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arches/gunicorn_config.py

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+# Copied from:
+# https://github.com/archesproject/arches/blob/dev/7.6.x/docker/gunicorn_config.py
+# 
+# NOTE: This does NOT work and will throw errors with urls.py if used as is.
+# Edit this to customize Gunicorn settings
+
+
+import os
+from django.core.exceptions import ImproperlyConfigured
+
+
+def get_optional_env_variable(var_name):
+    try:
+        return os.environ[var_name]
+    except KeyError:
+        return None
+
+
+#
+# Server socket
+#
+#   bind - The socket to bind.
+#
+#       A string of the form: 'HOST', 'HOST:PORT', 'unix:PATH'.
+#       An IP is a valid HOST.
+#
+#   backlog - The number of pending connections. This refers
+#       to the number of clients that can be waiting to be
+#       served. Exceeding this number results in the client
+#       getting an error when attempting to connect. It should
+#       only affect servers under significant load.
+#
+#       Must be a positive integer. Generally set in the 64-2048
+#       range.
+#
+
+django_port = get_optional_env_variable("DJANGO_PORT")
+listen_port = django_port or "8000"
+bind = "0.0.0.0:" + listen_port
+
+backlog = get_optional_env_variable("GUNICORN_BACKLOG") or 2048
+
+#
+# Worker processes
+#
+#   workers - The number of worker processes that this server
+#       should keep alive for handling requests.
+#
+#       A positive integer generally in the 2-4 x $(NUM_CORES)
+#       range. You'll want to vary this a bit to find the best
+#       for your particular application's work load.
+#
+#   worker_class - The type of workers to use. The default
+#       sync class should handle most 'normal' types of work
+#       loads. You'll want to read
+#       http://docs.gunicorn.org/en/latest/design.html#choosing-a-worker-type
+#       for information on when you might want to choose one
+#       of the other worker classes.
+#
+#       A string referring to a Python path to a subclass of
+#       gunicorn.workers.base.Worker. The default provided values
+#       can be seen at
+#       http://docs.gunicorn.org/en/latest/settings.html#worker-class
+#
+#   worker_connections - For the eventlet and gevent worker classes
+#       this limits the maximum number of simultaneous clients that
+#       a single process can handle.
+#
+#       A positive integer generally set to around 1000.
+#
+#   timeout - If a worker does not notify the master process in this
+#       number of seconds it is killed and a new worker is spawned
+#       to replace it.
+#
+#       Generally set to thirty seconds. Only set this noticeably
+#       higher if you're sure of the repercussions for sync workers.
+#       For the non sync workers it just means that the worker
+#       process is still communicating and is not tied to the length
+#       of time required to handle a single request.
+#
+#   keepalive - The number of seconds to wait for the next request
+#       on a Keep-Alive HTTP connection.
+#
+#       A positive integer. Generally set in the 1-5 seconds range.
+#
+
+workers = get_optional_env_variable("GUNICORN_WORKERS") or 2
+worker_class = get_optional_env_variable("GUNICORN_WORKER_CLASS") or "sync"
+worker_connections = get_optional_env_variable("GUNICORN_WORKER_CONNECTIONS") or 1000
+timeout = get_optional_env_variable("GUNICORN_WORKER_TIMEOUT") or 30
+keepalive = get_optional_env_variable("GUNICORN_KEEPALIVE") or 2
+
+#
+#   spew - Install a trace function that spews every line of Python
+#       that is executed when running the server. This is the
+#       nuclear option.
+#
+#       True or False
+#
+
+spew = get_optional_env_variable("GUNICORN_SPEW") or False
+
+#
+# Server mechanics
+#
+#   daemon - Detach the main Gunicorn process from the controlling
+#       terminal with a standard fork/fork sequence.
+#
+#       True or False
+#
+#   raw_env - Pass environment variables to the execution environment.
+#
+#   pidfile - The path to a pid file to write
+#
+#       A path string or None to not write a pid file.
+#
+#   user - Switch worker processes to run as this user.
+#
+#       A valid user id (as an integer) or the name of a user that
+#       can be retrieved with a call to pwd.getpwnam(value) or None
+#       to not change the worker process user.
+#
+#   group - Switch worker process to run as this group.
