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Support for starting, monitoring, and restarting child process.
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The parameters of a process to be restarted.
@ivar args: command-line arguments (including name of command as first one)
@type args: C{list}
@ivar uid: user-id to run process as, or None (which means inherit uid)
@type uid: C{int}
@ivar gid: group-id to run process as, or None (which means inherit gid)
@type gid: C{int}
@ivar env: environment for process
@type env: C{dict}
@ivar cwd: initial working directory for process or None
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@type cwd: C{str}
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Convert process to tuple.
Convert process to tuple that looks like the legacy structure
of processes, for potential users who inspected processes
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This was only an accidental feature, and will be removed. If
you need to remember what processes were added to a process monitor,
keep track of that when they are added. The process list
inside the process monitor is no longer a public API.
This allows changing the internal structure of the process list,
when warranted by bug fixes or additional features.
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ProcessMonitor runs processes, monitors their progress, and restarts
them when they die.
The ProcessMonitor will not attempt to restart a process that appears to
die instantly -- with each "instant" death (less than 1 second, by
default), it will delay approximately twice as long before restarting
it. A successful run will reset the counter.
The primary interface is L{addProcess} and L{removeProcess}. When the
service is running (that is, when the application it is attached to is
running), adding a process automatically starts it.
Each process has a name. This name string must uniquely identify the
process. In particular, attempting to add two processes with the same
name will result in a C{KeyError}.
@type threshold: C{float}
@ivar threshold: How long a process has to live before the death is
considered instant, in seconds. The default value is 1 second.
@type killTime: C{float}
@ivar killTime: How long a process being killed has to get its affairs
in order before it gets killed with an unmaskable signal. The
default value is 5 seconds.
@type minRestartDelay: C{float}
@ivar minRestartDelay: The minimum time (in seconds) to wait before
attempting to restart a process. Default 1s.
@type maxRestartDelay: C{float}
@ivar maxRestartDelay: The maximum time (in seconds) to wait before
attempting to restart a process. Default 3600s (1h).
@type _reactor: L{IReactorProcess} provider
@ivar _reactor: A provider of L{IReactorProcess} and L{IReactorTime}
which will be used to spawn processes and register delayed calls.
@type log: L{Logger}
@ivar log: The logger used to propagate log messages from spawned
processes.
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Add a new monitored process and start it immediately if the
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C{ProcessMonitor.addProcess("name", ['/bin/sh', '-c', shell_script])}
@param name: A name for this process. This value must be
unique across all processes added to this monitor.
@type name: C{str}
@param args: The argv sequence for the process to launch.
@param uid: The user ID to use to run the process. If L{None},
the current UID is used.
@type uid: C{int}
@param gid: The group ID to use to run the process. If L{None},
the current GID is used.
@type uid: C{int}
@param env: The environment to give to the launched process. See
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@type env: C{dict}
@param cwd: The initial working directory of the launched process.
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working directory.
@type env: C{dict}
@raise KeyError: If a process with the given name already exists.
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Start all monitored processes.
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Stop all monitored processes and cancel all scheduled process restarts.
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Called when a monitored processes exits. If
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process will be restarted.
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L{ProcessMonitor.threshold} seconds, the restart will be delayed and
each time the process dies before the configured threshold, the restart
delay will be doubled - up to a maximum delay of maxRestartDelay sec.
@type name: C{str}
@param name: A string that uniquely identifies the process
which exited.
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Restart all processes. This is useful for third party management
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