98 lines
4.3 KiB
Python
98 lines
4.3 KiB
Python
from datetime import datetime
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from sqlalchemy import desc
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from crc import db, session
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from crc.models.approval import ApprovalModel, ApprovalStatus, ApprovalFile
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from crc.services.file_service import FileService
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class ApprovalService(object):
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"""Provides common tools for working with an Approval"""
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@staticmethod
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def get_approvals_per_user(approver_uid):
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"""Returns a list of all approvals for the given user (approver)"""
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db_approvals = session.query(ApprovalModel).filter_by(approver_uid=approver_uid).all()
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return db_approvals
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@staticmethod
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def get_all_approvals():
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"""Returns a list of all approvlas"""
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db_approvals = session.query(ApprovalModel).all()
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return db_approvals
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@staticmethod
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def update_approval(approval_id, approver_uid, status):
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"""Update a specific approval"""
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db_approval = session.query(ApprovalModel).get(approval_id)
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if db_approval:
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db_approval.status = status
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session.add(db_approval)
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session.commit()
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# TODO: Log update action by approver_uid - maybe ?
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return db_approval
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@staticmethod
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def add_approval(study_id, workflow_id, approver_uid):
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"""we might have multiple approvals for a workflow, so I would expect this
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method to get called multiple times for the same workflow. This will
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only add a new approval if no approval already exists for the approver_uid,
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unless the workflow has changed, at which point, it will CANCEL any
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pending approvals and create a new approval for the latest version
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of the workflow."""
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# Find any existing approvals for this workflow and approver.
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latest_approval_request = db.session.query(ApprovalModel). \
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filter(ApprovalModel.workflow_id == workflow_id). \
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filter(ApprovalModel.approver_uid == approver_uid). \
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order_by(desc(ApprovalModel.version)).first()
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# Construct as hash of the latest files to see if things have changed since
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# the last approval.
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latest_files = FileService.get_workflow_files(workflow_id)
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current_workflow_hash = ApprovalService._generate_workflow_hash(latest_files)
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# If an existing approval request exists and no changes were made, do nothing.
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# If there is an existing approval request for a previous version of the workflow
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# then add a new request, and cancel any waiting/pending requests.
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if latest_approval_request:
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# We could just compare the ApprovalFile lists here and do away with this hash.
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if latest_approval_request.workflow_hash == current_workflow_hash:
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return # This approval already exists.
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else:
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latest_approval_request.status = ApprovalStatus.CANCELED.value
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db.session.add(latest_approval_request)
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version = latest_approval_request.version + 1
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else:
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version = 1
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model = ApprovalModel(study_id=study_id, workflow_id=workflow_id,
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approver_uid=approver_uid, status=ApprovalStatus.WAITING.value,
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message="", date_created=datetime.now(),
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version=version, workflow_hash=current_workflow_hash)
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approval_files = ApprovalService._create_approval_files(latest_files, model)
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db.session.add(model)
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db.session.add_all(approval_files)
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db.session.commit()
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@staticmethod
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def _create_approval_files(files, approval):
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"""Currently based exclusively on the status of files associated with a workflow."""
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file_approval_models = []
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for file in files:
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file_approval_models.append(ApprovalFile(file_id=file.id,
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approval=approval,
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file_version=file.latest_version))
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return file_approval_models
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@staticmethod
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def _generate_workflow_hash(files):
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"""Currently based exclusively on the status of files associated with a workflow."""
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version_array = []
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for file in files:
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version_array.append(str(file.id) + "[" + str(file.latest_version) + "]")
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full_version = "-".join(version_array)
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return full_version
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