forked from steveyen/grouter
/
target-memory.go
94 lines (85 loc) · 2.26 KB
/
target-memory.go
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package grouter
import (
"encoding/binary"
"github.com/couchbase/gomemcached"
)
type MemoryStorage struct {
data map[string]gomemcached.MCItem
cas uint64
incoming chan []Request
}
type MemoryStorageHandler func(s *MemoryStorage, req Request)
var MemoryStorageHandlers = map[gomemcached.CommandCode]MemoryStorageHandler{
gomemcached.GET: func(s *MemoryStorage, req Request) {
ret := &gomemcached.MCResponse{
Opcode: req.Req.Opcode,
Opaque: req.Req.Opaque,
Key: req.Req.Key,
}
if item, ok := s.data[string(req.Req.Key)]; ok {
ret.Status = gomemcached.SUCCESS
ret.Extras = make([]byte, 4)
binary.BigEndian.PutUint32(ret.Extras, item.Flags)
ret.Cas = item.Cas
ret.Body = item.Data
} else {
ret.Status = gomemcached.KEY_ENOENT
}
req.Res <- ret
},
gomemcached.SET: func(s *MemoryStorage, req Request) {
s.cas += 1
s.data[string(req.Req.Key)] = gomemcached.MCItem{
Flags: binary.BigEndian.Uint32(req.Req.Extras),
Expiration: binary.BigEndian.Uint32(req.Req.Extras[4:]),
Cas: s.cas,
Data: req.Req.Body,
}
req.Res <- &gomemcached.MCResponse{
Opcode: req.Req.Opcode,
Status: gomemcached.SUCCESS,
Opaque: req.Req.Opaque,
Cas: s.cas,
Key: req.Req.Key,
}
},
gomemcached.DELETE: func(s *MemoryStorage, req Request) {
ret := &gomemcached.MCResponse{
Opcode: req.Req.Opcode,
Opaque: req.Req.Opaque,
Key: req.Req.Key,
}
if _, ok := s.data[string(req.Req.Key)]; ok {
delete(s.data, string(req.Req.Key))
ret.Status = gomemcached.SUCCESS
} else {
ret.Status = gomemcached.KEY_ENOENT
}
req.Res <- ret
},
}
func (s MemoryStorage) PickChannel(clientNum uint32, bucket string) chan []Request {
return s.incoming
}
func MemoryStorageStart(spec string, params Params, statsChan chan Stats) Target {
s := MemoryStorage{
data: make(map[string]gomemcached.MCItem),
incoming: make(chan []Request, params.TargetChanSize),
}
go func() {
for reqs := range s.incoming {
for _, req := range reqs {
if h, ok := MemoryStorageHandlers[req.Req.Opcode]; ok {
h(&s, req)
} else {
req.Res <- &gomemcached.MCResponse{
Opcode: req.Req.Opcode,
Status: gomemcached.UNKNOWN_COMMAND,
Opaque: req.Req.Opaque,
}
}
}
}
}()
return s
}