# Copyright 2021 Agnostiq Inc.
#
# This file is part of Covalent.
#
# Licensed under the Apache License 2.0 (the "License"). A copy of the
# License may be obtained with this software package or at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Use of this file is prohibited except in compliance with the License.
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Class corresponding to computation nodes."""
import inspect
import json
import operator
import tempfile
from builtins import list
from dataclasses import asdict
from functools import wraps
from typing import TYPE_CHECKING, Any, Callable, Dict, Iterable, List, Optional, Union
from covalent._dispatcher_plugins.local import LocalDispatcher
from .._file_transfer.enums import Order
from .._file_transfer.file_transfer import FileTransfer
from .._shared_files import logger
from .._shared_files.context_managers import active_lattice_manager
from .._shared_files.defaults import (
WAIT_EDGE_NAME,
DefaultMetadataValues,
electron_dict_prefix,
electron_list_prefix,
parameter_prefix,
prefix_separator,
sublattice_prefix,
)
from .._shared_files.util_classes import RESULT_STATUS
from .._shared_files.utils import (
filter_null_metadata,
get_named_params,
get_serialized_function_str,
)
from .depsbash import DepsBash
from .depscall import RESERVED_RETVAL_KEY__FILES, DepsCall
from .depspip import DepsPip
from .lattice import Lattice
from .transport import TransportableObject, encode_metadata
consumable_constraints = ["budget", "time_limit"]
DEFAULT_METADATA_VALUES = asdict(DefaultMetadataValues())
if TYPE_CHECKING:
from ..executor import BaseExecutor
from .transport import _TransportGraph
app_log = logger.app_log
log_stack_info = logger.log_stack_info
[docs]class Electron:
"""
An electron (or task) object that is a modular component of a
work flow and is returned by :obj:`electron <covalent.electron>`.
Attributes:
function: Function to be executed.
node_id: Node id of the electron.
metadata: Metadata to be used for the function execution.
kwargs: Keyword arguments if any.
task_group_id: the group to which the task be assigned when it is bound to a graph node. If unset, the group id will default to node id.
packing_tasks: Flag to indicate whether task packing is enabled.
"""
def __init__(
self,
function: Callable,
node_id: int = None,
metadata: dict = None,
task_group_id: int = None,
packing_tasks: bool = False,
) -> None:
if metadata is None:
metadata = {}
self.function = function
self.node_id = node_id
self.metadata = metadata
self.task_group_id = task_group_id
self._packing_tasks = packing_tasks
@property
def packing_tasks(self) -> bool:
return self._packing_tasks
[docs] def get_op_function(
self, operand_1: Union[Any, "Electron"], operand_2: Union[Any, "Electron"], op: str
) -> "Electron":
"""
Function to handle binary operations with electrons as operands.
This will not execute the operation but rather create another electron
which will be postponed to be executed according to the default electron
configuration/metadata.
This also makes sure that if these operations are being performed outside
of a lattice, then they are performed as is.
Args:
operand_1: First operand of the binary operation.
operand_2: Second operand of the binary operation.
op: Operator to be used in the binary operation.
Returns:
electron: Electron object corresponding to the operation execution.
Behaves as a normal function call if outside a lattice.
"""
op_table = {
"+": operator.add,
"-": operator.sub,
"*": operator.mul,
"/": operator.truediv,
"**": operator.pow,
}
def rename(op1: Any, op: str, op2: Any) -> Callable:
"""
Decorator to rename a function according
to the operation being performed.
Args:
op1: First operand
op: Operator
op2: Second operand
Returns:
function: Renamed decorated function.
"""
def decorator(f):
op1_name = op1
if hasattr(op1, "function") and op1.function:
op1_name = op1.function.__name__
op2_name = op2
if hasattr(op2, "function") and op2.function:
op2_name = op2.function.__name__
f.__name__ = f"{op1_name}_{op}_{op2_name}"
return f
return decorator
@rename(operand_1, op, operand_2)
def func_for_op(arg_1: Union[Any, "Electron"], arg_2: Union[Any, "Electron"]) -> Any:
"""
Intermediate function for the binary operation.
