Generate and use UID for acessing dashboards

We are relying on the "slug" field being the same as our "url
friendly" title that we create.  For whatever reason the slug field
was deprecated in Grafana v5.0, and now with v8.3.4 it has stopped
working.

We can turn the name/slug into a UID by hashing, and then use this in
the various API calls.

Change-Id: I13d3162c917e094684756e51836d12000621fefa

grafana_dashboards/grafana/dashboard.py

@@ -12,6 +12,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+import hashlib
 import json
 
 from requests import exceptions
@@ -22,9 +23,13 @@ from grafana_dashboards.grafana import utils
 class Dashboard(object):
 
     def __init__(self, url, session):
-        self.url = utils.urljoin(url, 'api/dashboards/db/')
+        self.db_url = utils.urljoin(url, 'api/dashboards/db/')
+        self.uid_url = utils.urljoin(url, 'api/dashboards/uid/')
         self.session = session
 
+    def dashboard_uid(self, name):
+        return hashlib.sha256(name.encode('utf-8')).hexdigest()[0:10]
+
     def create(self, name, data, overwrite=False, folder_id=0):
         """Create a new dashboard
 
@@ -41,6 +46,8 @@ class Dashboard(object):
         :raises Exception: if dashboard already exists
 
         """
+        uid = self.dashboard_uid(name)
+        data['uid'] = uid
         dashboard = {
             'dashboard': data,
             'folderId': folder_id,
@@ -50,7 +57,7 @@ class Dashboard(object):
             raise Exception('dashboard[%s] already exists' % name)
 
         res = self.session.post(
-            self.url, data=json.dumps(dashboard))
+            self.db_url, data=json.dumps(dashboard))
         res.raise_for_status()
         if not self.is_dashboard(name):
             raise Exception('dashboard[%s] does not exist' % name)
@@ -64,10 +71,12 @@ class Dashboard(object):
         :raises Exception: if dashboard failed to delete
 
         """
-        url = utils.urljoin(self.url, name)
+        uid = self.dashboard_uid(name)
+        url = utils.urljoin(self.uid_url, uid)
         self.session.delete(url)
         if self.is_dashboard(name):
-            raise Exception('dashboard[%s] failed to delete' % name)
+            raise Exception(
+                'dashboard %s (uid: %s) failed to delete' % (name, uid))
 
     def get(self, name):
         """Get a dashboard
@@ -78,14 +87,15 @@ class Dashboard(object):
         :rtype: dict or None
 
         """
-        url = utils.urljoin(self.url, name)
+        url = utils.urljoin(self.uid_url, self.dashboard_uid(name))
         try:
             res = self.session.get(url)
             res.raise_for_status()
         except exceptions.HTTPError:
             return None
 
-        return res.json()
+        json = res.json()
+        return json if json else None
 
     def is_dashboard(self, name):
         """Check if a dashboard exists
@@ -98,6 +108,4 @@ class Dashboard(object):
 
         """
         res = self.get(name)
-        if res and res['meta']['slug'] == name:
-            return True
-        return False
+        return True if res else False

tests/test_grafana.py

@@ -13,6 +13,7 @@
 # under the License.
 
 import requests_mock
+import re
 from testtools import TestCase
 
 from grafana_dashboards.grafana import Grafana
@@ -39,6 +40,8 @@ DASHBOARD_NOT_FOUND = {
     "message": "Dashboard not found"
 }
 
+UID_URL_MATCHER = re.compile(r'api/dashboards/uid/[a-fA-F\d]{10}')
+
 
 class TestCaseGrafana(TestCase):
 
@@ -61,14 +64,12 @@ class TestCaseGrafana(TestCase):
     @requests_mock.Mocker()
     def test_create_dashboard_new(self, mock_requests):
         def post_callback(request, context):
-            mock_requests.get(
-                '/api/dashboards/db/new-dashboard', json=CREATE_NEW_DASHBOARD)
+            mock_requests.get(UID_URL_MATCHER, json=CREATE_NEW_DASHBOARD)
             return True
 
         mock_requests.post('/api/dashboards/db/', json=post_callback)
         mock_requests.get(
-            '/api/dashboards/db/new-dashboard', json=DASHBOARD_NOT_FOUND,
-            status_code=404)
+            UID_URL_MATCHER, json=DASHBOARD_NOT_FOUND, status_code=404)
 
         data = {
             "dashboard": {
@@ -83,8 +84,7 @@ class TestCaseGrafana(TestCase):
     @requests_mock.Mocker()
     def test_create_dashboard_overwrite(self, mock_requests):
         mock_requests.post('/api/dashboards/db/')
-        mock_requests.get(
-            '/api/dashboards/db/new-dashboard', json=CREATE_NEW_DASHBOARD)
+        mock_requests.get(UID_URL_MATCHER, json=CREATE_NEW_DASHBOARD)
         data = {
             "dashboard": {
                 "title": "New dashboard",
@@ -98,8 +98,7 @@ class TestCaseGrafana(TestCase):
     @requests_mock.Mocker()
     def test_create_dashboard_existing(self, mock_requests):
         mock_requests.post('/api/dashboards/db/')
-        mock_requests.get(
-            '/api/dashboards/db/new-dashboard', json=CREATE_NEW_DASHBOARD)
+        mock_requests.get(UID_URL_MATCHER, json=CREATE_NEW_DASHBOARD)
         data = {
             "dashboard": {
                 "title": "New dashboard",
@@ -114,10 +113,9 @@ class TestCaseGrafana(TestCase):
 
     @requests_mock.Mocker()
     def test_delete_dashboard(self, mock_requests):
-        mock_requests.delete('/api/dashboards/db/new-dashboard')
+        mock_requests.delete(UID_URL_MATCHER)
         mock_requests.get(
-            '/api/dashboards/db/new-dashboard', json=DASHBOARD_NOT_FOUND,
-            status_code=404)
+            UID_URL_MATCHER, json=DASHBOARD_NOT_FOUND, status_code=404)
         self.grafana.dashboard.delete('new-dashboard')
 
     @requests_mock.Mocker()