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# -*- cperl -*-
# Copyright (c) 2013, 2021, Oracle and/or its affiliates.
# All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2.0,
# as published by the Free Software Foundation.
#
# This program is also distributed with certain software (including
# but not limited to OpenSSL) that is licensed under separate terms,
# as designated in a particular file or component or in included license
# documentation. The authors of MySQL hereby grant you an additional
# permission to link the program and your derivative works with the
# separately licensed software that they have included with MySQL.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License, version 2.0, for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
########## Memcache Client Library for Perl
###
### $mc = My::Memcache->new() create an ascii-protocol client
### $mc = My::Memcache::Binary->new() create a binary-protocol client
###
### $mc->connect(host, port) returns 1 on success, 0 on failure
###
### $mc->{error} holds most recent error/status message
###
### $mc->store(cmd, key, value, ...) alternate API for set/add/replace/append/prepend
### $mc->set(key, value) returns 1 on success, 0 on failure
### $mc->add(key, value) set if record does not exist
### $mc->replace(key, value) set if record exists
### $mc->append(key, value) append value to existing data
### $mc->prepend(key, value) prepend value to existing data
###
### $mc->get(key, [ key ...]) returns a value or undef
### $mc->next_result() Fetch results after get()
###
### $mc->delete(key) returns 1 on success, 0 on failure
### $mc->stats(stat_key) get stats; returns a hash
### $mc->incr(key, amount, [initial]) returns the new value or undef
### $mc->decr(key, amount, [initial]) like incr.
### The third argument is used in
### the binary protocol ONLY.
### $mc->flush() flush_all
###
### $mc->set_expires(sec) Set TTL for all store operations
### $mc->set_flags(int_flags) Set numeric flags for store operations
###
### $mc->note_config_version()
### Store the generation number of the running config in the filesystem,
### for later use by wait_for_reconf()
###
### $mc->wait_for_reconf()
### Wait for NDB/Memcache to complete online reconfiguration.
### Returns the generation number of the newly running configuration,
### or zero on timeout/error.
################ TODO ################################
### * Support explicit binary k/q commands with pipelining
### * Implement TOUCH & GAT commands
### * Support UDP
### * Standardize APIs to take (key, value, hashref-of-options)
use strict;
use IO::Socket::INET;
use IO::File;
use Carp;
use Time::HiRes;
use Errno qw( EWOULDBLOCK );
######## Memcache Result
package My::Memcache::Result;
sub new {
my ($pkg, $key, $flags, $cas) = @_;
$cas = 0 if(! defined($cas));
bless {
"key" => $key,
"flags" => $flags,
"cas" => $cas,
"value" => undef,
}, $pkg;
}
######## Memcache Client
package My::Memcache;
sub new {
my $pkg = shift;
# min/max wait refer to msec. wait during temporary errors. Both powers of 2.
# io_timeout is in seconds (possibly fractional)
# io_timeout * max_read_tries = read timeout
bless { "created" => 1 , "error" => "OK" , "cf_gen" => 0, "req_id" => 0,
"min_wait" => 4, "max_wait" => 8192, "temp_errors" => 0 ,
"total_wait" => 0, "has_cas" => 0, "flags" => 0, "exptime" => 0,
"get_results" => undef, "get_with_cas" => 0, "failed" => 0,
"io_timeout" => 5.0, "sysread_size" => 512, "max_read_tries" => 6,
"readbuf" => "", "buflen" => 0, "error_detail" => "", "read_try" => 0,
"max_write_tries" => 6
}, $pkg;
}
sub summarize {
my $val = shift;
my $len = length $val;
if($len > 25) {
return substr($val,0,10) . "..." . substr($val,-10) . " [len $len]";
} else {
return $val;
}
}
# fail() is called when an MTR test fails
sub fail {
my $self = shift;
my $fd;
if($self->{failed}) {
print STDERR " /// My::Memcache::fail() called recursively.\n";
return;
}
$self->{failed} = 1;
my $msg =
"error: " . $self->{error} ."\t".
"read_try: " . $self->{read_try} ."\t".
