Annotation of parser3/src/classes/op.C, revision 1.127.2.22
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:
1.127.2.22! paf 8: static const char* IDENT_OP_C="$Date: 2003/03/08 16:43:45 $";
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();
1.127.2.22! paf 34: override ~VClassMAIN() {}
1.10 paf 35: };
36:
1.127.2.10 paf 37: // defines for statics
38:
39: #define SWITCH_DATA_NAME "SWITCH-DATA"
40: #define CACHE_DATA_NAME "CACHE-DATA"
41: #define EXCEPTION_VAR_NAME "exception"
42: #define EXCEPTION_TYPE_PART_NAME "type"
43: #define EXCEPTION_SOURCE_PART_NAME "source"
44: #define EXCEPTION_COMMENT_PART_NAME "comment"
45: #define EXCEPTION_HANDLED_PART_NAME "handled"
46:
47: // statics
48:
49: //^switch ^case
50: static StringPtr switch_data_name(new String(SWITCH_DATA_NAME));
51: //^cache
52: static StringPtr cache_data_name(new String(CACHE_DATA_NAME));
53:
54: static StringPtr exception_var_name(new String(EXCEPTION_VAR_NAME));
55: static StringPtr exception_type_part_name(new String(EXCEPTION_TYPE_PART_NAME));
56: static StringPtr exception_source_part_name(new String(EXCEPTION_SOURCE_PART_NAME));
57: static StringPtr exception_comment_part_name(new String(EXCEPTION_COMMENT_PART_NAME));
58: static StringPtr exception_handled_part_name(new String(EXCEPTION_HANDLED_PART_NAME));
59:
1.127.2.1 paf 60: // helpers
61:
1.127.2.10 paf 62: class Untaint_lang_name2enum: public Hash<StringPtr, int> {
63: public:
64: Untaint_lang_name2enum() {
65: #define ULN(name, LANG) \
66: put(StringPtr(new String(name)), (value_type)String::UL_##LANG);
67: ULN("as-is", AS_IS);
68: ULN("optimized-as-is", AS_IS|String::UL_OPTIMIZE_BIT);
69: ULN("file-spec", FILE_SPEC);
70: ULN("http-header", HTTP_HEADER);
71: ULN("mail-header", MAIL_HEADER);
72: ULN("uri", URI);
73: ULN("table", TABLE);
74: ULN("sql", SQL);
75: ULN("js", JS);
76: ULN("xml", XML);
77: ULN("optimized-xml", XML|String::UL_OPTIMIZE_BIT);
78: ULN("html", HTML);
79: ULN("optimized-html", HTML|String::UL_OPTIMIZE_BIT);
80: #undef ULN
81: }
82: } untaint_lang_name2enum;
1.127.2.1 paf 83:
1.10 paf 84: // methods
85:
1.127.2.13 paf 86: static void _if(Request& r, StringPtr /*method_name*/, MethodParams* params) {
87: ValuePtr condition_code=params->as_junction(0, "condition must be expression");
1.1 paf 88:
1.81 paf 89: bool condition=r.process_to_value(condition_code,
1.83 paf 90: /*0/*no name* /,*/
1.127.2.10 paf 91: false/*don't intercept string*/)->as_bool();
1.6 paf 92: if(condition)
1.127.2.13 paf 93: r.write_pass_lang(r.process(params->as_junction(1, "'then' parameter must be code")));
94: else if(params->count()>2)
95: r.write_pass_lang(r.process(params->as_junction(2, "'else' parameter must be code")));
1.1 paf 96: }
97:
1.127.2.13 paf 98: static void _untaint(Request& r, StringPtr method_name, MethodParams* params) {
1.1 paf 99: Pool& pool=r.pool();
100:
1.127.2.18 paf 101: String_UL lang;
1.127.2.13 paf 102: if(params->count()==1)
1.59 paf 103: lang=String::UL_AS_IS; // mark as simply 'tainted'. useful in html from sql
104: else {
1.127.2.13 paf 105: StringPtr lang_name=params->as_string(0, "lang must be string");
1.127.2.10 paf 106: lang=untaint_lang_name2enum.get(lang_name);
1.59 paf 107: if(!lang)
1.78 paf 108: throw Exception(0,
1.127.2.10 paf 109: lang_name,
1.59 paf 110: "invalid taint language");
111: }
1.1 paf 112:
113: {
1.127.2.13 paf 114: ValuePtr vbody=params->as_junction(params->count()-1, "body must be code");
1.1 paf 115:
116: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.86 paf 117: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 118: }
119: }
120:
1.127.2.13 paf 121: static void _taint(Request& r, StringPtr /*method_name*/, MethodParams* params) {
1.1 paf 122: Pool& pool=r.pool();
123:
1.127.2.18 paf 124: String_UL lang;
1.127.2.13 paf 125: if(params->count()==1)
1.1 paf 126: lang=String::UL_TAINTED; // mark as simply 'tainted'. useful in table:set
127: else {
