summaryrefslogtreecommitdiffstats
path: root/code/jasmine/server-tcp.c
blob: f5c83b969da2d3f985e0d10477777fb4f0c5e64f (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
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
/*##############################################################################
# Copyright (c) 2017 ZTE Coreporation and others.
# hu.zhijiang@zte.com.cn
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################*/

#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <sys/poll.h>
#include <string.h>
#include <pthread.h>

#include "buffer.h"
#include "tcp-common.h"
#include "udp-common.h"
#include "tcp-queue.h"
#include "misc.h"
#include "server.h"

#define MAX_CLIENTS 128 /* Clients per TCP server */
#define TCP_BUFF_SIZE 65536

struct cdata {
    struct tcpq *tx;
    struct tcpq *rx;
    int await; /* non-zero if we are in the middle of receiving clients requests */
    struct sockaddr_in peer;
};

struct server_status_data {
    int state; /* state machine */
    int sync_count;
    int ccount;
    struct semlink sl;
    pthread_t pchild;

    struct pollfd ds[MAX_CLIENTS + 1];
    struct cdata cd[MAX_CLIENTS + 1];
    int cindex;
    int last_buff_pkt_count;
};

void init_sdata(struct server_status_data *sdata, void *thread_args)
{
    int i;

    sdata->sl.parent = (struct semaphores *)thread_args;
    sdata->sl.this = NULL;

    sdata->state = S_PREP;
    sdata->last_buff_pkt_count = 1;
    sdata->sync_count = 0;

    for (i = 0; i < MAX_CLIENTS + 1; i++) { 
        sdata->ds[i].fd = -1; 
        sdata->ds[i].events = POLLIN;
        sdata->cd[i].tx = tcpq_queue_init(); 
        sdata->cd[i].rx = tcpq_queue_init(); 
        sdata->cd[i].await = 0;
    }
}

/* disconnect one client and compress table */
void kill_client(struct server_status_data *sdata)
{
    struct pollfd *ds = sdata->ds;
    struct cdata *cd = sdata->cd;

    close((ds + sdata->cindex)->fd);
    tcpq_queue_free((cd + sdata->cindex)->rx);
    tcpq_queue_free((cd + sdata->cindex)->tx);

    /* Move last slot to this free slot and release the last slot */
    *(ds + sdata->cindex) = *(ds + sdata->ccount - 1);
    *(cd + sdata->cindex) = *(cd + sdata->ccount - 1);
    sdata->cindex--;
    sdata->ccount--;
    client_count--;
}

void send_buffctl_to_all_clients(struct server_status_data *sdata)
{
    int i;
    long send_sz;
    void *cpy;

    /* copy header to all queues */
    send_sz = sizeof(struct buffer_ctl); 
    for (i = 1; i < sdata->ccount; i++) {
        cpy = wrapper_malloc(send_sz);
        memcpy(cpy, &buffctl, send_sz);
        tcpq_queue_tail(sdata->cd[i].tx, cpy, send_sz);
        sdata->ds[i].events |= POLLOUT;
    }
}

void send_sent_to_all_clients(struct server_status_data *sdata)
{
    int i;
    void *cpy;
    uint8_t byte = SERVER_SENT;

    /* Push data to clients */
    for (i = 1; i < sdata->ccount; i++) {
        cpy = wrapper_malloc(1);
        memcpy(cpy, &byte, 1);
        tcpq_queue_tail(sdata->cd[i].tx, cpy, 1);
        sdata->ds[i].events |= POLLOUT;
    }
}
void accept_clients(struct server_status_data *sdata)
{
	int res;
	int new_fd;
    socklen_t socklen;
    int poll_events;
    int timeout = -1;
    struct pollfd *ds = sdata->ds;
    struct cdata *cd = sdata->cd;

    ds->events = POLLIN;
    ds->revents = 0;
    sdata->ccount = 1;

    while (sdata->ccount <= MAX_CLIENTS && client_count < wait_count) {
        poll_events = poll(ds, 1, timeout);
        if (poll_events < 0) {
            crit("poll() failed");
        } else if (poll_events == 0) {
            log(2, "poll() returned with no results!");
            continue;
        }

        log(9, "poll: %d events", poll_events);

        if (ds->revents) {

            /* new connections come in */
            if (ds->revents & (POLLIN|POLLPRI)) {

                do {
                    socklen = sizeof((cd + sdata->ccount)->peer);
retry_accept:
                    new_fd = accept(ds->fd,
                                    (struct sockaddr *)&((cd + sdata->ccount)->peer),
                                    &socklen);
                	if (new_fd == -1 && errno == EINTR) {
                		goto retry_accept;
                	}

                	if (new_fd == -1) {
                		log(2, "accept() returned with error %d", errno);
                        break;
                	}

