Scaleway inventory plugin: small improvements (#41642)

* scaleway inventory: token is mandatory

* scaleway inventory: mention exception in error

* scaleway inventory: remove print statement

* scaleway inventory: options don't need to be attr

* scaleway inventory: remove unused attr

lib/ansible/plugins/inventory/scaleway.py

@@ -24,6 +24,7 @@ DOCUMENTATION = '''
             description: Filter results on a specific tag
             type: list
         oauth_token:
+            required: True
             description: Scaleway OAuth token.
             env:
                 # in order of precedence
@@ -51,6 +52,7 @@ from ansible.errors import AnsibleError
 from ansible.plugins.inventory import BaseInventoryPlugin
 from ansible.module_utils.scaleway import SCALEWAY_LOCATION
 from ansible.module_utils.urls import open_url
+from ansible.module_utils._text import to_native
 
 
 def _fetch_information(token, url):
@@ -58,8 +60,8 @@ def _fetch_information(token, url):
         response = open_url(url,
                             headers={'X-Auth-Token': token,
                                      'Content-type': 'application/json'})
-    except Exception:
-        raise AnsibleError("Error while fetching %s" % url)
+    except Exception as e:
+        raise AnsibleError("Error while fetching %s: %s" % (url, to_native(e)))
 
     try:
         raw_json = json.loads(response.read())
@@ -79,12 +81,6 @@ def _build_server_url(api_endpoint):
 class InventoryModule(BaseInventoryPlugin):
     NAME = 'scaleway'
 
-    def __init__(self):
-        super(InventoryModule, self).__init__()
-
-        self.token = None
-        self.config_data = None
-
     def verify_file(self, path):
         return "scaleway" in path
 
@@ -103,39 +99,34 @@ class InventoryModule(BaseInventoryPlugin):
         self.inventory.set_variable(server_id, "tags", server_info["tags"])
         self.inventory.set_variable(server_id, "ipv4", server_info["public_ip"]["address"])
 
-    def _get_zones(self):
-        config_zones = self.get_option("regions")
+    def _get_zones(self, config_zones):
         return set(SCALEWAY_LOCATION.keys()).intersection(config_zones)
 
-    def _get_tags(self):
-        return self.get_option("tags")
-
-    def match_groups(self, server_info):
+    def match_groups(self, server_info, tags):
         server_zone = server_info["location"]["zone_id"]
         server_tags = server_info["tags"]
 
         # If no filtering is defined, all tags are valid groups
-        if self._get_tags() is None:
+        if tags is None:
             return set(server_tags).union((server_zone,))
 
-        matching_tags = set(server_tags).intersection(self._get_tags())
+        matching_tags = set(server_tags).intersection(tags)
 
         if not matching_tags:
             return set()
         else:
             return matching_tags.union((server_zone,))
 
-    def do_zone_inventory(self, zone):
+    def do_zone_inventory(self, zone, token, tags):
         self.inventory.add_group(zone)
         zone_info = SCALEWAY_LOCATION[zone]
 
         url = _build_server_url(zone_info["api_endpoint"])
-        all_servers = _fetch_information(url=url, token=self.token)
+        all_servers = _fetch_information(url=url, token=token)
 
         for server_info in all_servers:
 
-            groups = self.match_groups(server_info)
-            print(groups)
+            groups = self.match_groups(server_info, tags)
             server_id = server_info["id"]
 
             for group in groups:
@@ -145,8 +136,11 @@ class InventoryModule(BaseInventoryPlugin):
 
     def parse(self, inventory, loader, path, cache=True):
         super(InventoryModule, self).parse(inventory, loader, path)
-        self.config_data = self._read_config_data(path=path)
-        self.token = self.get_option("oauth_token")
+        self._read_config_data(path=path)
+
+        config_zones = self.get_option("regions")
+        tags = self.get_option("tags")
+        token = self.get_option("oauth_token")
 
-        for zone in self._get_zones():
-            self.do_zone_inventory(zone=zone)
+        for zone in self._get_zones(config_zones):
+            self.do_zone_inventory(zone=zone, token=token, tags=tags)