Add Activity 4

bookapp.py

@@ -4,20 +4,71 @@
 
 DB = BookDB()
 
+def resolve_path(path):
+    funcs = {
+        '': books,
+        'book': book,
+    }
+
+    path = path.strip('/').split('/')
+
+    func_name = path[0]
+    args = path[1:]
+
+    try:
+        func = funcs[func_name]
+    except KeyError:
+        raise NameError
+
+    return func, args
+
 
 def book(book_id):
-    return "<h1>a book with id %s</h1>" % book_id
+    entry = DB.title_info(book_id)
+    if not entry:
+        raise NameError
+    page = """
+<h1>{title}</h1>
+<table>
+    <tr><th>Author</th><td>{author}</td></tr>
+    <tr><th>Publisher</th><td>{publisher}</td></tr>
+    <tr><th>ISBN</th><td>{isbn}</td></tr>
+</table>
+<a href="/">Back to the list</a>
+"""
+
+    return page.format(**entry)
 
 
 def books():
-    return "<h1>a list of books</h1>"
+    book_list = DB.titles()
+    body = ["<h1>Book Index</h1>"]
+    item_template = '<li><a href="/book/{id}">{title}</a></li>'
+    for book in book_list:
+        body.append(item_template.format(**book))
+    return '\n'.join(body)
 
 
 def application(environ, start_response):
-    status = "200 OK"
+    # status = "200 OK"
     headers = [('Content-type', 'text/html')]
-    start_response(status, headers)
-    return ["<h1>No Progress Yet</h1>".encode('utf8')]
+    try:
+        path=environ.get('PATH_INFO',None)
+        if not path:
+            raise NameError
+        func, args = resolve_path(path)
+        body = func(*args)
+        status = "200 OK"
+    except NameError:
+        status = "404 Not Found"
+        body = "<h1>Not Found</h1>"
+    except:
+        status = "500 Internal Server Error"
+        body = "<h1>Vague Server Error</h1"
+    finally:
+        headers.append(("Content-Length", str(len(body))))
+        start_response(status, headers)
+        return [body.encode('utf8')]
 
 
 if __name__ == '__main__':

wsgi_1.py

@@ -21,11 +21,11 @@ def application(environ, start_response):
 
     response_body = body.format(
         software=environ.get('SERVER_SOFTWARE', default),
-        path="aaaa",
-        month="bbbb",
-        date="cccc",
-        year="dddd",
-        client_ip="eeee"
+        path=environ.get('PATH_INFO', default),
+        month=datetime.datetime.now().strftime('%B'),
+        date=datetime.datetime.now().day,
+        year=datetime.datetime.now().year,
+        client_ip=environ.get('REMOTE_ADDR', default)
     )
     status = '200 OK'