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Python

"""Schemas for Home Assistant entities bound to a printer (#1148, #448)."""
from datetime import datetime
from typing import Literal
from pydantic import BaseModel, Field, model_validator
class PrinterHASensorBase(BaseModel):
printer_id: int
name: str = Field(..., min_length=1, max_length=100)
# max_length matches the column (String(255)). The pattern's [a-z0-9_]+ is
# unbounded, so a direct API caller could send a longer id: SQLite stores
# it, PostgreSQL raises DataError, and it would surface as a 500 rather
# than a 422. Same bound as the location sibling.
entity_id: str = Field(..., max_length=255, pattern=r"^(binary_sensor|sensor)\.[a-z0-9_]+$")
kind: Literal["binary", "numeric"] = "binary"
device_class: str | None = Field(default=None, max_length=32)
unit: str | None = Field(default=None, max_length=16)
alert_state: Literal["on", "off"] | None = None
alert_above: float | None = None
alert_below: float | None = None
block_print: bool = False
notify_on_alert: bool = False
show_on_printer_card: bool = True
sort_order: int = Field(default=0, ge=0, le=999)
@model_validator(mode="after")
def validate_kind_matches_entity(self) -> "PrinterHASensorBase":
domain = self.entity_id.split(".")[0]
expected = "binary" if domain == "binary_sensor" else "numeric"
if self.kind != expected:
raise ValueError(f"kind must be '{expected}' for a {domain} entity")
# Alert fields are per-kind: a threshold on a door contact and an
# on/off alert on a thermometer are both configuration the poller
# would silently ignore, so reject them at the edge instead.
if self.kind == "binary" and (self.alert_above is not None or self.alert_below is not None):
raise ValueError("alert_above/alert_below only apply to numeric sensors")
if self.kind == "numeric" and self.alert_state is not None:
raise ValueError("alert_state only applies to binary sensors")
if self.alert_above is not None and self.alert_below is not None and self.alert_below >= self.alert_above:
raise ValueError("alert_below must be lower than alert_above")
# An interlock or a notification with nothing to trigger on would never
# fire — that reads as a broken feature, not as a no-op.
if (self.block_print or self.notify_on_alert) and not self._has_alert_condition():
raise ValueError("block_print and notify_on_alert require an alert condition")
return self
def _has_alert_condition(self) -> bool:
return self.alert_state is not None or self.alert_above is not None or self.alert_below is not None
class PrinterHASensorCreate(PrinterHASensorBase):
pass
class PrinterHASensorUpdate(BaseModel):
"""Partial update. Validated against the merged row in the route, because
the per-kind rules above need fields this payload may not carry."""
name: str | None = Field(default=None, min_length=1, max_length=100)
# Same column-width bound as the base schema; PATCH reaches the same row.
entity_id: str | None = Field(default=None, max_length=255, pattern=r"^(binary_sensor|sensor)\.[a-z0-9_]+$")
kind: Literal["binary", "numeric"] | None = None
device_class: str | None = Field(default=None, max_length=32)
unit: str | None = Field(default=None, max_length=16)
alert_state: Literal["on", "off"] | None = None
alert_above: float | None = None
alert_below: float | None = None
block_print: bool | None = None
notify_on_alert: bool | None = None
show_on_printer_card: bool | None = None
sort_order: int | None = Field(default=None, ge=0, le=999)
class PrinterHASensorResponse(PrinterHASensorBase):
# Reads stay tolerant of what writes now reject: this feature shipped
# before entity_id was bounded, and SQLite never enforced the column's 255,
# so a row longer than that can genuinely exist. Inheriting the bound would
# turn it into a 500 on the list route — the same failure the bound was
# added to prevent, moved from the write path to the read path. The pattern
# is dropped with it, for the same generation of rows. Writes are unchanged.
entity_id: str
id: int
last_state: str | None = None
last_changed: datetime | None = None
last_checked: datetime | None = None
created_at: datetime
updated_at: datetime
class Config:
from_attributes = True
class PrinterHASensorReading(BaseModel):
"""One sensor's live state, as the printer card renders it."""
id: int
name: str
entity_id: str
kind: str
device_class: str | None = None
unit: str | None = None
# Raw HA state: "on"/"off" for binary, the numeric string for sensors.
# None when the entity is unavailable or has not been polled yet.
state: str | None = None
value: float | None = None # numeric sensors only, parsed from state
alerting: bool = False
block_print: bool = False
reachable: bool = True
last_changed: datetime | None = None
class HADisplayEntity(BaseModel):
"""A bindable entity, as offered by the picker."""
entity_id: str
friendly_name: str
state: str | None = None
domain: str
device_class: str | None = None
unit_of_measurement: str | None = None