forked from lix-project/lix
167e36a5c3
This prevents unnecessary and slow rebuilds of NARs that already exist in the binary cache.
538 lines
18 KiB
Perl
538 lines
18 KiB
Perl
#! @perl@ -w @perlFlags@
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use DBI;
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use File::Basename;
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use IO::Select;
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use Nix::Config;
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use Nix::Store;
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use Nix::Utils;
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use Nix::Manifest;
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use WWW::Curl::Easy;
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use WWW::Curl::Multi;
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use strict;
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Nix::Config::readConfig;
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my @caches;
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my $gotCaches = 0;
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my $maxParallelRequests = int($Nix::Config::config{"binary-caches-parallel-connections"} // 150);
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$maxParallelRequests = 1 if $maxParallelRequests < 1;
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my $ttlNegative = 24 * 3600; # when to purge negative lookups from the database
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my $ttlNegativeUse = 3600; # how long negative lookups are valid for non-"have" lookups
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my $didExpiration = 0;
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my $debug = ($ENV{"NIX_DEBUG_SUBST"} // "") eq 1;
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open(STDERR, ">>/dev/tty") if $debug;
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my ($dbh, $queryCache, $insertNAR, $queryNAR, $insertNARExistence, $queryNARExistence, $expireNARExistence);
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my $curlm = WWW::Curl::Multi->new;
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my $activeRequests = 0;
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my $curlIdCount = 1;
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my %requests;
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my %scheduled;
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my $caBundle = $ENV{"CURL_CA_BUNDLE"} // $ENV{"OPENSSL_X509_CERT_FILE"};
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sub addRequest {
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my ($storePath, $url, $head) = @_;
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my $curl = WWW::Curl::Easy->new;
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my $curlId = $curlIdCount++;
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$requests{$curlId} = { storePath => $storePath, url => $url, handle => $curl, content => "", type => $head ? "HEAD" : "GET" };
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$curl->setopt(CURLOPT_PRIVATE, $curlId);
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$curl->setopt(CURLOPT_URL, $url);
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open (my $fh, ">", \$requests{$curlId}->{content});
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$curl->setopt(CURLOPT_WRITEDATA, $fh);
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$curl->setopt(CURLOPT_FOLLOWLOCATION, 1);
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$curl->setopt(CURLOPT_CAINFO, $caBundle) if defined $caBundle;
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$curl->setopt(CURLOPT_USERAGENT, "Nix/$Nix::Config::version");
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$curl->setopt(CURLOPT_NOBODY, 1) if $head;
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$curl->setopt(CURLOPT_FAILONERROR, 1);
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if ($activeRequests >= $maxParallelRequests) {
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$scheduled{$curlId} = 1;
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} else {
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$curlm->add_handle($curl);
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$activeRequests++;
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}
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return $requests{$curlId};
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}
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sub processRequests {
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while ($activeRequests) {
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my ($rfds, $wfds, $efds) = $curlm->fdset();
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#print STDERR "R = @{$rfds}, W = @{$wfds}, E = @{$efds}\n";
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# Sleep until we can read or write some data.
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if (scalar @{$rfds} + scalar @{$wfds} + scalar @{$efds} > 0) {
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IO::Select->select(IO::Select->new(@{$rfds}), IO::Select->new(@{$wfds}), IO::Select->new(@{$efds}), 0.1);
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}
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if ($curlm->perform() != $activeRequests) {
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while (my ($id, $result) = $curlm->info_read) {
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if ($id) {
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my $request = $requests{$id} or die;
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my $handle = $request->{handle};
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$request->{result} = $result;
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$request->{httpStatus} = $handle->getinfo(CURLINFO_RESPONSE_CODE);
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print STDERR "$request->{type} on $request->{url} [$request->{result}, $request->{httpStatus}]\n" if $debug;
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$activeRequests--;
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delete $request->{handle};
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if (scalar(keys %scheduled) > 0) {
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my $id2 = (keys %scheduled)[0];
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$curlm->add_handle($requests{$id2}->{handle});
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$activeRequests++;
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delete $scheduled{$id2};
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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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sub initCache {
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my $dbPath = "$Nix::Config::stateDir/binary-cache-v1.sqlite";
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# Open/create the database.
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$dbh = DBI->connect("dbi:SQLite:dbname=$dbPath", "", "")
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or die "cannot open database `$dbPath'";
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$dbh->{RaiseError} = 1;
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$dbh->{PrintError} = 0;
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$dbh->do("pragma synchronous = off"); # we can always reproduce the cache
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$dbh->do("pragma journal_mode = truncate");
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# Initialise the database schema, if necessary.