1.127.2.13 paf 128: StringPtr lang_name=params->as_string(0, "lang must be string");
1.127.2.10 paf 129: lang=untaint_lang_name2enum.get(lang_name);
1.1 paf 130: if(!lang)
1.78 paf 131: throw Exception(0,
1.127.2.10 paf 132: lang_name,
1.3 paf 133: "invalid taint language");
1.1 paf 134: }
135:
136: {
1.127.2.13 paf 137: ValuePtr vbody=params->as_no_junction(params->count()-1, "body must not be code");
1.1 paf 138:
1.127.2.10 paf 139: String result;
1.1 paf 140: result.append(
1.127.2.10 paf 141: *vbody->as_string(&pool), // process marking tainted with that lang
1.1 paf 142: lang, true); // force result language to specified
143: r.write_pass_lang(result);
144: }
145: }
146:
1.127.2.13 paf 147: static void _process(Request& r, StringPtr method_name, MethodParams* params) {
1.97 paf 148: Pool& pool=r.pool();
1.127.2.15 paf 149: StringPtr source; // must be declared here to prevent premature destruction
1.127.2.14 paf 150: MethodPtr main_method;
1.127.2.13 paf 151: ValuePtr target_self=params->count()>1?
152: params->as_no_junction(0, "target must not be code")
1.127.2.10 paf 153: :ValuePtr(&r.get_method_frame()->caller()->self());
1.1 paf 154: {
1.127.2.13 paf 155: ValuePtr vjunction=params->as_junction(params->count()-1, "body must be code");
1.114 paf 156:
1.127.2.10 paf 157: VStateless_class *target_class=target_self->get_last_derived_class();
1.116 paf 158: if(!target_class)
159: throw Exception("parser.runtime",
1.127.2.9 paf 160: method_name,
1.116 paf 161: "no target class");
162:
1.114 paf 163: // evaluate source to process
1.127.2.15 paf 164: source=r.process_to_string(vjunction);
1.114 paf 165:
1.73 paf 166: // temporary remove language change
167: Temp_lang temp_lang(r, String::UL_PASS_APPENDED);
1.1 paf 168: // temporary zero @main so to maybe-replace it in processed code
1.127.2.10 paf 169: Temp_method temp_method_main(*target_class, main_method_name, MethodPtr(0));
1.1 paf 170: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
1.127.2.10 paf 171: Temp_method temp_method_auto(*target_class, auto_method_name, MethodPtr(0));
1.1 paf 172:
1.101 paf 173: // calculate pseudo file name of processed chars
174: // would be something like "/some/file(4) process"
175: char local_place[MAX_STRING];
176: #ifndef NO_STRING_ORIGIN
1.127.2.10 paf 177: const String_fragment::Origin& source_origin=source->origin();
178: const String_fragment::Origin& method_origin=method_name->origin();
1.101 paf 179: size_t place_size;
180: if(source_origin.file==method_origin.file)
181: place_size=snprintf(local_place, MAX_STRING, "%s(%d) %s", // same file
182: source_origin.file?source_origin.file:"unknown_file", 1+source_origin.line,
1.127.2.14 paf 183: method_name->cstr().get())+1;
1.101 paf 184: else // different files ^process{external__file_text__or__sql}
185: place_size=snprintf(local_place, MAX_STRING, "%s",
186: source_origin.file?source_origin.file:"unknown_file")+1;
187: #else
1.127.2.9 paf 188: strncpy(local_place, method_name->cstr(), MAX_STRING-1); place[MAX_STRING-1]=0;
1.101 paf 189: size_t place_size=strlen(local_place)+1;
190: #endif
1.127.2.12 paf 191: char *heap_place=pool.copy(local_place, place_size);
1.1 paf 192:
193: // process source code, append processed methods to 'self' class
194: // maybe-define new @main
1.116 paf 195: r.use_buf(*target_class,
1.127.2.15 paf 196: source->cstr(pool, String::UL_UNSPECIFIED, r.connection(StringPtr(0))),
1.127.2.10 paf 197: StringPtr(new String(heap_place, place_size, true /*tainted*/)),
1.113 paf 198: heap_place);
1.1 paf 199:
1.73 paf 200: // main_method
1.127.2.10 paf 201: main_method=target_class->get_method(main_method_name);
1.73 paf 202: }
203: // after restoring current-request-lang
204: // maybe-execute @main[]
205: if(main_method) {
1.119 paf 206: // temporarily set method_frame's self to target_self
207: Temp_method_frame_self tmfs(*r.get_method_frame(), target_self);
1.73 paf 208: // execute!
