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core.go
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core.go
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package memcache
import (
"github.com/QuangTung97/go-memcache/memcache/netconn"
"sync"
"sync/atomic"
)
type coreConnection struct {
responseReader *responseReader
sender *sender
shuttingDown uint32 // boolean
wg sync.WaitGroup
// job data
msgData []byte
cmdList *cmdListReader
}
func newCoreConnection(nc netconn.NetConn, options *memcacheOptions) *coreConnection {
cmdSender := newSender(nc, 10)
c := &coreConnection{
responseReader: newResponseReader(),
sender: cmdSender,
shuttingDown: 0,
msgData: make([]byte, options.bufferSize),
cmdList: newCmdListReader(cmdSender),
}
c.wg.Add(1)
go c.recvCommands()
return c
}
func (c *coreConnection) isShuttingDown() bool {
return atomic.LoadUint32(&c.shuttingDown) > 0
}
func (c *coreConnection) shutdown() {
atomic.StoreUint32(&c.shuttingDown, 1)
}
func (c *coreConnection) waitReceiverShutdown() {
c.wg.Wait()
}
func (c *coreConnection) publish(cmd *commandData) {
c.sender.publish(cmd)
}
func (c *coreConnection) resetNetConn(nc netconn.NetConn) {
c.sender.resetNetConn(nc)
}
func (c *coreConnection) waitForError() {
c.sender.waitForError()
}
func (c *coreConnection) recvCommands() {
defer c.wg.Done()
for {
err := c.recvSingleCommandData()
if err == ErrConnClosed { // cmd len == 0
return
}
if err != nil {
c.responseReader.reset()
reader := c.cmdList.current().reader
c.sender.setNetConnError(err, reader)
}
c.cmdList.current().setCompleted(err)
c.cmdList.next()
}
}
func (c *coreConnection) recvSingleCommandData() error {
cmdLen := c.cmdList.readIfExhausted()
if cmdLen == 0 {
return ErrConnClosed
}
current := c.cmdList.current()
c.responseReader.setCurrentCommand(current)
for count := 0; count < current.cmdCount; count++ {
err := c.readNextMemcacheCommandResponse(current)
if err != nil {
return err
}
}
return nil
}
func (c *coreConnection) readNextMemcacheCommandResponse(current *commandData) error {
for {
// Read from response reader
ok := c.responseReader.readNextData()
if ok {
return nil
}
if c.responseReader.hasError() != nil {
return c.responseReader.hasError() // TODO testing
}
n, err := current.reader.Read(c.msgData)
if err != nil {
return err
}
c.responseReader.recv(c.msgData[:n])
}
}
type cmdListReader struct {
sender *sender
cmdList []*commandData
length int
offset int
}
func newCmdListReader(sender *sender) *cmdListReader {
return &cmdListReader{
sender: sender,
cmdList: make([]*commandData, 128),
length: 0,
offset: 0,
}
}
func (c *cmdListReader) readIfExhausted() int {
if c.offset >= c.length {
c.length = c.sender.readSentCommands(c.cmdList)
c.offset = 0
}
return c.length
}
func (c *cmdListReader) current() *commandData {
return c.cmdList[c.offset]
}
func (c *cmdListReader) next() {
c.offset++
}