[spp] [PATCH] controller: avoid launch with duplicated IDs

[yasufum.o@gmail.com]

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

If secondary processes are launched with the same ID, it should be
uncontrollable. To avoid such a situation, this patch adds checking
secondary ID for `pri; launch` command.

Signed-off-by: Yasufumi Ogawa <yasufum.o@gmail.com>
---
 src/controller/commands/pri.py | 23 ++++++++++++++++++++---
 src/controller/spp_common.py   |  6 +++++-
 2 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/src/controller/commands/pri.py b/src/controller/commands/pri.py
index eaf3d09..5ad0539 100644
--- a/src/controller/commands/pri.py
+++ b/src/controller/commands/pri.py
@@ -347,18 +347,27 @@ class SppPrimary(object):
 
             elif len(tokens) == 4 and tokens[1] == 'launch':
                 if 'max_secondary' in cli_config.keys():
-                    max_secondary = int(cli_config['max_secondary']['val'])
+                    max_secondary = int(
+                            cli_config['max_secondary']['val'])
 
                     if tokens[2] in spp_common.SEC_TYPES:
+                        used_ids = spp_common.used_sec_ids
                         candidates = [
-                                str(i+1) for i in range(max_secondary)]
+                                str(i+1) for i in range(max_secondary)
+                                if str(i+1) not in used_ids]
                 else:
                     logger.error(
                             'Error: max_secondary is not defined in config')
                     candidates = []
 
             elif len(tokens) == 5 and tokens[1] == 'launch':
-                candidates = self._setup_launch_opts(tokens, cli_config)
+                # Do not show candidate if given sec ID is already used.
+                # Sec ID is contained as the third entry in tokens. Here is an
+                # example of tokens.
+                #   ['pri;', 'launch', 'nfv', '1', '']
+                if tokens[3] not in spp_common.used_sec_ids:
+                    candidates = self._setup_launch_opts(
+                            tokens, cli_config)
 
         if not text:
             completions = candidates
@@ -517,6 +526,12 @@ class SppPrimary(object):
             else:
                 opts['app']['--client-id'] = sec_id
 
+        # Check if sec ID is already used.
+        if sec_id in spp_common.used_sec_ids:
+            print('Secondary ID {sid} is already used!'.format(
+                sid=sec_id))
+            return None
+
         logger.debug('launch, {}'.format(opts))
 
         # Send request for launch secondary.
@@ -529,6 +544,8 @@ class SppPrimary(object):
 
                 print('Send request to launch {ptype}:{sid}.'.format(
                     ptype=proc_type, sid=sec_id))
+                # Add used ID to avoid to launch with duplicated ID.
+                spp_common.used_sec_ids.append(sec_id)
             elif res.status_code in error_codes:
                 pass
             else:
diff --git a/src/controller/spp_common.py b/src/controller/spp_common.py
index 6bf8b1f..5ddca46 100644
--- a/src/controller/spp_common.py
+++ b/src/controller/spp_common.py
@@ -5,14 +5,18 @@
 import logging
 import os
 
+# Type definitions.
 PORT_TYPES = ['phy', 'ring', 'vhost', 'pcap', 'nullpmd']
-
 SEC_TYPES = ['nfv', 'vf', 'mirror', 'pcap']
 
 LOGFILE = 'spp_cli.log'  # name of logfile under `/src/controller/log/`
 
+# Current server under management of SPP CLI.
 cur_server_addr = None
 
+# Entry of used secondary IDs to avoid to launch duplicated ID.
+used_sec_ids = []
+
 # Setup logger object
 logger = logging.getLogger(__name__)
 # handler = logging.StreamHandler()
-- 
2.17.1