Coro-Mysql/Mysql.xs

#include <errno.h>
#include <unistd.h>
#include <fcntl.h>

#include <mysql.h>

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#if HAVE_EV
# include "EVAPI.h"
# include "CoroAPI.h"
#endif

#define IN_DESTRUCT PL_dirty

typedef U16 uint16;

/* cached function gv's */
static CV *readable, *writable;
static int use_ev;

#include "violite.h"

#define CoMy_MAGIC 0x436f4d79

typedef struct {
#if DESC_IS_PTR
  char desc[30];
  const char *old_desc;
#endif
  int magic;
  SV *corohandle_sv, *corohandle;
  int bufofs, bufcnt;
#if HAVE_EV
  ev_io rw, ww;
#endif
  char buf[VIO_READ_BUFFER_SIZE];
  size_t  (*old_read)(Vio*, uchar *, size_t);
  size_t  (*old_write)(Vio*, const uchar *, size_t);
  int     (*old_vioclose)(Vio*);
} ourdata;

#if DESC_IS_PTR
# define OURDATAPTR (*(ourdata **)&((vio)->desc))
#else
# define DESC_OFFSET 22
# define OURDATAPTR (*((ourdata **)((vio)->desc + DESC_OFFSET)))
#endif

static xlen
our_read (Vio *vio, xgptr p, xlen len)
{
  ourdata *our = OURDATAPTR;

  if (!our->bufcnt)
    {
      int rd;
      my_bool dummy;

      vio->vioblocking (vio, 0, &dummy);

      for (;;)
        {
          rd = recv (vio->sd, our->buf, sizeof (our->buf), 0);

          if (rd >= 0 || errno != EAGAIN)
            break;

#if HAVE_EV
          if (use_ev)
            {
              our->rw.data = (void *)sv_2mortal (SvREFCNT_inc (CORO_CURRENT));
              ev_io_start (EV_DEFAULT_UC, &(our->rw));
              CORO_SCHEDULE;
              ev_io_stop (EV_DEFAULT_UC, &(our->rw)); /* avoids races */
            }
          else
#endif
            {
              dSP;
              PUSHMARK (SP);
              XPUSHs (our->corohandle);
              PUTBACK;
              call_sv ((SV *)readable, G_VOID | G_DISCARD);
            }
        }

      if (rd <= 0)
        return rd;

      our->bufcnt = rd;
      our->bufofs = 0;
    }

  if (our->bufcnt < len)
    len = our->bufcnt;

  memcpy (p, our->buf + our->bufofs, len);
  our->bufofs += len;
  our->bufcnt -= len;

  return len;
}

static xlen
our_write (Vio *vio, cxgptr p, xlen len)
{
  char *ptr = (char *)p;
  my_bool dummy;

  vio->vioblocking (vio, 0, &dummy);

  while (len > 0)
    {
      int wr = send (vio->sd, ptr, len, 0);

      if (wr > 0)
        {
          ptr += wr;
          len -= wr;
        }
      else if (errno == EAGAIN)
        {
          ourdata *our = OURDATAPTR;

#if HAVE_EV
          if (use_ev)
            {
              our->ww.data = (void *)sv_2mortal (SvREFCNT_inc (CORO_CURRENT));
              ev_io_start (EV_DEFAULT_UC, &(our->ww));
              CORO_SCHEDULE;
              ev_io_stop (EV_DEFAULT_UC, &(our->ww)); /* avoids races */
            }
          else
#endif
            {
              dSP;
              PUSHMARK (SP);
              XPUSHs (our->corohandle);
              PUTBACK;
              call_sv ((SV *)writable, G_VOID | G_DISCARD);
            }
        }
      else if (ptr == (char *)p)
        return -1;
      else
        break;
    }

  return ptr - (char *)p;
}

static int
our_close (Vio *vio)
{
  ourdata *our = OURDATAPTR;

  if (vio->read != our_read)
    croak ("vio.read has unexpected content during unpatch - wtf?");

  if (vio->write != our_write)
    croak ("vio.write has unexpected content during unpatch - wtf?");

  if (vio->vioclose != our_close)
    croak ("vio.vioclose has unexpected content during unpatch - wtf?");

#if HAVE_EV
  if (use_ev)
    {
      ev_io_stop (EV_DEFAULT_UC, &(our->rw));
      ev_io_stop (EV_DEFAULT_UC, &(our->ww));
    }
#endif

