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"""Generic views and utilities to handle background jobs."""
import uuid
import datetime
import importlib
from functools import partial
from typing import Union, Callable, Optional
from werkzeug.wrappers.response import Response
from flask import (
flash,
request,
redirect,
Blueprint,
current_app as app)
from gn_libs import jobs
from gn_libs import sqlite3
from gn_libs.jobs.jobs import JobNotFound
from uploader import session
from uploader.authorisation import require_login
from uploader.oauth2.client import user_logged_in
from uploader.flask_extensions import url_for, render_template
background_jobs_bp = Blueprint("background-jobs", __name__)
HandlerType = Callable[[dict], Response]
def __default_error_handler__(job: dict) -> Response:
return redirect(url_for("background-jobs.job_summary", job_id=job["job_id"]))
def register_handlers(
job_type: str,
success_handler: HandlerType,
# pylint: disable=[redefined-outer-name]
error_handler: HandlerType = __default_error_handler__
# pylint: disable=[redefined-outer-name]
) -> str:
"""Register success and error handlers for each job type."""
if not bool(app.config.get("background-jobs")):
app.config["background-jobs"] = {}
if not bool(app.config["background-jobs"].get(job_type)):
app.config["background-jobs"][job_type] = {
"success": success_handler,
"error": error_handler
}
return job_type
def register_job_handlers(job: dict):
"""Related to register handlers above."""
def __load_handler__(absolute_function_path):
_parts = absolute_function_path.split(".")
app.logger.debug("THE PARTS ARE: %s", _parts)
assert len(_parts) > 1, f"Invalid path: {absolute_function_path}"
module = importlib.import_module(f".{_parts[-2]}",
package=".".join(_parts[0:-2]))
return getattr(module, _parts[-1])
metadata = job["metadata"]
if metadata.get("success_handler"):
_success_handler = __load_handler__(metadata["success_handler"])
try:
_error_handler = __load_handler__(metadata["error_handler"])
except Exception as _exc:# pylint: disable=[broad-exception-caught]
_error_handler = __default_error_handler__
register_handlers(
metadata["job-type"], _success_handler, _error_handler)
def handler(job: dict, handler_type: str) -> HandlerType:
"""Fetch a handler for the job."""
_job_type = job["metadata"]["job-type"]
_handler = app.config.get(
"background-jobs", {}
).get(
_job_type, {}
).get(handler_type)
if bool(_handler):
return _handler(job)
def __default_success_handler__(_job):
return render_template(
"background-jobs/default-success-page.html", job=_job)
return __default_success_handler__
error_handler = partial(handler, handler_type="error")
success_handler = partial(handler, handler_type="success")
@background_jobs_bp.route("/status/<uuid:job_id>")
@require_login
def job_status(job_id: uuid.UUID):
"""View the job status."""
with sqlite3.connection(app.config["ASYNCHRONOUS_JOBS_SQLITE_DB"]) as conn:
try:
job = jobs.job(conn, job_id, fulldetails=True)
status = job["metadata"]["status"]
register_job_handlers(job)
if status in ("error", "stopped"):
return error_handler(job)
if status == "completed":
return success_handler(job)
return render_template("jobs/job-status.html", job=job)
except JobNotFound as _jnf:
return render_template("jobs/job-not-found.html", job_id=job_id)
@background_jobs_bp.route("/error/<uuid:job_id>")
@require_login
def job_error(job_id: uuid.UUID):
"""Handle job errors in a generic manner."""
with sqlite3.connection(app.config["ASYNCHRONOUS_JOBS_SQLITE_DB"]) as conn:
try:
job = jobs.job(conn, job_id, fulldetails=True)
return render_template("jobs/job-error.html", job=job)
except JobNotFound as _jnf:
return render_template("jobs/job-not-found.html", job_id=job_id)
def make_datetime_formatter(dtformat: str = "") -> str:
"""Make a datetime formatter with the provided `dtformat`"""
def __formatter__(val: str) -> str:
dt = datetime.datetime.fromisoformat(val)
return dt.strftime(dtformat.strip() or "%A, %d %B %Y at %H:%M %Z")
return __formatter__
@background_jobs_bp.route("/list")
@require_login
def list_jobs():
"""List background jobs."""
with sqlite3.connection(app.config["ASYNCHRONOUS_JOBS_SQLITE_DB"]) as conn:
return render_template(
"background-jobs/list-jobs.html",
jobs=jobs.jobs_by_external_id(
conn, session.user_details()["user_id"]),
display_datetime=make_datetime_formatter())
@background_jobs_bp.route("/summary/<uuid:job_id>")
@require_login
def job_summary(job_id: uuid.UUID):
"""Provide a summary for completed jobs."""
with sqlite3.connection(app.config["ASYNCHRONOUS_JOBS_SQLITE_DB"]) as conn:
try:
job = jobs.job(conn, job_id, fulldetails=True)
status = job["metadata"]["status"]
if status in ("completed", "error", "stopped"):
return render_template("background-jobs/job-summary.html",
job=job,
display_datetime=make_datetime_formatter())
return redirect(url_for(
"background-jobs.job_status", job_id=job["job_id"]))
except JobNotFound as _jnf:
return render_template("jobs/job-not-found.html", job_id=job_id)
@background_jobs_bp.route("/delete/<uuid:job_id>", methods=["GET", "POST"])
@require_login
def delete_single(job_id: uuid.UUID):
"""Delete a single job."""
with sqlite3.connection(app.config["ASYNCHRONOUS_JOBS_SQLITE_DB"]) as conn:
try:
job = jobs.job(conn, job_id, fulldetails=True)
status = job["metadata"]["status"]
if status not in ("completed", "error", "stopped"):
flash("We cannot delete a running job.", "alert alert-danger")
return redirect(url_for(
"background-jobs.job_summary", job_id=job_id))
if request.method == "GET":
return render_template("background-jobs/delete-job.html",
job=job,
display_datetime=make_datetime_formatter())
if request.form["btn-confirm-delete"] == "delete":
jobs.delete_job(conn, job_id)
flash("Job was deleted successfully.", "alert alert-success")
return redirect(url_for("background-jobs.list_jobs"))
flash("Delete cancelled.", "alert alert-info")
return redirect(url_for(
"background-jobs.job_summary", job_id=job_id))
except JobNotFound as _jnf:
return render_template("jobs/job-not-found.html", job_id=job_id)
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