From cc484b629e6e3ee6480a296204a965fdc2f4e55a Mon Sep 17 00:00:00 2001
From: Ivan Vanderbyl <ivanvanderbyl@me.com>
Date: Fri, 30 Aug 2013 12:20:57 +1000
Subject: [PATCH] Added LogEntries module

---
 library/monitoring/logentries | 130 ++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 library/monitoring/logentries

diff --git a/library/monitoring/logentries b/library/monitoring/logentries
new file mode 100644
index 0000000000..480ab9954d
--- /dev/null
+++ b/library/monitoring/logentries
@@ -0,0 +1,130 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# (c) 2013, Ivan Vanderbyl <ivan@app.io>
+#
+# This module is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This software is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this software.  If not, see <http://www.gnu.org/licenses/>.
+
+DOCUMENTATION = '''
+---
+module: logentries
+author: Ivan Vanderbyl
+short_description: Log aggregation service
+description:
+    - Sends logs to LogEntries in realtime
+version_added: "1.0"
+options:
+    path:
+        description:
+            - path to a log file
+        required: true
+    state:
+        description:
+            - following state of the log
+        choices: [ 'present', 'absent' ]
+        required: false
+        default: present
+notes:
+    - Requires the LogEntries agent which can be installed following the instructions at logentires.com
+'''
+EXAMPLES = '''
+- logentries: path=/var/log/nginx/access.log state=present
+- logentries: path=/var/log/nginx/error.log state=absent
+'''
+
+def query_log_status(module, le_path, path, state="present"):
+    """ Returns whether a log is followed or not. """
+
+    if state == "present":
+        rc, out, err = module.run_command("%s followed %s" % (le_path, path))
+        if rc == 0:
+            return True
+
+        return False
+
+def follow_log(module, le_path, logs):
+    """ Follows one or more logs if not already followed. """
+
+    followed_count = 0
+
+    for log in logs:
+        if query_log_status(module, le_path, log):
+            continue
+
+        if module.check_mode:
+            module.exit_json(changed=True)
+        rc, out, err = module.run_command([le_path, 'follow', log])
+
+        if not query_log_status(module, le_path, log):
+            module.fail_json(msg="failed to follow '%s': %s" % (log, out.strip()))
+
+        followed_count += 1
+
+    if followed_count > 0:
+        module.exit_json(changed=True, msg="followed %d log(s)" % (followed_count,))
+
+    module.exit_json(changed=False, msg="logs(s) already followed")
+
+def unfollow_log(module, le_path, logs):
+    """ Unfollows one or more logs if followed. """
+
+    removed_count = 0
+
+    # Using a for loop incase of error, we can report the package that failed
+    for log in logs:
+        # Query the log first, to see if we even need to remove.
+        if not query_log_status(module, le_path, log):
+            continue
+
+        if module.check_mode:
+            module.exit_json(changed=True)
+        rc, out, err = module.run_command([le_path, 'unfollow', log])
+
+        if query_log_status(module, le_path, log):
+            module.fail_json(msg="failed to remove '%s': %s" % (log, out.strip()))
+
+        removed_count += 1
+
+    if removed_count > 0:
+        module.exit_json(changed=True, msg="removed %d package(s)" % removed_count)
+
+    module.exit_json(changed=False, msg="logs(s) already unfollowed")
+
+def main():
+    module = AnsibleModule(
+        argument_spec = dict(
+            path = dict(aliases=["name"], required=True),
+            state = dict(default="present", choices=["present", "followed", "absent", "unfollowed"])
+        ),
+        supports_check_mode=True
+    )
+
+    le_path = module.get_bin_path('le', True, ['/usr/local/bin'])
+
+    p = module.params
+
+    # Handle multiple log files
+    logs = p["path"].split(",")
+    logs = filter(None, logs)
+
+    if p["state"] in ["present", "followed"]:
+        follow_log(module, le_path, logs)
+
+    elif p["state"] in ["absent", "unfollowed"]:
+        unfollow_log(module, le_path, logs)
+
+# this is magic, see lib/ansible/module_common.py
+#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
+
+main()