mysql

package
v0.0.0-...-982e07a Latest Latest
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 Go to latest Published: Dec 19, 2023 License: Apache-2.0 Imports: 34 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	BlobFlag           = 1 << 4
	NoDefaultValueFlag = 1 << 12
)

https://dev.mysql.com/doc/dev/mysql-server/latest/group__group__cs__column__definition__flags.html#details

View Source 
const (
	// https://dev.mysql.com/doc/refman/5.5/en/error-messages-server.html#error_er_query_interrupted
	ErQueryInterruptedCode  = 1317
	ErQueryInterruptedState = "70100"
)

Interrupted code constants.

View Source 
const (
	// ClientProtocol41 - https://dev.mysql.com/doc/internals/en/capability-flags.html#flag-CLIENT_PROTOCOL_41
	ClientProtocol41 = 0x00000200
	// SslRequest - https://dev.mysql.com/doc/internals/en/capability-flags.html#flag-CLIENT_SSL
	SslRequest = 0x00000800
	// ClientDeprecateEOF - https://dev.mysql.com/doc/dev/mysql-server/latest/group__group__cs__capabilities__flags.html#gaad8e6e886899e90e820d6c2e0248469d- 0x1000000
	ClientDeprecateEOF = 0x01000000
	// MARIADB_CLIENT_EXTENDED_TYPE_INFO - https://mariadb.com/kb/en/connection/#capabilities-
	MariaDBClientExtendedTypeInfo = 0x8
	// MARIADB_CLIENT_CACHE_METADATA - https://mariadb.com/kb/en/connection/#capabilities-
	MariaDBClientCacheMetadata = 0x10
)

MySQL protocol capability flags https://dev.mysql.com/doc/internals/en/capability-flags.html

View Source 
const (
	// OkPacket - https://dev.mysql.com/doc/internals/en/packet-OK_Packet.html
	OkPacket = 0x00
	// EOFPacket - https://dev.mysql.com/doc/internals/en/packet-EOF_Packet.html
	EOFPacket = 0xfe
	ErrPacket = 0xff
)

MySQL packets significant bytes.

View Source 
const (
	// PacketHeaderSize https://dev.mysql.com/doc/internals/en/mysql-packet.html#idm140406396409840
	PacketHeaderSize = 4
	// SequenceIDIndex last byte of header https://dev.mysql.com/doc/internals/en/mysql-packet.html#idm140406396409840
	SequenceIDIndex = 3
)
View Source 
const (
	// MaxPayloadLen https://dev.mysql.com/doc/internals/en/mysql-packet.html
	// each packet splits into packets of this size
	MaxPayloadLen int = 1<<24 - 1

	// ClientWaitDbTLSHandshake shows max time to wait for database TLS handshake
	ClientWaitDbTLSHandshake = 5

	// MariaDBDirectStatementID - https://mariadb.com/kb/en/com_stmt_execute/#specific-1-statement-id-value
	MariaDBDirectStatementID = 0xFFFFFFFF
)
View Source 
const (
	CommandQuit byte

	CommandQuery

	CommandStatementPrepare
	CommandStatementExecute
	CommandStatementSendLongData
	CommandStatementClose
	CommandStatementReset
)

Possible commands comment unused to avoid linter's warnings abous unused constant but leave correct order to re-use it in a future

View Source 
const PreparedStatementResponseLength = 12

PreparedStatementResponseLength MySQL prepared statement response packet length

View Source 
const QueryExecutionWasInterrupted = "Query execution was interrupted"

QueryExecutionWasInterrupted is a default message of the mysql's Query interrupted error

Variables

View Source 
var (
	ErrPreparedStatementNotSupported = errors.New("prepared statements are not used by DB server")
	ErrInvalidResponseLength         = errors.New("invalid prepared statement response format")
)

MySQL prepared statement response errors

View Source 
var ErrStatementNotFound = errors.New("no prepared statement with given statement-id")

ErrStatementNotFound Err returned by prepared statement registry.

