Add generic templating to outputs formats, add kubezero custom hook

CHANGES.md

@@ -4,9 +4,17 @@
 New Features:  
 
 - *Hooks* can now be defined as artifact metadata and are executed at the specified step.  
-  Current supported hooks are: `pre_create, pre_update, post_create, post_update`
-- Stack *Outputs* are now written into a yaml file under `outputs` if enabled. Enabled via `options.StoreOutputs`
+  Current supported hook entrypoints are: `pre_create, pre_update, post_create, post_update`
+
+    Current implemented hooks:  
+
+    - *cmd*: Allows arbritary commands via subprocess
+    - *export_outputs_kubezero*: writes the outputs of kubernetes stacks into a format to be included by KubeZero
+
+- Stack outputs are now written into a yaml file under `outputs` if enabled. Enabled via `options.StoreOutputs`  
+  *create-docs* now includes latest stack output values if an output file is found
 - Removed deprecated support for storing parameters as these can be constructed any time from existing and tracked configs  
+
 - some code cleanups and minor changes for cli outputs
 
 ## 0.8.4

cloudbender/hooks.py

@@ -46,4 +46,4 @@ def cmd(stack, arguments):
 def export_outputs_kubezero(stack, arguments):
     """ Write outputs in yaml for kubezero helm chart """
 
-    logger.info(stack.outputs)
+    stack.write_outputs_file(template='kubezero.yaml', filename='kubezero.yaml')

cloudbender/stack.py

@@ -270,13 +270,17 @@ class Stack(object):
         """ Reads rendered yaml template from disk and extracts metadata """
         if not self.cfn_template:
             yaml_file = os.path.join(self.ctx['template_path'], self.rel_path, self.stackname + ".yaml")
-            with open(yaml_file, 'r') as yaml_contents:
-                self.cfn_template = yaml_contents.read()
-                logger.debug('Read cfn template %s.', yaml_file)
 
-            self.cfn_data = yaml.safe_load(self.cfn_template)
-            self._parse_metadata()
+            try:
+                with open(yaml_file, 'r') as yaml_contents:
+                    self.cfn_template = yaml_contents.read()
+                    logger.debug('Read cfn template %s.', yaml_file)
 
+                self.cfn_data = yaml.safe_load(self.cfn_template)
+                self._parse_metadata()
+            except FileNotFoundError as e:
+                logger.warn("Could not find template file: {}".format(yaml_file))
+                raise e
         else:
             logger.debug('Using cached cfn template %s.', self.stackname)
 
@@ -333,18 +337,30 @@ class Stack(object):
             except KeyError:
                 pass
 
-        except ClientError as e:
-            raise e
+        except ClientError:
+            logger.warn("Could not get outputs of {}".format(self.stackname))
+            pass
 
-        logger.info('{} {} Outputs:\n{}'.format(self.region, self.stackname, pprint.pformat(self.outputs, indent=2)))
+        if self.outputs:
+            logger.info('{} {} Outputs:\n{}'.format(self.region, self.stackname, pprint.pformat(self.outputs, indent=2)))
+            if self.store_outputs:
+                self.write_outputs_file()
+
+    def write_outputs_file(self, template='outputs.yaml', filename=False):
+        if not filename:
+            output_file = os.path.join(self.ctx['outputs_path'], self.rel_path, self.stackname + ".yaml")
+        else:
+            output_file = os.path.join(self.ctx['outputs_path'], self.rel_path, filename)
 
-    def write_outputs_file(self):
-        output_file = os.path.join(self.ctx['outputs_path'], self.rel_path, self.stackname + ".yaml")
         ensure_dir(os.path.join(self.ctx['outputs_path'], self.rel_path))
 
-        # Render outputs as yaml under top level key "Outputs"
+        my_template = pkg_resources.read_text(templates, template)
+        jenv = JinjaEnv()
+        template = jenv.from_string(my_template)
+        data = {'stackname': "/".join([self.rel_path, self.stackname]), 'timestamp': datetime.now(tzutc()), 'outputs': self.outputs}
+
         with open(output_file, 'w') as output_contents:
-            output_contents.write(yaml.dump({'Outputs': self.outputs}))
+            output_contents.write(template.render(**data))
             logger.info('Wrote outputs for %s to %s', self.stackname, output_file)
 
     def create_docs(self, template=False):
@@ -353,7 +369,10 @@ class Stack(object):
             same idea as eg. helm-docs for values.yaml
          """
 
