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];
} 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

  Safefree (our);

  vio->read     = vio_read;
  vio->write    = vio_write;
  vio->vioclose = vio_close;

  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 (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?");

        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;

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

Revision:	1.11
Committed:	Sat Aug 3 02:11:27 2013 UTC (10 years, 10 months ago) by root
Branch:	MAIN
Changes since 1.10:	+1 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.11	#include <errno.h>
2	root	1.1	#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	root	1.7	#if HAVE_EV
12			# include "EVAPI.h"
13			# include "CoroAPI.h"
14			#endif
15
16	root	1.3	#define IN_DESTRUCT PL_dirty
17
18	root	1.1	typedef U16 uint16;
19
20			/* cached function gv's */
21			static CV readable, writable;
22	root	1.7	static int use_ev;
23	root	1.1
24			#include "violite.h"
25
26			#define CoMy_MAGIC 0x436f4d79
27
28			typedef struct {
29	root	1.10	#if DESC_IS_PTR
30			char desc[30];
31			const char *old_desc;
32			#endif
33	root	1.1	int magic;
34	root	1.5	SV corohandle_sv, corohandle;
35	root	1.1	int bufofs, bufcnt;
36	root	1.7	#if HAVE_EV
37			ev_io rw, ww;
38			#endif
39	root	1.1	char buf[VIO_READ_BUFFER_SIZE];
40			} ourdata;
41
42	root	1.10	#if DESC_IS_PTR
43			# define OURDATAPTR ((ourdata *)&((vio)->desc))
44			#else
45			# define DESC_OFFSET 22
46			# define OURDATAPTR (((ourdata *)((vio)->desc + DESC_OFFSET)))
47			#endif
48	root	1.1
49	root	1.8	static xlen
50			our_read (Vio *vio, xgptr p, xlen len)
51	root	1.1	{
52			ourdata *our = OURDATAPTR;
53
54			if (!our->bufcnt)
55			{
56			int rd;
57			my_bool dummy;
58
59			vio->vioblocking (vio, 0, &dummy);
60
61			for (;;)
62			{
63			rd = recv (vio->sd, our->buf, sizeof (our->buf), 0);
64
65			if (rd >= 0 \|\| errno != EAGAIN)
66			break;
67
68	root	1.7	#if HAVE_EV
69			if (use_ev)
70			{
71			our->rw.data = (void *)sv_2mortal (SvREFCNT_inc (CORO_CURRENT));
72			ev_io_start (EV_DEFAULT_UC, &(our->rw));
73			CORO_SCHEDULE;
74			ev_io_stop (EV_DEFAULT_UC, &(our->rw)); /* avoids races */
75			}
76			else
77			#endif
78			{
79			dSP;
80			PUSHMARK (SP);
81			XPUSHs (our->corohandle);
82			PUTBACK;
83			call_sv ((SV *)readable, G_VOID \| G_DISCARD);
84			}
85	root	1.1	}
86
87			if (rd <= 0)
88			return rd;
89
90			our->bufcnt = rd;
91			our->bufofs = 0;
92			}
93
94			if (our->bufcnt < len)
95			len = our->bufcnt;
96
97			memcpy (p, our->buf + our->bufofs, len);
98			our->bufofs += len;
99			our->bufcnt -= len;
100
101			return len;
102			}
103
104	root	1.8	static xlen
105			our_write (Vio *vio, cxgptr p, xlen len)
106	root	1.1	{
107			char ptr = (char )p;
108			my_bool dummy;
109
110			vio->vioblocking (vio, 0, &dummy);
111
112			while (len > 0)
113			{
114			int wr = send (vio->sd, ptr, len, 0);
115
116			if (wr > 0)
117			{
118			ptr += wr;
119			len -= wr;
120			}
121			else if (errno == EAGAIN)
122			{
123	root	1.7	ourdata *our = OURDATAPTR;
124
125			#if HAVE_EV
126			if (use_ev)
127			{
128			our->ww.data = (void *)sv_2mortal (SvREFCNT_inc (CORO_CURRENT));
129			ev_io_start (EV_DEFAULT_UC, &(our->ww));
130			CORO_SCHEDULE;
131			ev_io_stop (EV_DEFAULT_UC, &(our->ww)); /* avoids races */
132			}
133			else
134			#endif
135			{
136			dSP;
137			PUSHMARK (SP);
138			XPUSHs (our->corohandle);
139			PUTBACK;
140			call_sv ((SV *)writable, G_VOID \| G_DISCARD);
141			}
142	root	1.1	}
143			else if (ptr == (char *)p)
144			return -1;
145			else
146			break;
147			}
148
149			return ptr - (char *)p;
150			}
151
152	root	1.5	static int
153			our_close (Vio *vio)