209: r.execute(*main_method->parser_code);
1.1 paf 210: }
211: }
212:
1.127.2.13 paf 213: static void _rem(Request& r, StringPtr /*method_name*/, MethodParams* params) {
214: params->as_junction(0, "body must be code");
1.1 paf 215: }
216:
1.127.2.13 paf 217: static void _while(Request& r, StringPtr method_name, MethodParams* params) {
1.1 paf 218: Pool& pool=r.pool();
219:
1.127.2.13 paf 220: ValuePtr vcondition=params->as_junction(0, "condition must be expression");
221: ValuePtr body=params->as_junction(1, "body must be code");
1.1 paf 222:
223: // while...
224: int endless_loop_count=0;
225: while(true) {
1.18 parser 226: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.78 paf 227: throw Exception("parser.runtime",
1.127.2.9 paf 228: method_name,
1.1 paf 229: "endless loop detected");
230:
1.86 paf 231: bool condition=r.process_to_value(vcondition,
1.83 paf 232: /*0/*no name* /,*/
1.127.2.10 paf 233: false/*don't intercept string*/)->as_bool();
1.1 paf 234: if(!condition) // ...condition is true
235: break;
236:
237: // write processed body
1.86 paf 238: r.write_pass_lang(r.process(body));
1.1 paf 239: }
240: }
241:
1.127.2.13 paf 242: static void _use(Request& r, StringPtr method_name, MethodParams* params) {
1.127.2.10 paf 243: Pool& pool=r.pool();
1.127.2.13 paf 244: ValuePtr vfile=params->as_no_junction(0, "file name must not be code");
1.127.2.10 paf 245: r.use_file(*r.main_class, vfile->as_string(&pool));
1.1 paf 246: }
247:
1.127.2.13 paf 248: static void _for(Request& r, StringPtr method_name, MethodParams* params) {
1.1 paf 249: Pool& pool=r.pool();
1.127.2.13 paf 250: StringPtr var_name=params->as_string(0, "var name must be string");
251: int from=params->as_int(1, "from must be int", r);
252: int to=params->as_int(2, "to must be int", r);
253: ValuePtr body_code=params->as_junction(3, "body must be code");
254: ValuePtr delim_maybe_code=params->count()>4?(*params)[4]:ValuePtr(0);
1.1 paf 255:
1.57 paf 256: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 257: throw Exception("parser.runtime",
1.127.2.9 paf 258: method_name,
1.57 paf 259: "endless loop detected");
260:
1.1 paf 261: bool need_delim=false;
1.127.2.10 paf 262: VIntPtr vint(new VInt(0));
1.117 paf 263: r.get_method_frame()->caller()->put_element(var_name, vint, false);
1.1 paf 264: for(int i=from; i<=to; i++) {
265: vint->set_int(i);
266:
1.108 paf 267: StringOrValue sv_processed=r.process(body_code);
1.127.2.10 paf 268: StringPtr s_processed=sv_processed.get_string();
1.108 paf 269: if(delim_maybe_code && s_processed && s_processed->size()) { // delimiter set and we have body
270: if(need_delim) // need delim & iteration produced string?