                    /* Send group info, before set non block */
                    res = write(new_fd, &mcinfo, sizeof(struct mc_info));
                    if (res < 0) {
                        log(3, "Error opening connection: %s",
                            inet_ntoa((cd + sdata->ccount)->peer.sin_addr));
                        close(new_fd);
                        continue;
                    }

                    /* Can set to non block becasue we will poll it in future. */
                    res = fcntl(new_fd, F_SETFL, O_NONBLOCK);
                    if (res == -1) {
                        log(2, "fcntl() returned with error %d", errno);
                        close(new_fd);
                        continue;
                    }

                    (ds + sdata->ccount)->fd = new_fd;

                    log(5, "New connection %d: %s",
                        sdata->ccount, inet_ntoa((cd + sdata->ccount)->peer.sin_addr));
                    sdata->ccount++;
                    client_count++;
                } while (sdata->ccount <= MAX_CLIENTS); 

            } else { 
                log(2, "Error on tcp socket");
            }

            poll_events--;
            ds->revents = 0;
        }
    }

    ds->events = 0;
}

void accept_clients_may_spawn(struct server_status_data *sdata)
{
    /* Wait the parent to let us accpet clients */
    sl_wait_parent(&(sdata->sl));

    sdata->ds[0].fd = sfd;
    accept_clients(sdata);
    if (client_count < wait_count) {
        sdata->sl.this = spawn_thread(&sdata->pchild, tcp_server_main, 1);

        /* Let child TCP servers accept connections */
        sl_release_child(&(sdata->sl));
        /* Wait until all childern TCP servers got all their clients */
        sl_wait_child(&(sdata->sl));
    }

    /* Tell parent all client are accepted/connected */
    sl_release_parent(&(sdata->sl));
}

void keep_on_receiving_client_request(struct server_status_data *sdata)
{
    char buf[TCP_BUFF_SIZE];
    void *cpy;
    struct request_ctl *req;
    uint32_t *rqb;
    struct packet_ctl *ans;
    long rq_index;
    long total_sz;

    long read_out;
    struct pollfd *ds;
    struct cdata *cd;

    ds = &(sdata->ds[sdata->cindex]);
    cd = &(sdata->cd[sdata->cindex]);

    read_out = read(ds->fd, buf, cd->await);
    if (read_out <= 0) { 
        log(5, "Client disconnected (r): %s",
            inet_ntoa(cd->peer.sin_addr));
        kill_client(sdata);
        return;
    }

    log(7, "New data (%ld + %ld) on conn %d: %s",
        read_out, tcpq_queue_dsize(cd->rx), sdata->cindex,
        inet_ntoa(cd->peer.sin_addr));
    cpy = wrapper_malloc(read_out);
    memcpy(cpy, buf, read_out);
    tcpq_queue_tail(cd->rx, cpy, read_out);
    cd->await -= read_out;

    /* Full header received */
    if (tcpq_queue_dsize(cd->rx) == sizeof(struct request_ctl)) {
        cpy = tcpq_queue_flat_peek(cd->rx, &read_out);
        req = (struct request_ctl *)cpy;
        cd->await = req->req_count * sizeof(uint32_t);
        log(6, "Client request for %u packets on %d: %s",
            req->req_count, sdata->cindex, inet_ntoa(cd->peer.sin_addr));
        /* req->rqc may be zero? So do not return from here */
    }

