Annotation of parser3/src/types/pa_vmemcached.C, revision 1.9
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:
1.9 ! moko 16: volatile const char * IDENT_PA_VMEMCACHED_C="$Id: pa_vmemcached.C,v 1.8 2012-04-18 21:42:51 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:
1.2 moko 106: void VMemcached::open(const String& connect_string, time_t attl){
1.1 moko 107: const char *library = memcached_library;
108: const char *memcached_status = memcached_load(library);
109:
110: if(memcached_status)
111: throw Exception("memcached", 0, "failed to load memcached library %s: %s", library, memcached_status);
112:
113: if(connect_string.is_empty())
114: throw Exception("memcached", 0, "server name must not be empty");
115:
1.2 moko 116: fttl=attl;
1.1 moko 117:
118: fm=f_memcached_create(NULL);
119:
120: memcached_server_st* fservers = f_memcached_servers_parse(connect_string.cstr());
121: check("server_push", fm, f_memcached_server_push(fm, fservers));
122: }
123:
1.6 moko 124: void VMemcached::flush(time_t attl) {
1.2 moko 125: check("flush", fm, f_memcached_flush(fm, attl));
126: }
127:
1.6 moko 128: void VMemcached::remove(const String& aname) {
129: check_key(aname);
130:
131: memcached_return rc=f_memcached_delete(fm, aname.cstr(), aname.length(), (time_t)0);
1.1 moko 132:
133: if(rc != MEMCACHED_SUCCESS && rc != MEMCACHED_NOTFOUND)
134: error("delete", fm, rc);
135: }
136:
137: Value* VMemcached::get_element(const String& aname) {
138: if(Value *result=VStateless_object::get_element(aname))
139: return result;
140:
1.6 moko 141: check_key(aname);
1.1 moko 142:
143: memcached_return rc;
1.5 moko 144: Serialization_data data;
145: data.ptr=f_memcached_get(fm, aname.cstr(), aname.length(), &data.length, &data.flags, &rc);
1.1 moko 146:
1.5 moko 147: if(rc==MEMCACHED_SUCCESS){
1.8 moko 148: return &deserialize(data);
1.5 moko 149: }
1.4 moko 150:
1.2 moko 151: if(rc==MEMCACHED_NOTFOUND)
1.1 moko 152: return new VVoid();
153:
154: error("get", fm, rc);
155: return 0; // calm down compiler
156: }
157:
1.2 moko 158: Value &VMemcached::mget(ArrayString& akeys) {
159: VHash &hresult = *new VHash();
160:
161: size_t kl = akeys.count();
162:
163: if(kl==0)
164: return hresult;
165:
166: const char **keys = new const char *[kl];
1.3 moko 167: size_t *key_lengths = new size_t[kl];
1.2 moko 168:
1.6 moko 169: for(size_t i=0; i<kl; i++){
170: const String &skey = *(akeys[i]);
171: check_key(skey);
172: keys[i] = skey.cstr();
173: key_lengths[i] = skey.length();
1.2 moko 174: }
175:
1.3 moko 176: check("mget", fm, f_memcached_mget(fm, keys, key_lengths, kl));
1.2 moko 177:
1.7 moko 178: // memcached_fetch_result calls memcached_result_create and memcached_result_free, we don't need to do this.
179: memcached_result_st *results=0;
1.4 moko 180: memcached_return rc;
181:
1.7 moko 182: while((results=f_memcached_fetch_result(fm, results, &rc)) && (rc == MEMCACHED_SUCCESS)){
1.4 moko 183: const char *hkey = pa_strdup(f_memcached_result_key_value(results), f_memcached_result_key_length(results));
1.8 moko 184: Serialization_data data(f_memcached_result_flags(results), f_memcached_result_value(results), f_memcached_result_length(results));
1.5 moko 185:
1.8 moko 186: hresult.hash().put(hkey, &deserialize(data));
1.2 moko 187: }
1.4 moko 188:
189: if (rc != MEMCACHED_END && rc != MEMCACHED_NOTFOUND)
190: error("mget", fm, rc);
1.2 moko 191:
1.3 moko 192: delete keys;
193: delete key_lengths;
194:
1.2 moko 195: return hresult;
196: }
1.1 moko 197:
198: const VJunction* VMemcached::put_element(const String& aname, Value* avalue, bool /*replace*/){
1.6 moko 199: check_key(aname);
1.1 moko 200:
1.2 moko 201: time_t ttl=fttl;
202: Value* lvalue;
1.1 moko 203:
204: if(HashStringValue* hash=avalue->get_hash()) {
205: if(Value* ttl_value=hash->get(expires_name))
206: ttl=ttl_value->as_int();
207: if(lvalue=hash->get(value_name)){
208: if(lvalue->get_junction())
209: throw Exception("memcached", 0, VALUE_NAME " must not be code");
210: } else
1.2 moko 211: throw Exception("memcached", &aname, "value hash must contain ." VALUE_NAME);
1.1 moko 212: } else {
213: lvalue=avalue;
214: }
215:
1.8 moko 216: Serialization_data data;
217: if(avalue->is_string()){
218: serialize_string(*avalue->get_string(), data);
219: } else {
220: throw Exception("memcached", &aname, "%s serialization not supported yet", avalue->type());
221: }
1.1 moko 222:
223: check("set", fm, f_memcached_set(
224: fm,
1.6 moko 225: aname.cstr(),
226: aname.length(),
1.8 moko 227: data.ptr,
228: data.length,
1.1 moko 229: ttl,
1.8 moko 230: data.flags));
1.1 moko 231:
232: return PUT_ELEMENT_REPLACED_ELEMENT;
233: }
234:
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