[spp] [PATCH] cli: add validation for config command

[yasufum.o@gmail.com]

From: Yasufumi Ogawa <yasufum.o@gmail.com>

SPP CLI accepts any of config parameters, so user can set invalid value
for config and unexpected error might be happened.

This update is to add method validate_config_val() to check if the
given config value is valid or not.

Signed-off-by: Yasufumi Ogawa <yasufum.o@gmail.com>
---
 src/cli/shell.py            | 15 +++++---
 src/cli/shell_lib/common.py | 70 +++++++++++++++++++++++++++++++++++++
 2 files changed, 80 insertions(+), 5 deletions(-)

diff --git a/src/cli/shell.py b/src/cli/shell.py
index 989f071..c822fc9 100644
--- a/src/cli/shell.py
+++ b/src/cli/shell.py
@@ -36,7 +36,7 @@ class Shell(cmd.Cmd, object):
                         os.path.dirname(__file__))
 
             self.cli_config = yaml.load(open(config_path),
-                Loader=yaml.FullLoader)
+                                        Loader=yaml.FullLoader)
         except IOError as e:
             print('Error: No config file found!')
             print(e)
@@ -50,7 +50,8 @@ class Shell(cmd.Cmd, object):
 
         # Shell settings which are reserved vars of Cmd class.
         # `intro` is to be shown as a welcome message.
-        self.intro = 'Welcome to the SPP CLI. Type `help` or `?` to list commands.\n'
+        self.intro = 'Welcome to the SPP CLI. ' + \
+                     'Type `help` or `?` to list commands.\n'
         self.prompt = self.cli_config['prompt']['val']  # command prompt
 
         # Recipe file to be recorded with `record` command
@@ -611,9 +612,13 @@ class Shell(cmd.Cmd, object):
                 for s in ['"', "'"]:
                     args = args.replace(s, '')
 
-                # TODO(yasufum) add validation for given value
-                self.cli_config[key]['val'] = args[(len(key) + 1):]
-                print('Set {}: "{}"'.format(key, self.cli_config[key]['val']))
+                val = args[(len(key) + 1):]
+                if common.validate_config_val(key, val):
+                    self.cli_config[key]['val'] = val
+                    print('Set {k}: "{v}"'.format(k=key, v=val))
+                else:
+                    print('Invalid value "{v}" for "{k}"'.format(
+                        k=key, v=val))
 
                 # Command prompt should be updated immediately
                 if key == 'prompt':
diff --git a/src/cli/shell_lib/common.py b/src/cli/shell_lib/common.py
index 4941bba..ad34e56 100644
--- a/src/cli/shell_lib/common.py
+++ b/src/cli/shell_lib/common.py
@@ -3,6 +3,7 @@
 # Copyright(c) 2017-2018 Nippon Telegraph and Telephone Corporation
 
 import os
+import re
 from .. import spp_common
 
 CHAR_EXCEPT = '-'
@@ -207,8 +208,77 @@ def is_valid_port(port_num):
 
     return True
 
+
 def current_server_addr():
     return spp_common.cur_server_addr
 
+
 def set_current_server_addr(ipaddr, port):
     spp_common.cur_server_addr = '{}:{}'.format(ipaddr, port)
+
+
+def validate_config_val(key, val):
+    """Check if given value is valid for config."""
+
+    # Check int value
+    should_be_int_vals = [
+            'max_secondary', 'sec_m_lcore', 'sec_nfv_nof_lcores',
+            'sec_vf_nof_lcores', 'sec_mirror_nof_lcores',
+            'sec_pcap_nof_lcores']
+    if key in should_be_int_vals:
+        if re.match(r'\d+$', val) is not None:
+            return True
+        else:
+            return False
+
+    # topo_size should be percentage or ratio.
+    if key == 'topo_size':
+        matched = re.match(r'(\d+)%$', val)
+        if matched is not None:
+            percentage = int(matched.group(1))
+            if percentage > 0 and percentage <= 100:
+                return True
+            else:
+                return False
+
+        matched = re.match(r'([0-1]\.\d+)$', val)
+        if (matched is not None) or (val == '1'):
+            if val == '1':
+                ratio = 1.0
+            else:
+                ratio = float(matched.group(1))
+            if ratio > 0 and ratio <= 1:
+                return True
+            else:
+                return False
+        else:
+            return False
+
+    # Check pcap port.
+    # TODO(yasufum) confirm cap_ports is correct
+    cap_ports = ['phy', 'ring']
+    if key == 'sec_pcap_port':
+        matched = re.match(r'(\w+):(\d+)$', val)
+        if matched is not None:
+            if matched.group(1) in cap_ports:
+                return True
+            return False
+        else:
+            return False
+
+    # Check memory option
+    if key == 'sec_mem':
+        # Match '-m 512' or so.
+        matched = re.match(r'-m\s+\d+$', val)
+        if matched is not None:
+            return True
+
+        # Match '--socket-mem 512', '--socket-mem 512,512' or so.
+        matched = re.match(r'--socket-mem\s+([1-9,]+\d+)$', val)
+        if matched is not None:
+            return True
+        else:
+            return False
+
+    # No need to check others.
+    return True
-- 
2.17.1