Annotation of parser3/src/classes/op.C, revision 1.127.2.22.2.28
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:
1.127.2.22.2. 8(paf 8:3): static const char* IDENT_OP_C="$Date: 2003/04/03 10:48:24 $";
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:
42: // statics
43:
44: //^switch ^case
1.127.2.22.2. 3(paf 45:3): static const String switch_data_name(SWITCH_DATA_NAME);
1.127.2.10 paf 46: //^cache
1.127.2.22.2. 3(paf 47:3): static const String cache_data_name(CACHE_DATA_NAME);
1.127.2.10 paf 48:
1.127.2.22.2. 3(paf 49:3): static const String exception_var_name(EXCEPTION_VAR_NAME);
1.127.2.10 paf 50:
1.127.2.1 paf 51: // helpers
52:
1.127.2.22.2. 6(paf 53:3): class Untaint_lang_name2enum: public Hash<const StringBody, String::Language> {
1.127.2.10 paf 54: public:
55: Untaint_lang_name2enum() {
56: #define ULN(name, LANG) \
1.127.2.22.2. 4(paf 57:3): put(StringBody(name), (value_type)(String::L_##LANG));
1.127.2.10 paf 58: ULN("as-is", AS_IS);
1.127.2.22.2. (paf 59:): ULN("optimized-as-is", AS_IS|String::L_OPTIMIZE_BIT);
1.127.2.10 paf 60: ULN("file-spec", FILE_SPEC);
61: ULN("http-header", HTTP_HEADER);
62: ULN("mail-header", MAIL_HEADER);
63: ULN("uri", URI);
64: ULN("table", TABLE);
65: ULN("sql", SQL);
66: ULN("js", JS);
67: ULN("xml", XML);
1.127.2.22.2. (paf 68:): ULN("optimized-xml", XML|String::L_OPTIMIZE_BIT);
1.127.2.10 paf 69: ULN("html", HTML);
1.127.2.22.2. (paf 70:): ULN("optimized-html", HTML|String::L_OPTIMIZE_BIT);
1.127.2.10 paf 71: #undef ULN
72: }
73: } untaint_lang_name2enum;
1.127.2.1 paf 74:
1.10 paf 75: // methods
76:
1.127.2.22.2. 7(paf 77:3): static void _if(Request& r, MethodParams& params) {
78:3): Value& condition_code=params.as_junction(0, "condition must be expression");
1.1 paf 79:
1.81 paf 80: bool condition=r.process_to_value(condition_code,
1.83 paf 81: /*0/*no name* /,*/
1.127.2.22.2. 4(paf 82:3): false/*don't intercept string*/).as_bool();
1.6 paf 83: if(condition)
1.127.2.22.2. 7(paf 84:3): r.write_pass_lang(r.process(params.as_junction(1, "'then' parameter must be code")));
85:3): else if(params.count()>2)
86:3): r.write_pass_lang(r.process(params.as_junction(2, "'else' parameter must be code")));
1.1 paf 87: }
88:
1.127.2.22.2. 7(paf 89:3): static void _untaint(Request& r, MethodParams& params) {
1.1 paf 90:
1.127.2.22.2. 4(paf 91:3): String::Language lang;
7(paf 92:3): if(params.count()==1)
(paf 93:): lang=String::L_AS_IS; // mark as simply 'tainted'. useful in html from sql
1.59 paf 94: else {
1.127.2.22.2. 7(paf 95:3): const String& lang_name=params.as_string(0, "lang must be string");
1.127.2.10 paf 96: lang=untaint_lang_name2enum.get(lang_name);
1.59 paf 97: if(!lang)
1.78 paf 98: throw Exception(0,
1.127.2.22.2. 4(paf 99:3): &lang_name,
1.59 paf 100: "invalid taint language");
101: }
1.1 paf 102:
103: {
1.127.2.22.2. 7(paf 104:3): Value& vbody=params.as_junction(params.count()-1, "body must be code");
1.1 paf 105:
106: Temp_lang temp_lang(r, lang); // set temporarily specified ^untaint[language;
1.86 paf 107: r.write_pass_lang(r.process(vbody)); // process marking tainted with that lang
1.1 paf 108: }
109: }
110:
1.127.2.22.2. 7(paf 111:3): static void _taint(Request& r, MethodParams& params) {
4(paf 112:3): String::Language lang;
7(paf 113:3): if(params.count()==1)
(paf 114:): lang=String::L_TAINTED; // mark as simply 'tainted'. useful in table:set
