export

package
v1.1.0-beta.0...-33f0727 Latest Latest
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 Go to latest Published: Dec 23, 2024 License: Apache-2.0 Imports: 65 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// UnspecifiedSize means the filesize/statement-size is unspecified
	UnspecifiedSize = 0
	// DefaultStatementSize is the default statement size
	DefaultStatementSize = 1000000
	// TiDBMemQuotaQueryName is the session variable TiDBMemQuotaQuery's name in TiDB
	TiDBMemQuotaQueryName = "tidb_mem_quota_query"
	// DefaultTableFilter is the default exclude table filter. It will exclude all system databases
	DefaultTableFilter = "!/^(mysql|sys|INFORMATION_SCHEMA|PERFORMANCE_SCHEMA|METRICS_SCHEMA|INSPECTION_SCHEMA)$/.*"

	// LooseCollationCompatible is used in DM, represents a collation setting for best compatibility.
	LooseCollationCompatible = "loose"
	// StrictCollationCompatible is used in DM, represents a collation setting for correctness.
	StrictCollationCompatible = "strict"
)
View Source 
const (
	// ConsistencyTypeAuto will use flush for MySQL/MariaDB and snapshot for TiDB.
	ConsistencyTypeAuto = "auto"
	// ConsistencyTypeFlush will use FLUSH TABLES WITH READ LOCK to temporarily interrupt the DML and DDL operations of the replica database,
	// to ensure the global consistency of the backup connection.
	ConsistencyTypeFlush = "flush"
	// ConsistencyTypeLock will add read locks on all tables to be exported.
	ConsistencyTypeLock = "lock"
	// ConsistencyTypeSnapshot gets a consistent snapshot of the specified timestamp and exports it.
	ConsistencyTypeSnapshot = "snapshot"
	// ConsistencyTypeNone doesn't guarantee for consistency.
	ConsistencyTypeNone = "none"
)
View Source 
const (
	// TableTypeBaseStr represents the basic table string
	TableTypeBaseStr = "BASE TABLE"
	// TableTypeViewStr represents the view table string
	TableTypeViewStr = "VIEW"
	// TableTypeSequenceStr represents the view table string
	TableTypeSequenceStr = "SEQUENCE"
)
View Source 
const (
	// FileFormatSQLTextString indicates the string/suffix of sql type file
	FileFormatSQLTextString = "sql"
	// FileFormatCSVString indicates the string/suffix of csv type file
	FileFormatCSVString = "csv"
)
View Source 
const (

	// DefaultAnonymousOutputFileTemplateText is the default anonymous output file templateText for dumpling's table data file name
	DefaultAnonymousOutputFileTemplateText = "result.{{.Index}}"
)
View Source 
const (

	// ErrNoSuchTable is the error code no such table in MySQL/TiDB
	ErrNoSuchTable uint16 = 1146
)
View Source 
const (

	// FlagHelp represents the help flag
	FlagHelp = "help"
)

Variables

View Source 
var (

	// DefaultOutputFileTemplate is the default output file template for dumpling's table data file name
	DefaultOutputFileTemplate = template.Must(template.New("data").
		Option("missingkey=error").
		Funcs(template.FuncMap{
			"fn": func(input string) string {
				return filenameEscapeRegexp.ReplaceAllStringFunc(input, func(match string) string {
					return fmt.Sprintf("%%%02X%s", match[0], match[1:])
				})
			},
		}).
		Parse(defaultOutputFileTemplateBase))
)
View Source 
var DialectBinaryFormatMap = map[CSVDialect]BinaryFormat{
	CSVDialectDefault:   BinaryFormatUTF8,
	CSVDialectSnowflake: BinaryFormatHEX,
	CSVDialectRedshift:  BinaryFormatHEX,
	CSVDialectBigQuery:  BinaryFormatBase64,
}

DialectBinaryFormatMap is the map of dialect and binary format

View Source 
var ServerInfoUnknown = version.ServerInfo{
	ServerType:    version.ServerTypeUnknown,
	ServerVersion: nil,
}

ServerInfoUnknown is the unknown database type to dumpling

Functions

func AddCounter 

func AddCounter(counterVec *prometheus.CounterVec, v float64)

AddCounter adds a counter.

func AddGauge 

func AddGauge(gaugeVec *prometheus.GaugeVec, v float64)

AddGauge adds a gauge

func CheckTiDBEnableTableLock 

func CheckTiDBEnableTableLock(db *sql.Conn) (bool, error)

CheckTiDBEnableTableLock use sql variable to check whether current TiDB has TiKV

func CheckTiDBWithTiKV 

func CheckTiDBWithTiKV(db *sql.DB) (bool, error)

