-
Notifications
You must be signed in to change notification settings - Fork 0
/
32. Horizontal Scaling.py
57 lines (44 loc) · 2.66 KB
/
32. Horizontal Scaling.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
# It's difficult to provide a one-size-fits-all Python code for horizontal scaling, as it depends heavily on the specific application and architecture of the system. However, I can provide a general example of how a load balancer might be implemented using Python:
import http.server
import socketserver
# Set up a simple HTTP server
PORT = 8000
Handler = http.server.SimpleHTTPRequestHandler
httpd = socketserver.TCPServer(("", PORT), Handler)
# Define a list of backend servers to load balance to
backend_servers = ['backend1.example.com', 'backend2.example.com', 'backend3.example.com']
# Set up a load balancer to distribute requests across backend servers
class LoadBalancer:
def __init__(self, servers):
self.servers = servers
self.current = 0
def next_server(self):
server = self.servers[self.current]
self.current = (self.current + 1) % len(self.servers)
return server
load_balancer = LoadBalancer(backend_servers)
# Override the HTTP handler's do_GET method to forward requests to backend servers
class LoadBalancingHandler(http.server.SimpleHTTPRequestHandler):
def do_GET(self):
# Get the next available backend server from the load balancer
backend_server = load_balancer.next_server()
# Forward the request to the backend server
self.proxy_request(backend_server)
def proxy_request(self, backend_server):
# Set up a new HTTP connection to the backend server
conn = http.client.HTTPConnection(backend_server)
# Forward the original request to the backend server
conn.request(self.command, self.path, self.headers)
response = conn.getresponse()
# Forward the backend server's response back to the client
self.send_response(response.status)
for header, value in response.getheaders():
self.send_header(header, value)
self.end_headers()
self.copyfile(response, self.wfile)
conn.close()
# Start the HTTP server with the load balancing handler
httpd.RequestHandlerClass = LoadBalancingHandler
print(f"Serving on port {PORT}")
httpd.serve_forever()
# In this example, we start a simple HTTP server and define a list of backend servers to load balance to. We then define a load balancer that distributes requests across the backend servers in a round-robin fashion. Finally, we override the do_GET method of the HTTP handler to forward requests to the load balancer, which in turn forwards the requests to the appropriate backend server. Note that this is a simplified example and does not take into account many of the complexities involved in implementing a load balancer in a real-world system.