mirror of
https://github.com/go-gitea/gitea.git
synced 2024-12-05 17:13:51 +08:00
281 lines
6.0 KiB
Go
281 lines
6.0 KiB
Go
package gomemcached
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import (
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"encoding/binary"
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"fmt"
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"io"
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"sync"
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)
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// MCResponse is memcached response
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type MCResponse struct {
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// The command opcode of the command that sent the request
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Opcode CommandCode
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// The status of the response
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Status Status
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// The opaque sent in the request
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Opaque uint32
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// The CAS identifier (if applicable)
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Cas uint64
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// Extras, key, and body for this response
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Extras, Key, Body []byte
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// If true, this represents a fatal condition and we should hang up
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Fatal bool
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// Datatype identifier
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DataType uint8
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}
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// A debugging string representation of this response
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func (res MCResponse) String() string {
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return fmt.Sprintf("{MCResponse status=%v keylen=%d, extralen=%d, bodylen=%d}",
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res.Status, len(res.Key), len(res.Extras), len(res.Body))
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}
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// Response as an error.
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func (res *MCResponse) Error() string {
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return fmt.Sprintf("MCResponse status=%v, opcode=%v, opaque=%v, msg: %s",
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res.Status, res.Opcode, res.Opaque, string(res.Body))
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}
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func errStatus(e error) Status {
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status := Status(0xffff)
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if res, ok := e.(*MCResponse); ok {
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status = res.Status
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}
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return status
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}
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// IsNotFound is true if this error represents a "not found" response.
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func IsNotFound(e error) bool {
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return errStatus(e) == KEY_ENOENT
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}
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// IsFatal is false if this error isn't believed to be fatal to a connection.
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func IsFatal(e error) bool {
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if e == nil {
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return false
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}
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_, ok := isFatal[errStatus(e)]
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if ok {
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return true
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}
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return false
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}
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// Size is number of bytes this response consumes on the wire.
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func (res *MCResponse) Size() int {
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return HDR_LEN + len(res.Extras) + len(res.Key) + len(res.Body)
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}
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func (res *MCResponse) fillHeaderBytes(data []byte) int {
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pos := 0
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data[pos] = RES_MAGIC
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pos++
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data[pos] = byte(res.Opcode)
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pos++
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binary.BigEndian.PutUint16(data[pos:pos+2],
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uint16(len(res.Key)))
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pos += 2
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// 4
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data[pos] = byte(len(res.Extras))
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pos++
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// Data type
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if res.DataType != 0 {
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data[pos] = byte(res.DataType)
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} else {
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data[pos] = 0
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}
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pos++
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binary.BigEndian.PutUint16(data[pos:pos+2], uint16(res.Status))
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pos += 2
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// 8
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binary.BigEndian.PutUint32(data[pos:pos+4],
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uint32(len(res.Body)+len(res.Key)+len(res.Extras)))
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pos += 4
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// 12
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binary.BigEndian.PutUint32(data[pos:pos+4], res.Opaque)
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pos += 4
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// 16
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binary.BigEndian.PutUint64(data[pos:pos+8], res.Cas)
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pos += 8
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if len(res.Extras) > 0 {
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copy(data[pos:pos+len(res.Extras)], res.Extras)
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pos += len(res.Extras)
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}
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if len(res.Key) > 0 {
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copy(data[pos:pos+len(res.Key)], res.Key)
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pos += len(res.Key)
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}
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return pos
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}
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// HeaderBytes will get just the header bytes for this response.
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func (res *MCResponse) HeaderBytes() []byte {
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data := make([]byte, HDR_LEN+len(res.Extras)+len(res.Key))
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res.fillHeaderBytes(data)
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return data
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}
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// Bytes will return the actual bytes transmitted for this response.
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func (res *MCResponse) Bytes() []byte {
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data := make([]byte, res.Size())
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pos := res.fillHeaderBytes(data)
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copy(data[pos:pos+len(res.Body)], res.Body)
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return data
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}
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// Transmit will send this response message across a writer.