  SvREFCNT_dec (our->corohandle);
  SvREFCNT_dec (our->corohandle_sv);

#if DESC_IS_PTR
  vio->desc = our->old_desc;
#endif

  vio->vioclose = our->old_vioclose;
  vio->write    = our->old_write;
  vio->read     = our->old_read;

  Safefree (our);

  vio->vioclose (vio);
}

#if HAVE_EV
static void
iocb (EV_P_ ev_io *w, int revents)
{
  ev_io_stop (EV_A, w);
  CORO_READY ((SV *)w->data);
}
#endif

MODULE = Coro::Mysql            PACKAGE = Coro::Mysql

BOOT:
{
  readable = get_cv ("Coro::Mysql::readable", 0);
  writable = get_cv ("Coro::Mysql::writable", 0);
}

PROTOTYPES: ENABLE

void
_use_ev ()
        PPCODE:
{
        static int onceonly;

        if (!onceonly)
          {
            onceonly = 1;
#if HAVE_EV
            I_EV_API ("Coro::Mysql");
            I_CORO_API ("Coro::Mysql");
            use_ev = 1;
#endif
          }

        XPUSHs (use_ev ? &PL_sv_yes : &PL_sv_no);
}

void
_patch (IV sock, int fd, unsigned long client_version, SV *corohandle_sv, SV *corohandle)
        CODE:
{
        MYSQL *my = (MYSQL *)sock;
        Vio *vio = my->net.vio;
        ourdata *our;

        /* matching versions are required but not sufficient */
        if (client_version != mysql_get_client_version ())
          croak ("DBD::mysql linked against different libmysqlclient library than Coro::Mysql (%lu vs. %lu).",
                 client_version, mysql_get_client_version ());

        if (fd != my->net.fd)
          croak ("DBD::mysql fd and libmysql disagree - library mismatch, unsupported transport or API changes?");

        if (fd != vio->sd)
          croak ("DBD::mysql fd and vio-sd disagree - library mismatch, unsupported transport or API changes?");
#if MYSQL_VERSION_ID < 100010 && !defined(MARIADB_BASE_VERSION)
        if (vio->vioclose != vio_close)
          croak ("vio.vioclose has unexpected content - library mismatch, unsupported transport or API changes?");

        if (vio->write != vio_write)
          croak ("vio.write has unexpected content - library mismatch, unsupported transport or API changes?");

        if (vio->read != vio_read
            && vio->read != vio_read_buff)
          croak ("vio.read has unexpected content - library mismatch, unsupported transport or API changes?");
#endif

        Newz (0, our, 1, ourdata);
        our->magic = CoMy_MAGIC;
        our->corohandle_sv = newSVsv (corohandle_sv);
        our->corohandle    = newSVsv (corohandle);
#if HAVE_EV
        if (use_ev)
          {
            ev_io_init (&(our->rw), iocb, vio->sd, EV_READ);
            ev_io_init (&(our->ww), iocb, vio->sd, EV_WRITE);
          }
#endif
#if DESC_IS_PTR
        our->old_desc = vio->desc;
        strncpy (our->desc, vio->desc, sizeof (our->desc));
        our->desc [sizeof (our->desc) - 1] = 0;
#else
        vio->desc [DESC_OFFSET - 1] = 0;
#endif
        OURDATAPTR = our;

        our->old_vioclose = vio->vioclose;
        our->old_write    = vio->write;
        our->old_read     = vio->read;

        vio->vioclose = our_close;
        vio->write    = our_write;
        vio->read     = our_read;
}