    /* Whole request(struct request_ctl + all rq blocks) received */
    if (cd->await == 0) {
        cpy = tcpq_dqueue_flat(cd->rx, &read_out);
        req = (struct request_ctl *)cpy;
        rqb = (uint32_t *) (cpy + sizeof(struct request_ctl));
        for (rq_index = 0; rq_index < req->req_count; rq_index++) {
            ans = packet_get(*(rqb + rq_index));
            total_sz = ans->data_size + sizeof(struct packet_ctl);
            log(6, "Send packet %u (%u bytes) on %d",
                rqb[rq_index], ans->data_size, sdata->cindex);
            cpy = wrapper_malloc(total_sz);
            memcpy(cpy, ans, total_sz);
            tcpq_queue_tail(cd->tx, cpy, total_sz);
        }

        if (rq_index > 0) {
            /* Data need to be sent out */
            ds->events |= POLLOUT;
        }
    }
}

void handle_error_event(struct server_status_data *sdata)
{
    struct cdata *cd;

    cd = &(sdata->cd[sdata->cindex]);
    log(5, "Closing connection %d: %s",
        sdata->cindex, inet_ntoa(cd->peer.sin_addr));
    kill_client(sdata);
}

void handle_client_ready(struct server_status_data *sdata)
{
    if (sdata->state == S_SYNC) {
        sdata->sync_count++;

        log(7, "Client SYNC %d of %d",
            sdata->sync_count, sdata->ccount - 1);

        if (sdata->sync_count == sdata->ccount - 1) {
            /* All client SYNC done */
            sdata->state = S_SEND;

            /* Wait child ready */
            sl_wait_child(&(sdata->sl));
            /* Tell parent I am ready, release parent */
            sl_release_parent(&(sdata->sl));

            /* Wait parent to send mcast */
            sl_wait_parent(&(sdata->sl));
            /* tell child mcast done, release child */
            sl_release_child(&(sdata->sl));

            send_sent_to_all_clients(sdata);
        }
    }
}

void handle_client_done(struct server_status_data *sdata)
{
    if (sdata->state == S_SEND) {
        log(7, "Client START %d of %d",
            sdata->sync_count, sdata->ccount - 1);

        sdata->sync_count--;
        if (sdata->sync_count == 0) {
            /* Got all client START */
            sdata->state = S_PREP;
            log(7, "All received, now tell UDP Server prepare next buffer");
            /* Remeber old buffctl.pkt_count before it change */
            sdata->last_buff_pkt_count = buffctl.pkt_count;

            /* Wait child clients done */
            sl_wait_child(&(sdata->sl));
            /* Tell parent all our clients are done, release parent */
            sl_release_parent(&(sdata->sl));
        }
    }
}

void handle_client_events(struct server_status_data *sdata)
{
    struct pollfd *ds;
    struct cdata *cd;
    int read_out;
    uint8_t msgtype;

    ds = &(sdata->ds[sdata->cindex]);
    cd = &(sdata->cd[sdata->cindex]);

    /* read message type */
    read_out = read(ds->fd, &msgtype, 1);
    if (read_out <= 0) { 
        log(5, "Client disconnected due to read error %d, ret:%d (r): %s",
            errno, read_out, inet_ntoa(cd->peer.sin_addr));
        kill_client(sdata);
        return; /* continue to check other clients */
    }

    switch (msgtype) {
    case CLIENT_READY:
        handle_client_ready(sdata);
        break;
    case CLIENT_DONE:
        handle_client_done(sdata);
        break;
    case CLIENT_REQ:
        /* wait a whole struct request_ctl */
        cd->await = sizeof(struct request_ctl);
        break;
    default: 
        log(4, "Wrong message type from %s",
            inet_ntoa(cd->peer.sin_addr));
        break;
    }
}

void handle_pullin_event(struct server_status_data *sdata)
{
    struct cdata *cd;

    cd = &(sdata->cd[sdata->cindex]);

    /* Await is set only for repeat request */
    if (cd->await) {
        keep_on_receiving_client_request(sdata);
    } else {
        handle_client_events(sdata);         
    }
}

void handle_pullout_event(struct server_status_data *sdata)
{
    char buf[TCP_BUFF_SIZE];
    struct pollfd *ds;
    struct cdata *cd;
    long transmit_sz;
    void *cpy;
    long written_in;

    ds = &(sdata->ds[sdata->cindex]);
    cd = &(sdata->cd[sdata->cindex]);

    if (cd->tx->count == 0) {
        ds->events = POLLIN; /* Just make sure */
        return;
    }

    log(7, "handle_pullout_event servs No.%d conn", sdata->cindex);