View Source 
var ErrStatementNotPresentInRegistry = errors.New("prepared statement not present in registry")

ErrStatementNotPresentInRegistry represent an error that prepared statement already exist in session registry

View Source 
var TypeConfigurations = map[base_mysql.Type]TypeConfiguration{
	base_mysql.TypeString: {
		Charset:      8,
		ColumnLength: 255,
	},
	base_mysql.TypeLong: {
		Charset:      63,
		ColumnLength: 9,
	},
	base_mysql.TypeLongLong: {
		Charset:      63,
		ColumnLength: 20,
	},
	base_mysql.TypeBlob: {
		Charset:      63,
		ColumnLength: 65535,
	},
}

TypeConfigurations contains specific info for used in TA types supported charset - https://mariadb.com/kb/en/supported-character-sets-and-collations/ SELECT id, collation_name FROM information_schema.collations ORDER BY id;

Functions

func NewMysqlBoundValue 

func NewMysqlBoundValue(data []byte, format base.BoundValueFormat, paramType base_mysql.Type) (base.BoundValue, int, error)

NewMysqlBoundValue create base.BoundValue implementation object based on provided data and paramType

func NewMysqlCopyTextBoundValue 

func NewMysqlCopyTextBoundValue(data []byte, format base.BoundValueFormat, paramType base_mysql.Type) base.BoundValue

NewMysqlCopyTextBoundValue create base.BoundValue with copied input data

func NewProxyFactory 

func NewProxyFactory(proxySetting base.ProxySetting, store keystore.DecryptionKeyStore, tokenizer common.Pseudoanonymizer) (base.ProxyFactory, error)

NewProxyFactory return new proxyFactory

func NewQueryInterruptedError 

func NewQueryInterruptedError(isProtocol41 bool, msg string) []byte

NewQueryInterruptedError return packed QueryInterrupted error https://dev.mysql.com/doc/internals/en/packet-ERR_Packet.html

Types

type BaseMySQLDataProcessor 

type BaseMySQLDataProcessor struct{}

BaseMySQLDataProcessor implements processor and encode/decode binary intX values to text format which acceptable by Tokenizer

type ByteArrayDump 

type ByteArrayDump []byte

ByteArrayDump array

func (ByteArrayDump) Dump 

func (array ByteArrayDump) Dump() []byte

Dump returns array

type Capabilities 

type Capabilities struct {
	Client, Server                 uint32
	ClientExtended, ServerExtended uint32
}

Capabilities represent list of capabilities between client and server

func (*Capabilities) IsClientDeprecateEOF 

func (c *Capabilities) IsClientDeprecateEOF() bool

IsClientDeprecateEOF return true if flag set https://dev.mysql.com/doc/internals/en/capability-flags.html#flag-CLIENT_DEPRECATE_EOF

func (*Capabilities) IsClientSetProtocol41 

func (c *Capabilities) IsClientSetProtocol41() bool

IsClientSetProtocol41 return true if flag set

func (*Capabilities) IsSSLRequest 

func (c *Capabilities) IsSSLRequest() bool

IsSSLRequest return true if SslRequest flag up

func (*Capabilities) IsSetMariaDBCacheMetadata 

func (c *Capabilities) IsSetMariaDBCacheMetadata() bool

IsSetMariaDBCacheMetadata return true if MariaDBCacheMetadata capability set

func (*Capabilities) IsSetMariaDBClientExtendedTypeInfo 

func (c *Capabilities) IsSetMariaDBClientExtendedTypeInfo() bool

IsSetMariaDBClientExtendedTypeInfo return true if MariaDBClientExtendedTypeInfo capability set

func (*Capabilities) IsSetProtocol41 

func (c *Capabilities) IsSetProtocol41() bool

IsSetProtocol41 return true if Protocol41 capability set

func (*Capabilities) SetClientCapabilities 

func (c *Capabilities) SetClientCapabilities(cap, extendedCap uint32)

SetClientCapabilities set client default and extended capabilities

func (*Capabilities) SetServerCapabilities 

func (c *Capabilities) SetServerCapabilities(cap, extendedCap uint32)

SetServerCapabilities set server default and extended capabilities

type ColumnDescription 

type ColumnDescription struct {
	Schema           []byte
	Table            []byte
	OrgTable         []byte
	Name             []byte
	OrgName          []byte
	ExtendedTypeInfo []byte
	Charset          uint16
	ColumnLength     uint32
	Type             base.Type
	Flag             Flags
	Decimal          uint8