CheckTiDBWithTiKV use sql to check whether current TiDB has TiKV

func DatabaseTablesToMap 

func DatabaseTablesToMap(d DatabaseTables) map[string]map[string]struct{}

DatabaseTablesToMap transfers DatabaseTables to Map

func DecGauge 

func DecGauge(gaugeVec *prometheus.GaugeVec)

DecGauge decs a gauge

func FlushTableWithReadLock 

func FlushTableWithReadLock(ctx context.Context, db *sql.Conn) error

FlushTableWithReadLock flush tables with read lock

func GetCharsetAndDefaultCollation 

func GetCharsetAndDefaultCollation(ctx context.Context, db *sql.Conn) (map[string]string, error)

GetCharsetAndDefaultCollation gets charset and default collation map.

func GetColumnTypes 

func GetColumnTypes(tctx *tcontext.Context, db *BaseConn, fields, database, table string) ([]*sql.ColumnType, error)

GetColumnTypes gets *sql.ColumnTypes from a specified table

func GetDBInfo 

func GetDBInfo(db *sql.Conn, tables map[string]map[string]struct{}) ([]*model.DBInfo, error)

GetDBInfo get model.DBInfos from database sql interface. We need table_id to check whether a region belongs to this table

func GetPartitionNames 

func GetPartitionNames(tctx *tcontext.Context, db *BaseConn, schema, table string) (partitions []string, err error)

GetPartitionNames get partition names from a specified table

func GetPartitionTableIDs 

func GetPartitionTableIDs(db *sql.Conn, tables map[string]map[string]struct{}) (map[string]map[string]map[string]int64, error)

GetPartitionTableIDs get partition tableIDs through histograms. SHOW STATS_HISTOGRAMS has db_name,table_name,partition_name but doesn't have partition id mysql.stats_histograms has partition_id but doesn't have db_name,table_name,partition_name So we combine the results from these two sqls to get partition ids for each table If UPDATE_TIME,DISTINCT_COUNT are equal, we assume these two records can represent one line. If histograms are not accurate or (UPDATE_TIME,DISTINCT_COUNT) has duplicate data, it's still fine. Because the possibility is low and the effect is that we will select more than one regions in one time, this will not affect the correctness of the dumping data and will not affect the memory usage much. This method is tricky, but no better way is found. Because TiDB v3.0.0's information_schema.partition table doesn't have partition name or partition id info return (dbName -> tbName -> partitionName -> partitionID, error)

func GetPdAddrs 

func GetPdAddrs(tctx *tcontext.Context, db *sql.DB) ([]string, error)

GetPdAddrs gets PD address from TiDB

func GetPrimaryKeyAndColumnTypes 

func GetPrimaryKeyAndColumnTypes(tctx *tcontext.Context, conn *BaseConn, meta TableMeta) ([]string, []string, error)

GetPrimaryKeyAndColumnTypes gets all primary columns and their types in ordinal order

func GetPrimaryKeyColumns 

func GetPrimaryKeyColumns(tctx *tcontext.Context, db *BaseConn, database, table string) ([]string, error)

GetPrimaryKeyColumns gets all primary columns in ordinal order

func GetRegionInfos 

func GetRegionInfos(db *sql.Conn) (*pd.RegionsInfo, error)

GetRegionInfos get region info including regionID, start key, end key from database sql interface. start key, end key includes information to help split table

func GetSpecifiedColumnValueAndClose 

func GetSpecifiedColumnValueAndClose(rows *sql.Rows, columnName string) ([]string, error)

GetSpecifiedColumnValueAndClose get columns' values whose name is equal to columnName and close the given rows

func GetSpecifiedColumnValuesAndClose 

func GetSpecifiedColumnValuesAndClose(rows *sql.Rows, columnName ...string) ([][]string, error)

GetSpecifiedColumnValuesAndClose get columns' values whose name is equal to columnName

func GetSuitableRows 

func GetSuitableRows(avgRowLength uint64) uint64

GetSuitableRows gets suitable rows for each table

func GetTiDBDDLIDs 

func GetTiDBDDLIDs(tctx *tcontext.Context, db *sql.DB) ([]string, error)

GetTiDBDDLIDs gets DDL IDs from TiDB

func IncCounter 

func IncCounter(counterVec *prometheus.CounterVec)

IncCounter incs a counter.

func IncGauge 

func IncGauge(gaugeVec *prometheus.GaugeVec)

IncGauge incs a gauge

func ListAllPlacementPolicyNames 

func ListAllPlacementPolicyNames(tctx *tcontext.Context, db *BaseConn) ([]string, error)

ListAllPlacementPolicyNames returns all placement policy names.

func LockTables 

func LockTables(ctx context.Context, db *sql.Conn, database, table string) error

LockTables locks table with read lock

func ObserveHistogram 

func ObserveHistogram(histogramVec *prometheus.HistogramVec, v float64)

ObserveHistogram observes a histogram

func ParseCompressType 

func ParseCompressType(compressType string) (storage.CompressType, error)

