aiida.engine.processes package¶
Module for processes and related utilities.
-
class
aiida.engine.processes.
ProcessBuilder
(process_class)[source]¶ Bases:
aiida.engine.processes.builder.ProcessBuilderNamespace
A process builder that helps setting up the inputs for creating a new process.
-
__abstractmethods__
= frozenset({})¶
-
__init__
(process_class)[source]¶ Construct a ProcessBuilder instance for the given Process class.
- Parameters
process_class – the Process subclass
-
__module__
= 'aiida.engine.processes.builder'¶
-
_abc_impl
= <_abc_data object>¶
-
property
process_class
¶
-
-
class
aiida.engine.processes.
ProcessBuilderNamespace
(port_namespace)[source]¶ Bases:
collections.abc.MutableMapping
Input namespace for the ProcessBuilder.
Dynamically generates the getters and setters for the input ports of a given PortNamespace
-
__abstractmethods__
= frozenset({})¶
-
__dict__
= mappingproxy({'__module__': 'aiida.engine.processes.builder', '__doc__': 'Input namespace for the `ProcessBuilder`.\n\n Dynamically generates the getters and setters for the input ports of a given PortNamespace\n ', '__init__': <function ProcessBuilderNamespace.__init__>, '__setattr__': <function ProcessBuilderNamespace.__setattr__>, '__repr__': <function ProcessBuilderNamespace.__repr__>, '__dir__': <function ProcessBuilderNamespace.__dir__>, '__iter__': <function ProcessBuilderNamespace.__iter__>, '__len__': <function ProcessBuilderNamespace.__len__>, '__getitem__': <function ProcessBuilderNamespace.__getitem__>, '__setitem__': <function ProcessBuilderNamespace.__setitem__>, '__delitem__': <function ProcessBuilderNamespace.__delitem__>, '_update': <function ProcessBuilderNamespace._update>, '_inputs': <function ProcessBuilderNamespace._inputs>, '_prune': <function ProcessBuilderNamespace._prune>, '__dict__': <attribute '__dict__' of 'ProcessBuilderNamespace' objects>, '__weakref__': <attribute '__weakref__' of 'ProcessBuilderNamespace' objects>, '__abstractmethods__': frozenset(), '_abc_impl': <_abc_data object>})¶
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__init__
(port_namespace)[source]¶ Dynamically construct the get and set properties for the ports of the given port namespace.
For each port in the given port namespace a get and set property will be constructed dynamically and added to the ProcessBuilderNamespace. The docstring for these properties will be defined by calling str() on the Port, which should return the description of the Port.
- Parameters
port_namespace (str) – the inputs PortNamespace for which to construct the builder
-
__module__
= 'aiida.engine.processes.builder'¶
-
__setattr__
(attr, value)[source]¶ Assign the given value to the port with key attr.
Note
Any attributes without a leading underscore being set correspond to inputs and should hence be validated with respect to the corresponding input port from the process spec
- Parameters
attr (str) – attribute
value – value
-
__weakref__
¶ list of weak references to the object (if defined)
-
_abc_impl
= <_abc_data object>¶
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_inputs
(prune=False)[source]¶ Return the entire mapping of inputs specified for this builder.
- Parameters
prune – boolean, when True, will prune nested namespaces that contain no actual values whatsoever
- Returns
mapping of inputs ports and their input values.
-
_prune
(value)[source]¶ Prune a nested mapping from all mappings that are completely empty.
Note
a nested mapping that is completely empty means it contains at most other empty mappings. Other null values, such as None or empty lists, should not be pruned.
- Parameters
value – a nested mapping of port values
- Returns
the same mapping but without any nested namespace that is completely empty.
-
_update
(*args, **kwds)[source]¶ Update the values of the builder namespace passing a mapping as argument or individual keyword value pairs.
The method is prefixed with an underscore in order to not reserve the name for a potential port, but in principle the method functions just as collections.abc.MutableMapping.update.
-
-
class
aiida.engine.processes.
CalcJob
(*args, **kwargs)[source]¶ Bases:
aiida.engine.processes.process.Process
Implementation of the CalcJob process.
-
_Process__called
= True¶
-
__abstractmethods__
= frozenset({})¶
-
__init__
(*args, **kwargs)[source]¶ Construct a CalcJob instance.
Construct the instance only if it is a sub class of CalcJob, otherwise raise InvalidOperation.
See documentation of
aiida.engine.Process
.
-
__module__
= 'aiida.engine.processes.calcjobs.calcjob'¶
-
_abc_impl
= <_abc_data object>¶
-
_node_class
¶ alias of
aiida.orm.nodes.process.calculation.calcjob.CalcJobNode
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_spec
= <aiida.engine.processes.process_spec.CalcJobProcessSpec object>¶
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_spec_class
¶ alias of
aiida.engine.processes.process_spec.CalcJobProcessSpec
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link_label_retrieved
= 'retrieved'¶
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on_terminated
()[source]¶ Cleanup the node by deleting the calulation job state.
Note
This has to be done before calling the super because that will seal the node after we cannot change it
-
property
options
¶ Return the options of the metadata that were specified when this process instance was launched.
- Returns
options dictionary
- Return type
-
parse
(retrieved_temporary_folder=None)[source]¶ Parse a retrieved job calculation.
This is called once it’s finished waiting for the calculation to be finished and the data has been retrieved.
-
presubmit
(folder)[source]¶ Prepares the calculation folder with all inputs, ready to be copied to the cluster.
- Parameters
folder (
aiida.common.folders.Folder
) – a SandboxFolder that can be used to write calculation input files and the scheduling script.- Return calcinfo
the CalcInfo object containing the information needed by the daemon to handle operations.
- Rtype calcinfo
-
run
()[source]¶ Run the calculation job.
This means invoking the presubmit and storing the temporary folder in the node’s repository. Then we move the process in the Wait state, waiting for the UPLOAD transport task to be started.
-
spec_options
= <aiida.engine.processes.ports.PortNamespace object>¶
-
-
class
aiida.engine.processes.
ExitCode
[source]¶ Bases:
aiida.engine.processes.exit_code.ExitCode
A simple data class to define an exit code for a
Process
.When an instance of this clas is returned from a Process._run() call, it will be interpreted that the Process should be terminated and that the exit status and message of the namedtuple should be set to the corresponding attributes of the node.
Note
this class explicitly sub-classes a namedtuple to not break backwards compatibility and to have it behave exactly as a tuple.
- Parameters
-
__dict__
= mappingproxy({'__module__': 'aiida.engine.processes.exit_code', '__doc__': 'A simple data class to define an exit code for a :class:`~aiida.engine.processes.process.Process`.\n\n When an instance of this clas is returned from a `Process._run()` call, it will be interpreted that the `Process`\n should be terminated and that the exit status and message of the namedtuple should be set to the corresponding\n attributes of the node.\n\n .. note:: this class explicitly sub-classes a namedtuple to not break backwards compatibility and to have it behave\n exactly as a tuple.\n\n :param status: positive integer exit status, where a non-zero value indicated the process failed, default is `0`\n :type status: int\n\n :param message: optional message with more details about the failure mode\n :type message: str\n\n :param invalidates_cache: optional flag, indicating that a process should not be used in caching\n :type invalidates_cache: bool\n ', 'format': <function ExitCode.format>, '__dict__': <attribute '__dict__' of 'ExitCode' objects>})¶
-
__module__
= 'aiida.engine.processes.exit_code'¶
-
class
aiida.engine.processes.
ExitCodesNamespace
(dictionary=None)[source]¶ Bases:
aiida.common.extendeddicts.AttributeDict
A namespace of ExitCode instances that can be accessed through getattr as well as getitem.
Additionally, the collection can be called with an identifier, that can either reference the integer status of the ExitCode that needs to be retrieved or the key in the collection.
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__call__
(identifier)[source]¶ Return a specific exit code identified by either its exit status or label.