1.1 paf 115: else {
1.127.2.22.2. 7(paf 116:3): const String& lang_name=params.as_string(0, "lang must be string");
1.127.2.10 paf 117: lang=untaint_lang_name2enum.get(lang_name);
1.1 paf 118: if(!lang)
1.78 paf 119: throw Exception(0,
1.127.2.22.2. 4(paf 120:3): &lang_name,
1.3 paf 121: "invalid taint language");
1.1 paf 122: }
123:
124: {
1.127.2.22.2. 7(paf 125:3): Value& vbody=params.as_no_junction(params.count()-1, "body must not be code");
1.1 paf 126:
1.127.2.10 paf 127: String result;
1.1 paf 128: result.append(
1.127.2.22.2. 4(paf 129:3): vbody.as_string(), // process marking tainted with that lang
1.1 paf 130: lang, true); // force result language to specified
131: r.write_pass_lang(result);
132: }
133: }
134:
1.127.2.22.2. 7(paf 135:3): static void _process(Request& r, MethodParams& params) {
(paf 136:): Method* main_method;
8(paf 137:3): Value& value=params[0];
7(paf 138:3):
139:3): Value& target_self=params.count()>1?
140:3): params.as_no_junction(0, "target must not be code")
4(paf 141:3): :r.get_method_frame()->caller()->self();
1.1 paf 142: {
1.127.2.22.2. 4(paf 143:3): VStateless_class *target_class=target_self.get_last_derived_class();
1.116 paf 144: if(!target_class)
145: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 146:3): 0,
1.116 paf 147: "no target class");
1.114 paf 148:
1.73 paf 149: // temporary remove language change
1.127.2.22.2. (paf 150:): Temp_lang temp_lang(r, String::L_PASS_APPENDED);
1.1 paf 151: // temporary zero @main so to maybe-replace it in processed code
1.127.2.22.2. 4(paf 152:3): Temp_method temp_method_main(*target_class, main_method_name, 0);
1.1 paf 153: // temporary zero @auto so it wouldn't be auto-called in Request::use_buf
1.127.2.22.2. 4(paf 154:3): Temp_method temp_method_auto(*target_class, auto_method_name, 0);
6(paf 155:3):
7(paf 156:3): if(const String* file_name=params.last().get_string()) { // ^process...[file]
6(paf 157:3): r.use_file(*target_class, r.absolute(*file_name), true/*ignore_class_path*/);
158:3): } else { // process...{string}
7(paf 159:3): Value& vjunction=params.as_junction(params.count()-1, "body must be code");
6(paf 160:3): // evaluate source to process
161:3): const String& source=r.process_to_string(vjunction);
162:3): r.use_buf(*target_class,
163:3): source.cstr(String::L_UNSPECIFIED, r.connection(false)),
164:3): pseudo_file_no__process);
165:3): }
166:3):
1.73 paf 167: // main_method
1.127.2.10 paf 168: main_method=target_class->get_method(main_method_name);
1.73 paf 169: }
170: // after restoring current-request-lang
171: // maybe-execute @main[]
172: if(main_method) {
1.119 paf 173: // temporarily set method_frame's self to target_self
174: Temp_method_frame_self tmfs(*r.get_method_frame(), target_self);
1.73 paf 175: // execute!
176: r.execute(*main_method->parser_code);
1.1 paf 177: }
178: }
179:
1.127.2.22.2. 7(paf 180:3): static void _rem(Request& r, MethodParams& params) {
181:3): params.as_junction(0, "body must be code");
1.1 paf 182: }
183:
1.127.2.22.2. 7(paf 184:3): static void _while(Request& r, MethodParams& params) {
185:3): Value& vcondition=params.as_junction(0, "condition must be expression");
186:3): Value& body=params.as_junction(1, "body must be code");
1.1 paf 187:
188: // while...
189: int endless_loop_count=0;
190: while(true) {
1.18 parser 191: if(++endless_loop_count>=MAX_LOOPS) // endless loop?
