support uvicorn reload functionality (#1841)

* support uvicorn reload functionality
see:
https://github.com/encode/uvicorn/blob/8239373ec649b1a41179070b6ba2c8dc549df63e/uvicorn/main.py#L580-L582
* add docs for --reload

---------

Co-authored-by: dni ⚡ <office@dnilabs.com>

Makefile

@@ -36,6 +36,9 @@ checkblack:
 checkisort:
 	poetry run isort --check-only .
 
+dev:
+	poetry run lnbits --reload
+
 test:
 	LNBITS_BACKEND_WALLET_CLASS="FakeWallet" \
 	FAKE_WALLET_SECRET="ToTheMoon1" \

docs/devs/development.md

@@ -12,6 +12,21 @@ For developers
 Thanks for contributing :)
 
 
+Run
+=====
+
+This starts the lnbits uvicorn server
+```bash
+poetry run lnbits
+```
+
+This starts the lnbits uvicorn with hot reloading.
+```bash
+make dev
+# or
+poetry run lnbits --reload
+```
+
 Precommit hooks
 =====
 

lnbits/server.py

@@ -1,4 +1,5 @@
 import uvloop
+from uvicorn.supervisors import ChangeReload
 
 uvloop.install()
 
@@ -73,7 +74,14 @@ def main(
         )
 
         server = uvicorn.Server(config=config)
-        process = mp.Process(target=server.run)
+
+        if config.should_reload:
+            sock = config.bind_socket()
+            run = ChangeReload(config, target=server.run, sockets=[sock]).run
+        else:
+            run = server.run
+
+        process = mp.Process(target=run)
         process.start()
         server_restart.wait()
         server_restart.clear()