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agent.py
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import time
import cbor2
from waiter import wait
from .candid import decode, Types
from .identity import *
from .constants import *
from .utils import to_request_id
from .certificate import lookup
def sign_request(req, iden):
req_id = to_request_id(req)
msg = IC_REQUEST_DOMAIN_SEPARATOR + req_id
sig = iden.sign(msg)
envelop = {
'content': req,
'sender_pubkey': sig[0],
'sender_sig': sig[1]
}
return req_id, cbor2.dumps(envelop)
class Agent:
def __init__(self, identity, client, nonce_factory=None, ingress_expiry=300, root_key=IC_ROOT_KEY):
self.identity = identity
self.client = client
self.ingress_expiry = ingress_expiry
self.root_key = root_key
self.nonce_factory = nonce_factory
def get_principal(self):
return self.identity.sender()
def get_expiry_date(self):
return int(time.time() + self.ingress_expiry) * 10**9
def query_endpoint(self, canister_id, data):
ret = self.client.query(canister_id, data)
return cbor2.loads(ret)
async def query_endpoint_async(self, canister_id, data):
ret = await self.client.query_async(canister_id, data)
return cbor2.loads(ret)
def call_endpoint(self, canister_id, request_id, data):
self.client.call(canister_id, request_id, data)
return request_id
async def call_endpoint_async(self, canister_id, request_id, data):
await self.client.call_async(canister_id, request_id, data)
return request_id
def read_state_endpoint(self, canister_id, data):
result = self.client.read_state(canister_id, data)
return result
async def read_state_endpoint_async(self, canister_id, data):
result = await self.client.read_state_async(canister_id, data)
return result
def query_raw(self, canister_id, method_name, arg, return_type = None, effective_canister_id = None):
req = {
'request_type': "query",
'sender': self.identity.sender().bytes,
'canister_id': Principal.from_str(canister_id).bytes if isinstance(canister_id, str) else canister_id.bytes,
'method_name': method_name,
'arg': arg,
'ingress_expiry': self.get_expiry_date()
}
_, data = sign_request(req, self.identity)
result = self.query_endpoint(canister_id if effective_canister_id is None else effective_canister_id, data)
if result['status'] == 'replied':
return decode(result['reply']['arg'], return_type)
elif result['status'] == 'rejected':
return result['reject_message']
async def query_raw_async(self, canister_id, method_name, arg, return_type = None, effective_canister_id = None):
req = {
'request_type': "query",
'sender': self.identity.sender().bytes,
'canister_id': Principal.from_str(canister_id).bytes if isinstance(canister_id, str) else canister_id.bytes,
'method_name': method_name,
'arg': arg,
'ingress_expiry': self.get_expiry_date()
}
_, data = sign_request(req, self.identity)
result = await self.query_endpoint_async(canister_id if effective_canister_id is None else effective_canister_id, data)
if result['status'] == 'replied':
return decode(result['reply']['arg'], return_type)
elif result['status'] == 'rejected':
return result['reject_message']
def update_raw(self, canister_id, method_name, arg, return_type = None, effective_canister_id = None, **kwargs):
req = {
'request_type': "call",
'sender': self.identity.sender().bytes,
'canister_id': Principal.from_str(canister_id).bytes if isinstance(canister_id, str) else canister_id.bytes,
'method_name': method_name,
'arg': arg,
'ingress_expiry': self.get_expiry_date()
}
req_id, data = sign_request(req, self.identity)
eid = canister_id if effective_canister_id is None else effective_canister_id
_ = self.call_endpoint(eid, req_id, data)
# print('update.req_id:', req_id.hex())
status, result = self.poll(eid, req_id, **kwargs)
if status == 'rejected':
raise Exception('Rejected: ' + result.decode())
elif status == 'replied':
return decode(result, return_type)
else:
raise Exception('Timeout to poll result, current status: ' + str(status))