ParseCompressType parses compressType string to storage.CompressType

func ParseFileSize 

func ParseFileSize(fileSizeStr string) (uint64, error)

ParseFileSize parses file size from tables-list and filter arguments

func ParseOutputFileTemplate 

func ParseOutputFileTemplate(text string) (*template.Template, error)

ParseOutputFileTemplate parses template from the specified text

func ParseTableFilter 

func ParseTableFilter(tablesList, filters []string) (filter.Filter, error)

ParseTableFilter parses table filter from tables-list and filter arguments

func ReadCounter 

func ReadCounter(counterVec *prometheus.CounterVec) float64

ReadCounter reports the current value of the counter.

func ReadGauge 

func ReadGauge(gaugeVec *prometheus.GaugeVec) float64

ReadGauge reports the current value of the gauge.

func RestoreCharset 

func RestoreCharset(w io.StringWriter)

RestoreCharset builds the restore charset SQLs

func SelectTiDBRowID 

func SelectTiDBRowID(tctx *tcontext.Context, db *BaseConn, database, table string) (bool, error)

SelectTiDBRowID checks whether this table has _tidb_rowid column

func SelectVersion 

func SelectVersion(db *sql.DB) (string, error)

SelectVersion gets the version information from the database server

func SetCharset 

func SetCharset(w *strings.Builder, characterSet, collationConnection string)

SetCharset builds the set charset SQLs

func ShowCreateDatabase 

func ShowCreateDatabase(tctx *tcontext.Context, db *BaseConn, database string) (string, error)

ShowCreateDatabase constructs the create database SQL for a specified database returns (createDatabaseSQL, error)

func ShowCreatePlacementPolicy 

func ShowCreatePlacementPolicy(tctx *tcontext.Context, db *BaseConn, policy string) (string, error)

ShowCreatePlacementPolicy constructs the create policy SQL for a specified table returns (createPolicySQL, error)

func ShowCreateSequence 

func ShowCreateSequence(tctx *tcontext.Context, db *BaseConn, database, sequence string, conf *Config) (string, error)

ShowCreateSequence constructs the create sequence SQL for a specified sequence returns (createSequenceSQL, error)

func ShowCreateTable 

func ShowCreateTable(tctx *tcontext.Context, db *BaseConn, database, table string) (string, error)

ShowCreateTable constructs the create table SQL for a specified table returns (createTableSQL, error)

func ShowCreateView 

func ShowCreateView(tctx *tcontext.Context, db *BaseConn, database, view string) (createFakeTableSQL string, createRealViewSQL string, err error)

ShowCreateView constructs the create view SQL for a specified view returns (createFakeTableSQL, createViewSQL, error)

func ShowDatabases 

func ShowDatabases(db *sql.Conn) ([]string, error)

ShowDatabases shows the databases of a database server.

func ShowMasterStatus 

func ShowMasterStatus(db *sql.Conn, serverInfo version.ServerInfo) ([]string, error)

ShowMasterStatus get SHOW MASTER STATUS result from database

func ShowTables 

func ShowTables(db *sql.Conn) ([]string, error)

ShowTables shows the tables of a database, the caller should use the correct database.

func SubGauge 

func SubGauge(gaugeVec *prometheus.GaugeVec, v float64)

SubGauge subs a gauge

func UnlockTables 

func UnlockTables(ctx context.Context, db *sql.Conn) error

UnlockTables unlocks all tables' lock

func WriteInsert 

func WriteInsert(
	pCtx *tcontext.Context,
	cfg *Config,
	meta TableMeta,
	tblIR TableDataIR,
	w storage.ExternalFileWriter,
	metrics *metrics,
) (n uint64, err error)

WriteInsert writes TableDataIR to a storage.ExternalFileWriter in sql type

func WriteInsertInCsv 

func WriteInsertInCsv(
	pCtx *tcontext.Context,
	cfg *Config,
	meta TableMeta,
	tblIR TableDataIR,
	w storage.ExternalFileWriter,
	metrics *metrics,
) (n uint64, err error)

WriteInsertInCsv writes TableDataIR to a storage.ExternalFileWriter in csv type

func WriteMeta 

func WriteMeta(tctx *tcontext.Context, meta MetaIR, w storage.ExternalFileWriter) error

WriteMeta writes MetaIR to a storage.ExternalFileWriter

Types

type BaseConn 

type BaseConn struct {
	DBConn *sql.Conn
	// contains filtered or unexported fields
}

BaseConn wraps connection instance.

func (*BaseConn) ExecSQL 

func (conn *BaseConn) ExecSQL(tctx *tcontext.Context, canRetryFunc func(sql.Result, error) error, query string, args ...any) error

ExecSQL defines exec statement, and connect to real DB.