"protocol: " . $self->protocol() ."\n".
"req_id: " . $self->{req_id} ."\t".
"temp err wait: " . $self->{total_wait} ." msec.\n";
$msg .= "detail: " . $self->{error_detail} . "\n";
$msg .= "buffer: " . summarize($self->{readbuf}) . "\n";
my $r = $self->next_result();
$msg .= "value: " . summarize($r->{value}) . "\n" if($r);
while(my $extra = shift) {
$msg .= $extra;
}
$msg .= "\n";
$msg .= $self->get_server_error_stats();
# Load Average on linux
$msg .= ("Load Avg: " . <$fd>) if(open($fd, "/proc/loadavg"));
$msg .= "====~~~~____~~~~====\n";
Carp::confess($msg);
}
# Attempt a new connection to memcached to flush the server's error log
# and obtain error statistics
sub get_server_error_stats {
my $self = shift;
my $new_client = My::Memcache::Binary->new();
my $r = $new_client->connect($self->{host}, $self->{port});
my $msg = "";
if($r) {
my %stats = $new_client->stats("errors"); # also flushes server log
$msg .= "Server error stats:\n";
$msg .= sprintf("%s : %s\n", $_, $stats{$_}) for keys(%stats);
} else {
$msg = "Attempted new server connection to fetch error statistics but failed.\n";
}
return $msg;
}
# Common code to ASCII and BINARY protocols:
sub connect {
my $self = shift;
my $host = shift;
my $port = shift;
my $conn;
# Wait for memcached to be ready, up to ten seconds.
my $retries = 100;
do {
$conn = IO::Socket::INET->new(PeerAddr => "$host:$port", Proto => "tcp");
if(! $conn) {
Time::HiRes::usleep(100 * 1000);
$retries--;
}
} while($retries && !$conn);
if($conn) {
$conn->blocking(0); # Set non-blocking
my $fd = fileno $conn;
my $fdset = '';
vec($fdset, $fd, 1) = 1;
$self->{fdset} = $fdset;
$self->{connection} = $conn;
$self->{host} = $host;
$self->{port} = $port;
return 1;
}
$self->{error} = "CONNECTION_FAILED";
return 0;
}
sub DESTROY {
my $self = shift;
if($self->{connection}) {
$self->{connection}->close();
}
}
sub set_expires {
my $self = shift;
$self->{exptime} = shift;
}
sub set_flags {
my $self = shift;
$self->{flags} = shift;
}
# Some member variables are per-request.
# Clear them in preparation for a new request, and increment the request counter.
sub new_request {
my $self = shift;
$self->{error} = "OK";
$self->{read_try} = 0;
$self->{has_cas} = 0;
$self->{req_id}++;
$self->{get_results} = undef;
}
sub next_result {
my $self = shift;
shift @{$self->{get_results}};
}
# note_config_version and wait_for_reconf are only for use by mysql-test-run
sub note_config_version {
my $self = shift;
my $vardir = $ENV{MYSQLTEST_VARDIR};
# Fetch the memcached current config generation number and save it
my %stats = $self->stats("reconf");
my $F = IO::File->new("$vardir/tmp/memcache_cf_gen", "w") or die;
my $ver = $stats{"Running"};
print $F "$ver\n";
$F->close();
$self->{cf_gen} = $ver;
}
sub wait_for_reconf {
my $self = shift;
if($self->{cf_gen} == 0) {
my $cfgen = 0;
my $vardir = $ENV{MYSQLTEST_VARDIR};
my $F = IO::File->new("$vardir/tmp/memcache_cf_gen", "r");
if(defined $F) {
chomp($cfgen = <$F>);
undef $F;
}
$self->{cf_gen} = $cfgen;
}
my $wait_for = $self->{cf_gen} + 1 ;
my $new_gen = $self->wait_for_config_generation($wait_for);
if($new_gen > 0) {
$self->{cf_gen} = $new_gen;
}
else {
print STDERR "Wait for config generation $wait_for timed out.\n";
}
return $new_gen;
}
# wait_for_config_generation($cf_gen)
# Wait until memcached is running config generation >= to $cf_gen
# Returns 0 on error/timeout, or the actual running generation number
#
sub wait_for_config_generation {
my $self = shift;
my $cf_gen = shift;
my $ready = 0;
my $retries = 100; # 100 retries x 100 ms = 10s
while($retries && ! $ready) {
Time::HiRes::usleep(100 * 1000);
my %stats = $self->stats("reconf");
if($stats{"Running"} >= $cf_gen) {
$ready = $stats{"Running"};
}
else {
$retries -= 1;
}
}
return $ready;