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func (res *MCResponse) Transmit(w io.Writer) (n int, err error) {
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if len(res.Body) < 128 {
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n, err = w.Write(res.Bytes())
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} else {
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n, err = w.Write(res.HeaderBytes())
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if err == nil {
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m := 0
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m, err = w.Write(res.Body)
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m += n
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}
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}
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return
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}
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// Receive will fill this MCResponse with the data from this reader.
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func (res *MCResponse) Receive(r io.Reader, hdrBytes []byte) (n int, err error) {
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return res.ReceiveWithBuf(r, hdrBytes, nil)
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}
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// ReceiveWithBuf takes an optional pre-allocated []byte buf which
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// will be used if its capacity is large enough, otherwise a new
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// []byte slice is allocated.
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func (res *MCResponse) ReceiveWithBuf(r io.Reader, hdrBytes, buf []byte) (n int, err error) {
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if len(hdrBytes) < HDR_LEN {
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hdrBytes = []byte{
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0}
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}
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n, err = io.ReadFull(r, hdrBytes)
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if err != nil {
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return n, err
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}
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if hdrBytes[0] != RES_MAGIC && hdrBytes[0] != REQ_MAGIC {
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return n, fmt.Errorf("bad magic: 0x%02x", hdrBytes[0])
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}
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klen := int(binary.BigEndian.Uint16(hdrBytes[2:4]))
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elen := int(hdrBytes[4])
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res.Opcode = CommandCode(hdrBytes[1])
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res.DataType = uint8(hdrBytes[5])
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res.Status = Status(binary.BigEndian.Uint16(hdrBytes[6:8]))
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res.Opaque = binary.BigEndian.Uint32(hdrBytes[12:16])
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res.Cas = binary.BigEndian.Uint64(hdrBytes[16:24])
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bodyLen := int(binary.BigEndian.Uint32(hdrBytes[8:12])) - (klen + elen)
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//defer function to debug the panic seen with MB-15557
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defer func() {
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if e := recover(); e != nil {
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err = fmt.Errorf(`Panic in Receive. Response %v \n
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key len %v extra len %v bodylen %v`, res, klen, elen, bodyLen)
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}
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}()
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bufNeed := klen + elen + bodyLen
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if buf != nil && cap(buf) >= bufNeed {
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buf = buf[0:bufNeed]
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} else {
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buf = make([]byte, bufNeed)
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}
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m, err := io.ReadFull(r, buf)
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if err == nil {
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res.Extras = buf[0:elen]
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res.Key = buf[elen : klen+elen]
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res.Body = buf[klen+elen:]
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}
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return n + m, err
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}
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type MCResponsePool struct {
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pool *sync.Pool
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}
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func NewMCResponsePool() *MCResponsePool {
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rv := &MCResponsePool{
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pool: &sync.Pool{
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New: func() interface{} {
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return &MCResponse{}
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},
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},
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}
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return rv
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}
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func (this *MCResponsePool) Get() *MCResponse {
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return this.pool.Get().(*MCResponse)
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}
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func (this *MCResponsePool) Put(r *MCResponse) {
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if r == nil {
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return
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}
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r.Extras = nil
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r.Key = nil
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r.Body = nil
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r.Fatal = false
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this.pool.Put(r)
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}
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type StringMCResponsePool struct {
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pool *sync.Pool
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size int
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}
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func NewStringMCResponsePool(size int) *StringMCResponsePool {
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rv := &StringMCResponsePool{
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pool: &sync.Pool{
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New: func() interface{} {
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return make(map[string]*MCResponse, size)
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},
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},
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size: size,
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}
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return rv
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}
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func (this *StringMCResponsePool) Get() map[string]*MCResponse {
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return this.pool.Get().(map[string]*MCResponse)
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}
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func (this *StringMCResponsePool) Put(m map[string]*MCResponse) {
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if m == nil || len(m) > 2*this.size {
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return
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}
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for k := range m {
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m[k] = nil
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delete(m, k)
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}
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this.pool.Put(m)
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}
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