syncdaemon: config revamp #3: implement command line get/set/del interface to configuration

The INI style config file has following type of sections:

- [global]
- [peers <local>]
- [peers <local> <remote>]

Option dispatch to sections is derived from command line (ie., [global]
if no arg given, [peers <local>] with <local> being the only arg,
[peers <local> <remote>] if <local> and <remote> args are provided).
So this all happens under the hood, gsyncd users need not to specify
sections.

New command line options:

- query options:
  --config-get-all
  --config-get OPT
- modify options:
  --config-set OPT VAL
  --config-del OPT

Signed-off-by: Csaba Henk <csaba@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 1570 (geosync related changes)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1570

1 files changed, 50 insertions, 0 deletions

diff --git a/configinterface.py b/configinterface.py
new file mode 100644
index 00000000000..7bc1d4731a7
--- /dev/null
+++ b/configinterface.py
@@ -0,0 +1,50 @@
+import ConfigParser
+
+DEF_SECT = 'global'
+
+class GConffile(object):
+
+    def __init__(self, path, peers):
+        if peers:
+            self.section = 'peers ' + ' '.join(peers)
+        else:
+            self.section = DEF_SECT
+        self.path = path
+        self.config = ConfigParser.RawConfigParser({}, dict)
+        self.config.read(path)
+
+    def update_to(self, dct):
+        for sect in set([DEF_SECT, self.section]):
+            if self.config.has_section(sect):
+                dct.update(self.config._sections[sect])
+
+    def get(self, opt=None):
+        d = {}
+        self.update_to(d)
+        if opt:
+            d = {opt: d.get(opt, "")}
+        for k, v in d.iteritems():
+            if k == '__name__':
+                continue
+            print("%s: %s" % (k, v))
+
+    def write(self):
+        f = None
+        try:
+            f = open(self.path, 'wb')
+            self.config.write(f)
+        finally:
+            if f:
+                f.close()
+
+    def set(self, opt, val):
+        if not self.config.has_section(self.section):
+            self.config.add_section(self.section)
+        self.config.set(self.section, opt, val)
+        self.write()
+
+    def delete(self, opt):
+        if not self.config.has_section(self.section):
+            return
+        if self.config.remove_option(self.section, opt):
+            self.write()