}
# -----------------------------------------------------------------------
# -------------- Low-level Network Handling ---------------
# -----------------------------------------------------------------------
# Utility function sets error based on network error & returns false.
sub socket_error {
my $self = shift;
my $retval = shift;
my $detail = shift;
if($retval == 1) {
$self->{error} = "CONNECTION_CLOSED";
} elsif($retval == 0) {
$self->{error} = "NETWORK_TIMEOUT";
} else {
$self->{error} = "NETWORK_ERROR: " . $!;
}
$self->{error_detail} = $detail if($detail);
return 0;
}
# $mc->write(packet). Returns true on success, false on error.
sub write {
my $self = shift;
my $packet = shift;
my $len = length($packet);
my $nsent = 0;
my $attempt = 0;
my $r;
if(! $self->{connection}->connected()) {
return $self->socket_error(0, "write(): not connected");
}
while($nsent < $len) {
$r = select(undef, $self->{fdset}, undef, $self->{io_timeout});
if($r < 1) {
if(++$attempt >= $self->{max_write_tries}) {
return $self->socket_error($r, "write(): select() returned $r");
}
} else {
$r = $self->{connection}->send(substr($packet, $nsent));
if($r > 0) {
$nsent += $r;
} elsif($! != Errno::EWOULDBLOCK) {
return $self->socket_error($r, "write(): send() errno $!");
}
}
}
return 1;
}
# $mc->read(desired_size). Low-level read. Returns true on success,
# appends data to readbuf, and sets buflen. Returns false on error.
sub read {
my $self = shift;
my $length = shift;
my $sock = $self->{connection};
my $r;
if($length > 0) {
$r = select($self->{fdset}, undef, undef, $self->{io_timeout});
return $self->socket_error($r, "read(): select() $!") if($r < 0);
$r = $sock->sysread($self->{readbuf}, $length, $self->{buflen});
if($r > 0) {
$self->{buflen} += $r;
} elsif($r < 0 && $! != Errno::EWOULDBLOCK) {
return $self->socket_error( $r == 0 ? 1 : $r, "read(): sysread() $!");
}
}
return 1;
}
# Utility routine; assumes $len is available on buffer.
sub chop_from_buffer {
my $self = shift;
my $len = shift;
my $line = substr($self->{readbuf}, 0, $len);
$self->{readbuf} = substr($self->{readbuf}, $len);
$self->{buflen} -= $len;
return $line;
}
# Returns a line if available; otherwise undef
sub get_line_from_buffer {
my $self = shift;
my $line = undef;
my $idx = index($self->{readbuf}, "\r\n");
if($idx >= 0) {
$line = $self->chop_from_buffer($idx + 2); # 2 for \r\n
}
return $line;
}
# Returns length if available; otherwise undef
sub get_length_from_buffer {
my $self = shift;
my $len = shift;
if($self->{buflen} >= $len) {
return $self->chop_from_buffer($len);
}
return undef;
}
# Read up to newline. Returns a line, or sets and returns error.
sub read_line {
my $self = shift;
my $message;
$self->{read_try} = 0;
while((! defined($message)) && $self->{read_try} < $self->{max_read_tries}) {
$self->{read_try}++;
$message = $self->get_line_from_buffer();
if(! defined($message)) {
if(! $self->read($self->{sysread_size})) {
return $self->{error};
}
}
}
if(defined($message)) {
$self->normalize_error($message); # handle server error responses
return $message;
}
$self->socket_error(0, "read_line(): timeout");
return $self->{error};
