cr-connect-workflow/crc/api/workflow.py

import uuid

from SpiffWorkflow.util.deep_merge import DeepMerge
from flask import g
from crc import session, app
from crc.api.common import ApiError, ApiErrorSchema
from crc.models.api_models import WorkflowApi, WorkflowApiSchema, NavigationItem, NavigationItemSchema
from crc.models.file import FileModel, LookupDataSchema
from crc.models.stats import TaskEventModel
from crc.models.workflow import WorkflowModel, WorkflowSpecModelSchema, WorkflowSpecModel, WorkflowSpecCategoryModel, \
    WorkflowSpecCategoryModelSchema
from crc.services.file_service import FileService
from crc.services.lookup_service import LookupService
from crc.services.study_service import StudyService
from crc.services.workflow_processor import WorkflowProcessor
from crc.services.workflow_service import WorkflowService


def all_specifications():
    schema = WorkflowSpecModelSchema(many=True)
    return schema.dump(session.query(WorkflowSpecModel).all())


def add_workflow_specification(body):
    new_spec: WorkflowSpecModel = WorkflowSpecModelSchema().load(body, session=session)
    session.add(new_spec)
    session.commit()
    return WorkflowSpecModelSchema().dump(new_spec)


def get_workflow_specification(spec_id):
    if spec_id is None:
        raise ApiError('unknown_spec', 'Please provide a valid Workflow Specification ID.')

    spec: WorkflowSpecModel = session.query(WorkflowSpecModel).filter_by(id=spec_id).first()

    if spec is None:
        raise ApiError('unknown_spec', 'The Workflow Specification "' + spec_id + '" is not recognized.')

    return WorkflowSpecModelSchema().dump(spec)


def validate_workflow_specification(spec_id):

    errors = []
    try:
        WorkflowService.test_spec(spec_id)
    except ApiError as ae:
        ae.message = "When populating all fields ... " + ae.message
        errors.append(ae)
    try:
        # Run the validation twice, the second time, just populate the required fields.
        WorkflowService.test_spec(spec_id, required_only=True)
    except ApiError as ae:
        ae.message = "When populating only required fields ... " + ae.message
        errors.append(ae)
    return ApiErrorSchema(many=True).dump(errors)



def update_workflow_specification(spec_id, body):
    if spec_id is None:
        raise ApiError('unknown_spec', 'Please provide a valid Workflow Spec ID.')
    spec = session.query(WorkflowSpecModel).filter_by(id=spec_id).first()

    if spec is None:
        raise ApiError('unknown_study', 'The spec "' + spec_id + '" is not recognized.')

    schema = WorkflowSpecModelSchema()
    spec = schema.load(body, session=session, instance=spec, partial=True)
    session.add(spec)
    session.commit()
    return schema.dump(spec)


def delete_workflow_specification(spec_id):
    if spec_id is None:
        raise ApiError('unknown_spec', 'Please provide a valid Workflow Specification ID.')

    spec: WorkflowSpecModel = session.query(WorkflowSpecModel).filter_by(id=spec_id).first()

    if spec is None:
        raise ApiError('unknown_spec', 'The Workflow Specification "' + spec_id + '" is not recognized.')

    # Delete all items in the database related to the deleted workflow spec.
    files = session.query(FileModel).filter_by(workflow_spec_id=spec_id).all()
    for file in files:
        FileService.delete_file(file.id)

    session.query(TaskEventModel).filter(TaskEventModel.workflow_spec_id == spec_id).delete()

    # Delete all stats and workflow models related to this specification
    for workflow in session.query(WorkflowModel).filter_by(workflow_spec_id=spec_id):
        StudyService.delete_workflow(workflow)
    session.query(WorkflowSpecModel).filter_by(id=spec_id).delete()
    session.commit()


def get_workflow(workflow_id, soft_reset=False, hard_reset=False):
    workflow_model: WorkflowModel = session.query(WorkflowModel).filter_by(id=workflow_id).first()
    processor = WorkflowProcessor(workflow_model, soft_reset=soft_reset, hard_reset=hard_reset)
    workflow_api_model = WorkflowService.processor_to_workflow_api(processor)
    return WorkflowApiSchema().dump(workflow_api_model)


def delete_workflow(workflow_id):
    StudyService.delete_workflow(workflow_id)


def set_current_task(workflow_id, task_id):
    workflow_model = session.query(WorkflowModel).filter_by(id=workflow_id).first()
    user_uid = __get_user_uid(workflow_model.study.user_uid)
    processor = WorkflowProcessor(workflow_model)
    task_id = uuid.UUID(task_id)
    spiff_task = processor.bpmn_workflow.get_task(task_id)
    if spiff_task.state != spiff_task.COMPLETED and spiff_task.state != spiff_task.READY:
        raise ApiError("invalid_state", "You may not move the token to a task who's state is not "
                                        "currently set to COMPLETE or READY.")

