Coro-Mysql/Mysql.xs

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

#include <mysql.h>

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

#define IN_DESTRUCT PL_dirty

typedef U16 uint16;

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

#include "violite.h"

#define DESC_OFFSET 22

#define CoMy_MAGIC 0x436f4d79

typedef struct {
  int magic;
  SV *corosocket;
  int bufofs, bufcnt;
  char buf[VIO_READ_BUFFER_SIZE];
} ourdata;

#define OURDATAPTR (*((ourdata **)((vio)->desc + DESC_OFFSET)))

static int
our_read (Vio *vio, gptr p, int 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;

          {
            dSP;
            PUSHMARK (SP);
            XPUSHs (our->corosocket);
            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 int
our_write (Vio *vio, const gptr p, int 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)
        {
          dSP;
          PUSHMARK (SP);
          XPUSHs (OURDATAPTR->corosocket);
          PUTBACK;
          call_sv ((SV *)writable, G_VOID | G_DISCARD);
        }
      else if (ptr == (char *)p)
        return -1;
      else
        break;
    }

  return ptr - (char *)p;
}

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

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

PROTOTYPES: ENABLE

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

        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->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->corosocket = newSVsv (corosocket);

        vio->desc [DESC_OFFSET - 1] = 0;
        OURDATAPTR = our;

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

void
_unpatch (IV sock)
        CODE:
        if (!IN_DESTRUCT)
          {
            /* we currently leak data during global destruction */
            /* perl makes it extremely hard to do otherwise, though */
            MYSQL *my = (MYSQL *)sock;
            Vio *vio = my->net.vio;
            my_bool dummy;

            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?");

            SvREFCNT_dec (OURDATAPTR->corosocket);

            Safefree (OURDATAPTR);

            vio->read  = vio_read;
            vio->write = vio_write;
          }


Revision:	1.4
Committed:	Sat Jun 20 20:44:09 2009 UTC (14 years, 11 months ago) by root
Branch:	MAIN
Changes since 1.3:	+1 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#include <sys/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	root	1.3	#define IN_DESTRUCT PL_dirty
12
13	root	1.1	typedef U16 uint16;
14
15			/* cached function gv's */
16			static CV readable, writable;
17
18			#include "violite.h"
19
20			#define DESC_OFFSET 22
21
22			#define CoMy_MAGIC 0x436f4d79
23
24			typedef struct {
25			int magic;
26			SV *corosocket;
27			int bufofs, bufcnt;
28			char buf[VIO_READ_BUFFER_SIZE];
29			} ourdata;
30
31			#define OURDATAPTR (((ourdata *)((vio)->desc + DESC_OFFSET)))
32
33			static int
34			our_read (Vio *vio, gptr p, int len)
35			{
36			ourdata *our = OURDATAPTR;
37
38			if (!our->bufcnt)
39			{
40			int rd;
41			my_bool dummy;
42
43			vio->vioblocking (vio, 0, &dummy);
44
45			for (;;)
46			{
47			rd = recv (vio->sd, our->buf, sizeof (our->buf), 0);
48
49			if (rd >= 0 \|\| errno != EAGAIN)
50			break;
51
52			{
53			dSP;
54			PUSHMARK (SP);
55			XPUSHs (our->corosocket);
56			PUTBACK;
57			call_sv ((SV *)readable, G_VOID \| G_DISCARD);
58			}
59			}
60
61			if (rd <= 0)
62			return rd;
63
64			our->bufcnt = rd;
65			our->bufofs = 0;
66			}
67
68			if (our->bufcnt < len)
69			len = our->bufcnt;
70
71			memcpy (p, our->buf + our->bufofs, len);
72			our->bufofs += len;
73			our->bufcnt -= len;
74
75			return len;
76			}
77
78			static int
79			our_write (Vio *vio, const gptr p, int len)
80			{
81			char ptr = (char )p;
82			my_bool dummy;
83
84			vio->vioblocking (vio, 0, &dummy);
85
86			while (len > 0)
87			{
88			int wr = send (vio->sd, ptr, len, 0);
89
90			if (wr > 0)
91			{
92			ptr += wr;
93			len -= wr;
94			}
95			else if (errno == EAGAIN)
96			{
97			dSP;
98			PUSHMARK (SP);
99			XPUSHs (OURDATAPTR->corosocket);
100			PUTBACK;
101			call_sv ((SV *)writable, G_VOID \| G_DISCARD);
102			}
103			else if (ptr == (char *)p)
104			return -1;
105			else
106			break;
107			}
108
109			return ptr - (char *)p;
110			}
111
112			MODULE = Coro::Mysql PACKAGE = Coro::Mysql
113
114			BOOT:
115			{
116			readable = get_cv ("Coro::Mysql::readable", 0);
117			writable = get_cv ("Coro::Mysql::writable", 0);
118			}
119
120			PROTOTYPES: ENABLE
121
122			void
123			_patch (IV sock, int fd, SV *corosocket)
124			CODE:
125			{
126			MYSQL my = (MYSQL )sock;
127			Vio *vio = my->net.vio;
128			ourdata *our;
129
130			if (fd != my->net.fd)
131			croak ("DBD::mysql fd and libmysql disagree - library mismatch, unsupported transport or API changes?");
132
133			if (fd != vio->sd)
134			croak ("DBD::mysql fd and vio-sd disagree - library mismatch, unsupported transport or API changes?");
135
136			if (vio->write != vio_write)
137			croak ("vio.write has unexpected content - library mismatch, unsupported transport or API changes?");
138
139			if (vio->read != vio_read && vio->read != vio_read_buff)
140			croak ("vio.read has unexpected content - library mismatch, unsupported transport or API changes?");
141
142			Newz (0, our, 1, ourdata);
143			our->magic = CoMy_MAGIC;
144			our->corosocket = newSVsv (corosocket);
145
146			vio->desc [DESC_OFFSET - 1] = 0;
147			OURDATAPTR = our;
148
149			vio->write = our_write;
150			vio->read = our_read;
151			}
152
153			void
154			_unpatch (IV sock)
155			CODE:
156	root	1.4	if (!IN_DESTRUCT)
157	root	1.3	{
158			/* we currently leak data during global destruction */
159			/* perl makes it extremely hard to do otherwise, though */
160			MYSQL my = (MYSQL )sock;
161			Vio *vio = my->net.vio;
162			my_bool dummy;
163
164			if (vio->read != our_read)
165			croak ("vio.read has unexpected content during unpatch - wtf?");
166
167			if (vio->write != our_write)
168			croak ("vio.write has unexpected content during unpatch - wtf?");
169	root	1.1
170	root	1.3	SvREFCNT_dec (OURDATAPTR->corosocket);
171	root	1.1
172	root	1.3	Safefree (OURDATAPTR);
173	root	1.2
174	root	1.3	vio->read = vio_read;
175			vio->write = vio_write;
176			}
177	root	1.1
178
179