}
# Read <length> bytes. Returns the data, or returns undef and sets error.
sub read_known_length {
my $self = shift;
my $len = shift;
my $data;
$self->{read_try} = 0;
while($self->{read_try} < $self->{max_read_tries}) {
$self->{read_try}++;
$data = $self->get_length_from_buffer($len);
return $data if(defined($data));
if(! $self->read($len - $self->{buflen})) {
return undef;
}
}
# Perhaps the read completed on the final attempt
$data = $self->get_length_from_buffer($len);
if(! defined($data)) {
$self->socket_error(0, "read_known_length(): timeout");
}
return $data;
}
# -----------------------------------------------------------------------
# ------------------ ASCII PROTOCOL --------------------
# -----------------------------------------------------------------------
sub protocol {
return "ascii";
}
sub protocol_error {
my $self = shift;
my $detail = shift;
if($self->{error} eq "OK") {
$self->{error} = "PROTOCOL_ERROR";
}
if($detail) {
$self->{error_detail} = $detail;
}
return undef;
}
sub ascii_command {
my $self = shift;
my $packet = shift;
my $waitTime = $self->{min_wait};
my $maxWait = $self->{max_wait};
my $reply;
do {
$self->new_request();
$self->write($packet);
$reply = $self->read_line();
if($self->{error} eq "SERVER_TEMPORARY_ERROR" && $waitTime < $maxWait) {
$self->{temp_errors} += 1;
$self->{total_wait} += ( Time::HiRes::usleep($waitTime * 1000) / 1000);
$waitTime *= 2;
}
} while($self->{error} eq "SERVER_TEMPORARY_ERROR" && $waitTime <= $maxWait);
return $reply;
}
sub delete {
my $self = shift;
my $key = shift;
my $response = $self->ascii_command("delete $key\r\n");
return 1 if($response =~ "^DELETED");
return 0 if($response =~ "^NOT_FOUND");
return 0 if($response =~ "^SERVER_ERROR");
return $self->protocol_error("delete() got response: $response");
}
sub store {
my ($self, $cmd, $key, $value, $flags, $exptime, $cas_chk) = @_;
$flags = $self->{flags} unless $flags;
$exptime = $self->{exptime} unless $exptime;
my $packet;
if(($cmd eq "cas" || $cmd eq "replace") && $cas_chk > 0)
{
$packet = sprintf("cas %s %d %d %d %d\r\n%s\r\n",
$key, $flags, $exptime, $cas_chk, length($value), $value);
}
else
{
$packet = sprintf("%s %s %d %d %d\r\n%s\r\n",
$cmd, $key, $flags, $exptime, length($value), $value);
}
my $response = $self->ascii_command($packet);
return 1 if($response =~ "^STORED");
return 0 if($response =~ "^NOT_STORED");
return 0 if($response =~ "^EXISTS");
return 0 if($response =~ "^NOT_FOUND");
return 0 if($response =~ "^SERVER_ERROR");
return $self->protocol_error("store() got response: $response");
}
sub set {
my ($self, $key, $value, $flags, $exptime) = @_;
return $self->store("set", $key, $value, $flags, $exptime);
}
sub add {
my ($self, $key, $value, $flags, $exptime) = @_;
return $self->store("add", $key, $value, $flags, $exptime);
}
sub append {
my ($self, $key, $value, $flags, $exptime) = @_;
return $self->store("append", $key, $value, $flags, $exptime);
}
sub prepend {
my ($self, $key, $value, $flags, $exptime) = @_;
return $self->store("prepend", $key, $value, $flags, $exptime);
}
sub replace {
my ($self, $key, $value, $flags, $exptime, $cas) = @_;
return $self->store("replace", $key, $value, $flags, $exptime, $cas);
}
sub get {
my $self = shift;
my @results;
my $keys = "";