+#
+#       A valid group id (as an integer) or the name of a user that
+#       can be retrieved with a call to pwd.getgrnam(value) or None
+#       to change the worker processes group.
+#
+#   umask - A mask for file permissions written by Gunicorn. Note that
+#       this affects unix socket permissions.
+#
+#       A valid value for the os.umask(mode) call or a string
+#       compatible with int(value, 0) (0 means Python guesses
+#       the base, so values like "0", "0xFF", "0022" are valid
+#       for decimal, hex, and octal representations)
+#
+#   tmp_upload_dir - A directory to store temporary request data when
+#       requests are read. This will most likely be disappearing soon.
+#
+#       A path to a directory where the process owner can write. Or
+#       None to signal that Python should choose one on its own.
+#
+
+daemon = get_optional_env_variable("GUNICORN_DAEMON") or False
+raw_env = get_optional_env_variable("GUNICORN_RAW_ENV") or []
+pidfile = get_optional_env_variable("GUNICORN_PIDFILE") or None
+umask = get_optional_env_variable("GUNICORN_UMASK") or 0
+user = get_optional_env_variable("GUNICORN_USER") or None
+group = get_optional_env_variable("GUNICORN_GROUP") or None
+tmp_upload_dir = get_optional_env_variable("GUNICORN_TMP_UPLOAD_DIR") or None
+
+#
+#   Logging
+#
+#   logfile - The path to a log file to write to.
+#
+#       A path string. "-" means log to stdout.
+#
+#   loglevel - The granularity of log output
+#
+#       A string of "debug", "info", "warning", "error", "critical"
+#
+
+errorlog = get_optional_env_variable("GUNICORN_ERRORLOG") or "-"
+loglevel = get_optional_env_variable("GUNICORN_LOGLEVEL") or "info"
+accesslog = get_optional_env_variable("GUNICORN_ACCESSLOG") or "-"
+access_log_format = (
+    get_optional_env_variable("GUNICORN_ACCESS_LOG_FORMAT")
+    or '%(h)s %(l)s %(u)s %(t)s "%(r)s" %(s)s %(b)s "%(f)s" "%(a)s"'
+)
+
+#
+# Process naming
+#
+#   proc_name - A base to use with setproctitle to change the way
+#       that Gunicorn processes are reported in the system process
+#       table. This affects things like 'ps' and 'top'. If you're
+#       going to be running more than one instance of Gunicorn you'll
+#       probably want to set a name to tell them apart. This requires
+#       that you install the setproctitle module.
+#
+#       A string or None to choose a default of something like 'gunicorn'.
+#
+
+proc_name = get_optional_env_variable("GUNICORN_PROC_NAME") or None
+
+#
+# Server hooks
+#
+#   post_fork - Called just after a worker has been forked.
+#
+#       A callable that takes a server and worker instance
+#       as arguments.
+#
+#   pre_fork - Called just prior to forking the worker subprocess.
+#
+#       A callable that accepts the same arguments as after_fork
+#
+#   pre_exec - Called just prior to forking off a secondary
+#       master process during things like config reloading.
+#
+#       A callable that takes a server instance as the sole argument.
+#
+
+
+def post_fork(server, worker):
+    server.log.info("Worker spawned (pid: %s)", worker.pid)
+
+
+def pre_fork(server, worker):
+    pass
+
+
+def pre_exec(server):
+    server.log.info("Forked child, re-executing.")
+
+
+def when_ready(server):
+    server.log.info("Server is ready. Spawning workers")
+
+
+def worker_int(worker):
+    worker.log.info("worker received INT or QUIT signal")
+
+    # get traceback info
+    import threading
+    import sys
+    import traceback
+
+    id2name = {th.ident: th.name for th in threading.enumerate()}
+    code = []
+    for threadId, stack in list(sys._current_frames().items()):
+        code.append("\n# Thread: %s(%d)" % (id2name.get(threadId, ""), threadId))
+        for filename, lineno, name, line in traceback.extract_stack(stack):
+            code.append('File: "%s", line %d, in %s' % (filename, lineno, name))
+            if line:
+                code.append("  %s" % (line.strip()))
+    worker.log.debug("\n".join(code))
+
+
+def worker_abort(worker):
+    worker.log.info("worker received SIGABRT signal")