fix bug:correct handle when meets PermissionError (#460)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **Bug Fixes**
  - Improved log file path creation logic to enhance reliability.
  - Added detailed log messages for file initialization.
- Enhanced error handling for permission issues when creating log files.
  - Adjusted log handlers for better log management.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

dpdispatcher/dlog.py

@@ -6,21 +6,25 @@
 dlog = logging.getLogger("dpdispatcher")
 dlog.propagate = False
 dlog.setLevel(logging.INFO)
+cwd_logfile_path = os.path.join(os.getcwd(), "dpdispatcher.log")
+dlogf = logging.FileHandler(cwd_logfile_path, delay=True)
 try:
- dlogf = logging.FileHandler(
- os.getcwd() + os.sep + "dpdispatcher" + ".log", delay=True
- )
+ dlog.addHandler(dlogf)
+ dlog.info(f"LOG INIT:dpdispatcher log direct to {cwd_logfile_path}")
 except PermissionError:
+ dlog.removeHandler(dlogf)
  warnings.warn(
- "dpdispatcher.log meet permission error. redirect the log to ~/dpdispatcher.log"
+ f"dump logfile dpdispatcher.log to {cwd_logfile_path} meet permission error. redirect the log to ~/dpdispatcher.log"
  )
  dlogf = logging.FileHandler(
  os.path.join(os.path.expanduser("~"), "dpdispatcher.log"), delay=True
  )
+ dlog.addHandler(dlogf)
+ dlog.info("LOG INIT:dpdispatcher log init at ~/dpdispatcher.log")
 
 dlogf_formatter = logging.Formatter("%(asctime)s - %(levelname)s : %(message)s")
 dlogf.setFormatter(dlogf_formatter)
-dlog.addHandler(dlogf)
+# dlog.addHandler(dlogf)
 
 dlog_stdout = logging.StreamHandler(sys.stdout)
 dlog_stdout.setFormatter(dlogf_formatter)