deamon

.gitignore

@@ -2,3 +2,4 @@ packages
 venv
 .idea
 __pycache__
+errlog.txt

daemon/SimpleDaemon.py

@@ -0,0 +1,207 @@
+"""Generic linux daemon base class for python 3.x."""
+
+import sys, os, time, atexit, signal, logging
+
+
+class Daemon:
+    """A generic daemon class.
+
+    Usage: subclass the daemon class and override the run() method."""
+
+    def __init__(self, pidfile, error_log_file='/dev/null'):
+        self.logging = logging
+        self.logging.basicConfig(filename=error_log_file, filemode='w',
+                                 format='%(name)s - %(levelname)s - %(message)s\n')
+        self.logging.getLogger().addHandler(logging.StreamHandler(sys.stdout))
+        self.error_log_file = error_log_file
+        self.pidfile = pidfile
+        self.commands = {}
+
+    def __enter__(self):
+        self.base_commands()
+        self.reg_command()
+
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        pass
+
+    def daemonize(self):
+        """Deamonize class. UNIX double fork mechanism."""
+
+        try:
+            pid = os.fork()
+            if pid > 0:
+                # exit first parent
+                sys.exit(0)
+        except OSError as err:
+            sys.stderr.write('fork #1 failed: {0}\n'.format(err))
+            self.logging.error('fork #1 failed: {0}\n'.format(err))
+            sys.exit(1)
+
+        # decouple from parent environment
+        os.chdir('/')
+        os.setsid()
+        os.umask(0)
+
+        # do second fork
+        try:
+            pid = os.fork()
+            if pid > 0:
+                # exit from second parent
+                sys.exit(0)
+        except OSError as err:
+            sys.stderr.write('fork #2 failed: {0}\n'.format(err))
+            self.logging.error('fork #2 failed: {0}\n'.format(err))
+            sys.exit(1)
+
+        # redirect standard file descriptors
+        sys.stdout.flush()
+        sys.stderr.flush()
+        si = open(os.devnull, 'r')
+        so = open(os.devnull, 'a+')
+        se = open(os.devnull, 'a+')
+
+        os.dup2(si.fileno(), sys.stdin.fileno())
+        os.dup2(so.fileno(), sys.stdout.fileno())
+        os.dup2(se.fileno(), sys.stderr.fileno())
+
+        # write pidfile
+        atexit.register(self.delpid)
+
+        pid = str(os.getpid())
+        with open(self.pidfile, 'w+') as f:
+            f.write(pid + '\n')
+
+    def delpid(self):
+        os.remove(self.pidfile)
+
+    def start(self):
+        """Start the daemon."""
+        self.logging.info("Start")
+
+        # Check for a pidfile to see if the daemon already runs
+        try:
+            with open(self.pidfile, 'r') as pf:
+
+                pid = int(pf.read().strip())
+        except IOError:
+            pid = None
+
+        if pid:
+            message = "pidfile {0} already exist. " + \
+                      "{warning}Daemon already running?{end}\n".format(warning=Bcolors.WARNING, end=Bcolors.ENDC)
+            sys.stderr.write(message.format(self.pidfile))
+            self.logging.error(message.format(self.pidfile))
+            sys.exit(1)
+
+        # Start the daemon
+        print("{green}The process {name} has been successfully launched{end}".format(name=self.pidfile, green=Bcolors.OKGREEN, end=Bcolors.ENDC))
+        self.daemonize()
+        self.run()
+
+    def stop(self):
+        """Stop the daemon."""
+        self.logging.info("Stop")
+
+        # Get the pid from the pidfile
+        try:
+            with open(self.pidfile, 'r') as pf:
+                pid = int(pf.read().strip())
+        except IOError:
+            pid = None
+
+        if not pid:
+            message = "pidfile {0} does not exist. " + \
+                      "Daemon not running?\n"
+            sys.stderr.write(message.format(self.pidfile))
+            self.logging.error(message.format(self.pidfile))
+            return  # not an error in a restart
+
+        # Try killing the daemon process
+        try:
+            while 1:
+                os.kill(pid, signal.SIGTERM)
+                time.sleep(0.1)
+        except OSError as err:
+            e = str(err.args)
+            if e.find("No such process") > 0:
+                if os.path.exists(self.pidfile):
+                    os.remove(self.pidfile)
+            else:
+                print(str(err.args))
+                sys.exit(1)
+
+    def restart(self):
+        """Restart the daemon."""
+        self.logging.info("Restart")
+        self.stop()
+        self.start()
+
+    def status(self):
+        print("Status")
+        try:
+            with open(self.pidfile, 'r') as pf:
+
+                pid = int(pf.read().strip())
+        except IOError:
+            pid = None
+
+        if pid:
+            print("Process started, name {name} | pid {pid}".format(pid=pid, name=self.pidfile))
+        else:
+            print("Process is not running")
+
+    def console_stdout(self):
+        sys.stdout = sys.__stdout__
+        print(123)
+
+    def process_command(self):
+        if len(sys.argv) > 1:
+            command = sys.argv[1]
+            handler = self.get_command_handler(command)
+            if handler:
+                handler()
+            else:
+                print("Unknown command: %s" % command)
+        else:
+            print("usage: %s start|stop|restart|status" % sys.argv[0])
+            sys.exit(2)
+
+    def base_commands(self):
+        self.add_command('start', self.start)
+        self.add_command('stop', self.stop)
+        self.add_command('restart', self.restart)
+        self.add_command('status', self.status)
+        self.add_command('console_stdout', self.console_stdout)
+
+    def add_command(self, command, handler):
+        if command not in self.commands:
+            self.commands[command] = handler
+
+    def get_command_handler(self, command):
+        if command in self.commands:
+            return self.commands[command]
+
+        return None
+
+    def reg_command(self):
+        pass
+
+    def run(self):
+        """You should override this method when you subclass Daemon.
+
+        It will be called after the process has been daemonized by
+        start() or restart()."""
+
+
+class Bcolors:
+    HEADER = '\033[95m'
+    OKBLUE = '\033[94m'
+    OKCYAN = '\033[96m'
+    OKGREEN = '\033[92m'
+    WARNING = '\033[93m'
+    FAIL = '\033[91m'
+    ENDC = '\033[0m'
+    BOLD = '\033[1m'
+    UNDERLINE = '\033[4m'

