Updater for decky-loader (#117)

* Add an updater in settings for decky-loader

* add chmod

* remove junk comments

backend/main.py

@@ -27,6 +27,7 @@ from browser import PluginBrowser
 from injector import inject_to_tab, tab_has_global_var
 from loader import Loader
 from utilities import Utilities
+from updater import Updater
 
 logger = getLogger("Main")
 
@@ -47,6 +48,7 @@ class PluginManager:
         self.plugin_loader = Loader(self.web_app, CONFIG["plugin_path"], self.loop, CONFIG["live_reload"])
         self.plugin_browser = PluginBrowser(CONFIG["plugin_path"], self.web_app)
         self.utilities = Utilities(self)
+        self.updater = Updater(self)
 
         jinja_setup(self.web_app)
         self.web_app.on_startup.append(self.inject_javascript)

backend/updater.py

@@ -0,0 +1,113 @@
+import uuid
+from logging import getLogger
+from json.decoder import JSONDecodeError
+
+from asyncio import sleep
+
+from aiohttp import ClientSession, web
+
+from injector import inject_to_tab, get_tab
+
+from os import getcwd, path
+
+from subprocess import call
+
+import helpers
+
+logger = getLogger("Updater")
+
+class Updater:
+    def __init__(self, context) -> None:
+        self.context = context
+        self.updater_methods = {
+            "get_version": self.get_version,
+            "do_update": self.do_update,
+            "do_restart": self.do_restart
+        }
+        self.remoteVer = None
+        try:
+            with open(path.join(getcwd(), ".loader.version"), 'r') as version_file:
+                self.localVer = version_file.readline().replace("\n", "")
+        except:
+            self.localVer = False
+
+        if context:
+            context.web_app.add_routes([
+                web.post("/updater/{method_name}", self._handle_server_method_call)
+            ])
+            context.loop.create_task(self.version_reloader())
+
+    async def _handle_server_method_call(self, request):
+        method_name = request.match_info["method_name"]
+        try:
+            args = await request.json()
+        except JSONDecodeError:
+            args = {}
+        res = {}
+        try:
+            r = await self.updater_methods[method_name](**args)
+            res["result"] = r
+            res["success"] = True
+        except Exception as e:
+            res["result"] = str(e)
+            res["success"] = False
+        return web.json_response(res)
+
+    async def get_version(self):
+        if self.localVer:
+            return {
+                "current": self.localVer,
+                "remote": self.remoteVer,
+                "updatable": self.remoteVer != None
+            }
+        else:
+            return {"current": "unknown", "updatable": False}
+
+    async def version_reloader(self):
+        while True:
+            try:
+                async with ClientSession() as web:
+                    async with web.request("GET", "https://api.github.com/repos/SteamDeckHomebrew/decky-loader/releases", ssl=helpers.get_ssl_context()) as res:
+                        remoteVersions = await res.json()
+                        self.remoteVer = next(filter(lambda ver: ver["prerelease"] and ver["tag_name"].startswith("v") and ver["tag_name"].endswith("-pre"), remoteVersions), None)
+                        logger.info("Updated remote version information")
+            except:
+                pass
+            await sleep(60 * 60) # 1 hour
+
+    async def do_update(self):
+        version = self.remoteVer["tag_name"]
+        #TODO don't hardcode this
+        download_url = self.remoteVer["assets"][0]["browser_download_url"]
+
+        tab = await get_tab("SP")
+        await tab.open_websocket()
+        async with ClientSession() as web:
+            async with web.request("GET", download_url, ssl=helpers.get_ssl_context(), allow_redirects=True) as res:
+                total = int(res.headers.get('content-length', 0))
+
+                with open(path.join(getcwd(), "PluginLoader"), "wb") as out:
+                    progress = 0
+                    raw = 0
+                    async for c in res.content.iter_chunked(512):
+                        out.write(c)
+                        raw += len(c)
+                        new_progress = round((raw / total) * 100)
+                        if progress != new_progress:
+                            if new_progress - progress>= 2:
+                                self.context.loop.create_task(tab.evaluate_js(f"window.DeckyUpdater.updateProgress({progress})", False, False))
+                            progress = new_progress
+
+                with open(path.join(getcwd(), ".loader.version"), "w") as out:
+                    out.write(version)
+
+                call(['chmod', '+x', path.join(getcwd(), "PluginLoader")])
+
+                logger.info("Updated loader installation.")
+                await tab.evaluate_js("window.DeckyUpdater.finish()", False, False)
+                await tab.client.close()
+
+    async def do_restart(self):
+        call(["systemctl", "daemon-reload"])
+        call(["systemctl", "restart", "plugin_loader"])
+        exit(0)