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nostrdb: filter: use relative data offsets for easy cloning

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Instead of storing exact pointers inside of our filter elements, just
store offsets. This will allow us to clone filters very easily without
having to mess around with fixing up the pointers afterwards.

Signed-off-by: William Casarin <jb55@jb55.com>
This commit is contained in:
William Casarin
2024-02-09 13:58:41 -08:00
committed by Daniel D’Aquino
parent 1c63c3b9bb
commit 3c5a83392e
2 changed files with 194 additions and 120 deletions
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12
nostrdb/src/nostrdb.h
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@@ -234,7 +234,9 @@ struct ndb_filter_field {
struct ndb_filter_elements {
struct ndb_filter_field field;
int count;
union ndb_filter_element elements[0];
// this needs to be pointer size for reasons
uint64_t elements[0];
};
struct ndb_filter {
@@ -242,8 +244,10 @@ struct ndb_filter {
struct cursor data_buf;
int num_elements;
int finalized;
struct ndb_filter_elements *current;
struct ndb_filter_elements *elements[NDB_NUM_FILTERS];
int current;
// struct ndb_filter_elements offsets into elem_buf
int elements[NDB_NUM_FILTERS];
};
struct ndb_config {
@@ -479,6 +483,8 @@ int ndb_filter_init(struct ndb_filter *);
int ndb_filter_add_id_element(struct ndb_filter *, const unsigned char *id);
int ndb_filter_add_int_element(struct ndb_filter *, uint64_t integer);
int ndb_filter_add_str_element(struct ndb_filter *, const char *str);
struct ndb_filter_elements *ndb_filter_current_element(struct ndb_filter *);
int ndb_filter_start_field(struct ndb_filter *, enum ndb_filter_fieldtype);
int ndb_filter_start_tag_field(struct ndb_filter *, char tag);
int ndb_filter_matches(struct ndb_filter *, struct ndb_note *);