wire

package
v0.0.0-...-bb56650 Latest Latest
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 Go to latest Published: Feb 20, 2024 License: MIT Imports: 21 Imported by: 0

Documentation

Overview

Package wire provides wire protocol implementation.

Index

Constants

View Source 
const (
	// OpCodeReply is used for the initial handshake with old clients.
	// It is not used otherwise and is deprecated.
	OpCodeReply = OpCode(1) // OP_REPLY

	// OpCodeUpdate is deprecated.
	OpCodeUpdate = OpCode(2001) // OP_UPDATE

	// OpCodeInsert is deprecated and unused.
	OpCodeInsert = OpCode(2002) // OP_INSERT

	// OpCodeGetByOID is deprecated and unused.
	OpCodeGetByOID = OpCode(2003) // OP_GET_BY_OID

	// OpCodeQuery is used for the initial handshake with old clients.
	// It is not used otherwise and is deprecated.
	OpCodeQuery = OpCode(2004) // OP_QUERY

	// OpCodeGetMore is deprecated and unused.
	OpCodeGetMore = OpCode(2005) // OP_GET_MORE

	// OpCodeDelete is deprecated and unused.
	OpCodeDelete = OpCode(2006) // OP_DELETE

	// OpCodeKillCursors is deprecated and unused.
	OpCodeKillCursors = OpCode(2007) // OP_KILL_CURSORS

	// OpCodeCompressed is not implemented yet.
	OpCodeCompressed = OpCode(2012) // OP_COMPRESSED

	// OpCodeMsg is the main operation for client-server communication.
	OpCodeMsg = OpCode(2013) // OP_MSG
)
View Source 
const (
	// MsgHeaderLen is an expected len of the header.
	MsgHeaderLen = 16

	// MaxMsgLen is the maximum message length.
	MaxMsgLen = 48000000
)
View Source 
const (
	// OpMsgChecksumPresent indicates that there is a CRC-32C checksum in a message.
	OpMsgChecksumPresent = OpMsgFlagBit(1 << 0) // checksumPresent

	// OpMsgMoreToCome indicates that there is another message coming, no need to do anything for it.
	OpMsgMoreToCome = OpMsgFlagBit(1 << 1) // moreToCome

	// OpMsgExhaustAllowed indicates that client can handle multiple replies.
	OpMsgExhaustAllowed = OpMsgFlagBit(1 << 16) // exhaustAllowed
)
View Source 
const (
	// OpQueryTailableCursor indicates that the cursor will not be closed.
	OpQueryTailableCursor = OpQueryFlagBit(1 << 1) // TailableCursor

	// OpQuerySlaveOk indicates that query can run on a replica slave.
	OpQuerySlaveOk = OpQueryFlagBit(1 << 2) // SlaveOk

	// OpQueryOplogReplay is deprecated.
	OpQueryOplogReplay = OpQueryFlagBit(1 << 3) // OplogReplay

	// OpQueryNoCursorTimeout disables cursor timeouts.
	OpQueryNoCursorTimeout = OpQueryFlagBit(1 << 4) // NoCursorTimeout

	// OpQueryAwaitData together with OpQueryTailableCursor, waits for data instead of returning it.
	OpQueryAwaitData = OpQueryFlagBit(1 << 5) // AwaitData

	// OpQueryExhaust indicates that server can divide data into multiple streams and expect that client can handle it.
	OpQueryExhaust = OpQueryFlagBit(1 << 6) // Exhaust

	// OpQueryPartial ignore error and give partial results.
	OpQueryPartial = OpQueryFlagBit(1 << 7) // Partial
)
View Source 
const (
	// OpReplyCursorNotFound indicates that the cursor is no longer exist at the server.
	OpReplyCursorNotFound = OpReplyFlagBit(1 << 0) // CursorNotFound

	// OpReplyQueryFailure reports query has failed.
	OpReplyQueryFailure = OpReplyFlagBit(1 << 1) // QueryFailure

	// OpReplyShardConfigStale indicates that shard config is outdated.
	OpReplyShardConfigStale = OpReplyFlagBit(1 << 2) // ShardConfigStale

	// OpReplyAwaitCapable indicates server supports AwaitData Query option.
	OpReplyAwaitCapable = OpReplyFlagBit(1 << 3) // AwaitCapable
)

Variables

View Source 
var ErrZeroRead = errors.New("zero bytes read")

ErrZeroRead is returned when zero bytes was read from connection, indicating that connection was closed by the client.

Functions

func ReadMessage 

func ReadMessage(r *bufio.Reader) (*MsgHeader, MsgBody, error)

ReadMessage reads from reader and returns wire header and body.

Error is (possibly wrapped) ErrZeroRead if zero bytes was read.

func WriteMessage 

func WriteMessage(w *bufio.Writer, header *MsgHeader, msg MsgBody) error

WriteMessage validates msg and headers and writes them to the writer.