- Parameters
identifier (str) – the identifier of the exit code. If the type is integer, it will be interpreted as the exit code status, otherwise it be interpreted as the exit code label
- Returns
an ExitCode instance
- Return type
- Raises
ValueError – if no exit code with the given label is defined for this process
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__module__
= 'aiida.engine.processes.exit_code'¶
-
-
aiida.engine.processes.
calcfunction
(function)[source]¶ A decorator to turn a standard python function into a calcfunction. Example usage:
>>> from aiida.orm import Int >>> >>> # Define the calcfunction >>> @calcfunction >>> def sum(a, b): >>> return a + b >>> # Run it with some input >>> r = sum(Int(4), Int(5)) >>> print(r) 9 >>> r.get_incoming().all() [Neighbor(link_type='', link_label='result', node=<CalcFunctionNode: uuid: ce0c63b3-1c84-4bb8-ba64-7b70a36adf34 (pk: 3567)>)] >>> r.get_incoming().get_node_by_label('result').get_incoming().all_nodes() [4, 5]
- Parameters
function (callable) – The function to decorate.
- Returns
The decorated function.
- Return type
callable
-
aiida.engine.processes.
workfunction
(function)[source]¶ A decorator to turn a standard python function into a workfunction. Example usage:
>>> from aiida.orm import Int >>> >>> # Define the workfunction >>> @workfunction >>> def select(a, b): >>> return a >>> # Run it with some input >>> r = select(Int(4), Int(5)) >>> print(r) 4 >>> r.get_incoming().all() [Neighbor(link_type='', link_label='result', node=<WorkFunctionNode: uuid: ce0c63b3-1c84-4bb8-ba64-7b70a36adf34 (pk: 3567)>)] >>> r.get_incoming().get_node_by_label('result').get_incoming().all_nodes() [4, 5]
- Parameters
function (callable) – The function to decorate.
- Returns
The decorated function.
- Return type
callable
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class
aiida.engine.processes.
FunctionProcess
(*args, **kwargs)[source]¶ Bases:
aiida.engine.processes.process.Process
Function process class used for turning functions into a Process
-
_Process__called
= True¶
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__abstractmethods__
= frozenset({})¶
-
__init__
(*args, **kwargs)[source]¶ Process constructor.
- Parameters
inputs (dict) – process inputs
logger (
logging.Logger
) – aiida loggerrunner – process runner
parent_pid (int) – id of parent process
enable_persistence (bool) – whether to persist this process
- Type
-
__module__
= 'aiida.engine.processes.functions'¶
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_abc_impl
= <_abc_data object>¶
-
static
_func
(*_args, **_kwargs)[source]¶ This is used internally to store the actual function that is being wrapped and will be replaced by the build method.
-
_func_args
= None¶
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_spec
= <aiida.engine.processes.process_spec.ProcessSpec object>¶
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classmethod
args_to_dict
(*args)[source]¶ Create an input dictionary (of form label -> value) from supplied args.
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static
build
(func, node_class)[source]¶ Build a Process from the given function.
All function arguments will be assigned as process inputs. If keyword arguments are specified then these will also become inputs.
- Parameters
func (callable) – The function to build a process from
node_class (
aiida.orm.nodes.process.process.ProcessNode
) – Provide a custom node class to be used, has to be constructable with no arguments. It has to be a sub class of ProcessNode and the mixinFunctionCalculationMixin
.
- Returns
A Process class that represents the function
- Return type
-
classmethod
create_inputs
(*args, **kwargs)[source]¶ Create the input args for the FunctionProcess.
- Return type
-
classmethod
get_or_create_db_record
()[source]¶ Create a process node that represents what happened in this process.
- Returns
A process node
- Return type
-
property
process_class
¶ Return the class that represents this Process, for the FunctionProcess this is the function itself.
For a standard Process or sub class of Process, this is the class itself. However, for legacy reasons, the Process class is a wrapper around another class. This function returns that original class, i.e. the class that really represents what was being executed.
- Returns
A Process class that represents the function
- Return type
-
-
class
aiida.engine.processes.
PortNamespace
(*args, **kwargs)[source]¶ Bases:
aiida.engine.processes.ports.WithNonDb
,plumpy.ports.PortNamespace
Sub class of plumpy.PortNamespace which implements the serialize method to support automatic recursive serialization of a given mapping onto the ports of the PortNamespace.
-
__abstractmethods__
= frozenset({})¶
-
__module__
= 'aiida.engine.processes.ports'¶
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__setitem__
(key, port)[source]¶ Ensure that a Port being added inherits the non_db attribute if not explicitly defined at construction.
The reasoning is that if a PortNamespace has non_db=True, which is different from the default value, very often all leaves should be also non_db=True. To prevent a user from having to specify it manually everytime we overload the value here, unless it was specifically set during construction.
Note that the non_db attribute is not present for all Port sub classes so we have to check for it first.
-
_abc_impl
= <_abc_data object>¶
-
serialize
(mapping, breadcrumbs=())[source]¶ Serialize the given mapping onto this Portnamespace.
It will recursively call this function on any nested PortNamespace or the serialize function on any Ports.
- Parameters
mapping – a mapping of values to be serialized
breadcrumbs – a tuple with the namespaces of parent namespaces
- Returns
the serialized mapping
-
static
validate_port_name
(port_name)[source]¶ Validate the given port name.
Valid port names adhere to the following restrictions:
Is a valid link label (see below)
Does not contain two or more consecutive underscores
Valid link labels adhere to the following restrictions:
Has to be a valid python identifier
Can only contain alphanumeric characters and underscores
Can not start or end with an underscore
- Parameters
port_name – the proposed name of the port to be added
- Raises
TypeError – if the port name is not a string type
ValueError – if the port name is invalid
-
-
class
aiida.engine.processes.
InputPort
(*args, **kwargs)[source]¶ Bases:
aiida.engine.processes.ports.WithSerialize
,aiida.engine.processes.ports.WithNonDb
,plumpy.ports.InputPort
Sub class of plumpy.InputPort which mixes in the WithSerialize and WithNonDb mixins to support automatic value serialization to database storable types and support non database storable input types as well.
-
__abstractmethods__
= frozenset({})¶
-
__init__
(*args, **kwargs)[source]¶ Override the constructor to check the type of the default if set and warn if not immutable.
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__module__
= 'aiida.engine.processes.ports'¶
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_abc_impl
= <_abc_data object>¶
-
-
class
aiida.engine.processes.
OutputPort
(name, valid_type=None, help=None, required=True, validator=None)[source]¶ Bases:
plumpy.ports.Port
-
__abstractmethods__
= frozenset({})¶
-
__module__
= 'plumpy.ports'¶
-
_abc_impl
= <_abc_data object>¶
-
-
class
aiida.engine.processes.
CalcJobOutputPort
(*args, **kwargs)[source]¶ Bases:
plumpy.ports.OutputPort
Sub class of plumpy.OutputPort which adds the _pass_to_parser attribute.
-
__abstractmethods__
= frozenset({})¶
-
__module__
= 'aiida.engine.processes.ports'¶
-
_abc_impl
= <_abc_data object>¶
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property
pass_to_parser
¶
-
-
class
aiida.engine.processes.
WithNonDb
(*args, **kwargs)[source]¶ Bases:
object
A mixin that adds support to a port to flag a that should not be stored in the database using the non_db=True flag.
The mixins have to go before the main port class in the superclass order to make sure the mixin has the chance to strip out the non_db keyword.
-
__dict__
= mappingproxy({'__module__': 'aiida.engine.processes.ports', '__doc__': '\n A mixin that adds support to a port to flag a that should not be stored\n in the database using the non_db=True flag.\n\n The mixins have to go before the main port class in the superclass order\n to make sure the mixin has the chance to strip out the non_db keyword.\n ', '__init__': <function WithNonDb.__init__>, 'non_db_explicitly_set': <property object>, 'non_db': <property object>, '__dict__': <attribute '__dict__' of 'WithNonDb' objects>, '__weakref__': <attribute '__weakref__' of 'WithNonDb' objects>})¶
-
__module__
= 'aiida.engine.processes.ports'¶
-
__weakref__
¶ list of weak references to the object (if defined)
-
property
non_db
¶ Return whether the value of this Port should be stored as a Node in the database.
- Returns
boolean, True if it should be storable as a Node, False otherwise
-
property
non_db_explicitly_set
¶ Return whether the a value for non_db was explicitly passed in the construction of the Port.
- Returns
boolean, True if non_db was explicitly defined during construction, False otherwise
-
-
class
aiida.engine.processes.
WithSerialize
(*args, **kwargs)[source]¶ Bases:
object
A mixin that adds support for a serialization function which is automatically applied on inputs that are not AiiDA data types.
