database-chassis python http-server implementation

dockers/docker-database/Dockerfile.j2

@@ -44,5 +44,6 @@ COPY ["files/supervisor-proc-exit-listener", "/usr/bin"]
 COPY ["files/sysctl-net.conf", "/etc/sysctl.d/"]
 COPY ["files/update_chassisdb_config", "/usr/local/bin/"]
 COPY ["flush_unused_database", "/usr/local/bin/"]
+COPY ["http-server", "/usr/local/bin/"]
 
 ENTRYPOINT ["/usr/local/bin/docker-database-init.sh"]

dockers/docker-database/http-server

@@ -0,0 +1,119 @@
+#!/usr/bin/python3
+#
+###########################################################################
+# http-server
+# 
+# Python HTTP Server service.
+# This service runs based on the configuration provided in
+# device/<platform>/chassisdb.conf
+#
+# Configuration parameters provided by chassisdb.conf are as follows:
+#
+# start_http_server: if "yes" or "1", http-server will be started on this
+#     node
+# chassis_db_address   : IP address for http-server. This is the same IP used
+#  for the chassis db server
+# http_server_port : Port to bind to, default: 8000
+# http_server_dir  : HTTP server home directory path, default: /var/www/
+#
+###########################################################################
+# Copyright (c) 2021-2022 Cisco Systems, Inc. and its affiliates.
+# All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+###########################################################################
+
+# Example of config:
+'''
+start_http_server=yes
+chassis_db_address=127.0.0.10
+http_server_port=8000
+http_server_dir=/var/www/tftp/
+'''
+
+import argparse
+import http.server
+import os
+import socketserver
+import subprocess
+import syslog
+
+from pathlib import Path
+
+HTTP_DEFAULT_BIND_PORT = "8000"
+HTTP_DEFAULT_DIR_PATH = '/var/www'
+http_dir = None
+
+class HTTPRequestHandler(http.server.SimpleHTTPRequestHandler):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, directory=http_dir, **kwargs)
+
+class HttpServer():
+    ''' HTTP server class implementation '''
+
+    def __init__(self, args, **kw):
+        self.http_config = {}
+        self.start_http_server = None
+
+        if args.config_file:
+            # Use config file provided from command line
+            platform_conf = args.config_file
+        else:
+            platform_conf=os.path.join('/usr/share/sonic/platform', 'chassisdb.conf')
+
+        syslog.syslog(syslog.LOG_INFO,'HTTP Server config file:{}'.format(platform_conf))
+        if os.path.isfile(platform_conf):
+            with open(platform_conf) as f:
+                for line in f.readlines():
+                    (key, _, value) = line.strip().replace('"','').partition("=")
+                    self.http_config[key] = value
+        else:
+            syslog.syslog(syslog.LOG_INFO, 'HTTP server config file {} not present - exiting...'.format(platform_conf))
+            exit(0)
+
+        self.http_server_ip = self.http_config.get('chassis_db_address')
+        if self.http_server_ip:
+            global http_dir
+            self.start_http_server = self.http_config.get('start_http_server')
+            http_dir = self.http_config.get('http_server_dir', HTTP_DEFAULT_DIR_PATH)
+
+            # Get Server port from config
+            self.http_server_port = int(self.http_config.get('http_server_port', HTTP_DEFAULT_BIND_PORT))
+
+            # Create HTTP home dir path if not present
+            path = Path(http_dir)
+            path.mkdir(parents=True, exist_ok=True)
+
+    def run(self):
+        ''' start the http-server if start_http_server is set in config file '''
+
+        if self.start_http_server == 'yes' or self.start_http_server == '1':
+            # Start the http-server, generally on the Supervisor card.
+            syslog.syslog(syslog.LOG_INFO, 'start_http_server is set, starting http-server')
+            if self.http_config:
+                with socketserver.TCPServer((self.http_server_ip, self.http_server_port), HTTPRequestHandler) as httpd:
+                    syslog.syslog(syslog.LOG_INFO, 'HTTP Server Port:{} home:{}'.format(self.http_server_port, http_dir))
+                    httpd.serve_forever()
+        else:
+            syslog.syslog(syslog.LOG_INFO, 'start_http_server is not set, exiting...')
+
+def main():
+    parser = argparse.ArgumentParser(description='Python3 HTTP Server')
+    parser.add_argument('--config-file', help='HTTP Server config yaml file', default=None)
+    args = parser.parse_args()
+
+    HttpServer(args).run()
+
+if __name__ == '__main__':
+    main()

dockers/docker-database/supervisord.conf.j2

@@ -56,3 +56,23 @@ stdout_logfile=syslog
 stderr_logfile=syslog
 dependent_startup=true
 dependent_startup_wait_for=rsyslogd:running
+
+{% if INSTANCES %}
+{%     for redis_inst, redis_items in INSTANCES.items() %}
+{%-        if redis_inst == 'redis_chassis' %}
+[program: http-server]
+; http-server should run only on database-chassis which hosts redis_chassis server.
+; Using 2 sec sleep in command to give the process enough run time to reach
+; RUNNING state when the process needs to exit with status 0 when start_http_server
+; config is not set.
+command=/bin/bash -c "sleep 2 && python3 /usr/local/bin/http-server"
+priority=3
+autostart=true
+autorestart=unexpected
+stdout_logfile=syslog
+stderr_logfile=syslog
+dependent_startup=true
+dependent_startup_wait_for=rsyslogd:running
+{%-        endif %}
+{%-    endfor %}
+{% endif %}

rules/docker-database.mk

@@ -28,6 +28,7 @@ $(DOCKER_DATABASE)_CONTAINER_NAME = database
 $(DOCKER_DATABASE)_RUN_OPT += --privileged -t
 $(DOCKER_DATABASE)_RUN_OPT += -v /etc/sonic:/etc/sonic:ro
 $(DOCKER_DATABASE)_RUN_OPT += -v /etc/timezone:/etc/timezone:ro
+$(DOCKER_DATABASE)_RUN_OPT += -v /var/www/:/var/www/:ro
 
 $(DOCKER_DATABASE)_BASE_IMAGE_FILES += redis-cli:/usr/bin/redis-cli
 $(DOCKER_DATABASE)_FILES += $(SYSCTL_NET_CONFIG) $(SUPERVISOR_PROC_EXIT_LISTENER_SCRIPT)