/
server.go
93 lines (81 loc) · 1.8 KB
/
server.go
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package cmd
import (
"fmt"
"log"
"strings"
"sync"
"github.com/arriqaaq/flashdb"
"github.com/tidwall/redcon"
)
type cmdFunc func(*flashdb.FlashDB, []string) (interface{}, error)
var commands = make(map[string]cmdFunc)
func addExecCommand(cmd string, cmdFunc cmdFunc) {
commands[strings.ToLower(cmd)] = cmdFunc
}
type Server struct {
server *redcon.Server
db *flashdb.FlashDB
closed bool
mu sync.Mutex
}
func NewServer(config *flashdb.Config) (*Server, error) {
db, err := flashdb.New(config)
if err != nil {
return nil, err
}
return &Server{db: db}, nil
}
func (s *Server) Listen(addr string) {
svr := redcon.NewServerNetwork("tcp", addr,
func(conn redcon.Conn, cmd redcon.Command) {
s.handleCmd(conn, cmd)
},
func(conn redcon.Conn) bool {
return true
},
func(conn redcon.Conn, err error) {
},
)
s.server = svr
log.Println("FlashDB is running, ready to accept connections.")
if err := svr.ListenAndServe(); err != nil {
log.Printf("listen and serve ocuurs error: %+v", err)
}
}
func (s *Server) Stop() {
if s.closed {
return
}
s.mu.Lock()
s.closed = true
if err := s.server.Close(); err != nil {
log.Printf("close redcon err: %+v\n", err)
}
s.mu.Unlock()
}
func (s *Server) handleCmd(conn redcon.Conn, cmd redcon.Command) {
defer func() {
if r := recover(); r != nil {
log.Printf("panic when handle the cmd: %+v", r)
}
}()
command := strings.ToLower(string(cmd.Args[0]))
exec, exist := commands[command]
if !exist {
conn.WriteError(fmt.Sprintf("ERR unknown command '%s'", command))
return
}
args := make([]string, 0, len(cmd.Args)-1)
for i, bytes := range cmd.Args {
if i == 0 {
continue
}
args = append(args, string(bytes))
}
reply, err := exec(s.db, args)
if err != nil {
conn.WriteError(err.Error())
return
}
conn.WriteAny(reply)
}