Annotation of parser3/src/classes/op.C, revision 1.127.2.21
1.1 paf 1: /** @file
1.9 paf 2: Parser: parser @b operators.
1.1 paf 3:
1.127.2.5 paf 4: Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com)
1.71 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.98 paf 6: */
1.1 paf 7:
1.127.2.21! paf 8: static const char* IDENT_OP_C="$Date: 2003/03/05 16:35:28 $";
1.1 paf 9:
1.13 paf 10: #include "classes.h"
1.127.2.8 paf 11: #include "pa_vmethod_frame.h"
12:
1.1 paf 13: #include "pa_common.h"
14: #include "pa_request.h"
15: #include "pa_vint.h"
16: #include "pa_sql_connection.h"
1.79 paf 17: #include "pa_vdate.h"
1.105 paf 18: #include "pa_vmethod_frame.h"
1.127.2.21! paf 19: #include "pa_vclass.h"
1.1 paf 20:
1.18 parser 21: // limits
22:
23: #define MAX_LOOPS 10000
24:
1.10 paf 25: // defines
26:
1.82 paf 27: #define CASE_DEFAULT_VALUE "DEFAULT"
1.11 paf 28:
1.10 paf 29: // class
30:
1.113 paf 31: class VClassMAIN: public VClass {
1.10 paf 32: public:
1.127.2.10 paf 33: VClassMAIN();
1.10 paf 34: };
35:
1.127.2.10 paf 36: // defines for statics
37:
38: #define SWITCH_DATA_NAME "SWITCH-DATA"
39: #define CACHE_DATA_NAME "CACHE-DATA"
40: #define EXCEPTION_VAR_NAME "exception"
41: #define EXCEPTION_TYPE_PART_NAME "type"
42: #define EXCEPTION_SOURCE_PART_NAME "source"
43: #define EXCEPTION_COMMENT_PART_NAME "comment"
44: #define EXCEPTION_HANDLED_PART_NAME "handled"
45:
46: // statics
47:
48: //^switch ^case
49: static StringPtr switch_data_name(new String(SWITCH_DATA_NAME));
50: //^cache
51: static StringPtr cache_data_name(new String(CACHE_DATA_NAME));
52:
53: static StringPtr exception_var_name(new String(EXCEPTION_VAR_NAME));
54: static StringPtr exception_type_part_name(new String(EXCEPTION_TYPE_PART_NAME));
55: static StringPtr exception_source_part_name(new String(EXCEPTION_SOURCE_PART_NAME));
56: static StringPtr exception_comment_part_name(new String(EXCEPTION_COMMENT_PART_NAME));
57: static StringPtr exception_handled_part_name(new String(EXCEPTION_HANDLED_PART_NAME));
58:
1.127.2.1 paf 59: // helpers
60:
1.127.2.10 paf 61: class Untaint_lang_name2enum: public Hash<StringPtr, int> {
62: public:
63: Untaint_lang_name2enum() {
64: #define ULN(name, LANG) \
65: put(StringPtr(new String(name)), (value_type)String::UL_##LANG);
66: ULN("as-is", AS_IS);
67: ULN("optimized-as-is", AS_IS|String::UL_OPTIMIZE_BIT);
68: ULN("file-spec", FILE_SPEC);
69: ULN("http-header", HTTP_HEADER);
70: ULN("mail-header", MAIL_HEADER);
71: ULN("uri", URI);
72: ULN("table", TABLE);
73: ULN("sql", SQL);
74: ULN("js", JS);
75: ULN("xml", XML);
76: ULN("optimized-xml", XML|String::UL_OPTIMIZE_BIT);
77: ULN("html", HTML);
78: ULN("optimized-html", HTML|String::UL_OPTIMIZE_BIT);
79: #undef ULN
80: }
81: } untaint_lang_name2enum;
1.127.2.1 paf 82:
1.10 paf 83: // methods
84:
1.127.2.13 paf 85: static void _if(Request& r, StringPtr /*method_name*/, MethodParams* params) {
86: ValuePtr condition_code=params->as_junction(0, "condition must be expression");
1.1 paf 87:
1.81 paf 88: bool condition=r.process_to_value(condition_code,
1.83 paf 89: /*0/*no name* /,*/
1.127.2.10 paf 90: false/*don't intercept string*/)->as_bool();
1.6 paf 91: if(condition)
1.127.2.13 paf 92: r.write_pass_lang(r.process(params->as_junction(1, "'then' parameter must be code")));
93: else if(params->count()>2)
94: r.write_pass_lang(r.process(params->as_junction(2, "'else' parameter must be code")));
1.1 paf 95: }
96:
1.127.2.13 paf 97: static void _untaint(Request& r, StringPtr method_name, MethodParams* params) {
1.1 paf 98: Pool& pool=r.pool();
99:
1.127.2.18 paf 100: String_UL lang;
1.127.2.13 paf 101: if(params->count()==1)
1.59 paf 102: lang=String::UL_AS_IS; // mark as simply 'tainted'. useful in html from sql
103: else {
1.127.2.13 paf 104: StringPtr lang_name=params->as_string(0, "lang must be string");
1.127.2.10 paf 105: lang=untaint_lang_name2enum.get(lang_name);
1.59 paf 106: if(!lang)
1.78 paf 107: throw Exception(0,
1.127.2.10 paf 108: lang_name,
1.59 paf 109: "invalid taint language");
110: }
1.1 paf 111:
112: {
1.127.2.13 paf 113: ValuePtr vbody=params->as_junction(params->count()-1, "body must be code");
1.1 paf 114:
115: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.86 paf 116: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 117: }
