config

type Assignment struct {
	Version   int
	UpdatedAt int64               // timestamp when created
	UpdatedBy string              // leader instance
	Map       map[string][]string // map instance to a list of task_name
}

type ClickHouseConfig struct {
	Cluster   string
	DB        string
	Hosts     [][]string
	Port      int
	Username  string
	Password  string
	DsnParams string

	// Whether enable TLS encryption with clickhouse-server
	Secure bool
	// Whether skip verify clickhouse-server cert
	InsecureSkipVerify bool

	RetryTimes   int //<=0 means retry infinitely
	MaxOpenConns int
}

type Config struct {
	Kafka      KafkaConfig
	Clickhouse ClickHouseConfig
	Task       *TaskConfig
	Tasks      []*TaskConfig
	Assignment Assignment
	LogLevel   string
}

type KafkaConfig struct {
	Brokers  string
	Version  string
	Security map[string]string
	TLS      struct {
		Enable         bool
		CaCertFiles    string // Required. It's the CA cert.pem with which Kafka brokers certs be signed.
		ClientCertFile string // Required for client authentication. It's client cert.pem.
		ClientKeyFile  string // Required if and only if ClientCertFile is present. It's client key.pem.

		TrustStoreLocation string //JKS format of CA certificate, used to extract CA cert.pem.
		TrustStorePassword string
		KeystoreLocation   string //JKS format of client certificate and key, used to extrace client cert.pem and key.pem.
		KeystorePassword   string
		EndpIdentAlgo      string
	}
	//simplified sarama.Config.Net.SASL to only support SASL/PLAIN and SASL/GSSAPI(Kerberos)
	Sasl struct {
		// Whether or not to use SASL authentication when connecting to the broker
		// (defaults to false).
		Enable bool
		// Mechanism is the name of the enabled SASL mechanism.
		// Possible values: PLAIN, SCRAM-SHA-256, SCRAM-SHA-512, GSSAPI (defaults to PLAIN)
		Mechanism string
		// Username is the authentication identity (authcid) to present for
		// SASL/PLAIN or SASL/SCRAM authentication
		Username string
		// Password for SASL/PLAIN or SASL/SCRAM authentication
		Password string
		GSSAPI   struct {
			AuthType           int //1. KRB5_USER_AUTH, 2. KRB5_KEYTAB_AUTH
			KeyTabPath         string
			KerberosConfigPath string
			ServiceName        string
			Username           string
			Password           string
			Realm              string
			DisablePAFXFAST    bool
		}
	}
}

type TaskConfig struct {
	Name string

	KafkaClient   string
	Topic         string
	ConsumerGroup string

	// Earliest set to true to consume the message from oldest position
	Earliest bool
	Parser   string
	// the csv cloum title if Parser is csv
	CsvFormat []string
	Delimiter string

	TableName string

	// AutoSchema will auto fetch the schema from clickhouse
	AutoSchema     bool
	ExcludeColumns []string
	Dims           []struct {
		Name       string
		Type       string
		SourceName string
	} `json:"dims"`
	// DynamicSchema will add columns present in message to clickhouse. Requires AutoSchema be true.
	DynamicSchema struct {
		Enable  bool
		MaxDims int // the upper limit of dynamic columns number, <=0 means math.MaxInt16. protecting dirty data attack
	}

	// ShardingKey is the column name to which sharding against
	ShardingKey string `json:"shardingKey,omitempty"`
	// ShardingPolicy is `stripe,<interval>`(requires ShardingKey be numerical) or `hash`(requires ShardingKey be string)
	ShardingPolicy string `json:"shardingPolicy,omitempty"`

	FlushInterval int    `json:"flushInterval,omitempty"`
	BufferSize    int    `json:"bufferSize,omitempty"`
	TimeZone      string `json:"timezone"`
}