read checkpoints file in NetworkConstants, add it to setup.py

lib/bitcoin.py

@@ -37,13 +37,13 @@ from . import version
 from .util import print_error, InvalidPassword, assert_bytes, to_bytes, inv_dict
 from . import segwit_addr
 
-def read_json_dict(filename):
+def read_json(filename, default):
     path = os.path.join(os.path.dirname(__file__), filename)
     try:
         with open(path, 'r') as f:
             r = json.loads(f.read())
     except:
-        r = {}
+        r = default
     return r
 
 
@@ -78,10 +78,10 @@ class NetworkConstants:
         cls.ADDRTYPE_P2PKH = 0
         cls.ADDRTYPE_P2SH = 5
         cls.SEGWIT_HRP = "bc"
-        cls.HEADERS_URL = "https://headers.electrum.org/blockchain_headers"
         cls.GENESIS = "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"
         cls.DEFAULT_PORTS = {'t': '50001', 's': '50002'}
-        cls.DEFAULT_SERVERS = read_json_dict('servers.json')
+        cls.DEFAULT_SERVERS = read_json('servers.json', {})
+        cls.CHECKPOINTS = read_json('checkpoints.json', [])
 
     @classmethod
     def set_testnet(cls):
@@ -90,10 +90,10 @@ class NetworkConstants:
         cls.ADDRTYPE_P2PKH = 111
         cls.ADDRTYPE_P2SH = 196
         cls.SEGWIT_HRP = "tb"
-        cls.HEADERS_URL = "https://headers.electrum.org/testnet_headers"
         cls.GENESIS = "000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943"
         cls.DEFAULT_PORTS = {'t':'51001', 's':'51002'}
-        cls.DEFAULT_SERVERS = read_json_dict('servers_testnet.json')
+        cls.DEFAULT_SERVERS = read_json('servers_testnet.json', {})
+        cls.CHECKPOINTS = read_json('checkpoints_testnet.json', [])
 
 
 NetworkConstants.set_mainnet()