func (*BaseConn) QuerySQL 

func (conn *BaseConn) QuerySQL(tctx *tcontext.Context, handleOneRow func(*sql.Rows) error, reset func(), query string, args ...any) error

QuerySQL defines query statement, and connect to real DB.

func (*BaseConn) QuerySQLWithColumns 

func (conn *BaseConn) QuerySQLWithColumns(tctx *tcontext.Context, columns []string, query string, args ...any) ([][]string, error)

QuerySQLWithColumns defines query statement, and connect to real DB and get results for special column names

type BinaryFormat 

type BinaryFormat int

BinaryFormat is the format of binary data Three standard formats are supported: UTF8, HEX and Base64 now. 

const (
	// BinaryFormatUTF8 is the default format, format binary data as UTF8 string
	BinaryFormatUTF8 BinaryFormat = iota
	// BinaryFormatHEX format binary data as HEX string, e.g. 12ABCD
	BinaryFormatHEX
	// BinaryFormatBase64 format binary data as Base64 string, e.g. 123qwer==
	BinaryFormatBase64
)

type CSVDialect 

type CSVDialect int

CSVDialect is the dialect of the CSV output for compatible with different import target 

const (
	// CSVDialectDefault is the default dialect, which is MySQL/MariaDB/TiDB etc.
	CSVDialectDefault CSVDialect = iota
	// CSVDialectSnowflake is the dialect of Snowflake
	CSVDialectSnowflake
	// CSVDialectRedshift is the dialect of Redshift
	CSVDialectRedshift
	// CSVDialectBigQuery is the dialect of BigQuery
	CSVDialectBigQuery
)

func ParseOutputDialect 

func ParseOutputDialect(outputDialect string) (CSVDialect, error)

ParseOutputDialect parses output dialect string to Dialect

type Config 

type Config struct {
	storage.BackendOptions

	SpecifiedTables          bool
	AllowCleartextPasswords  bool
	SortByPk                 bool
	NoViews                  bool
	NoSequences              bool
	NoHeader                 bool
	NoSchemas                bool
	NoData                   bool
	CompleteInsert           bool
	TransactionalConsistency bool
	EscapeBackslash          bool
	DumpEmptyDatabase        bool
	PosAfterConnect          bool
	CompressType             storage.CompressType

	Host     string
	Port     int
	Threads  int
	User     string
	Password string `json:"-"`
	Security struct {
		TLS          *tls.Config `json:"-"`
		CAPath       string
		CertPath     string
		KeyPath      string
		SSLCABytes   []byte `json:"-"`
		SSLCertBytes []byte `json:"-"`
		SSLKeyBytes  []byte `json:"-"`
	}

	LogLevel          string
	LogFile           string
	LogFormat         string
	OutputDirPath     string
	StatusAddr        string
	Snapshot          string
	Consistency       string
	CsvNullValue      string
	SQL               string
	CsvSeparator      string
	CsvDelimiter      string
	CsvLineTerminator string
	Databases         []string

	TableFilter         filter.Filter `json:"-"`
	Where               string
	FileType            string
	ServerInfo          version.ServerInfo
	Logger              *zap.Logger        `json:"-"`
	OutputFileTemplate  *template.Template `json:"-"`
	Rows                uint64
	ReadTimeout         time.Duration
	TiDBMemQuotaQuery   uint64
	FileSize            uint64
	StatementSize       uint64
	SessionParams       map[string]any
	Tables              DatabaseTables
	CollationCompatible string
	CsvOutputDialect    CSVDialect

	Labels        prometheus.Labels       `json:"-"`
	PromFactory   promutil.Factory        `json:"-"`
	PromRegistry  promutil.Registry       `json:"-"`
	ExtStorage    storage.ExternalStorage `json:"-"`
	MinTLSVersion uint16                  `json:"-"`

	IOTotalBytes *atomic.Uint64
	Net          string
}

Config is the dump config for dumpling

func DefaultConfig 

func DefaultConfig() *Config

DefaultConfig returns the default export Config for dumpling

func (*Config) DefineFlags 

func (*Config) DefineFlags(flags *pflag.FlagSet)

DefineFlags defines flags of dumpling's configuration

func (*Config) GetDriverConfig 

func (conf *Config) GetDriverConfig(db string) *mysql.Config

GetDriverConfig returns the MySQL driver config from Config.

func (*Config) ParseFromFlags 

func (conf *Config) ParseFromFlags(flags *pflag.FlagSet) error

ParseFromFlags parses dumpling's export.Config from flags nolint: gocyclo

func (*Config) String 

func (conf *Config) String() string

String returns dumpling's config in json format

type ConsistencyController 

type ConsistencyController interface {
	Setup(*tcontext.Context) error
	TearDown(context.Context) error
	PingContext(context.Context) error
}

ConsistencyController is the interface that controls the consistency of exporting progress

func NewConsistencyController 

func NewConsistencyController(ctx context.Context, conf *Config, session *sql.DB) (ConsistencyController, error)