	DefaultValueLength uint64
	DefaultValue       []byte
	// contains filtered or unexported fields
}

ColumnDescription https://dev.mysql.com/doc/internals/en/com-query-response.html#packet-Protocol::ColumnDefinition41

func ParseResultField 

func ParseResultField(packet *Packet, mariaDBExtendedTypeInfo bool) (*ColumnDescription, error)

ParseResultField parses binary field and returns ColumnDescription

func (*ColumnDescription) Dump 

func (field *ColumnDescription) Dump() []byte

Dump https://dev.mysql.com/doc/internals/en/com-query-response.html#packet-Protocol::ColumnDefinition41

type DataDecoderProcessor 

type DataDecoderProcessor struct {
	BaseMySQLDataProcessor
}

DataDecoderProcessor implements processor and encode/decode binary intX values to text format which acceptable by Tokenizer

func NewDataDecoderProcessor 

func NewDataDecoderProcessor() *DataDecoderProcessor

NewDataDecoderProcessor return new data encoder from/to binary format for tokenization

func (*DataDecoderProcessor) ID 

func (p *DataDecoderProcessor) ID() string

ID return name of processor

func (*DataDecoderProcessor) OnColumn 

func (p *DataDecoderProcessor) OnColumn(ctx context.Context, data []byte) (context.Context, []byte, error)

OnColumn encode binary value to text and back. Should be before and after tokenizer processor

type DataEncoderProcessor 

type DataEncoderProcessor struct {
	BaseMySQLDataProcessor
}

DataEncoderProcessor implements processor and encode/decode binary intX values to text format which acceptable by Tokenizer

func NewDataEncoderProcessor 

func NewDataEncoderProcessor() *DataEncoderProcessor

NewDataEncoderProcessor return new data encoder from/to binary format for tokenization

func (*DataEncoderProcessor) ID 

func (p *DataEncoderProcessor) ID() string

ID return name of processor

func (*DataEncoderProcessor) OnColumn 

func (p *DataEncoderProcessor) OnColumn(ctx context.Context, data []byte) (context.Context, []byte, error)

OnColumn encode binary value to text and back. Should be before and after tokenizer processor

type DataTypeFormat 

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

DataTypeFormat implementation of type_awareness.DataTypeFormat for PostgreSQL

func NewDataTypeFormat 

func NewDataTypeFormat(columnInfo base.ColumnInfo, columnSetting config.ColumnEncryptionSetting) *DataTypeFormat

NewDataTypeFormat create new DataTypeFormat from ColumnInfo and ColumnEncryptionSetting

func (*DataTypeFormat) GetColumnName 

func (p *DataTypeFormat) GetColumnName() string

GetColumnName return ColumnName

func (*DataTypeFormat) GetDBDataTypeID 

func (p *DataTypeFormat) GetDBDataTypeID() uint32

GetDBDataTypeID return DBDataTypeID

func (*DataTypeFormat) GetDefaultDataValue 

func (p *DataTypeFormat) GetDefaultDataValue() *string

GetDefaultDataValue return DefaultDataValue

func (*DataTypeFormat) GetResponseOnFail 

func (p *DataTypeFormat) GetResponseOnFail() common.ResponseOnFail

GetResponseOnFail return ResponseOnFail

func (*DataTypeFormat) IsBinaryDataOperation 

func (p *DataTypeFormat) IsBinaryDataOperation() bool

IsBinaryDataOperation check from columnSetting if binaryOperation

func (*DataTypeFormat) IsBinaryFormat 

func (p *DataTypeFormat) IsBinaryFormat() bool

IsBinaryFormat check if columnInfo is binary

type Dumper 

type Dumper interface {
	Dump() []byte
}

Dumper dumps :)

type Flags 

type Flags uint16

Flags represent protocol ColumnDefinitionFlags https://dev.mysql.com/doc/dev/mysql-server/latest/group__group__cs__column__definition__flags.html

func (*Flags) ContainsFlag 

func (f *Flags) ContainsFlag(flag int) bool

ContainsFlag check if specific flag contains in flagset

func (*Flags) RemoveFlag 

func (f *Flags) RemoveFlag(flag int)

