Merge branch 'feature/ghi-#7-cli' into develop

snowsaw/cli.py

@@ -0,0 +1,106 @@
+"""
+The snowsaw CLI.
+
+This is the main entry point of the public API.
+"""
+from argparse import ArgumentParser
+import glob
+import os
+
+from .config import ConfigReader, ReadingError
+from .dispatcher import Dispatcher, DispatchError
+from .logging import Level
+from .logging import Logger
+from .util import module
+
+
+def add_options(parser):
+    """
+    Adds all options to the specified parser.
+
+    :param parser: The parser to add all options to
+    :return: None
+    """
+    parser.add_argument('-Q', '--super-quiet', dest='super_quiet', action='store_true', help='suppress almost all output')
+    parser.add_argument('-q', '--quiet', dest='quiet', action='store_true', help='suppress most output')
+    parser.add_argument('-v', '--verbose', dest='verbose', action='store_true', help='enable verbose output')
+    parser.add_argument('-s', '--snowblocks-directory', nargs=1, dest='snowblocks_directory',
+                        help='base snowblock directory to run all tasks of', metavar='SNOWBLOCKSDIR', required=True)
+    parser.add_argument('-c', '--config-file', nargs=1, dest='config_file', help='run tasks for the specified snowblock', metavar='CONFIGFILE')
+    parser.add_argument('-p', '--plugin', action='append', dest='plugins', default=[], help='load PLUGIN as a plugin', metavar='PLUGIN')
+    parser.add_argument('--disable-core-plugins', dest='disable_core_plugins', action='store_true', help='disable all core plugins')
+    parser.add_argument('--plugin-dir', action='append', dest='plugin_dirs', default=[], metavar='PLUGIN_DIR', help='load all plugins in PLUGIN_DIR')
+
+
+def read_config(config_file):
+    """
+    Reads the specified configuration file.
+
+    :param config_file: The configuration file to read
+    :return: The read configuration data
+    """
+    reader = ConfigReader(config_file)
+    return reader.get_config()
+
+
+def main():
+    """
+    Processes all parsed options and hands it over to the dispatcher for each snowblock.
+
+    :return: True if all tasks have been executed successfully, False otherwise
+    """
+    log = Logger()
+    try:
+        parser = ArgumentParser()
+        snowblock_config_filename = "snowblock.json"
+        add_options(parser)
+        options = parser.parse_args()
+
+        if options.super_quiet:
+            log.set_level(Level.WARNING)
+        if options.quiet:
+            log.set_level(Level.INFO)
+        if options.verbose:
+            log.set_level(Level.DEBUG)
+
+        plugin_directories = list(options.plugin_dirs)
+        if not options.disable_core_plugins:
+            plugin_directories.append(os.path.join(os.path.dirname(__file__), "plugins"))
+        plugin_paths = []
+        for directory in plugin_directories:
+            for plugin_path in glob.glob(os.path.join(directory, "*.py")):
+                plugin_paths.append(plugin_path)
+        for plugin_path in options.plugins:
+            plugin_paths.append(plugin_path)
+        for plugin_path in plugin_paths:
+            abspath = os.path.abspath(plugin_path)
+            module.load(abspath)
+
+        if options.config_file:
+            snowblocks = [os.path.basename(os.path.dirname(options.config_file[0]))]
+        else:
+            snowblocks = [snowblock for snowblock in os.listdir(options.snowblocks_directory[0])
+                          if os.path.isdir(os.path.join(options.snowblocks_directory[0], snowblock))]
+
+        for snowblock in snowblocks:
+            if os.path.isfile(os.path.join(snowblock, snowblock_config_filename)):
+                log.info("❄ {}".format(snowblock))
+                tasks = read_config(os.path.join(snowblock, snowblock_config_filename))
+
+                if not isinstance(tasks, list):
+                    raise ReadingError("Configuration file must be a list of tasks")
+
+                dispatcher = Dispatcher(snowblock)
+                success = dispatcher.dispatch(tasks)
+                if success:
+                    log.info("==> All tasks executed successfully\n")
+                else:
+                    raise DispatchError("\n==> Some tasks were not executed successfully")
+            else:
+                log.lowinfo("Skipped snowblock \"{}\": No configuration file found".format(snowblock))
+    except (ReadingError, DispatchError) as e:
+        log.error("{}".format(e))
+        exit(1)
+    except KeyboardInterrupt:
+        log.error("\n==> Operation aborted")
+        exit(1)