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Sender: Anna Schumaker <schumakeranna@gmail.com>
From:   schumaker.anna@gmail.com
To:     steved@redhat.com, linux-nfs@vger.kernel.org
Cc:     Anna.Schumaker@Netapp.com
Subject: [PATCH v2 5/9] nfs-sysfs.py: Add a command for changing xprt dstaddr
Date:   Fri,  6 Aug 2021 16:17:35 -0400
Message-Id: <20210806201739.472806-6-Anna.Schumaker@Netapp.com>
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From: Anna Schumaker <Anna.Schumaker@Netapp.com>

Using the socket module for dns resolution

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
 tools/nfs-sysfs/xprt.py | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/tools/nfs-sysfs/xprt.py b/tools/nfs-sysfs/xprt.py
index fbdd9bfc9375..2160cb0a9575 100644
--- a/tools/nfs-sysfs/xprt.py
+++ b/tools/nfs-sysfs/xprt.py
@@ -1,3 +1,4 @@
+import socket
 import sysfs
 
 class Xprt:
@@ -34,6 +35,12 @@ class Xprt:
         return "xprt %s: %s, %s%s" % (self.id, self.type, self.dstaddr,
                                      f" [main]" if self.main_xprt else "" )
 
+    def set_dstaddr(self, newaddr):
+        resolved = socket.gethostbyname(newaddr)
+        with open(self.path / "dstaddr", 'w') as f:
+            f.write(resolved)
+        self.dstaddr = open(self.path / "dstaddr", 'r').readline().strip()
+
 
 def list_xprts(args):
     xprts = [ Xprt(f) for f in (sysfs.SUNRPC / "xprt-switches").glob("**/xprt-*") ]
@@ -42,7 +49,28 @@ def list_xprts(args):
         if args.id == None or xprt.id == args.id[0]:
             print(xprt)
 
+def get_xprt(id):
+    xprts = [ Xprt(f) for f in (sysfs.SUNRPC / "xprt-switches").glob("**/xprt-*") ]
+    for xprt in xprts:
+        if xprt.id == id:
+            return xprt
+
+def set_xprt_property(args):
+    xprt = get_xprt(args.id[0])
+    try:
+        if args.dstaddr != None:
+            xprt.set_dstaddr(args.dstaddr[0])
+        print(xprt)
+    except Exception as e:
+        print(e)
+
 def add_command(subparser):
     parser = subparser.add_parser("xprt", help="Commands for individual xprts")
     parser.add_argument("--id", metavar="ID", nargs=1, type=int, help="Id of a specific xprt to show")
     parser.set_defaults(func=list_xprts)
+
+    subparser = parser.add_subparsers()
+    parser = subparser.add_parser("set", help="Set an xprt property")
+    parser.add_argument("--id", metavar="ID", nargs=1, type=int, required=True, help="Id of a specific xprt to modify")
+    parser.add_argument("--dstaddr", metavar="dstaddr", nargs=1, type=str, help="New dstaddr to set")
+    parser.set_defaults(func=set_xprt_property)
-- 
2.32.0