Annotation of parser3/src/types/pa_vmemcached.C, revision 1.11
1.1 moko 1: /** @file
2: Parser: memcached class.
3:
4: Copyright (c) 2001-2012 Art. Lebedev Studio (http://www.artlebedev.com)
5: Authors:
6: Ivan Poluyanov <ivan-poluyanov@yandex.ru>
7: Artem Stepanov <timofei1394@thesecure.in>
8: */
9:
10: #include "pa_vmemcached.h"
11: #include "pa_value.h"
12: #include "pa_vstring.h"
1.2 moko 13: #include "pa_vhash.h"
1.1 moko 14: #include "pa_vvoid.h"
15:
1.11 ! moko 16: volatile const char * IDENT_PA_VMEMCACHED_C="$Id: pa_vmemcached.C,v 1.10 2012-04-22 22:06:50 moko Exp $" IDENT_PA_VMEMCACHED_H;
1.1 moko 17:
18: #ifdef WIN32
19: const char *memcached_library="libmemcached.dll";
20: #else
21: const char *memcached_library="libmemcached.so";
22: #endif
23:
1.8 moko 24: // support functions
25:
26: static void error(const char *step, memcached_st* m, memcached_return rc) {
1.1 moko 27: const char* str=f_memcached_strerror(m, rc);
28: throw Exception("memcached", 0, "%s error: %s (%d)", step, str ? str : "<unknown>", rc);
29: }
30:
1.2 moko 31: inline void check(const char *action, memcached_st* m, memcached_return rc) {
1.1 moko 32: if(rc==MEMCACHED_SUCCESS)
33: return;
1.2 moko 34: error(action, m, rc);
1.1 moko 35: }
36:
1.6 moko 37: inline void check_key(const String& akey) {
38: if(akey.is_empty())
39: throw Exception("memcached", 0, "key must not be empty");
40: if(akey.length() > MEMCACHED_MAX_KEY)
41: throw Exception("memcached", &akey, "key length %d exceeds limit (%d bytes)", akey.length(), MEMCACHED_MAX_KEY);
42: }
43:
1.8 moko 44: // serialization helpers
45:
46: #define SERIALIZED_STRING 256
47:
48: struct Serialization_data{
49: unsigned int flags;
50: const char *ptr;
51: size_t length;
52:
53: Serialization_data() : flags(0), ptr(0), length(0){}
54: Serialization_data(unsigned int aflags) : flags(aflags), ptr(0), length(0){}
55: Serialization_data(unsigned int aflags, const char *aptr, size_t alength) : flags(aflags), ptr(aptr), length(alength){}
56: };
57:
58: static void serialize_string(const String &str, Serialization_data &data){
59: if(str.is_empty()){
60: data = Serialization_data(SERIALIZED_STRING);
61: return;
62: }
63:
64: if (str.is_not_just_lang()){
65: String::Cm cm = str.serialize(0);
66: data = Serialization_data(SERIALIZED_STRING, cm.str, cm.length);
67: } else {
68: data = Serialization_data(SERIALIZED_STRING + (unsigned int)str.just_lang(), str.cstr(), str.length());
69: }
70: }
71:
72: static VString *deserialize_string(Serialization_data &data){
73: String *result;
74:
75: if(data.flags==SERIALIZED_STRING){
76: result = new String();
77: if (data.length>0 && !result->deserialize(0, (void *)data.ptr, data.length))
78: return NULL;
79: } else {
80: // we can't use length from memcached as there can be '\0' inside
81: String::Language lang=(String::Language)(data.flags-SERIALIZED_STRING);
82: result = new String(data.ptr, lang);
83: }
84:
85: return new VString(*result);
86: }
87:
88: static Value &deserialize(Serialization_data &data){
89: Value *result=NULL;
90:
91: if(data.flags>=SERIALIZED_STRING && data.flags<(SERIALIZED_STRING+256)){
92: // String->deserialize uses passed string
1.9 moko 93: if(data.length>0)
94: data.ptr=pa_strdup(data.ptr, data.length);
1.8 moko 95: result=deserialize_string(data);
96: }
97:
98: if (!result)
99: throw Exception(PARSER_RUNTIME, 0, "unable to deserialize data id %d, size %d", data.flags, data.length);
100:
101: return *result;
102: }
103:
104: // VMemcached
105:
1.10 moko 106: static void load_memcached(const char *library){
1.1 moko 107: const char *memcached_status = memcached_load(library);
108:
109: if(memcached_status)
110: throw Exception("memcached", 0, "failed to load memcached library %s: %s", library, memcached_status);
1.10 moko 111: }
112:
113: void VMemcached::open(const String& options_string, time_t attl){
114: load_memcached(memcached_library);
115:
116: if(f_memcached==NULL)
117: throw Exception("memcached", 0, "options hash requires libmemcached version 0.49 or later");
118:
119: if(options_string.is_empty())
120: throw Exception("memcached", 0, "options hash must not be empty");
121:
122: fttl=attl;
123: fm=f_memcached(options_string.cstr(), options_string.length());
124: }
1.1 moko 125:
1.10 moko 126: void VMemcached::open_parse(const String& connect_string, time_t attl){
127: load_memcached(memcached_library);
128:
1.1 moko 129: if(connect_string.is_empty())
1.10 moko 130: throw Exception("memcached", 0, "connect string must not be empty");
131:
1.2 moko 132: fttl=attl;
1.1 moko 133: fm=f_memcached_create(NULL);
134: memcached_server_st* fservers = f_memcached_servers_parse(connect_string.cstr());
