80 lines
2.8 KiB
Go
80 lines
2.8 KiB
Go
package server
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import (
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"os"
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)
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// Defines the basic interface that all environments need to implement so that
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// a server can be properly controlled.
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type Environment interface {
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// Returns the name of the environment.
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Type() string
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// Determines if the environment is currently active and running a server process
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// for this specific server instance.
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IsRunning() (bool, error)
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// Performs an update of server resource limits without actually stopping the server
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// process. This only executes if the environment supports it, otherwise it is
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// a no-op.
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InSituUpdate() error
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// Runs before the environment is started. If an error is returned starting will
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// not occur, otherwise proceeds as normal.
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OnBeforeStart() error
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// Starts a server instance. If the server instance is not in a state where it
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// can be started an error should be returned.
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Start() error
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// Stops a server instance. If the server is already stopped an error should
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// not be returned.
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Stop() error
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// Determines if the server instance exists. For example, in a docker environment
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// this should confirm that the container is created and in a bootable state. In
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// a basic CLI environment this can probably just return true right away.
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Exists() (bool, error)
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// Terminates a running server instance using the provided signal. If the server
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// is not running no error should be returned.
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Terminate(signal os.Signal) error
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// Destroys the environment removing any containers that were created (in Docker
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// environments at least).
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Destroy() error
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// Returns the exit state of the process. The first result is the exit code, the second
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// determines if the process was killed by the system OOM killer.
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ExitState() (uint32, bool, error)
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// Creates the necessary environment for running the server process. For example,
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// in the Docker environment create will create a new container instance for the
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// server.
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Create() error
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// Attaches to the server console environment and allows piping the output to a
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// websocket or other internal tool to monitor output. Also allows you to later
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// send data into the environment's stdin.
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Attach() error
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// Follows the output from the server console and will begin piping the output to
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// the server's emitter.
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FollowConsoleOutput() error
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// Sends the provided command to the running server instance.
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SendCommand(string) error
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// Reads the log file for the process from the end backwards until the provided
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// number of bytes is met.
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Readlog(int64) ([]string, error)
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// Polls the given environment for resource usage of the server when the process
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// is running.
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EnableResourcePolling() error
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// Disables the polling operation for resource usage and sets the required values
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// to 0 in the server resource usage struct.
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DisableResourcePolling() error
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}
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