Added some supervisord experiments

.gitignore

@@ -61,3 +61,8 @@ target/
 #Pycharm
 .idea/
 
+# Supervisor
+supervisord/supervisord.log
+supervisord/supervisord.pid
+supervisord/var/supervisor.sock
+supervisord/log/*

data_structures/buffers.py

@@ -0,0 +1,34 @@
+import logging
+
+logging.basicConfig(level=logging.DEBUG)
+logger = logging.getLogger(__name__)
+
+
+class RingBuffer:
+    """Implements a basic Ring Buffer type."""
+
+    def __init__(self, size):
+        self._data = bytearray(size)
+        self.size = size
+        self.put_index = 0
+        self.get_index = 0
+
+    def put(self, value):
+        _next_index = (self.put_index + 1) % self.size
+        # check for overflow
+        if self.get_index != _next_index:
+            self._data[self.put_index] = value
+            self.put_index = _next_index
+            logger.debug(f'get_index:{self.get_index}, put_index:{self.put_index}')
+            logger.debug(str(self._data))
+            return value
+        else:
+            return None
+
+    def get(self):
+        if self.get_index == self.put_index:
+            return None  ## buffer empty
+        else:
+            value = self._data[self.get_index]
+            self.get_index = (self.get_index + 1) % self.size
+            return value

data_structures/utils.py

@@ -0,0 +1,32 @@
+import sys
+from numbers import Number
+from collections import Set, Mapping, deque
+
+zero_depth_bases = (str, bytes, Number, range, bytearray)
+iteritems = 'items'
+
+
+def getsize(obj_0):
+    """Recursively iterate to sum size of object & members."""
+    _seen_ids = set()
+
+    def inner(obj):
+        obj_id = id(obj)
+        if obj_id in _seen_ids:
+            return 0
+        _seen_ids.add(obj_id)
+        size = sys.getsizeof(obj)
+        if isinstance(obj, zero_depth_bases):
+            pass  # bypass remaining control flow and return
+        elif isinstance(obj, (tuple, list, Set, deque)):
+            size += sum(inner(i) for i in obj)
+        elif isinstance(obj, Mapping) or hasattr(obj, iteritems):
+            size += sum(inner(k) + inner(v) for k, v in getattr(obj, iteritems)())
+        # Check for custom object instances - may subclass above too
+        if hasattr(obj, '__dict__'):
+            size += inner(vars(obj))
+        if hasattr(obj, '__slots__'):  # can have __slots__ with __dict__
+            size += sum(inner(getattr(obj, s)) for s in obj.__slots__ if hasattr(obj, s))
+        return size
+
+    return inner(obj_0)

supervisord/bin/simple1.py

@@ -0,0 +1,18 @@
+import logging
+
+from flask import Flask, request
+
+log = logging.getLogger(__name__)
+logging.basicConfig(level=logging.INFO)
+
+app = Flask(__name__)
+
+
+@app.route('/')
+def index():
+    log.warning('Got a request from: {}'.format(request.remote_addr))
+    return {'msg': 'pong simple1'}
+
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0')

supervisord/bin/simple2.py

@@ -0,0 +1,18 @@
+import logging
+
+from flask import Flask, request
+
+log = logging.getLogger(__name__)
+logging.basicConfig(level=logging.INFO)
+
+app = Flask(__name__)
+
+
+@app.route('/')
+def index():
+    log.info('Got a request from: {}'.format(request.remote_addr))
+    return {'msg': 'pong simple2'}
+
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=5001)

supervisord/etc/supervisord.conf

@@ -0,0 +1,36 @@
+[supervisord]
+
+[rpcinterface:supervisor]
+supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
+
+[inet_http_server]
+port = 127.0.0.1:9001
+username = user
+password = 123
+
+[unix_http_server]
+file=%(here)s/../var/supervisor.sock   ; the path to the socket file
+;chmod=0700                 ; socket file mode (default 0700)
+;chown=nobody:nogroup       ; socket file uid:gid owner
+;username=user              ; default is no username (open server)
+;password=123               ; default is no password (open server)
+
+[supervisorctl]
+serverurl=unix://%(here)s/../var/supervisor.sock ; use a unix:// URL  for a unix socket
+
+[program:simple1]
+;command=python %(here)s/../bin/simple1.py
+command=gunicorn -w 4 -b 0.0.0.0:5000 bin.simple1:app
+directory=%(here)s/..
+autorestart=yes
+startretries=3
+stdout_logfile=%(here)s/../log/simple1.log
+redirect_stderr=true
+
+[program:simple2]
+command=gunicorn -w 4 -b 0.0.0.0:5001 bin.simple2:app
+directory=%(here)s/..
+autorestart=yes
+startretries=3
+stdout_logfile=%(here)s/../log/simple2.log
+redirect_stderr=true

