def attach(self, laddr: Union[str, Tuple]) -> None:
"""Attaches to an already running RPC client subprocess.
Args:
laddr: Address that the client is listening at. Can be supplied as a
string "http://127.0.0.1:8545" or tuple ("127.0.0.1", 8545)"""
if self.is_active():
raise SystemError("RPC is already active.")
if isinstance(laddr, str):
o = urlparse(laddr)
if not o.port:
raise ValueError("No RPC port given")
laddr = (o.hostname, o.port)
ip = socket.gethostbyname(laddr[0])
resolved_addr = (ip, laddr[1])
pid = self._find_rpc_process_pid(resolved_addr)
print(
f"Attached to local RPC client listening at '{laddr[0]}:{laddr[1]}'..."
)
self.process = psutil.Process(pid)
for key, module in ATTACH_BACKENDS.items():
if web3.clientVersion.lower().startswith(key):
self.backend = module
break
web3.reset_middlewares()
self.backend.on_connection()
chain._network_connected()
def launch(self, cmd: str, **kwargs: Dict) -> None:
if self.is_active():
raise SystemError("RPC is already active.")
for key, module in LAUNCH_BACKENDS.items():
if cmd.lower().startswith(key):
self.backend = module
break
self.process = self.backend.launch(cmd, **kwargs)
# check that web3 can connect
if not web3.provider:
chain._network_disconnected()
return
uri = web3.provider.endpoint_uri if web3.provider else None
for i in range(100):
if web3.isConnected():
web3.reset_middlewares()
self.backend.on_connection()
chain._network_connected()
return
time.sleep(0.1)
if isinstance(self.process, psutil.Popen):
self.process.poll()
if not self.process.is_running():
self.kill(False)
raise RPCProcessError(cmd, uri)
self.kill(False)
raise RPCConnectionError(cmd, self.process, uri)