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Merge remote-tracking branch 'origin/master' into flakes

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This commit is contained in:
Eelco Dolstra 2019-07-11 13:13:19 +02:00
commit 4205234f26
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GPG key ID: 8170B4726D7198DE
8 changed files with 145 additions and 162 deletions
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4
src/libstore/binary-cache-store.cc
View file

@ -10,8 +10,6 @@
#include "nar-info-disk-cache.hh"
#include "nar-accessor.hh"
#include "json.hh"
#include "retry.hh"
#include "download.hh"
#include <chrono>
@ -81,7 +79,6 @@ void BinaryCacheStore::getFile(const std::string & path, Sink & sink)
std::shared_ptr<std::string> BinaryCacheStore::getFile(const std::string & path)
{
return retry<std::shared_ptr<std::string>>(downloadSettings.tries, [&]() -> std::shared_ptr<std::string> {
StringSink sink;
try {
getFile(path, sink);
@ -89,7 +86,6 @@ std::shared_ptr<std::string> BinaryCacheStore::getFile(const std::string & path)
return nullptr;
}
return sink.s;
});
}
Path BinaryCacheStore::narInfoFileFor(const Path & storePath)

96
src/libstore/download.cc
View file

@ -8,7 +8,6 @@
#include "compression.hh"
#include "pathlocks.hh"
#include "finally.hh"
#include "retry.hh"
#ifdef ENABLE_S3
#include <aws/core/client/ClientConfiguration.h>
@ -20,9 +19,11 @@
#include <curl/curl.h>
#include <algorithm>
#include <cmath>
#include <cstring>
#include <iostream>
#include <queue>
#include <random>
#include <thread>
using namespace std::string_literals;
@ -45,6 +46,9 @@ struct CurlDownloader : public Downloader
{
CURLM * curlm = 0;
std::random_device rd;
std::mt19937 mt19937;
struct DownloadItem : public std::enable_shared_from_this<DownloadItem>
{
CurlDownloader & downloader;
@ -57,10 +61,20 @@ struct CurlDownloader : public Downloader
bool active = false; // whether the handle has been added to the multi object
std::string status;
unsigned int attempt = 0;
/* Don't start this download until the specified time point
has been reached. */
std::chrono::steady_clock::time_point embargo;
struct curl_slist * requestHeaders = 0;
std::string encoding;
bool acceptRanges = false;
curl_off_t writtenToSink = 0;
DownloadItem(CurlDownloader & downloader,
const DownloadRequest & request,
Callback<DownloadResult> callback)
@ -71,9 +85,10 @@ struct CurlDownloader : public Downloader
{request.uri}, request.parentAct)
, callback(callback)
, finalSink([this](const unsigned char * data, size_t len) {
if (this->request.dataCallback)
if (this->request.dataCallback) {
writtenToSink += len;
this->request.dataCallback((char *) data, len);
else
} else
this->result.data->append((char *) data, len);
})
{
@ -151,6 +166,7 @@ struct CurlDownloader : public Downloader
status = ss.size() >= 2 ? ss[1] : "";
result.data = std::make_shared<std::string>();
result.bodySize = 0;
acceptRanges = false;
encoding = "";
} else {
auto i = line.find(':');
@ -168,7 +184,9 @@ struct CurlDownloader : public Downloader
return 0;
}
} else if (name == "content-encoding")
encoding = trim(string(line, i + 1));;
encoding = trim(string(line, i + 1));
else if (name == "accept-ranges" && toLower(trim(std::string(line, i + 1))) == "bytes")
acceptRanges = true;
}
}
return realSize;
@ -286,6 +304,9 @@ struct CurlDownloader : public Downloader
curl_easy_setopt(req, CURLOPT_NETRC_FILE, settings.netrcFile.get().c_str());
curl_easy_setopt(req, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
if (writtenToSink)
curl_easy_setopt(req, CURLOPT_RESUME_FROM_LARGE, writtenToSink);
result.data = std::make_shared<std::string>();
result.bodySize = 0;
}
@ -320,7 +341,7 @@ struct CurlDownloader : public Downloader
failEx(writeException);
else if (code == CURLE_OK &&
(httpStatus == 200 || httpStatus == 201 || httpStatus == 204 || httpStatus == 304 || httpStatus == 226 /* FTP */ || httpStatus == 0 /* other protocol */))
(httpStatus == 200 || httpStatus == 201 || httpStatus == 204 || httpStatus == 206 || httpStatus == 304 || httpStatus == 226 /* FTP */ || httpStatus == 0 /* other protocol */))
{
result.cached = httpStatus == 304;
done = true;
@ -377,7 +398,9 @@ struct CurlDownloader : public Downloader
}
}
fail(
attempt++;
