Read settings from environment variables instead of a settings file.

This is mostly done to make it easier to run re:dash on Heroku but should be convenient in other platforms too.

.gitignore

@@ -2,11 +2,11 @@
 .idea
 *.pyc
 .coverage
-redash/settings.py
 rd_ui/dist
 .DS_Store
 
 # Vagrant related
 .vagrant
 Berksfile.lock
 redash/dump.rdb
+.env

redash/settings.py

@@ -0,0 +1,44 @@
+import os
+import urlparse
+
+
+def parse_db_url(url):
+    url_parts = urlparse.urlparse(url)
+    connection = {
+        'engine': 'peewee.PostgresqlDatabase',
+    }
+
+    if url_parts.hostname and not url_parts.path:
+        connection['name'] = url_parts.hostname
+    else:
+        connection['name'] = url_parts.path[1:]
+        connection['host'] = url_parts.hostname
+        connection['port'] = url_parts.port
+        connection['user'] = url_parts.username
+        connection['password'] = url_parts.password
+
+    return connection
+
+REDIS_URL = os.environ.get('REDASH_REDIS_URL', "redis://localhost:6379")
+
+# "pg", "graphite" or "mysql"
+CONNECTION_ADAPTER = os.environ.get("REDASH_CONNECTION_ADAPTER", "pg")
+# Connection string for the database that is used to run queries against. Examples:
+# -- mysql:    CONNECTION_STRING = "Server=;User=;Pwd=;Database="
+# -- pg:       CONNECTION_STRING = "user= password= host= port=5439 dbname="
+# -- graphite: CONNECTION_STRING = {'url': 'https://graphite.yourcompany.com', 'auth': ('user', 'password'), 'verify': True}
+CONNECTION_STRING = os.environ.get("REDASH_CONNECTION_STRING", "user= password= host= port=5439 dbname=")
+
+# Connection settings for re:dash's own database (where we store the queries, results, etc)
+DATABASE_CONFIG = parse_db_url(os.environ.get("REDASH_DATABASE_URL", "postgresql://postgres"))
+
+# Google Apps domain to allow access from; any user with email in this Google Apps will be allowed
+# access
+GOOGLE_APPS_DOMAIN = os.environ.get("REDASH_GOOGLE_APPS_DOMAIN", "")
+# Email addresses of admin users (comma separated)
+ADMINS = os.environ.get("REDASH_ADMINS", '').split(',')
+STATIC_ASSETS_PATH = os.environ.get("REDASH_STATIC_ASSETS_PATH", "../rd_ui/dist/")
+WORKERS_COUNT = int(os.environ.get("REDASH_WORKERS_COUNT", "2"))
+COOKIE_SECRET = os.environ.get("REDASH_COOKIE_SECRET", "c292a0a3aa32397cdb050e233733900f")
+LOG_LEVEL = os.environ.get("REDASH_LOG_LEVEL", "INFO")
+ANALYTICS = os.environ.get("REDASH_ANALYTICS", "")

tests/test_settings.py

@@ -0,0 +1,27 @@
+from redash import settings as settings
+from unittest import TestCase
+
+
+class TestDatabaseUrlParser(TestCase):
+    def test_only_database_name(self):
+        config = settings.parse_db_url("postgresql://postgres")
+        self.assertEquals(config['name'], 'postgres')
+
+    def test_host_and_database_name(self):
+        config = settings.parse_db_url("postgresql://localhost/postgres")
+        self.assertEquals(config['name'], 'postgres')
+        self.assertEquals(config['host'], 'localhost')
+
+    def test_host_with_port_and_database_name(self):
+        config = settings.parse_db_url("postgresql://localhost:5432/postgres")
+        self.assertEquals(config['name'], 'postgres')
+        self.assertEquals(config['host'], 'localhost')
+        self.assertEquals(config['port'], 5432)
+
+    def test_full_url(self):
+        config = settings.parse_db_url("postgresql://user:pass@localhost:5432/postgres")
+        self.assertEquals(config['name'], 'postgres')
+        self.assertEquals(config['host'], 'localhost')
+        self.assertEquals(config['port'], 5432)
+        self.assertEquals(config['user'], 'user')
+        self.assertEquals(config['password'], 'pass')