sma: load configuration from file

This patch adds support for loading configuration from a yaml-formatted
file.  The command-line options takes precedence over those from the
config file.

Signed-off-by: Konrad Sztyber <konrad.sztyber@intel.com>
Change-Id: Iafb5b4aec0a64afe358fce2d6c55361fc4093223
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/11712
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Karol Latecki <karol.latecki@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Monica Kenguva <monica.kenguva@intel.com>

scripts/pkgdep/arch.sh

@@ -11,6 +11,7 @@ pip install ijson
 pip install python-magic
 pip install grpcio
 pip install grpcio-tools
+pip install pyyaml
 # Additional dependencies for DPDK
 pacman -Sy --needed --noconfirm numactl nasm
 # Additional dependencies for ISA-L used in compression

scripts/pkgdep/debian.sh

@@ -17,6 +17,7 @@ pip3 install ijson
 pip3 install python-magic
 pip3 install grpcio
 pip3 install grpcio-tools
+pip3 install pyyaml
 # Additional dependencies for SPDK CLI - not available on older Ubuntus
 apt-get install -y python3-configshell-fb python3-pexpect || echo \
 	"Note: Some SPDK CLI dependencies could not be installed."

scripts/pkgdep/rhel.sh

@@ -105,6 +105,7 @@ pip3 install ijson
 pip3 install python-magic
 pip3 install grpcio
 pip3 install grpcio-tools
+pip3 install pyyaml
 
 # Additional dependencies for SPDK CLI - not available in rhel and centos
 if ! echo "$ID $VERSION_ID" | grep -E -q 'rhel 7|centos 7'; then

scripts/sma.py

@@ -5,6 +5,7 @@ import importlib
 import logging
 import os
 import sys
+import yaml
 
 sys.path.append(os.path.dirname(__file__) + '/../python')
 
@@ -12,15 +13,34 @@ import spdk.sma as sma                      # noqa
 from spdk.rpc.client import JSONRPCClient   # noqa
 
 
+def parse_config(path):
+    if path is None:
+        return {}
+    with open(path, 'r') as cfgfile:
+        config = yaml.load(cfgfile, Loader=yaml.FullLoader)
+        return {**config} if config is not None else {}
+
+
 def parse_argv():
     parser = ArgumentParser(description='Storage Management Agent command line interface')
-    parser.add_argument('--address', '-a', default='localhost',
-                        help='IP address to listen on')
-    parser.add_argument('--socket', '-s', default='/var/tmp/spdk.sock',
-                        help='SPDK RPC socket')
-    parser.add_argument('--port', '-p', default=8080, type=int,
-                        help='IP port to listen on')
-    return parser.parse_args()
+    parser.add_argument('--address', '-a', help='IP address to listen on')
+    parser.add_argument('--socket', '-s', help='SPDK RPC socket')
+    parser.add_argument('--port', '-p', type=int, help='IP port to listen on')
+    parser.add_argument('--config', '-c', help='Path to config file')
+    defaults = {'address': 'localhost',
+                'socket': '/var/tmp/spdk.sock',
+                'port': 8080}
+    # Merge the default values, config file, and the command-line
+    args = vars(parser.parse_args())
+    config = parse_config(args.get('config'))
+    for argname, argvalue in defaults.items():
+        if args.get(argname) is not None:
+            if config.get(argname) is not None:
+                logging.info(f'Overriding "{argname}" value from command-line')
+            config[argname] = args[argname]
+        if config.get(argname) is None:
+            config[argname] = argvalue
+    return config
 
 
 def get_build_client(sock):
@@ -44,10 +64,12 @@ def load_plugins(agent, client, plugins):
 
 
 if __name__ == '__main__':
-    argv = parse_argv()
     logging.basicConfig(level=os.environ.get('SMA_LOGLEVEL', 'WARNING').upper())
-    agent = sma.StorageManagementAgent(argv.address, argv.port)
-    register_device(agent, sma.NvmfTcpDeviceManager(get_build_client(argv.socket)))
-    load_plugins(agent, get_build_client(argv.socket),
+
+    config = parse_argv()
+    agent = sma.StorageManagementAgent(config['address'], config['port'])
+    register_device(agent, sma.NvmfTcpDeviceManager(get_build_client(config['socket'])))
+    load_plugins(agent, get_build_client(config['socket']), config.get('plugins') or [])
+    load_plugins(agent, get_build_client(config['socket']),
                  filter(None, os.environ.get('SMA_PLUGINS', '').split(':')))
     agent.run()