$keys .= shift(@_) . " " while(@_);
my $command = $self->{get_with_cas} ? "gets" : "get";
$self->{get_with_cas} = 0; # CHECK, THEN RESET FOR NEXT CALL
my $response = $self->ascii_command("$command $keys\r\n");
return undef if($self->{error} ne "OK");
while ($response ne "END\r\n")
{
$response =~ /^VALUE (\S+) (\d+) (\d+) ?(\d+)?/;
if(! (defined($1) && defined($2) && defined($3))) {
return $self->protocol_error("GET response: $response");
}
my $result = My::Memcache::Result->new($1, $2, $4);
my $value = $self->read_known_length($3);
return undef if(!defined($value));
$result->{value} = $value;
$self->read_line(); # Get trailing \r\n after value
$self->{has_cas} = 1 if($4);
push @results, $result;
$response = $self->read_line();
}
$self->{get_results} = \@results;
return $results[0]->{value} if @results;
$self->{error} = "NOT_FOUND";
return undef;
}
sub _txt_math {
my ($self, $cmd, $key, $delta) = @_;
my $response = $self->ascii_command("$cmd $key $delta \r\n");
if ($response =~ "^NOT_FOUND" || $response =~ "ERROR") {
return undef;
}
$response =~ /(\d+)/;
return $self->protocol_error("MATH response: $response") unless defined($1);
return $1;
}
sub incr {
my ($self, $key, $delta) = @_;
return $self->_txt_math("incr", $key, $delta);
}
sub decr {
my ($self, $key, $delta) = @_;
return $self->_txt_math("decr", $key, $delta);
}
sub stats {
my $self = shift;
my $key = shift || "";
$self->new_request();
$self->write("stats $key\r\n");
my %response = ();
my $line = $self->read_line();
while($line !~ "^END") {
return %response if $line eq "ERROR\r\n";
if(($line) && ($line =~ /^STAT(\s+)(\S+)(\s+)(\S+)/)) {
$response{$2} = $4;
} else {
return $self->protocol_error("STATS response line: $line");
}
$line = $self->read_line();
}
return %response;
}
sub flush {
my $self = shift;
my $key = shift;
my $result = $self->ascii_command("flush_all\r\n");
return ($self->{error} eq "OK");
}
# Try to provide consistent error messagees across ascii & binary protocols
sub normalize_error {
my $self = shift;
my $reply = shift;
my %error_message = (
"STORED\r\n" => "OK",
"EXISTS\r\n" => "KEY_EXISTS",
"NOT_FOUND\r\n" => "NOT_FOUND",
"NOT_STORED\r\n" => "NOT_STORED",
"CLIENT_ERROR value too big\r\n" => "VALUE_TOO_LARGE",
"SERVER_ERROR object too large for cache\r\n" => "VALUE_TOO_LARGE",
"CLIENT_ERROR invalid arguments\r\n" => "INVALID_ARGUMENTS",
"SERVER_ERROR not my vbucket\r\n" => "NOT_MY_VBUCKET",
"SERVER_ERROR out of memory\r\n" => "SERVER_OUT_OF_MEMORY",
"SERVER_ERROR not supported\r\n" => "NOT_SUPPORTED",
"SERVER_ERROR internal\r\n" => "INTERNAL_ERROR",
"SERVER_ERROR temporary failure\r\n" => "SERVER_TEMPORARY_ERROR"
);
$self->{error} = $error_message{$reply} || "OK";
return 0;
}
# -----------------------------------------------------------------------
# ------------------ BINARY PROTOCOL --------------------
# -----------------------------------------------------------------------
package My::Memcache::Binary;
BEGIN { @My::Memcache::Binary::ISA = qw(My::Memcache); }
use constant BINARY_HEADER_FMT => "CCnCCnNNNN";
use constant BINARY_REQUEST => 0x80;
use constant BINARY_RESPONSE => 0x81;
use constant BIN_CMD_GET => 0x00;
use constant BIN_CMD_SET => 0x01;
use constant BIN_CMD_ADD => 0x02;
use constant BIN_CMD_REPLACE => 0x03;
