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/*
Copyright (c) 2014 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include "rpc-clnt.h"
#include "rpc-clnt-ping.h"
#include "byte-order.h"
#include "xdr-rpcclnt.h"
#include "rpc-transport.h"
#include "protocol-common.h"
#include "mem-pool.h"
#include "xdr-rpc.h"
#include "rpc-common-xdr.h"
char *clnt_ping_procs[GF_DUMP_MAXVALUE] = {
[GF_DUMP_PING] = "NULL",
};
struct rpc_clnt_program clnt_ping_prog = {
.progname = "GF-DUMP",
.prognum = GLUSTER_DUMP_PROGRAM,
.progver = GLUSTER_DUMP_VERSION,
.procnames = clnt_ping_procs,
};
static void
rpc_clnt_start_ping (void *rpc_ptr);
void
rpc_clnt_ping_timer_expired (void *rpc_ptr)
{
struct rpc_clnt *rpc = NULL;
rpc_transport_t *trans = NULL;
rpc_clnt_connection_t *conn = NULL;
int disconnect = 0;
int transport_activity = 0;
struct timespec timeout = {0, };
struct timeval current = {0, };
rpc = (struct rpc_clnt*) rpc_ptr;
conn = &rpc->conn;
trans = conn->trans;
if (!trans) {
gf_log ("ping-timer", GF_LOG_WARNING,
"transport not initialized");
goto out;
}
pthread_mutex_lock (&conn->lock);
{
if (conn->ping_timer) {
gf_timer_call_cancel (rpc->ctx,
conn->ping_timer);
conn->ping_timer = NULL;
rpc_clnt_unref (rpc);
}
gettimeofday (¤t, NULL);
if (((current.tv_sec - conn->last_received.tv_sec) <
conn->ping_timeout)
|| ((current.tv_sec - conn->last_sent.tv_sec) <
conn->ping_timeout)) {
transport_activity = 1;
}
if (transport_activity) {
gf_log (trans->name, GF_LOG_TRACE,
"ping timer expired but transport activity "
"detected - not bailing transport");
timeout.tv_sec = conn->ping_timeout;
timeout.tv_nsec = 0;
rpc_clnt_ref (rpc);
conn->ping_timer =
gf_timer_call_after (rpc->ctx, timeout,
rpc_clnt_ping_timer_expired,
(void *) rpc);
if (conn->ping_timer == NULL) {
gf_log (trans->name, GF_LOG_WARNING,
"unable to setup ping timer");
conn->ping_started = 0;
rpc_clnt_unref (rpc);
}
} else {
conn->ping_started = 0;
disconnect = 1;
}
}
pthread_mutex_unlock (&conn->lock);
if (disconnect) {
gf_log (trans->name, GF_LOG_CRITICAL,
"server %s has not responded in the last %d "
"seconds, disconnecting.",
trans->peerinfo.identifier,
conn->ping_timeout);
rpc_transport_disconnect (conn->trans);
}
out:
return;
}
int
rpc_clnt_ping_cbk (struct rpc_req *req, struct iovec *iov, int count,
void *myframe)
{
struct rpc_clnt *rpc = NULL;
xlator_t *this = NULL;
rpc_clnt_connection_t *conn = NULL;
call_frame_t *frame = NULL;
struct timespec timeout = {0, };
if (!myframe) {
gf_log (THIS->name, GF_LOG_WARNING,
"frame with the request is NULL");
goto out;
}
frame = myframe;
this = frame->this;
rpc = frame->local;
frame->local = NULL; /* Prevent STACK_DESTROY from segfaulting */
conn = &rpc->conn;
pthread_mutex_lock (&conn->lock);
{
if (req->rpc_status == -1) {
if (conn->ping_timer != NULL) {
gf_log (this->name, GF_LOG_WARNING,
"socket or ib related error");
gf_timer_call_cancel (rpc->ctx,
conn->ping_timer);
conn->ping_timer = NULL;
rpc_clnt_unref (rpc);
} else {
/* timer expired and transport bailed out */
gf_log (this->name, GF_LOG_WARNING,
"socket disconnected");
}
conn->ping_started = 0;
goto unlock;
}
/* We need to unref rpc_clnt after every call cancel. This is
* because we take a ref every time a ping timer event is
* scheduled. But we are accounting for this by doing away
* with the ref we should have taken otherwise. This possible
* since ref and unref have the following property.