supervisord/etc/supervisord.conf.example

@@ -0,0 +1,170 @@
+; Sample supervisor config file.
+;
+; For more information on the config file, please see:
+; http://supervisord.org/configuration.html
+;
+; Notes:
+;  - Shell expansion ("~" or "$HOME") is not supported.  Environment
+;    variables can be expanded using this syntax: "%(ENV_HOME)s".
+;  - Quotes around values are not supported, except in the case of
+;    the environment= options as shown below.
+;  - Comments must have a leading space: "a=b ;comment" not "a=b;comment".
+;  - Command will be truncated if it looks like a config file comment, e.g.
+;    "command=bash -c 'foo ; bar'" will truncate to "command=bash -c 'foo ".
+;
+; Warning:
+;  Paths throughout this example file use /tmp because it is available on most
+;  systems.  You will likely need to change these to locations more appropriate
+;  for your system.  Some systems periodically delete older files in /tmp.
+;  Notably, if the socket file defined in the [unix_http_server] section below
+;  is deleted, supervisorctl will be unable to connect to supervisord.
+
+[unix_http_server]
+file=/tmp/supervisor.sock   ; the path to the socket file
+;chmod=0700                 ; socket file mode (default 0700)
+;chown=nobody:nogroup       ; socket file uid:gid owner
+;username=user              ; default is no username (open server)
+;password=123               ; default is no password (open server)
+
+; Security Warning:
+;  The inet HTTP server is not enabled by default.  The inet HTTP server is
+;  enabled by uncommenting the [inet_http_server] section below.  The inet
+;  HTTP server is intended for use within a trusted environment only.  It
+;  should only be bound to localhost or only accessible from within an
+;  isolated, trusted network.  The inet HTTP server does not support any
+;  form of encryption.  The inet HTTP server does not use authentication
+;  by default (see the username= and password= options to add authentication).
+;  Never expose the inet HTTP server to the public internet.
+
+;[inet_http_server]         ; inet (TCP) server disabled by default
+;port=127.0.0.1:9001        ; ip_address:port specifier, *:port for all iface
+;username=user              ; default is no username (open server)
+;password=123               ; default is no password (open server)
+
+[supervisord]
+logfile=/tmp/supervisord.log ; main log file; default $CWD/supervisord.log
+logfile_maxbytes=50MB        ; max main logfile bytes b4 rotation; default 50MB
+logfile_backups=10           ; # of main logfile backups; 0 means none, default 10
+loglevel=info                ; log level; default info; others: debug,warn,trace
+pidfile=/tmp/supervisord.pid ; supervisord pidfile; default supervisord.pid
+nodaemon=false               ; start in foreground if true; default false
+silent=false                 ; no logs to stdout if true; default false
+minfds=1024                  ; min. avail startup file descriptors; default 1024
+minprocs=200                 ; min. avail process descriptors;default 200
+;umask=022                   ; process file creation umask; default 022
+;user=supervisord            ; setuid to this UNIX account at startup; recommended if root
+;identifier=supervisor       ; supervisord identifier, default is 'supervisor'
+;directory=/tmp              ; default is not to cd during start
+;nocleanup=true              ; don't clean up tempfiles at start; default false
+;childlogdir=/tmp            ; 'AUTO' child log dir, default $TEMP
+;environment=KEY="value"     ; key value pairs to add to environment
+;strip_ansi=false            ; strip ansi escape codes in logs; def. false
+
+; The rpcinterface:supervisor section must remain in the config file for
+; RPC (supervisorctl/web interface) to work.  Additional interfaces may be
+; added by defining them in separate [rpcinterface:x] sections.
+
+[rpcinterface:supervisor]
+supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
+
+; The supervisorctl section configures how supervisorctl will connect to
+; supervisord.  configure it match the settings in either the unix_http_server
+; or inet_http_server section.
+
+[supervisorctl]
+serverurl=unix:///tmp/supervisor.sock ; use a unix:// URL  for a unix socket
+;serverurl=http://127.0.0.1:9001 ; use an http:// url to specify an inet socket
+;username=chris              ; should be same as in [*_http_server] if set
+;password=123                ; should be same as in [*_http_server] if set
+;prompt=mysupervisor         ; cmd line prompt (default "supervisor")
+;history_file=~/.sc_history  ; use readline history if available
+
+; The sample program section below shows all possible program subsection values.
+; Create one or more 'real' program: sections to be able to control them under
+; supervisor.
+
+;[program:theprogramname]
+;command=/bin/cat              ; the program (relative uses PATH, can take args)
+;process_name=%(program_name)s ; process_name expr (default %(program_name)s)
+;numprocs=1                    ; number of processes copies to start (def 1)
+;directory=/tmp                ; directory to cwd to before exec (def no cwd)
+;umask=022                     ; umask for process (default None)
+;priority=999                  ; the relative start priority (default 999)
+;autostart=true                ; start at supervisord start (default: true)
+;startsecs=1                   ; # of secs prog must stay up to be running (def. 1)
