[spp] [PATCH 2/5] controller: exit controller if spp-ctl not running

[ogawa.yasufumi@lab.ntt.co.jp]

From: Yasufumi Ogawa <ogawa.yasufumi@lab.ntt.co.jp>

SPP controller expects spp-ctl is running, so it should notice a user
while launching if it cannot access to spp-ctl. SPP controller already
does notify, but not while launching.

This update is to add 'is_server_running()' to SppCtlClient class to
check if spp-ctl is running. It also fixes incorrect notify of SppTopo
if it cannot access to spp-ctl.

Signed-off-by: Yasufumi Ogawa <ogawa.yasufumi@lab.ntt.co.jp>
---
 src/controller/commands/topo.py  | 19 +++++++++----------
 src/controller/shell.py          |  6 ++----
 src/controller/spp.py            | 13 ++++++++++---
 src/controller/spp_ctl_client.py |  6 ++++++
 4 files changed, 27 insertions(+), 17 deletions(-)

diff --git a/src/controller/commands/topo.py b/src/controller/commands/topo.py
index 53cc8b5..e8afa4a 100644
--- a/src/controller/commands/topo.py
+++ b/src/controller/commands/topo.py
@@ -22,32 +22,31 @@ class SppTopo(object):
 
     delim_node = '_'
 
-    def __init__(self, spp_ctl_cli, sec_ids, subgraphs, size):
+    def __init__(self, spp_ctl_cli, subgraphs, size):
         self.spp_ctl_cli = spp_ctl_cli
-        self.sec_ids = sec_ids
         self.subgraphs = subgraphs
         self.graph_size = size
 
-    def run(self, args):
+    def run(self, args, sec_ids):
         args_ary = args.split()
         if len(args_ary) == 0:
             print("Usage: topo dst [ftype]")
             return False
         elif (args_ary[0] == "term") or (args_ary[0] == "http"):
-            self.show(args_ary[0], self.graph_size)
+            self.show(args_ary[0], sec_ids, self.graph_size)
         elif len(args_ary) == 1:
             ftype = args_ary[0].split(".")[-1]
-            self.output(args_ary[0], ftype)
+            self.output(args_ary[0], sec_ids, ftype)
         elif len(args_ary) == 2:
-            self.output(args_ary[0], args_ary[1])
+            self.output(args_ary[0], sec_ids, args_ary[1])
         else:
             print("Usage: topo dst [ftype]")
 
-    def show(self, dtype, size):
+    def show(self, dtype, sec_ids, size):
         res_ary = []
         error_codes = self.spp_ctl_cli.rest_common_error_codes
 
-        for sec_id in self.sec_ids:
+        for sec_id in sec_ids:
             res = self.spp_ctl_cli.get('nfvs/%d' % sec_id)
             if res.status_code == 200:
                 res_ary.append(res.json())
@@ -65,11 +64,11 @@ class SppTopo(object):
         else:
             print("Invalid file type")
 
-    def output(self, fname, ftype="dot"):
+    def output(self, fname, sec_ids, ftype="dot"):
         res_ary = []
         error_codes = self.spp_ctl_cli.rest_common_error_codes
 
-        for sec_id in self.sec_ids:
+        for sec_id in sec_ids:
             res = self.spp_ctl_cli.get('nfvs/%d' % sec_id)
             if res.status_code == 200:
                 res_ary.append(res.json())
diff --git a/src/controller/shell.py b/src/controller/shell.py
index 28ae86e..2c170e9 100644
--- a/src/controller/shell.py
+++ b/src/controller/shell.py
@@ -44,9 +44,7 @@ class Shell(cmd.Cmd, object):
         self.spp_ctl_cli = spp_ctl_cli
         self.spp_primary = pri.SppPrimary(self.spp_ctl_cli)
         self.spp_secondary = sec.SppSecondary(self.spp_ctl_cli)
-        self.spp_topo = topo.SppTopo(self.spp_ctl_cli,
-                                     self.get_sec_ids('nfv'),
-                                     {}, self.topo_size)
+        self.spp_topo = topo.SppTopo(self.spp_ctl_cli, {}, self.topo_size)
         self.spp_bye = bye.SppBye(self.spp_ctl_cli, self.spp_primary,
                                   self.spp_secondary)
 
@@ -660,7 +658,7 @@ class Shell(cmd.Cmd, object):
         spp > topo network_conf.js# text
         """
 
-        self.spp_topo.run(args)
+        self.spp_topo.run(args, self.get_sec_ids('nfv'))
 
     def complete_topo(self, text, line, begidx, endidx):
 
diff --git a/src/controller/spp.py b/src/controller/spp.py
index 6b0d99c..99cdda3 100644
--- a/src/controller/spp.py
+++ b/src/controller/spp.py
@@ -19,9 +19,16 @@ def main(argv):
                         help='bind address, default=7777')
     args = parser.parse_args()
 
-    shell = Shell(spp_ctl_client.SppCtlClient(args.bind_addr, args.api_port))
-    shell.cmdloop()
-    shell = None
+    try:
+        spp_ctl_cli = spp_ctl_client.SppCtlClient(args.bind_addr, args.api_port)
+        if spp_ctl_cli.is_server_running() == False:
+            print('Is not spp-ctl running, nor correct IP address?')
+            exit()
+        shell = Shell(spp_ctl_cli)
+        shell.cmdloop()
+        shell = None
+    except Exception as e:
+        print(e)
 
 
 if __name__ == "__main__":
diff --git a/src/controller/spp_ctl_client.py b/src/controller/spp_ctl_client.py
index 8a88fa4..0f8687a 100644
--- a/src/controller/spp_ctl_client.py
+++ b/src/controller/spp_ctl_client.py
@@ -56,3 +56,9 @@ class SppCtlClient(object):
     def delete(self, req):
         url = '%s/%s' % (self.base_url, req)
         return requests.delete(url)
+
+    def is_server_running(self):
+        if self.get('processes') is None:
+            return False
+        else:
+            return True
-- 
2.13.1