Reorganize connections into drivers

This change, while substantial, is mostly organizational.
Currently, connections, sources, triggers, and reporters are
discrete concepts, and yet are related by virtue of the fact that
the ConnectionRegistry is used to instantiate each of them.  The
method used to instantiate them is called "_getDriver", in
recognition that behind each "trigger", etc., which appears in
the config file, there is a class in the zuul.trigger hierarchy
implementing the driver for that trigger.  Connections also
specify a "driver" in the config file.

In this change, we redefine a "driver" as a single class that
organizes related connections, sources, triggers and reporters.

The connection, source, trigger, and reporter interfaces still
exist.  A driver class is responsible for indicating which of
those interfaces it supports and instantiating them when asked to
do so.

Zuul instantiates a single instance of each driver class it knows
about (currently hardcoded, but in the future, we will be able to
easily ask entrypoints for these).  That instance will be
retained for the life of the Zuul server process.

When Zuul is (re-)configured, it asks the driver instances to
create new connection, source, trigger, reporter instances as
necessary.  For instance, a user may specify a connection that
uses the "gerrit" driver, and the ConnectionRegistry would call
getConnection() on the Gerrit driver instance.

This is done for two reasons: first, it allows us to organize all
of the code related to interfacing with an external system
together.  All of the existing connection, source, trigger, and
reporter classes are moved as follows:

  zuul.connection.FOO -> zuul.driver.FOO.FOOconnection
  zuul.source.FOO -> zuul.driver.FOO.FOOsource
  zuul.trigger.FOO -> zuul.driver.FOO.FOOtrigger
  zuul.reporter.FOO -> zuul.driver.FOO.FOOreporter

For instance, all of the code related to interfacing with Gerrit
is now is zuul.driver.gerrit.

Second, the addition of a single, long-lived object associated
with each of these systems allows us to better support some types
of interfaces.  For instance, the Zuul trigger maintains a list
of events it is required to emit -- this list relates to a tenant
as a whole rather than individual pipelines or triggers.  The
timer trigger maintains a single scheduler instance for all
tenants, but must be able to add or remove cron jobs based on an
individual tenant being reconfigured.  The global driver instance
for each of these can be used to accomplish this.

As a result of using the driver interface to create new
connection, source, trigger and reporter instances, the
connection setup in ConnectionRegistry is much simpler, and can
easily be extended with entrypoints in the future.

The existing tests of connections, sources, triggers, and
reporters which only tested that they could be instantiated and
have names have been removed, as there are functional tests which
cover them.

Change-Id: Ib2f7297d81f7a003de48f799dc1b09e82d4894bc

zuul/driver/smtp/__init__.py

@@ -0,0 +1,29 @@
+# Copyright 2016 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import smtpconnection
+import smtpreporter
+
+
+class SMTPDriver(object):
+    name = 'smtp'
+
+    def getConnection(self, name, config):
+        return smtpconnection.SMTPConnection(self, name, config)
+
+    def getReporter(self, connection, config=None):
+        return smtpreporter.SMTPReporter(self, connection, config)
+
+    def getReporterSchema(self):
+        return smtpreporter.getSchema()

zuul/driver/smtp/smtpconnection.py

@@ -0,0 +1,62 @@
+# Copyright 2014 Rackspace Australia
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import logging
+import voluptuous as v
+import smtplib
+
+from email.mime.text import MIMEText
+
+from zuul.connection import BaseConnection
+
+
+class SMTPConnection(BaseConnection):
+    driver_name = 'smtp'
+    log = logging.getLogger("connection.smtp")
+
+    def __init__(self, driver, connection_name, connection_config):
+        super(SMTPConnection, self).__init__(driver, connection_name,
+                                             connection_config)
+
+        self.smtp_server = self.connection_config.get(
+            'server', 'localhost')
+        self.smtp_port = self.connection_config.get('port', 25)
+        self.smtp_default_from = self.connection_config.get(
+            'default_from', 'zuul')
+        self.smtp_default_to = self.connection_config.get(
+            'default_to', 'zuul')
+
+    def sendMail(self, subject, message, from_email=None, to_email=None):
+        # Create a text/plain email message
+        from_email = from_email \
+            if from_email is not None else self.smtp_default_from
+        to_email = to_email if to_email is not None else self.smtp_default_to
+
+        msg = MIMEText(message)
+        msg['Subject'] = subject
+        msg['From'] = from_email
+        msg['To'] = to_email
+
+        try:
+            s = smtplib.SMTP(self.smtp_server, self.smtp_port)
+            s.sendmail(from_email, to_email.split(','), msg.as_string())
+            s.quit()
+        except:
+            return "Could not send email via SMTP"
+        return
+
+
+def getSchema():
+    smtp_connection = v.Any(str, v.Schema({}, extra=True))
+    return smtp_connection

zuul/driver/smtp/smtpreporter.py

@@ -0,0 +1,55 @@
+# Copyright 2013 Rackspace Australia
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import logging
+import voluptuous as v
+
+from zuul.reporter import BaseReporter
+
+
+class SMTPReporter(BaseReporter):
+    """Sends off reports to emails via SMTP."""
+
+    name = 'smtp'
+    log = logging.getLogger("zuul.reporter.smtp.Reporter")
+
+    def report(self, source, pipeline, item):
+        """Send the compiled report message via smtp."""
+        message = self._formatItemReport(pipeline, item)
+
+        self.log.debug("Report change %s, params %s, message: %s" %
+                       (item.change, self.config, message))
+
+        from_email = self.config['from'] \
+            if 'from' in self.config else None
+        to_email = self.config['to'] \
+            if 'to' in self.config else None
+
+        if 'subject' in self.config:
+            subject = self.config['subject'].format(
+                change=item.change)
+        else:
+            subject = "Report for change %s" % item.change
+
+        self.connection.sendMail(subject, message, from_email, to_email)
+
+
+def getSchema():
+    smtp_reporter = v.Schema({
+        'connection': str,
+        'to': str,
+        'from': str,
+        'subject': str,
+    })
+    return smtp_reporter