Args:
arg_1: First operand
arg_2: Second operand
Returns:
result: Result of the binary operation.
"""
return op_table[op](arg_1, arg_2)
# Mint an arithmetic electron and execute it using the
# enclosing lattice's workflow_executor.
metadata = encode_metadata(DEFAULT_METADATA_VALUES.copy())
executor = metadata["workflow_executor"]
executor_data = metadata["workflow_executor_data"]
op_electron = Electron(func_for_op, metadata=metadata)
if active_lattice := active_lattice_manager.get_active_lattice():
executor = active_lattice.metadata.get(
"workflow_executor", metadata["workflow_executor"]
)
executor_data = active_lattice.metadata.get(
"workflow_executor_data", metadata["workflow_executor_data"]
)
op_electron.metadata["executor"] = executor
op_electron.metadata["executor_data"] = executor_data
return op_electron(arg_1=operand_1, arg_2=operand_2)
def __add__(self, other):
return self.get_op_function(self, other, "+")
def __radd__(self, other):
return self.get_op_function(other, self, "+")
def __sub__(self, other):
return self.get_op_function(self, other, "-")
def __rsub__(self, other):
return self.get_op_function(other, self, "-")
def __mul__(self, other):
return self.get_op_function(self, other, "*")
def __rmul__(self, other):
return self.__mul__(other)
def __truediv__(self, other):
return self.get_op_function(self, other, "/")
def __rtruediv__(self, other):
return self.get_op_function(other, self, "/")
def __pow__(self, other):
return self.get_op_function(self, other, "**")
def __int__(self):
return int()
def __float__(self):
return float()
def __complex__(self):
return complex()
def _get_collection_electron(self, name: str, func: Callable, metadata: Dict) -> "Electron":
"""Get collection electron with task packing enabled.
Args:
name: Name of the collection node.
func: Function to be executed.
Returns:
Electron object with task packing enabled.
"""
active_lattice = active_lattice_manager.get_active_lattice()
return (
Electron(function=func, metadata=self.metadata.copy())
if name.startswith(sublattice_prefix)
else Electron(
function=func,
metadata=metadata,
task_group_id=self.task_group_id,
packing_tasks=True and active_lattice.task_packing,
)
)
def __iter__(self):
last_frame = inspect.currentframe().f_back
bytecode = last_frame.f_code.co_code
expected_unpack_values = bytecode[last_frame.f_lasti + 1]
if expected_unpack_values < 2:
return
for i in range(expected_unpack_values):
if active_lattice := active_lattice_manager.get_active_lattice():
try:
node_name = prefix_separator + self.function.__name__ + "()" + f"[{i}]"
except AttributeError:
# The case when nested iter calls are made on the same electron
node_name = prefix_separator + active_lattice.transport_graph.get_node_value(
self.node_id, "name"
)
node_name += f"[{i}]"
def get_item(e, key):
return e[key]
get_item.__name__ = node_name
iterable_metadata = self.metadata.copy()
filtered_call_before = []
for elem in iterable_metadata["call_before"]:
if elem["attributes"]["retval_keyword"] != "files":
filtered_call_before.append(elem)
iterable_metadata["call_before"] = filtered_call_before
# Pack with main electron unless it is a sublattice.
name = active_lattice.transport_graph.get_node_value(self.node_id, "name")
yield self._get_collection_electron(name, get_item, iterable_metadata)(self, i)
def __getattr__(self, attr: str) -> "Electron":