1.78 paf 192: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 193:3): 0,
1.1 paf 194: "endless loop detected");
195:
1.86 paf 196: bool condition=r.process_to_value(vcondition,
1.83 paf 197: /*0/*no name* /,*/
1.127.2.22.2. 4(paf 198:3): false/*don't intercept string*/).as_bool();
1.1 paf 199: if(!condition) // ...condition is true
200: break;
201:
202: // write processed body
1.86 paf 203: r.write_pass_lang(r.process(body));
1.1 paf 204: }
205: }
206:
1.127.2.22.2. 7(paf 207:3): static void _use(Request& r, MethodParams& params) {
208:3): Value& vfile=params.as_no_junction(0, "file name must not be code");
4(paf 209:3): r.use_file(r.main_class, vfile.as_string());
1.1 paf 210: }
211:
1.127.2.22.2. 7(paf 212:3): static void _for(Request& r, MethodParams& params) {
213:3): const String& var_name=params.as_string(0, "var name must be string");
214:3): int from=params.as_int(1, "from must be int", r);
215:3): int to=params.as_int(2, "to must be int", r);
216:3): Value& body_code=params.as_junction(3, "body must be code");
8(paf 217:3): Value* delim_maybe_code=params.count()>4?¶ms[4]:0;
1.1 paf 218:
1.57 paf 219: if(to-from>=MAX_LOOPS) // too long loop?
1.78 paf 220: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 221:3): 0,
1.57 paf 222: "endless loop detected");
223:
1.1 paf 224: bool need_delim=false;
1.127.2.22.2. 4(paf 225:3): VInt* vint=new VInt(0);
1.117 paf 226: r.get_method_frame()->caller()->put_element(var_name, vint, false);
1.1 paf 227: for(int i=from; i<=to; i++) {
228: vint->set_int(i);
229:
1.108 paf 230: StringOrValue sv_processed=r.process(body_code);
1.127.2.22.2. 4(paf 231:3): const String* s_processed=sv_processed.get_string();
(paf 232:): if(delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
1.108 paf 233: if(need_delim) // need delim & iteration produced string?
1.127.2.22.2. 4(paf 234:3): r.write_pass_lang(r.process(*delim_maybe_code));
1.1 paf 235: need_delim=true;
236: }
1.108 paf 237: r.write_pass_lang(sv_processed);
1.1 paf 238: }
239: }
240:
1.127.2.22.2. 7(paf 241:3): static void _eval(Request& r, MethodParams& params) {
242:3): Value& expr=params.as_junction(0, "need expression");
1.1 paf 243: // evaluate expresion
1.127.2.22.2. 1(paf 244:3): Value& value_result=r.process_to_value(expr,
1.83 paf 245: /*0/*no name YET* /,*/
1.127.2.22.2. 4(paf 246:3): true/*don't intercept string*/).as_expr_result();
7(paf 247:3): if(params.count()>1) {
248:3): Value& fmt=params.as_no_junction(1, "fmt must not be code");
4(paf 249:3): r.write_no_lang(String(format(value_result.as_double(), fmt.as_string().cstrm())));
1.91 paf 250: } else
1.127.2.10 paf 251: r.write_no_lang(value_result);
1.1 paf 252: }
253:
1.127.2.22.2. 7(paf 254:3): static void _connect(Request& r, MethodParams& params) {
1.63 paf 255: #ifdef RESOURCES_DEBUG
256: struct timeval mt[2];
257: #endif
1.127.2.22.2. 7(paf 258:3): Value& url=params.as_no_junction(0, "url must not be code");
259:3): Value& body_code=params.as_junction(1, "body must be code");
1.1 paf 260:
1.127.2.10 paf 261: Table* protocol2driver_and_client=0;
1.127.2.22.2. 4(paf 262:3): if(Value* sql=r.main_class.get_element(String(MAIN_SQL_NAME), r.main_class, false)) {
263:3): if(Value* element=sql->get_element(String(MAIN_SQL_DRIVERS_NAME), *sql, false)) {
1.113 paf 264: protocol2driver_and_client=element->get_table();
265: }
266: }
1.11 paf 267:
1.63 paf 268: #ifdef RESOURCES_DEBUG
269: //measure:before
270: gettimeofday(&mt[0],NULL);
271: #endif
1.1 paf 272: // connect
1.127.2.22.2. 4(paf 273:3): SQL_Connection* connection=SQL_driver_manager.get_connection(url.as_string(),
274:3): protocol2driver_and_client);
1.1 paf 275:
1.63 paf 276: #ifdef RESOURCES_DEBUG
277: //measure:after connect
278: gettimeofday(&mt[1],NULL);
279:
280: double t[2];
281: for(int i=0;i<2;i++)
282: t[i]=mt[i].tv_sec+mt[i].tv_usec/1000000.0;
283:
284: r.sql_connect_time+=t[1]-t[0];
285: #endif
1.127.2.22.2. 4(paf 286:3): Temp_connection temp_connection(r, connection);
1.1 paf 287: // execute body
1.53 parser 288: try {
