Annotation of parser3/src/types/pa_vmemcached.C, revision 1.10
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:
1.10 ! moko 16: volatile const char * IDENT_PA_VMEMCACHED_C="$Id: pa_vmemcached.C,v 1.9 2012-04-18 21:51:28 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)
1.1 moko 166: return new VVoid();
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:
212: const VJunction* VMemcached::put_element(const String& aname, Value* avalue, bool /*replace*/){
1.6 moko 213: check_key(aname);
1.1 moko 214:
1.2 moko 215: time_t ttl=fttl;
216: Value* lvalue;
1.1 moko 217:
218: if(HashStringValue* hash=avalue->get_hash()) {
219: if(Value* ttl_value=hash->get(expires_name))
220: ttl=ttl_value->as_int();
221: if(lvalue=hash->get(value_name)){
222: if(lvalue->get_junction())
223: throw Exception("memcached", 0, VALUE_NAME " must not be code");
224: } else
1.2 moko 225: throw Exception("memcached", &aname, "value hash must contain ." VALUE_NAME);
1.1 moko 226: } else {
227: lvalue=avalue;
228: }
229:
1.8 moko 230: Serialization_data data;
231: if(avalue->is_string()){
232: serialize_string(*avalue->get_string(), data);
233: } else {
234: throw Exception("memcached", &aname, "%s serialization not supported yet", avalue->type());
235: }
1.1 moko 236:
237: check("set", fm, f_memcached_set(
238: fm,
1.6 moko 239: aname.cstr(),
240: aname.length(),
1.8 moko 241: data.ptr,
242: data.length,
1.1 moko 243: ttl,
1.8 moko 244: data.flags));
1.1 moko 245:
246: return PUT_ELEMENT_REPLACED_ELEMENT;
247: }
248:
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