1 /* $Id: perlread.c,v 1.8.2.2 2004-09-03 10:36:26 adam Exp $
2 Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004
5 This file is part of the Zebra server.
7 Zebra is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 Zebra is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with Zebra; see the file LICENSE.zebra. If not, write to the
19 Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
33 #include <yaz/tpath.h>
39 #define GRS_PERL_MODULE_NAME_MAXLEN 255
41 /* Context information for the filter */
43 PerlInterpreter *perli;
44 PerlInterpreter *origi;
46 char filterClass[GRS_PERL_MODULE_NAME_MAXLEN];
49 int (*readf)(void *, char *, size_t);
50 off_t (*seekf)(void *, off_t);
51 off_t (*tellf)(void *);
52 void (*endf)(void *, off_t);
60 /* Constructor call for the filter object */
61 void Filter_create (struct perl_context *context)
67 XPUSHs(sv_2mortal(newSVpv(context->filterClass,
68 strlen(context->filterClass)))) ;
70 sv_setref_pv(msv, "_p_perl_context", (void*)context);
73 call_method("new", G_EVAL);
76 context->filterRef = POPs;
81 Execute the process call on the filter. This is a bit dirty.
82 The perl code is going to get dh and nmem from the context trough callbacks,
83 then call readf, to get the stream, and then set the res (d1 node)
84 in the context. However, it's safer, to let swig do as much of wrapping
87 int Filter_process (struct perl_context *context)
99 XPUSHs(context->filterRef);
101 call_method("_process", 0);
113 This one is called to transfer the results of a readf. It's going to create
114 a temporary variable there...
116 So the call stack is something like:
119 ->Filter_process(context) [C]
120 -> _process($context) [Perl]
121 -> grs_perl_get_dh($context) [Perl]
122 -> grs_perl_get_dh(context) [C]
123 -> grs_perl_get_mem($context) [Perl]
124 -> grs_perl_get_mem(context) [C]
127 -> grs_perl_readf($context,$len) [Perl]
128 -> grs_perl_readf(context, len) [C]
129 ->(*context->readf)(context->fh, buf, len) [C]
130 -> Filter_store_buff(context, buf, r) [C]
131 -> _store_buff($buff) [Perl]
132 [... returns buff and length ...]
134 [... returns d1 node ...]
135 -> grs_perl_set_res($context, $node) [Perl]
136 -> grs_perl_set_res(context, node) [C]
138 [... The result is in context->res ...]
140 Dirty, isn't it? It may become nicer, if I'll have some more time to work on
141 it. However, these changes are not going to hurt the filter api, as
142 Filter.pm, which is inherited into all specific filter implementations
143 can hide this whole compexity behind.
146 void Filter_store_buff (struct perl_context *context, char *buff, size_t len)
154 XPUSHs(context->filterRef);
155 XPUSHs(sv_2mortal(newSVpv(buff, len)));
157 call_method("_store_buff", 0);
165 /* The "file" manipulation function wrappers */
166 int grs_perl_readf(struct perl_context *context, size_t len)
169 char *buf = (char *) xmalloc (len+1);
170 r = (*context->readf)(context->fh, buf, len);
171 if (r > 0) Filter_store_buff (context, buf, r);
176 int grs_perl_readline(struct perl_context *context)
179 char *buf = (char *) xmalloc (4096);
182 while ((r = (*context->readf)(context->fh,p,1)) && (p-buf < 4095)) {
184 if (*(p-1) == 10) break;
189 if (p != buf) Filter_store_buff (context, buf, p - buf);
194 char grs_perl_getc(struct perl_context *context)
198 if ((r = (*context->readf)(context->fh,p,1))) {
205 off_t grs_perl_seekf(struct perl_context *context, off_t offset)
207 return ((*context->seekf)(context->fh, offset));
210 off_t grs_perl_tellf(struct perl_context *context)
212 return ((*context->tellf)(context->fh));
215 void grs_perl_endf(struct perl_context *context, off_t offset)