118: }
119:
1.127.2.13 paf 120: static void _taint(Request& r, StringPtr /*method_name*/, MethodParams* params) {
1.1 paf 121: Pool& pool=r.pool();
122:
1.127.2.18 paf 123: String_UL lang;
1.127.2.13 paf 124: if(params->count()==1)
1.1 paf 125: lang=String::UL_TAINTED; // mark as simply 'tainted'. useful in table:set
126: else {
1.127.2.13 paf 127: StringPtr lang_name=params->as_string(0, "lang must be string");
1.127.2.10 paf 128: lang=untaint_lang_name2enum.get(lang_name);
1.1 paf 129: if(!lang)
1.78 paf 130: throw Exception(0,
1.127.2.10 paf 131: lang_name,
1.3 paf 132: "invalid taint language");
1.1 paf 133: }
134:
135: {
1.127.2.13 paf 136: ValuePtr vbody=params->as_no_junction(params->count()-1, "body must not be code");
1.1 paf 137:
1.127.2.10 paf 138: String result;
1.1 paf 139: result.append(
1.127.2.10 paf 140: *vbody->as_string(&pool), // process marking tainted with that lang
1.1 paf 141: lang, true); // force result language to specified
142: r.write_pass_lang(result);
143: }
144: }
145:
1.127.2.13 paf 146: static void _process(Request& r, StringPtr method_name, MethodParams* params) {
1.97 paf 147: Pool& pool=r.pool();
1.127.2.15 paf 148: StringPtr source; // must be declared here to prevent premature destruction
1.127.2.14 paf 149: MethodPtr main_method;
1.127.2.13 paf 150: ValuePtr target_self=params->count()>1?
151: params->as_no_junction(0, "target must not be code")
1.127.2.10 paf 152: :ValuePtr(&r.get_method_frame()->caller()->self());
1.1 paf 153: {
1.127.2.13 paf 154: ValuePtr vjunction=params->as_junction(params->count()-1, "body must be code");
1.114 paf 155:
1.127.2.10 paf 156: VStateless_class *target_class=target_self->get_last_derived_class();
1.116 paf 157: if(!target_class)
158: throw Exception("parser.runtime",
1.127.2.9 paf 159: method_name,
1.116 paf 160: "no target class");
161:
1.114 paf 162: // evaluate source to process
1.127.2.15 paf 163: source=r.process_to_string(vjunction);
1.114 paf 164:
1.73 paf 165: // temporary remove language change
166: Temp_lang temp_lang(r, String::UL_PASS_APPENDED);
1.1 paf 167: // temporary zero @main so to maybe-replace it in processed code
1.127.2.10 paf 168: Temp_method temp_method_main(*target_class, main_method_name, MethodPtr(0));
1.1 paf 169: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
1.127.2.10 paf 170: Temp_method temp_method_auto(*target_class, auto_method_name, MethodPtr(0));
1.1 paf 171:
1.101 paf 172: // calculate pseudo file name of processed chars
173: // would be something like "/some/file(4) process"
174: char local_place[MAX_STRING];
175: #ifndef NO_STRING_ORIGIN
1.127.2.10 paf 176: const String_fragment::Origin& source_origin=source->origin();
177: const String_fragment::Origin& method_origin=method_name->origin();
1.101 paf 178: size_t place_size;
179: if(source_origin.file==method_origin.file)
180: place_size=snprintf(local_place, MAX_STRING, "%s(%d) %s", // same file
181: source_origin.file?source_origin.file:"unknown_file", 1+source_origin.line,
1.127.2.14 paf 182: method_name->cstr().get())+1;
1.101 paf 183: else // different files ^process{external__file_text__or__sql}
184: place_size=snprintf(local_place, MAX_STRING, "%s",
185: source_origin.file?source_origin.file:"unknown_file")+1;
186: #else
1.127.2.9 paf 187: strncpy(local_place, method_name->cstr(), MAX_STRING-1); place[MAX_STRING-1]=0;
1.101 paf 188: size_t place_size=strlen(local_place)+1;
189: #endif
1.127.2.12 paf 190: char *heap_place=pool.copy(local_place, place_size);
1.1 paf 191:
192: // process source code, append processed methods to 'self' class
193: // maybe-define new @main
1.116 paf 194: r.use_buf(*target_class,
1.127.2.15 paf 195: source->cstr(pool, String::UL_UNSPECIFIED, r.connection(StringPtr(0))),
1.127.2.10 paf 196: StringPtr(new String(heap_place, place_size, true /*tainted*/)),
1.113 paf 197: heap_place);
1.1 paf 198:
1.73 paf 199: // main_method
1.127.2.10 paf 200: main_method=target_class->get_method(main_method_name);
1.73 paf 201: }
202: // after restoring current-request-lang
203: // maybe-execute @main[]
204: if(main_method) {
1.119 paf 205: // temporarily set method_frame's self to target_self
206: Temp_method_frame_self tmfs(*r.get_method_frame(), target_self);
1.73 paf 207: // execute!