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$dbh->do(<<EOF);
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create table if not exists BinaryCaches (
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id integer primary key autoincrement not null,
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url text unique not null,
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timestamp integer not null,
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storeDir text not null,
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wantMassQuery integer not null
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);
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EOF
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$dbh->do(<<EOF);
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create table if not exists NARs (
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cache integer not null,
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storePath text not null,
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url text not null,
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compression text not null,
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fileHash text,
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fileSize integer,
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narHash text,
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narSize integer,
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refs text,
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deriver text,
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system text,
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timestamp integer not null,
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primary key (cache, storePath),
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foreign key (cache) references BinaryCaches(id) on delete cascade
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);
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EOF
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$dbh->do(<<EOF);
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create table if not exists NARExistence (
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cache integer not null,
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storePath text not null,
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exist integer not null,
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timestamp integer not null,
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primary key (cache, storePath),
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foreign key (cache) references BinaryCaches(id) on delete cascade
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);
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EOF
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$dbh->do("create index if not exists NARExistenceByExistTimestamp on NARExistence (exist, timestamp)");
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$queryCache = $dbh->prepare("select id, storeDir, wantMassQuery from BinaryCaches where url = ?") or die;
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$insertNAR = $dbh->prepare(
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"insert or replace into NARs(cache, storePath, url, compression, fileHash, fileSize, narHash, " .
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"narSize, refs, deriver, system, timestamp) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)") or die;
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$queryNAR = $dbh->prepare("select * from NARs where cache = ? and storePath = ?") or die;
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$insertNARExistence = $dbh->prepare(
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"insert or replace into NARExistence(cache, storePath, exist, timestamp) values (?, ?, ?, ?)") or die;
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$queryNARExistence = $dbh->prepare("select exist, timestamp from NARExistence where cache = ? and storePath = ?") or die;
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$expireNARExistence = $dbh->prepare("delete from NARExistence where exist = ? and timestamp < ?") or die;
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}
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sub getAvailableCaches {
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return if $gotCaches;
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$gotCaches = 1;
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sub strToList {
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my ($s) = @_;
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return map { s/\/+$//; $_ } split(/ /, $s);
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}
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my @urls = strToList ($Nix::Config::config{"binary-caches"} // "");
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# // ($Nix::Config::storeDir eq "/nix/store" ? "http://nixos.org/binary-cache" : ""));
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my $urlsFiles = $Nix::Config::config{"binary-cache-files"}
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// "/nix/var/nix/profiles/per-user/root/channels/binary-caches/*";
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foreach my $urlFile (glob $urlsFiles) {
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next unless -f $urlFile;
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open FILE, "<$urlFile" or die "cannot open ‘$urlFile’\n";
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my $url = <FILE>; chomp $url;
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close FILE;
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push @urls, strToList($url);
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}
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# Allow Nix daemon users to override the binary caches to a subset
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# of those listed in the config file. Note that ‘untrusted-*’
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# denotes options passed by the client.
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if (defined $Nix::Config::config{"untrusted-binary-caches"}) {
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my @untrustedUrls = strToList $Nix::Config::config{"untrusted-binary-caches"};
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my @trustedUrls = uniq(@urls, strToList($Nix::Config::config{"trusted-binary-caches"} // ""));
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@urls = ();
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foreach my $url (@untrustedUrls) {
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die "binary cache ‘$url’ is not trusted (please add it to ‘trusted-binary-caches’ [@trustedUrls] in $Nix::Config::confDir/nix.conf)\n"
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unless scalar(grep { $url eq $_ } @trustedUrls) > 0;
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push @urls, $url;
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}
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}
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foreach my $url (uniq @urls) {
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# FIXME: not atomic.
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$queryCache->execute($url);
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my $res = $queryCache->fetchrow_hashref();
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if (defined $res) {
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next if $res->{storeDir} ne $Nix::Config::storeDir;
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push @caches, { id => $res->{id}, url => $url, wantMassQuery => $res->{wantMassQuery} };
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next;
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}
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# Get the cache info file.
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my $request = addRequest(undef, $url . "/nix-cache-info");
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processRequests;
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if ($request->{result} != 0) {
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print STDERR "could not download ‘$request->{url}’ (" .
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($request->{result} != 0 ? "Curl error $request->{result}" : "HTTP status $request->{httpStatus}") . ")\n";
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next;
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}
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my $storeDir = "/nix/store";
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my $wantMassQuery = 0;
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foreach my $line (split "\n", $request->{content}) {
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unless ($line =~ /^(.*): (.*)$/) {
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print STDERR "bad cache info file ‘$request->{url}’\n";
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return undef;
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}
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if ($1 eq "StoreDir") { $storeDir = $2; }
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elsif ($1 eq "WantMassQuery") { $wantMassQuery = int($2); }
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}
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$dbh->do("insert into BinaryCaches(url, timestamp, storeDir, wantMassQuery) values (?, ?, ?, ?)",
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{}, $url, time(), $storeDir, $wantMassQuery);
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my $id = $dbh->last_insert_id("", "", "", "");
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next if $storeDir ne $Nix::Config::storeDir;
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push @caches, { id => $id, url => $url, wantMassQuery => $wantMassQuery };
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}
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expireNegative();
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}
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sub processNARInfo {
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my ($storePath, $cache, $request) = @_;
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if ($request->{result} != 0) {
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if ($request->{result} != 37 && $request->{httpStatus} != 404) {
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print STDERR "could not download ‘$request->{url}’ (" .
