Move VersionedAttributes code into appropriotely named module.

[plomtask] / plomtask / misc.py

diff --git a/plomtask/misc.py b/plomtask/misc.py
deleted file mode 100644 (file)
index ab39df0..0000000
--- a/plomtask/misc.py
+++ /dev/null
@@ -1,68 +0,0 @@
-"""Attributes whose values are recorded as a timestamped history."""
-from datetime import datetime
-from typing import Any
-from sqlite3 import Row
-from time import sleep
-from plomtask.db import DatabaseConnection
-
-TIMESTAMP_FMT = '%Y-%m-%d %H:%M:%S.%f'
-
-
-class VersionedAttribute:
-    """Attributes whose values are recorded as a timestamped history."""
-
-    def __init__(self,
-                 parent: Any, table_name: str, default: str | float) -> None:
-        self.parent = parent
-        self.table_name = table_name
-        self.default = default
-        self.history: dict[str, str | float] = {}
-
-    @property
-    def _newest_timestamp(self) -> str:
-        """Return most recent timestamp."""
-        return sorted(self.history.keys())[-1]
-
-    @property
-    def newest(self) -> str | float:
-        """Return most recent value, or self.default if self.history empty."""
-        if 0 == len(self.history):
-            return self.default
-        return self.history[self._newest_timestamp]
-
-    def set(self, value: str | float) -> None:
-        """Add to self.history if and only if not same value as newest one.
-
-        Note that we wait one micro-second, as timestamp comparison to check
-        most recent elements only goes up to that precision.
-
-        Also note that we don't check against .newest because that may make us
-        compare value against .default even if not set. We want to be able to
-        explicitly set .default as the first element.
-        """
-        sleep(0.00001)
-        if 0 == len(self.history) \
-                or value != self.history[self._newest_timestamp]:
-            self.history[datetime.now().strftime(TIMESTAMP_FMT)] = value
-
-    def history_from_row(self, row: Row) -> None:
-        """Extend self.history from expected table row format."""
-        self.history[row[1]] = row[2]
-
-    def at(self, queried_time: str) -> str | float:
-        """Retrieve value of timestamp nearest queried_time from the past."""
-        sorted_timestamps = sorted(self.history.keys())
-        if 0 == len(sorted_timestamps):
-            return self.default
-        selected_timestamp = sorted_timestamps[0]
-        for timestamp in sorted_timestamps[1:]:
-            if timestamp > queried_time:
-                break
-            selected_timestamp = timestamp
-        return self.history[selected_timestamp]
-
-    def save(self, db_conn: DatabaseConnection) -> None:
-        """Save as self.history entries, but first wipe old ones."""
-        db_conn.rewrite_relations(self.table_name, 'parent', self.parent.id_,
-                                  [[item[0], item[1]]
-                                   for item in self.history.items()])