208: r.execute(*main_method->parser_code);
1.1 paf 209: }
210: }
211:
1.127.2.13 paf 212: static void _rem(Request& r, StringPtr /*method_name*/, MethodParams* params) {
213: params->as_junction(0, "body must be code");
1.1 paf 214: }
215:
1.127.2.13 paf 216: static void _while(Request& r, StringPtr method_name, MethodParams* params) {
1.1 paf 217: Pool& pool=r.pool();
218:
1.127.2.13 paf 219: ValuePtr vcondition=params->as_junction(0, "condition must be expression");
220: ValuePtr body=params->as_junction(1, "body must be code");
1.1 paf 221:
222: // while...
223: int endless_loop_count=0;
224: while(true) {
1.18 parser 225: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.78 paf 226: throw Exception("parser.runtime",
1.127.2.9 paf 227: method_name,
1.1 paf 228: "endless loop detected");
229:
1.86 paf 230: bool condition=r.process_to_value(vcondition,
1.83 paf 231: /*0/*no name* /,*/
1.127.2.10 paf 232: false/*don't intercept string*/)->as_bool();
1.1 paf 233: if(!condition) // ...condition is true
234: break;
235:
236: // write processed body
1.86 paf 237: r.write_pass_lang(r.process(body));
1.1 paf 238: }
239: }
240:
1.127.2.13 paf 241: static void _use(Request& r, StringPtr method_name, MethodParams* params) {
1.127.2.10 paf 242: Pool& pool=r.pool();
1.127.2.13 paf 243: ValuePtr vfile=params->as_no_junction(0, "file name must not be code");
1.127.2.10 paf 244: r.use_file(*r.main_class, vfile->as_string(&pool));
1.1 paf 245: }
246:
1.127.2.13 paf 247: static void _for(Request& r, StringPtr method_name, MethodParams* params) {
1.1 paf 248: Pool& pool=r.pool();
1.127.2.13 paf 249: StringPtr var_name=params->as_string(0, "var name must be string");
250: int from=params->as_int(1, "from must be int", r);
251: int to=params->as_int(2, "to must be int", r);
252: ValuePtr body_code=params->as_junction(3, "body must be code");
253: ValuePtr delim_maybe_code=params->count()>4?(*params)[4]:ValuePtr(0);
1.1 paf 254:
1.57 paf 255: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 256: throw Exception("parser.runtime",
1.127.2.9 paf 257: method_name,
1.57 paf 258: "endless loop detected");
259:
1.1 paf 260: bool need_delim=false;
1.127.2.10 paf 261: VIntPtr vint(new VInt(0));
1.117 paf 262: r.get_method_frame()->caller()->put_element(var_name, vint, false);
1.1 paf 263: for(int i=from; i<=to; i++) {
264: vint->set_int(i);
265:
1.108 paf 266: StringOrValue sv_processed=r.process(body_code);
1.127.2.10 paf 267: StringPtr s_processed=sv_processed.get_string();
1.108 paf 268: if(delim_maybe_code && s_processed && s_processed->size()) { // delimiter set and we have body
269: if(need_delim) // need delim & iteration produced string?