1.127.2.10 paf 271: r.write_pass_lang(r.process(delim_maybe_code));
1.1 paf 272: need_delim=true;
273: }
1.108 paf 274: r.write_pass_lang(sv_processed);
1.1 paf 275: }
276: }
277:
1.127.2.13 paf 278: static void _eval(Request& r, StringPtr method_name, MethodParams* params) {
279: ValuePtr expr=params->as_junction(0, "need expression");
1.1 paf 280: // evaluate expresion
1.127.2.10 paf 281: ValuePtr value_result=r.process_to_value(expr,
1.83 paf 282: /*0/*no name YET* /,*/
1.127.2.10 paf 283: true/*don't intercept string*/)->as_expr_result();
1.127.2.13 paf 284: if(params->count()>1) {
285: ValuePtr fmt=params->as_no_junction(1, "fmt must not be code");
1.1 paf 286:
287: Pool& pool=r.pool();
1.127.2.10 paf 288: String string;
289: string.APPEND_CONST(
290: format(pool, value_result->as_double(), fmt->as_string(&pool)->cstr()));
1.91 paf 291: r.write_no_lang(string);
292: } else
1.127.2.10 paf 293: r.write_no_lang(value_result);
1.1 paf 294: }
295:
1.127.2.13 paf 296: static void _connect(Request& r, StringPtr method_name, MethodParams* params) {
1.1 paf 297: Pool& pool=r.pool();
1.63 paf 298: #ifdef RESOURCES_DEBUG
299: struct timeval mt[2];
300: #endif
1.127.2.13 paf 301: ValuePtr url=params->as_no_junction(0, "url must not be code");
302: ValuePtr body_code=params->as_junction(1, "body must be code");
1.1 paf 303:
1.127.2.10 paf 304: Table* protocol2driver_and_client=0;
305: if(ValuePtr sql=r.main_class->get_element(StringPtr(new String(MAIN_SQL_NAME)), *r.main_class, false)) {
306: if(ValuePtr element=sql->get_element(StringPtr(new String(MAIN_SQL_DRIVERS_NAME)), *sql, false)) {
1.113 paf 307: protocol2driver_and_client=element->get_table();
308: }
309: }
1.11 paf 310:
1.63 paf 311: #ifdef RESOURCES_DEBUG
312: //measure:before
313: gettimeofday(&mt[0],NULL);
314: #endif
1.1 paf 315: // connect
1.127.2.10 paf 316: SQL_ConnectionPtr connection=SQL_driver_manager.get_connection(pool,
317: url->as_string(&pool), method_name, protocol2driver_and_client);
1.1 paf 318:
1.63 paf 319: #ifdef RESOURCES_DEBUG
320: //measure:after connect
321: gettimeofday(&mt[1],NULL);
322:
323: double t[2];
324: for(int i=0;i<2;i++)
325: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
326:
327: r.sql_connect_time+=t[1]-t[0];
328: #endif
1.67 paf 329: Temp_connection temp_connection(r, connection.get());
1.1 paf 330: // execute body
1.53 parser 331: try {
1.86 paf 332: r.write_assign_lang(r.process(body_code));
1.75 paf 333: } catch(...) { // process problem
1.67 paf 334: connection->mark_to_rollback();
1.127.2.6 paf 335: rethrow;
1.1 paf 336: }
337: }
338:
1.41 parser 339: #ifndef DOXYGEN
1.127.2.10 paf 340: class Switch_data: public PA_Object {
341: public:
342: Request& r;
343: ValuePtr searching;
344: ValuePtr found;
345: ValuePtr _default;
346: public:
347: Switch_data(Request& ar, ValuePtr asearching):
348: r(ar), searching(asearching) {}
1.28 parser 349: };
1.127.2.10 paf 350: DECLARE_OBJECT_PTR(Switch_data);
1.41 parser 351: #endif
1.127.2.13 paf 352: static void _switch(Request& r, StringPtr /*method_name*/, MethodParams* params) {
353: Switch_dataPtr data(new Switch_data(r, r.process_to_value(params->get(0))));
1.127.2.10 paf 354: Temp_hash_value<StringPtr, PA_ObjectPtr>
355: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 356:
1.127.2.13 paf 357: ValuePtr cases_code=params->as_junction(1, "switch cases must be code");
1.82 paf 358: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
359: // because of stacked WWrapper used there as wcontext
1.84 paf 360: r.process(cases_code, true/*intercept_string*/);
1.127.2.10 paf 361: if(ValuePtr selected_code=data->found? data->found: data->_default) {
1.83 paf 362: // setting code context, would execute in ^switch[...]{>>context<<}
