add new task doc base

emmet-core/emmet/core/task.py

@@ -0,0 +1,35 @@
+""" Core definition of a Task Document which represents a calculation from some program"""
+from datetime import datetime
+from typing import ClassVar, List
+
+from pydantic import BaseModel, Field
+
+from emmet.core.mpid import MPID
+
+
+class TaskDocument(BaseModel):
+    """
+    Definition of Task Document
+    """
+
+    calc_code: ClassVar[str] = Field(
+        ..., description="The calculation code used to compute this task"
+    )
+    version: str = Field(..., description="The version of the calculation code")
+    dir_name: str = Field(None, description="The directory for this task")
+    task_id: MPID = Field(None, description="the Task ID For this document")
+
+    completed: bool = Field(False, description="Whether this calcuation completed")
+    completed_at: datetime = Field(
+        None, description="Timestamp for when this task was completed"
+    )
+    last_updated: datetime = Field(
+        default_factory=datetime.utcnow,
+        description="Timestamp for this task document was last updateed",
+    )
+
+    tags: List[str] = Field([], description="Metadata tags for this task document")
+
+    warnings: List[str] = Field(
+        None, description="Any warnings related to this property"
+    )