1.127.2.10 paf 270: r.write_pass_lang(r.process(delim_maybe_code));
1.1 paf 271: need_delim=true;
272: }
1.108 paf 273: r.write_pass_lang(sv_processed);
1.1 paf 274: }
275: }
276:
1.127.2.13 paf 277: static void _eval(Request& r, StringPtr method_name, MethodParams* params) {
278: ValuePtr expr=params->as_junction(0, "need expression");
1.1 paf 279: // evaluate expresion
1.127.2.10 paf 280: ValuePtr value_result=r.process_to_value(expr,
1.83 paf 281: /*0/*no name YET* /,*/
1.127.2.10 paf 282: true/*don't intercept string*/)->as_expr_result();
1.127.2.13 paf 283: if(params->count()>1) {
284: ValuePtr fmt=params->as_no_junction(1, "fmt must not be code");
1.1 paf 285:
286: Pool& pool=r.pool();
1.127.2.10 paf 287: String string;
288: string.APPEND_CONST(
289: format(pool, value_result->as_double(), fmt->as_string(&pool)->cstr()));
1.91 paf 290: r.write_no_lang(string);
291: } else
1.127.2.10 paf 292: r.write_no_lang(value_result);
1.1 paf 293: }
294:
1.127.2.13 paf 295: static void _connect(Request& r, StringPtr method_name, MethodParams* params) {
1.1 paf 296: Pool& pool=r.pool();
1.63 paf 297: #ifdef RESOURCES_DEBUG
298: struct timeval mt[2];
299: #endif
1.127.2.13 paf 300: ValuePtr url=params->as_no_junction(0, "url must not be code");
301: ValuePtr body_code=params->as_junction(1, "body must be code");
1.1 paf 302:
1.127.2.10 paf 303: Table* protocol2driver_and_client=0;
304: if(ValuePtr sql=r.main_class->get_element(StringPtr(new String(MAIN_SQL_NAME)), *r.main_class, false)) {
305: if(ValuePtr element=sql->get_element(StringPtr(new String(MAIN_SQL_DRIVERS_NAME)), *sql, false)) {
1.113 paf 306: protocol2driver_and_client=element->get_table();
307: }
308: }
1.11 paf 309:
1.63 paf 310: #ifdef RESOURCES_DEBUG
311: //measure:before
312: gettimeofday(&mt[0],NULL);
313: #endif
1.1 paf 314: // connect
1.127.2.10 paf 315: SQL_ConnectionPtr connection=SQL_driver_manager.get_connection(pool,
316: url->as_string(&pool), method_name, protocol2driver_and_client);
1.1 paf 317:
1.63 paf 318: #ifdef RESOURCES_DEBUG
319: //measure:after connect
320: gettimeofday(&mt[1],NULL);
321:
322: double t[2];
323: for(int i=0;i<2;i++)
324: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
325:
326: r.sql_connect_time+=t[1]-t[0];
327: #endif
1.67 paf 328: Temp_connection temp_connection(r, connection.get());
1.1 paf 329: // execute body
1.53 parser 330: try {
1.86 paf 331: r.write_assign_lang(r.process(body_code));
1.75 paf 332: } catch(...) { // process problem
1.67 paf 333: connection->mark_to_rollback();
1.127.2.6 paf 334: rethrow;
1.1 paf 335: }
336: }
337:
1.41 parser 338: #ifndef DOXYGEN
1.127.2.10 paf 339: class Switch_data: public PA_Object {
340: public:
341: Request& r;
342: ValuePtr searching;
343: ValuePtr found;
344: ValuePtr _default;
345: public:
346: Switch_data(Request& ar, ValuePtr asearching):
347: r(ar), searching(asearching) {}
1.28 parser 348: };
1.127.2.10 paf 349: DECLARE_OBJECT_PTR(Switch_data);
1.41 parser 350: #endif
1.127.2.13 paf 351: static void _switch(Request& r, StringPtr /*method_name*/, MethodParams* params) {
352: Switch_dataPtr data(new Switch_data(r, r.process_to_value(params->get(0))));
1.127.2.10 paf 353: Temp_hash_value<StringPtr, PA_ObjectPtr>
354: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 355:
1.127.2.13 paf 356: ValuePtr cases_code=params->as_junction(1, "switch cases must be code");
1.82 paf 357: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
358: // because of stacked WWrapper used there as wcontext
1.84 paf 359: r.process(cases_code, true/*intercept_string*/);
1.127.2.10 paf 360: if(ValuePtr selected_code=data->found? data->found: data->_default) {
1.83 paf 361: // setting code context, would execute in ^switch[...]{>>context<<}
