Feature | render CSV file with historical metrics value

mycroft_holmes/app/blueprints/dashboard/dashboard.py

@@ -1,6 +1,7 @@
 """
 Provides a blueprint that renders JSON with software version and environment details
 """
+from collections import defaultdict
 from csv import DictWriter
 from io import StringIO
 
@@ -155,12 +156,65 @@ def feature(feature_id):
         metrics=metrics,
         score=storage.get(feature_id, feature_metric='score'),
         the_latest_timestamp=storage.get_the_latest_timestamp(),
-        _csv='#',
+        _csv=url_for('dashboard.feature_csv', feature_id=feature_id),
         _json='#',
         _yaml=url_for('dashboard.feature_yaml', feature_id=feature_id),
     )
 
 
+@dashboard.route('/component/<string:feature_id>.csv')
+def feature_csv(feature_id):
+    """
+    :type feature_id str
+    :rtype: flask.Response
+    """
+    config = get_config()
+    feature_spec = get_feature_spec_by_id(config, feature_id)
+
+    # not found? return 404
+    if feature_spec is None:
+        abort(404, 'Feature "%s" not found' % (feature_id,))
+
+    # get all names of all metrics
+    metrics = ['score'] + sorted([
+        metric.get_name()
+        for metric in config.get_metrics_for_feature(feature_spec['name'])
+    ])
+
+    storage = MetricsStorage(config=config)
+    values = defaultdict(dict)
+
+    # "merge" different metrics from the same day into CSV per-day rows
+    for row in storage.get_feature_metrics_history(feature_id):
+        date = str(row['date'])
+        metric_name = row['metric']
+        metric_value = row['value']
+
+        # avoid: ValueError: dict contains fields not in fieldnames: 'analytics/events'
+        if metric_name in metrics:
+            values[date][metric_name] = metric_value
+
+    # https://docs.python.org/3.6/library/csv.html#writer-objects
+    output = StringIO()
+
+    csv = DictWriter(
+        f=output,
+        fieldnames=['date'] + metrics
+    )
+
+    csv.writeheader()
+
+    # write CSV rows
+    for date, row in values.items():
+        row.update({"date": date})
+        csv.writerow(row)
+
+    resp = make_response(output.getvalue())
+    resp.headers['Content-Type'] = 'text/plain'
+
+    return resp
+
+
 @dashboard.route('/component/<string:feature_id>.yaml')
 def feature_yaml(feature_id):
     """

mycroft_holmes/app/blueprints/dashboard/templates/feature.html

@@ -10,8 +10,8 @@
        <div class="container-fluid">
 
             <div class="float-right">
-                <!--<a href="{{ _csv | e }}" class="badge badge-secondary">CSV</a>
-                <a href="{{ _json | e }}" class="badge badge-secondary">JSON</a>-->
+                <a href="{{ _csv | e }}" class="badge badge-secondary">CSV</a>
+                <!--<a href="{{ _json | e }}" class="badge badge-secondary">JSON</a>-->
                 <a href="{{ _yaml | e }}" class="badge badge-secondary">YAML</a>
             </div>
 

mycroft_holmes/storage.py

@@ -164,3 +164,26 @@ def get_the_latest_timestamp(self):
         except MySqlError as ex:
             self.logger.error('Storage error occured: %s', ex)
             return None
+
+    def get_feature_metrics_history(self, feature__id):
+        """
+        Yields the historical values of all metrics for a given feature
+
+        :type feature__id str
+        :rtype: list[dict]
+        """
+        cursor = self.storage.cursor()
+
+        cursor.execute(
+            "SELECT /* mycroft_holmes */ DATE(timestamp) AS date, metric, value "
+            "FROM features_metrics WHERE feature = %(feature)s GROUP BY date, metric",
+            {
+                'feature': feature__id
+            }
+        )
+
+        for row in iter(cursor):
+            yield dict(zip(
+                ('date', 'metric', 'value'),
+                row
+            ))