# This is to handle the cases where magic functions are attempted
# to be accessed. For example, in the case of pickling, sometimes
# __getstate__ is called and we don't want to return an electron
# object in that case.
if attr.startswith("__") and attr.endswith("__"):
return super().__getattr__(attr)
if attr == "keys":
raise AttributeError(
"`keys` attribute should not be used in Electron objects due to conflict with `dict.keys`",
"Please change the name of the attribute you want to use.",
)
if active_lattice := active_lattice_manager.get_active_lattice():
def get_attr(e, attr):
return getattr(e, attr)
get_attr.__name__ = prefix_separator + self.function.__name__ + ".__getattr__"
# Pack with main electron except for sublattices
name = active_lattice.transport_graph.get_node_value(self.node_id, "name")
metadata = self.metadata.copy()
bound_electron = self._get_collection_electron(name, get_attr, metadata)(self, attr)
return bound_electron
return super().__getattr__(attr)
def __getitem__(self, key: Union[int, str]) -> "Electron":
if active_lattice := active_lattice_manager.get_active_lattice():
def get_item(e, key):
return e[key]
get_item.__name__ = prefix_separator + self.function.__name__ + ".__getitem__"
name = active_lattice.transport_graph.get_node_value(self.node_id, "name")
metadata = self.metadata.copy()
return self._get_collection_electron(name, get_item, metadata)(self, key)
raise StopIteration
def __call__(self, *args, **kwargs) -> Union[Any, "Electron"]:
"""
Function to execute the electron.
This behaves differently if the execution call is made inside a lattice
and just adds the electron as a node to the lattice's transport graph.
If the execution call is made outside of a lattice, then it executes the
electron as a normal function call.
Also contains a postprocessing part where the lattice's function is executed
after all the nodes in the lattice's transport graph are executed. Then the
execution call to the electron is replaced by its corresponding result.
Note: Bound electrons are defined as electrons with a valid node_id, since it means they are bound to a TransportGraph.
"""
# Check if inside a lattice and if not, perform a direct invocation of the function
active_lattice = active_lattice_manager.get_active_lattice()
if active_lattice is None:
return self.function(*args, **kwargs)
if active_lattice.post_processing:
output = active_lattice.electron_outputs[0]
active_lattice.electron_outputs.pop(0)
return output
# Setting metadata for default values according to lattice's metadata.
for k in self.metadata:
if (
k not in consumable_constraints
and k in DEFAULT_METADATA_VALUES
and self.get_metadata(k) is None
):
meta = active_lattice.get_metadata(k) or DEFAULT_METADATA_VALUES[k]
self.set_metadata(k, meta)
# Handle replace_electrons for redispatch
name = self.function.__name__
if name in active_lattice.replace_electrons:
# Temporarily pop the replacement to avoid infinite
# recursion.
replacement_electron = active_lattice.replace_electrons.pop(name)
# TODO: check that replacement has the same
# signature. Also, although electron -> sublattice or
# sublattice -> electron are technically possible, these
# replacements will not work with the "exhaustive"
# postprocess method which requires that the number of nodes be
# determined by the lattice inputs.
# This will return a bound replacement electron
bound_electron = replacement_electron(*args, **kwargs)
active_lattice.transport_graph.set_node_value(
bound_electron.node_id,
"status",
RESULT_STATUS.PENDING_REPLACEMENT,
)
active_lattice.replace_electrons[name] = replacement_electron
return bound_electron
# Handle sublattices by injecting _build_sublattice_graph node
if isinstance(self.function, Lattice):
parent_metadata = active_lattice.metadata.copy()
app_log.debug(f"Parent lattice metadata: {parent_metadata}")
e_meta = parent_metadata.copy()
e_meta["executor"] = e_meta.pop("workflow_executor")
e_meta["executor_data"] = e_meta.pop("workflow_executor_data")
sub_electron = Electron(
function=_build_sublattice_graph,
metadata=e_meta,
)
name = sublattice_prefix + self.function.__name__
function_string = get_serialized_function_str(self.function)
bound_electron = sub_electron(
self.function, json.dumps(parent_metadata), *args, **kwargs
)
active_lattice.transport_graph.set_node_value(bound_electron.node_id, "name", name)
active_lattice.transport_graph.set_node_value(
bound_electron.node_id,
"function_string",
function_string,
)
