Use concurrent.futures for concurrency with thread and process (#87)

Use concurrent.futures for multiprocessing and other improvements
- combination with thread pool for downloading and  process pool for extraction.
- Iterate all download and start extraction.
- Start extraction when download completed
- Add download completion log
- log a time  when extraction done
- Show elasped time for installation
- Meature elasped time
  * use perf_counter() for a total elapsed time.
  * use process_time() for individual extractions.

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

* fix format specifier

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

aqt/cli.py

@@ -24,7 +24,7 @@ import argparse
 import logging
 import logging.config
 import os
-import sys
+import time
 
 from packaging.version import Version, parse
 
@@ -100,6 +100,7 @@ class Cli():
         return all([m in available for m in modules])
 
     def run_install(self, args):
+        start_time = time.perf_counter()
         arch = args.arch
         target = args.target
         os_name = args.host
@@ -119,11 +120,11 @@ class Cli():
             self.logger.warning("Some of specified modules are unknown.")
         QtInstaller(QtArchives(os_name, target, qt_version, arch, modules=modules, mirror=mirror, logging=self.logger,
                                all_extra=all_extra),
-                    logging=self.logger).install(command=sevenzip, target_dir=output_dir)
-        sys.stdout.write("\033[K")
-        print("Finished installation")
+                    logging=self.logger, command=sevenzip, target_dir=output_dir).install()
+        self.logger.info("Time elasped: {time:.8f} second".format(time=time.perf_counter() - start_time))
 
     def run_tool(self, args):
+        start_time = time.perf_counter()
         arch = args.arch
         tool_name = args.tool_name
         os_name = args.host
@@ -135,9 +136,8 @@ class Cli():
         if not self._check_tools_arg_combination(os_name, tool_name, arch):
             self.logger.warning("Specified target combination is not valid: {} {} {}".format(os_name, tool_name, arch))
         QtInstaller(ToolArchives(os_name, tool_name, version, arch, mirror=mirror, logging=self.logger),
-                    logging=self.logger).install(command=sevenzip, target_dir=output_dir)
-    sys.stdout.write("\033[K")
-    print("Finished installation")
+                    logging=self.logger, command=sevenzip, target_dir=output_dir).install()
+        self.logger.info("Time elasped: {time:.8f} second".format(time=time.perf_counter() - start_time))
 
     def run_list(self, args):
         print('List Qt packages for %s' % args.qt_version)