use constant BIN_CMD_DELETE => 0x04;
use constant BIN_CMD_INCR => 0x05;
use constant BIN_CMD_DECR => 0x06;
use constant BIN_CMD_QUIT => 0x07;
use constant BIN_CMD_FLUSH => 0x08;
use constant BIN_CMD_NOOP => 0x0A;
use constant BIN_CMD_GETK => 0x0C;
use constant BIN_CMD_GETKQ => 0x0D;
use constant BIN_CMD_APPEND => 0x0E;
use constant BIN_CMD_PREPEND => 0x0F;
use constant BIN_CMD_STAT => 0x10;
sub protocol {
return "binary";
}
sub error_message {
my ($self, $code) = @_;
my %error_messages = (
0x00 => "OK",
0x01 => "NOT_FOUND",
0x02 => "KEY_EXISTS",
0x03 => "VALUE_TOO_LARGE",
0x04 => "INVALID_ARGUMENTS",
0x05 => "NOT_STORED",
0x06 => "NON_NUMERIC_VALUE",
0x07 => "NOT_MY_VBUCKET",
0x81 => "UNKNOWN_COMMAND",
0x82 => "SERVER_OUT_OF_MEMORY",
0x83 => "NOT_SUPPORTED",
0x84 => "INTERNAL_ERROR",
0x85 => "SERVER_BUSY",
0x86 => "SERVER_TEMPORARY_ERROR",
0x100 => "PROTOCOL_ERROR",
0x101 => "NETWORK_ERROR"
);
return $error_messages{$code};
}
# Returns true on success, false on error
sub send_binary_request {
my $self = shift;
my ($cmd, $key, $val, $extra_header, $cas) = @_;
$cas = 0 unless $cas;
my $key_len = length($key);
my $val_len = length($val);
my $extra_len = length($extra_header);
my $total_len = $key_len + $val_len + $extra_len;
my $cas_hi = ($cas >> 32) & 0xFFFFFFFF;
my $cas_lo = ($cas & 0xFFFFFFFF);
$self->new_request();
my $header = pack(BINARY_HEADER_FMT, BINARY_REQUEST, $cmd,
$key_len, $extra_len, 0, 0, $total_len,
$self->{req_id}, $cas_hi, $cas_lo);
my $packet = $header . $extra_header . $key . $val;
return $self->write($packet);
}
sub get_binary_response {
my $self = shift;
my $header_len = length(pack(BINARY_HEADER_FMT));
my $header;
my $body;
$header = $self->read_known_length($header_len);
return (0x101) if(! defined($header));
my ($magic, $cmd, $key_len, $extra_len, $datatype, $status, $body_len,
$sequence, $cas_hi, $cas_lo) = unpack(BINARY_HEADER_FMT, $header);
if($magic != BINARY_RESPONSE) {
$self->{error_detail} = "Magic number in response: $magic";
return (0x100);
}
$body = $self->read_known_length($body_len);
$self->{error} = $self->error_message($status);
# Packet structure is: header .. extras .. key .. value
my $cas = ($cas_hi * (2 ** 32)) + $cas_lo;
my $l = $extra_len + $key_len;
my $extras = substr $body, 0, $extra_len;
my $key = substr $body, $extra_len, $key_len;
my $value = substr $body, $l, $body_len - $l;
return ($status, $value, $key, $extras, $cas, $sequence);
}
sub binary_command {
my $self = shift;
my ($cmd, $key, $value, $extra_header, $cas) = @_;
my $waitTime = $self->{min_wait};
my $maxWait = $self->{max_wait};
my $status;
my $wr;
do {
$wr = $self->send_binary_request($cmd, $key, $value, $extra_header, $cas);
return undef unless $wr;
($status) = $self->get_binary_response();
if($status == 0x86 && $waitTime < $maxWait) {
$self->{temp_errors} += 1;
$self->{total_wait} += ( Time::HiRes::usleep($waitTime * 1000) / 1000);
$waitTime *= 2;
}
} while($status == 0x86 && $waitTime <= $maxWait);
return ($status == 0) ? 1 : undef;
}
sub bin_math {
my $self = shift;
my ($cmd, $key, $delta, $initial) = @_;
my $expires = 0xffffffff; # 0xffffffff means the create flag is NOT set
if(defined($initial)) { $expires = $self->{exptime}; }
else { $initial = 0; }