1.105 paf 362: //selected_code->get_junction()->change_context(cases_code.get_junction());
1.127.2.10 paf 363: r.write_pass_lang(r.process(selected_code));
1.83 paf 364: }
1.28 parser 365: }
366:
1.127.2.13 paf 367: static void _case(Request& r, StringPtr method_name, MethodParams* params) {
1.38 parser 368: Pool& pool=r.pool();
369:
1.127.2.10 paf 370: Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name).get());
1.38 parser 371: if(!data)
1.78 paf 372: throw Exception("parser.runtime",
1.127.2.9 paf 373: method_name,
1.38 parser 374: "without switch");
1.28 parser 375:
1.127.2.13 paf 376: int count=params->count();
377: ValuePtr code=params->as_junction(--count, "case result must be code");
1.83 paf 378:
379: // killing context for safety, would execute in ^switch[...]{>>context<<}
380: // reason: context is stacked, and it would become invalid afterwards
1.105 paf 381: //code->get_junction()->change_context(0);
1.83 paf 382:
1.28 parser 383: for(int i=0; i<count; i++) {
1.127.2.13 paf 384: ValuePtr value=r.process_to_value(params->get(i));
1.28 parser 385:
1.127.2.10 paf 386: if(*value->as_string(&pool) == CASE_DEFAULT_VALUE) {
1.38 parser 387: data->_default=code;
1.28 parser 388: break;
389: }
390:
391: bool matches;
1.38 parser 392: if(data->searching->is_string())
1.127.2.10 paf 393: matches=*data->searching->as_string(&pool) == *value->as_string(&pool);
1.28 parser 394: else
1.127.2.10 paf 395: matches=data->searching->as_double() == value->as_double();
1.28 parser 396:
397: if(matches) {
1.82 paf 398: if(data->found)
399: throw Exception("parser.runtime",
1.127.2.9 paf 400: method_name,
1.82 paf 401: "duplicate found");
402:
1.38 parser 403: data->found=code;
1.28 parser 404: break;
405: }
406: }
407: }
408:
1.63 paf 409: // cache--
410:
411: // consts
412:
1.127.2.2 paf 413: const int DATA_STRING_SERIALIZED_VERSION=0x0003;
1.63 paf 414:
415: // helper types
416:
417: #ifndef DOXYGEN
418: struct Data_string_serialized_prolog {
419: int version;
1.79 paf 420: time_t expires;
1.63 paf 421: };
422: #endif
423:
1.127.2.10 paf 424: void cache_delete(StringPtr file_spec) {
1.68 paf 425: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 426: }
1.69 paf 427:
428: #ifndef DOXYGEN
1.127.2.10 paf 429: class Cache_data: public PA_Object {
430: public:
1.79 paf 431: time_t expires;
432: };
1.127.2.10 paf 433: DECLARE_OBJECT_PTR(Cache_data);
1.69 paf 434: struct Locked_process_and_cache_put_action_info {
435: Request *r;
1.79 paf 436: Cache_data *data;
1.127.2.10 paf 437: ValuePtr body_code; StringPtr evaluated_body;
1.69 paf 438: };
439: #endif
1.127.2.2 paf 440: /* @todo maybe network order worth spending some effort?
441: don't bothering myself with network byte order,
442: am not planning to be able to move resulting file across platforms
443: */
1.69 paf 444: static void locked_process_and_cache_put_action(int f, void *context) {
445: Locked_process_and_cache_put_action_info& info=
446: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.127.2.10 paf 447:
448: Pool& pool=info.r->pool();
1.69 paf 449:
450: // body->process
1.127.2.10 paf 451: info.evaluated_body=info.r->process_to_string(info.body_code);
1.69 paf 452:
1.79 paf 453: // expiration time not spoiled by ^cache(0) or something?
454: if(info.data->expires > time(0)) {
455: // string -serialize> buffer
1.127.2.10 paf 456: char *data; size_t data_size;
457: info.evaluated_body->serialize(pool,
1.79 paf 458: sizeof(Data_string_serialized_prolog),
459: data, data_size);
460: Data_string_serialized_prolog& prolog=
1.127.2.10 paf 461: *reinterpret_cast<Data_string_serialized_prolog *>(data);
1.79 paf 462: prolog.version=DATA_STRING_SERIALIZED_VERSION;
463: prolog.expires=info.data->expires;
464:
465: // buffer -write> file
466: write(f, data, data_size);
467: } else // expired!