217 (*context->endf)(context->fh, offset);
220 /* Get pointers from the context. Easyer to wrap this by SWIG */
221 data1_handle *grs_perl_get_dh(struct perl_context *context)
223 return(&context->dh);
226 NMEM *grs_perl_get_mem(struct perl_context *context)
228 return(&context->mem);
231 /* Set the result in the context */
232 void grs_perl_set_res(struct perl_context *context, data1_node *n)
237 /* The filter handlers (init, destroy, read) */
238 static void *grs_init_perl(void)
240 struct perl_context *context =
241 (struct perl_context *) xmalloc (sizeof(*context));
243 /* If there is an interpreter (context) running, - we are calling
244 indexing and retrieval from the perl API - we don't create a new one. */
245 #if PERL_VERSION >= 8
246 /* with Perl 5.8 context may be non-NULL even though it's not there! */
249 context->origi = PERL_GET_CONTEXT;
251 if (context->origi == NULL) {
252 context->perli = perl_alloc();
253 PERL_SET_CONTEXT(context->perli);
254 logf (LOG_LOG, "Initializing new perl interpreter context (%p)",context->perli);
256 logf (LOG_LOG, "Using existing perl interpreter context (%p)",context->origi);
258 context->perli_ready = 0;
259 strcpy(context->filterClass, "");
263 void grs_destroy_perl(void *clientData)
265 struct perl_context *context = (struct perl_context *) clientData;
267 logf (LOG_LOG, "Destroying perl interpreter context");
268 if (context->perli_ready) {
273 if (context->origi == NULL) perl_destruct(context->perli);
275 if (context->origi == NULL) perl_free(context->perli);
279 static data1_node *grs_read_perl (struct grs_read_info *p)
281 struct perl_context *context = (struct perl_context *) p->clientData;
282 char *filterClass = p->type;
284 /* The "file" manipulation function wrappers */
285 context->readf = p->readf;
286 context->seekf = p->seekf;
287 context->tellf = p->tellf;
288 context->endf = p->endf;
290 /* The "file", data1 and NMEM handles */
293 context->mem = p->mem;
295 /* If the class was not interpreted before... */
296 /* This is not too efficient, when indexing with many different filters... */
297 if (strcmp(context->filterClass,filterClass)) {
299 char modarg[GRS_PERL_MODULE_NAME_MAXLEN + 2];
300 char initarg[GRS_PERL_MODULE_NAME_MAXLEN + 2];
301 char *arglist[6] = { "", "-I", "", "-M", "-e", "" };
303 if (context->perli_ready) {
308 if (context->origi == NULL) {
309 perl_destruct(context->perli);
312 if (context->origi == NULL) {
313 perl_construct(context->perli);
321 context->perli_ready = 1;
323 /* parse, and run the init call */
324 if (context->origi == NULL) {
325 logf (LOG_LOG, "Interpreting filter class:%s", filterClass);
327 arglist[2] = (char *) data1_get_tabpath(p->dh);
328 sprintf(modarg,"-M%s",filterClass);
329 arglist[3] = (char *) &modarg;
330 sprintf(initarg,"%s->init;",filterClass);
331 arglist[5] = (char *) &initarg;
333 perl_parse(context->perli, PERL_XS_INIT, 6, arglist, NULL);
334 perl_run(context->perli);
337 strcpy(context->filterClass, filterClass);
339 /* create the filter object as a filterClass blessed reference */
340 Filter_create(context);
343 /* Wow... if calling with individual update_record calls from perl,
344 the filter object reference may go out of scope... */
345 if (!sv_isa(context->filterRef, context->filterClass)) {
346 Filter_create(context);
347 logf (LOG_DEBUG,"Filter recreated");
350 if (!SvTRUE(context->filterRef))
352 logf (LOG_WARN,"Failed to initialize perl filter %s",context->filterClass);
356 /* call the process method */
357 Filter_process(context);
359 /* return the created data1 node */
360 return (context->res);
363 static struct recTypeGrs perl_type = {
370 RecTypeGrs recTypeGrs_perl = &perl_type;