1.105 paf 363: //selected_code->get_junction()->change_context(cases_code.get_junction());
1.127.2.10 paf 364: r.write_pass_lang(r.process(selected_code));
1.83 paf 365: }
1.28 parser 366: }
367:
1.127.2.13 paf 368: static void _case(Request& r, StringPtr method_name, MethodParams* params) {
1.38 parser 369: Pool& pool=r.pool();
370:
1.127.2.10 paf 371: Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name).get());
1.38 parser 372: if(!data)
1.78 paf 373: throw Exception("parser.runtime",
1.127.2.9 paf 374: method_name,
1.38 parser 375: "without switch");
1.28 parser 376:
1.127.2.13 paf 377: int count=params->count();
378: ValuePtr code=params->as_junction(--count, "case result must be code");
1.83 paf 379:
380: // killing context for safety, would execute in ^switch[...]{>>context<<}
381: // reason: context is stacked, and it would become invalid afterwards
1.105 paf 382: //code->get_junction()->change_context(0);
1.83 paf 383:
1.28 parser 384: for(int i=0; i<count; i++) {
1.127.2.13 paf 385: ValuePtr value=r.process_to_value(params->get(i));
1.28 parser 386:
1.127.2.10 paf 387: if(*value->as_string(&pool) == CASE_DEFAULT_VALUE) {
1.38 parser 388: data->_default=code;
1.28 parser 389: break;
390: }
391:
392: bool matches;
1.38 parser 393: if(data->searching->is_string())
1.127.2.10 paf 394: matches=*data->searching->as_string(&pool) == *value->as_string(&pool);
1.28 parser 395: else
1.127.2.10 paf 396: matches=data->searching->as_double() == value->as_double();
1.28 parser 397:
398: if(matches) {
1.82 paf 399: if(data->found)
400: throw Exception("parser.runtime",
1.127.2.9 paf 401: method_name,
1.82 paf 402: "duplicate found");
403:
1.38 parser 404: data->found=code;
1.28 parser 405: break;
406: }
407: }
408: }
409:
1.63 paf 410: // cache--
411:
412: // consts
413:
1.127.2.2 paf 414: const int DATA_STRING_SERIALIZED_VERSION=0x0003;
1.63 paf 415:
416: // helper types
417:
418: #ifndef DOXYGEN
419: struct Data_string_serialized_prolog {
420: int version;
1.79 paf 421: time_t expires;
1.63 paf 422: };
423: #endif
424:
1.127.2.10 paf 425: void cache_delete(StringPtr file_spec) {
1.68 paf 426: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 427: }
1.69 paf 428:
429: #ifndef DOXYGEN
1.127.2.10 paf 430: class Cache_data: public PA_Object {
431: public:
1.79 paf 432: time_t expires;
433: };
1.127.2.10 paf 434: DECLARE_OBJECT_PTR(Cache_data);
1.69 paf 435: struct Locked_process_and_cache_put_action_info {
436: Request *r;
1.79 paf 437: Cache_data *data;
1.127.2.10 paf 438: ValuePtr body_code; StringPtr evaluated_body;
1.69 paf 439: };
440: #endif
1.127.2.2 paf 441: /* @todo maybe network order worth spending some effort?
442: don't bothering myself with network byte order,
443: am not planning to be able to move resulting file across platforms
444: */
1.69 paf 445: static void locked_process_and_cache_put_action(int f, void *context) {
446: Locked_process_and_cache_put_action_info& info=
447: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.127.2.10 paf 448:
449: Pool& pool=info.r->pool();
1.69 paf 450:
451: // body->process
1.127.2.10 paf 452: info.evaluated_body=info.r->process_to_string(info.body_code);
1.69 paf 453:
1.79 paf 454: // expiration time not spoiled by ^cache(0) or something?
455: if(info.data->expires > time(0)) {
456: // string -serialize> buffer
1.127.2.10 paf 457: char *data; size_t data_size;
458: info.evaluated_body->serialize(pool,
1.79 paf 459: sizeof(Data_string_serialized_prolog),
460: data, data_size);
461: Data_string_serialized_prolog& prolog=
1.127.2.10 paf 462: *reinterpret_cast<Data_string_serialized_prolog *>(data);
1.79 paf 463: prolog.version=DATA_STRING_SERIALIZED_VERSION;
464: prolog.expires=info.data->expires;
465:
466: // buffer -write> file
467: write(f, data, data_size);
468: } else // expired!
