adding database functionality

\

@@ -0,0 +1,104 @@
+#!/usr/bin/env python3
+"""
+Handle API requests to the database
+"""
+import json
+import sqlite3
+
+
+# DATABASE = '/usr/local/www/mocha-server/mocha.db'
+DATABASE = 'mocha.db'
+
+conn = sqlite3.connect(DATABASE)
+conn.row_factory = sqlite3.Row
+cursor = conn.cursor()
+
+
+
+# TODO: Add fetching of list of users
+# TODO: Add fetching of top N users by score
+# TODO: Add ability to store and retrieve avatars (as image files?)
+
+def get_top_N(search_parameter, N):
+    """
+
+    """
+    cursor.execute("select * from users order by p0 desc limit p1", {'p0':search_parameter, 'p1':N})
+    conn.commit()
+    conn.close()
+
+
+# add new parameters as needed
+def update_row(user_id, updated_username):
+    print()
+
+def insert_row(user_id, username):
+    """
+	Inserts a row for a NEW user with given parameters
+	This may work better with AUTOINCREMENT to avoid arbitrary ids and duplicates
+	"""
+
+    cursor.execute("insert into users values (?,?)", (user_id, username))
+    conn.commit()
+    conn.close()
+
+
+def fetch_user(user_id):
+    """
+    Returns a JSON object containing the requested user
+    Also can return a list of all users if user_id == "*"
+    """
+
+    if user_id != '*': # must use (?), (item,) format
+        cursor.execute("SELECT * FROM users WHERE user_id=(?)", (user_id,))
+    else:
+        cursor.execute("SELECT * FROM users")
+
+    output = cursor.fetchall()
+    output = json.dumps([dict(row) for row in output])
+    conn.close()
+
+    if output == '[]':
+        output = None
+
+    return output
+
+
+def process_request(uri):
+    """
+    Handles the API endpoint.
+    Currently supports:
+        -   /mocha/users/"user_id"      Returns JSON of the specified user
+        -   /mocha/users/*              Returns JSON list of all users
+    """
+    parts = uri.split('/')[1:]
+    assert parts[0] == 'mocha'
+
+    output = None
+
+    if parts[1] == 'users':
+        output = fetch_user(parts[2])
+
+    return output
+
+
+
+def application(environ, start_response):
+    """
+    mod_wsgi entry point
+    """
+    status = '200 OK'
+    output = process_request(environ['REQUEST_URI'])
+
+    if output is None:
+        status = '404 Not Found'
+        output = ''
+
+    output = output.encode('UTF-8')
+
+    response_headers = [('Content-type', 'application/json'),
+                        ('Content-Length', str(len(output)))]
+
+    start_response(status, response_headers)
+
+    return [output]

mocha_server.py

@@ -19,6 +19,15 @@ cursor = conn.cursor()
 # TODO: Add fetching of top N users by score
 # TODO: Add ability to store and retrieve avatars (as image files?)
 
+def get_top_N(search_parameter, N):
+    """
+    in progress
+    """
+    cursor.execute("select * from users order by p0 desc limit p1", {'p0':search_parameter, 'p1':N})
+    conn.commit()
+    conn.close()
+
+
 # add new parameters as needed
 def update_row(user_id, updated_username):
     print()
@@ -29,8 +38,7 @@ def insert_row(user_id, username):
 	This may work better with AUTOINCREMENT to avoid arbitrary ids and duplicates
 	"""
 
-    item = (user_id, username)
-    cursor.execute('insert into users values (?,?)', item)
+    cursor.execute("insert into users values (?,?)", (user_id, username))
     conn.commit()
     conn.close()
 

test.py

@@ -3,3 +3,6 @@ import mocha_server
 #mocha_server.insert_row(4, 'andrew')
 
 print(mocha_server.fetch_user(3))
+
+print(mocha_server.get_top_N('username', 2))
+