    # Only reset the token if the task doesn't already have it.
    if spiff_task.state == spiff_task.COMPLETED:
        spiff_task.reset_token(reset_data=True)  # Don't try to copy the existing data back into this task.

    processor.save()
    WorkflowService.log_task_action(user_uid, workflow_model, spiff_task,
                                    WorkflowService.TASK_ACTION_TOKEN_RESET,
                                    version=processor.get_version_string())
    workflow_api_model = WorkflowService.processor_to_workflow_api(processor, spiff_task)
    return WorkflowApiSchema().dump(workflow_api_model)


def update_task(workflow_id, task_id, body):
    workflow_model = session.query(WorkflowModel).filter_by(id=workflow_id).first()

    if workflow_model is None:
        raise ApiError("invalid_workflow_id", "The given workflow id is not valid.", status_code=404)

    elif workflow_model.study is None:
        raise ApiError("invalid_study", "There is no study associated with the given workflow.", status_code=404)

    user_uid = __get_user_uid(workflow_model.study.user_uid)
    processor = WorkflowProcessor(workflow_model)
    task_id = uuid.UUID(task_id)
    spiff_task = processor.bpmn_workflow.get_task(task_id)
    if spiff_task.state != spiff_task.READY:
        raise ApiError("invalid_state", "You may not update a task unless it is in the READY state. "
                                        "Consider calling a token reset to make this task Ready.")
    if body: # IF and only if we get the body back, update the task data with the content.
        spiff_task.data = body # Accept the data from the front end as complete.  Do not merge it in, as then it is impossible to remove items.
    processor.complete_task(spiff_task)
    processor.do_engine_steps()
    processor.save()

    WorkflowService.log_task_action(user_uid, workflow_model, spiff_task, WorkflowService.TASK_ACTION_COMPLETE,
                                    version=processor.get_version_string())
    workflow_api_model = WorkflowService.processor_to_workflow_api(processor)
    return WorkflowApiSchema().dump(workflow_api_model)


def list_workflow_spec_categories():
    schema = WorkflowSpecCategoryModelSchema(many=True)
    return schema.dump(session.query(WorkflowSpecCategoryModel).all())


def get_workflow_spec_category(cat_id):
    schema = WorkflowSpecCategoryModelSchema()
    return schema.dump(session.query(WorkflowSpecCategoryModel).filter_by(id=cat_id).first())


def add_workflow_spec_category(body):
    schema = WorkflowSpecCategoryModelSchema()
    new_cat: WorkflowSpecCategoryModel = schema.load(body, session=session)
    session.add(new_cat)
    session.commit()
    return schema.dump(new_cat)


def update_workflow_spec_category(cat_id, body):
    if cat_id is None:
        raise ApiError('unknown_category', 'Please provide a valid Workflow Spec Category ID.')

    category = session.query(WorkflowSpecCategoryModel).filter_by(id=cat_id).first()

    if category is None:
        raise ApiError('unknown_category', 'The category "' + cat_id + '" is not recognized.')

    schema = WorkflowSpecCategoryModelSchema()
    category = schema.load(body, session=session, instance=category, partial=True)
    session.add(category)
    session.commit()
    return schema.dump(category)


def delete_workflow_spec_category(cat_id):
    session.query(WorkflowSpecCategoryModel).filter_by(id=cat_id).delete()
    session.commit()


def lookup(workflow_id, field_id, query, limit):
    """
    given a field in a task, attempts to find the lookup table or function associated
    with that field and runs a full-text query against it to locate the values and
    labels that would be returned to a type-ahead box.
    Tries to be fast, but first runs will be very slow.
    """
    workflow = session.query(WorkflowModel).filter(WorkflowModel.id == workflow_id).first()
    lookup_data = LookupService.lookup(workflow, field_id, query, limit)
    return LookupDataSchema(many=True).dump(lookup_data)


def __get_user_uid(user_uid):
    if 'user' in g:
        if g.user.uid not in app.config['ADMIN_UIDS'] and user_uid != g.user.uid:
            raise ApiError("permission_denied", "You are not authorized to edit the task data for this workflow.", status_code=403)
        else:
            return g.user.uid

    else:
        raise ApiError("logged_out", "You are no longer logged in.", status_code=401)