From d1b1cf62e613390845e9f97f8cb38d1af20618ef Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Sun, 16 Apr 2017 16:37:33 +0300
Subject: Turn backend into a cliapp application

This will make it easier to use from a systemd unit.
---
 distix-backend | 74 +++++++++++++++++++++++++++++++++++++++-------------------
 yarns/900.yarn |  5 +++-
 2 files changed, 54 insertions(+), 25 deletions(-)

diff --git a/distix-backend b/distix-backend
index ea621c0..3172a5e 100755
--- a/distix-backend
+++ b/distix-backend
@@ -7,6 +7,7 @@ import sys
 import yaml
 
 import bottle
+import cliapp
 
 import distixapi
 
@@ -16,10 +17,13 @@ class AuthenticationPlugin(object):
 
     name = 'AuthenticationPlugin'
 
+    def __init__(self, users):
+        self._users = users
+
     def apply(self, callback, route):
         def authorize(*args, **kwargs):
             try:
-                scopes = distixapi.get_scopes(users, bottle.request)
+                scopes = distixapi.get_scopes(self._users, bottle.request)
             except distixapi.AuthenticationError:
                 return bottle.abort(401, 'Unauthorized')
             if route['method'].lower() not in scopes:
@@ -28,39 +32,61 @@ class AuthenticationPlugin(object):
         return authorize
 
 
-@bottle.route('/')
-def root():
-    return 'This is the root'
+class API(object):
+
+    def __init__(self, users):
+        self.app = bottle.Bottle()
+        self.app.install(AuthenticationPlugin(users))
+        self.app.route('/version', method='GET', callback=self.version)
 
-@bottle.route('/version')
-def version():
-    return { 'version': '1.0' }
+    def run(self, port):
+        self.app.run(port=port)
 
+    def version(self):
+        return { 'version': '1.0' }
 
-# Command line args.
 
-pid_file = sys.argv[1]
-port_file = sys.argv[2]
-users_file = sys.argv[3]
+class DistixBackend(cliapp.Application):
 
+    def add_settings(self):
+        self.settings.string(
+            ['port-file'],
+            'pick random ports, write to FILE',
+            metavar='FILE')
 
+        self.settings.string(
+            ['pid-file'],
+            'write pid to FILE',
+            metavar='FILE')
 
-log_file = open('log', 'a')
-def log(msg):
-    log_file.write('{} {}\n'.format(os.getpid(), msg))
-    log_file.flush()
+        self.settings.string(
+            ['users-file'],
+            'read users list from FILE',
+            metavar='FILE')
 
+    def process_args(self, args):
+        users = self.read_user_file()
+        port = self.pick_random_port()
+        self.write_pid_file()
+        api = API(users)
+        api.run(port)
 
-# Write pid to named file.
+    def read_user_file(self):
+        filename = self.settings['users-file']
+        if os.path.exists(filename):
+            with open(filename) as f:
+                return yaml.safe_load(f)
 
-with open(pid_file, 'w') as f:
-    f.write('{}\n'.format(os.getpid()))
+    def pick_random_port(self):
+        port = random.randint(1025, 32767)
+        with open(self.settings['port-file'], 'w') as f:
+            f.write('{}\n'.format(port))
+        return port
 
+    def write_pid_file(self):
+        filename = self.settings['pid-file']
+        with open(filename, 'w') as f:
+            f.write('{}\n'.format(os.getpid()))
 
-# Pick a random port and write it to named file.
-port = random.randint(1025, 32767)
-with open(port_file, 'w') as f:
-    f.write('{}\n'.format(port))
 
-users = yaml.safe_load(open(users_file))
-bottle.run(port=port, quiet=True, plugins=[AuthenticationPlugin()])
+DistixBackend(version=distixapi.__version__).run()
diff --git a/yarns/900.yarn b/yarns/900.yarn
index 5d11865..a41a558 100644
--- a/yarns/900.yarn
+++ b/yarns/900.yarn
@@ -18,7 +18,10 @@
     IMPLEMENTS GIVEN a running backend instance
     backend = os.path.join(srcdir, 'distix-backend')
     cliapp.runcmd(
-        ['/usr/sbin/daemonize', '-c.', backend, 'pid', 'port', 'users.yaml'])
+        ['/usr/sbin/daemonize', '-c', datadir,
+         backend, '--pid-file', 'pid', '--port-file', 'port',
+         '--log', 'distix-backend.log',
+         '--users-file', 'users.yaml'])
     vars['pid'] = cat('pid').strip()
     vars['port'] = cat('port').strip()
 
-- 
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