468: info.data->expires=0; // flag it so that could be easily checked by caller
1.69 paf 469: }
1.127.2.10 paf 470: StringPtr locked_process_and_cache_put(Request& r,
471: ValuePtr body_code,
1.79 paf 472: Cache_data& data,
1.127.2.10 paf 473: StringPtr file_spec) {
474: Locked_process_and_cache_put_action_info info;
475: info.r=&r;
476: info.data=&data;
477: info.body_code=body_code;
1.69 paf 478:
1.127.2.10 paf 479: StringPtr result=file_write_action_under_lock(
1.69 paf 480: file_spec,
481: "cache_put", locked_process_and_cache_put_action, &info,
482: false/*as_text*/,
483: false/*do_append*/,
1.96 paf 484: false/*block*/,
1.127.2.10 paf 485: false/*fail on lock problem*/) ? info.evaluated_body: StringPtr(0);
1.100 paf 486: time_t now=time(0);
487: if(data.expires<=now)
1.79 paf 488: cache_delete(file_spec);
489: return result;
1.63 paf 490: }
1.127.2.10 paf 491: StringPtr cache_get(Pool& pool, Charset& charset, StringPtr file_spec, time_t now) {
492: File_read_result file=file_read(pool, charset, file_spec,
1.63 paf 493: false/*as_text*/,
1.127.2.10 paf 494: 0, //no params
495: false/*fail_on_read_problem*/);
1.127.2.11 paf 496: if(file.success && file.size/* ignore reads which are empty due to
1.72 paf 497: non-unary open+lockEX conflict with lockSH */) {
1.127.2.10 paf 498:
1.72 paf 499: Data_string_serialized_prolog& prolog=
1.127.2.10 paf 500: *reinterpret_cast<Data_string_serialized_prolog *>(file.data);
1.63 paf 501:
1.127.2.10 paf 502: StringPtr result(new String);
1.72 paf 503: if(
1.127.2.11 paf 504: file.size>=sizeof(Data_string_serialized_prolog)
1.72 paf 505: && prolog.version==DATA_STRING_SERIALIZED_VERSION
1.79 paf 506: && prolog.expires > now
1.72 paf 507: && result->deserialize(
1.127.2.11 paf 508: sizeof(Data_string_serialized_prolog), file.data, file.size, file_spec->cstr(pool)))
1.72 paf 509: return result;
510: }
1.63 paf 511:
1.127.2.19 paf 512: return StringPtr(0);
1.63 paf 513: }
1.127.2.13 paf 514: static time_t as_expires(Request& r, StringPtr method_name, MethodParams* params,
1.79 paf 515: int index, time_t now) {
516: time_t result;
1.127.2.13 paf 517: if(Value* vdate=(*params)[index]->as(VDATE_TYPE, false))
1.127.2.10 paf 518: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 519: else
1.127.2.13 paf 520: result=now+(time_t)params->as_double(index, "lifespan must be date or number", r);
1.79 paf 521:
522: return result;
523: }
1.127.2.13 paf 524: static StringPtr as_file_spec(Request& r, MethodParams* params, int index) {
525: return r.absolute(params->as_string(index, "filespec must be string"));
1.79 paf 526: }
1.127.2.13 paf 527: static void _cache(Request& r, StringPtr method_name, MethodParams* params) {
1.63 paf 528: Pool& pool=r.pool();
1.79 paf 529: time_t now=time(0);
530:
531: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.127.2.13 paf 532: if(params->count()==1) {
533: if((*params)[0]->is_string()) { // filename?
1.79 paf 534: cache_delete(as_file_spec(r, params, 0));
535: return;
536: }
537:
538: // secods|expires date
1.127.2.10 paf 539: Cache_data* data=static_cast<Cache_data*>(r.classes_conf.get(cache_data_name).get());
1.79 paf 540: if(!data)
541: throw Exception("parser.runtime",
1.127.2.9 paf 542: method_name,
1.79 paf 543: "expire-time reducing instruction without cache");
544:
545: time_t expires=as_expires(r, method_name, params, 0, now);
546: if(expires < data->expires)
547: data->expires=expires;
548:
549: return;
550: }
1.63 paf 551:
552: // file_spec, expires, body code
1.127.2.13 paf 553: StringPtr file_spec=r.absolute(params->as_string(0, "filespec must be string"));
1.65 paf 554:
1.127.2.10 paf 555: Cache_dataPtr data(new Cache_data);
556: Temp_hash_value<StringPtr, PA_ObjectPtr>
557: cache_data_setter(r.classes_conf, cache_data_name, data);
558: data->expires=as_expires(r, method_name, params, 1, now);
1.127.2.13 paf 559: ValuePtr body_code=params->as_junction(2, "body must be code");
1.63 paf 560:
1.127.2.10 paf 561: if(data->expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 562: // hence we don't hope to have unary create/lockEX
563: // we need some plan to live in a life like that, so...
564: // worst races plan:
565: // A B
566: // open
567: // |open
568: // lockSH
569: // |nonblocking-lockEX fails
570: // unlockSH
571: // close, cache_get returns 0
572: // open
573: // nonblocking-lockEX succeeds; process, write, close
574: // |retry1: open
575: // ...