my $value = undef;
my $extra_header = pack "NNNNN",
($delta / (2 ** 32)), # delta hi
($delta % (2 ** 32)), # delta lo
($initial / (2 ** 32)), # initial hi
($initial % (2 ** 32)), # initial lo
$expires;
if( $self->send_binary_request($cmd, $key, '', $extra_header)) {
my ($status, $packed_val) = $self->get_binary_response();
if($status == 0) {
my ($val_hi, $val_lo) = unpack("NN", $packed_val);
$value = ($val_hi * (2 ** 32)) + $val_lo;
}
}
return $value;
}
sub bin_store {
my ($self, $cmd, $key, $value, $flags, $exptime, $cas) = @_;
$flags = $self->{flags} unless $flags;
$exptime = $self->{exptime} unless $exptime;
my $extra_header = pack "NN", $flags, $exptime;
return $self->binary_command($cmd, $key, $value, $extra_header, $cas);
}
## Pipelined multi-get
sub get {
my $self = shift;
my $idx = $#_; # Index of the final key
my $cmd = BIN_CMD_GETKQ; # GET + KEY + NOREPLY
my $wr;
my $sequence = 0;
my @results;
for(my $i = 0 ; $i <= $idx ; $i++) {
$cmd = BIN_CMD_GETK if($i == $idx); # Final request gets replies
$wr = $self->send_binary_request($cmd, $_[$i], '', '');
}
return undef unless $wr;
while($sequence < $self->{req_id}) {
my ($status, $value, $key, $extra, $cas);
($status, $value, $key, $extra, $cas, $sequence) = $self->get_binary_response();
return undef if($status > 0x01);
if($status == 0) {
my $result = My::Memcache::Result->new($key, unpack("N", $extra), $cas);
$result->{value} = $value;
push @results, $result;
}
}
$self->{get_results} = \@results;
if(@results) {
$self->{error} = "OK";
return $results[0]->{value};
}
$self->{error} = "NOT_FOUND";
return undef;
}
sub stats {
my $self = shift;
my $key = shift;
my %response, my $status, my $value, my $klen, my $tlen;
$self->send_binary_request(BIN_CMD_STAT, $key, '', '');
do {
($status, $value, $key) = $self->get_binary_response();
if($status == 0) {
$response{$key} = $value;
}
} while($status == 0 && $key);
return %response;
}
sub flush {
my ($self, $key, $value) = @_;
$self->send_binary_request(BIN_CMD_FLUSH, $key, '', '');
my ($status, $result) = $self->get_binary_response();
return ($status == 0) ? 1 : 0;
}
sub store {
my ($self, $cmd, $key, $value, $flags, $exptime, $cas) = @_;
my %cmd_map = (
"set" => BIN_CMD_SET , "add" => BIN_CMD_ADD , "replace" => BIN_CMD_REPLACE ,
"append" => BIN_CMD_APPEND , "prepend" => BIN_CMD_PREPEND
);
return $self->bin_store($cmd_map{$cmd}, $key, $value, $flags, $exptime, $cas);
}
sub set {
my ($self, $key, $value) = @_;
return $self->bin_store(BIN_CMD_SET, $key, $value);
}
sub add {
my ($self, $key, $value) = @_;
return $self->bin_store(BIN_CMD_ADD, $key, $value);
}
sub replace {
my ($self, $key, $value) = @_;
return $self->bin_store(BIN_CMD_REPLACE, $key, $value);
}
sub append {
my ($self, $key, $value) = @_;
return $self->binary_command(BIN_CMD_APPEND, $key, $value, '');
}
sub prepend {
my ($self, $key, $value) = @_;
return $self->binary_command(BIN_CMD_PREPEND, $key, $value, '');
}
sub delete {
my ($self, $key) = @_;
return $self->binary_command(BIN_CMD_DELETE, $key, '', '');
}
sub incr {
my ($self, $key, $delta, $initial) = @_;
return $self->bin_math(BIN_CMD_INCR, $key, $delta, $initial);
}
sub decr {
my ($self, $key, $delta, $initial) = @_;
return $self->bin_math(BIN_CMD_DECR, $key, $delta, $initial);
}
1;