return bound_electron
# Add a node to the transport graph of the active lattice. Electrons bound to nodes will never be packed with the
# 'master' Electron. # Add non-sublattice node to the transport graph of the active lattice.
self.node_id = active_lattice.transport_graph.add_node(
name=self.function.__name__,
function=self.function,
metadata=self.metadata.copy(),
function_string=get_serialized_function_str(self.function),
task_group_id=self.task_group_id if self.packing_tasks else None,
)
self.task_group_id = self.task_group_id if self.packing_tasks else self.node_id
if self.function:
named_args, named_kwargs = get_named_params(self.function, args, kwargs)
# For positional arguments
# We use the fact that as of Python 3.6, dict order == insertion order
for arg_index, item in enumerate(named_args.items()):
key, value = item
self.connect_node_with_others(
self.node_id, key, value, "arg", arg_index, active_lattice.transport_graph
)
# For keyword arguments
# Filter out kwargs to be injected by call_before call_deps during execution.
call_before = self.metadata["call_before"]
retval_keywords = {item["attributes"]["retval_keyword"]: None for item in call_before}
for key, value in named_kwargs.items():
if key in retval_keywords:
app_log.debug(
f"kwarg {key} for function {self.function.__name__} to be injected at runtime"
)
continue
self.connect_node_with_others(
self.node_id, key, value, "kwarg", None, active_lattice.transport_graph
)
bound_electron = Electron(
self.function,
metadata=self.metadata,
node_id=self.node_id,
task_group_id=self.task_group_id,
packing_tasks=self.packing_tasks,
)
active_lattice._bound_electrons[self.node_id] = bound_electron
return bound_electron
[docs] def connect_node_with_others(
self,
node_id: int,
param_name: str,
param_value: Union[Any, "Electron"],
param_type: str,
arg_index: int,
transport_graph: "_TransportGraph",
):
"""
Adds a node along with connecting edges for all the arguments to the electron.
Args:
node_id: Node number of the electron
param_name: Name of the parameter
param_value: Value of the parameter
param_type: Type of parameter, positional or keyword
transport_graph: Transport graph of the lattice
Returns:
None
"""
collection_metadata = encode_metadata(DEFAULT_METADATA_VALUES.copy())
active_lattice = active_lattice_manager.get_active_lattice()
if "executor" in self.metadata:
collection_metadata["executor"] = self.metadata["executor"]
collection_metadata["executor_data"] = self.metadata["executor_data"]
if isinstance(param_value, Electron):
transport_graph.add_edge(
param_value.node_id,
node_id,
edge_name=param_name,
param_type=param_type,
arg_index=arg_index,
)
elif isinstance(param_value, list):
def _auto_list_node(*args, **kwargs):
return list(args)
list_electron = Electron(
function=_auto_list_node,
metadata=collection_metadata,
task_group_id=self.task_group_id,
packing_tasks=True and active_lattice.task_packing,
) # Group the auto-generated node with the main node.
bound_electron = list_electron(*param_value)
transport_graph.set_node_value(bound_electron.node_id, "name", electron_list_prefix)
transport_graph.add_edge(
list_electron.node_id,
node_id,
edge_name=param_name,
param_type=param_type,
arg_index=arg_index,
)
elif isinstance(param_value, dict):
def _auto_dict_node(*args, **kwargs):
return dict(kwargs)
dict_electron = Electron(
function=_auto_dict_node,
metadata=collection_metadata,
task_group_id=self.task_group_id,
packing_tasks=True and active_lattice.task_packing,
) # Group the auto-generated node with the main node.
bound_electron = dict_electron(**param_value)
transport_graph.set_node_value(bound_electron.node_id, "name", electron_dict_prefix)
transport_graph.add_edge(
dict_electron.node_id,
node_id,
edge_name=param_name,
param_type=param_type,
arg_index=arg_index,
)
else:
encoded_param_value = TransportableObject.make_transportable(param_value)
parameter_node = transport_graph.add_node(
name=parameter_prefix + str(param_value),
function=None,
metadata=encode_metadata(DEFAULT_METADATA_VALUES.copy()),
value=encoded_param_value,
output=encoded_param_value,
)
transport_graph.add_edge(
parameter_node,
node_id,
edge_name=param_name,
param_type=param_type,
arg_index=arg_index,
)
[docs] def add_collection_node_to_graph(self, graph: "_TransportGraph", prefix: str) -> int:
"""
Adds the node to lattice's transport graph in the case
where a collection of electrons is passed as an argument
to another electron.
