EV-Memcached
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- Bug fixes, polish, expanded tests
0.01 2026-04-06
- Initial release
- Pure XS binary protocol, no external C library
- Core commands: get/gets, set/add/replace/cas, delete, incr/decr,
append/prepend, touch/gat/gats, flush, version, noop, quit, stats
- Multi-get (mget/mgets), fire-and-forget set/flush (SETQ/FLUSHQ)
- SASL PLAIN auth (manual + auto-auth on connect/reconnect)
- Pipelining, flow control, reconnection, connect/command timeouts
- TCP, Unix socket, keepalive, EV event loop integration
path => $str
Unix socket path. Mutually exclusive with "host".
loop => $ev_loop
EV loop to attach to. Default: "EV::default_loop".
priority => $num (-2 to +2)
EV watcher priority. Higher = serviced before other EV watchers.
keepalive => $seconds
TCP keepalive idle time. Set to 0 to disable. Ignored on Unix
sockets.
Timeouts and flow control
connect_timeout => $ms
Abort an in-progress non-blocking connect after this many
milliseconds. 0 = no timeout (default). Applies to any connect that
does not complete immediately (including unix sockets under rare
kernel backlog conditions); immediately-completing connects finish
on the next event loop iteration without arming this timer.
waiting_count
Number of commands held in the local waiting queue (because the
connection is not ready, SASL is in progress, or "max_pending" is
saturated).
ACCESSORS
The following options have a getter/setter of the same name (there are
no accessors for "host", "port", "path", "username", "password",
"reconnect_delay", "max_reconnect_attempts", or "loop"). Calling without
arguments reads the current value; with one argument it writes and
(where meaningful, e.g. "keepalive") takes effect immediately.
connect_timeout([$ms])
command_timeout([$ms])
max_pending([$num])
waiting_timeout([$ms])
resume_waiting_on_reconnect([$bool])
priority([$num])
keepalive([$seconds])
"reconnect_enabled"
Read-only; configure via "reconnect".
"reconnect($enable, [$delay_ms], [$max_attempts])"
Reconfigure auto-reconnect at runtime.
on_error([$cb])
on_connect([$cb])
on_disconnect([$cb])
Get/set the corresponding handler. Pass "undef" to clear.
The one exception is global destruction (interpreter shutdown): no Perl
callbacks are invoked then; queues are freed silently.
The clean shutdown idiom is:
$mc->disconnect; # drains queues, fires on_disconnect
undef $mc;
If a callback closes over $mc (a common mistake -- every reference
inside a callback closure keeps the object alive), break the cycle
before dropping the outer reference:
$mc->on_error(undef);
$mc->on_connect(undef);
$mc->on_disconnect(undef);
undef $mc;
DESTROY is reentrant-safe: if a callback fired during teardown drops the
last external reference to a separate "EV::Memcached", that object's
DESTROY is correctly deferred and run once unwound.
lib/EV/Memcached.pm view on Meta::CPAN
Unix socket path. Mutually exclusive with C<host>.
=item loop => $ev_loop
EV loop to attach to. Default: C<EV::default_loop>.
=item priority => $num (-2 to +2)
EV watcher priority. Higher = serviced before other EV watchers.
=item keepalive => $seconds
TCP keepalive idle time. Set to 0 to disable. Ignored on Unix sockets.
=back
=head3 Timeouts and flow control
=over
=item connect_timeout => $ms
Abort an in-progress non-blocking connect after this many milliseconds.
lib/EV/Memcached.pm view on Meta::CPAN
Number of commands held in the local waiting queue (because the
connection is not ready, SASL is in progress, or C<max_pending> is
saturated).
=head1 ACCESSORS
The following options have a getter/setter of the same name (there are
no accessors for C<host>, C<port>, C<path>, C<username>, C<password>,
C<reconnect_delay>, C<max_reconnect_attempts>, or C<loop>). Calling
without arguments reads the current value; with one argument it writes
and (where meaningful, e.g. C<keepalive>) takes effect immediately.
=over
=item C<connect_timeout([$ms])>
=item C<command_timeout([$ms])>
=item C<max_pending([$num])>
=item C<waiting_timeout([$ms])>
=item C<resume_waiting_on_reconnect([$bool])>
=item C<priority([$num])>
=item C<keepalive([$seconds])>
=item C<reconnect_enabled>
Read-only; configure via C<reconnect>.
=item C<reconnect($enable, [$delay_ms], [$max_attempts])>
Reconfigure auto-reconnect at runtime.
