Merge pull request #70 from drakaru/alt

allow loading jinja templates from filesystem

docs/source/elastalert.rst

@@ -220,6 +220,8 @@ The default value is ``.raw`` for Elasticsearch 2 and ``.keyword`` for Elasticse
 
 ``jinja_root_name``: When using a Jinja template, specify the name of the root field name in the template. The default is ``_data``.
 
+``jinja_template_path``: When using a Jinja template, specify filesystem path to template, this overrides the default behaviour of using alert_text as the template.
+
 Logging
 -------
 

elastalert/loaders.py

@@ -9,6 +9,8 @@
 import yaml
 import yaml.scanner
 from jinja2 import Template
+from jinja2 import Environment
+from jinja2 import FileSystemLoader
 from staticconf.loader import yaml_loader
 
 from . import alerts
@@ -95,6 +97,8 @@ class RulesLoader(object):
 
     base_config = {}
 
+    jinja_environment = Environment(loader=FileSystemLoader(""))
+
     def __init__(self, conf):
         # schema for rule yaml
         self.rule_schema = jsonschema.Draft7Validator(
@@ -401,7 +405,11 @@ def _dt_to_ts_with_format(dt):
 
         # Compile Jinja Template
         if rule.get('alert_text_type') == 'alert_text_jinja':
-            rule["jinja_template"] = Template(str(rule.get('alert_text', '')))
+            jinja_template_path = rule.get('jinja_template_path')
+            if jinja_template_path:
+                rule["jinja_template"] = self.jinja_environment.get_or_select_template(jinja_template_path)
+            else:
+                rule["jinja_template"] = Template(str(rule.get('alert_text', '')))
 
     def load_modules(self, rule, args=None):
         """ Loads things that could be modules. Enhancements, alerts and rule type. """