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interface: refuse to overwrite blockchain of main interface

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in case of conflicting forks
This commit is contained in:
SomberNight
2018-09-19 17:56:42 +02:00
parent 7e1a784fca
commit 9161e8c8f4
2 changed files with 32 additions and 5 deletions
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18
electrum/interface.py
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@@ -503,11 +503,14 @@ class Interface(PrintError):
# is assumed to be expensive; especially as forks below the max
# checkpoint are ignored.
self.print_error("new fork at bad height {}. conflict!!".format(bad))
assert self.blockchain != branch
ismocking = type(branch) is dict
if ismocking:
self.print_error("TODO replace blockchain")
return 'fork_conflict', height
self.print_error('forkpoint conflicts with existing fork', branch.path())
self._raise_if_fork_conflicts_with_default_server(branch)
self._disconnect_from_interfaces_on_conflicting_blockchain(branch)
branch.write(b'', 0)
branch.save_header(bad_header)
self.blockchain = branch
@@ -524,6 +527,21 @@ class Interface(PrintError):
assert b.forkpoint == bad
return 'fork_noconflict', height
def _raise_if_fork_conflicts_with_default_server(self, chain_to_delete: Blockchain) -> None:
main_interface = self.network.interface
if not main_interface: return
if main_interface == self: return
chain_of_default_server = main_interface.blockchain
if not chain_of_default_server: return
if chain_to_delete == chain_of_default_server:
raise GracefulDisconnect('refusing to overwrite blockchain of default server')
def _disconnect_from_interfaces_on_conflicting_blockchain(self, chain: Blockchain) -> None:
ifaces = self.network.disconnect_from_interfaces_on_given_blockchain(chain)
if not ifaces: return
servers = [interface.server for interface in ifaces]
self.print_error("forcing disconnect of other interfaces: {}".format(servers))
async def _search_headers_backwards(self, height, header):
async def iterate():
nonlocal height, header