Args:
graph: Transport graph of the lattice
prefix: Prefix of the node
Returns:
node_id: Node id of the added node
"""
new_metadata = encode_metadata(DEFAULT_METADATA_VALUES.copy())
if "executor" in self.metadata:
new_metadata["executor"] = self.metadata["executor"]
new_metadata["executor_data"] = self.metadata["executor_data"]
node_id = graph.add_node(
name=prefix,
function=to_decoded_electron_collection,
metadata=new_metadata,
function_string=get_serialized_function_str(to_decoded_electron_collection),
)
return node_id
[docs] def wait_for(self, electrons: Union["Electron", Iterable["Electron"]]):
"""
Waits for the given electrons to complete before executing this one.
Adds the necessary edges between this and those electrons without explicitly
connecting their inputs/outputs.
Useful when execution of this electron relies on a side-effect from the another one.
Args:
electrons: Electron(s) which will be waited for to complete execution
before starting execution for this one
Returns:
Electron
"""
active_lattice = active_lattice_manager.get_active_lattice()
# Just using list(electrons) will not work since we are overriding the __iter__
# method for an Electron which results in it essentially disappearing, thus using
# [electrons] to create the list if there's a single electron
electrons = [electrons] if isinstance(electrons, Electron) else list(electrons)
for el in electrons:
active_lattice.transport_graph.add_edge(
el.node_id,
self.node_id,
edge_name=WAIT_EDGE_NAME,
)
return Electron(
self.function,
metadata=self.metadata,
node_id=self.node_id,
)
@property
def as_transportable_dict(self) -> Dict:
"""Get transportable electron object and metadata."""
return {
"name": self.function.__name__,
"function": TransportableObject(self.function).to_dict(),
"function_string": get_serialized_function_str(self.function),
"metadata": filter_null_metadata(self.metadata),
}
# Dynamically adding properties to the Electron class
# This is being done this way so that it's easier to add
# or remove properties in the future without having to
# edit the class definition itself.
Electron.executor = property(lambda self: self.get_metadata("executor"))
Electron.executor = Electron.executor.setter(
lambda self, value: self.metadata.update(encode_metadata({"executor": value}))
)
def electron(
_func: Optional[Callable] = None,
*,
backend: Optional[str] = None,
executor: Optional[Union[List[Union[str, "BaseExecutor"]], Union[str, "BaseExecutor"]]] = None,
# Add custom metadata fields here
files: List[FileTransfer] = [],
deps_bash: Union[DepsBash, List, str] = None,
deps_pip: Union[DepsPip, list] = None,
call_before: Union[List[DepsCall], DepsCall] = None,
call_after: Union[List[DepsCall], DepsCall] = None,
) -> Callable: # sourcery skip: assign-if-exp
"""
Electron decorator to be called upon a function. Returns the wrapper function with the same functionality as `_func`.
Args:
_func: function to be decorated
Keyword Args:
backend: DEPRECATED: Same as `executor`.
executor: Alternative executor object to be used by the electron execution. If not passed, the dask
executor is used by default.
deps_bash: An optional DepsBash object specifying a list of shell commands to run before `_func`
deps_pip: An optional DepsPip object specifying a list of PyPI packages to install before running `_func`
call_before: An optional list of DepsCall objects specifying python functions to invoke before the electron
call_after: An optional list of DepsCall objects specifying python functions to invoke after the electron
files: An optional list of FileTransfer objects which copy files to/from remote or local filesystems.
Returns:
:obj:`Electron <covalent._workflow.electron.Electron>` : Electron object inside which the decorated function exists.