=item C<on_error([$cb])>
lib/EV/Memcached.pm view on Meta::CPAN
The one exception is global destruction (interpreter shutdown): no
Perl callbacks are invoked then; queues are freed silently.
The clean shutdown idiom is:
$mc->disconnect; # drains queues, fires on_disconnect
undef $mc;
If a callback closes over C<$mc> (a common mistake -- every reference
inside a callback closure keeps the object alive), break the cycle
before dropping the outer reference:
$mc->on_error(undef);
$mc->on_connect(undef);
$mc->on_disconnect(undef);
undef $mc;
DESTROY is reentrant-safe: if a callback fired during teardown drops
the last external reference to a separate C<EV::Memcached>, that
object's DESTROY is correctly deferred and run once unwound.
src/EV__Memcached.xs view on Meta::CPAN
ev_timer waiting_timer;
int waiting_timer_active;
/* Safety */
int callback_depth;
int in_cb_cleanup;
int in_wait_cleanup;
/* Options */
int priority;
int keepalive;
/* SASL auth */
char *username;
char *password;
};
/* ================================================================
* Shared error strings (initialized in BOOT)
* ================================================================ */
src/EV__Memcached.xs view on Meta::CPAN
uint64_t cas, int cmd, int quiet, SV *cb);
static void start_reading(ev_mc_t *self);
static void stop_reading(ev_mc_t *self);
static void start_writing(ev_mc_t *self);
static void stop_writing(ev_mc_t *self);
static void start_connect(pTHX_ ev_mc_t *self);
static void cleanup_connection(pTHX_ ev_mc_t *self);
static void emit_error(pTHX_ ev_mc_t *self, const char *msg);
static void handle_disconnect(pTHX_ ev_mc_t *self, const char *reason);
static void schedule_reconnect(pTHX_ ev_mc_t *self);
static void apply_keepalive(ev_mc_t *self);
static void report_connect_error(pTHX_ ev_mc_t *self, const char *errbuf);
static void finish_connect_success(pTHX_ ev_mc_t *self);
static void mc_send_sasl_auth(pTHX_ ev_mc_t *self, SV *cb);
static void stop_connect_timer(ev_mc_t *self);
static void stop_reconnect_timer(ev_mc_t *self);
static void stop_waiting_timer(ev_mc_t *self);
static void send_next_waiting(pTHX_ ev_mc_t *self);
static int check_destroyed(ev_mc_t *self);
static void cancel_pending(pTHX_ ev_mc_t *self, SV *err_sv);
static void cancel_waiting(pTHX_ ev_mc_t *self, SV *err_sv);
src/EV__Memcached.xs view on Meta::CPAN
}
static void emit_connect(pTHX_ ev_mc_t *self) {
invoke_handler(aTHX_ self, self->on_connect, NULL, "on_connect");
}
static void emit_disconnect(pTHX_ ev_mc_t *self) {
invoke_handler(aTHX_ self, self->on_disconnect, NULL, "on_disconnect");
}
static void apply_keepalive(ev_mc_t *self) {
if (self->keepalive <= 0 || self->path) return;
int one = 1;
setsockopt(self->fd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one));
#ifdef TCP_KEEPIDLE
setsockopt(self->fd, IPPROTO_TCP, TCP_KEEPIDLE,
&self->keepalive, sizeof(self->keepalive));
#endif
}
/* Common tail for synchronous connect-failure paths in start_connect:
emit error, run pending callbacks, and arm reconnect if configured.
