feat(shdict): multi-subsystems lua_shared_dict support

[tzssangglass]

No description provided.

[tzssangglass]

Note: should revert ci.yml before merge to master

[tzssangglass]

build apisix-base with: api7/apisix-build-tools#190

[spacewander]

Better to use ngx_lua_ffi_shdict_udata_to_zone and update it with ngx_lua_ffi_shdict_udata_to_zone = C.ngx_meta_lua_ffi_shdict_udata_to_zone. And other similar places.

[tzssangglass]

now it looks like

local ngx_lua_ffi_shdict_get
local ngx_lua_ffi_shdict_incr
local ngx_lua_ffi_shdict_store
local ngx_lua_ffi_shdict_flush_all
local ngx_lua_ffi_shdict_get_ttl
local ngx_lua_ffi_shdict_set_expire
local ngx_lua_ffi_shdict_capacity
local ngx_lua_ffi_shdict_free_space
local ngx_lua_ffi_shdict_udata_to_zone


ffi.cdef[[
int ngx_meta_lua_ffi_shdict_get(void *zone, const unsigned char *key,
    size_t key_len, int *value_type, unsigned char **str_value_buf,
    size_t *str_value_len, double *num_value, int *user_flags,
    int get_stale, int *is_stale, char **errmsg);

int ngx_meta_lua_ffi_shdict_incr(void *zone, const unsigned char *key,
    size_t key_len, double *value, char **err, int has_init,
    double init, long init_ttl, int *forcible);

int ngx_meta_lua_ffi_shdict_store(void *zone, int op,
    const unsigned char *key, size_t key_len, int value_type,
    const unsigned char *str_value_buf, size_t str_value_len,
    double num_value, long exptime, int user_flags, char **errmsg,
    int *forcible);

int ngx_meta_lua_ffi_shdict_flush_all(void *zone);

long ngx_meta_lua_ffi_shdict_get_ttl(void *zone,
    const unsigned char *key, size_t key_len);

int ngx_meta_lua_ffi_shdict_set_expire(void *zone,
    const unsigned char *key, size_t key_len, long exptime);

size_t ngx_meta_lua_ffi_shdict_capacity(void *zone);

void *ngx_meta_lua_ffi_shdict_udata_to_zone(void *zone_udata);
]]

if not pcall(function ()
    return C.ngx_meta_lua_ffi_shdict_free_space
end)
then
    ffi.cdef[[
size_t ngx_meta_lua_ffi_shdict_free_space(void *zone);
    ]]
end

pcall(function ()
    ngx_lua_ffi_shdict_get = C.ngx_meta_lua_ffi_shdict_get
    ngx_lua_ffi_shdict_incr = C.ngx_meta_lua_ffi_shdict_incr
    ngx_lua_ffi_shdict_store = C.ngx_meta_lua_ffi_shdict_store
    ngx_lua_ffi_shdict_flush_all = C.ngx_meta_lua_ffi_shdict_flush_all
    ngx_lua_ffi_shdict_get_ttl = C.ngx_meta_lua_ffi_shdict_get_ttl
    ngx_lua_ffi_shdict_set_expire = C.ngx_meta_lua_ffi_shdict_set_expire
    ngx_lua_ffi_shdict_capacity = C.ngx_meta_lua_ffi_shdict_capacity
    ngx_lua_ffi_shdict_free_space = C.ngx_meta_lua_ffi_shdict_free_space
    ngx_lua_ffi_shdict_udata_to_zone = C.ngx_meta_lua_ffi_shdict_udata_to_zone
end)

if not pcall(function () return C.free end) then
    ffi.cdef[[
void free(void *ptr);
    ]]
end