-        self.read_template_file()
+        try:
+            self.read_template_file()
+        except FileNotFoundError:
+            return
 
         if not template:
             doc_template = pkg_resources.read_text(templates, 'stack-doc.md')
@@ -373,7 +392,19 @@ class Stack(object):
         if 'Outputs' in self.cfn_data:
             data['outputs'] = self.cfn_data['Outputs']
 
-        doc_file = os.path.join(self.ctx['docs_path'], self.rel_path, self.stackname.upper() + ".md")
+            # Check for existing outputs yaml, if found add current value column and set header to timestamp from outputs file
+            output_file = os.path.join(self.ctx['outputs_path'], self.rel_path, self.stackname + ".yaml")
+
+            try:
+                with open(output_file, 'r') as yaml_contents:
+                    outputs = yaml.safe_load(yaml_contents.read())
+                    for p in outputs['Outputs']:
+                        data['outputs'][p]['last_value'] = outputs['Outputs'][p]
+                    data['timestamp'] = outputs['TimeStamp']
+            except (FileNotFoundError, KeyError):
+                pass
+
+        doc_file = os.path.join(self.ctx['docs_path'], self.rel_path, self.stackname + ".md")
         ensure_dir(os.path.join(self.ctx['docs_path'], self.rel_path))
 
         with open(doc_file, 'w') as doc_contents:
@@ -436,7 +467,6 @@ class Stack(object):
 
         # Prepare parameters
         self.resolve_parameters()
-        # self.write_parameter_file()
         self.read_template_file()
 
         logger.info('Creating {0} {1}'.format(self.region, self.stackname))
@@ -454,9 +484,6 @@ class Stack(object):
         status = self._wait_for_completion()
         self.get_outputs()
 
-        if self.store_outputs:
-            self.write_outputs_file()
-
         return status
 
     @exec_hooks
@@ -465,7 +492,6 @@ class Stack(object):
 
         # Prepare parameters
         self.resolve_parameters()
-        # self.write_parameter_file()
         self.read_template_file()
 
         logger.info('Updating {0} {1}'.format(self.region, self.stackname))
@@ -490,9 +516,6 @@ class Stack(object):
         status = self._wait_for_completion()
         self.get_outputs()
 
-        if self.store_outputs:
-            self.write_outputs_file()
-
         return status
 
     @exec_hooks
@@ -512,7 +535,6 @@ class Stack(object):
 
         # Prepare parameters
         self.resolve_parameters()
-        # self.write_parameter_file()
         self.read_template_file()
 
         logger.info('Creating change set {0} for stack {1}'.format(change_set_name, self.stackname))

cloudbender/templates/kubezero.yaml

@@ -0,0 +1,11 @@
+---
+# Source: CloudBender for stack {{ stackname }} at {{ timestamp }}
+cert-manager:
+  IamArn: {{ outputs.CertManagerRoleArn }}
+
+kiam:
+  IamArn: {{ outputs.KiamServerRoleArn }}
+
+aws-ebs-csi-driver:
+  IamArn: {{ outputs.EbsCsiDriverRoleArn }}
+

cloudbender/templates/outputs.yaml

@@ -0,0 +1,6 @@
+StackName: {{ stackname }}
+TimeStamp: {{ timestamp }}
+Outputs:
+{% for p in outputs %}
+  {{ p }}: {{ outputs[p] }}
+{% endfor %}

cloudbender/templates/stack-doc.md

@@ -28,9 +28,9 @@
 
 {% if outputs %}
 ## Outputs
-| Output | Description |
-|--------|-------------|
-{% for p in outputs.keys() %}
-| {{ p }} | {{ outputs[p]['Description'] }} |
+| Output | Description | Value as of {{ timestamp }} |
+|--------|-------------|-----------------------------|
+{% for p in outputs.keys() | sort%}
+| {{ p }} | {{ outputs[p]['Description'] }} | {{ outputs[p]['last_value'] }} |
 {% endfor %}
 {% endif %}