auto exc =
code == CURLE_ABORTED_BY_CALLBACK && _isInterrupted
? DownloadError(Interrupted, fmt("%s of '%s' was interrupted", request.verb(), request.uri))
: httpStatus != 0
@ -388,15 +411,41 @@ struct CurlDownloader : public Downloader
)
: DownloadError(err,
fmt("unable to %s '%s': %s (%d)",
request.verb(), request.uri, curl_easy_strerror(code), code)));
request.verb(), request.uri, curl_easy_strerror(code), code));
/* If this is a transient error, then maybe retry the
download after a while. If we're writing to a
sink, we can only retry if the server supports
ranged requests. */
if (err == Transient
&& attempt < request.tries
&& (!this->request.dataCallback
|| writtenToSink == 0
|| (acceptRanges && encoding.empty())))
{
int ms = request.baseRetryTimeMs * std::pow(2.0f, attempt - 1 + std::uniform_real_distribution<>(0.0, 0.5)(downloader.mt19937));
if (writtenToSink)
warn("%s; retrying from offset %d in %d ms", exc.what(), writtenToSink, ms);
else
warn("%s; retrying in %d ms", exc.what(), ms);
embargo = std::chrono::steady_clock::now() + std::chrono::milliseconds(ms);
downloader.enqueueItem(shared_from_this());
}
else
fail(exc);
}
}
};
struct State
{
struct EmbargoComparator {
bool operator() (const std::shared_ptr<DownloadItem> & i1, const std::shared_ptr<DownloadItem> & i2) {
return i1->embargo > i2->embargo;
}
};
bool quit = false;
std::vector<std::shared_ptr<DownloadItem>> incoming;
std::priority_queue<std::shared_ptr<DownloadItem>, std::vector<std::shared_ptr<DownloadItem>>, EmbargoComparator> incoming;
};
Sync<State> state_;
@ -409,6 +458,7 @@ struct CurlDownloader : public Downloader
std::thread workerThread;
CurlDownloader()
: mt19937(rd())
{
static std::once_flag globalInit;
std::call_once(globalInit, curl_global_init, CURL_GLOBAL_ALL);
@ -502,7 +552,9 @@ struct CurlDownloader : public Downloader
nextWakeup = std::chrono::steady_clock::time_point();
/* Add new curl requests from the incoming requests queue. */
/* Add new curl requests from the incoming requests queue,
except for requests that are embargoed (waiting for a
retry timeout to expire). */
if (extraFDs[0].revents & CURL_WAIT_POLLIN) {
char buf[1024];
auto res = read(extraFDs[0].fd, buf, sizeof(buf));
@ -511,9 +563,22 @@ struct CurlDownloader : public Downloader
}
std::vector<std::shared_ptr<DownloadItem>> incoming;
auto now = std::chrono::steady_clock::now();
{
auto state(state_.lock());
std::swap(state->incoming, incoming);
while (!state->incoming.empty()) {
auto item = state->incoming.top();
if (item->embargo <= now) {
incoming.push_back(item);
state->incoming.pop();
} else {
if (nextWakeup == std::chrono::steady_clock::time_point()
|| item->embargo < nextWakeup)
nextWakeup = item->embargo;
break;
}
}
quit = state->quit;
}
@ -535,12 +600,12 @@ struct CurlDownloader : public Downloader
workerThreadMain();
} catch (nix::Interrupted & e) {
} catch (std::exception & e) {
printError(format("unexpected error in download thread: %s") % e.what());
printError("unexpected error in download thread: %s", e.what());
}
{
auto state(state_.lock());
state->incoming.clear();
while (!state->incoming.empty()) state->incoming.pop();
state->quit = true;
}
}
@ -556,7 +621,7 @@ struct CurlDownloader : public Downloader
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);
state->incoming.push(item);
}
writeFull(wakeupPipe.writeSide.get(), " ");
}
@ -639,9 +704,7 @@ std::future<DownloadResult> Downloader::enqueueDownload(const DownloadRequest &
DownloadResult Downloader::download(const DownloadRequest & request)
{
return retry<DownloadResult>(request.tries, [&]() {
return enqueueDownload(request).get();
});
}
void Downloader::download(DownloadRequest && request, Sink & sink)
@ -828,7 +891,7 @@ CachedDownloadResult Downloader::downloadCached(
writeFile(dataFile, url + "\n" + res.etag + "\n" + std::to_string(time(0)) + "\n");
} catch (DownloadError & e) {
if (storePath.empty()) throw;
warn("%s; using cached result", e.msg());
warn("warning: %s; using cached result", e.msg());
result.etag = expectedETag;
}
}
@ -892,4 +955,5 @@ bool isUri(const string & s)
return scheme == "http" || scheme == "https" || scheme == "file" || scheme == "channel" || scheme == "git" || scheme == "s3" || scheme == "ssh";
}
}