469: info.data->expires=0; // flag it so that could be easily checked by caller
1.69 paf 470: }
1.127.2.10 paf 471: StringPtr locked_process_and_cache_put(Request& r,
472: ValuePtr body_code,
1.79 paf 473: Cache_data& data,
1.127.2.10 paf 474: StringPtr file_spec) {
475: Locked_process_and_cache_put_action_info info;
476: info.r=&r;
477: info.data=&data;
478: info.body_code=body_code;
1.69 paf 479:
1.127.2.10 paf 480: StringPtr result=file_write_action_under_lock(
1.69 paf 481: file_spec,
482: "cache_put", locked_process_and_cache_put_action, &info,
483: false/*as_text*/,
484: false/*do_append*/,
1.96 paf 485: false/*block*/,
1.127.2.10 paf 486: false/*fail on lock problem*/) ? info.evaluated_body: StringPtr(0);
1.100 paf 487: time_t now=time(0);
488: if(data.expires<=now)
1.79 paf 489: cache_delete(file_spec);
490: return result;
1.63 paf 491: }
1.127.2.10 paf 492: StringPtr cache_get(Pool& pool, Charset& charset, StringPtr file_spec, time_t now) {
493: File_read_result file=file_read(pool, charset, file_spec,
1.63 paf 494: false/*as_text*/,
1.127.2.10 paf 495: 0, //no params
496: false/*fail_on_read_problem*/);
1.127.2.11 paf 497: if(file.success && file.size/* ignore reads which are empty due to
1.72 paf 498: non-unary open+lockEX conflict with lockSH */) {
1.127.2.10 paf 499:
1.72 paf 500: Data_string_serialized_prolog& prolog=
1.127.2.10 paf 501: *reinterpret_cast<Data_string_serialized_prolog *>(file.data);
1.63 paf 502:
1.127.2.10 paf 503: StringPtr result(new String);
1.72 paf 504: if(
1.127.2.11 paf 505: file.size>=sizeof(Data_string_serialized_prolog)
1.72 paf 506: && prolog.version==DATA_STRING_SERIALIZED_VERSION
1.79 paf 507: && prolog.expires > now
1.72 paf 508: && result->deserialize(
1.127.2.11 paf 509: sizeof(Data_string_serialized_prolog), file.data, file.size, file_spec->cstr(pool)))
1.72 paf 510: return result;
511: }
1.63 paf 512:
1.127.2.19 paf 513: return StringPtr(0);
1.63 paf 514: }
1.127.2.13 paf 515: static time_t as_expires(Request& r, StringPtr method_name, MethodParams* params,
1.79 paf 516: int index, time_t now) {
517: time_t result;
1.127.2.13 paf 518: if(Value* vdate=(*params)[index]->as(VDATE_TYPE, false))
1.127.2.10 paf 519: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 520: else
1.127.2.13 paf 521: result=now+(time_t)params->as_double(index, "lifespan must be date or number", r);
1.79 paf 522:
523: return result;
524: }
1.127.2.13 paf 525: static StringPtr as_file_spec(Request& r, MethodParams* params, int index) {
526: return r.absolute(params->as_string(index, "filespec must be string"));
1.79 paf 527: }
1.127.2.13 paf 528: static void _cache(Request& r, StringPtr method_name, MethodParams* params) {
1.63 paf 529: Pool& pool=r.pool();
1.79 paf 530: time_t now=time(0);
531:
532: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.127.2.13 paf 533: if(params->count()==1) {
534: if((*params)[0]->is_string()) { // filename?
1.79 paf 535: cache_delete(as_file_spec(r, params, 0));
536: return;
537: }
538:
539: // secods|expires date
1.127.2.10 paf 540: Cache_data* data=static_cast<Cache_data*>(r.classes_conf.get(cache_data_name).get());
1.79 paf 541: if(!data)
542: throw Exception("parser.runtime",
1.127.2.9 paf 543: method_name,
1.79 paf 544: "expire-time reducing instruction without cache");
545:
546: time_t expires=as_expires(r, method_name, params, 0, now);
547: if(expires < data->expires)
548: data->expires=expires;
549:
550: return;
551: }
1.63 paf 552:
553: // file_spec, expires, body code
1.127.2.13 paf 554: StringPtr file_spec=r.absolute(params->as_string(0, "filespec must be string"));
1.65 paf 555:
1.127.2.10 paf 556: Cache_dataPtr data(new Cache_data);
557: Temp_hash_value<StringPtr, PA_ObjectPtr>
558: cache_data_setter(r.classes_conf, cache_data_name, data);
559: data->expires=as_expires(r, method_name, params, 1, now);
1.127.2.13 paf 560: ValuePtr body_code=params->as_junction(2, "body must be code");
1.63 paf 561:
1.127.2.10 paf 562: if(data->expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 563: // hence we don't hope to have unary create/lockEX
564: // we need some plan to live in a life like that, so...
565: // worst races plan:
566: // A B
567: // open
568: // |open
569: // lockSH
570: // |nonblocking-lockEX fails
571: // unlockSH
572: // close, cache_get returns 0
573: // open
574: // nonblocking-lockEX succeeds; process, write, close
575: // |retry1: open
576: // ...
577: // |lockSH succeeds; ...
578:
579: for(int retry=0; retry<2; retry++) {
1.127.2.10 paf 580: if(StringPtr cached_body=cache_get(pool, r.charsets.source(), file_spec, now)) { // have cached copy?