NewConsistencyController returns a new consistency controller

type ConsistencyFlushTableWithReadLock 

type ConsistencyFlushTableWithReadLock struct {
	// contains filtered or unexported fields
}

ConsistencyFlushTableWithReadLock uses FlushTableWithReadLock before the dump

func (*ConsistencyFlushTableWithReadLock) PingContext 

func (c *ConsistencyFlushTableWithReadLock) PingContext(ctx context.Context) error

PingContext implements ConsistencyController.PingContext

func (*ConsistencyFlushTableWithReadLock) Setup 

func (c *ConsistencyFlushTableWithReadLock) Setup(tctx *tcontext.Context) error

Setup implements ConsistencyController.Setup

func (*ConsistencyFlushTableWithReadLock) TearDown 

func (c *ConsistencyFlushTableWithReadLock) TearDown(ctx context.Context) error

TearDown implements ConsistencyController.TearDown

type ConsistencyLockDumpingTables 

type ConsistencyLockDumpingTables struct {
	// contains filtered or unexported fields
}

ConsistencyLockDumpingTables execute lock tables read on all tables before dump

func (*ConsistencyLockDumpingTables) PingContext 

func (c *ConsistencyLockDumpingTables) PingContext(ctx context.Context) error

PingContext implements ConsistencyController.PingContext

func (*ConsistencyLockDumpingTables) Setup 

func (c *ConsistencyLockDumpingTables) Setup(tctx *tcontext.Context) error

Setup implements ConsistencyController.Setup

func (*ConsistencyLockDumpingTables) TearDown 

func (c *ConsistencyLockDumpingTables) TearDown(ctx context.Context) error

TearDown implements ConsistencyController.TearDown

type ConsistencyNone 

type ConsistencyNone struct{}

ConsistencyNone dumps without adding locks, which cannot guarantee consistency

func (*ConsistencyNone) PingContext 

func (*ConsistencyNone) PingContext(_ context.Context) error

PingContext implements ConsistencyController.PingContext

func (*ConsistencyNone) Setup 

func (*ConsistencyNone) Setup(_ *tcontext.Context) error

Setup implements ConsistencyController.Setup

func (*ConsistencyNone) TearDown 

func (*ConsistencyNone) TearDown(_ context.Context) error

TearDown implements ConsistencyController.TearDown

type DatabaseTables 

type DatabaseTables map[databaseName][]*TableInfo

DatabaseTables is the type that represents tables in a database

func GetConfTables 

func GetConfTables(tablesList []string) (DatabaseTables, error)

GetConfTables parses tables from tables-list and filter arguments

func ListAllDatabasesTables 

func ListAllDatabasesTables(tctx *tcontext.Context, db *sql.Conn, databaseNames []string,
	listType listTableType, tableTypes ...TableType) (DatabaseTables, error)

ListAllDatabasesTables lists all the databases and tables from the database listTableByInfoSchema list tables by table information_schema in MySQL listTableByShowTableStatus has better performance than listTableByInfoSchema listTableByShowFullTables is used in mysql8 version [8.0.3,8.0.23), more details can be found in the comments of func matchMysqlBugversion

func NewDatabaseTables 

func NewDatabaseTables() DatabaseTables

NewDatabaseTables returns a new DatabaseTables

func (DatabaseTables) AppendTable 

func (d DatabaseTables) AppendTable(dbName string, table *TableInfo) DatabaseTables

AppendTable appends a TableInfo to DatabaseTables

func (DatabaseTables) AppendTables 

func (d DatabaseTables) AppendTables(dbName string, tableNames []string, avgRowLengths []uint64) DatabaseTables

AppendTables appends several basic tables to DatabaseTables

func (DatabaseTables) AppendViews 

func (d DatabaseTables) AppendViews(dbName string, viewNames ...string) DatabaseTables

AppendViews appends several views to DatabaseTables

func (DatabaseTables) Literal 

func (d DatabaseTables) Literal() string

Literal returns a user-friendly output for DatabaseTables

func (DatabaseTables) Merge 

func (d DatabaseTables) Merge(other DatabaseTables)

Merge merges another DatabaseTables

type DumpStatus 

type DumpStatus struct {
	CompletedTables   float64
	FinishedBytes     float64
	FinishedRows      float64
	EstimateTotalRows float64
	TotalTables       int64
	CurrentSpeedBPS   float64
	Progress          string
}

DumpStatus is the status of dumping.

type Dumper 

type Dumper struct {
	// contains filtered or unexported fields
}

Dumper is the dump progress structure

func NewDumper 

func NewDumper(ctx context.Context, conf *Config) (*Dumper, error)

