ch22: sync

22-asyncio/domains/blogdom.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env python3
+import asyncio
+import socket
+from keyword import kwlist
+
+MAX_KEYWORD_LEN = 4  # <1>
+
+
+async def probe(domain: str) -> tuple[str, bool]:  # <2>
+    loop = asyncio.get_running_loop()  # <3>
+    try:
+        await loop.getaddrinfo(domain, None)  # <4>
+    except socket.gaierror:
+        return (domain, False)
+    return (domain, True)
+
+
+async def main() -> None:  # <5>
+    names = (kw for kw in kwlist if len(kw) <= MAX_KEYWORD_LEN)  # <6>
+    domains = (f'{name}.dev'.lower() for name in names)  # <7>
+    coros = [probe(domain) for domain in domains]  # <8>
+    for coro in asyncio.as_completed(coros):  # <9>
+        domain, found = await coro  # <10>
+        mark = '+' if found else ' '
+        print(f'{mark} {domain}')
+
+
+if __name__ == '__main__':
+    asyncio.run(main())  # <11>