[+] mempool: datum get api.

(cherry picked from commit 05bdfcfc)

modules/mempool/dap_chain_mempool.c

@@ -1166,6 +1166,24 @@ dap_chain_datum_token_emission_t *dap_chain_mempool_emission_get(dap_chain_t *a_
     return l_ret;
 }
 
+dap_chain_datum_t *dap_chain_mempool_datum_get(dap_chain_t *a_chain, const char *a_datum_hash_str)
+{
+    size_t l_datum_size;
+    char *l_gdb_group = dap_chain_net_get_gdb_group_mempool_new(a_chain);
+    dap_chain_datum_t *l_datum = (dap_chain_datum_t *)dap_global_db_get_sync(l_gdb_group,
+                                                    a_datum_hash_str, &l_datum_size, NULL, NULL );
+    if (!l_datum) {
+        char *l_emission_hash_str_from_base58 = dap_enc_base58_to_hex_str_from_str(a_datum_hash_str);
+        l_datum = (dap_chain_datum_t *)dap_global_db_get_sync(l_gdb_group,
+                                    l_emission_hash_str_from_base58, &l_datum_size, NULL, NULL );
+        DAP_DELETE(l_emission_hash_str_from_base58);
+    }
+    
+    DAP_DELETE(l_gdb_group);
+    
+    return l_datum;
+}
+
 dap_chain_datum_token_emission_t *dap_chain_mempool_datum_emission_extract(dap_chain_t *a_chain, byte_t *a_data, size_t a_size)
 {
     if (!a_chain || !a_data || a_size < sizeof(dap_chain_datum_t))

modules/mempool/include/dap_chain_mempool.h

@@ -101,6 +101,7 @@ char *dap_chain_mempool_base_tx_create(dap_chain_t *a_chain, dap_chain_hash_fast
                                        dap_chain_id_t a_emission_chain_id, uint256_t a_emission_value, const char *a_ticker, dap_chain_addr_t *a_addr_to, dap_enc_key_t *a_private_key,
                                        const char *a_hash_out_type, uint256_t a_value_fee);
 
+dap_chain_datum_t *dap_chain_mempool_datum_get(dap_chain_t *a_chain, const char *a_emission_hash_str);
 dap_chain_datum_token_emission_t *dap_chain_mempool_emission_get(dap_chain_t *a_chain, const char *a_emission_hash_str);
 dap_chain_datum_token_emission_t *dap_chain_mempool_datum_emission_extract(dap_chain_t *a_chain, byte_t *a_data, size_t a_size);
 char *dap_chain_mempool_tx_coll_fee_create(dap_chain_cs_blocks_t *a_blocks, dap_enc_key_t *a_key_from, const dap_chain_addr_t* a_addr_to, dap_list_t *a_block_list,