upgrader

type Config struct {
	Required bool              // 防止upgrade在主进程失败时回退到运行
	Program  func(state State) // 执行被控程序的主程序
	//Program's zero-downtime socket listening address (set this or Addresses)
	Address string
	//Program's zero-downtime socket listening addresses (set this or Address)
	Addresses []string
	//RestartSignal will manually trigger a graceful restart. Defaults to SIGUSR2.
	RestartSignal os.Signal
	//TerminateTimeout controls how long upgrader should
	//wait for the program to terminate itself. After this
	//timeout, upgrader will issue a SIGKILL.
	TerminateTimeout time.Duration
	//MinFetchInterval defines the smallest duration between Fetch()s.
	//This helps to prevent unwieldy fetch.Interfaces from hogging
	//too many resources. Defaults to 1 second.
	MinFetchInterval time.Duration
	//PreUpgrade runs after a binary has been retrieved, user defined checks
	//can be run here and returning an error will cancel the upgrade.
	PreUpgrade func(tempBinaryPath string) error
	//Debug enables all [upgrader] logs.
	Debug bool
	//NoWarn disables warning [upgrader] logs.
	NoWarn bool
	//NoRestart disables all restarts, this option essentially converts
	//the RestartSignal into a "ShutdownSignal".
	NoRestart bool
	//NoRestartAfterFetch disables automatic restarts after each upgrade.
	//Though manual restarts using the RestartSignal can still be performed.
	NoRestartAfterFetch bool
	//Fetcher will be used to fetch binaries.
	Fetcher fetcher.Fetcher
}

type Conn struct {
	net.Conn
	// contains filtered or unexported fields
}

type Listener struct {
	net.Listener
	// contains filtered or unexported fields
}

type State struct {
	//whether upgrader is running enabled. When enabled,
	//this program will be running in a child process and
	//upgrader will perform rolling upgrades.
	Enabled bool
	//ID is a SHA-1 hash of the current running binary
	ID string
	//StartedAt records the start time of the program
	StartedAt time.Time
	//Listener is the first net.Listener in Listeners
	Listener net.Listener
	//Listeners are the set of acquired sockets by the master
	//process. These are all passed into this program in the
	//same order they are specified in Config.Addresses.
	Listeners []net.Listener
	//Program's first listening address
	Address string
	//Program's listening addresses
	Addresses []string
	//GracefulShutdown will be filled when its time to perform
	//a graceful shutdown.
	GracefulShutdown chan bool
	//Path of the binary currently being executed
	BinPath string
}