-
__dict__
= mappingproxy({'__module__': 'aiida.engine.processes.ports', '__doc__': '\n A mixin that adds support for a serialization function which is automatically applied on inputs\n that are not AiiDA data types.\n ', '__init__': <function WithSerialize.__init__>, 'serialize': <function WithSerialize.serialize>, '__dict__': <attribute '__dict__' of 'WithSerialize' objects>, '__weakref__': <attribute '__weakref__' of 'WithSerialize' objects>})¶
-
__module__
= 'aiida.engine.processes.ports'¶
-
__weakref__
¶ list of weak references to the object (if defined)
-
-
class
aiida.engine.processes.
Process
(inputs=None, logger=None, runner=None, parent_pid=None, enable_persistence=True)[source]¶ Bases:
plumpy.processes.Process
This class represents an AiiDA process which can be executed and will have full provenance saved in the database.
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SINGLE_OUTPUT_LINKNAME
= 'result'¶
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class
SaveKeys
[source]¶ Bases:
enum.Enum
Keys used to identify things in the saved instance state bundle.
-
CALC_ID
= 'calc_id'¶
-
__module__
= 'aiida.engine.processes.process'¶
-
-
_Process__called
= True¶
-
__abstractmethods__
= frozenset({})¶
-
__init__
(inputs=None, logger=None, runner=None, parent_pid=None, enable_persistence=True)[source]¶ Process constructor.
- Parameters
inputs (dict) – process inputs
logger (
logging.Logger
) – aiida loggerrunner – process runner
parent_pid (int) – id of parent process
enable_persistence (bool) – whether to persist this process
- Type
-
__module__
= 'aiida.engine.processes.process'¶
-
_abc_impl
= <_abc_data object>¶
-
_auto_persist
= {'_CREATION_TIME', '_enable_persistence', '_future', '_parent_pid', '_paused', '_pid', '_pre_paused_status', '_status'}¶
-
_create_and_setup_db_record
()[source]¶ Create and setup the database record for this process
- Returns
the uuid of the process
- Return type
uuid.UUID
-
_flat_inputs
()[source]¶ Return a flattened version of the parsed inputs dictionary.
The eventual keys will be a concatenation of the nested keys. Note that the metadata dictionary, if present, is not passed, as those are dealt with separately in _setup_metadata.
- Returns
flat dictionary of parsed inputs
- Return type
-
_flat_outputs
()[source]¶ Return a flattened version of the registered outputs dictionary.
The eventual keys will be a concatenation of the nested keys.
- Returns
flat dictionary of parsed outputs
-
_flatten_inputs
(port, port_value, parent_name='', separator='__')[source]¶ Function that will recursively flatten the inputs dictionary, omitting inputs for ports that are marked as being non database storable
- Parameters
port (
plumpy.ports.Port
) – port against which to map the port value, can be InputPort or PortNamespaceport_value – value for the current port, can be a Mapping
parent_name (str) – the parent key with which to prefix the keys
separator (str) – character to use for the concatenation of keys
- Returns
flat list of inputs
- Return type
-
_flatten_outputs
(port, port_value, parent_name='', separator='__')[source]¶ Function that will recursively flatten the outputs dictionary.
- Parameters
port (
plumpy.ports.Port
) – port against which to map the port value, can be OutputPort or PortNamespaceport_value – value for the current port, can be a Mapping
parent_name (str) – the parent key with which to prefix the keys
separator (str) – character to use for the concatenation of keys
- Returns
flat list of outputs
- Return type
-
static
_get_namespace_list
(namespace=None, agglomerate=True)[source]¶ Get the list of namespaces in a given namespace.
-
_node_class
¶
-
_save_checkpoint
()[source]¶ Save the current state in a chechpoint if persistence is enabled and the process state is not terminal
If the persistence call excepts with a PersistenceError, it will be caught and a warning will be logged.
-
_setup_db_record
()[source]¶ Create the database record for this process and the links with respect to its inputs
This function will set various attributes on the node that serve as a proxy for attributes of the Process. This is essential as otherwise this information could only be introspected through the Process itself, which is only available to the interpreter that has it in memory. To make this data introspectable from any interpreter, for example for the command line interface, certain Process attributes are proxied through the calculation node.
In addition, the parent calculation will be setup with a CALL link if applicable and all inputs will be linked up as well.
-
_setup_inputs
()[source]¶ Create the links between the input nodes and the ProcessNode that represents this process.
-
_spec
= <aiida.engine.processes.process_spec.ProcessSpec object>¶
-
_spec_class
¶
-
classmethod
build_process_type
()[source]¶ The process type.
- Returns
string of the process type
- Return type
Note: This could be made into a property ‘process_type’ but in order to have it be a property of the class it would need to be defined in the metaclass, see https://bugs.python.org/issue20659
-
decode_input_args
(encoded)[source]¶ Decode saved input arguments as they came from the saved instance state Bundle
- Parameters
encoded – encoded (serialized) inputs
- Returns
The decoded input args
-
encode_input_args
(inputs)[source]¶ Encode input arguments such that they may be saved in a Bundle
- Parameters
inputs – A mapping of the inputs as passed to the process
- Returns
The encoded (serialized) inputs
-
exit_codes
= {'ERROR_INVALID_OUTPUT': ExitCode(status=10, message='The process returned an invalid output.', invalidates_cache=False), 'ERROR_LEGACY_FAILURE': ExitCode(status=2, message='The process failed with legacy failure mode.', invalidates_cache=False), 'ERROR_MISSING_OUTPUT': ExitCode(status=11, message='The process did not register a required output.', invalidates_cache=False), 'ERROR_UNSPECIFIED': ExitCode(status=1, message='The process has failed with an unspecified error.', invalidates_cache=False)}¶
-
exposed_inputs
(process_class, namespace=None, agglomerate=True)[source]¶ Gather a dictionary of the inputs that were exposed for a given Process class under an optional namespace.
- Parameters
process_class (
aiida.engine.Process
) – Process class whose inputs to try and retrievenamespace (str) – PortNamespace in which to look for the inputs
agglomerate (bool) – If set to true, all parent namespaces of the given
namespace
will also be searched for inputs. Inputs in lower-lying namespaces take precedence.
- Returns
exposed inputs
- Return type
-
exposed_outputs
(node, process_class, namespace=None, agglomerate=True)[source]¶ Return the outputs which were exposed from the
process_class
and emitted by the specificnode
- Parameters
node (
aiida.orm.nodes.process.ProcessNode
) – process node whose outputs to try and retrievenamespace (str) – Namespace in which to search for exposed outputs.
agglomerate (bool) – If set to true, all parent namespaces of the given
namespace
will also be searched for outputs. Outputs in lower-lying namespaces take precedence.
- Returns
exposed outputs
- Return type
-
classmethod
get_exit_statuses
(exit_code_labels)[source]¶ Return the exit status (integers) for the given exit code labels.
- Parameters
exit_code_labels – a list of strings that reference exit code labels of this process class
- Returns
list of exit status integers that correspond to the given exit code labels
- Raises
AttributeError – if at least one of the labels does not correspond to an existing exit code
-
classmethod
get_or_create_db_record
()[source]¶ Create a process node that represents what happened in this process.
- Returns
A process node
- Return type
-
get_parent_calc
()[source]¶ Get the parent process node
- Returns
the parent process node if there is one
- Return type
-
classmethod
is_valid_cache
(node)[source]¶ Check if the given node can be cached from.
Warning
When overriding this method, make sure to call super().is_valid_cache(node) and respect its output. Otherwise, the ‘invalidates_cache’ keyword on exit codes will not work.
This method allows extending the behavior of ProcessNode.is_valid_cache from Process sub-classes, for example in plug-ins.
-
load_instance_state
(saved_state, load_context)[source]¶ Load instance state.
- Parameters
saved_state – saved instance state
load_context (
plumpy.persistence.LoadSaveContext
) –
-
property
metadata
¶ Return the metadata that were specified when this process instance was launched.
- Returns
metadata dictionary
- Return type
-
property
node
¶ Return the ProcessNode used by this process to represent itself in the database.
- Returns
instance of sub class of ProcessNode
- Return type
-
on_except
(exc_info)[source]¶ Log the exception by calling the report method with formatted stack trace from exception info object and store the exception string as a node attribute
- Parameters
exc_info – the sys.exc_info() object (type, value, traceback)
-
on_finish
(result, successful)[source]¶ Set the finish status on the process node.
