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"""Functions to perform common checks.
These are useful for reusability, and hence maintainability of the code.
"""
from functools import wraps
from flask import flash, url_for, redirect, current_app as app
from uploader.species.models import species_by_id
from uploader.db_utils import database_connection
from uploader.population.models import population_by_species_and_id
def with_species(redirect_uri: str):
"""Ensure the species actually exists."""
def __decorator__(function):
@wraps(function)
def __with_species__(**kwargs):
try:
species_id = int(kwargs.get("species_id"))
if not bool(species_id):
flash("Expected species_id value to be present!",
"alert-danger")
return redirect(url_for(redirect_uri))
with database_connection(app.config["SQL_URI"]) as conn:
species = species_by_id(conn, species_id)
if not bool(species):
flash("Could not find species with that ID",
"alert-danger")
return redirect(url_for(redirect_uri))
except ValueError as _verr:
app.logger.debug(
"Exception converting value to integer: %s",
kwargs.get("species_id"),
exc_info=True)
flash("Expected an integer for 'species_id' value.",
"alert-danger")
return redirect(url_for(redirect_uri))
return function(**{**kwargs, "species": species})
return __with_species__
return __decorator__
def with_population(species_redirect_uri: str, redirect_uri: str):
"""Ensure the population actually exists."""
def __decorator__(function):
@wraps(function)
@with_species(redirect_uri=species_redirect_uri)
def __with_population__(**kwargs):
try:
species_id = int(kwargs["species_id"])
population_id = int(kwargs.get("population_id"))
select_population_uri = redirect(url_for(
redirect_uri, species_id=species_id))
if not bool(population_id):
flash("Expected population_id value to be present!",
"alert-danger")
return select_population_uri
with database_connection(app.config["SQL_URI"]) as conn:
population = population_by_species_and_id(
conn, species_id, population_id)
if not bool(population):
flash("Could not find population with that ID",
"alert-danger")
return select_population_uri
except ValueError as _verr:
app.logger.debug(
"Exception converting value to integer: %s",
kwargs.get("population_id"),
exc_info=True)
flash("Expected an integer for 'population_id' value.",
"alert-danger")
return select_population_uri
return function(**{**kwargs, "population": population})
return __with_population__
return __decorator__
|