1.86 paf 289: r.write_assign_lang(r.process(body_code));
1.75 paf 290: } catch(...) { // process problem
1.67 paf 291: connection->mark_to_rollback();
1.127.2.6 paf 292: rethrow;
1.1 paf 293: }
294: }
295:
1.41 parser 296: #ifndef DOXYGEN
1.127.2.10 paf 297: class Switch_data: public PA_Object {
298: public:
299: Request& r;
1.127.2.22.2. 4(paf 300:3): Value& searching;
(paf 301:): Value* found;
302:): Value* _default;
1.127.2.10 paf 303: public:
1.127.2.22.2. 4(paf 304:3): Switch_data(Request& ar, Value& asearching):
1.127.2.10 paf 305: r(ar), searching(asearching) {}
1.28 parser 306: };
1.41 parser 307: #endif
1.127.2.22.2. 7(paf 308:3): static void _switch(Request& r, MethodParams& params) {
8(paf 309:3): Switch_data* data=new Switch_data(r, r.process_to_value(params[0]));
5(paf 310:3): Temp_hash_value<const StringBody, PA_Object*>
1.127.2.10 paf 311: switch_data_setter(r.classes_conf, switch_data_name, data);
1.28 parser 312:
1.127.2.22.2. 7(paf 313:3): Value& cases_code=params.as_junction(1, "switch cases must be code");
1.82 paf 314: // execution of found ^case[...]{code} must be in context of ^switch[...]{code}
315: // because of stacked WWrapper used there as wcontext
1.84 paf 316: r.process(cases_code, true/*intercept_string*/);
1.127.2.22.2. (paf 317:): if(Value* selected_code=data->found? data->found: data->_default) {
1.83 paf 318: // setting code context, would execute in ^switch[...]{>>context<<}
1.105 paf 319: //selected_code->get_junction()->change_context(cases_code.get_junction());
1.127.2.22.2. 4(paf 320:3): r.write_pass_lang(r.process(*selected_code));
1.83 paf 321: }
1.28 parser 322: }
323:
1.127.2.22.2. 7(paf 324:3): static void _case(Request& r, MethodParams& params) {
4(paf 325:3): Switch_data* data=static_cast<Switch_data*>(r.classes_conf.get(switch_data_name));
1.38 parser 326: if(!data)
1.78 paf 327: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 328:3): 0,
1.38 parser 329: "without switch");
1.28 parser 330:
1.127.2.22.2. 7(paf 331:3): int count=params.count();
332:3): Value& code=params.as_junction(--count, "case result must be code");
1.83 paf 333:
334: // killing context for safety, would execute in ^switch[...]{>>context<<}
335: // reason: context is stacked, and it would become invalid afterwards
1.105 paf 336: //code->get_junction()->change_context(0);
1.83 paf 337:
1.28 parser 338: for(int i=0; i<count; i++) {
1.127.2.22.2. 8(paf 339:3): Value& value=r.process_to_value(params[i]);
1.28 parser 340:
1.127.2.22.2. 4(paf 341:3): if(value.as_string() == CASE_DEFAULT_VALUE) {
342:3): data->_default=&code;
1.28 parser 343: break;
344: }
345:
346: bool matches;
1.127.2.22.2. 4(paf 347:3): if(data->searching.is_string())
348:3): matches=data->searching.as_string() == value.as_string();
1.28 parser 349: else
1.127.2.22.2. 4(paf 350:3): matches=data->searching.as_double() == value.as_double();
1.28 parser 351:
352: if(matches) {
1.82 paf 353: if(data->found)
354: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 355:3): 0,
1.82 paf 356: "duplicate found");
357:
1.127.2.22.2. 4(paf 358:3): data->found=&code;
1.28 parser 359: break;
360: }
361: }
362: }
363:
1.63 paf 364: // cache--
365:
366: // consts
367:
1.127.2.22.2. (paf 368:): const int DATA_STRING_SERIALIZED_VERSION=0x0004;
1.63 paf 369:
370: // helper types
371:
372: #ifndef DOXYGEN
373: struct Data_string_serialized_prolog {
374: int version;
1.79 paf 375: time_t expires;
1.63 paf 376: };
377: #endif
378:
1.127.2.22.2. (paf 379:): void cache_delete(const String& file_spec) {
1.68 paf 380: file_delete(file_spec, false/*fail_on_read_problem*/);
1.63 paf 381: }
1.69 paf 382:
383: #ifndef DOXYGEN
1.127.2.10 paf 384: class Cache_data: public PA_Object {
385: public:
1.79 paf 386: time_t expires;
387: };
1.69 paf 388: struct Locked_process_and_cache_put_action_info {
389: Request *r;
1.79 paf 390: Cache_data *data;
1.127.2.22.2. 4(paf 391:3): Value* body_code; const String* evaluated_body;
1.69 paf 392: };
393: #endif
1.127.2.2 paf 394: /* @todo maybe network order worth spending some effort?
