Fix cmds requesting too quickly in a loop uids from pubkey with BMA (#438)

Specially happening in local condition, where there is no network latency

• blocks, history -u, and transfer commands
• Define BMA_SLEEP constant to 0.1 second
• Set time.sleep(BMA_SLEEP) between the requests

Close #438 (closed), #3 (closed).

silkaj/blockchain/blocks.py

@@ -13,6 +13,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
 
+import time
 from collections import OrderedDict
 from operator import itemgetter
 from typing import List
@@ -24,7 +25,7 @@ from pendulum import from_timestamp
 
 from silkaj import tui
 from silkaj.blockchain.tools import get_head_block
-from silkaj.constants import ALL
+from silkaj.constants import ALL, BMA_SLEEP
 from silkaj.network import client_instance
 from silkaj.wot.tools import identity_of
 
@@ -61,6 +62,7 @@ def list_blocks(number: int, detailed: bool) -> None:
         issuers.append(issuer)
     for pubkey in issuers_dict.keys():
         issuer = issuers_dict[pubkey]
+        time.sleep(BMA_SLEEP)
         try:
             idty = identity_of(issuer["pubkey"])
         except HTTPError: