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server.go
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server.go
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// go-redis-server is a helper library for building server software capable of speaking the redis protocol.
// This could be an alternate implementation of redis, a custom proxy to redis,
// or even a completely different backend capable of "masquerading" its API as a redis database.
package redis
import (
"fmt"
"io"
"io/ioutil"
"net"
"reflect"
)
type Server struct {
Proto string
Addr string // TCP address to listen on, ":6389" if empty
MonitorChans []chan string
methods map[string]HandlerFn
}
func (srv *Server) ListenAndServe() error {
addr := srv.Addr
if srv.Proto == "" {
srv.Proto = "tcp"
}
if srv.Proto == "unix" && addr == "" {
addr = "/tmp/redis.sock"
} else if addr == "" {
addr = ":6389"
}
l, e := net.Listen(srv.Proto, addr)
if e != nil {
return e
}
return srv.Serve(l)
}
// Serve accepts incoming connections on the Listener l, creating a
// new service goroutine for each. The service goroutines read requests and
// then call srv.Handler to reply to them.
func (srv *Server) Serve(l net.Listener) error {
defer l.Close()
srv.MonitorChans = []chan string{}
for {
rw, err := l.Accept()
if err != nil {
return err
}
go srv.ServeClient(rw)
}
}
// Serve starts a new redis session, using `conn` as a transport.
// It reads commands using the redis protocol, passes them to `handler`,
// and returns the result.
func (srv *Server) ServeClient(conn net.Conn) (err error) {
defer func() {
if err != nil {
fmt.Fprintf(conn, "-%s\n", err)
}
conn.Close()
}()
clientChan := make(chan struct{})
// Read on `conn` in order to detect client disconnect
defer func() {
// Close chan in order to trigger eventual selects
defer close(clientChan)
defer Debugf("Client disconnected")
// FIXME: move conn within the request.
if false {
io.Copy(ioutil.Discard, conn)
}
}()
var clientAddr string
switch co := conn.(type) {
case *net.UnixConn:
f, err := conn.(*net.UnixConn).File()
if err != nil {
return err
}
clientAddr = f.Name()
default:
clientAddr = co.RemoteAddr().String()
}
for {
request, err := parseRequest(conn)
if err != nil {
return err
}
request.Host = clientAddr
request.ClientChan = clientChan
reply, err := srv.Apply(request)
if err != nil {
return err
}
if _, err = reply.WriteTo(conn); err != nil {
return err
}
}
return nil
}
func (srv *Server) ServeReplClient(conn net.Conn) (err error) {
defer func() {
if err != nil {
fmt.Fprintf(conn, "-%s\n", err)
}
conn.Close()
}()
clientChan := make(chan struct{})
// Read on `conn` in order to detect client disconnect
defer func() {
// Close chan in order to trigger eventual selects
defer close(clientChan)
defer Debugf("Client disconnected")
// FIXME: move conn within the request.
if false {
io.Copy(ioutil.Discard, conn)
}
}()
var clientAddr string
switch co := conn.(type) {
case *net.UnixConn:
f, err := conn.(*net.UnixConn).File()
if err != nil {
return err
}
clientAddr = f.Name()
default:
clientAddr = co.RemoteAddr().String()
}
for {
request, err := parseRequest(conn)
if err != nil {
return err
}
request.Host = clientAddr
request.ClientChan = clientChan
_, err = srv.Apply(request)
if err != nil {
return err
}
}
return nil
}
func NewServer(c *Config) (*Server, error) {
srv := &Server{
Proto: c.proto,
MonitorChans: []chan string{},
methods: make(map[string]HandlerFn),
}
if srv.Proto == "unix" {
srv.Addr = c.host
} else {
srv.Addr = fmt.Sprintf("%s:%d", c.host, c.port)
}
if c.handler == nil {
c.handler = NewDefaultHandler()
}
rh := reflect.TypeOf(c.handler)
for i := 0; i < rh.NumMethod(); i++ {
method := rh.Method(i)
if method.Name[0] > 'a' && method.Name[0] < 'z' {
continue
}
println(method.Name)
handlerFn, err := srv.createHandlerFn(c.handler, &method.Func)
if err != nil {
return nil, err
}
srv.Register(method.Name, handlerFn)
}
return srv, nil
}