[spp] [PATCH 04/13] controller: add load command

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

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

Load command is for loading a command plugin. It enables users to
activate a command after SPP controller is launched. Plugin files
are included in 'src/controller/command/'.

This update also includes a sample command 'hello'. It says hello
message with given name.

  spp > load hello
  spp > hello alice
  Hello, alice!

Signed-off-by: Yasufumi Ogawa <ogawa.yasufumi@lab.ntt.co.jp>
---
 src/controller/command/__init__.py |  0
 src/controller/command/hello.py    | 28 ++++++++++++++++++++++++++++
 src/controller/shell.py            | 21 +++++++++++++++++++++
 3 files changed, 49 insertions(+)
 create mode 100644 src/controller/command/__init__.py
 create mode 100644 src/controller/command/hello.py

diff --git a/src/controller/command/__init__.py b/src/controller/command/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/controller/command/hello.py b/src/controller/command/hello.py
new file mode 100644
index 0000000..f898234
--- /dev/null
+++ b/src/controller/command/hello.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+# coding: utf-8
+
+
+class Hello(object):
+    def __init__(self, name):
+        self.name = name
+
+    def say(self):
+        print("Hello, %s!" % self.name)
+
+
+def do_hello(name):
+    """Say hello to given user
+
+    spp > hello alice
+    Hello, alice!
+    """
+
+    if name == '':
+        print('name is required!')
+    else:
+        hl = Hello(name)
+        hl.say()
+
+if __name__ == "__main__":
+    hello = Hello()
+    print(hello.say())
diff --git a/src/controller/shell.py b/src/controller/shell.py
index 06b0012..7c7d94a 100644
--- a/src/controller/shell.py
+++ b/src/controller/shell.py
@@ -1,4 +1,5 @@
 import cmd
+# import importlib
 import json
 import os
 from Queue import Empty
@@ -563,3 +564,23 @@ class Shell(cmd.Cmd, object):
         self.close()
         print('Thank you for using Soft Patch Panel')
         return True
+
+    def do_load(self, args):
+        """Load command plugin
+
+        Path of plugin file is 'spp/src/controller/command'.
+
+        spp > load hello
+        """
+
+        args = re.sub(',', ' ', args)
+        args = re.sub(r'\s+', ' ', args)
+        list_args = args.split(' ')
+
+        libdir = 'command'
+        loaded = '%s.%s' % (libdir, list_args[0])
+        # importlib.import_module(loaded)
+        exec('import %s' % loaded)
+        do_cmd = '%s.do_%s' % (loaded, list_args[0])
+        setattr(self, 'do_%s' % list_args[0], eval(do_cmd))
+        print("Module '%s' loaded." % loaded)
-- 
2.13.1