- Parameters
result (int or
aiida.engine.ExitCode
) – result of the processsuccessful (bool) – whether execution was successful
-
on_output_emitting
(output_port, value)[source]¶ The process has emitted a value on the given output port.
- Parameters
output_port (str) – The output port name the value was emitted on
value – The value emitted
-
on_paused
(msg=None)[source]¶ The Process was paused so set the paused attribute on the process node
- Parameters
msg (str) – message
-
out
(output_port, value=None)[source]¶ Attach output to output port.
The name of the port will be used as the link label.
- Parameters
output_port (str) – name of output port
value – value to put inside output port
-
out_many
(out_dict)[source]¶ Attach outputs to multiple output ports.
Keys of the dictionary will be used as output port names, values as outputs.
- Parameters
out_dict (dict) – output dictionary
-
report
(msg, *args, **kwargs)[source]¶ Log a message to the logger, which should get saved to the database through the attached DbLogHandler.
The pk, class name and function name of the caller are prepended to the given message
-
property
runner
¶ Get process runner.
- Return type
-
save_instance_state
(out_state, save_context)[source]¶ Save instance state.
See documentation of
plumpy.processes.Process.save_instance_state()
.
-
set_status
(status)[source]¶ The status of the Process is about to be changed, so we reflect this is in node’s attribute proxy.
- Parameters
status (str) – the status message
-
spec_metadata
= <aiida.engine.processes.ports.PortNamespace object>¶
-
submit
(process, *args, **kwargs)[source]¶ Submit process for execution.
- Parameters
process (
aiida.engine.Process
) – process
-
update_outputs
()[source]¶ Attach new outputs to the node since the last call.
Does nothing, if self.metadata.store_provenance is False.
-
property
uuid
¶ Return the UUID of the process which corresponds to the UUID of its associated ProcessNode.
- Returns
the UUID associated to this process instance
-
-
class
aiida.engine.processes.
ProcessState
[source]¶ Bases:
enum.Enum
The possible states that a
Process
can be in.-
CREATED
= 'created'¶
-
EXCEPTED
= 'excepted'¶
-
FINISHED
= 'finished'¶
-
KILLED
= 'killed'¶
-
RUNNING
= 'running'¶
-
WAITING
= 'waiting'¶
-
__module__
= 'plumpy.process_states'¶
-
-
aiida.engine.processes.
ToContext
¶ alias of
builtins.dict
-
aiida.engine.processes.
assign_
(target)[source]¶ Convenience function that will construct an Awaitable for a given class instance with the context action set to ASSIGN. When the awaitable target is completed it will be assigned to the context for a key that is to be defined later
- Parameters
target – an instance of a Process or Awaitable
- Returns
the awaitable
- Return type
-
aiida.engine.processes.
append_
(target)[source]¶ Convenience function that will construct an Awaitable for a given class instance with the context action set to APPEND. When the awaitable target is completed it will be appended to a list in the context for a key that is to be defined later
- Parameters
target – an instance of a Process or Awaitable
- Returns
the awaitable
- Return type
-
class
aiida.engine.processes.
BaseRestartWorkChain
(*args, **kwargs)[source]¶ Bases:
aiida.engine.processes.workchains.workchain.WorkChain
Base restart work chain.
This work chain serves as the starting point for more complex work chains that will be designed to run a sub process that might need multiple restarts to come to a successful end. These restarts may be necessary because a single process run is not sufficient to achieve a fully converged result, or certain errors maybe encountered which are recoverable.
This work chain implements the most basic functionality to achieve this goal. It will launch the sub process, restarting until it is completed successfully or the maximum number of iterations is reached. After completion of the sub process it will be inspected, and a list of process handlers are called successively. These process handlers are defined as class methods that are decorated with
process_handler()
.The idea is to sub class this work chain and leverage the generic error handling that is implemented in the few outline methods. The minimally required outline would look something like the following:
cls.setup while_(cls.should_run_process)( cls.run_process, cls.inspect_process, )
Each of these methods can of course be overriden but they should be general enough to fit most process cycles. The run_process method will take the inputs for the process from the context under the key inputs. The user should, therefore, make sure that before the run_process method is called, that the to be used inputs are stored under self.ctx.inputs. One can update the inputs based on the results from a prior process by calling an outline method just before the run_process step, for example:
cls.setup while_(cls.should_run_process)( cls.prepare_inputs, cls.run_process, cls.inspect_process, )
Where in the prepare_calculation method, the inputs dictionary at self.ctx.inputs is updated before the next process will be run with those inputs.
The _process_class attribute should be set to the Process class that should be run in the loop. Finally, to define handlers that will be called during the inspect_process simply define a class method with the signature (self, node) and decorate it with the process_handler decorator, for example:
@process_handler def handle_problem(self, node): if some_problem: self.ctx.inputs = improved_inputs return ProcessHandlerReport()
The process_handler and ProcessHandlerReport support various arguments to control the flow of the logic of the inspect_process. Refer to their respective documentation for details.
-
_Process__called
= True¶
-
__abstractmethods__
= frozenset({})¶
-
__module__
= 'aiida.engine.processes.workchains.restart'¶
-
_abc_impl
= <_abc_data object>¶
-
_considered_handlers_extra
= 'considered_handlers'¶
-
_process_class
= None¶
-
_spec
= <aiida.engine.processes.workchains.workchain.WorkChainSpec object>¶
-
_wrap_bare_dict_inputs
(port_namespace, inputs)[source]¶ Wrap bare dictionaries in inputs in a Dict node if dictated by the corresponding inputs portnamespace.
- Parameters
port_namespace – a PortNamespace
inputs – a dictionary of inputs intended for submission of the process
- Returns
an attribute dictionary with all bare dictionaries wrapped in Dict if dictated by the port namespace
-
inspect_process
()[source]¶ Analyse the results of the previous process and call the handlers when necessary.
If the process is excepted or killed, the work chain will abort. Otherwise any attached handlers will be called in order of their specified priority. If the process was failed and no handler returns a report indicating that the error was handled, it is considered an unhandled process failure and the process is relaunched. If this happens twice in a row, the work chain is aborted. In the case that at least one handler returned a report the following matrix determines the logic that is followed:
Process Handler Handler Action result report? exit code —————————————– Success yes == 0 Restart Success yes != 0 Abort Failed yes == 0 Restart Failed yes != 0 Abort
If no handler returned a report and the process finished successfully, the work chain’s work is considered done and it will move on to the next step that directly follows the while conditional, if there is one defined in the outline.
-
classmethod
is_process_handler
(process_handler_name)[source]¶ Return whether the given method name corresponds to a process handler of this class.
- Parameters
process_handler_name – string name of the instance method
- Returns
boolean, True if corresponds to process handler, False otherwise
-
on_terminated
()[source]¶ Clean the working directories of all child calculation jobs if clean_workdir=True in the inputs.
-
results
()[source]¶ Attach the outputs specified in the output specification from the last completed process.
-
run_process
()[source]¶ Run the next process, taking the input dictionary from the context at self.ctx.inputs.
-
-
class
aiida.engine.processes.
ProcessHandlerReport
(do_break, exit_code)¶ Bases:
tuple
-
__getnewargs__
()¶ Return self as a plain tuple. Used by copy and pickle.
-
__module__
= 'aiida.engine.processes.workchains.utils'¶
-
static
__new__
(_cls, do_break=False, exit_code=ExitCode(status=0, message=None, invalidates_cache=False))¶ Create new instance of ProcessHandlerReport(do_break, exit_code)
-
__repr__
()¶ Return a nicely formatted representation string
-
__slots__
= ()¶
-
_asdict
()¶ Return a new OrderedDict which maps field names to their values.
-
_fields
= ('do_break', 'exit_code')¶
-
_fields_defaults
= {}¶
-
classmethod
_make
(iterable)¶ Make a new ProcessHandlerReport object from a sequence or iterable
-
_replace
(**kwds)¶ Return a new ProcessHandlerReport object replacing specified fields with new values
-
property
do_break
¶ Alias for field number 0
-
property
exit_code
¶ Alias for field number 1
-
-
aiida.engine.processes.
process_handler
(wrapped=None, *, priority=0, exit_codes=None, enabled=True)[source]¶ Decorator to register a
BaseRestartWorkChain
instance method as a process handler.The decorator will validate the priority and exit_codes optional keyword arguments and then add itself as an attribute to the wrapped instance method. This is used in the inspect_process to return all instance methods of the class that have been decorated by this function and therefore are considered to be process handlers.