395: don't bothering myself with network byte order,
396: am not planning to be able to move resulting file across platforms
397: */
1.69 paf 398: static void locked_process_and_cache_put_action(int f, void *context) {
399: Locked_process_and_cache_put_action_info& info=
400: *static_cast<Locked_process_and_cache_put_action_info *>(context);
1.127.2.10 paf 401:
1.69 paf 402: // body->process
1.127.2.22.2. 4(paf 403:3): info.evaluated_body=&info.r->process_to_string(*info.body_code);
1.69 paf 404:
1.79 paf 405: // expiration time not spoiled by ^cache(0) or something?
406: if(info.data->expires > time(0)) {
407: // string -serialize> buffer
1.127.2.22.2. 4(paf 408:3): String::C serialized=info.evaluated_body->serialize(
409:3): sizeof(Data_string_serialized_prolog));
1.79 paf 410: Data_string_serialized_prolog& prolog=
1.127.2.22.2. 4(paf 411:3): *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str);
1.79 paf 412: prolog.version=DATA_STRING_SERIALIZED_VERSION;
413: prolog.expires=info.data->expires;
414:
415: // buffer -write> file
1.127.2.22.2. 4(paf 416:3): write(f, serialized.str, serialized.length);
1.79 paf 417: } else // expired!
418: info.data->expires=0; // flag it so that could be easily checked by caller
1.69 paf 419: }
1.127.2.22.2. 4(paf 420:3): const String* locked_process_and_cache_put(Request& r,
421:3): Value& body_code,
422:3): Cache_data& data,
423:3): const String& file_spec) {
1.127.2.10 paf 424: Locked_process_and_cache_put_action_info info;
425: info.r=&r;
426: info.data=&data;
1.127.2.22.2. 4(paf 427:3): info.body_code=&body_code;
1.69 paf 428:
1.127.2.22.2. 4(paf 429:3): const String* result=file_write_action_under_lock(
1.69 paf 430: file_spec,
431: "cache_put", locked_process_and_cache_put_action, &info,
432: false/*as_text*/,
433: false/*do_append*/,
1.96 paf 434: false/*block*/,
1.127.2.22.2. (paf 435:): false/*fail on lock problem*/) ? info.evaluated_body: 0;
1.100 paf 436: time_t now=time(0);
437: if(data.expires<=now)
1.79 paf 438: cache_delete(file_spec);
439: return result;
1.63 paf 440: }
1.127.2.22.2. 4(paf 441:3): const String* cache_get(Charset& charset, const String& file_spec, time_t now) {
(paf 442:): File_read_result file=file_read(charset, file_spec,
1.63 paf 443: false/*as_text*/,
1.127.2.10 paf 444: 0, //no params
445: false/*fail_on_read_problem*/);
1.127.2.22.2. 4(paf 446:3): if(file.success && file.length/* ignore reads which are empty due to
1.72 paf 447: non-unary open+lockEX conflict with lockSH */) {
1.127.2.10 paf 448:
1.72 paf 449: Data_string_serialized_prolog& prolog=
1.127.2.22.2. 4(paf 450:3): *reinterpret_cast<Data_string_serialized_prolog *>(file.str);
1.63 paf 451:
1.127.2.22.2. 4(paf 452:3): String* result=new String;
1.72 paf 453: if(
1.127.2.22.2. 4(paf 454:3): file.length>=sizeof(Data_string_serialized_prolog)
1.72 paf 455: && prolog.version==DATA_STRING_SERIALIZED_VERSION
1.79 paf 456: && prolog.expires > now
