Code normalization

- New debug checks
- Normalization

Author: dmitry-lipetsk

testgres/operations/local_ops.py

@@ -86,25 +86,32 @@ def _run_command__generic(self, cmd, shell, input, stdin, stdout, stderr, get_pr
         if not get_process:
             input_prepared = Helpers.PrepareProcessInput(input, encoding)  # throw
 
+        assert input_prepared is None or (type(input_prepared) == bytes)  # noqa: E721
+
         process = subprocess.Popen(
             cmd,
             shell=shell,
             stdin=stdin or subprocess.PIPE if input is not None else None,
             stdout=stdout or subprocess.PIPE,
             stderr=stderr or subprocess.PIPE,
         )
+        assert not (process is None)
         if get_process:
             return process, None, None
         try:
             output, error = process.communicate(input=input_prepared, timeout=timeout)
-            if encoding:
-                output = output.decode(encoding)
-                error = error.decode(encoding)
-            return process, output, error
         except subprocess.TimeoutExpired:
             process.kill()
             raise ExecUtilException("Command timed out after {} seconds.".format(timeout))
 
+        assert type(output) == bytes  # noqa: E721
+        assert type(error) == bytes  # noqa: E721
+
+        if encoding:
+            output = output.decode(encoding)
+            error = error.decode(encoding)
+        return process, output, error
+
     def _run_command(self, cmd, shell, input, stdin, stdout, stderr, get_process, timeout, encoding):
         """Execute a command and return the process and its output."""
         if os.name == 'nt' and stdout is None:  # Windows

testgres/operations/remote_ops.py

@@ -75,12 +75,15 @@ def exec_command(self, cmd, wait_exit=False, verbose=False, expect_error=False,
         if not get_process:
             input_prepared = Helpers.PrepareProcessInput(input, encoding)  # throw
 
+        assert input_prepared is None or (type(input_prepared) == bytes)  # noqa: E721
+
         ssh_cmd = []
         if isinstance(cmd, str):
             ssh_cmd = ['ssh', self.ssh_dest] + self.ssh_args + [cmd]
         elif isinstance(cmd, list):
             ssh_cmd = ['ssh', self.ssh_dest] + self.ssh_args + cmd
         process = subprocess.Popen(ssh_cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        assert not (process is None)
         if get_process:
             return process