Types

type MsgBody 

type MsgBody interface {
	encoding.BinaryUnmarshaler
	encoding.BinaryMarshaler
	fmt.Stringer
	// contains filtered or unexported methods
}

MsgBody is a wire protocol message body.

type MsgHeader 

type MsgHeader struct {
	MessageLength int32
	RequestID     int32
	ResponseTo    int32
	OpCode        OpCode
}

MsgHeader in general, each message consists of a standard message header followed by request-specific data.

func (*MsgHeader) MarshalBinary 

func (msg *MsgHeader) MarshalBinary() ([]byte, error)

MarshalBinary writes a MsgHeader to a byte array.

func (*MsgHeader) String 

func (msg *MsgHeader) String() string

String returns a string representation for logging.

type OpCode 

type OpCode int32

OpCode represents wire operation code.

func (OpCode) String 

func (i OpCode) String() string

type OpMsg 

type OpMsg struct {
	FlagBits OpMsgFlags
	// contains filtered or unexported fields
}

OpMsg is an extensible message format designed to subsume the functionality of other opcodes.

func (*OpMsg) Document 

func (msg *OpMsg) Document() (*types.Document, error)

Document returns the value of msg as a types.Document.

func (*OpMsg) MarshalBinary 

func (msg *OpMsg) MarshalBinary() ([]byte, error)

MarshalBinary writes an OpMsg to a byte array.

func (*OpMsg) SetSections 

func (msg *OpMsg) SetSections(sections ...OpMsgSection) error

SetSections of the OpMsg.

func (*OpMsg) String 

func (msg *OpMsg) String() string

String returns a string representation for logging.

func (*OpMsg) UnmarshalBinary 

func (msg *OpMsg) UnmarshalBinary(b []byte) error

UnmarshalBinary reads an OpMsg from a byte array.

type OpMsgFlagBit 

type OpMsgFlagBit flagBit

OpMsgFlagBit integer is a bitmask encoding flags that modify the format and behavior of OpMsg.

func (OpMsgFlagBit) String 

func (i OpMsgFlagBit) String() string

type OpMsgFlags 

type OpMsgFlags flags

OpMsgFlags type unint32.

func (OpMsgFlags) FlagSet 

func (f OpMsgFlags) FlagSet(bit OpMsgFlagBit) bool

FlagSet check if flag is set.

func (OpMsgFlags) String 

func (f OpMsgFlags) String() string

String returns OpMsgFlags as a string.

type OpMsgSection 

type OpMsgSection struct {
	Kind       byte
	Identifier string
	Documents  []*types.Document // TODO https://github.com/FerretDB/FerretDB/issues/274
}

OpMsgSection is one or more sections contained in an OpMsg.

type OpQuery 

type OpQuery struct {
	Flags                OpQueryFlags
	FullCollectionName   string
	NumberToSkip         int32
	NumberToReturn       int32
	Query                *types.Document
	ReturnFieldsSelector *types.Document // may be nil
}

OpQuery is used to query the database for documents in a collection.

func (*OpQuery) MarshalBinary 

func (query *OpQuery) MarshalBinary() ([]byte, error)

MarshalBinary writes an OpQuery to a byte array.

func (*OpQuery) String 

func (query *OpQuery) String() string

String returns a string representation for logging.

func (*OpQuery) UnmarshalBinary 

func (query *OpQuery) UnmarshalBinary(b []byte) error

UnmarshalBinary reads an OpQuery from a byte array.

type OpQueryFlagBit 

type OpQueryFlagBit flagBit

OpQueryFlagBit an integer bitmask for the operation.

func (OpQueryFlagBit) String 

func (i OpQueryFlagBit) String() string

type OpQueryFlags 

type OpQueryFlags flags

OpQueryFlags enables String() and FlagSet methods for flags.

func (OpQueryFlags) FlagSet 

func (f OpQueryFlags) FlagSet(bit OpQueryFlagBit) bool

FlagSet return true if flag set.

func (OpQueryFlags) String 

func (f OpQueryFlags) String() string

String interface implementation for query flags.

type OpReply 

type OpReply struct {
	ResponseFlags  OpReplyFlags
	CursorID       int64
	StartingFrom   int32
	NumberReturned int32
	Documents      []*types.Document
}

OpReply is a message sent by the MongoDB database in response to an OpQuery.

func (*OpReply) MarshalBinary 

func (reply *OpReply) MarshalBinary() ([]byte, error)

MarshalBinary writes an OpReply to a byte array.

func (*OpReply) String 

func (reply *OpReply) String() string

String returns a string representation for logging.

func (*OpReply) UnmarshalBinary 

func (reply *OpReply) UnmarshalBinary(b []byte) error

UnmarshalBinary reads an OpReply from a byte array.

type OpReplyFlagBit 

type OpReplyFlagBit flagBit

OpReplyFlagBit is a bit vector to specify OP_REPLY flags.

func (OpReplyFlagBit) String 

func (i OpReplyFlagBit) String() string

type OpReplyFlags 

type OpReplyFlags flags

OpReplyFlags are OP_REPLY flags.

func (OpReplyFlags) FlagSet 

func (f OpReplyFlags) FlagSet(bit OpReplyFlagBit) bool

FlagSet returns true if the flag is set.

func (OpReplyFlags) String 

func (f OpReplyFlags) String() string

String returns string value for OP_REPLY.

type Record 

type Record struct {
	// those may be unset if message is invalid
	Header *MsgHeader
	Body   MsgBody

	// those are always set
	HeaderB []byte
	BodyB   []byte
}

Record represents a single recorded wire protocol message, loaded from a .bin file.

func LoadRecords 

func LoadRecords(dir string, limit int) ([]Record, error)

LoadRecords finds all .bin files recursively, selects up to the limit at random (or all if limit <= 0), and parses them.

type ValidationError 

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

ValidationError is used for reporting validation errors.

func (*ValidationError) Error 

func (v *ValidationError) Error() string

Error implements error interface.

Source Files

View all Source files

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