1.127.2.22.2. 4(paf 457:3): && result->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length))
1.72 paf 458: return result;
459: }
1.63 paf 460:
1.127.2.22.2. (paf 461:): return 0;
1.63 paf 462: }
1.127.2.22.2. 7(paf 463:3): static time_t as_expires(Request& r, MethodParams& params,
1.79 paf 464: int index, time_t now) {
465: time_t result;
1.127.2.22.2. 8(paf 466:3): if(Value* vdate=params[index].as(VDATE_TYPE, false))
1.127.2.10 paf 467: result=static_cast<VDate*>(vdate)->get_time();
1.79 paf 468: else
1.127.2.22.2. 7(paf 469:3): result=now+(time_t)params.as_double(index, "lifespan must be date or number", r);
1.79 paf 470:
471: return result;
472: }
1.127.2.22.2. 7(paf 473:3): static const String& as_file_spec(Request& r, MethodParams& params, int index) {
474:3): return r.absolute(params.as_string(index, "filespec must be string"));
1.79 paf 475: }
1.127.2.22.2. 7(paf 476:3): static void _cache(Request& r, MethodParams& params) {
1.79 paf 477: time_t now=time(0);
478:
479: // ^cache[filename] ^cache(seconds) ^cache[expires date]
1.127.2.22.2. 7(paf 480:3): if(params.count()==1) {
8(paf 481:3): if(params[0].is_string()) { // filename?
1.79 paf 482: cache_delete(as_file_spec(r, params, 0));
483: return;
484: }
485:
486: // secods|expires date
1.127.2.22.2. 4(paf 487:3): Cache_data* data=static_cast<Cache_data*>(r.classes_conf.get(cache_data_name));
1.79 paf 488: if(!data)
489: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 490:3): 0,
1.79 paf 491: "expire-time reducing instruction without cache");
492:
1.127.2.22.2. 4(paf 493:3): time_t expires=as_expires(r, params, 0, now);
1.79 paf 494: if(expires < data->expires)
495: data->expires=expires;
496:
497: return;
498: }
1.63 paf 499:
500: // file_spec, expires, body code
1.127.2.22.2. 7(paf 501:3): const String& file_spec=r.absolute(params.as_string(0, "filespec must be string"));
1.65 paf 502:
1.127.2.22.2. 4(paf 503:3): Cache_data* data=new Cache_data;
5(paf 504:3): Temp_hash_value<const StringBody, PA_Object*>
1.127.2.10 paf 505: cache_data_setter(r.classes_conf, cache_data_name, data);
1.127.2.22.2. 4(paf 506:3): data->expires=as_expires(r, params, 1, now);
7(paf 507:3): Value& body_code=params.as_junction(2, "body must be code");
1.63 paf 508:
1.127.2.10 paf 509: if(data->expires>now) { // valid 'expires' specified? try cached copy...
1.69 paf 510: // hence we don't hope to have unary create/lockEX
511: // we need some plan to live in a life like that, so...
512: // worst races plan:
513: // A B
514: // open
515: // |open
516: // lockSH
517: // |nonblocking-lockEX fails
518: // unlockSH
519: // close, cache_get returns 0
520: // open
521: // nonblocking-lockEX succeeds; process, write, close
522: // |retry1: open
523: // ...
524: // |lockSH succeeds; ...
525:
526: for(int retry=0; retry<2; retry++) {
1.127.2.22.2. 4(paf 527:3): if(const String* cached_body=cache_get(r.charsets.source(), file_spec, now)) { // have cached copy?
