feat(blog): add p2p web hosting entry

Author: adminy

source/_posts/p2p-web-hosting.md

@@ -0,0 +1,96 @@
+---
+title: P2P Web Hosting
+date: 25/04/2025
+---
+
+# basic local example
+
+### Client A
+#### Host a http web server via unix sockets.
+> server.py
+```python
+import http.server
+import json
+import os
+import socket
+import sys
+import traceback
+
+def process_cmd(cmd, *args):
+    print(f"In process_cmd({cmd}, {args})...")
+
+class HTTPHandler(http.server.BaseHTTPRequestHandler):
+    def do_POST(self):
+        size = int(self.headers.get('Content-Length', 0))
+        body = self.rfile.read(size)
+        args = json.loads(body) if body else []
+        try:
+            result = process_cmd(self.path[1:], *args)
+            self.send(200, result or 'Success')
+        except Exception:
+            self.send(500, str(traceback.format_exc()))
+
+    def do_GET(self):
+        self.do_POST()
+
+    def send(self, code, reply):
+        # avoid exception in server.py address_string()
+        self.client_address = ('',)
+        self.send_response(code)
+        self.end_headers()
+        self.wfile.write(reply.encode('utf-8'))
+
+sock_file = sys.argv[1]
+try:
+    os.remove(sock_file)
+except OSError:
+    pass
+sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+sock.bind(sock_file)
+sock.listen(0)
+
+server = http.server.HTTPServer(sock_file, HTTPHandler,
+                                False)
+server.socket = sock
+server.serve_forever()
+
+sock.shutdown(socket.SHUT_RDWR)
+sock.close()
+os.remove(sock_file)
+```
+and run this with:
+
+`python3 server.py /tmp/http.socket`
+
+## Client B
+### Turn the web socket path into a tcp connection that the browser can understand
+```bash
+socat TCP-LISTEN:80,forever,reuseaddr,fork UNIX-CONNECT:/tmp/http.socket
+```
+
+### Use browser to see web page:
+> `http://localhost`
+
+
+# same example using P2P
+
+### Client A
+```bash
+python3 server.py /tmp/http.socket
+# From another terminal, pipe the server socket into dumbpipe
+socat UNIX-CONNECT:/tmp/http.socket,keepalive,ignoreeof EXEC:"dumbpipe listen",reuseaddr
+# Note down nodeId from the console.
+```
+
+### Client B
+```bash
+export nodeId=">>The id from client A Console.<<"
+# Connect to dumbpipe and expose the socket via tcp.
+export CMD="dumbpipe connect $nodeId"
+socat EXEC:"$CMD" TCP-LISTEN:80,forever,reuseaddr,fork
+# Test from another terminal
+curl http://localhost
+```
+
+> *So far this only accepts 1 http e2e and you have to kill `socat` on client B for `curl` to respond. This is due to unix-listen just stuck with the first request and it won't fork additional requests.*
+