Pyrum ("Py Rumor") is a Python interface to interact with Rumor, an Eth2 networking shell.
This interface maps async Python functions (built on Trio) to Rumor commands.
The mapping is simple:
- A command path is equal to a series of fields
- A command argument is equal to a call argument
- A command flag is equal to a call keyword argument, every
_in the keyword is replaced with-
Some examples:
host listen --tcp=9001
->
peer.listen(tcp=9001)
peer connect /dns4/prylabs.net/tcp/30001/p2p/16Uiu2HAm7Qwe19vz9WzD2Mxn7fXd1vgHHp4iccuyq7TxwRXoAGfc
->
peer.connect('/dns4/prylabs.net/tcp/30001/p2p/16Uiu2HAm7Qwe19vz9WzD2Mxn7fXd1vgHHp4iccuyq7TxwRXoAGfc')
Each of these calls returns a Call object:
- Wait for successful call completion by awaiting the
my_call. - Retrieve latest data from the
my_call.datadict - Individual data can be retrieved by calling
await my_call.some_data_field()to get the respective data as soon as it is available. - If you expect multiple occurrences of the data, you can
awaitmultiple times, or useasync for item in my_call
import trio
from pyrum import WebsocketConn, TCPConn, UnixConn, SubprocessConn, Rumor
from remerkleable.complex import Container
from remerkleable.byte_arrays import Bytes32, Bytes4
from remerkleable.basic import uint64
class StatusReq(Container):
version: Bytes4
finalized_root: Bytes32
finalized_epoch: uint64
head_root: Bytes32
head_slot: uint64
async def basic_rpc_example(rumor: Rumor):
alice = rumor.actor('alice')
await alice.host.start()
# Flags are keyword arguments
await alice.host.listen(tcp=9000)
print("started alice")
# Concurrency in Rumor, planned with async (Trio) in Pyrum
bob = rumor.actor('bob')
await bob.host.start()
await bob.host.listen(tcp=9001)
print("started bob")
long_call = alice.sleep('5s') # sleep 5 seconds
print('made long call')
short_call = alice.sleep('3s') # sleep 3 seconds
print('made short call')
await short_call
print("done with short call")
await long_call
print('done with long call')
# Getting a result should be as easy as calling, and waiting for the key we are after
bob_addr = await bob.host.view().addr()
print('BOB has address: ', bob_addr)
# Command arguments are just call arguments
await alice.peer.connect(bob_addr)
print("connected alice to bob!")
# You can use either await or async-for to get data of a specific key
async for addr in bob.host.view().addr():
print(f'bob has addr: {addr}') # multiple addresses, but the last one matters most.
# Optionally request more peer details
peerdata = await alice.peer.list(details=True).peers()
print(f'alice peer list: {peerdata}')
print("Testing a Status RPC exchange")
alice_peer_id = await alice.host.view().peer_id()
alice_status = StatusReq(head_slot=42)
bob_status = StatusReq(head_slot=123)
async def alice_work(nursery: trio.Nursery) -> Call:
print("alice: listening for status requests")
call = alice.rpc.status.listen(raw=True)
# Wait for inital completion of setup, i.e. the listener is online.
# It will stay open in the background, until `await call.finished()`
await call
async def process_requests():