Caller returns immediately after invoking. */
static void report_connect_error(pTHX_ ev_mc_t *self, const char *errbuf) {
self->callback_depth++;
emit_error(aTHX_ self, errbuf);
self->callback_depth--;
src/EV__Memcached.xs view on Meta::CPAN
check_destroyed(self);
}
}
/* Shared post-connect-success path. Caller must already have set
self->connected = 1 and stopped/initialized the io watchers. */
static void finish_connect_success(pTHX_ ev_mc_t *self) {
self->reconnect_attempts = 0;
start_reading(self);
apply_keepalive(self);
if (self->username && self->password) {
/* Auto-auth: on_connect fires from the SASL_AUTH success path;
on failure the connection drops without it ever firing. */
mc_send_sasl_auth(aTHX_ self, NULL);
return;
}
emit_connect(aTHX_ self);
if (check_destroyed(self)) return;
src/EV__Memcached.xs view on Meta::CPAN
else if (strEQ(k, "on_disconnect")) {
SV *h = mc_handler_arg(aTHX_ v);
if (h) RETVAL->on_disconnect = newSVsv(h);
}
else if (strEQ(k, "max_pending")) RETVAL->max_pending = SvIV(v);
else if (strEQ(k, "waiting_timeout")) RETVAL->waiting_timeout_ms = SvIV(v);
else if (strEQ(k, "connect_timeout")) RETVAL->connect_timeout_ms = SvIV(v);
else if (strEQ(k, "command_timeout")) RETVAL->command_timeout_ms = SvIV(v);
else if (strEQ(k, "resume_waiting_on_reconnect")) RETVAL->resume_waiting_on_reconnect = SvTRUE(v) ? 1 : 0;
else if (strEQ(k, "priority")) RETVAL->priority = SvIV(v);
else if (strEQ(k, "keepalive")) RETVAL->keepalive = SvIV(v);
else if (strEQ(k, "reconnect")) do_reconnect = SvTRUE(v) ? 1 : 0;
else if (strEQ(k, "reconnect_delay")) reconnect_delay = SvIV(v);
else if (strEQ(k, "max_reconnect_attempts")) max_reconnect_attempts = SvIV(v);
else if (strEQ(k, "username")) {
if (SvOK(v)) RETVAL->username = savepv(SvPV_nolen(v));
}
else if (strEQ(k, "password")) {
if (SvOK(v)) RETVAL->password = savepv(SvPV_nolen(v));
}
else if (strEQ(k, "loop")) {
/* EV's T_LOOP convention: pointer in the IV slot of the
blessed referent (SvPVX there is NULL) */
RETVAL->loop = INT2PTR(struct ev_loop *, SvIVX(SvRV(v)));
RETVAL->loop_sv = newSVsv(v); /* keep a user loop alive */
}
}
if (host_sv && path_sv) {
Safefree(RETVAL->rbuf);
Safefree(RETVAL->wbuf);
CLEAR_HANDLER(RETVAL->on_error);
CLEAR_HANDLER(RETVAL->on_connect);
CLEAR_HANDLER(RETVAL->on_disconnect);
CLEAR_HANDLER(RETVAL->loop_sv);
src/EV__Memcached.xs view on Meta::CPAN
} else {
ev_set_priority(&self->wio, self->priority);
}
}
RETVAL = self->priority;
}
OUTPUT:
RETVAL
int
keepalive(EV::Memcached self, ...)
CODE:
{
if (items > 1) {
self->keepalive = SvIV(ST(1));
if (self->keepalive < 0) self->keepalive = 0;
if (self->connected && self->fd >= 0)
apply_keepalive(self);
}
RETVAL = self->keepalive;
}
OUTPUT:
RETVAL
void
skip_pending(EV::Memcached self)
CODE:
{
self->callback_depth++;
skip_pending_impl(aTHX_ self, err_skipped);
t/04_features.t view on Meta::CPAN
run_ev();
$mc->disconnect;
}
# --- new() constructor in XS ---
{
my $mc = EV::Memcached->new(
host => $host,
port => $port,
max_pending => 10,
keepalive => 5,
priority => 1,
connect_timeout => 3000,
on_error => sub { diag "error: @_" },
);
$mc->on_connect(sub { EV::break });
my $t = EV::timer 5, 0, sub { fail("timeout"); EV::break };
EV::run;
ok($mc->is_connected, "XS new() connected");
is($mc->max_pending, 10, "XS new() max_pending");
t/14_loop_option.t view on Meta::CPAN
port => $port,
on_error => sub { $err = $_[0]; EV::break },
);
ok($mc, 'new(loop => EV::default_loop, ...) does not crash');
my $t = EV::timer 2, 0, sub { EV::break };
EV::run;
like($err, qr/connect failed/, 'connect error delivered via default loop');
}
# The held reference keeps a non-default loop alive for the object's life.
{
my $mc = EV::Memcached->new(loop => EV::Loop->new, on_error => sub {});
ok($mc, 'new(loop => EV::Loop->new) accepted');
}
# Stronger: start watchers on the custom loop, then destroy the object.
# Without the loop_sv hold the EV::Loop is freed while rio/wio are armed
# on it and DESTROY's ev_io_stop touches freed memory. NOTE: plain
# no-crash assertion here — the real check is running this file under
# valgrind (without the hold it reports invalid reads; often survives
( run in 4.775 seconds using v1.01-cache-2.11-cpan-14f38c9f855 )