cnservice

type Config struct {
	// UUID cn store uuid
	UUID string `toml:"uuid"`
	// Role cn node role, [AP|TP]
	Role string `toml:"role"`

	// ListenAddress listening address for receiving external requests
	ListenAddress string `toml:"listen-address"`
	// ServiceAddress service address for communication, if this address is not set, use
	// ListenAddress as the communication address.
	ServiceAddress string `toml:"service-address"`
	// SQLAddress service address for receiving external sql client
	SQLAddress string `toml:"sql-address"`

	// PortBase is the base port for the service. We reserve reservedPorts for
	// the service to start internal server inside it.
	//
	// TODO(volgariver6): The value of this field is also used to determine the version
	// of MO. If it is not set, we use the old listen-address/service-address fields, and
	// if it is set, we use the new policy to distribute the ports to all services.
	PortBase int `toml:"port-base"`
	// ServiceHost is the host name/IP for the service address of RPC request. There is
	// no port value in it.
	ServiceHost string `toml:"service-host"`

	Engine struct {
		Type     EngineType           `toml:"type"`
		Logstore options.LogstoreType `toml:"logstore"`
	}

	// parameters for cn-server related buffer.
	ReadBufferSize  int
	WriteBufferSize int

	// Pipeline configuration
	Pipeline struct {
		// HostSize is the memory limit
		HostSize int64 `toml:"host-size"`
		// GuestSize is the memory limit for one query
		GuestSize int64 `toml:"guest-size"`
		// BatchRows is the batch rows limit for one batch
		BatchRows int64 `toml:"batch-rows"`
		// BatchSize is the memory limit for one batch
		BatchSize int64 `toml:"batch-size"`
	}

	// Frontend parameters for the frontend
	Frontend config.FrontendParameters `toml:"frontend"`

	// HAKeeper configuration
	HAKeeper struct {
		// HeatbeatInterval heartbeat interval to send message to hakeeper. Default is 1s
		HeatbeatInterval toml.Duration `toml:"hakeeper-heartbeat-interval"`
		// HeatbeatTimeout heartbeat request timeout. Default is 500ms
		HeatbeatTimeout toml.Duration `toml:"hakeeper-heartbeat-timeout"`
		// DiscoveryTimeout discovery HAKeeper service timeout. Default is 30s
		DiscoveryTimeout toml.Duration `toml:"hakeeper-discovery-timeout"`
		// ClientConfig hakeeper client configuration
		ClientConfig logservice.HAKeeperClientConfig
	}

	// TaskRunner configuration
	TaskRunner struct {
		QueryLimit        int           `toml:"task-query-limit"`
		Parallelism       int           `toml:"task-parallelism"`
		MaxWaitTasks      int           `toml:"task-max-wait-tasks"`
		FetchInterval     toml.Duration `toml:"task-fetch-interval"`
		FetchTimeout      toml.Duration `toml:"task-fetch-timeout"`
		RetryInterval     toml.Duration `toml:"task-retry-interval"`
		HeartbeatInterval toml.Duration `toml:"task-heartbeat-interval"`
	}

	// RPC rpc config used to build txn sender
	RPC rpc.Config `toml:"rpc"`

	// Cluster configuration
	Cluster struct {
		// RefreshInterval refresh cluster info from hakeeper interval
		RefreshInterval toml.Duration `toml:"refresh-interval"`
	}

	// LockService lockservice
	LockService lockservice.Config `toml:"lockservice"`

	// Txn txn config
	Txn struct {
		// Isolation txn isolation. SI or RC
		// when Isolation is not set. we will set SI when Mode is optimistic, RC when Mode is pessimistic
		Isolation string `toml:"isolation"`
		// Mode txn mode. optimistic or pessimistic, default is pessimistic
		Mode string `toml:"mode"`
		// EnableSacrificingFreshness In Push Mode, the transaction is not guaranteed
		// to see the latest commit data, and the latest Logtail commit timestamp received
		// by the current CN + 1 is used as the start time of the transaction. But it will
		// ensure that the transactions of the same database connection can see the writes
		// of the previous committed transactions.
		// -1: disable
		//	0: auto config based on txn mode
		//  1: enable
		EnableSacrificingFreshness int `toml:"enable-sacrificing-freshness"`
		// EnableCNBasedConsistency ensure that all the transactions on a CN can read
		// the writes of the previous committed transaction
		// -1: disable
		//	0: auto config based on txn mode
		//  1: enable
		EnableCNBasedConsistency int `toml:"enable-cn-based-consistency"`
		// EnableRefreshExpressionIn RC mode, in the event of a conflict, the later transaction
		// needs to see the latest data after the previous transaction commits. At this time we
		// need to re-read the data, re-read the latest data, and re-compute the expression. This
		// feature was turned off in 0.8 and is not supported for now. The replacement solution is
		// to return a retry error and let the whole computation re-execute.
		// -1: disable
		//	0: auto config based on txn mode
		//  1: enable
		EnableRefreshExpression int `toml:"enable-refresh-expression"`
		// EnableLeakCheck enable txn leak check
		// -1: disable
		//	0: auto config based on txn mode
		//  1: enable
		EnableLeakCheck int `toml:"enable-leak-check"`
		// MaxActiveAges a txn max active duration
		MaxActiveAges toml.Duration `toml:"max-active-ages"`
		// EnableCheckRCInvalidError this config is used to check and find RC bugs in pessimistic mode.
		// Will remove it later version.
		EnableCheckRCInvalidError bool `toml:"enable-check-rc-invalid-error"`
		// Limit flow control of transaction creation, maximum number of transactions per second. Default
		// is unlimited.
		Limit int `toml:"limit-per-second"`
		// MaxActive is the count of max active txn in current cn.  If reached max value, the txn
		// is added to a FIFO queue. Default is unlimited.
		MaxActive int `toml:"max-active"`
	} `toml:"txn"`

	// Ctl ctl service config. CtlService is used to handle ctl request. See mo_ctl for detail.
	Ctl ctlservice.Config `toml:"ctl"`

	// AutoIncrement auto increment config
	AutoIncrement incrservice.Config `toml:"auto-increment"`

	// QueryServiceConfig is the config for query service.
	QueryServiceConfig queryservice.Config `toml:"query-service"`

	// PrimaryKeyCheck
	PrimaryKeyCheck bool `toml:"primary-key-check"`

	// MaxPreparedStmtCount
	MaxPreparedStmtCount int `toml:"max_prepared_stmt_count"`

	// InitWorkState is the initial work state for CN. Valid values are:
	// "working", "draining" and "drained".
	InitWorkState string `toml:"init-work-state"`
}

type EngineType string

type Option func(*service)

type PortSlot int

type Service interface {
	Start() error
	Close() error
	// ID returns UUID of the service.
	ID() string
	GetTaskRunner() taskservice.TaskRunner
	GetTaskService() (taskservice.TaskService, bool)
	WaitSystemInitCompleted(ctx context.Context) error
}