576: // |lockSH succeeds; ...
577:
578: for(int retry=0; retry<2; retry++) {
1.127.2.10 paf 579: if(StringPtr cached_body=cache_get(pool, r.charsets.source(), file_spec, now)) { // have cached copy?
1.79 paf 580: // write it out
581: r.write_assign_lang(*cached_body);
582: // happy with it
583: return;
584: }
1.69 paf 585:
586: // non-blocked lock; process; cache it
1.127.2.10 paf 587: if(StringPtr processed_body=
588: locked_process_and_cache_put(r, body_code, *data, file_spec)) {
1.63 paf 589: // write it out
1.69 paf 590: r.write_assign_lang(*processed_body);
1.63 paf 591: // happy with it
592: return;
1.69 paf 593: } else { // somebody writing result right now
594: pa_sleep(0, 500000); // waiting half a second
595: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
1.63 paf 596: }
1.69 paf 597: }
1.78 paf 598: throw Exception(0,
1.127.2.10 paf 599: file_spec,
1.69 paf 600: "locking problem");
601: } else {
1.79 paf 602: // instructed not to cache; forget cached copy
1.68 paf 603: cache_delete(file_spec);
1.69 paf 604: // process
1.127.2.10 paf 605: StringPtr processed_body=r.process_to_string(body_code);
1.69 paf 606: // write it out
1.127.2.10 paf 607: r.write_assign_lang(*processed_body);
1.69 paf 608: // happy with it
609: return;
610: }
611: // never reached
1.63 paf 612: }
613:
1.74 paf 614: // also used in pa_request.C to pass param to @unhandled_exception
1.127.2.10 paf 615: VHashPtr exception2vhash(Pool& pool, const Exception& e) {
616: VHashPtr result(new VHash);
617: HashStringValue& hash=result->hash(Exception::undefined_source);
1.127.2.5 paf 618: if(const char* type=e.type(true))
1.127.2.10 paf 619: hash.put(exception_type_part_name, ValuePtr(new VString(StringPtr(new String(type)))));
620: if(StringPtr asource=e.problem_source()) {
621: StringPtr source(new String);
622: source->append(*asource, String::UL_TAINTED, true/*forced*/);
1.74 paf 623:
1.127.2.10 paf 624: hash.put(exception_source_part_name, ValuePtr(new VString(source)));
1.74 paf 625: #ifndef NO_STRING_ORIGIN
1.127.2.10 paf 626: const String_fragment::Origin& origin=source->origin();
627: hash.put(StringPtr(new String("file", 0, true)),
628: ValuePtr(new VString(StringPtr(new String(origin.file)))));
629: hash.put(StringPtr(new String("lineno")),
630: ValuePtr(new VInt(1+origin.line)));
1.74 paf 631: #endif
632: }
1.127.2.5 paf 633: if(const char* ecomment=e.comment(true)) {
1.127.2.10 paf 634: char *pcomment=pool.copy(ecomment);
635: hash.put(exception_comment_part_name,
636: ValuePtr(new VString(StringPtr(new String(pcomment, 0, true/*tainted*/)))));
1.74 paf 637: }
1.127.2.10 paf 638: hash.put(exception_handled_part_name,
639: ValuePtr(new VBool(false)));
1.74 paf 640:
641: return result;
642: }
643:
1.127.2.13 paf 644: static void _try_operator(Request& r, StringPtr method_name, MethodParams* params) {
1.74 paf 645: Pool& pool=r.pool();
646:
1.127.2.13 paf 647: ValuePtr body_code=params->as_junction(0, "body_code must be code");
648: ValuePtr catch_code=params->as_junction(1, "catch_code must be code");
1.74 paf 649:
1.86 paf 650: StringOrValue result;
1.123 paf 651: // taking snapshot of try-context
652: Request_context_saver try_context(r);
1.74 paf 653: try {
1.86 paf 654: result=r.process(body_code);
1.74 paf 655: } catch(const Exception& e) {
1.123 paf 656: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
657: try_context.restore(); // restoring try-context to perform catch-code
658:
1.127.2.6 paf 659: VHashPtr vhash=exception2vhash(pool, e);
1.74 paf 660:
1.127.2.10 paf 661: JunctionPtr junction=catch_code->get_junction();
662: Value* method_frame=junction->method_frame;
663: ValuePtr saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
664: junction->method_frame->put_element(exception_var_name, vhash, false);
1.86 paf 665: result=r.process(catch_code);
1.74 paf 666: bool handled=false;
1.127.2.10 paf 667: if(ValuePtr value=
668: vhash->hash(Exception::undefined_source).get(exception_handled_part_name))
1.74 paf 669: handled=value->as_bool();
1.127.2.10 paf 670: junction->method_frame->put_element(exception_var_name, saved_exception_var_value, false);
1.74 paf 671:
1.123 paf 672: if(!handled) {
673: throw_context.restore(); // restoring throw-context [exception were not handled]
1.74 paf 674: throw(e); // rethrow
