summaryrefslogtreecommitdiffstats
path: root/rpc/rpc-lib/src/rpc-clnt-ping.c
blob: a7ff866ac994c31e2fa50928c389739ec23aa26b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
/*
  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.
*/


#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,
};

/* Must be called under conn->lock */
static int
__rpc_clnt_rearm_ping_timer (struct rpc_clnt *rpc, gf_timer_cbk_t cbk)
{
        rpc_clnt_connection_t *conn    = &rpc->conn;
        rpc_transport_t       *trans   = conn->trans;
        struct timespec        timeout = {0, };
        gf_timer_t            *timer   = NULL;

        if (conn->ping_timer) {
                gf_log_callingfn ("", GF_LOG_CRITICAL,
                                  "%s: ping timer event already scheduled",
                                  conn->trans->peerinfo.identifier);
                return -1;
        }

        timeout.tv_sec = conn->ping_timeout;
        timeout.tv_nsec = 0;

        rpc_clnt_ref (rpc);
        timer = gf_timer_call_after (rpc->ctx, timeout,
                                     cbk,
                                     (void *) rpc);
        if (timer == NULL) {
                gf_log (trans->name, GF_LOG_WARNING,
                        "unable to setup ping timer");

                /* This unref can't be the last. We just took a ref few lines
                 * above. So this can be performed under conn->lock. */
                rpc_clnt_unref (rpc);
                conn->ping_started = 0;
                return -1;
        }

        conn->ping_timer = timer;
        conn->ping_started = 1;
        return 0;
}

/* Must be called under conn->lock */
int
rpc_clnt_remove_ping_timer_locked (struct rpc_clnt *rpc)
{
        rpc_clnt_connection_t *conn  = &rpc->conn;
        gf_timer_t            *timer = NULL;

        if (conn->ping_timer) {
                timer = conn->ping_timer;
                conn->ping_timer = NULL;
                gf_timer_call_cancel (rpc->ctx, timer);
                conn->ping_started = 0;
                return 1;

        }

        /* This is to account for rpc_clnt_disable that might have set
         *  conn->trans to NULL. */
        if (conn->trans)
                gf_log_callingfn ("", GF_LOG_DEBUG, "%s: ping timer event "
                                  "already removed",
                                   conn->trans->peerinfo.identifier);

        return 0;
}

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 timeval           current            = {0, };
        int                      unref              = 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);
        {
                unref = rpc_clnt_remove_ping_timer_locked (rpc);

                gettimeofday (&current, 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");

                        if (__rpc_clnt_rearm_ping_timer (rpc,
                                         rpc_clnt_ping_timer_expired) == -1) {
                                gf_log (trans->name, GF_LOG_WARNING,
                                        "unable to setup ping timer");
                        }

                } else {
                        conn->ping_started = 0;
                        disconnect = 1;
                }
        }
        pthread_mutex_unlock (&conn->lock);

        if (unref)
                rpc_clnt_unref (rpc);

        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, };
        int                   unref    = 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) {
                        unref = rpc_clnt_remove_ping_timer_locked (rpc);
                        if (unref) {
                                gf_log (this->name, GF_LOG_WARNING,
                                        "socket or ib related error");

                        } else {
                                /* timer expired and transport bailed out */
                                gf_log (this->name, GF_LOG_WARNING,
                                        "socket disconnected");

                        }
                        conn->ping_started = 0;
                        goto unlock;
                }

                unref = rpc_clnt_remove_ping_timer_locked (rpc);
                if (__rpc_clnt_rearm_ping_timer (rpc,
                                                 rpc_clnt_start_ping) == -1) {
                        gf_log (this->name, GF_LOG_WARNING,
                                "failed to set the ping timer");
                }

        }
unlock:
        pthread_mutex_unlock (&conn->lock);
out:
        if (unref)
                rpc_clnt_unref (rpc);

        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)
                return ret;

        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;

}

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;
        int                      unref       = 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);
        {
                unref = rpc_clnt_remove_ping_timer_locked (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);
                        if (unref)
                                rpc_clnt_unref (rpc);
                        return;
                }

                if (__rpc_clnt_rearm_ping_timer (rpc,
                                         rpc_clnt_ping_timer_expired) == -1) {
                        gf_log (THIS->name, GF_LOG_WARNING,
                                "unable to setup ping timer");
                        pthread_mutex_unlock (&conn->lock);
                        if (unref)
                                rpc_clnt_unref (rpc);
                        return;

                }

        }
        pthread_mutex_unlock (&conn->lock);
        if (unref)
                rpc_clnt_unref (rpc);

        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;
}