    /* If there is some data to be sent, try to do it now */
    cpy = tcpq_dequeue_head(cd->tx, &transmit_sz);          
    memcpy(buf, cpy, transmit_sz);
    free(cpy);

    written_in = write(ds->fd, buf, transmit_sz);
    if (written_in <= 0) {
        log(5, "Client disconnected (w): %s",
            inet_ntoa(cd->peer.sin_addr));
        kill_client(sdata);
        return;
    }

    if (written_in != transmit_sz) {
        log(6, "Partial wrote: %ld out of %ld bytes sent",
            written_in, transmit_sz);
        cpy = wrapper_malloc(transmit_sz - written_in);
        memcpy(cpy, buf + written_in, transmit_sz - written_in);
        tcpq_queue_head(cd->tx, cpy, transmit_sz - written_in);
    } else {
        log(7, "Sent %ld bytes to %s",
            written_in, inet_ntoa(cd->peer.sin_addr));
        if (cd->tx->count == 0) {
            /* Do not listen pollout event anymore */
            ds->events = POLLIN;
        }
    }
}

void check_clients(struct server_status_data *sdata)
{
    int poll_events;
    struct pollfd *ds;
    int timeout = -1;

    if (sdata->ccount == 1) {
        log(5, "No more clients, start exiting. s,c,p:%d,%d,%d",
            sdata->state, sdata->ccount, buffctl.pkt_count);
        /* No client existed */
        switch(sdata->state) {
        case S_SYNC: 
            /* Wait all children ready */
            sl_wait_child(&(sdata->sl));
            /* Tell parent I am ready, release parent */
            sl_release_parent(&(sdata->sl));

            /* Wait parent to send mcast */
            sl_wait_parent(&(sdata->sl));
            /* Tell child mcast done, release child */
            sl_release_child(&(sdata->sl));
        case S_SEND:
            sdata->state = S_PREP;
            /* Remeber old buffctl.pkt_count before it change */
            sdata->last_buff_pkt_count = buffctl.pkt_count;

            /* Wait child clients done */
            sl_wait_child(&(sdata->sl));
            /* Tell parent all our clients are done */
            sl_release_parent(&(sdata->sl));
        }
        /* return to main loop to finish the dummy run */
        return;
    }

    /* poll clients only */
    poll_events = poll(&(sdata->ds[1]), sdata->ccount - 1, timeout);
    if (poll_events < 0) {
        crit("poll() failed");
    } else if (poll_events == 0) {
        log(2, "poll() returned with no results!");
        return;
    }

    log(9, "poll clients: %d events", poll_events);
    
    /* check all connected clients */
    for (sdata->cindex = 1; sdata->cindex < sdata->ccount; sdata->cindex++) {
        ds = &(sdata->ds[sdata->cindex]);
        if (!ds->revents) {
            continue;
        }

        if (ds->revents & (POLLERR|POLLHUP|POLLNVAL)) {
            handle_error_event(sdata);
        } else if (ds->revents & (POLLIN|POLLPRI)) {
            handle_pullin_event(sdata);
        } else if (ds->revents & POLLOUT) {
            handle_pullout_event(sdata);
        }
    }
}

void * tcp_server_main(void *args)
{  
    int i;
    struct server_status_data ssdata;
    struct server_status_data *sdata;

    sdata = &ssdata;
    init_sdata(sdata, args);

    accept_clients_may_spawn(sdata);

    while (1) {
        if (sdata->state == S_PREP) {
            /* Wait UDP server to prepare the buffctl of this round to send */
            sl_wait_parent(&(sdata->sl));
            log(6, "After waiting UDP server preparation. s,c,p:%d,%d,%d",
                sdata->state, sdata->ccount - 1, buffctl.pkt_count);
            /* Tell children buffer pareparation done, release child */
            sl_release_child(&(sdata->sl));
            send_buffctl_to_all_clients(sdata);
            sdata->state = S_SYNC;
        }

        check_clients(sdata);

        if (sdata->state == S_PREP && sdata->last_buff_pkt_count == 0) {
            log(5, "No more output, TCP server finished");
            if (sdata->sl.this && pthread_join(sdata->pchild, 0) < 0) {
                crit("pthread_join()");
            }

            /* shutdown conn to clients */
            for (i = sdata->ccount - 1; i > 0; i--) {
                shutdown((sdata->ds[i]).fd, 2);
            }

            if (!sdata->sl.this) {
                /* leaf server */
                close(sfd);
                sfd = -1;
            }
            return 0;
        }
    }
}