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| version 1.129, 2003/07/24 11:31:20 | version 1.140, 2003/11/20 17:07:44 |
|---|---|
| Line 5 | Line 5 |
| Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru) | Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru) |
| */ | */ |
| static const char* IDENT_OP_C="$Date$"; | static const char * const IDENT_OP_C="$Date$"; |
| #include "classes.h" | #include "classes.h" |
| #include "pa_vmethod_frame.h" | #include "pa_vmethod_frame.h" |
| #include "pa_common.h" | #include "pa_common.h" |
| #include "pa_os.h" | |
| #include "pa_request.h" | #include "pa_request.h" |
| #include "pa_vint.h" | #include "pa_vint.h" |
| #include "pa_sql_connection.h" | #include "pa_sql_connection.h" |
| Line 48 static const String cache_data_name(CACH | Line 49 static const String cache_data_name(CACH |
| static const String exception_var_name(EXCEPTION_VAR_NAME); | static const String exception_var_name(EXCEPTION_VAR_NAME); |
| // local defines | |
| #define CACHE_EXCEPTION_HANDLED_CACHE_NAME "cache" | |
| // helpers | // helpers |
| class Untaint_lang_name2enum: public Hash<const StringBody, String::Language> { | class Untaint_lang_name2enum: public Hash<const String::Body, String::Language> { |
| public: | public: |
| Untaint_lang_name2enum() { | Untaint_lang_name2enum() { |
| #define ULN(name, LANG) \ | #define ULN(name, LANG) \ |
| put(StringBody(name), (value_type)(String::L_##LANG)); | put(String::Body(name), (value_type)(String::L_##LANG)); |
| ULN("as-is", AS_IS); | ULN("as-is", AS_IS); |
| ULN("optimized-as-is", AS_IS|String::L_OPTIMIZE_BIT); | ULN("optimized-as-is", AS_IS|String::L_OPTIMIZE_BIT); |
| ULN("file-spec", FILE_SPEC); | ULN("file-spec", FILE_SPEC); |
| Line 78 static void _if(Request& r, MethodParams | Line 83 static void _if(Request& r, MethodParams |
| Value& condition_code=params.as_junction(0, "condition must be expression"); | Value& condition_code=params.as_junction(0, "condition must be expression"); |
| bool condition=r.process_to_value(condition_code, | bool condition=r.process_to_value(condition_code, |
| /*0/*no name* /,*/ | |
| false/*don't intercept string*/).as_bool(); | false/*don't intercept string*/).as_bool(); |
| if(condition) | if(condition) |
| r.write_pass_lang(r.process(params.as_junction(1, "'then' parameter must be code"))); | r.write_pass_lang(r.process(params.as_junction(1, "'then' parameter must be code"))); |
| Line 188 static void _process(Request& r, MethodP | Line 192 static void _process(Request& r, MethodP |
| } | } |
| } | } |
| static void _rem(Request& r, MethodParams& params) { | static void _rem(Request&, MethodParams& params) { |
| params.as_junction(0, "body must be code"); | params.as_junction(0, "body must be code"); |
| } | } |
| Line 205 static void _while(Request& r, MethodPar | Line 209 static void _while(Request& r, MethodPar |
| "endless loop detected"); | "endless loop detected"); |
| bool condition=r.process_to_value(vcondition, | bool condition=r.process_to_value(vcondition, |
| /*0/*no name* /,*/ | |
| false/*don't intercept string*/).as_bool(); | false/*don't intercept string*/).as_bool(); |
| if(!condition) // ...condition is true | if(!condition) // ...condition is true |
| break; | break; |
| Line 253 static void _eval(Request& r, MethodPara | Line 256 static void _eval(Request& r, MethodPara |
| Value& expr=params.as_junction(0, "need expression"); | Value& expr=params.as_junction(0, "need expression"); |
| // evaluate expresion | // evaluate expresion |
| Value& value_result=r.process_to_value(expr, | Value& value_result=r.process_to_value(expr, |
| /*0/*no name YET* /,*/ | |
| true/*don't intercept string*/).as_expr_result(); | true/*don't intercept string*/).as_expr_result(); |
| if(params.count()>1) { | if(params.count()>1) { |
| Value& fmt=params.as_no_junction(1, "fmt must not be code"); | Value& fmt=params.as_no_junction(1, "fmt must not be code"); |
| Line 321 public: | Line 323 public: |
| #endif | #endif |
| static void _switch(Request& r, MethodParams& params) { | static void _switch(Request& r, MethodParams& params) { |
| Switch_data* data=new Switch_data(r, r.process_to_value(params[0])); | Switch_data* data=new Switch_data(r, r.process_to_value(params[0])); |
| Temp_hash_value<const StringBody, PA_Object*> | Temp_hash_value<const String::Body, void*> |