135: check("server_push", fm, f_memcached_server_push(fm, fservers));
136: }
137:
1.6 moko 138: void VMemcached::flush(time_t attl) {
1.2 moko 139: check("flush", fm, f_memcached_flush(fm, attl));
140: }
141:
1.6 moko 142: void VMemcached::remove(const String& aname) {
143: check_key(aname);
144:
145: memcached_return rc=f_memcached_delete(fm, aname.cstr(), aname.length(), (time_t)0);
1.1 moko 146:
147: if(rc != MEMCACHED_SUCCESS && rc != MEMCACHED_NOTFOUND)
148: error("delete", fm, rc);
149: }
150:
151: Value* VMemcached::get_element(const String& aname) {
152: if(Value *result=VStateless_object::get_element(aname))
153: return result;
154:
1.6 moko 155: check_key(aname);
1.1 moko 156:
157: memcached_return rc;
1.5 moko 158: Serialization_data data;
159: data.ptr=f_memcached_get(fm, aname.cstr(), aname.length(), &data.length, &data.flags, &rc);
1.1 moko 160:
1.5 moko 161: if(rc==MEMCACHED_SUCCESS){
1.8 moko 162: return &deserialize(data);
1.5 moko 163: }
1.4 moko 164:
1.2 moko 165: if(rc==MEMCACHED_NOTFOUND)
1.11 ! moko 166: return VVoid::get();
1.1 moko 167:
168: error("get", fm, rc);
169: return 0; // calm down compiler
170: }
171:
1.2 moko 172: Value &VMemcached::mget(ArrayString& akeys) {
173: VHash &hresult = *new VHash();
174:
175: size_t kl = akeys.count();
176:
177: if(kl==0)
178: return hresult;
179:
180: const char **keys = new const char *[kl];
1.3 moko 181: size_t *key_lengths = new size_t[kl];
1.2 moko 182:
1.6 moko 183: for(size_t i=0; i<kl; i++){
184: const String &skey = *(akeys[i]);
185: check_key(skey);
186: keys[i] = skey.cstr();
187: key_lengths[i] = skey.length();
1.2 moko 188: }
189:
1.3 moko 190: check("mget", fm, f_memcached_mget(fm, keys, key_lengths, kl));
1.2 moko 191:
1.7 moko 192: // memcached_fetch_result calls memcached_result_create and memcached_result_free, we don't need to do this.
193: memcached_result_st *results=0;
1.4 moko 194: memcached_return rc;
195:
1.7 moko 196: while((results=f_memcached_fetch_result(fm, results, &rc)) && (rc == MEMCACHED_SUCCESS)){
1.4 moko 197: const char *hkey = pa_strdup(f_memcached_result_key_value(results), f_memcached_result_key_length(results));
1.8 moko 198: Serialization_data data(f_memcached_result_flags(results), f_memcached_result_value(results), f_memcached_result_length(results));
1.5 moko 199:
1.8 moko 200: hresult.hash().put(hkey, &deserialize(data));
1.2 moko 201: }
1.4 moko 202:
203: if (rc != MEMCACHED_END && rc != MEMCACHED_NOTFOUND)
204: error("mget", fm, rc);
1.2 moko 205:
1.3 moko 206: delete keys;
207: delete key_lengths;
208:
1.2 moko 209: return hresult;
210: }
1.1 moko 211:
1.11 ! moko 212: static inline time_t serialize_value(time_t ttl, const String& aname, Value* avalue, Serialization_data &data){
1.1 moko 213:
214: if(HashStringValue* hash=avalue->get_hash()) {
1.11 ! moko 215: int valid_options=1;
! 216: if(Value* ttl_value=hash->get(expires_name)){
1.1 moko 217: ttl=ttl_value->as_int();
1.11 ! moko 218: valid_options++;
! 219: }
! 220: if(avalue=hash->get(value_name)){
! 221: if(avalue->get_junction())
1.1 moko 222: throw Exception("memcached", 0, VALUE_NAME " must not be code");
223: } else
1.2 moko 224: throw Exception("memcached", &aname, "value hash must contain ." VALUE_NAME);
1.11 ! moko 225:
! 226: if(valid_options!=hash->count())
! 227: throw Exception(PARSER_RUNTIME, 0, CALLED_WITH_INVALID_OPTION);
1.1 moko 228: }
229:
1.8 moko 230: if(avalue->is_string()){
231: serialize_string(*avalue->get_string(), data);
232: } else {
233: throw Exception("memcached", &aname, "%s serialization not supported yet", avalue->type());
234: }
1.1 moko 235:
1.11 ! moko 236: return ttl;
! 237: }
! 238:
! 239: bool VMemcached::add(const String& aname, Value* avalue){
! 240: check_key(aname);
! 241:
! 242: Serialization_data data;
! 243: time_t ttl=serialize_value(fttl, aname, avalue, data);
! 244:
! 245: memcached_return rc=f_memcached_add(fm, aname.cstr(), aname.length(), data.ptr, data.length, ttl, data.flags);
! 246:
! 247: if(rc == MEMCACHED_NOTSTORED)
! 248: return false;
! 249:
! 250: if(rc != MEMCACHED_SUCCESS)
! 251: error("add", fm, rc);
! 252:
! 253: return true;
! 254: }
! 255:
! 256: const VJunction* VMemcached::put_element(const String& aname, Value* avalue, bool /*replace*/){
! 257: check_key(aname);
! 258:
! 259: Serialization_data data;
! 260: time_t ttl=serialize_value(fttl, aname, avalue, data);
! 261:
! 262: check("set", fm, f_memcached_set(fm, aname.cstr(), aname.length(), data.ptr, data.length, ttl, data.flags));
1.1 moko 263:
264: return PUT_ELEMENT_REPLACED_ELEMENT;
265: }
266:
E-mail:
![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to pa_vmemcached.C CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [parser3project] / parser3 / src / types