mirror of https://github.com/yandex/odyssey.git
54 lines
990 B
C
54 lines
990 B
C
#ifndef ODYSSEY_ID_H
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#define ODYSSEY_ID_H
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/*
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* Odyssey.
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*
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* Scalable PostgreSQL connection pooler.
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*/
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typedef struct od_id od_id_t;
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typedef struct od_id_mgr od_id_mgr_t;
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#define OD_ID_SEEDMAX 6
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struct od_id {
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char *id_prefix;
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char id[OD_ID_SEEDMAX * 2];
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uint64_t id_a;
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uint64_t id_b;
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};
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static inline int od_id_cmp(od_id_t *a, od_id_t *b)
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{
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return memcmp(a->id, b->id, sizeof(a->id)) == 0;
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}
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static inline void od_id_generate(od_id_t *id, char *prefix)
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{
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long int a = machine_lrand48();
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long int b = machine_lrand48();
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char seed[OD_ID_SEEDMAX];
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memcpy(seed + 0, &a, 4);
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memcpy(seed + 4, &b, 2);
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id->id_prefix = prefix;
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id->id_a = a;
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id->id_b = b;
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static const char *hex = "0123456789abcdef";
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int q, w;
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for (q = 0, w = 0; q < OD_ID_SEEDMAX; q++) {
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id->id[w++] = hex[(seed[q] >> 4) & 0x0F];
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id->id[w++] = hex[(seed[q]) & 0x0F];
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}
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#if OD_DEVEL_LVL != -1
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assert(w == (OD_ID_SEEDMAX * 2));
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#endif
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}
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void od_id_generator_seed(void);
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#endif /* ODYSSEY_ID_H */
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