Requirements on the function signature of process handling functions. The function to which the decorator is applied needs to take two arguments:
self: This is the instance of the work chain itself
node: This is the process node that finished and is to be investigated
The function body typically consists of a conditional that will check for a particular problem that might have occurred for the sub process. If a particular problem is handled, the process handler should return an instance of the
aiida.engine.ProcessHandlerReport
tuple. If no other process handlers should be considered, the set do_break attribute should be set to True. If the work chain is to be aborted entirely, the exit_code of the report can be set to an ExitCode instance with a non-zero status.- Parameters
cls – the work chain class to register the process handler with
priority – optional integer that defines the order in which registered handlers will be called during the handling of a finished process. Higher priorities will be handled first. Default value is 0. Multiple handlers with the same priority is allowed, but the order of those is not well defined.
exit_codes – single or list of ExitCode instances. If defined, the handler will return None if the exit code set on the node does not appear in the exit_codes. This is useful to have a handler called only when the process failed with a specific exit code.
enabled – boolean, by default True, which will cause the handler to be called during inspect_process. When set to False, the handler will be skipped. This static value can be overridden on a per work chain instance basis through the input handler_overrides.
-
class
aiida.engine.processes.
WorkChain
(inputs=None, logger=None, runner=None, enable_persistence=True)[source]¶ Bases:
aiida.engine.processes.process.Process
The WorkChain class is the principle component to implement workflows in AiiDA.
-
_CONTEXT
= 'CONTEXT'¶
-
_Process__called
= True¶
-
_STEPPER_STATE
= 'stepper_state'¶
-
__abstractmethods__
= frozenset({})¶
-
__init__
(inputs=None, logger=None, runner=None, enable_persistence=True)[source]¶ Construct a WorkChain instance.
Construct the instance only if it is a sub class of WorkChain, otherwise raise InvalidOperation.
- Parameters
inputs (dict) – work chain inputs
logger (
logging.Logger
) – aiida loggerrunner – work chain runner
enable_persistence (bool) – whether to persist this work chain
- Type
-
__module__
= 'aiida.engine.processes.workchains.workchain'¶
-
_abc_impl
= <_abc_data object>¶
-
_auto_persist
= {'_CREATION_TIME', '_awaitables', '_enable_persistence', '_future', '_parent_pid', '_paused', '_pid', '_pre_paused_status', '_status'}¶
-
_do_step
()[source]¶ Execute the next step in the outline and return the result.
If the stepper returns a non-finished status and the return value is of type ToContext, the contents of the ToContext container will be turned into awaitables if necessary. If any awaitables were created, the process will enter in the Wait state, otherwise it will go to Continue. When the stepper returns that it is done, the stepper result will be converted to None and returned, unless it is an integer or instance of ExitCode.
-
_node_class
¶ alias of
aiida.orm.nodes.process.workflow.workchain.WorkChainNode
-
_spec
= <aiida.engine.processes.workchains.workchain.WorkChainSpec object>¶
-
_spec_class
¶ alias of
WorkChainSpec
-
_store_nodes
(data)[source]¶ Recurse through a data structure and store any unstored nodes that are found along the way
- Parameters
data – a data structure potentially containing unstored nodes
-
_update_process_status
()[source]¶ Set the process status with a message accounting the current sub processes that we are waiting for.
-
action_awaitables
()[source]¶ Handle the awaitables that are currently registered with the work chain
Depending on the class type of the awaitable’s target a different callback function will be bound with the awaitable and the runner will be asked to call it when the target is completed
-
property
ctx
¶ Get context.
- Return type
-
insert_awaitable
(awaitable)[source]¶ Insert an awaitable that should be terminated before before continuing to the next step.
- Parameters
awaitable (
aiida.engine.processes.workchains.awaitable.Awaitable
) – the thing to await
-
load_instance_state
(saved_state, load_context)[source]¶ Load instance state.
- Parameters
saved_state – saved instance state
load_context (
plumpy.persistence.LoadSaveContext
) –
-
on_exiting
()[source]¶ Ensure that any unstored nodes in the context are stored, before the state is exited
After the state is exited the next state will be entered and if persistence is enabled, a checkpoint will be saved. If the context contains unstored nodes, the serialization necessary for checkpointing will fail.
-
on_process_finished
(awaitable, pk)[source]¶ Callback function called by the runner when the process instance identified by pk is completed.
The awaitable will be effectuated on the context of the work chain and removed from the internal list. If all awaitables have been dealt with, the work chain process is resumed.
- Parameters
awaitable – an Awaitable instance
pk (int) – the pk of the awaitable’s target
-
remove_awaitable
(awaitable)[source]¶ Remove an awaitable.
Precondition: must be an awaitable that was previously inserted.
- Parameters
awaitable – the awaitable to remove
-
-
aiida.engine.processes.
if_
(condition)[source]¶ A conditional that can be used in a workchain outline.
Use as:
if_(cls.conditional)( cls.step1, cls.step2 )
Each step can, of course, also be any valid workchain step e.g. conditional.
- Parameters
condition – The workchain method that will return True or False
-
aiida.engine.processes.
while_
(condition)[source]¶ A while loop that can be used in a workchain outline.
Use as:
while_(cls.conditional)( cls.step1, cls.step2 )
Each step can, of course, also be any valid workchain step e.g. conditional.
- Parameters
condition – The workchain method that will return True or False
Subpackages¶
Submodules¶
Convenience classes to help building the input dictionaries for Processes.
-
class
aiida.engine.processes.builder.
ProcessBuilder
(process_class)[source]¶ Bases:
aiida.engine.processes.builder.ProcessBuilderNamespace
A process builder that helps setting up the inputs for creating a new process.
-
__abstractmethods__
= frozenset({})¶
-
__init__
(process_class)[source]¶ Construct a ProcessBuilder instance for the given Process class.
- Parameters
process_class – the Process subclass
-
__module__
= 'aiida.engine.processes.builder'¶
-
_abc_impl
= <_abc_data object>¶
-
property
process_class
¶
-
-
class
aiida.engine.processes.builder.
ProcessBuilderNamespace
(port_namespace)[source]¶ Bases:
collections.abc.MutableMapping
Input namespace for the ProcessBuilder.
Dynamically generates the getters and setters for the input ports of a given PortNamespace
-
__abstractmethods__
= frozenset({})¶
-
__dict__
= mappingproxy({'__module__': 'aiida.engine.processes.builder', '__doc__': 'Input namespace for the `ProcessBuilder`.\n\n Dynamically generates the getters and setters for the input ports of a given PortNamespace\n ', '__init__': <function ProcessBuilderNamespace.__init__>, '__setattr__': <function ProcessBuilderNamespace.__setattr__>, '__repr__': <function ProcessBuilderNamespace.__repr__>, '__dir__': <function ProcessBuilderNamespace.__dir__>, '__iter__': <function ProcessBuilderNamespace.__iter__>, '__len__': <function ProcessBuilderNamespace.__len__>, '__getitem__': <function ProcessBuilderNamespace.__getitem__>, '__setitem__': <function ProcessBuilderNamespace.__setitem__>, '__delitem__': <function ProcessBuilderNamespace.__delitem__>, '_update': <function ProcessBuilderNamespace._update>, '_inputs': <function ProcessBuilderNamespace._inputs>, '_prune': <function ProcessBuilderNamespace._prune>, '__dict__': <attribute '__dict__' of 'ProcessBuilderNamespace' objects>, '__weakref__': <attribute '__weakref__' of 'ProcessBuilderNamespace' objects>, '__abstractmethods__': frozenset(), '_abc_impl': <_abc_data object>})¶
-
__init__
(port_namespace)[source]¶ Dynamically construct the get and set properties for the ports of the given port namespace.
For each port in the given port namespace a get and set property will be constructed dynamically and added to the ProcessBuilderNamespace. The docstring for these properties will be defined by calling str() on the Port, which should return the description of the Port.
- Parameters
port_namespace (str) – the inputs PortNamespace for which to construct the builder
-
__module__
= 'aiida.engine.processes.builder'¶
-
__setattr__
(attr, value)[source]¶ Assign the given value to the port with key attr.
