack directly, so let's try treating it like a full channel folder with files in it
|
// The URL doesn't unpack directly, so let's try treating it like a full channel folder with files in it
|
||||||
// Check if the channel advertises a binary cache.
|
// Check if the channel advertises a binary cache.
|
||||||
DownloadOptions opts;
|
DownloadRequest request(url + "/binary-cache-url");
|
||||||
opts.showProgress = DownloadOptions::no;
|
request.showProgress = DownloadRequest::no;
|
||||||
try {
|
try {
|
||||||
auto dlRes = dl->download(url + "/binary-cache-url", opts);
|
auto dlRes = dl->download(request);
|
||||||
extraAttrs = "binaryCacheURL = \"" + *dlRes.data + "\";";
|
extraAttrs = "binaryCacheURL = \"" + *dlRes.data + "\";";
|
||||||
} catch (DownloadError & e) {
|
} catch (DownloadError & e) {
|
||||||
}
|
}
|
||||||
|
|
|
@ -158,7 +158,7 @@ int main(int argc, char * * argv)
|
||||||
auto actualUri = resolveMirrorUri(state, uri);
|
auto actualUri = resolveMirrorUri(state, uri);
|
||||||
|
|
||||||
/* Download the file. */
|
/* Download the file. */
|
||||||
auto result = makeDownloader()->download(actualUri, DownloadOptions());
|
auto result = getDownloader()->download(DownloadRequest(actualUri));
|
||||||
|
|
||||||
AutoDelete tmpDir(createTempDir(), true);
|
AutoDelete tmpDir(createTempDir(), true);
|
||||||
Path tmpFile = (Path) tmpDir + "/tmp";
|
Path tmpFile = (Path) tmpDir + "/tmp";
|
||||||
|
|
Loading…
Reference in a new issue