# Each req object is a dict with all the latest log data at the time of completion of the step.
async for req in call:
print(f"alice: Got request: {req}")
assert 'input_err' not in req
# Or send back an error; await alice.rpc.status.resp.invalid_request(req['req_id'], f"hello! Your request was invalid, because: {req['input_err']}")
assert req['data'] == bob_status.encode_bytes().hex()
resp = alice_status.encode_bytes().hex()
print(f"alice: sending response back to request {req['req_id']}: {resp}")
await alice.rpc.status.resp.chunk.raw(req['req_id'], resp, done=True)
print("alice: stopped listening for status requests")
nursery.start_soon(process_requests)
return call
async def bob_work():
# Send alice a status request
req = bob_status.encode_bytes().hex()
print(f"bob: sending alice ({alice_peer_id}) a status request: {req}")
req_call = bob.rpc.status.req.raw(alice_peer_id, req, raw=True)
await req_call
# Await request to be written to stream
await req_call.next()
# Await first (and only) response chunk
resp = await req_call.next()
print(f"bob: received status response from alice: {resp}")
assert resp['chunk_index'] == 0 # first chunk
assert resp['result_code'] == 0 # success chunk
assert resp['data'] == alice_status.encode_bytes().hex()
# Run tasks in a trio nursery to make them concurrent
async with trio.open_nursery() as nursery:
# Set up alice to listen for requests
alice_listen_call = await alice_work(nursery)
# Make bob send a request and check a response, after alice is set up
await bob_work()
# Close listener of alice
await alice_listen_call.cancel()
async def run_example():
# Websockets
# Start Rumor with websocket serving enabled, then open a connection from rumor:
# rumor serve --ws=localhost:8010 --ws-path=/ws --ws-key=foobar
# async with WebsocketConn(ws_url='ws://localhost:8010/ws', ws_key='foobar') as conn:
# TCP sockets
# rumor serve --tcp localhost:3030
# async with TCPConn(addr='localhost', port=3030) as conn:
# Unix domain sockets
# rumor serve --ipc my_ipc.socket
# async with UnixConn(socket_path='../some/path/my_ipc.socket') as conn:
# Subprocess
# Run it in "bare" mode so there is no shell clutter, and every Rumor output is JSON for Pyrum to parse.
# Optionally specify your own rumor executable, for local development/modding of Rumor
async with SubprocessConn(cmd='cd ../rumor && go run . bare --level=trace') as conn:
# A Trio nursery hosts all the async tasks of the Rumor instance.
async with trio.open_nursery() as nursery:
# And optionally use Rumor(conn, nursery, debug=True) to be super verbose about Rumor communication.
await basic_rpc_example(Rumor(conn, nursery, debug=True))
trio.run(run_example)Example Output:
started alice
started bob
made long call
made short call
done with short call
done with long call
BOB has address: /ip4/127.0.0.1/tcp/9001/p2p/16Uiu2HAm4ZYRU2J9pmsCLnYSfmGEQSsCCAaHD5aXr2MheSUf7egu
connected alice to bob!
bob has addr: /ip4/127.0.0.1/tcp/9001/p2p/16Uiu2HAm4ZYRU2J9pmsCLnYSfmGEQSsCCAaHD5aXr2MheSUf7egu
bob has addr: /ip4/192.168.0.77/tcp/9001/p2p/16Uiu2HAm4ZYRU2J9pmsCLnYSfmGEQSsCCAaHD5aXr2MheSUf7egu
alice peer list: {'16Uiu2HAm4ZYRU2J9pmsCLnYSfmGEQSsCCAaHD5aXr2MheSUf7egu': {'peer_id': '16Uiu2HAm4ZYRU2J9pmsCLnYSfmGEQSsCCAaHD5aXr2MheSUf7egu', 'node_id': '384cbbccd148b82a96138d552e6909225d4169bfaf0b1ea27ccd10e02141187e', 'pubkey': '0287bd489f112f9d43bc04b7c561df3b93d35f1311b6d52df524321b7485e2012e', 'addrs': ['/ip4/127.0.0.1/tcp/9001', '/ip4/192.168.0.77/tcp/9001'], 'protocols': ['/p2p/id/delta/1.0.0', '/ipfs/ping/1.0.0', '/libp2p/circuit/relay/0.1.0', '/ipfs/id/1.0.0', '/ipfs/id/push/1.0.0'], 'user_agent': 'Rumor', 'protocol_version': 'ipfs/0.1.0'}}
Testing a Status RPC exchange
alice: listening for status requests
bob: sending alice (16Uiu2HAm6QTKBBzwpPGt1R8SQHHrUex3czzhd23VnbDkVztwibgD) a status request: 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000007b00000000000000
alice: Got request: {'msg': 'Received request, queued it to respond to!', 'data': '000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000007b00000000000000', 'from': '16Uiu2HAm4ZYRU2J9pmsCLnYSfmGEQSsCCAaHD5aXr2MheSUf7egu', 'protocol': '/eth2/beacon_chain/req/status/1/ssz_snappy', 'req_id': 0}
alice: sending response back to request 0: 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002a00000000000000
bob: received status response from alice: {'msg': 'Received chunk', 'chunk_index': 0, 'chunk_size': 84, 'data': '000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002a00000000000000', 'from': '16Uiu2HAm6QTKBBzwpPGt1R8SQHHrUex3czzhd23VnbDkVztwibgD', 'protocol': '/eth2/beacon_chain/req/status/1/ssz_snappy', 'result_code': 0}
MIT, see LICENSE file.