NewDumper returns a new Dumper

func (*Dumper) Close 

func (d *Dumper) Close() error

Close closes a Dumper and stop dumping immediately

func (*Dumper) Dump 

func (d *Dumper) Dump() (dumpErr error)

Dump dumps table from database nolint: gocyclo

func (*Dumper) GetStatus 

func (d *Dumper) GetStatus() *DumpStatus

GetStatus returns the status of dumping by reading metrics.

func (*Dumper) L 

func (d *Dumper) L() log.Logger

L returns real logger

type FileFormat 

type FileFormat int32

FileFormat is the format that output to file. Currently we support SQL text and CSV file format. 

const (
	// FileFormatUnknown indicates the given file type is unknown
	FileFormatUnknown FileFormat = iota
	// FileFormatSQLText indicates the given file type is sql type
	FileFormatSQLText
	// FileFormatCSV indicates the given file type is csv type
	FileFormatCSV
)

func (FileFormat) Extension 

func (f FileFormat) Extension() string

Extension returns the extension for specific format. 

text -> "sql"
csv  -> "csv"

func (FileFormat) String 

func (f FileFormat) String() string

String implement Stringer.String method.

func (FileFormat) WriteInsert 

func (f FileFormat) WriteInsert(
	pCtx *tcontext.Context,
	cfg *Config,
	meta TableMeta,
	tblIR TableDataIR,
	w storage.ExternalFileWriter,
	metrics *metrics,
) (uint64, error)

WriteInsert writes TableDataIR to a storage.ExternalFileWriter in sql/csv type

type InterceptFileWriter 

type InterceptFileWriter struct {
	storage.ExternalFileWriter
	sync.Once
	SomethingIsWritten bool
	// contains filtered or unexported fields
}

InterceptFileWriter is an interceptor of os.File, tracking whether a StringWriter has written something.

func (*InterceptFileWriter) Close 

func (w *InterceptFileWriter) Close(ctx context.Context) error

Close closes the InterceptFileWriter

func (*InterceptFileWriter) Write 

func (w *InterceptFileWriter) Write(ctx context.Context, p []byte) (int, error)

Write implements storage.ExternalFileWriter.Write. It check whether writer has written something and init a file at first time

type LazyStringWriter 

type LazyStringWriter struct {
	sync.Once
	io.StringWriter
	// contains filtered or unexported fields
}

LazyStringWriter is an interceptor of io.StringWriter, will lazily create file the first time StringWriter need to write something.

func (*LazyStringWriter) WriteString 

func (l *LazyStringWriter) WriteString(str string) (int, error)

WriteString implements io.StringWriter. It check whether writer has written something and init a file at first time

type MetaIR 

type MetaIR interface {
	SpecialComments() StringIter
	TargetName() string
	MetaSQL() string
}

MetaIR is the interface that wraps database/table/view's metadata

type RowReceiver 

type RowReceiver interface {
	BindAddress([]any)
}

RowReceiver is an interface which represents sql types that support bind address for *sql.Rows

type RowReceiverArr 

type RowReceiverArr struct {
	// contains filtered or unexported fields
}

RowReceiverArr is the combined RowReceiver array

func MakeRowReceiver 

func MakeRowReceiver(colTypes []string) *RowReceiverArr

MakeRowReceiver constructs RowReceiverArr from column types

func (*RowReceiverArr) BindAddress 

func (r *RowReceiverArr) BindAddress(args []any)

BindAddress implements RowReceiver.BindAddress

func (*RowReceiverArr) WriteToBuffer 

func (r *RowReceiverArr) WriteToBuffer(bf *bytes.Buffer, escapeBackslash bool)

WriteToBuffer implements Stringer.WriteToBuffer

func (*RowReceiverArr) WriteToBufferInCsv 

func (r *RowReceiverArr) WriteToBufferInCsv(bf *bytes.Buffer, escapeBackslash bool, opt *csvOption)

WriteToBufferInCsv implements Stringer.WriteToBufferInCsv

type RowReceiverStringer 

type RowReceiverStringer interface {
	RowReceiver
	Stringer
}

RowReceiverStringer is a combined interface of RowReceiver and Stringer

func SQLTypeBytesMaker 

func SQLTypeBytesMaker() RowReceiverStringer

SQLTypeBytesMaker returns a SQLTypeBytes

func SQLTypeNumberMaker 

func SQLTypeNumberMaker() RowReceiverStringer

SQLTypeNumberMaker returns a SQLTypeNumber

func SQLTypeStringMaker 

func SQLTypeStringMaker() RowReceiverStringer

SQLTypeStringMaker returns a SQLTypeString

type SQLRowIter 

type SQLRowIter interface {
	Decode(RowReceiver) error
	Next()
	Error() error
	HasNext() bool
	// release SQLRowIter
	Close() error
}

SQLRowIter is the iterator on a collection of sql.Row.