"""
if backend:
app_log.warning(
"backend is deprecated and will be removed in a future release. Please use executor keyword instead.",
exc_info=DeprecationWarning,
)
executor = backend
deps = {} if deps_bash or deps_pip else None
if isinstance(deps_bash, DepsBash):
deps["bash"] = deps_bash
if isinstance(deps_bash, (list, str)):
deps["bash"] = DepsBash(commands=deps_bash)
internal_call_before_deps = []
internal_call_after_deps = []
if files:
for file_transfer in files:
_file_transfer_pre_hook_, _file_transfer_call_dep_ = file_transfer.cp()
# pre-file transfer hook to create any necessary temporary files
internal_call_before_deps.append(
DepsCall(
_file_transfer_pre_hook_,
retval_keyword=RESERVED_RETVAL_KEY__FILES,
override_reserved_retval_keys=True,
)
)
if file_transfer.order == Order.AFTER:
internal_call_after_deps.append(DepsCall(_file_transfer_call_dep_))
else:
internal_call_before_deps.append(DepsCall(_file_transfer_call_dep_))
if isinstance(deps_pip, DepsPip):
deps["pip"] = deps_pip
if isinstance(deps_pip, list):
deps["pip"] = DepsPip(packages=deps_pip)
if isinstance(call_before, DepsCall):
call_before = [call_before]
if isinstance(call_after, DepsCall):
call_after = [call_after]
call_before_final = [] if internal_call_before_deps or call_before else None
if internal_call_before_deps:
call_before_final.extend(internal_call_before_deps)
if call_before:
call_before_final.extend(call_before)
call_after_final = [] if internal_call_after_deps or call_after else None
if internal_call_after_deps:
call_after_final.extend(internal_call_after_deps)
if call_after:
call_after_final.extend(call_after)
constraints = {
"executor": executor,
"deps": deps,
"call_before": call_before_final,
"call_after": call_after_final,
}
constraints = encode_metadata(constraints)
def decorator_electron(func=None):
"""
Electron decorator function. Note that the electron_object
defined below is an example of an unbound electron, i.e.
electron without a node id.
"""
electron_object = Electron(func)
for k, v in constraints.items():
electron_object.set_metadata(k, v)
electron_object.__doc__ = func.__doc__
@wraps(func)
def wrapper(*args, **kwargs):
return electron_object(*args, **kwargs)
wrapper.electron_object = electron_object
return wrapper
if _func is None: # decorator is called with arguments
return decorator_electron
else: # decorator is called without arguments
return decorator_electron(_func)
def wait(child, parents):
"""Instructs Covalent that an electron should wait for some other
tasks to complete before it is dispatched.
Args:
child: the dependent electron
parents: Electron(s) which must complete before `waiting_electron` starts
Returns:
waiting_electron
Useful when execution of an electron relies on a side-effect
from another one.
"""
active_lattice = active_lattice_manager.get_active_lattice()
if active_lattice and not active_lattice.post_processing:
return child.wait_for(parents)
else:
return child
@electron
def to_decoded_electron_collection(**x):
"""Interchanges order of serialize -> collection"""
collection = list(x.values())[0]
if isinstance(collection, list):
return TransportableObject.deserialize_list(collection)
elif isinstance(collection, dict):
return TransportableObject.deserialize_dict(collection)
# Copied from runner.py
def _build_sublattice_graph(sub: Lattice, json_parent_metadata: str, *args, **kwargs):
import os
parent_metadata = json.loads(json_parent_metadata)
for k in sub.metadata.keys():
if not sub.metadata[k] and k != "triggers":
sub.metadata[k] = parent_metadata[k]
sub.build_graph(*args, **kwargs)
try:
# Attempt multistage sublattice dispatch. For now we require
# the executor to reach the Covalent server
parent_dispatch_id = os.environ["COVALENT_DISPATCH_ID"]
dispatcher_url = os.environ["COVALENT_DISPATCHER_URL"]
with tempfile.TemporaryDirectory(prefix="covalent-") as staging_path:
manifest = LocalDispatcher.prepare_manifest(sub, staging_path)
# Omit these two steps to return the manifest to Covalent and
# request the assets be pulled
recv_manifest = LocalDispatcher.register_manifest(
manifest,
dispatcher_addr=dispatcher_url,
parent_dispatch_id=parent_dispatch_id,
push_assets=True,
)
LocalDispatcher.upload_assets(recv_manifest)
return recv_manifest.json()
except Exception as ex:
# Fall back to legacy sublattice handling
print("Falling back to legacy sublattice handling")
return sub.serialize_to_json()