Note
Any attributes without a leading underscore being set correspond to inputs and should hence be validated with respect to the corresponding input port from the process spec
- Parameters
attr (str) – attribute
value – value
-
__weakref__
¶ list of weak references to the object (if defined)
-
_abc_impl
= <_abc_data object>¶
-
_inputs
(prune=False)[source]¶ Return the entire mapping of inputs specified for this builder.
- Parameters
prune – boolean, when True, will prune nested namespaces that contain no actual values whatsoever
- Returns
mapping of inputs ports and their input values.
-
_prune
(value)[source]¶ Prune a nested mapping from all mappings that are completely empty.
Note
a nested mapping that is completely empty means it contains at most other empty mappings. Other null values, such as None or empty lists, should not be pruned.
- Parameters
value – a nested mapping of port values
- Returns
the same mapping but without any nested namespace that is completely empty.
-
_update
(*args, **kwds)[source]¶ Update the values of the builder namespace passing a mapping as argument or individual keyword value pairs.
The method is prefixed with an underscore in order to not reserve the name for a potential port, but in principle the method functions just as collections.abc.MutableMapping.update.
-
A namedtuple and namespace for ExitCodes that can be used to exit from Processes.
-
class
aiida.engine.processes.exit_code.
ExitCode
[source]¶ Bases:
aiida.engine.processes.exit_code.ExitCode
A simple data class to define an exit code for a
Process
.When an instance of this clas is returned from a Process._run() call, it will be interpreted that the Process should be terminated and that the exit status and message of the namedtuple should be set to the corresponding attributes of the node.
Note
this class explicitly sub-classes a namedtuple to not break backwards compatibility and to have it behave exactly as a tuple.
- Parameters
-
__dict__
= mappingproxy({'__module__': 'aiida.engine.processes.exit_code', '__doc__': 'A simple data class to define an exit code for a :class:`~aiida.engine.processes.process.Process`.\n\n When an instance of this clas is returned from a `Process._run()` call, it will be interpreted that the `Process`\n should be terminated and that the exit status and message of the namedtuple should be set to the corresponding\n attributes of the node.\n\n .. note:: this class explicitly sub-classes a namedtuple to not break backwards compatibility and to have it behave\n exactly as a tuple.\n\n :param status: positive integer exit status, where a non-zero value indicated the process failed, default is `0`\n :type status: int\n\n :param message: optional message with more details about the failure mode\n :type message: str\n\n :param invalidates_cache: optional flag, indicating that a process should not be used in caching\n :type invalidates_cache: bool\n ', 'format': <function ExitCode.format>, '__dict__': <attribute '__dict__' of 'ExitCode' objects>})¶
-
__module__
= 'aiida.engine.processes.exit_code'¶
-
class
aiida.engine.processes.exit_code.
ExitCodesNamespace
(dictionary=None)[source]¶ Bases:
aiida.common.extendeddicts.AttributeDict
A namespace of ExitCode instances that can be accessed through getattr as well as getitem.
Additionally, the collection can be called with an identifier, that can either reference the integer status of the ExitCode that needs to be retrieved or the key in the collection.
-
__call__
(identifier)[source]¶ Return a specific exit code identified by either its exit status or label.
- Parameters
identifier (str) – the identifier of the exit code. If the type is integer, it will be interpreted as the exit code status, otherwise it be interpreted as the exit code label
- Returns
an ExitCode instance
- Return type
- Raises
ValueError – if no exit code with the given label is defined for this process
-
__module__
= 'aiida.engine.processes.exit_code'¶
-
Class and decorators to generate processes out of simple python functions.
-
aiida.engine.processes.functions.
calcfunction
(function)[source]¶ A decorator to turn a standard python function into a calcfunction. Example usage:
>>> from aiida.orm import Int >>> >>> # Define the calcfunction >>> @calcfunction >>> def sum(a, b): >>> return a + b >>> # Run it with some input >>> r = sum(Int(4), Int(5)) >>> print(r) 9 >>> r.get_incoming().all() [Neighbor(link_type='', link_label='result', node=<CalcFunctionNode: uuid: ce0c63b3-1c84-4bb8-ba64-7b70a36adf34 (pk: 3567)>)] >>> r.get_incoming().get_node_by_label('result').get_incoming().all_nodes() [4, 5]
- Parameters
function (callable) – The function to decorate.
- Returns
The decorated function.
- Return type
callable
-
aiida.engine.processes.functions.
workfunction
(function)[source]¶ A decorator to turn a standard python function into a workfunction. Example usage:
>>> from aiida.orm import Int >>> >>> # Define the workfunction >>> @workfunction >>> def select(a, b): >>> return a >>> # Run it with some input >>> r = select(Int(4), Int(5)) >>> print(r) 4 >>> r.get_incoming().all() [Neighbor(link_type='', link_label='result', node=<WorkFunctionNode: uuid: ce0c63b3-1c84-4bb8-ba64-7b70a36adf34 (pk: 3567)>)] >>> r.get_incoming().get_node_by_label('result').get_incoming().all_nodes() [4, 5]
- Parameters
function (callable) – The function to decorate.
- Returns
The decorated function.
- Return type
callable
-
class
aiida.engine.processes.functions.
FunctionProcess
(*args, **kwargs)[source]¶ Bases:
aiida.engine.processes.process.Process
Function process class used for turning functions into a Process
-
_Process__called
= True¶
-
__abstractmethods__
= frozenset({})¶
-
__init__
(*args, **kwargs)[source]¶ Process constructor.
- Parameters
inputs (dict) – process inputs
logger (
logging.Logger
) – aiida loggerrunner – process runner
parent_pid (int) – id of parent process
enable_persistence (bool) – whether to persist this process
- Type
-
__module__
= 'aiida.engine.processes.functions'¶
-
_abc_impl
= <_abc_data object>¶
-
static
_func
(*_args, **_kwargs)[source]¶ This is used internally to store the actual function that is being wrapped and will be replaced by the build method.
-
_func_args
= None¶
-
_spec
= <aiida.engine.processes.process_spec.ProcessSpec object>¶
-
classmethod
args_to_dict
(*args)[source]¶ Create an input dictionary (of form label -> value) from supplied args.
-
static
build
(func, node_class)[source]¶ Build a Process from the given function.
All function arguments will be assigned as process inputs. If keyword arguments are specified then these will also become inputs.
- Parameters
func (callable) – The function to build a process from
node_class (
aiida.orm.nodes.process.process.ProcessNode
) – Provide a custom node class to be used, has to be constructable with no arguments. It has to be a sub class of ProcessNode and the mixinFunctionCalculationMixin
.
- Returns
A Process class that represents the function
- Return type
-
classmethod
create_inputs
(*args, **kwargs)[source]¶ Create the input args for the FunctionProcess.
- Return type
-
classmethod
get_or_create_db_record
()[source]¶ Create a process node that represents what happened in this process.
- Returns
A process node
- Return type
-
property
process_class
¶ Return the class that represents this Process, for the FunctionProcess this is the function itself.
For a standard Process or sub class of Process, this is the class itself. However, for legacy reasons, the Process class is a wrapper around another class. This function returns that original class, i.e. the class that really represents what was being executed.
- Returns
A Process class that represents the function
- Return type
-
Futures that can poll or receive broadcasted messages while waiting for a task to be completed.
-
class
aiida.engine.processes.futures.
CalculationFuture
(pk, loop=None, poll_interval=None, communicator=None)[source]¶ Bases:
plumpy.futures.Future
A future that waits for a calculation to complete using both polling and listening for broadcast events if possible
-
__init__
(pk, loop=None, poll_interval=None, communicator=None)[source]¶ Get a future for a calculation node being finished. If a None poll_interval is supplied polling will not be used. If a communicator is supplied it will be used to listen for broadcast messages.
- Parameters
pk – The calculation pk
loop – An event loop
poll_interval – The polling interval. Can be None in which case no polling.
communicator – A communicator. Can be None in which case no broadcast listens.
-
__module__
= 'aiida.engine.processes.futures'¶
-
_filtered
= None¶
-
AiiDA specific implementation of plumpy Ports and PortNamespaces for the ProcessSpec.
-
class
aiida.engine.processes.ports.
PortNamespace
(*args, **kwargs)[source]¶ Bases:
aiida.engine.processes.ports.WithNonDb
,plumpy.ports.PortNamespace
Sub class of plumpy.PortNamespace which implements the serialize method to support automatic recursive serialization of a given mapping onto the ports of the PortNamespace.