Revision:	1.15
Committed:	Tue Jun 3 13:38:48 2014 UTC (9 years, 11 months ago) by root
Branch:	MAIN
CVS Tags:	rel-1_27
Changes since 1.14:	+0 -1 lines
Log Message:	1.27
#	Content
1	#include <errno.h>
2	#include <unistd.h>
3	#include <fcntl.h>
4
5	#include <mysql.h>
6
7	#include "EXTERN.h"
8	#include "perl.h"
9	#include "XSUB.h"
10
11	#if HAVE_EV
12	# include "EVAPI.h"
13	# include "CoroAPI.h"
14	#endif
15
16	#define IN_DESTRUCT PL_dirty
17
18	typedef U16 uint16;
19
20	/* cached function gv's */
21	static CV readable, writable;
22	static int use_ev;
23
24	#include "violite.h"
25
26	#define CoMy_MAGIC 0x436f4d79
27
28	typedef struct {
29	#if DESC_IS_PTR
30	char desc[30];
31	const char *old_desc;
32	#endif
33	int magic;
34	SV corohandle_sv, corohandle;
35	int bufofs, bufcnt;
36	#if HAVE_EV
37	ev_io rw, ww;
38	#endif
39	char buf[VIO_READ_BUFFER_SIZE];
40	size_t (old_read)(Vio, uchar *, size_t);
41	size_t (old_write)(Vio, const uchar *, size_t);
42	int (old_vioclose)(Vio);
43	} ourdata;
44
45	#if DESC_IS_PTR
46	# define OURDATAPTR ((ourdata *)&((vio)->desc))
47	#else
48	# define DESC_OFFSET 22
49	# define OURDATAPTR (((ourdata *)((vio)->desc + DESC_OFFSET)))
50	#endif
51
52	static xlen
53	our_read (Vio *vio, xgptr p, xlen len)
54	{
55	ourdata *our = OURDATAPTR;
56
57	if (!our->bufcnt)
58	{
59	int rd;
60	my_bool dummy;
61
62	vio->vioblocking (vio, 0, &dummy);
63
64	for (;;)
65	{
66	rd = recv (vio->sd, our->buf, sizeof (our->buf), 0);
67
68	if (rd >= 0 \|\| errno != EAGAIN)
69	break;
70
71	#if HAVE_EV
72	if (use_ev)
73	{
74	our->rw.data = (void *)sv_2mortal (SvREFCNT_inc (CORO_CURRENT));
75	ev_io_start (EV_DEFAULT_UC, &(our->rw));
76	CORO_SCHEDULE;
77	ev_io_stop (EV_DEFAULT_UC, &(our->rw)); /* avoids races */
78	}
79	else
80	#endif
81	{
82	dSP;
83	PUSHMARK (SP);
84	XPUSHs (our->corohandle);
85	PUTBACK;
86	call_sv ((SV *)readable, G_VOID \| G_DISCARD);
87	}
88	}
89
90	if (rd <= 0)
91	return rd;
92
93	our->bufcnt = rd;
94	our->bufofs = 0;
95	}
96
97	if (our->bufcnt < len)
98	len = our->bufcnt;
99
100	memcpy (p, our->buf + our->bufofs, len);
101	our->bufofs += len;
102	our->bufcnt -= len;
103
104	return len;
105	}
106
107	static xlen
108	our_write (Vio *vio, cxgptr p, xlen len)
109	{
110	char ptr = (char )p;
111	my_bool dummy;
112
113	vio->vioblocking (vio, 0, &dummy);
114
115	while (len > 0)
116	{
117	int wr = send (vio->sd, ptr, len, 0);
118
119	if (wr > 0)
120	{
121	ptr += wr;
122	len -= wr;
123	}
124	else if (errno == EAGAIN)
125	{
126	ourdata *our = OURDATAPTR;
127
128	#if HAVE_EV
129	if (use_ev)
130	{
131	our->ww.data = (void *)sv_2mortal (SvREFCNT_inc (CORO_CURRENT));
132	ev_io_start (EV_DEFAULT_UC, &(our->ww));
133	CORO_SCHEDULE;
134	ev_io_stop (EV_DEFAULT_UC, &(our->ww)); /* avoids races */
135	}
136	else
137	#endif
138	{
139	dSP;
140	PUSHMARK (SP);
141	XPUSHs (our->corohandle);
142	PUTBACK;
143	call_sv ((SV *)writable, G_VOID \| G_DISCARD);
144	}
145	}
146	else if (ptr == (char *)p)
147	return -1;
148	else
149	break;
150	}
151
152	return ptr - (char *)p;
153	}
154
155	static int
156	our_close (Vio *vio)
157	{
158	ourdata *our = OURDATAPTR;
159
160	if (vio->read != our_read)
161	croak ("vio.read has unexpected content during unpatch - wtf?");
162
163	if (vio->write != our_write)
164	croak ("vio.write has unexpected content during unpatch - wtf?");
