[KMS-ETH]- Publish arrangement method

nkms_eth/policies.py

@@ -63,3 +63,31 @@ class BlockchainPolicy:
 
     def __init__(self):
         self._arrangements = list()
+
+    def publish_arrangement(self, miner, periods: int, rate: int, arrangement_id: bytes=None) -> 'BlockchainArrangement':
+        """
+        Create a new arrangement to carry out a blockchain policy for the specified rate and time.
+        """
+
+        value = rate * periods
+        arrangement = BlockchainArrangement(author=self,
+                                            miner=miner,
+                                            value=value,
+                                            periods=periods)
+
+        self._arrangements[arrangement.id] = {arrangement_id: arrangement}
+        return arrangement
+
+    def get_arrangement(self, arrangement_id: bytes) -> BlockchainArrangement:
+        """Fetch a published arrangement from the blockchain"""
+
+        blockchain_record = self.policy_agent.read().policies(arrangement_id)
+        author_address, miner_address, rate, start_block, end_block, downtime_index = blockchain_record
+
+        duration = end_block - start_block
+
+        miner = Miner(address=miner_address, miner_agent=self.policy_agent.miner_agent)
+        arrangement = BlockchainArrangement(author=self, miner=miner, periods=duration)
+
+        arrangement.is_published = True
+        return arrangement

nkms_eth/utilities.py

@@ -9,6 +9,7 @@ from nkms_eth.deployers import MinerEscrowDeployer, NuCypherKMSTokenDeployer
 
 class TesterBlockchain(TheBlockchain):
     """Transient, in-memory, local, private chain"""
+
     _network = 'tester'
 
     def wait_time(self, wait_hours, step=50):