type SQLTypeBytes 

type SQLTypeBytes struct {
	sql.RawBytes
}

SQLTypeBytes implements RowReceiverStringer which represents bytes type columns in database

func (*SQLTypeBytes) BindAddress 

func (s *SQLTypeBytes) BindAddress(arg []any)

BindAddress implements RowReceiver.BindAddress

func (*SQLTypeBytes) WriteToBuffer 

func (s *SQLTypeBytes) WriteToBuffer(bf *bytes.Buffer, _ bool)

WriteToBuffer implements Stringer.WriteToBuffer

func (*SQLTypeBytes) WriteToBufferInCsv 

func (s *SQLTypeBytes) WriteToBufferInCsv(bf *bytes.Buffer, escapeBackslash bool, opt *csvOption)

WriteToBufferInCsv implements Stringer.WriteToBufferInCsv

type SQLTypeNumber 

type SQLTypeNumber struct {
	SQLTypeString
}

SQLTypeNumber implements RowReceiverStringer which represents numeric type columns in database

func (SQLTypeNumber) WriteToBuffer 

func (s SQLTypeNumber) WriteToBuffer(bf *bytes.Buffer, _ bool)

WriteToBuffer implements Stringer.WriteToBuffer

func (SQLTypeNumber) WriteToBufferInCsv 

func (s SQLTypeNumber) WriteToBufferInCsv(bf *bytes.Buffer, _ bool, opt *csvOption)

WriteToBufferInCsv implements Stringer.WriteToBufferInCsv

type SQLTypeString 

type SQLTypeString struct {
	sql.RawBytes
}

SQLTypeString implements RowReceiverStringer which represents string type columns in database

func (*SQLTypeString) BindAddress 

func (s *SQLTypeString) BindAddress(arg []any)

BindAddress implements RowReceiver.BindAddress

func (*SQLTypeString) WriteToBuffer 

func (s *SQLTypeString) WriteToBuffer(bf *bytes.Buffer, escapeBackslash bool)

WriteToBuffer implements Stringer.WriteToBuffer

func (*SQLTypeString) WriteToBufferInCsv 

func (s *SQLTypeString) WriteToBufferInCsv(bf *bytes.Buffer, escapeBackslash bool, opt *csvOption)

WriteToBufferInCsv implements Stringer.WriteToBufferInCsv

type SpeedRecorder 

type SpeedRecorder struct {
	// contains filtered or unexported fields
}

SpeedRecorder record the finished bytes and calculate its speed.

func NewSpeedRecorder 

func NewSpeedRecorder() *SpeedRecorder

NewSpeedRecorder new a SpeedRecorder.

func (*SpeedRecorder) GetSpeed 

func (s *SpeedRecorder) GetSpeed(finished float64) float64

GetSpeed calculate status speed.

type StringIter 

type StringIter interface {
	Next() string
	HasNext() bool
}

StringIter is the iterator on a collection of strings.

type Stringer 

type Stringer interface {
	WriteToBuffer(*bytes.Buffer, bool)
	WriteToBufferInCsv(*bytes.Buffer, bool, *csvOption)
}

Stringer is an interface which represents sql types that support writing to buffer in sql/csv type

type TableDataIR 

type TableDataIR interface {
	Start(*tcontext.Context, *sql.Conn) error
	Rows() SQLRowIter
	Close() error
	RawRows() *sql.Rows
}

TableDataIR is table data intermediate representation. A table may be split into multiple TableDataIRs.

func SelectAllFromTable 

func SelectAllFromTable(conf *Config, meta TableMeta, partition, orderByClause string) TableDataIR

SelectAllFromTable dumps data serialized from a specified table

type TableInfo 

type TableInfo struct {
	Name         string
	AvgRowLength uint64
	Type         TableType
}

TableInfo is the table info for a table in database

func (*TableInfo) Equals 

func (t *TableInfo) Equals(other *TableInfo) bool

Equals returns true the table info is the same with another one

type TableMeta 

type TableMeta interface {
	DatabaseName() string
	TableName() string
	ColumnCount() uint
	ColumnTypes() []string
	ColumnNames() []string
	SelectedField() string
	SelectedLen() int
	SpecialComments() StringIter
	ShowCreateTable() string
	ShowCreateView() string
	AvgRowLength() uint64
	HasImplicitRowID() bool
}

TableMeta contains the meta information of a table.

type TableType 

type TableType int8

TableType represents the type of table 

const (
	// TableTypeBase represents the basic table
	TableTypeBase TableType = iota
	// TableTypeView represents the view table
	TableTypeView
	// TableTypeSequence represents the view table
	// TODO: need to be supported
	TableTypeSequence
)

func ParseTableType 

func ParseTableType(s string) (TableType, error)

ParseTableType parses table type string to TableType

func (TableType) String 

func (t TableType) String() string

type Task 

type Task interface {
	// Brief is the brief for a dumping task
	Brief() string
}