1.79 paf 581: // write it out
582: r.write_assign_lang(*cached_body);
583: // happy with it
584: return;
585: }
1.69 paf 586:
587: // non-blocked lock; process; cache it
1.127.2.10 paf 588: if(StringPtr processed_body=
589: locked_process_and_cache_put(r, body_code, *data, file_spec)) {
1.63 paf 590: // write it out
1.69 paf 591: r.write_assign_lang(*processed_body);
1.63 paf 592: // happy with it
593: return;
1.69 paf 594: } else { // somebody writing result right now
595: pa_sleep(0, 500000); // waiting half a second
596: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
1.63 paf 597: }
1.69 paf 598: }
1.78 paf 599: throw Exception(0,
1.127.2.10 paf 600: file_spec,
1.69 paf 601: "locking problem");
602: } else {
1.79 paf 603: // instructed not to cache; forget cached copy
1.68 paf 604: cache_delete(file_spec);
1.69 paf 605: // process
1.127.2.10 paf 606: StringPtr processed_body=r.process_to_string(body_code);
1.69 paf 607: // write it out
1.127.2.10 paf 608: r.write_assign_lang(*processed_body);
1.69 paf 609: // happy with it
610: return;
611: }
612: // never reached
1.63 paf 613: }
614:
1.74 paf 615: // also used in pa_request.C to pass param to @unhandled_exception
1.127.2.10 paf 616: VHashPtr exception2vhash(Pool& pool, const Exception& e) {
617: VHashPtr result(new VHash);
618: HashStringValue& hash=result->hash(Exception::undefined_source);
1.127.2.5 paf 619: if(const char* type=e.type(true))
1.127.2.10 paf 620: hash.put(exception_type_part_name, ValuePtr(new VString(StringPtr(new String(type)))));
621: if(StringPtr asource=e.problem_source()) {
622: StringPtr source(new String);
623: source->append(*asource, String::UL_TAINTED, true/*forced*/);
1.74 paf 624:
1.127.2.10 paf 625: hash.put(exception_source_part_name, ValuePtr(new VString(source)));
1.74 paf 626: #ifndef NO_STRING_ORIGIN
1.127.2.10 paf 627: const String_fragment::Origin& origin=source->origin();
628: hash.put(StringPtr(new String("file", 0, true)),
629: ValuePtr(new VString(StringPtr(new String(origin.file)))));
630: hash.put(StringPtr(new String("lineno")),
631: ValuePtr(new VInt(1+origin.line)));
1.74 paf 632: #endif
633: }
1.127.2.5 paf 634: if(const char* ecomment=e.comment(true)) {
1.127.2.10 paf 635: char *pcomment=pool.copy(ecomment);
636: hash.put(exception_comment_part_name,
637: ValuePtr(new VString(StringPtr(new String(pcomment, 0, true/*tainted*/)))));
1.74 paf 638: }
1.127.2.10 paf 639: hash.put(exception_handled_part_name,
640: ValuePtr(new VBool(false)));
1.74 paf 641:
642: return result;
643: }
644:
1.127.2.13 paf 645: static void _try_operator(Request& r, StringPtr method_name, MethodParams* params) {
1.74 paf 646: Pool& pool=r.pool();
647:
1.127.2.13 paf 648: ValuePtr body_code=params->as_junction(0, "body_code must be code");
649: ValuePtr catch_code=params->as_junction(1, "catch_code must be code");
1.74 paf 650:
1.86 paf 651: StringOrValue result;
1.123 paf 652: // taking snapshot of try-context
653: Request_context_saver try_context(r);
1.74 paf 654: try {
1.86 paf 655: result=r.process(body_code);
1.74 paf 656: } catch(const Exception& e) {
1.123 paf 657: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
658: try_context.restore(); // restoring try-context to perform catch-code
659:
1.127.2.6 paf 660: VHashPtr vhash=exception2vhash(pool, e);
1.74 paf 661:
1.127.2.10 paf 662: JunctionPtr junction=catch_code->get_junction();
663: Value* method_frame=junction->method_frame;
664: ValuePtr saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
665: junction->method_frame->put_element(exception_var_name, vhash, false);
1.86 paf 666: result=r.process(catch_code);
1.74 paf 667: bool handled=false;
1.127.2.10 paf 668: if(ValuePtr value=
669: vhash->hash(Exception::undefined_source).get(exception_handled_part_name))
1.74 paf 670: handled=value->as_bool();
1.127.2.10 paf 671: junction->method_frame->put_element(exception_var_name, saved_exception_var_value, false);
1.74 paf 672:
1.123 paf 673: if(!handled) {
674: throw_context.restore(); // restoring throw-context [exception were not handled]
1.74 paf 675: throw(e); // rethrow
1.123 paf 676: }
1.74 paf 677: }
1.123 paf 678: // write out result
1.86 paf 679: r.write_pass_lang(result);