| switch_data_setter(r.classes_conf, switch_data_name, data); | switch_data_setter(r.classes_conf, switch_data_name, data); |
| Value& cases_code=params.as_junction(1, "switch cases must be code"); | Value& cases_code=params.as_junction(1, "switch cases must be code"); |
| Line 374 static void _case(Request& r, MethodPara | Line 376 static void _case(Request& r, MethodPara |
| } | } |
| } | } |
| } | } |
| #ifndef DOXYGEN | |
| struct Try_catch_result { | |
| StringOrValue processed_code; | |
| const String* exception_should_be_handled; | |
| Try_catch_result(): exception_should_be_handled(0) {} | |
| }; | |
| #endif | |
| /// used by ^try and ^cache, @returns $exception.handled[string] if any | |
| template<class I> | |
| static Try_catch_result try_catch(Request& r, | |
| StringOrValue body_code(Request&, I), I info, | |
| Value* catch_code) | |
| { | |
| Try_catch_result result; | |
| if(!catch_code) { | |
| result.processed_code=body_code(r, info); | |
| return result; | |
| } | |
| // taking snapshot of try-context | |
| Request_context_saver try_context(r); | |
| try { | |
| result.processed_code=body_code(r, info); | |
| } catch(const Exception& e) { | |
| Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error] | |
| Request::Exception_details details=r.get_details(e); | |
| try_context.restore(); // restoring try-context to perform catch-code | |
| Junction* junction=catch_code->get_junction(); | |
| Value* method_frame=junction->method_frame; | |
| Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false); | |
| junction->method_frame->put_element(exception_var_name, &details.vhash, false); | |
| result.processed_code=r.process(*catch_code); | |
| // retriving $exception.handled, restoring $exception var | |
| Value* vhandled=details.vhash.hash().get(exception_handled_part_name); | |
| junction->method_frame->put_element(exception_var_name, saved_exception_var_value, false); | |
| bool bhandled=false; | |
| if(vhandled) { | |
| if(vhandled->is_string()) { // not simple $exception.handled(1/0)? | |
| result.exception_should_be_handled=vhandled->get_string(); // considering 'recovered' and let the caller recover | |
| return result; | |
| } | |
| bhandled=vhandled->as_bool(); | |
| } | |
| if(!bhandled) { | |
| throw_context.restore(); // restoring throw-context [exception were not handled] | |
| rethrow; | |
| } | |
| } | |
| return result; | |
| } | |
| // cache-- | // cache-- |
| // consts | // consts |
| const int DATA_STRING_SERIALIZED_VERSION=0x0004; | const int DATA_STRING_SERIALIZED_VERSION=0x0005; |
| // helper types | // helper types |
| Line 395 void cache_delete(const String& file_spe | Line 454 void cache_delete(const String& file_spe |
| } | } |
| #ifndef DOXYGEN | #ifndef DOXYGEN |
| class Cache_data: public PA_Object { | struct Cache_scope { |
| public: | public: |
| time_t expires; | time_t expires; |
| const String* body_from_disk; | |
| }; | }; |
| struct Locked_process_and_cache_put_action_info { | struct Locked_process_and_cache_put_action_info { |
| Request *r; | Request *r; |
| Cache_data *data; | Cache_scope *scope; |
| Value* body_code; const String* evaluated_body; | Value* body_code; Value* catch_code; |
| const String* processed_code; | |
| }; | }; |
| #endif | #endif |
| static StringOrValue process_cache_body_code(Request& r, Value* body_code) { | |
| return StringOrValue(&r.process_to_string(*body_code), 0); | |
| } | |
| /* @todo maybe network order worth spending some effort? | /* @todo maybe network order worth spending some effort? |
| don't bothering myself with network byte order, | don't bothering myself with network byte order, |
| am not planning to be able to move resulting file across platforms | am not planning to be able to move resulting file across platforms |
| Line 414 static void locked_process_and_cache_put | Line 482 static void locked_process_and_cache_put |
| *static_cast<Locked_process_and_cache_put_action_info *>(context); | *static_cast<Locked_process_and_cache_put_action_info *>(context); |
| // body->process | // body->process |
| info.evaluated_body=&info.r->process_to_string(*info.body_code); | Try_catch_result result=try_catch(*info.r, |
| process_cache_body_code, info.body_code, | |
| info.catch_code); | |
| if(result.exception_should_be_handled) { | |
| if(*result.exception_should_be_handled==CACHE_EXCEPTION_HANDLED_CACHE_NAME) { | |
