/usr/share/gocode/src/github.com/alicebob/miniredis/server/server.go is in golang-github-alicebob-miniredis-dev 2.2.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 | package server
import (
"bufio"
"fmt"
"net"
"strings"
"sync"
)
func errUnknownCommand(cmd string) string {
return fmt.Sprintf("ERR unknown command '%s'", strings.ToLower(cmd))
}
// Cmd is what Register expects
type Cmd func(c *Peer, cmd string, args []string)
// Server is a simple redis server
type Server struct {
l net.Listener
cmds map[string]Cmd
peers map[net.Conn]struct{}
mu sync.Mutex
wg sync.WaitGroup
infoConns int
infoCmds int
}
// NewServer makes a server listening on addr. Close with .Close().
func NewServer(addr string) (*Server, error) {
s := Server{
cmds: map[string]Cmd{},
peers: map[net.Conn]struct{}{},
}
l, err := net.Listen("tcp", addr)
if err != nil {
return nil, err
}
s.l = l
s.wg.Add(1)
go func() {
defer s.wg.Done()
s.serve(l)
}()
return &s, nil
}
func (s *Server) serve(l net.Listener) {
for {
conn, err := l.Accept()
if err != nil {
return
}
s.wg.Add(1)
go func() {
defer s.wg.Done()
defer conn.Close()
s.mu.Lock()
s.peers[conn] = struct{}{}
s.infoConns++
s.mu.Unlock()
s.servePeer(conn)
s.mu.Lock()
delete(s.peers, conn)
s.mu.Unlock()
}()
}
}
// Addr has the net.Addr struct
func (s *Server) Addr() *net.TCPAddr {
s.mu.Lock()
defer s.mu.Unlock()
if s.l == nil {
return nil
}
return s.l.Addr().(*net.TCPAddr)
}
// Close a server started with NewServer. It will wait until all clients are
// closed.
func (s *Server) Close() {
s.mu.Lock()
if s.l != nil {
s.l.Close()
}
s.l = nil
for c := range s.peers {
c.Close()
}
s.mu.Unlock()
s.wg.Wait()
}
// Register a command. It can't have been registered before. Safe to call on a
// running server.
func (s *Server) Register(cmd string, f Cmd) error {
s.mu.Lock()
defer s.mu.Unlock()
cmd = strings.ToUpper(cmd)
if _, ok := s.cmds[cmd]; ok {
return fmt.Errorf("command already registered: %s", cmd)
}
s.cmds[cmd] = f
return nil
}
func (s *Server) servePeer(c net.Conn) {
r := bufio.NewReader(c)
cl := &Peer{
w: bufio.NewWriter(c),
}
for {
args, err := readArray(r)
if err != nil {
return
}
s.dispatch(cl, args)
cl.w.Flush()
if cl.closed {
c.Close()
return
}
}
}
func (s *Server) dispatch(c *Peer, args []string) {
cmd, args := strings.ToUpper(args[0]), args[1:]
s.mu.Lock()
cb, ok := s.cmds[cmd]
s.mu.Unlock()
if !ok {
c.WriteError(errUnknownCommand(cmd))
return
}
s.mu.Lock()
s.infoCmds++
s.mu.Unlock()
cb(c, cmd, args)
}
// TotalCommands is total (known) commands since this the server started
func (s *Server) TotalCommands() int {
s.mu.Lock()
defer s.mu.Unlock()
return s.infoCmds
}
// ClientsLen gives the number of connected clients right now
func (s *Server) ClientsLen() int {
s.mu.Lock()
defer s.mu.Unlock()
return len(s.peers)
}
// TotalConnections give the number of clients connected since the server
// started, including the currently connected ones
func (s *Server) TotalConnections() int {
s.mu.Lock()
defer s.mu.Unlock()
return s.infoConns
}
// Peer is a client connected to the server
type Peer struct {
w *bufio.Writer
closed bool
Ctx interface{} // anything goes, server won't touch this
}
// Flush the write buffer. Called automatically after every redis command
func (c *Peer) Flush() {
c.w.Flush()
}
// Close the client connection after the current command is done.
func (c *Peer) Close() {
c.closed = true
}
// WriteError writes a redis 'Error'
func (c *Peer) WriteError(e string) {
fmt.Fprintf(c.w, "-%s\r\n", e)
}
// WriteInline writes a redis inline string
func (c *Peer) WriteInline(s string) {
fmt.Fprintf(c.w, "+%s\r\n", s)
}
// WriteOK write the inline string `OK`
func (c *Peer) WriteOK() {
c.WriteInline("OK")
}
// WriteBulk writes a bulk string
func (c *Peer) WriteBulk(s string) {
fmt.Fprintf(c.w, "$%d\r\n%s\r\n", len(s), s)
}
// WriteNull writes a redis Null element
func (c *Peer) WriteNull() {
fmt.Fprintf(c.w, "$-1\r\n")
}
// WriteLen starts an array with the given length
func (c *Peer) WriteLen(n int) {
fmt.Fprintf(c.w, "*%d\r\n", n)
}
// WriteInt writes an integer
func (c *Peer) WriteInt(i int) {
fmt.Fprintf(c.w, ":%d\r\n", i)
}
|