165
166	if (vio->vioclose != our_close)
167	croak ("vio.vioclose has unexpected content during unpatch - wtf?");
168
169	#if HAVE_EV
170	if (use_ev)
171	{
172	ev_io_stop (EV_DEFAULT_UC, &(our->rw));
173	ev_io_stop (EV_DEFAULT_UC, &(our->ww));
174	}
175	#endif
176
177	SvREFCNT_dec (our->corohandle);
178	SvREFCNT_dec (our->corohandle_sv);
179
180	#if DESC_IS_PTR
181	vio->desc = our->old_desc;
182	#endif
183
184	vio->vioclose = our->old_vioclose;
185	vio->write = our->old_write;
186	vio->read = our->old_read;
187
188	Safefree (our);
189
190	vio->vioclose (vio);
191	}
192
193	#if HAVE_EV
194	static void
195	iocb (EV_P_ ev_io *w, int revents)
196	{
197	ev_io_stop (EV_A, w);
198	CORO_READY ((SV *)w->data);
199	}
200	#endif
201
202	MODULE = Coro::Mysql PACKAGE = Coro::Mysql
203
204	BOOT:
205	{
206	readable = get_cv ("Coro::Mysql::readable", 0);
207	writable = get_cv ("Coro::Mysql::writable", 0);
208	}
209
210	PROTOTYPES: ENABLE
211
212	void
213	_use_ev ()
214	PPCODE:
215	{
216	static int onceonly;
217
218	if (!onceonly)
219	{
220	onceonly = 1;
221	#if HAVE_EV
222	I_EV_API ("Coro::Mysql");
223	I_CORO_API ("Coro::Mysql");
224	use_ev = 1;
225	#endif
226	}
227
228	XPUSHs (use_ev ? &PL_sv_yes : &PL_sv_no);
229	}
230
231	void
232	_patch (IV sock, int fd, unsigned long client_version, SV corohandle_sv, SV corohandle)
233	CODE:
234	{
235	MYSQL my = (MYSQL )sock;
236	Vio *vio = my->net.vio;
237	ourdata *our;
238
239	/* matching versions are required but not sufficient */
240	if (client_version != mysql_get_client_version ())
241	croak ("DBD::mysql linked against different libmysqlclient library than Coro::Mysql (%lu vs. %lu).",
242	client_version, mysql_get_client_version ());
243
244	if (fd != my->net.fd)
245	croak ("DBD::mysql fd and libmysql disagree - library mismatch, unsupported transport or API changes?");
246
247	if (fd != vio->sd)
248	croak ("DBD::mysql fd and vio-sd disagree - library mismatch, unsupported transport or API changes?");
249	#if MYSQL_VERSION_ID < 100010 && !defined(MARIADB_BASE_VERSION)
250	if (vio->vioclose != vio_close)
251	croak ("vio.vioclose has unexpected content - library mismatch, unsupported transport or API changes?");
252
253	if (vio->write != vio_write)
254	croak ("vio.write has unexpected content - library mismatch, unsupported transport or API changes?");
255
256	if (vio->read != vio_read
257	&& vio->read != vio_read_buff)
258	croak ("vio.read has unexpected content - library mismatch, unsupported transport or API changes?");
259	#endif
260
261	Newz (0, our, 1, ourdata);
262	our->magic = CoMy_MAGIC;
263	our->corohandle_sv = newSVsv (corohandle_sv);
264	our->corohandle = newSVsv (corohandle);
265	#if HAVE_EV
266	if (use_ev)
267	{
268	ev_io_init (&(our->rw), iocb, vio->sd, EV_READ);
269	ev_io_init (&(our->ww), iocb, vio->sd, EV_WRITE);
270	}
271	#endif
272	#if DESC_IS_PTR
273	our->old_desc = vio->desc;
274	strncpy (our->desc, vio->desc, sizeof (our->desc));
275	our->desc [sizeof (our->desc) - 1] = 0;
276	#else
277	vio->desc [DESC_OFFSET - 1] = 0;
278	#endif
279	OURDATAPTR = our;
280
281	our->old_vioclose = vio->vioclose;
282	our->old_write = vio->write;
283	our->old_read = vio->read;
284
285	vio->vioclose = our_close;
286	vio->write = our_write;
287	vio->read = our_read;
288	}
289