Empty and reseed GeoServer GeoWebCache

GeoWebCacheService.py

import requests

class GeoWebCacheService(object):
    """Class to communicate with the geowebcache api.
    Api doco here: http://geowebcache.org/docs/current/rest/seed.html
    """
    _url = None
    _username = None
    _password = None
    
    def __init__(self, url, username, password):
        self._url = url
        self._username = username
        self._password = password
    
    def _get_seed_url(self, layer):
        if layer != None:
            layer = urllib.parse.quote(layer)
            url = urllib.parse.urljoin(self._url, "seed/%s.json" % layer)
        else:
            url = urllib.parse.urljoin(self._url, "seed.json")
        return url
    
    def get_tasks(self, layer=None):
        url = self._get_seed_url(layer)
        r = requests.get(url, auth=(self._username, self._password))
        j = r.json()
        return j["long-array-array"]
    
    def empty(self, layer):
        """Empty the cache for this layer.
        """
        url = self._get_seed_url(layer)
        
        # There isn't a simple Empty call in the API, so instead I'm doing a separate truncate on each of 
        # the caches that are defined by default in geoserver.
        grid_set_ids = ["EPSG:900913", "EPSG:4326"]
        formats = ["image/jpeg", "image/png"]
        for grid_set_id in grid_set_ids:
            for fmt in formats:
                data = {
                    "seedRequest": {
                        "type":"truncate",
                        "minX":[],
                        "minY":[],
                        "maxX":[],
                        "maxY":[],
                        "zoomStart":0,
                        "zoomStop":30,
                        "format":fmt,
                        "gridSetId":grid_set_id,
                        "threadCount":1
                    }
                }
                requests.post(url, auth=(self._username, self._password), json=data)

    # With help from https://gist.githubusercontent.com/alexgleith/844146bb24b4f22d856e/raw/2dd2351558bf0a7cc7a800cf8dc4d4c11100cba1/Seed-Truncate%2520Python
    def seed(self, layer):
        """Start seeding the given layer
        """  
        url = self._get_seed_url(layer)

        # Seed with the national map parameters
        data = {
            "seedRequest": {
                "type":"seed",
                "minX":[],
                "minY":[],
                "maxX":[],
                "maxY":[],
                "gridSetId":"EPSG:900913",
                "zoomStart":0,
                "zoomStop":10,
                "format":"image/png",
                "threadCount":4
            }
        }
    
        requests.post(url, auth=(self._username, self._password), json=data)