RemoveFlag remove flag from flag set

type Handler 

type Handler struct {
	Capabilities Capabilities
	// contains filtered or unexported fields
}

Handler handles connection between client and MySQL db

func NewMysqlProxy 

func NewMysqlProxy(session base.ClientSession, parser *sqlparser.Parser, setting base.ProxySetting) (*Handler, error)

NewMysqlProxy returns new Handler

func (*Handler) AddClientIDObserver 

func (handler *Handler) AddClientIDObserver(observer base.ClientIDObserver)

AddClientIDObserver subscribe new observer for clientID changes

func (*Handler) AddQueryObserver 

func (handler *Handler) AddQueryObserver(obs base.QueryObserver)

AddQueryObserver implement QueryObservable interface and proxy call to ObserverManager

func (*Handler) PreparedStatementResponseHandler 

func (handler *Handler) PreparedStatementResponseHandler(ctx context.Context, packet *Packet, dbConnection, clientConnection net.Conn) (err error)

PreparedStatementResponseHandler handles PreparedStatements response from DB

func (*Handler) ProxyClientConnection 

func (handler *Handler) ProxyClientConnection(ctx context.Context, errCh chan<- base.ProxyError)

ProxyClientConnection connects to database, writes data and executes DB commands

func (*Handler) ProxyDatabaseConnection 

func (handler *Handler) ProxyDatabaseConnection(ctx context.Context, errCh chan<- base.ProxyError)

ProxyDatabaseConnection handles connection from database, returns data to client

func (*Handler) QueryResponseHandler 

func (handler *Handler) QueryResponseHandler(ctx context.Context, packet *Packet, dbConnection, clientConnection net.Conn) (err error)

QueryResponseHandler parses data from database response

func (*Handler) RegisteredObserversCount 

func (handler *Handler) RegisteredObserversCount() int

RegisteredObserversCount return count of registered observers

func (*Handler) ResetStatementResponseHandler 

func (handler *Handler) ResetStatementResponseHandler(ctx context.Context, packet *Packet, dbConnection, clientConnection net.Conn) (err error)

ResetStatementResponseHandler handle response for Reset Request Statement

func (*Handler) SubscribeOnAllColumnsDecryption 

func (handler *Handler) SubscribeOnAllColumnsDecryption(subscriber base.DecryptionSubscriber)

SubscribeOnAllColumnsDecryption subscribes for OnColumn notifications on each column.

func (*Handler) Unsubscribe 

func (handler *Handler) Unsubscribe(subscriber base.DecryptionSubscriber)

Unsubscribe a subscriber from all OnColumn notifications.

type Packet 

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

Packet struct that store header and payload, reads it from connection

func NewPacket 

func NewPacket() *Packet

NewPacket returns new Packet

func ReadPacket 

func ReadPacket(connection net.Conn) (*Packet, error)

ReadPacket from connection and return Packet struct with data or error

func (*Packet) Dump 

func (packet *Packet) Dump() []byte

Dump returns packet header and data as []byte

func (*Packet) GetBindParameters 

func (packet *Packet) GetBindParameters(paramNum int) ([]base.BoundValue, error)

GetBindParameters returns packet Bind parameters

func (*Packet) GetData 

func (packet *Packet) GetData() []byte

GetData returns packet payload

func (*Packet) GetPacketPayloadLength 

func (packet *Packet) GetPacketPayloadLength() int

GetPacketPayloadLength returns payload length from first 3 bytes of header

func (*Packet) GetSequenceNumber 

func (packet *Packet) GetSequenceNumber() byte

GetSequenceNumber returned as byte

func (*Packet) IsEOF 

func (packet *Packet) IsEOF() bool

IsEOF return true if packet is OkPacket or EOFPacket

func (*Packet) IsErr 

func (packet *Packet) IsErr() bool

IsErr return true if packet has ErrPacket flag

func (*Packet) IsOK 

func (packet *Packet) IsOK() bool

IsOK return true if packet is OkPacket

func (*Packet) ReadPacket 

func (packet *Packet) ReadPacket(connection net.Conn) error

ReadPacket header and payload from connection or return error

func (*Packet) SetData 

func (packet *Packet) SetData(newData []byte)

