add sendjson example

Author: marianoguerra

examples/example.json

@@ -0,0 +1 @@
+{"name": "bob", "count": 10}

examples/sendjson.py

@@ -2,22 +2,74 @@
 file as an event"""
 from __future__ import print_function
 
+import os
 import sys
 import json
+import argparse
+
+SAMPLE_DIR = os.path.dirname(__file__)
+BASE_DIR = os.path.join(SAMPLE_DIR, '..', 'src')
+sys.path.append(BASE_DIR)
 
 import eventfabric as ef
+import requests
+
+def parse_args():
+    """parse and return command line arguments"""
+    parser = argparse.ArgumentParser(description='Process some integers.')
+
+    parser.add_argument('--username', '-u', metavar='USERNAME',
+            required=True,
+            help='Username to authenticate to Event Fabric')
+    parser.add_argument('--password', '-p', metavar='PASSWORD',
+            required=True,
+            help='Password to authenticate to Event Fabric')
+    parser.add_argument('--channel', '-c', metavar='CHANNEL',
+            required=True,
+            help='Channel used in the generated event')
+    parser.add_argument('--path', '-P', metavar='PATH',
+            required=True,
+            help='Path to the JSON file you want to send')
+    parser.add_argument('--url', '-U', metavar='URL',
+            help='URL for Event Fabric API',
+            default="https://event-fabric.com/ef/api/")
+
+    return parser.parse_args()
 
 def main():
-    username, password, channel, path = sys.argv[1:]
+    """main program entry point"""
+    args = parse_args()
+
+    print("Config:", args.username, args.channel, args.path, args.url)
+
+    client = ef.Client(args.username, args.password, args.url)
+
+    try:
+        login_ok, login_response = client.login()
+        print("Login:", login_ok)
+
+        if not login_ok:
+            print("Error authenticating", login_response)
+            return
+
+        value = None
+        try:
+            value = json.load(open(args.path))
+        except IOError as error:
+            print("Error opening file", args.path, str(error))
+            return
 
-    print("Config:", username, channel, path, api_root)
+        event = ef.Event(value, args.channel)
+        send_ok, send_response = client.send_event(event)
+        print("Send Event:", send_ok)
 
-    c = ef.Client(username, password, "http://localhost:8080/ef/api/")
+        if not send_ok:
+            print("Error sending event", send_response)
+            return
 
-    print("Login:", c.login())
-    value = json.load(open(path))
-    event = ef.Event(value, channel, username)
-    print("Send Event:", c.send_event(event))
+    except requests.exceptions.ConnectionError as conn_error:
+        print("Error connection to server", args.url, str(conn_error))
+        return
 
 if __name__ == "__main__":
     main()