1.74 paf 680: }
681:
1.127.2.13 paf 682: static void _throw_operator(Request& r, StringPtr method_name, MethodParams* params) {
1.74 paf 683: Pool& pool=r.pool();
684:
1.127.2.13 paf 685: if(params->count()==1) {
686: ValuePtr param0=(*params)[0];
1.127.2.10 paf 687: if(HashStringValue *hash=param0->get_hash(method_name)) {
1.127.2.5 paf 688: const char* type=0;
1.127.2.10 paf 689: if(ValuePtr value=hash->get(exception_type_part_name))
1.127.2.16 paf 690: type=value->as_string(&pool)->cstr(pool);
691: StringPtr source;
1.127.2.10 paf 692: if(ValuePtr value=hash->get(exception_source_part_name))
693: source=value->as_string(&pool);
1.127.2.16 paf 694: CharPtr comment;
1.127.2.10 paf 695: if(ValuePtr value=hash->get(exception_comment_part_name))
696: comment=value->as_string(&pool)->cstr();
1.74 paf 697:
1.78 paf 698: throw Exception(type,
1.127.2.9 paf 699: source?source:method_name,
1.127.2.19 paf 700: "%s", comment?comment.get():"");
1.74 paf 701: } else
1.78 paf 702: throw Exception("parser.runtime",
1.127.2.9 paf 703: method_name,
1.74 paf 704: "one-param version has hash param");
705: } else {
1.127.2.13 paf 706: const char* type=params->as_string(0, "type must be string")->cstr(pool);
707: StringPtr source=params->as_string(1, "source must be string");
708: CharPtr comment=params->count()>2? params->as_string(2, "comment must be string")->cstr()
1.127.2.10 paf 709: :CharPtr(0);
1.127.2.19 paf 710: throw Exception(type, source, "%s", comment?comment.get():"");
1.74 paf 711: }
712: }
1.127.2.20 paf 713:
714: #if defined(WIN32) && defined(_DEBUG)
715: # define PA_BPT
716: static void _bpt(Request& r, StringPtr method_name, MethodParams* params) {
717: _asm int 3;
718: }
719: #endif
720:
1.10 paf 721: // constructor
722:
1.127.2.10 paf 723: VClassMAIN::VClassMAIN(): VClass() {
724: set_name(StringPtr(new String(MAIN_CLASS_NAME)));
1.127.2.20 paf 725:
726: #ifdef PA_BPT
727: // ^bpt[]
728: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
729: #endif
1.121 paf 730:
1.1 paf 731: // ^if(condition){code-when-true}
732: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 733: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 734:
735: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 736: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 737:
738: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 739: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 740:
741: // ^process[code]
1.116 paf 742: add_native_method("process", Method::CT_ANY, _process, 1, 2);
1.1 paf 743:
744: // ^rem{code}
1.51 parser 745: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 746:
747: // ^while(condition){code}
1.10 paf 748: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 749:
750: // ^use[file]
1.10 paf 751: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 752:
1.54 paf 753: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 754: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 755:
756: // ^eval(expr)
757: // ^eval(expr)[format]
1.10 paf 758: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 759:
1.1 paf 760: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 761: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
762:
1.63 paf 763:
1.65 paf 764: // ^cache[file_spec] delete cache
1.63 paf 765: // ^cache[file_spec](time){code} time=0 no cache
1.65 paf 766: add_native_method("cache", Method::CT_ANY, _cache, 1, 3);
1.63 paf 767:
1.28 parser 768: // switch
769:
770: // ^switch[value]{cases}
771: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
772:
773: // ^case[value]{code}
1.51 parser 774: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 775:
776: // try-catch
777:
778: // ^try{code}{catch code}
779: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
780: // ^throw[$exception hash]
781: // ^throw[type;source;comment]
782: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
783:
1.10 paf 784: }
1.11 paf 785:
786: // constructor & configurator
1.1 paf 787:
1.127.2.4 paf 788: VStateless_classPtr VClassMAIN_create() {
1.127.2.1 paf 789:
1.127.2.4 paf 790: return VStateless_classPtr(new VClassMAIN);
1.1 paf 791: }
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