11
src/libstore/download.hh
View file

@ -99,13 +99,11 @@ struct Downloader
std::future<DownloadResult> enqueueDownload(const DownloadRequest & request);
/* Synchronously download a file. The request will be retried in
case of transient failures. */
/* 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. The request will not be
retried in case of transient failures. */
invoked on the thread of the caller. */
void download(DownloadRequest && request, Sink & sink);
/* Check if the specified file is already in ~/.cache/nix/tarballs
@ -131,11 +129,6 @@ public:
DownloadError(Downloader::Error error, const FormatOrString & fs)
: Error(fs), error(error)
{ }
bool isTransient() override
{
return error == Downloader::Error::Transient;
}
};
bool isUri(const string & s);

32
src/libstore/http-binary-cache-store.cc
View file

@ -2,7 +2,6 @@
#include "download.hh"
#include "globals.hh"
#include "nar-info-disk-cache.hh"
#include "retry.hh"
namespace nix {
@ -136,46 +135,21 @@ protected:
{
checkEnabled();
struct State
{
DownloadRequest request;
std::function<void()> tryDownload;
unsigned int attempt = 0;
State(DownloadRequest && request) : request(request) {}
};
auto request(makeRequest(path));
auto state = std::make_shared<State>(makeRequest(path));
state->tryDownload = [callback, state, this]() {
getDownloader()->enqueueDownload(state->request,
{[callback, state, this](std::future<DownloadResult> result) {
getDownloader()->enqueueDownload(request,
{[callback, this](std::future<DownloadResult> result) {
try {
callback(result.get().data);
} catch (DownloadError & e) {
if (e.error == Downloader::NotFound || e.error == Downloader::Forbidden)
return callback(std::shared_ptr<std::string>());
++state->attempt;
if (state->attempt < state->request.tries && e.isTransient()) {
auto ms = retrySleepTime(state->attempt);
warn("%s; retrying in %d ms", e.what(), ms);
/* We can't sleep here because that would
block the download thread. So use a
separate thread for sleeping. */
std::thread([state, ms]() {
std::this_thread::sleep_for(std::chrono::milliseconds(ms));
state->tryDownload();
}).detach();
} else {
maybeDisable();
callback.rethrow();
}
} catch (...) {
callback.rethrow();
}
}});
};
state->tryDownload();
}
};

6
src/libstore/store-api.cc
View file

@ -6,11 +6,10 @@
#include "thread-pool.hh"
#include "json.hh"
#include "derivations.hh"
#include "retry.hh"
#include "download.hh"
#include <future>
namespace nix {
@ -580,8 +579,6 @@ void Store::buildPaths(const PathSet & paths, BuildMode buildMode)
void copyStorePath(ref<Store> srcStore, ref<Store> dstStore,
const Path & storePath, RepairFlag repair, CheckSigsFlag checkSigs)
{
retry<void>(downloadSettings.tries, [&]() {
auto srcUri = srcStore->getUri();
auto dstUri = dstStore->getUri();
@ -630,7 +627,6 @@ void copyStorePath(ref<Store> srcStore, ref<Store> dstStore,
});
dstStore->addToStore(*info, *source, repair, checkSigs);
});
}

38
src/libutil/retry.hh
View file

@ -1,38 +0,0 @@
#pragma once
#include "logging.hh"
#include <functional>
#include <cmath>
#include <random>
#include <thread>
namespace nix {
inline unsigned int retrySleepTime(unsigned int attempt)
{
std::random_device rd;
std::mt19937 mt19937;
return 250.0 * std::pow(2.0f,
attempt - 1 + std::uniform_real_distribution<>(0.0, 0.5)(mt19937));
}
template<typename C>
C retry(unsigned int attempts, std::function<C()> && f)
{
unsigned int attempt = 0;
while (true) {
try {
return f();
} catch (BaseError & e) {
++attempt;
if (attempt >= attempts || !e.isTransient())
throw;
auto ms = retrySleepTime(attempt);
warn("%s; retrying in %d ms", e.what(), ms);
std::this_thread::sleep_for(std::chrono::milliseconds(ms));
}
}
}
}

2
src/libutil/types.hh
View file

@ -109,8 +109,6 @@ public:
const string & msg() const { return err; }
const string & prefix() const { return prefix_; }
BaseError & addPrefix(const FormatOrString & fs);
virtual bool isTransient() { return false; }
};
#define MakeError(newClass, superClass) \

2
src/nix/copy.cc
View file

@ -36,7 +36,7 @@ struct CmdCopy : StorePathsCommand
.set(&checkSigs, NoCheckSigs);
mkFlag()
.longName("substitute")
.longName("substitute-on-destination")
.shortName('s')
.description("whether to try substitutes on the destination store (only supported by SSH)")
.set(&substitute, Substitute);