-
__abstractmethods__
= frozenset({})¶
-
__module__
= 'aiida.engine.processes.ports'¶
-
__setitem__
(key, port)[source]¶ Ensure that a Port being added inherits the non_db attribute if not explicitly defined at construction.
The reasoning is that if a PortNamespace has non_db=True, which is different from the default value, very often all leaves should be also non_db=True. To prevent a user from having to specify it manually everytime we overload the value here, unless it was specifically set during construction.
Note that the non_db attribute is not present for all Port sub classes so we have to check for it first.
-
_abc_impl
= <_abc_data object>¶
-
serialize
(mapping, breadcrumbs=())[source]¶ Serialize the given mapping onto this Portnamespace.
It will recursively call this function on any nested PortNamespace or the serialize function on any Ports.
- Parameters
mapping – a mapping of values to be serialized
breadcrumbs – a tuple with the namespaces of parent namespaces
- Returns
the serialized mapping
-
static
validate_port_name
(port_name)[source]¶ Validate the given port name.
Valid port names adhere to the following restrictions:
Is a valid link label (see below)
Does not contain two or more consecutive underscores
Valid link labels adhere to the following restrictions:
Has to be a valid python identifier
Can only contain alphanumeric characters and underscores
Can not start or end with an underscore
- Parameters
port_name – the proposed name of the port to be added
- Raises
TypeError – if the port name is not a string type
ValueError – if the port name is invalid
-
-
class
aiida.engine.processes.ports.
InputPort
(*args, **kwargs)[source]¶ Bases:
aiida.engine.processes.ports.WithSerialize
,aiida.engine.processes.ports.WithNonDb
,plumpy.ports.InputPort
Sub class of plumpy.InputPort which mixes in the WithSerialize and WithNonDb mixins to support automatic value serialization to database storable types and support non database storable input types as well.
-
__abstractmethods__
= frozenset({})¶
-
__init__
(*args, **kwargs)[source]¶ Override the constructor to check the type of the default if set and warn if not immutable.
-
__module__
= 'aiida.engine.processes.ports'¶
-
_abc_impl
= <_abc_data object>¶
-
-
class
aiida.engine.processes.ports.
OutputPort
(name, valid_type=None, help=None, required=True, validator=None)[source]¶ Bases:
plumpy.ports.Port
-
__abstractmethods__
= frozenset({})¶
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__module__
= 'plumpy.ports'¶
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_abc_impl
= <_abc_data object>¶
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class
aiida.engine.processes.ports.
CalcJobOutputPort
(*args, **kwargs)[source]¶ Bases:
plumpy.ports.OutputPort
Sub class of plumpy.OutputPort which adds the _pass_to_parser attribute.
-
__abstractmethods__
= frozenset({})¶
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__module__
= 'aiida.engine.processes.ports'¶
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_abc_impl
= <_abc_data object>¶
-
property
pass_to_parser
¶
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class
aiida.engine.processes.ports.
WithNonDb
(*args, **kwargs)[source]¶ Bases:
object
A mixin that adds support to a port to flag a that should not be stored in the database using the non_db=True flag.
The mixins have to go before the main port class in the superclass order to make sure the mixin has the chance to strip out the non_db keyword.
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__dict__
= mappingproxy({'__module__': 'aiida.engine.processes.ports', '__doc__': '\n A mixin that adds support to a port to flag a that should not be stored\n in the database using the non_db=True flag.\n\n The mixins have to go before the main port class in the superclass order\n to make sure the mixin has the chance to strip out the non_db keyword.\n ', '__init__': <function WithNonDb.__init__>, 'non_db_explicitly_set': <property object>, 'non_db': <property object>, '__dict__': <attribute '__dict__' of 'WithNonDb' objects>, '__weakref__': <attribute '__weakref__' of 'WithNonDb' objects>})¶
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__module__
= 'aiida.engine.processes.ports'¶
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__weakref__
¶ list of weak references to the object (if defined)
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property
non_db
¶ Return whether the value of this Port should be stored as a Node in the database.
- Returns
boolean, True if it should be storable as a Node, False otherwise
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property
non_db_explicitly_set
¶ Return whether the a value for non_db was explicitly passed in the construction of the Port.
- Returns
boolean, True if non_db was explicitly defined during construction, False otherwise
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class
aiida.engine.processes.ports.
WithSerialize
(*args, **kwargs)[source]¶ Bases:
object
A mixin that adds support for a serialization function which is automatically applied on inputs that are not AiiDA data types.
-
__dict__
= mappingproxy({'__module__': 'aiida.engine.processes.ports', '__doc__': '\n A mixin that adds support for a serialization function which is automatically applied on inputs\n that are not AiiDA data types.\n ', '__init__': <function WithSerialize.__init__>, 'serialize': <function WithSerialize.serialize>, '__dict__': <attribute '__dict__' of 'WithSerialize' objects>, '__weakref__': <attribute '__weakref__' of 'WithSerialize' objects>})¶
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__module__
= 'aiida.engine.processes.ports'¶
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__weakref__
¶ list of weak references to the object (if defined)
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The AiiDA process class
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class
aiida.engine.processes.process.
Process
(inputs=None, logger=None, runner=None, parent_pid=None, enable_persistence=True)[source]¶ Bases:
plumpy.processes.Process
This class represents an AiiDA process which can be executed and will have full provenance saved in the database.
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SINGLE_OUTPUT_LINKNAME
= 'result'¶
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class
SaveKeys
[source]¶ Bases:
enum.Enum
Keys used to identify things in the saved instance state bundle.
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CALC_ID
= 'calc_id'¶
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__module__
= 'aiida.engine.processes.process'¶
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_Process__called
= True¶
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__abstractmethods__
= frozenset({})¶
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__init__
(inputs=None, logger=None, runner=None, parent_pid=None, enable_persistence=True)[source]¶ Process constructor.
- Parameters
inputs (dict) – process inputs
logger (
logging.Logger
) – aiida loggerrunner – process runner
parent_pid (int) – id of parent process
enable_persistence (bool) – whether to persist this process
- Type
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__module__
= 'aiida.engine.processes.process'¶
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_abc_impl
= <_abc_data object>¶
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_auto_persist
= {'_CREATION_TIME', '_enable_persistence', '_future', '_parent_pid', '_paused', '_pid', '_pre_paused_status', '_status'}¶
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_create_and_setup_db_record
()[source]¶ Create and setup the database record for this process
- Returns
the uuid of the process
- Return type
uuid.UUID
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_flat_inputs
()[source]¶ Return a flattened version of the parsed inputs dictionary.
The eventual keys will be a concatenation of the nested keys. Note that the metadata dictionary, if present, is not passed, as those are dealt with separately in _setup_metadata.
- Returns
flat dictionary of parsed inputs
- Return type
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_flat_outputs
()[source]¶ Return a flattened version of the registered outputs dictionary.
The eventual keys will be a concatenation of the nested keys.
- Returns
flat dictionary of parsed outputs
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_flatten_inputs
(port, port_value, parent_name='', separator='__')[source]¶ Function that will recursively flatten the inputs dictionary, omitting inputs for ports that are marked as being non database storable
- Parameters
port (
plumpy.ports.Port
) – port against which to map the port value, can be InputPort or PortNamespaceport_value – value for the current port, can be a Mapping
parent_name (str) – the parent key with which to prefix the keys
separator (str) – character to use for the concatenation of keys
- Returns
flat list of inputs
- Return type
-
_flatten_outputs
(port, port_value, parent_name='', separator='__')[source]¶ Function that will recursively flatten the outputs dictionary.
- Parameters
port (
plumpy.ports.Port
) – port against which to map the port value, can be OutputPort or PortNamespaceport_value – value for the current port, can be a Mapping
parent_name (str) – the parent key with which to prefix the keys
separator (str) – character to use for the concatenation of keys
- Returns
flat list of outputs
- Return type
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static
_get_namespace_list
(namespace=None, agglomerate=True)[source]¶ Get the list of namespaces in a given namespace.
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_node_class
¶
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_save_checkpoint
()[source]¶ Save the current state in a chechpoint if persistence is enabled and the process state is not terminal
If the persistence call excepts with a PersistenceError, it will be caught and a warning will be logged.