Task is a file dump task for dumpling, it could either be dumping database/table/view/policy metadata, table data

type TaskDatabaseMeta 

type TaskDatabaseMeta struct {
	Task
	DatabaseName      string
	CreateDatabaseSQL string
}

TaskDatabaseMeta is a dumping database metadata task

func NewTaskDatabaseMeta 

func NewTaskDatabaseMeta(dbName, createSQL string) *TaskDatabaseMeta

NewTaskDatabaseMeta returns a new dumping database metadata task

func (*TaskDatabaseMeta) Brief 

func (t *TaskDatabaseMeta) Brief() string

Brief implements task.Brief

type TaskPolicyMeta 

type TaskPolicyMeta struct {
	Task
	PolicyName      string
	CreatePolicySQL string
}

TaskPolicyMeta is a dumping view metadata task

func NewTaskPolicyMeta 

func NewTaskPolicyMeta(policyName, createPolicySQL string) *TaskPolicyMeta

NewTaskPolicyMeta returns a new dumping placement policy metadata task

func (*TaskPolicyMeta) Brief 

func (t *TaskPolicyMeta) Brief() string

Brief implements task.Brief

type TaskSequenceMeta 

type TaskSequenceMeta struct {
	Task
	DatabaseName      string
	SequenceName      string
	CreateSequenceSQL string
}

TaskSequenceMeta is a dumping sequence metadata task

func NewTaskSequenceMeta 

func NewTaskSequenceMeta(dbName, tblName, createSequenceSQL string) *TaskSequenceMeta

NewTaskSequenceMeta returns a new dumping sequence metadata task

func (*TaskSequenceMeta) Brief 

func (t *TaskSequenceMeta) Brief() string

Brief implements task.Brief

type TaskTableData 

type TaskTableData struct {
	Task
	Meta        TableMeta
	Data        TableDataIR
	ChunkIndex  int
	TotalChunks int
}

TaskTableData is a dumping table data task

func NewTaskTableData 

func NewTaskTableData(meta TableMeta, data TableDataIR, currentChunk, totalChunks int) *TaskTableData

NewTaskTableData returns a new dumping table data task

func (*TaskTableData) Brief 

func (t *TaskTableData) Brief() string

Brief implements task.Brief

type TaskTableMeta 

type TaskTableMeta struct {
	Task
	DatabaseName   string
	TableName      string
	CreateTableSQL string
}

TaskTableMeta is a dumping table metadata task

func NewTaskTableMeta 

func NewTaskTableMeta(dbName, tblName, createSQL string) *TaskTableMeta

NewTaskTableMeta returns a new dumping table metadata task

func (*TaskTableMeta) Brief 

func (t *TaskTableMeta) Brief() string

Brief implements task.Brief

type TaskViewMeta 

type TaskViewMeta struct {
	Task
	DatabaseName   string
	ViewName       string
	CreateTableSQL string
	CreateViewSQL  string
}

TaskViewMeta is a dumping view metadata task

func NewTaskViewMeta 

func NewTaskViewMeta(dbName, tblName, createTableSQL, createViewSQL string) *TaskViewMeta

NewTaskViewMeta returns a new dumping view metadata task

func (*TaskViewMeta) Brief 

func (t *TaskViewMeta) Brief() string

Brief implements task.Brief

type Writer 

type Writer struct {
	// contains filtered or unexported fields
}

Writer is the abstraction that keep pulling data from database and write to files. Every writer owns a snapshot connection, and will try to get a task from task stream chan and work on it.

func NewWriter 

func NewWriter(
	tctx *tcontext.Context,
	id int64,
	config *Config,
	conn *sql.Conn,
	externalStore storage.ExternalStorage,
	metrics *metrics,
) *Writer

NewWriter returns a new Writer with given configurations

func (*Writer) WriteDatabaseMeta 

func (w *Writer) WriteDatabaseMeta(db, createSQL string) error

WriteDatabaseMeta writes database meta to a file

func (*Writer) WritePolicyMeta 

func (w *Writer) WritePolicyMeta(policy, createSQL string) error

WritePolicyMeta writes database meta to a file

func (*Writer) WriteSequenceMeta 

func (w *Writer) WriteSequenceMeta(db, sequence, createSQL string) error

WriteSequenceMeta writes sequence meta to a file

func (*Writer) WriteTableData 

func (w *Writer) WriteTableData(meta TableMeta, ir TableDataIR, currentChunk int) error

WriteTableData writes table data to a file with retry

func (*Writer) WriteTableMeta 

func (w *Writer) WriteTableMeta(db, table, createSQL string) error

WriteTableMeta writes table meta to a file

func (*Writer) WriteViewMeta 

func (w *Writer) WriteViewMeta(db, view, createTableSQL, createViewSQL string) error

WriteViewMeta writes view meta to a file

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