1.79 paf 528: // write it out
529: r.write_assign_lang(*cached_body);
530: // happy with it
531: return;
532: }
1.69 paf 533:
534: // non-blocked lock; process; cache it
1.127.2.22.2. 4(paf 535:3): if(const String* processed_body=
1.127.2.10 paf 536: locked_process_and_cache_put(r, body_code, *data, file_spec)) {
1.63 paf 537: // write it out
1.69 paf 538: r.write_assign_lang(*processed_body);
1.63 paf 539: // happy with it
540: return;
1.69 paf 541: } else { // somebody writing result right now
542: pa_sleep(0, 500000); // waiting half a second
543: retry=0; // prolonging our wait, than could cache_get it, without processing body_code
1.63 paf 544: }
1.69 paf 545: }
1.78 paf 546: throw Exception(0,
1.127.2.22.2. 4(paf 547:3): &file_spec,
1.69 paf 548: "locking problem");
549: } else {
1.79 paf 550: // instructed not to cache; forget cached copy
1.68 paf 551: cache_delete(file_spec);
1.69 paf 552: // process
1.127.2.22.2. (paf 553:): const String& processed_body=r.process_to_string(body_code);
1.69 paf 554: // write it out
1.127.2.22.2. 4(paf 555:3): r.write_assign_lang(processed_body);
1.69 paf 556: // happy with it
557: return;
558: }
559: // never reached
1.63 paf 560: }
561:
1.74 paf 562:
1.127.2.22.2. 5(paf 563:3):
564:3): // also used in pa_request.C to pass param to @unhandled_exception
1.74 paf 565:
1.127.2.22.2. 7(paf 566:3): static void _try_operator(Request& r, MethodParams& params) {
567:3): Value& body_code=params.as_junction(0, "body_code must be code");
568:3): Value& catch_code=params.as_junction(1, "catch_code must be code");
1.74 paf 569:
1.86 paf 570: StringOrValue result;
1.123 paf 571: // taking snapshot of try-context
572: Request_context_saver try_context(r);
1.74 paf 573: try {
1.86 paf 574: result=r.process(body_code);
1.74 paf 575: } catch(const Exception& e) {
1.123 paf 576: Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error]
577: try_context.restore(); // restoring try-context to perform catch-code
578:
1.127.2.22.2. 5(paf 579:3): Request::Exception_details details=r.get_details(e);
1.74 paf 580:
1.127.2.22.2. 4(paf 581:3): Junction* junction=catch_code.get_junction();
1.127.2.10 paf 582: Value* method_frame=junction->method_frame;
1.127.2.22.2. (paf 583:): Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false);
5(paf 584:3): junction->method_frame->put_element(exception_var_name, &details.vhash, false);
1.86 paf 585: result=r.process(catch_code);
1.74 paf 586: bool handled=false;
1.127.2.22.2. (paf 587:): if(Value* value=
5(paf 588:3): details.vhash.hash().get(exception_handled_part_name))
1.74 paf 589: handled=value->as_bool();
1.127.2.10 paf 590: junction->method_frame->put_element(exception_var_name, saved_exception_var_value, false);
1.74 paf 591:
1.123 paf 592: if(!handled) {
593: throw_context.restore(); // restoring throw-context [exception were not handled]
1.127.2.22.2. 4(paf 594:3): rethrow;
595:3): }
1.74 paf 596: }
1.123 paf 597: // write out result
1.86 paf 598: r.write_pass_lang(result);
1.74 paf 599: }
600:
1.127.2.22.2. 7(paf 601:3): static void _throw_operator(Request& r, MethodParams& params) {
602:3): if(params.count()==1) {
8(paf 603:3): if(HashStringValue *hash=params[0].get_hash()) {
1.127.2.5 paf 604: const char* type=0;
1.127.2.22.2. (paf 605:): if(Value* value=hash->get(exception_type_part_name))
606:): type=value->as_string().cstr();
4(paf 607:3): const String* source=0;
(paf 608:): if(Value* value=hash->get(exception_source_part_name))
4(paf 609:3): source=&value->as_string();
(paf 610:): const char* comment;
611:): if(Value* value=hash->get(exception_comment_part_name))