async def update_raw_async(self, canister_id, method_name, arg, return_type = None, effective_canister_id = None, **kwargs):
req = {
'request_type': "call",
'sender': self.identity.sender().bytes,
'canister_id': Principal.from_str(canister_id).bytes if isinstance(canister_id, str) else canister_id.bytes,
'method_name': method_name,
'arg': arg,
'ingress_expiry': self.get_expiry_date()
}
req_id, data = sign_request(req, self.identity)
eid = canister_id if effective_canister_id is None else effective_canister_id
_ = await self.call_endpoint_async(eid, req_id, data)
# print('update.req_id:', req_id.hex())
status, result = await self.poll_async(eid, req_id, **kwargs)
if status == 'rejected':
raise Exception('Rejected: ' + result.decode())
elif status == 'replied':
return decode(result, return_type)
else:
raise Exception('Timeout to poll result, current status: ' + str(status))
def read_state_raw(self, canister_id, paths):
req = {
'request_type': 'read_state',
'sender': self.identity.sender().bytes,
'paths': paths,
'ingress_expiry': self.get_expiry_date(),
}
_, data = sign_request(req, self.identity)
ret = self.read_state_endpoint(canister_id, data)
if ret == b'Invalid path requested.':
raise ValueError('Invalid path requested!')
elif ret == b'Could not parse body as read request: invalid type: byte array, expected a sequence':
raise ValueError('Could not parse body as read request: invalid type: byte array, expected a sequence')
d = cbor2.loads(ret)
cert = cbor2.loads(d['certificate'])
return cert
async def read_state_raw_async(self, canister_id, paths):
req = {
'request_type': 'read_state',
'sender': self.identity.sender().bytes,
'paths': paths,
'ingress_expiry': self.get_expiry_date(),
}
_, data = sign_request(req, self.identity)
ret = await self.read_state_endpoint_async(canister_id, data)
if ret == b'Invalid path requested.':
raise ValueError('Invalid path requested!')
elif ret == b'Could not parse body as read request: invalid type: byte array, expected a sequence':
raise ValueError('Could not parse body as read request: invalid type: byte array, expected a sequence')
d = cbor2.loads(ret)
cert = cbor2.loads(d['certificate'])
return cert
def request_status_raw(self, canister_id, req_id):
paths = [
['request_status'.encode(), req_id],
]
cert = self.read_state_raw(canister_id, paths)
status = lookup(['request_status'.encode(), req_id, 'status'.encode()], cert)
if (status == None):
return status, cert
else:
return status.decode(), cert
async def request_status_raw_async(self, canister_id, req_id):
paths = [
['request_status'.encode(), req_id],
]
cert = await self.read_state_raw_async(canister_id, paths)
status = lookup(['request_status'.encode(), req_id, 'status'.encode()], cert)
if (status == None):
return status, cert
else:
return status.decode(), cert
def poll(self, canister_id, req_id, delay=1, timeout=float('inf')):
status = None
for _ in wait(delay, timeout):
status, cert = self.request_status_raw(canister_id, req_id)
if status == 'replied' or status == 'done' or status == 'rejected':
break
if status == 'replied':
path = ['request_status'.encode(), req_id, 'reply'.encode()]
res = lookup(path, cert)
return status, res
elif status == 'rejected':
path = ['request_status'.encode(), req_id, 'reject_message'.encode()]
msg = lookup(path, cert)
return status, msg
else:
return status, _
async def poll_async(self, canister_id, req_id, delay=1, timeout=float('inf')):
status = None
for _ in wait(delay, timeout):
status, cert = await self.request_status_raw_async(canister_id, req_id)
if status == 'replied' or status == 'done' or status == 'rejected':
break
if status == 'replied':
path = ['request_status'.encode(), req_id, 'reply'.encode()]
res = lookup(path, cert)
return status, res
elif status == 'rejected':
path = ['request_status'.encode(), req_id, 'reject_message'.encode()]
msg = lookup(path, cert)
return status, msg
else:
return status, _