| if(const String* body_from_disk=info.scope->body_from_disk) // we have something old? | |
| info.processed_code=body_from_disk; | |
| else | |
| throw Exception(0, | |
| new String("$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME"["CACHE_EXCEPTION_HANDLED_CACHE_NAME"]"), | |
| "fallback failed - there is no old cached body"); | |
| } else | |
| throw Exception("parser.runtime", | |
| result.exception_should_be_handled, | |
| "$"EXCEPTION_VAR_NAME"."EXCEPTION_HANDLED_PART_NAME" value must be " | |
| "either boolean or string '"CACHE_EXCEPTION_HANDLED_CACHE_NAME"'"); | |
| } else | |
| info.processed_code=&result.processed_code.as_string(); | |
| // expiration time not spoiled by ^cache(0) or something? | // expiration time not spoiled by ^cache(0) or something? |
| if(info.data->expires > time(0)) { | if(info.scope->expires > time(0)) { |
| // string -serialize> buffer | // string -serialize> buffer |
| String::Cm serialized=info.evaluated_body->serialize( | String::Cm serialized=info.processed_code->serialize( |
| sizeof(Data_string_serialized_prolog)); | sizeof(Data_string_serialized_prolog)); |
| Data_string_serialized_prolog& prolog= | Data_string_serialized_prolog& prolog= |
| *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str); | *reinterpret_cast<Data_string_serialized_prolog *>(serialized.str); |
| prolog.version=DATA_STRING_SERIALIZED_VERSION; | prolog.version=DATA_STRING_SERIALIZED_VERSION; |
| prolog.expires=info.data->expires; | prolog.expires=info.scope->expires; |
| // buffer -write> file | // buffer -write> file |
| write(f, serialized.str, serialized.length); | write(f, serialized.str, serialized.length); |
| } else // expired! | } else // expired! |
| info.data->expires=0; // flag it so that could be easily checked by caller | info.scope->expires=0; // flag it so that could be easily checked by caller |
| } | } |
| const String* locked_process_and_cache_put(Request& r, | const String* locked_process_and_cache_put(Request& r, |
| Value& body_code, | Value& body_code, |
| Cache_data& data, | Value* catch_code, |
| const String& file_spec) { | Cache_scope& scope, |
| Locked_process_and_cache_put_action_info info={0}; | const String& file_spec) |
| info.r=&r; | { |
| info.data=&data; | Locked_process_and_cache_put_action_info info={&r, &scope, &body_code, catch_code, 0}; |
| info.body_code=&body_code; | |
| const String* result=file_write_action_under_lock( | const String* result=file_write_action_under_lock( |
| file_spec, | file_spec, |
| Line 446 const String* locked_process_and_cache_p | Line 531 const String* locked_process_and_cache_p |
| false/*as_text*/, | false/*as_text*/, |
| false/*do_append*/, | false/*do_append*/, |
| false/*block*/, | false/*block*/, |
| false/*fail on lock problem*/) ? info.evaluated_body: 0; | false/*fail on lock problem*/) ? info.processed_code: 0; |
| time_t now=time(0); | time_t now=time(0); |
| if(data.expires<=now) | if(scope.expires<=now) |
| cache_delete(file_spec); | cache_delete(file_spec); |
| return result; | return result; |
| } | } |
| const String* cache_get(Request_charsets& charsets, const String& file_spec, time_t now) { | #ifndef DOXYGEN |
| struct Cache_get_result { | |
| const String* body; | |
| bool expired; | |
| }; | |
| #endif | |
| static Cache_get_result cache_get(Request_charsets& charsets, const String& file_spec, time_t now) { | |
| Cache_get_result result={0, false}; | |
| File_read_result file=file_read(charsets, file_spec, | File_read_result file=file_read(charsets, file_spec, |
| false/*as_text*/, | false/*as_text*/, |
| 0, //no params | 0, //no params |
| Line 463 const String* cache_get(Request_charsets | Line 556 const String* cache_get(Request_charsets |
| Data_string_serialized_prolog& prolog= | Data_string_serialized_prolog& prolog= |
| *reinterpret_cast<Data_string_serialized_prolog *>(file.str); | *reinterpret_cast<Data_string_serialized_prolog *>(file.str); |
| String* result=new String; | String* body=new String; |
| if( | if( |
| file.length>=sizeof(Data_string_serialized_prolog) | file.length>=sizeof(Data_string_serialized_prolog) |
| && prolog.version==DATA_STRING_SERIALIZED_VERSION | && prolog.version==DATA_STRING_SERIALIZED_VERSION) { |
| && prolog.expires > now | if(body->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length)) { |