*
* rpc_clnt_unref (rpc); rpc_clnt_ref (rpc);
* is the same as,
* (;)
* where, rpc->refcnt > 0.
*
* Here rpc->refcnt > 0, since the ping_timer is not NULL,
* which implies the ping timer event hasn't executed, and
* therefore the ref taken when it was scheduled is still
* present. */
gf_timer_call_cancel (this->ctx,
conn->ping_timer);
timeout.tv_sec = conn->ping_timeout;
timeout.tv_nsec = 0;
conn->ping_timer = gf_timer_call_after (this->ctx, timeout,
rpc_clnt_start_ping,
(void *)rpc);
if (conn->ping_timer == NULL) {
gf_log (this->name, GF_LOG_WARNING,
"failed to set the ping timer");
conn->ping_started = 0;
rpc_clnt_unref (rpc);
}
}
unlock:
pthread_mutex_unlock (&conn->lock);
out:
if (frame)
STACK_DESTROY (frame->root);
return 0;
}
int
rpc_clnt_ping (struct rpc_clnt *rpc)
{
call_frame_t *frame = NULL;
int32_t ret = -1;
rpc_clnt_connection_t *conn = NULL;
conn = &rpc->conn;
frame = create_frame (THIS, THIS->ctx->pool);
if (!frame)
goto fail;
frame->local = rpc;
ret = rpc_clnt_submit (rpc, &clnt_ping_prog,
GF_DUMP_PING, rpc_clnt_ping_cbk, NULL, 0,
NULL, 0, NULL, frame, NULL, 0, NULL, 0, NULL);
if (ret) {
gf_log (THIS->name, GF_LOG_ERROR,
"failed to start ping timer");
}
else {
/* ping successfully queued in list of saved frames
* for the connection*/
pthread_mutex_lock (&conn->lock);
conn->pingcnt++;
pthread_mutex_unlock (&conn->lock);
}
return ret;
fail:
if (frame) {
STACK_DESTROY (frame->root);
}
return ret;
}
static void
rpc_clnt_start_ping (void *rpc_ptr)
{
struct rpc_clnt *rpc = NULL;
rpc_clnt_connection_t *conn = NULL;
struct timespec timeout = {0, };
int frame_count = 0;
rpc = (struct rpc_clnt*) rpc_ptr;
conn = &rpc->conn;
if (conn->ping_timeout == 0) {
gf_log (THIS->name, GF_LOG_DEBUG, "ping timeout is 0,"
" returning");
return;
}
pthread_mutex_lock (&conn->lock);
{
if (conn->ping_timer) {
gf_timer_call_cancel (rpc->ctx, conn->ping_timer);
conn->ping_timer = NULL;
conn->ping_started = 0;
rpc_clnt_unref (rpc);
}
if (conn->saved_frames) {
GF_ASSERT (conn->saved_frames->count >= 0);
/* treat the case where conn->saved_frames is NULL
as no pending frames */
frame_count = conn->saved_frames->count;
}
if ((frame_count == 0) || !conn->connected) {
gf_log (THIS->name, GF_LOG_DEBUG,
"returning as transport is already disconnected"
" OR there are no frames (%d || %d)",
!conn->connected, frame_count);
pthread_mutex_unlock (&conn->lock);
return;
}
timeout.tv_sec = conn->ping_timeout;
timeout.tv_nsec = 0;
rpc_clnt_ref (rpc);
conn->ping_timer =
gf_timer_call_after (rpc->ctx, timeout,
rpc_clnt_ping_timer_expired,
(void *) rpc);
if (conn->ping_timer == NULL) {
gf_log (THIS->name, GF_LOG_WARNING,
"unable to setup ping timer");
rpc_clnt_unref (rpc);
pthread_mutex_unlock (&conn->lock);
return;
} else {
conn->ping_started = 1;
}
}
pthread_mutex_unlock (&conn->lock);
rpc_clnt_ping(rpc);
}
void
rpc_clnt_check_and_start_ping (struct rpc_clnt *rpc)
{
char start_ping = 0;
pthread_mutex_lock (&rpc->conn.lock);
{
if (!rpc->conn.ping_started)
start_ping = 1;
}
pthread_mutex_unlock (&rpc->conn.lock);
if (start_ping)
rpc_clnt_start_ping ((void *)rpc);
return;
}
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