154			{
155	root	1.7	ourdata *our = OURDATAPTR;
156
157	root	1.5	if (vio->read != our_read)
158			croak ("vio.read has unexpected content during unpatch - wtf?");
159
160			if (vio->write != our_write)
161			croak ("vio.write has unexpected content during unpatch - wtf?");
162
163			if (vio->vioclose != our_close)
164			croak ("vio.vioclose has unexpected content during unpatch - wtf?");
165
166	root	1.7	#if HAVE_EV
167			if (use_ev)
168			{
169			ev_io_stop (EV_DEFAULT_UC, &(our->rw));
170			ev_io_stop (EV_DEFAULT_UC, &(our->ww));
171			}
172			#endif
173
174			SvREFCNT_dec (our->corohandle);
175			SvREFCNT_dec (our->corohandle_sv);
176	root	1.5
177	root	1.10	#if DESC_IS_PTR
178			vio->desc = our->old_desc;
179			#endif
180
181	root	1.7	Safefree (our);
182	root	1.5
183			vio->read = vio_read;
184			vio->write = vio_write;
185			vio->vioclose = vio_close;
186
187			vio->vioclose (vio);
188			}
189
190	root	1.7	#if HAVE_EV
191			static void
192			iocb (EV_P_ ev_io *w, int revents)
193			{
194			ev_io_stop (EV_A, w);
195			CORO_READY ((SV *)w->data);
196			}
197			#endif
198
199	root	1.1	MODULE = Coro::Mysql PACKAGE = Coro::Mysql
200
201			BOOT:
202			{
203			readable = get_cv ("Coro::Mysql::readable", 0);
204			writable = get_cv ("Coro::Mysql::writable", 0);
205			}
206
207			PROTOTYPES: ENABLE
208
209			void
210	root	1.7	_use_ev ()
211			PPCODE:
212			{
213			static int onceonly;
214
215			if (!onceonly)
216			{
217			onceonly = 1;
218			#if HAVE_EV
219			I_EV_API ("Coro::Mysql");
220			I_CORO_API ("Coro::Mysql");
221			use_ev = 1;
222			#endif
223			}
224
225			XPUSHs (use_ev ? &PL_sv_yes : &PL_sv_no);
226			}
227
228			void
229	root	1.8	_patch (IV sock, int fd, unsigned long client_version, SV corohandle_sv, SV corohandle)
230	root	1.1	CODE:
231			{
232			MYSQL my = (MYSQL )sock;
233			Vio *vio = my->net.vio;
234			ourdata *our;
235
236	root	1.8	/* matching versions are required but not sufficient */
237			if (client_version != mysql_get_client_version ())
238			croak ("DBD::mysql linked against different libmysqlclient library than Coro::Mysql (%lu vs. %lu).",
239			client_version, mysql_get_client_version ());
240
241	root	1.1	if (fd != my->net.fd)
242			croak ("DBD::mysql fd and libmysql disagree - library mismatch, unsupported transport or API changes?");
243
244			if (fd != vio->sd)
245			croak ("DBD::mysql fd and vio-sd disagree - library mismatch, unsupported transport or API changes?");
246
247	root	1.5	if (vio->vioclose != vio_close)
248	root	1.9	croak ("vio.vioclose has unexpected content - library mismatch, unsupported transport or API changes?");
249	root	1.5
250	root	1.1	if (vio->write != vio_write)
251			croak ("vio.write has unexpected content - library mismatch, unsupported transport or API changes?");
252
253	root	1.5	if (vio->read != vio_read
254			&& vio->read != vio_read_buff)
255	root	1.1	croak ("vio.read has unexpected content - library mismatch, unsupported transport or API changes?");
256
257			Newz (0, our, 1, ourdata);
258			our->magic = CoMy_MAGIC;
259	root	1.5	our->corohandle_sv = newSVsv (corohandle_sv);
260			our->corohandle = newSVsv (corohandle);
261	root	1.7	#if HAVE_EV
262			if (use_ev)
263			{
264			ev_io_init (&(our->rw), iocb, vio->sd, EV_READ);
265			ev_io_init (&(our->ww), iocb, vio->sd, EV_WRITE);
266			}
267			#endif
268	root	1.10	#if DESC_IS_PTR
269			our->old_desc = vio->desc;
270			strncpy (our->desc, vio->desc, sizeof (our->desc));
271			our->desc [sizeof (our->desc) - 1] = 0;
272			#else
273	root	1.1	vio->desc [DESC_OFFSET - 1] = 0;
274	root	1.10	#endif
275	root	1.1	OURDATAPTR = our;
276
277	root	1.5	vio->vioclose = our_close;
278			vio->write = our_write;
279			vio->read = our_read;
280	root	1.1	}
281