From 0cd0f085862b543b86d01d1e57fe17d6e687221e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20N=C3=BA=C3=B1ez?= <david@nucypher.com>
Date: Thu, 4 Jun 2020 16:21:42 +0200
Subject: [PATCH] Introduce a cooling time when trying to get confirmations

---
 nucypher/blockchain/eth/clients.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/nucypher/blockchain/eth/clients.py b/nucypher/blockchain/eth/clients.py
index 868e1995f..fa2be6599 100644
--- a/nucypher/blockchain/eth/clients.py
+++ b/nucypher/blockchain/eth/clients.py
@@ -111,7 +111,8 @@ class EthereumClient:
     SYNC_TIMEOUT_DURATION = 60  # seconds to wait for various blockchain syncing endeavors
     SYNC_SLEEP_DURATION = 5  # seconds
     BLOCK_CONFIRMATIONS_POLLING_TIME = 3  # seconds
-    TRANSACTION_POLLING_TIME = 0.5  # seconds  # TODO: Override this in InfuraClient
+    TRANSACTION_POLLING_TIME = 0.5  # seconds
+    COOLING_TIME = 5  # seconds
 
     class ConnectionNotEstablished(RuntimeError):
         pass
@@ -287,6 +288,10 @@ class EthereumClient:
                          confirmations: int = 0) -> TxReceipt:
         receipt = None
         if confirmations:
+            # If we're waiting for confirmations, we may as well let pass some time initially to make everything easier
+            time.sleep(self.COOLING_TIME)
+
+            # We'll keep trying to get receipts until there are enough confirmations or the timeout happens
             with Timeout(seconds=timeout, exception=self.TransactionTimeout) as timeout_context:
                 while not receipt:
                     try:
@@ -511,6 +516,7 @@ class GanacheClient(EthereumClient):
 
 class InfuraClient(EthereumClient):
     is_local = False
+    TRANSACTION_POLLING_TIME = 2  # seconds
 
     def unlock_account(self, *args, **kwargs) -> bool:
         return True