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_setup_db_record
()[source]¶ Create the database record for this process and the links with respect to its inputs
This function will set various attributes on the node that serve as a proxy for attributes of the Process. This is essential as otherwise this information could only be introspected through the Process itself, which is only available to the interpreter that has it in memory. To make this data introspectable from any interpreter, for example for the command line interface, certain Process attributes are proxied through the calculation node.
In addition, the parent calculation will be setup with a CALL link if applicable and all inputs will be linked up as well.
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_setup_inputs
()[source]¶ Create the links between the input nodes and the ProcessNode that represents this process.
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_spec
= <aiida.engine.processes.process_spec.ProcessSpec object>¶
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_spec_class
¶
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classmethod
build_process_type
()[source]¶ The process type.
- Returns
string of the process type
- Return type
Note: This could be made into a property ‘process_type’ but in order to have it be a property of the class it would need to be defined in the metaclass, see https://bugs.python.org/issue20659
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decode_input_args
(encoded)[source]¶ Decode saved input arguments as they came from the saved instance state Bundle
- Parameters
encoded – encoded (serialized) inputs
- Returns
The decoded input args
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encode_input_args
(inputs)[source]¶ Encode input arguments such that they may be saved in a Bundle
- Parameters
inputs – A mapping of the inputs as passed to the process
- Returns
The encoded (serialized) inputs
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exit_codes
= {'ERROR_INVALID_OUTPUT': ExitCode(status=10, message='The process returned an invalid output.', invalidates_cache=False), 'ERROR_LEGACY_FAILURE': ExitCode(status=2, message='The process failed with legacy failure mode.', invalidates_cache=False), 'ERROR_MISSING_OUTPUT': ExitCode(status=11, message='The process did not register a required output.', invalidates_cache=False), 'ERROR_UNSPECIFIED': ExitCode(status=1, message='The process has failed with an unspecified error.', invalidates_cache=False)}¶
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exposed_inputs
(process_class, namespace=None, agglomerate=True)[source]¶ Gather a dictionary of the inputs that were exposed for a given Process class under an optional namespace.
- Parameters
process_class (
aiida.engine.Process
) – Process class whose inputs to try and retrievenamespace (str) – PortNamespace in which to look for the inputs
agglomerate (bool) – If set to true, all parent namespaces of the given
namespace
will also be searched for inputs. Inputs in lower-lying namespaces take precedence.
- Returns
exposed inputs
- Return type
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exposed_outputs
(node, process_class, namespace=None, agglomerate=True)[source]¶ Return the outputs which were exposed from the
process_class
and emitted by the specificnode
- Parameters
node (
aiida.orm.nodes.process.ProcessNode
) – process node whose outputs to try and retrievenamespace (str) – Namespace in which to search for exposed outputs.
agglomerate (bool) – If set to true, all parent namespaces of the given
namespace
will also be searched for outputs. Outputs in lower-lying namespaces take precedence.
- Returns
exposed outputs
- Return type
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classmethod
get_exit_statuses
(exit_code_labels)[source]¶ Return the exit status (integers) for the given exit code labels.
- Parameters
exit_code_labels – a list of strings that reference exit code labels of this process class
- Returns
list of exit status integers that correspond to the given exit code labels
- Raises
AttributeError – if at least one of the labels does not correspond to an existing exit code
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classmethod
get_or_create_db_record
()[source]¶ Create a process node that represents what happened in this process.
- Returns
A process node
- Return type
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get_parent_calc
()[source]¶ Get the parent process node
- Returns
the parent process node if there is one
- Return type
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classmethod
is_valid_cache
(node)[source]¶ Check if the given node can be cached from.
Warning
When overriding this method, make sure to call super().is_valid_cache(node) and respect its output. Otherwise, the ‘invalidates_cache’ keyword on exit codes will not work.
This method allows extending the behavior of ProcessNode.is_valid_cache from Process sub-classes, for example in plug-ins.
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load_instance_state
(saved_state, load_context)[source]¶ Load instance state.
- Parameters
saved_state – saved instance state
load_context (
plumpy.persistence.LoadSaveContext
) –
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property
metadata
¶ Return the metadata that were specified when this process instance was launched.
- Returns
metadata dictionary
- Return type
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property
node
¶ Return the ProcessNode used by this process to represent itself in the database.
- Returns
instance of sub class of ProcessNode
- Return type
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on_except
(exc_info)[source]¶ Log the exception by calling the report method with formatted stack trace from exception info object and store the exception string as a node attribute
- Parameters
exc_info – the sys.exc_info() object (type, value, traceback)
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on_finish
(result, successful)[source]¶ Set the finish status on the process node.
- Parameters
result (int or
aiida.engine.ExitCode
) – result of the processsuccessful (bool) – whether execution was successful
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on_output_emitting
(output_port, value)[source]¶ The process has emitted a value on the given output port.
- Parameters
output_port (str) – The output port name the value was emitted on
value – The value emitted
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on_paused
(msg=None)[source]¶ The Process was paused so set the paused attribute on the process node
- Parameters
msg (str) – message
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out
(output_port, value=None)[source]¶ Attach output to output port.
The name of the port will be used as the link label.
- Parameters
output_port (str) – name of output port
value – value to put inside output port
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out_many
(out_dict)[source]¶ Attach outputs to multiple output ports.
Keys of the dictionary will be used as output port names, values as outputs.
- Parameters
out_dict (dict) – output dictionary
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report
(msg, *args, **kwargs)[source]¶ Log a message to the logger, which should get saved to the database through the attached DbLogHandler.
The pk, class name and function name of the caller are prepended to the given message
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property
runner
¶ Get process runner.
- Return type
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save_instance_state
(out_state, save_context)[source]¶ Save instance state.
See documentation of
plumpy.processes.Process.save_instance_state()
.
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set_status
(status)[source]¶ The status of the Process is about to be changed, so we reflect this is in node’s attribute proxy.
- Parameters
status (str) – the status message
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spec_metadata
= <aiida.engine.processes.ports.PortNamespace object>¶
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submit
(process, *args, **kwargs)[source]¶ Submit process for execution.
- Parameters
process (
aiida.engine.Process
) – process
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update_outputs
()[source]¶ Attach new outputs to the node since the last call.
Does nothing, if self.metadata.store_provenance is False.
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property
uuid
¶ Return the UUID of the process which corresponds to the UUID of its associated ProcessNode.
- Returns
the UUID associated to this process instance
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class
aiida.engine.processes.process.
ProcessState
[source]¶ Bases:
enum.Enum
The possible states that a
Process
can be in.-
CREATED
= 'created'¶
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EXCEPTED
= 'excepted'¶
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FINISHED
= 'finished'¶
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KILLED
= 'killed'¶
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RUNNING
= 'running'¶
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WAITING
= 'waiting'¶
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__module__
= 'plumpy.process_states'¶
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AiiDA specific implementation of plumpy’s ProcessSpec.
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class
aiida.engine.processes.process_spec.
CalcJobProcessSpec
[source]¶ Bases:
aiida.engine.processes.process_spec.ProcessSpec
Process spec intended for the CalcJob process class.
-
OUTPUT_PORT_TYPE
¶
-
__module__
= 'aiida.engine.processes.process_spec'¶
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property
default_output_node
¶
-
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class
aiida.engine.processes.process_spec.
ProcessSpec
[source]¶ Bases:
plumpy.process_spec.ProcessSpec
Default process spec for process classes defined in aiida-core.
This sub class defines custom classes for input ports and port namespaces. It also adds support for the definition of exit codes and retrieving them subsequently.
-
INPUT_PORT_TYPE
¶
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METADATA_KEY
= 'metadata'¶
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METADATA_OPTIONS_KEY
= 'options'¶
-
PORT_NAMESPACE_TYPE
¶
-
__module__
= 'aiida.engine.processes.process_spec'¶
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exit_code
(status, label, message, invalidates_cache=False)[source]¶ Add an exit code to the ProcessSpec
- Parameters
status – the exit status integer
label – a label by which the exit code can be addressed
message – a more detailed description of the exit code
invalidates_cache – when set to True, a process exiting with this exit code will not be considered for caching
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property
exit_codes
¶ Return the namespace of exit codes defined for this ProcessSpec
- Returns
ExitCodesNamespace of ExitCode named tuples
-
property
metadata_key
¶
-
property
options_key
¶
-