+;startretries=3                ; max # of serial start failures when starting (default 3)
+;autorestart=unexpected        ; when to restart if exited after running (def: unexpected)
+;exitcodes=0                   ; 'expected' exit codes used with autorestart (default 0)
+;stopsignal=QUIT               ; signal used to kill process (default TERM)
+;stopwaitsecs=10               ; max num secs to wait b4 SIGKILL (default 10)
+;stopasgroup=false             ; send stop signal to the UNIX process group (default false)
+;killasgroup=false             ; SIGKILL the UNIX process group (def false)
+;user=chrism                   ; setuid to this UNIX account to run the program
+;redirect_stderr=true          ; redirect proc stderr to stdout (default false)
+;stdout_logfile=/a/path        ; stdout log path, NONE for none; default AUTO
+;stdout_logfile_maxbytes=1MB   ; max # logfile bytes b4 rotation (default 50MB)
+;stdout_logfile_backups=10     ; # of stdout logfile backups (0 means none, default 10)
+;stdout_capture_maxbytes=1MB   ; number of bytes in 'capturemode' (default 0)
+;stdout_events_enabled=false   ; emit events on stdout writes (default false)
+;stdout_syslog=false           ; send stdout to syslog with process name (default false)
+;stderr_logfile=/a/path        ; stderr log path, NONE for none; default AUTO
+;stderr_logfile_maxbytes=1MB   ; max # logfile bytes b4 rotation (default 50MB)
+;stderr_logfile_backups=10     ; # of stderr logfile backups (0 means none, default 10)
+;stderr_capture_maxbytes=1MB   ; number of bytes in 'capturemode' (default 0)
+;stderr_events_enabled=false   ; emit events on stderr writes (default false)
+;stderr_syslog=false           ; send stderr to syslog with process name (default false)
+;environment=A="1",B="2"       ; process environment additions (def no adds)
+;serverurl=AUTO                ; override serverurl computation (childutils)
+
+; The sample eventlistener section below shows all possible eventlistener
+; subsection values.  Create one or more 'real' eventlistener: sections to be
+; able to handle event notifications sent by supervisord.
+
+;[eventlistener:theeventlistenername]
+;command=/bin/eventlistener    ; the program (relative uses PATH, can take args)
+;process_name=%(program_name)s ; process_name expr (default %(program_name)s)
+;numprocs=1                    ; number of processes copies to start (def 1)
+;events=EVENT                  ; event notif. types to subscribe to (req'd)
+;buffer_size=10                ; event buffer queue size (default 10)
+;directory=/tmp                ; directory to cwd to before exec (def no cwd)
+;umask=022                     ; umask for process (default None)
+;priority=-1                   ; the relative start priority (default -1)
+;autostart=true                ; start at supervisord start (default: true)
+;startsecs=1                   ; # of secs prog must stay up to be running (def. 1)
+;startretries=3                ; max # of serial start failures when starting (default 3)
+;autorestart=unexpected        ; autorestart if exited after running (def: unexpected)
+;exitcodes=0                   ; 'expected' exit codes used with autorestart (default 0)
+;stopsignal=QUIT               ; signal used to kill process (default TERM)
+;stopwaitsecs=10               ; max num secs to wait b4 SIGKILL (default 10)
+;stopasgroup=false             ; send stop signal to the UNIX process group (default false)
+;killasgroup=false             ; SIGKILL the UNIX process group (def false)
+;user=chrism                   ; setuid to this UNIX account to run the program
+;redirect_stderr=false         ; redirect_stderr=true is not allowed for eventlisteners
+;stdout_logfile=/a/path        ; stdout log path, NONE for none; default AUTO
+;stdout_logfile_maxbytes=1MB   ; max # logfile bytes b4 rotation (default 50MB)
+;stdout_logfile_backups=10     ; # of stdout logfile backups (0 means none, default 10)
+;stdout_events_enabled=false   ; emit events on stdout writes (default false)
+;stdout_syslog=false           ; send stdout to syslog with process name (default false)
+;stderr_logfile=/a/path        ; stderr log path, NONE for none; default AUTO
+;stderr_logfile_maxbytes=1MB   ; max # logfile bytes b4 rotation (default 50MB)
+;stderr_logfile_backups=10     ; # of stderr logfile backups (0 means none, default 10)
+;stderr_events_enabled=false   ; emit events on stderr writes (default false)
+;stderr_syslog=false           ; send stderr to syslog with process name (default false)
+;environment=A="1",B="2"       ; process environment additions
+;serverurl=AUTO                ; override serverurl computation (childutils)
+
+; The sample group section below shows all possible group values.  Create one
+; or more 'real' group: sections to create "heterogeneous" process groups.
+
+;[group:thegroupname]
+;programs=progname1,progname2  ; each refers to 'x' in [program:x] definitions
+;priority=999                  ; the relative start priority (default 999)
+
+; The [include] section can just contain the "files" setting.  This
+; setting can list multiple files (separated by whitespace or
+; newlines).  It can also contain wildcards.  The filenames are
+; interpreted as relative to this file.  Included files *cannot*
+; include files themselves.
+
+;[include]
+;files = relative/directory/*.ini

supervisord/requirements.txt

@@ -0,0 +1,3 @@
+flask
+gunicorn
+requests