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($request->{result} != 0 ? "Curl error $request->{result}" : "HTTP status $request->{httpStatus}") . ")\n";
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} else {
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$insertNARExistence->execute($cache->{id}, basename($storePath), 0, time())
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unless $request->{url} =~ /^file:/;
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}
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return undef;
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}
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my $narInfo = parseNARInfo($storePath, $request->{content});
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return undef unless defined $narInfo;
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# Cache the result.
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$insertNAR->execute(
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$cache->{id}, basename($storePath), $narInfo->{url}, $narInfo->{compression},
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$narInfo->{fileHash}, $narInfo->{fileSize}, $narInfo->{narHash}, $narInfo->{narSize},
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join(" ", @$narInfo->{refs}), $narInfo->{deriver}, $narInfo->{system}, time())
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unless $request->{url} =~ /^file:/;
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return $narInfo;
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}
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sub getCachedInfoFrom {
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my ($storePath, $cache) = @_;
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$queryNAR->execute($cache->{id}, basename($storePath));
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my $res = $queryNAR->fetchrow_hashref();
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return undef unless defined $res;
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return
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{ url => $res->{url}
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, compression => $res->{compression}
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, fileHash => $res->{fileHash}
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, fileSize => $res->{fileSize}
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, narHash => $res->{narHash}
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, narSize => $res->{narSize}
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, refs => [ split " ", $res->{refs} ]
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, deriver => $res->{deriver}
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} if defined $res;
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}
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sub negativeHit {
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my ($storePath, $cache) = @_;
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$queryNARExistence->execute($cache->{id}, basename($storePath));
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my $res = $queryNARExistence->fetchrow_hashref();
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return defined $res && $res->{exist} == 0 && time() - $res->{timestamp} < $ttlNegativeUse;
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}
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sub positiveHit {
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my ($storePath, $cache) = @_;
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return 1 if defined getCachedInfoFrom($storePath, $cache);
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$queryNARExistence->execute($cache->{id}, basename($storePath));
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my $res = $queryNARExistence->fetchrow_hashref();
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return defined $res && $res->{exist} == 1;
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}
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sub expireNegative {
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return if $didExpiration;
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$didExpiration = 1;
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my $time = time();
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# Round up to the next multiple of the TTL to ensure that we do
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# expiration only once per time interval. E.g. if $ttlNegative ==
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# 3600, we expire entries at most once per hour. This is
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# presumably faster than expiring a few entries per request (and
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# thus doing a transaction).
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my $limit = (int($time / $ttlNegative) - 1) * $ttlNegative;
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$expireNARExistence->execute($limit, 0);
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print STDERR "expired ", $expireNARExistence->rows, " negative entries\n" if $debug;
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}
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sub printInfo {
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my ($storePath, $info) = @_;
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print "$storePath\n";
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print $info->{deriver} ? "$Nix::Config::storeDir/$info->{deriver}" : "", "\n";
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print scalar @{$info->{refs}}, "\n";
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print "$Nix::Config::storeDir/$_\n" foreach @{$info->{refs}};
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print $info->{fileSize} || 0, "\n";
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print $info->{narSize} || 0, "\n";
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}
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sub infoUrl {
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my ($binaryCacheUrl, $storePath) = @_;
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my $pathHash = substr(basename($storePath), 0, 32);
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my $infoUrl = "$binaryCacheUrl/$pathHash.narinfo";
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}
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sub printInfoParallel {
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my @paths = @_;
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# First print all paths for which we have cached info.
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my @left;
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foreach my $storePath (@paths) {
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my $found = 0;
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foreach my $cache (@caches) {
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my $info = getCachedInfoFrom($storePath, $cache);
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if (defined $info) {
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printInfo($storePath, $info);
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$found = 1;
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last;
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}
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}
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push @left, $storePath if !$found;
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}
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return if scalar @left == 0;
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foreach my $cache (@caches) {
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my @left2;
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%requests = ();
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foreach my $storePath (@left) {
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if (negativeHit($storePath, $cache)) {
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push @left2, $storePath;
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next;
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}
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addRequest($storePath, infoUrl($cache->{url}, $storePath));
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}
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processRequests;
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foreach my $request (values %requests) {
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my $info = processNARInfo($request->{storePath}, $cache, $request);
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if (defined $info) {
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printInfo($request->{storePath}, $info);
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} else {
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push @left2, $request->{storePath};
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}
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}
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@left = @left2;
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}
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}
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sub printSubstitutablePaths {
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my @paths = @_;
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# First look for paths that have cached info.