SetData replace packet data with newData and update payload length in header

func (*Packet) SetParameters 

func (packet *Packet) SetParameters(values []base.BoundValue) (err error)

SetParameters updates statement parameters from Bind packet.

type PrepareStatementResponse 

type PrepareStatementResponse struct {
	StatementID                       uint32
	ColumnsNum, ParamsNum, WarningNum uint16
	Reserved                          uint8
}

PrepareStatementResponse used for handling MySQL prepared statement response https://dev.mysql.com/doc/internals/en/com-stmt-prepare-response.html status(1) + statement_id(4) + num_columns(2) + num_params(2) + reserved_1(1) + warning_count(2) status is ignored because of status checking on ProxyDatabaseConnection

func ParsePrepareStatementResponse 

func ParsePrepareStatementResponse(data []byte) (*PrepareStatementResponse, error)

ParsePrepareStatementResponse parse prepared statement from packet data

type PreparedStatement 

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

PreparedStatement is a MySQL PreparedStatement.

func NewPreparedStatement 

func NewPreparedStatement(statementID uint32, paramsNum uint16, sqlString string, sqlStatement sqlparser.Statement) *PreparedStatement

NewPreparedStatement makes a new prepared statement.

func NewPreparedStatementWithName 

func NewPreparedStatementWithName(name string, sqlString string, sqlStatement sqlparser.Statement) *PreparedStatement

NewPreparedStatementWithName makes a new prepared statement with name and zero paramsNum

func (*PreparedStatement) Name 

func (s *PreparedStatement) Name() string

Name return prepared statement name

func (*PreparedStatement) ParamsNum 

func (s *PreparedStatement) ParamsNum() int

ParamsNum return number of prepared statements params

func (*PreparedStatement) Query 

func (s *PreparedStatement) Query() sqlparser.Statement

Query returns the prepared query, in its parsed form.

func (*PreparedStatement) QueryText 

func (s *PreparedStatement) QueryText() string

QueryText returns sqlString of the prepared query, as provided by the client.

type PreparedStatementFieldTracker 

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

PreparedStatementFieldTracker track and replace DataType for column and param ColumnDefinition

func NewPreparedStatementFieldTracker 

func NewPreparedStatementFieldTracker(handler *Handler, columnNum uint16) PreparedStatementFieldTracker

NewPreparedStatementFieldTracker create new PreparedStatementFieldTracker

func (*PreparedStatementFieldTracker) ColumnsTrackHandler 

func (p *PreparedStatementFieldTracker) ColumnsTrackHandler(ctx context.Context, packet *Packet, _, clientConnection net.Conn) error

ColumnsTrackHandler implements ResponseHandler to track prepared statement columns

func (*PreparedStatementFieldTracker) ParamsTrackHandler 

func (p *PreparedStatementFieldTracker) ParamsTrackHandler(ctx context.Context, packet *Packet, _, clientConnection net.Conn) error

ParamsTrackHandler implements ResponseHandler to track prepare statement params

type PreparedStatementItem 

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

PreparedStatementItem represent an item to store in PreparedStatementRegistry

func NewPreparedStatementItem 

func NewPreparedStatementItem(stmt base.PreparedStatement, querySelectSettings []*encryptor.QueryDataItem) PreparedStatementItem

NewPreparedStatementItem create a new PreparedStatementItem

func (*PreparedStatementItem) Name 

func (r *PreparedStatementItem) Name() string

Name return PreparedStatementItem name

func (*PreparedStatementItem) QuerySettings 

func (r *PreparedStatementItem) QuerySettings() []*encryptor.QueryDataItem

QuerySettings return PreparedStatementItem querySettings

func (*PreparedStatementItem) Statement 

func (r *PreparedStatementItem) Statement() base.PreparedStatement

Statement return PreparedStatementItem statememt

type PreparedStatementRegistry 

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

PreparedStatementRegistry is a MySQL PreparedStatementRegistry.

func NewPreparedStatementRegistry 

func NewPreparedStatementRegistry() *PreparedStatementRegistry

NewPreparedStatementRegistry makes a new empty prepared statement registry.

