initial nsd helper library and methods for getting zones, writing config, etc

binder/backends/nsd.py

@@ -0,0 +1,71 @@
+# NSD Backend Handler Class
+
+import os
+from django.conf import settings
+from jinja2 import Template
+import re
+import subprocess
+
+NSD_CONF_TEMPLATE = """
+# nsd.conf for {{hostname}}
+remote-control:
+    control-enable: yes
+    control-key-file: {{creds_dir}}/{{hostname}}/nsd_control.key
+    control-cert-file: {{creds_dir}}/{{hostname}}/nsd_control.pem
+    server-cert-file: {{creds_dir}}/{{hostname}}/nsd_server.pem
+
+"""
+
+ZONE_RE = re.compile("""
+zone\:\s+(?P<zone_name>\S+)
+\s+state: master""")
+
+class NSDServer(object):
+    """Class to manage NSD backend server data."""
+
+    def __init__(self, hostname, control_port):
+        self.hostname = hostname
+        self.control_port = control_port
+
+    def get_creds_dir(self):
+        return os.path.join(settings.CREDS_DIR,
+                            self.hostname)
+
+
+    def get_config_path(self):
+        return os.path.join(
+            os.path.join(self.get_creds_dir()),
+            'nsd.conf')
+
+    def write_config(self):
+        if not os.path.exists(self.get_creds_dir()):
+            os.makedirs(self.get_creds_dir())
+
+        with open(self.get_config_path(), 'w') as f:
+            template = Template(NSD_CONF_TEMPLATE)
+            conf = template.render(
+                creds_dir=settings.CREDS_DIR,
+                hostname=self.hostname)
+            f.write(conf)
+
+    def get_zone_list(self):
+        try:
+            zs_out = subprocess.check_output(
+                ["/usr/sbin/nsd-control",
+                "-c", self.get_config_path(),
+                "-s", self.hostname,
+                "zonestatus"],
+                stderr=subprocess.STDOUT,
+            ).decode('utf-8')
+        except subprocess.CalledProcessError:
+            raise
+        zones = ZONE_RE.findall(zs_out, re.MULTILINE)
+        zone_data = {}
+        zone_data['stats'] = {}
+        zone_data['stats']['zone_stats'] = {}
+
+        for zone in zones:
+            zone_data['stats']['zone_stats'][zone] = {}
+            zone_data['stats']['zone_stats'][zone]["no_view"] = {}
+            zone_data['stats']['zone_stats'][zone]["no_view"]["serial"] =  "n/a"
+        return zone_data