[PATCH v5 4/9] rpcctl: Add a command for printing rpc client information

[schumaker.anna@gmail.com]

From: Anna Schumaker <Anna.Schumaker@Netapp.com>

It's mostly the same information as with xprt-switches, except with
rpc-client id prepended to the first line.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
v5: Clean up how the RpcClient __str__() function works
    Rename the subcommand to simply "client"
---
 tools/rpcctl/client.py | 27 +++++++++++++++++++++++++++
 tools/rpcctl/rpcctl.py |  2 ++
 tools/rpcctl/switch.py |  5 +++--
 3 files changed, 32 insertions(+), 2 deletions(-)
 create mode 100644 tools/rpcctl/client.py

diff --git a/tools/rpcctl/client.py b/tools/rpcctl/client.py
new file mode 100644
index 000000000000..42c9bee0d2d8
--- /dev/null
+++ b/tools/rpcctl/client.py
@@ -0,0 +1,27 @@
+import sysfs
+import switch
+
+class RpcClient:
+    def __init__(self, path):
+        self.path = path
+        self.id = int(path.stem.split("-")[1])
+        self.switch = switch.XprtSwitch(path / (path / "switch").readlink(), sep=",")
+
+    def __lt__(self, rhs):
+        return self.id < rhs.id
+
+    def __str__(self):
+        return f"client {self.id}: {self.switch}"
+
+
+def list_rpc_clients(args):
+    clients = [ RpcClient(f) for f in (sysfs.SUNRPC / "rpc-clients").iterdir() ]
+    clients.sort()
+    for client in clients:
+        if args.id == None or client.id == args.id[0]:
+            print(client)
+
+def add_command(subparser):
+    parser = subparser.add_parser("client", help="Commands for rpc clients")
+    parser.add_argument("--id", metavar="ID", nargs=1, type=int, help="Id of a specific client to show")
+    parser.set_defaults(func=list_rpc_clients)
diff --git a/tools/rpcctl/rpcctl.py b/tools/rpcctl/rpcctl.py
index dfad6ac08fa0..e2172cdfa4c1 100755
--- a/tools/rpcctl/rpcctl.py
+++ b/tools/rpcctl/rpcctl.py
@@ -10,9 +10,11 @@ def show_small_help(args):
 parser.set_defaults(func=show_small_help)
 
 
+import client
 import switch
 import xprt
 subparser = parser.add_subparsers(title="commands")
+client.add_command(subparser)
 switch.add_command(subparser)
 xprt.add_command(subparser)
 
diff --git a/tools/rpcctl/switch.py b/tools/rpcctl/switch.py
index c96e70b7710f..497ee8b1923c 100644
--- a/tools/rpcctl/switch.py
+++ b/tools/rpcctl/switch.py
@@ -2,10 +2,11 @@ import sysfs
 import xprt
 
 class XprtSwitch:
-    def __init__(self, path):
+    def __init__(self, path, sep=":"):
         self.path = path
         self.id = int(path.stem.split("-")[1])
         self.info = sysfs.read_info_file(path / "xprt_switch_info")
+        self.sep = sep
 
         self.xprts = [ xprt.Xprt(p) for p in self.path.iterdir() if p.is_dir() ]
         self.xprts.sort()
@@ -14,7 +15,7 @@ class XprtSwitch:
         return self.path < rhs.path
 
     def __str__(self):
-        switch =  f"switch {self.id}: " \
+        switch =  f"switch {self.id}{self.sep} " \
                   f"xprts {self.info['num_xprts']}, " \
                   f"active {self.info['num_active']}, " \
                   f"queue {self.info['queue_len']}"
-- 
2.33.1