| && result->deserialize(sizeof(Data_string_serialized_prolog), file.str, file.length)) | result.body=body; |
| return result; | result.expired=prolog.expires <= now; |
| } | |
| } | |
| } | } |
| return 0; | return result; |
| } | } |
| static time_t as_expires(Request& r, MethodParams& params, | static time_t as_expires(Request& r, MethodParams& params, |
| int index, time_t now) { | int index, time_t now) { |
| Line 498 static void _cache(Request& r, MethodPar | Line 593 static void _cache(Request& r, MethodPar |
| } | } |
| // secods|expires date | // secods|expires date |
| Cache_data* data=static_cast<Cache_data*>(r.classes_conf.get(cache_data_name)); | Cache_scope* scope=static_cast<Cache_scope*>(r.classes_conf.get(cache_data_name)); |
| if(!data) | if(!scope) |
| throw Exception("parser.runtime", | throw Exception("parser.runtime", |
| 0, | 0, |
| "expire-time reducing instruction without cache"); | "expire-time reducing instruction without cache"); |
| time_t expires=as_expires(r, params, 0, now); | time_t expires=as_expires(r, params, 0, now); |
| if(expires < data->expires) | if(expires < scope->expires) |
| data->expires=expires; | scope->expires=expires; |
| return; | return; |
| } | } |
| Line 514 static void _cache(Request& r, MethodPar | Line 609 static void _cache(Request& r, MethodPar |
| // file_spec, expires, body code | // file_spec, expires, body code |
| const String& file_spec=r.absolute(params.as_string(0, "filespec must be string")); | const String& file_spec=r.absolute(params.as_string(0, "filespec must be string")); |
| Cache_data* data=new Cache_data; | Cache_scope scope={as_expires(r, params, 1, now)}; |
| Temp_hash_value<const StringBody, PA_Object*> | |
| cache_data_setter(r.classes_conf, cache_data_name, data); | Temp_hash_value<const String::Body, void*> |
| data->expires=as_expires(r, params, 1, now); | cache_scope_setter(r.classes_conf, cache_data_name, &scope); |
| Value& body_code=params.as_junction(2, "body must be code"); | Value& body_code=params.as_junction(2, "body_code must be code"); |
| Value* catch_code=0; | |
| if(params.count()>3) | |
| catch_code=¶ms.as_junction(3, "catch_code must be code"); | |
| if(data->expires>now) { // valid 'expires' specified? try cached copy... | if(scope.expires>now) { // valid 'expires' specified? try cached copy... |
| // hence we don't hope to have unary create/lockEX | // hence we don't hope to have unary create/lockEX |
| // we need some plan to live in a life like that, so... | // we need some plan to live in a life like that, so... |
| // worst races plan: | // worst races plan: |
| Line 538 static void _cache(Request& r, MethodPar | Line 636 static void _cache(Request& r, MethodPar |
| // |lockSH succeeds; ... | // |lockSH succeeds; ... |
| for(int retry=0; retry<2; retry++) { | for(int retry=0; retry<2; retry++) { |
| if(const String* cached_body=cache_get(r.charsets, file_spec, now)) { // have cached copy? | Cache_get_result cached=cache_get(r.charsets, file_spec, now); |
| // write it out | if(cached.body) { // have cached copy |
| r.write_assign_lang(*cached_body); | if(cached.expired) |
| // happy with it | scope.body_from_disk=cached.body; // storing for user to retrive it with ^cache[] |
| return; | else // and it's not expired yet |
| { | |
| // write it out | |
| r.write_assign_lang(*cached.body); | |
| // happy with it | |
| return; | |
| } | |
| } | } |
| // non-blocked lock; process; cache it | // non-blocked lock; process; cache it |
| if(const String* processed_body= | if(const String* processed_body= |
| locked_process_and_cache_put(r, body_code, *data, file_spec)) { | locked_process_and_cache_put(r, body_code, catch_code, scope, file_spec)) { |
| // write it out | // write it out |
| r.write_assign_lang(*processed_body); | r.write_assign_lang(*processed_body); |
| // happy with it | // happy with it |
| return; | return; |
| } else { // somebody writing result right now | } else { // somebody writing result right now |
| pa_sleep(0, 500000); // waiting half a second | pa_sleep(0, 500000); // waiting half a second |
| retry=0; // prolonging our wait, than could cache_get it, without processing body_code | retry=0; // prolonging our wait, than could cache_get it, without processing body_code |
| } | } |
| } | } |
| throw Exception(0, | throw Exception(0, |
| &file_spec, | &file_spec, |