main.py

@@ -1,16 +1,16 @@
-# This is a sample Python script.
-
-# Press Shift+F10 to execute it or replace it with your code.
-# Press Double Shift to search everywhere for classes, files, tool windows, actions, and settings.
+import uvicorn
+from server import app
+from daemon.SimpleDaemon import Daemon
 
 
-def print_hi(name):
-    # Use a breakpoint in the code line below to debug your script.
-    print(f'Hi, {name}')  # Press Ctrl+F8 to toggle the breakpoint.
+class CdnServerDaemon(Daemon):
+    def run(self):
+        uvicorn.run("server:app", port=5000, log_level="info")
 
 
 # Press the green button in the gutter to run the script.
 if __name__ == '__main__':
-    print_hi('PyCharm')
+    with CdnServerDaemon('/tmp/daemon-cdn-server.pid', error_log_file='errlog.txt') as daemon:
+        daemon.process_command()
 
 # See PyCharm help at https://www.jetbrains.com/help/pycharm/

server.py

@@ -1,4 +1,5 @@
 from typing import Union, Annotated
+import uvicorn
 
 from fastapi import FastAPI, File, UploadFile, Form, Response, status
 
@@ -48,3 +49,7 @@ async def create_upload_file(file: UploadFile | None, package: Annotated[str, Fo
         file.file.close()
 
     return {"message": f"Successfully uploaded {file.filename}"}
+
+
+if __name__ == "__main__":
+    uvicorn.run("server:app", port=5000, log_level="info")