func (*PreparedStatementRegistry) AddStatement 

func (r *PreparedStatementRegistry) AddStatement(statement PreparedStatementItem)

AddStatement adds a prepared statement to the registry. If an existing statement with the same name exists, it is replaced with the new one.

func (*PreparedStatementRegistry) DeleteStatementByID 

func (r *PreparedStatementRegistry) DeleteStatementByID(stmtID string) bool

DeleteStatementByID returns a prepared statement from the registry by its id, if it exists.

func (*PreparedStatementRegistry) StatementByID 

func (r *PreparedStatementRegistry) StatementByID(stmtID string) (PreparedStatementItem, error)

StatementByID returns a prepared statement from the registry by its id, if it exists.

type PreparedStatementsQuery 

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

PreparedStatementsQuery process MySQL SQL PreparedStatement

func NewMySQLPreparedStatementsQuery 

func NewMySQLPreparedStatementsQuery(proxyHandler *Handler, parser *sqlparser.Parser, schemaStore config.TableSchemaStore) *PreparedStatementsQuery

NewMySQLPreparedStatementsQuery create new PreparedStatementsQuery to handle SQL PreparedStatement in the following format https://dev.mysql.com/doc/refman/8.0/en/sql-prepared-statements.html

func (*PreparedStatementsQuery) ID 

func (e *PreparedStatementsQuery) ID() string

ID returns name of this QueryObserver.

func (*PreparedStatementsQuery) OnBind 

func (e *PreparedStatementsQuery) OnBind(ctx context.Context, statement sqlparser.Statement, values []base.BoundValue) ([]base.BoundValue, bool, error)

OnBind just a stub method of QueryObserver of PreparedStatementsQuery

func (*PreparedStatementsQuery) OnColumn 

func (e *PreparedStatementsQuery) OnColumn(ctx context.Context, data []byte) (context.Context, []byte, error)

OnColumn return new encryption setting context if info exist, otherwise column data and passed context will be returned

func (*PreparedStatementsQuery) OnQuery 

func (e *PreparedStatementsQuery) OnQuery(ctx context.Context, query base.OnQueryObject) (base.OnQueryObject, bool, error)

OnQuery processes query text before database sees it.

func (*PreparedStatementsQuery) SetDataEncryptor 

func (e *PreparedStatementsQuery) SetDataEncryptor(dataEncryptor encryptor.DataEncryptor)

SetDataEncryptor set encryptor.DataEncryptor

type ProtocolState 

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

ProtocolState keeps track of MySQL protocol state.

func NewProtocolState 

func NewProtocolState() *ProtocolState

NewProtocolState makes an initial MySQL state, awaiting for queries.

func (*ProtocolState) AddColumnDescription 

func (p *ProtocolState) AddColumnDescription(field *ColumnDescription)

AddColumnDescription add ColumnDescription

func (*ProtocolState) GetStmtID 

func (p *ProtocolState) GetStmtID() uint32

GetStmtID set stmtID value

func (*ProtocolState) PendingParse 

func (p *ProtocolState) PendingParse() base.OnQueryObject

PendingParse returns the pending prepared statement, if any.

func (*ProtocolState) SetPendingParse 

func (p *ProtocolState) SetPendingParse(obj base.OnQueryObject)

SetPendingParse set pendingParse value

func (*ProtocolState) SetStmtID 

func (p *ProtocolState) SetStmtID(id uint32)

SetStmtID set stmtID value

type ResponseHandler 

type ResponseHandler func(ctx context.Context, packet *Packet, dbConnection, clientConnection net.Conn) error

ResponseHandler database response header

type SQLError 

type SQLError struct {
	Code    uint16
	Message string
	State   string
}

SQLError is used for passing SQL errors

type TypeConfiguration 

type TypeConfiguration struct {
	// https://dev.mysql.com/doc/dev/mysql-server/latest/page_protocol_basic_character_set.html
	Charset      uint16
	ColumnLength uint32
	// https://dev.mysql.com/doc/dev/mysql-server/latest/page_protocol_com_query_response_text_resultset_column_definition.html
	Decimal uint8
}

TypeConfiguration represent configurations details of specific type

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