| Line 573 static void _cache(Request& r, MethodPar | Line 677 static void _cache(Request& r, MethodPar |
| // never reached | // never reached |
| } | } |
| static StringOrValue process_try_body_code(Request& r, Value* body_code) { | |
| return r.process(*body_code); | |
| // also used in pa_request.C to pass param to @unhandled_exception | } |
| static void _try_operator(Request& r, MethodParams& params) { | static void _try_operator(Request& r, MethodParams& params) { |
| Value& body_code=params.as_junction(0, "body_code must be code"); | Value& body_code=params.as_junction(0, "body_code must be code"); |
| Value& catch_code=params.as_junction(1, "catch_code must be code"); | Value& catch_code=params.as_junction(1, "catch_code must be code"); |
| StringOrValue result; | Try_catch_result result=try_catch(r, |
| // taking snapshot of try-context | process_try_body_code, &body_code, |
| Request_context_saver try_context(r); | &catch_code); |
| try { | |
| result=r.process(body_code); | if(result.exception_should_be_handled) |
| } catch(const Exception& e) { | throw Exception("parser.runtime", |
| Request::Exception_details details=r.get_details(e); | result.exception_should_be_handled, |
| "catch block must set $exception.handled to some boolean value, not string"); | |
| Request_context_saver throw_context(r); // taking snapshot of throw-context [stack trace contains error] | |
| try_context.restore(); // restoring try-context to perform catch-code | |
| Junction* junction=catch_code.get_junction(); | |
| Value* method_frame=junction->method_frame; | |
| Value* saved_exception_var_value=method_frame->get_element(exception_var_name, *method_frame, false); | |
| junction->method_frame->put_element(exception_var_name, &details.vhash, false); | |
| result=r.process(catch_code); | |
| bool handled=false; | |
| if(Value* value= | |
| details.vhash.hash().get(exception_handled_part_name)) | |
| handled=value->as_bool(); | |
| junction->method_frame->put_element(exception_var_name, saved_exception_var_value, false); | |
| if(!handled) { | // write out processed body_code or catch_code |
| throw_context.restore(); // restoring throw-context [exception were not handled] | r.write_pass_lang(result.processed_code); |
| rethrow; | |
| } | |
| } | |
| // write out result | |
| r.write_pass_lang(result); | |
| } | } |
| static void _throw_operator(Request& r, MethodParams& params) { | static void _throw_operator(Request&, MethodParams& params) { |
| if(params.count()==1) { | if(params.count()==1) { |
| if(HashStringValue *hash=params[0].get_hash()) { | if(HashStringValue *hash=params[0].get_hash()) { |
| const char* type=0; | const char* type=0; |
| Line 621 static void _throw_operator(Request& r, | Line 706 static void _throw_operator(Request& r, |
| const String* source=0; | const String* source=0; |
| if(Value* value=hash->get(exception_source_part_name)) | if(Value* value=hash->get(exception_source_part_name)) |
| source=&value->as_string(); | source=&value->as_string(); |
| const char* comment; | const char* comment=0; |
| if(Value* value=hash->get(exception_comment_part_name)) | if(Value* value=hash->get(exception_comment_part_name)) |
| comment=value->as_string().cstr(); | comment=value->as_string().cstr(); |
| Line 639 static void _throw_operator(Request& r, | Line 724 static void _throw_operator(Request& r, |
| :0; | :0; |
| throw Exception(type, &source, "%s", comment?comment:""); | throw Exception(type, &source, "%s", comment?comment:""); |
| } | } |
| } | } |
| #if defined(WIN32) && defined(_DEBUG) | #if defined(WIN32) && defined(_DEBUG) |
| # define PA_BPT | # define PA_BPT |
| static void _bpt(Request& r, MethodParams& params) { | static void _bpt(Request&, MethodParams&) { |
| _asm int 3; | _asm int 3; |
| } | } |
| #endif | #endif |
| Line 691 VClassMAIN::VClassMAIN(): VClass() { | Line 776 VClassMAIN::VClassMAIN(): VClass() { |
| add_native_method("connect", Method::CT_ANY, _connect, 2, 2); | add_native_method("connect", Method::CT_ANY, _connect, 2, 2); |
| // ^cache[file_spec](time){code}[{catch code}] time=0 no cache | |
| // ^cache[file_spec] delete cache | // ^cache[file_spec] delete cache |
| // ^cache[file_spec](time){code} time=0 no cache | add_native_method("cache", Method::CT_ANY, _cache, 1, 4); |
| add_native_method("cache", Method::CT_ANY, _cache, 1, 3); | |
| // switch | // switch |