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my @left;
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foreach my $storePath (@paths) {
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my $found = 0;
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foreach my $cache (@caches) {
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next unless $cache->{wantMassQuery};
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if (positiveHit($storePath, $cache)) {
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print "$storePath\n";
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$found = 1;
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last;
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}
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}
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push @left, $storePath if !$found;
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}
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return if scalar @left == 0;
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# For remaining paths, do HEAD requests.
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foreach my $cache (@caches) {
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next unless $cache->{wantMassQuery};
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my @left2;
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%requests = ();
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foreach my $storePath (@left) {
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if (negativeHit($storePath, $cache)) {
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push @left2, $storePath;
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next;
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}
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addRequest($storePath, infoUrl($cache->{url}, $storePath), 1);
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}
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processRequests;
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foreach my $request (values %requests) {
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if ($request->{result} != 0) {
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if ($request->{result} != 37 && $request->{httpStatus} != 404) {
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print STDERR "could not check ‘$request->{url}’ (" .
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($request->{result} != 0 ? "Curl error $request->{result}" : "HTTP status $request->{httpStatus}") . ")\n";
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} else {
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$insertNARExistence->execute($cache->{id}, basename($request->{storePath}), 0, time())
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unless $request->{url} =~ /^file:/;
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}
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push @left2, $request->{storePath};
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} else {
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$insertNARExistence->execute($cache->{id}, basename($request->{storePath}), 1, time())
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unless $request->{url} =~ /^file:/;
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print "$request->{storePath}\n";
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}
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}
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@left = @left2;
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}
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}
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sub downloadBinary {
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my ($storePath, $destPath) = @_;
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foreach my $cache (@caches) {
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my $info = getCachedInfoFrom($storePath, $cache);
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unless (defined $info) {
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next if negativeHit($storePath, $cache);
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my $request = addRequest($storePath, infoUrl($cache->{url}, $storePath));
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processRequests;
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$info = processNARInfo($storePath, $cache, $request);
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}
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next unless defined $info;
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my $decompressor;
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if ($info->{compression} eq "bzip2") { $decompressor = "$Nix::Config::bzip2 -d"; }
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elsif ($info->{compression} eq "xz") { $decompressor = "$Nix::Config::xz -d"; }
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else {
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print STDERR "unknown compression method ‘$info->{compression}’\n";
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next;
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}
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my $url = "$cache->{url}/$info->{url}"; # FIXME: handle non-relative URLs
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print STDERR "\n*** Downloading ‘$url’ to ‘$storePath’...\n";
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checkURL $url;
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if (system("$Nix::Config::curl --fail --location --insecure '$url' | $decompressor | $Nix::Config::binDir/nix-store --restore $destPath") != 0) {
|
||
die "download of `$info->{url}' failed" . ($! ? ": $!" : "") . "\n" unless $? == 0;
|
||
next;
|
||
}
|
||
|
||
# Tell Nix about the expected hash so it can verify it.
|
||
print "$info->{narHash}\n";
|
||
|
||
print STDERR "\n";
|
||
return;
|
||
}
|
||
|
||
print STDERR "could not download ‘$storePath’ from any binary cache\n";
|
||
}
|
||
|
||
|
||
initCache();
|
||
|
||
|
||
if ($ARGV[0] eq "--query") {
|
||
|
||
while (<STDIN>) {
|
||
getAvailableCaches;
|
||
chomp;
|
||
my ($cmd, @args) = split " ", $_;
|
||
|
||
if ($cmd eq "have") {
|
||
print STDERR "checking binary caches for existence of @args\n" if $debug;
|
||
printSubstitutablePaths(@args);
|
||
print "\n";
|
||
}
|
||
|
||
elsif ($cmd eq "info") {
|
||
print STDERR "checking binary caches for info on @args\n" if $debug;
|
||
printInfoParallel(@args);
|
||
print "\n";
|
||
}
|
||
|
||
else { die "unknown command `$cmd'"; }
|
||
|
||
flush STDOUT;
|
||
}
|
||
|
||
}
|
||
|
||
elsif ($ARGV[0] eq "--substitute") {
|
||
my $storePath = $ARGV[1] or die;
|
||
my $destPath = $ARGV[2] or die;
|
||
getAvailableCaches;
|
||
downloadBinary($storePath, $destPath);
|
||
}
|
||
|
||
else {
|
||
die;
|
||
}
|