Allow ephemeral node and node storage default in Finnegans Wake demo.

examples/finnegans_wake_demo/finnegans-wake-concise-demo.py

@@ -1,15 +1,15 @@
-import datetime
 import os
-import shutil
 
+import datetime
 import maya
+import shutil
 from twisted.logger import globalLogPublisher
+from umbral.keys import UmbralPublicKey
 
 from nucypher.characters.lawful import Alice, Bob, Ursula
 from nucypher.data_sources import DataSource as Enrico
 from nucypher.network.middleware import RestMiddleware
-from nucypher.utilities.logging import simpleObserver
-from umbral.keys import UmbralPublicKey
+from nucypher.utilities.logging import SimpleObserver
 
 ######################
 # Boring setup stuff #
@@ -19,18 +19,7 @@ from umbral.keys import UmbralPublicKey
 BOOK_PATH = os.path.join('.', 'finnegans-wake.txt')
 
 # Twisted Logger
-globalLogPublisher.addObserver(simpleObserver)
-
-# Temporary file storage
-TEMP_FILES_DIR = "{}/examples-runtime-cruft".format(os.path.dirname(os.path.abspath(__file__)))
-TEMP_DEMO_DIR = "{}/finnegans-wake-demo".format(TEMP_FILES_DIR)
-TEMP_CERTIFICATE_DIR = "{}/certs".format(TEMP_DEMO_DIR)
-
-# Remove previous demo files and create new ones
-shutil.rmtree(TEMP_FILES_DIR, ignore_errors=True)
-os.mkdir(TEMP_FILES_DIR)
-os.mkdir(TEMP_DEMO_DIR)
-os.mkdir(TEMP_CERTIFICATE_DIR)
+globalLogPublisher.addObserver(SimpleObserver())
 
 
 #######################################
@@ -38,13 +27,12 @@ os.mkdir(TEMP_CERTIFICATE_DIR)
 # (will fail with bad connection) #####
 #######################################
 
-TESTNET_LOAD_BALANCER = "eu-federated-balancer-40be4480ec380cd7.elb.eu-central-1.amazonaws.com"
+SEEDNODE_URI = "https://localhost:11501"
 
 ##############################################
 # Ursula, the Untrusted Re-Encryption Proxy  #
 ##############################################
-ursula = Ursula.from_seed_and_stake_info(host=TESTNET_LOAD_BALANCER,
-                                         certificates_directory=TEMP_CERTIFICATE_DIR,
+ursula = Ursula.from_seed_and_stake_info(seed_uri=SEEDNODE_URI,
                                          federated_only=True,
                                          minimum_stake=0)
 
@@ -60,8 +48,7 @@ label = b"secret/files/and/stuff"
 ALICE = Alice(network_middleware=RestMiddleware(),
               known_nodes=[ursula],
               learn_on_same_thread=True,
-              federated_only=True,
-              known_certificates_dir=TEMP_CERTIFICATE_DIR)
+              federated_only=True)
 
 # Alice can get the public key even before creating the policy.
 # From this moment on, any Data Source that knows the public key
@@ -69,13 +56,11 @@ ALICE = Alice(network_middleware=RestMiddleware(),
 # any Bob that Alice grants access.
 policy_pubkey = ALICE.get_policy_pubkey_from_label(label)
 
-BOB = Bob(
-    known_nodes=[ursula],
-    network_middleware=RestMiddleware(),
-    federated_only=True,
-    start_learning_now=True,
-    learn_on_same_thread=True,
-    known_certificates_dir=TEMP_CERTIFICATE_DIR)
+BOB = Bob(known_nodes=[ursula],
+          network_middleware=RestMiddleware(),
+          federated_only=True,
+          start_learning_now=True,
+          learn_on_same_thread=True)
 
 ALICE.start_learning_loop(now=True)
 
@@ -127,9 +112,9 @@ for counter, plaintext in enumerate(finnegans_wake):
     # single passage from James Joyce's Finnegan's Wake.
     # The matter of whether encryption makes the passage more or less readable
     # is left to the reader to determine.
-    single_passage_ciphertext, _signature = enciro.encrypt_message(plaintext)
-    data_source_public_key = bytes(enciro.stamp)
-    del enciro
+    single_passage_ciphertext, _signature = enrico.encrypt_message(plaintext)
+    data_source_public_key = bytes(enrico.stamp)
+    del enrico
 
     ###############
     # Back to Bob #