612:): comment=value->as_string().cstr();
1.74 paf 613:
1.78 paf 614: throw Exception(type,
1.127.2.22.2. 4(paf 615:3): source?source:0,
616:3): "%s", comment?comment:"");
1.74 paf 617: } else
1.78 paf 618: throw Exception("parser.runtime",
1.127.2.22.2. 4(paf 619:3): 0,
1.74 paf 620: "one-param version has hash param");
621: } else {
1.127.2.22.2. 7(paf 622:3): const char* type=params.as_string(0, "type must be string").cstr();
623:3): const String& source=params.as_string(1, "source must be string");
624:3): const char* comment=params.count()>2? params.as_string(2, "comment must be string").cstr()
1(paf 625:3): :0;
4(paf 626:3): throw Exception(type, &source, "%s", comment?comment:"");
1.74 paf 627: }
628: }
1.127.2.20 paf 629:
630: #if defined(WIN32) && defined(_DEBUG)
631: # define PA_BPT
1.127.2.22.2. 7(paf 632:3): static void _bpt(Request& r, MethodParams& params) {
1.127.2.20 paf 633: _asm int 3;
634: }
635: #endif
636:
1.10 paf 637: // constructor
638:
1.127.2.10 paf 639: VClassMAIN::VClassMAIN(): VClass() {
1.127.2.22.2. 4(paf 640:3): set_name(*new String(MAIN_CLASS_NAME));
1.127.2.20 paf 641:
642: #ifdef PA_BPT
643: // ^bpt[]
644: add_native_method("bpt", Method::CT_ANY, _bpt, 0, 0);
645: #endif
1.121 paf 646:
1.1 paf 647: // ^if(condition){code-when-true}
648: // ^if(condition){code-when-true}{code-when-false}
1.10 paf 649: add_native_method("if", Method::CT_ANY, _if, 2, 3);
1.1 paf 650:
651: // ^untaint[as-is|uri|sql|js|html|html-typo]{code}
1.59 paf 652: add_native_method("untaint", Method::CT_ANY, _untaint, 1, 2);
1.1 paf 653:
654: // ^taint[as-is|uri|sql|js|html|html-typo]{code}
1.10 paf 655: add_native_method("taint", Method::CT_ANY, _taint, 1, 2);
1.1 paf 656:
657: // ^process[code]
1.116 paf 658: add_native_method("process", Method::CT_ANY, _process, 1, 2);
1.1 paf 659:
660: // ^rem{code}
1.51 parser 661: add_native_method("rem", Method::CT_ANY, _rem, 1, 10000);
1.1 paf 662:
663: // ^while(condition){code}
1.10 paf 664: add_native_method("while", Method::CT_ANY, _while, 2, 2);
1.1 paf 665:
666: // ^use[file]
1.10 paf 667: add_native_method("use", Method::CT_ANY, _use, 1, 1);
1.1 paf 668:
1.54 paf 669: // ^for[i](from-number;to-number-inclusive){code}[delim]
1.10 paf 670: add_native_method("for", Method::CT_ANY, _for, 3+1, 3+1+1);
1.1 paf 671:
672: // ^eval(expr)
673: // ^eval(expr)[format]
1.10 paf 674: add_native_method("eval", Method::CT_ANY, _eval, 1, 2);
1.52 parser 675:
1.1 paf 676: // ^connect[protocol://user:pass@host[:port]/database]{code with ^sql-s}
1.10 paf 677: add_native_method("connect", Method::CT_ANY, _connect, 2, 2);
678:
1.63 paf 679:
1.65 paf 680: // ^cache[file_spec] delete cache
1.63 paf 681: // ^cache[file_spec](time){code} time=0 no cache
1.65 paf 682: add_native_method("cache", Method::CT_ANY, _cache, 1, 3);
1.63 paf 683:
1.28 parser 684: // switch
685:
686: // ^switch[value]{cases}
687: add_native_method("switch", Method::CT_ANY, _switch, 2, 2);
688:
689: // ^case[value]{code}
1.51 parser 690: add_native_method("case", Method::CT_ANY, _case, 2, 10000);
1.74 paf 691:
692: // try-catch
693:
694: // ^try{code}{catch code}
695: add_native_method("try", Method::CT_ANY, _try_operator, 2, 2);
696: // ^throw[$exception hash]
697: // ^throw[type;source;comment]
698: add_native_method("throw", Method::CT_ANY, _throw_operator, 1, 3);
699:
1.10 paf 700: }
1.11 paf 701:
702: // constructor & configurator
1.1 paf 703:
1.127.2.22.2. 4(paf 704:3): VStateless_class& VClassMAIN_create() {
705:3): return *new VClassMAIN;
1.1 paf 706: }
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