1.123 paf 675: }
1.74 paf 676: }
1.123 paf 677: // write out result
1.86 paf 678: r.write_pass_lang(result);
1.74 paf 679: }
680:
1.127.2.13 paf 681: static void _throw_operator(Request& r, StringPtr method_name, MethodParams* params) {
1.74 paf 682: Pool& pool=r.pool();
683:
1.127.2.13 paf 684: if(params->count()==1) {
685: ValuePtr param0=(*params)[0];
1.127.2.10 paf 686: if(HashStringValue *hash=param0->get_hash(method_name)) {
1.127.2.5 paf 687: const char* type=0;
1.127.2.10 paf 688: if(ValuePtr value=hash->get(exception_type_part_name))
1.127.2.16 paf 689: type=value->as_string(&pool)->cstr(pool);
690: StringPtr source;
1.127.2.10 paf 691: if(ValuePtr value=hash->get(exception_source_part_name))
692: source=value->as_string(&pool);
1.127.2.16 paf 693: CharPtr comment;
1.127.2.10 paf 694: if(ValuePtr value=hash->get(exception_comment_part_name))
695: comment=value->as_string(&pool)->cstr();
1.74 paf 696:
1.78 paf 697: throw Exception(type,
1.127.2.9 paf 698: source?source:method_name,
1.127.2.19 paf 699: "%s", comment?comment.get():"");
1.74 paf 700: } else
1.78 paf 701: throw Exception("parser.runtime",
1.127.2.9 paf 702: method_name,
1.74 paf 703: "one-param version has hash param");
704: } else {
1.127.2.13 paf 705: const char* type=params->as_string(0, "type must be string")->cstr(pool);
706: StringPtr source=params->as_string(1, "source must be string");
707: CharPtr comment=params->count()>2? params->as_string(2, "comment must be string")->cstr()
1.127.2.10 paf 708: :CharPtr(0);
1.127.2.19 paf 709: throw Exception(type, source, "%s", comment?comment.get():"");
1.74 paf 710: }
711: }
1.127.2.20 paf 712:
713: #if defined(WIN32) && defined(_DEBUG)
714: # define PA_BPT
715: static void _bpt(Request& r, StringPtr method_name, MethodParams* params) {
716: _asm int 3;
717: }
718: #endif
719:
1.10 paf 720: // constructor
721:
1.127.2.10 paf 722: VClassMAIN::VClassMAIN(): VClass() {
723: set_name(StringPtr(new String(MAIN_CLASS_NAME)));
1.127.2.20 paf 724:
725: #ifdef PA_BPT
726: // ^bpt[]
727: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
728: #endif
1.121 paf 729:
1.1 paf 730: // ^if(condition){code-when-true}
731: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 732: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 733:
734: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 735: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 736:
737: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 738: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 739:
740: // ^process[code]
1.116 paf 741: add_native_method("process", Method::CT_ANY, _process, 1, 2);
1.1 paf 742:
743: // ^rem{code}
1.51 parser 744: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 745:
746: // ^while(condition){code}
1.10 paf 747: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 748:
749: // ^use[file]
1.10 paf 750: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 751:
1.54 paf 752: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 753: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 754:
755: // ^eval(expr)
756: // ^eval(expr)[format]
1.10 paf 757: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 758:
1.1 paf 759: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 760: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
761:
1.63 paf 762:
1.65 paf 763: // ^cache[file_spec] delete cache
1.63 paf 764: // ^cache[file_spec](time){code} time=0 no cache
1.65 paf 765: add_native_method("cache", Method::CT_ANY, _cache, 1, 3);
1.63 paf 766:
1.28 parser 767: // switch
768:
769: // ^switch[value]{cases}
770: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
771:
772: // ^case[value]{code}
1.51 parser 773: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 774:
775: // try-catch
776:
777: // ^try{code}{catch code}
778: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
779: // ^throw[$exception hash]
780: // ^throw[type;source;comment]
781: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
782:
1.10 paf 783: }
1.11 paf 784:
785: // constructor & configurator
1.1 paf 786:
1.127.2.4 paf 787: VStateless_classPtr VClassMAIN_create() {
1.127.2.1 paf 788:
1.127.2.4 paf 789: return VStateless_classPtr(new VClassMAIN);
1.1 paf 790: }
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