[test] Adding platform.json configuration file test (sonic-net#13)

* [test] Adding platform.json configuration file test

Signed-off-by: Sangita Maity <sangitamaity0211@gmail.com>

* Addressed review comments

Signed-off-by: Sangita Maity <sangitamaity0211@gmail.com>

src/sonic-device-data/src/Makefile

@@ -11,4 +11,7 @@ test:
 	for f in $$(find ../../../device -name media_settings.json); do
 	    ./media_checker $$f
 	done
+	for f in $$(find ../../../device -name platform.json); do
+	    ./platformJson_checker $$f
+	done
 	popd

src/sonic-device-data/tests/media_checker

@@ -138,7 +138,7 @@ def main(argv):
 
     # Load target file
     if len(argv) == 0:
-        files = glob.glob('*.json')
+        files = glob.glob('*media_settings.json')
     else:
         files = argv
 

src/sonic-device-data/tests/platformJson_checker

@@ -0,0 +1,101 @@
+#!/usr/bin/env python
+try:
+    import re
+    import sys
+    import glob
+    import json
+except ImportError as e:
+    raise ImportError (str(e) + "- required module not found")
+try:
+  basestring
+except NameError:
+  basestring = str
+
+# Global variable
+PORT_ATTRIBUTES = ["index", "lanes", "alias_at_lanes", "breakout_modes", "default_brkout_mode"]
+ATTR_LEN = len(PORT_ATTRIBUTES)
+PORT_REG = "Ethernet(\d+)"
+PLATFORM_JSON = '*platform.json'
+
+def usage():
+    print "Usage: " + sys.argv[0] + " <platform_json_file>"
+    sys.exit(1)
+
+
+def check_port_attr(port_attr):
+    for each_key in port_attr:
+        if each_key not in PORT_ATTRIBUTES:
+            print "Error: "+ each_key + " is not the correct Port attribute."
+            return False
+        if not port_attr[each_key]:
+            print "Error: "+ each_key + " has no value."
+            return False
+        if not isinstance(port_attr[each_key], basestring):
+            print "Error:value type of  "+ each_key + " must be string."
+            return False
+    return True
+
+def check_file(platform_json_file):
+    try:
+        platform_cap_file = open(platform_json_file,"r")
+        platform_file_data = platform_cap_file.read()
+        port_dict = json.loads(platform_file_data)
+
+        for each_port in port_dict:
+
+            # Validate port at top level
+            port_id = re.search(PORT_REG, each_port)
+            if port_id is  None:
+                print "Error: Unknown Interface " + str(each_port) + " at top level"
+                return False
+
+            total_attr = len(port_dict[each_port].keys())
+            port_attr = port_dict[each_port]
+
+            if total_attr != ATTR_LEN:
+                missing_attr = ', '.join(set(PORT_ATTRIBUTES).difference(list(port_attr)))
+                print "Error: " + missing_attr + " of " + each_port + " is/are missing"
+                return False
+
+            #Validate port attributes for each port
+            if not check_port_attr(port_attr):
+                return False
+
+    except IOError:
+        print "Error: Cannot open file " + platform_json_file
+        return False
+    except ValueError,e:
+        print "Error in parsing json file " + platform_json_file + " "
+        print str(e)
+        return False
+
+    return True
+
+
+def main(argv):
+
+    if len(argv) > 0 and argv[0] == "-h":
+        usage()
+
+    # Load target file
+    if len(argv) == 0:
+        files = glob.glob(PLATFORM_JSON)
+    else:
+        files = argv
+
+    all_good = True
+
+    for f in files:
+        good = check_file(f)
+        if good:
+            print "File " + f + " passed validity check"
+        else:
+            print "File " + f + " failed validity check"
+
+        all_good = all_good and good
+
+    if not all_good:
+        sys.exit(-1)
+
+if __name__ == "__main__":
+    main(sys.argv[1:])