/
redis.go
371 lines (344 loc) · 9.12 KB
/
redis.go
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package fake
import (
"bufio"
"bytes"
"fmt"
"io"
"net"
"reflect"
"strconv"
"strings"
"sync"
"testing"
)
// RedisServer Fake Redis Server struct
type RedisServer struct {
sync.Mutex
Ln net.Listener
Responses map[string][]interface{}
test *testing.T
}
// NewRedisServer returns new Fake RedisServer instance
func NewRedisServer(t *testing.T) *RedisServer {
ln, err := net.Listen("tcp", "localhost:0")
if err != nil {
t.Fatal("Unable to create a FakeRedisServer, err:", err)
return nil
}
var srv = &RedisServer{
Responses: make(map[string][]interface{}),
Ln: ln,
test: t,
}
go srv.handleConnection()
return srv
}
// Close possible ressources
func (r *RedisServer) Close() {
r.Ln.Close()
}
// GetHostPort return the host port of redis server
func (r *RedisServer) GetHostPort() string {
return r.Ln.Addr().String()
}
func (r *RedisServer) popResponse(rq string) (interface{}, bool) {
r.Lock()
defer r.Unlock()
list, ok := r.Responses[rq]
if ok {
if len(list) != 0 {
val, newlist := list[0], list[1:]
r.Responses[rq] = newlist
return val, true
}
}
return fmt.Errorf("fake.RedisNode: cannot map request '%s' to registered response", rq), false
}
// PushResponse add a response to a specific request
func (r *RedisServer) PushResponse(rq string, response interface{}) {
r.Lock()
defer r.Unlock()
list, ok := r.Responses[rq]
if !ok {
list = []interface{}{}
}
r.Responses[rq] = append(list, response)
}
func (r *RedisServer) handleConnection() {
buf := make([]byte, 4096)
for {
conn, err := r.Ln.Accept()
if err != nil {
if opErr, ok := err.(*net.OpError); ok && opErr.Timeout() {
continue
} else {
break
}
}
defer conn.Close()
var wait sync.WaitGroup
wait.Add(1)
go func(conn net.Conn, wait *sync.WaitGroup) {
for {
// TODO handle buffer full case
n, err := conn.Read(buf)
if err != nil || n == 0 {
break
}
rqs := cleanCommand(buf[0:n])
for _, rq := range rqs {
resp, _ := r.popResponse(rq)
if err = writeResponse(resp, conn); err != nil || n == 0 {
break
}
}
}
wait.Done()
}(conn, &wait)
wait.Wait()
}
}
// does not handle arrays of arrays
func cleanCommand(buf []byte) []string {
commands := []string{}
sliceCommand := []string{}
reader := bytes.NewReader(buf)
scanner := bufio.NewScanner(reader)
scanner.Split(bufio.ScanLines)
for scanner.Scan() {
if strings.HasPrefix(scanner.Text(), "*") {
if len(sliceCommand) != 0 {
// new command starting
commands = append(commands, strings.Join(sliceCommand, " "))
sliceCommand = []string{}
}
continue
}
if strings.HasPrefix(scanner.Text(), "$") {
// next string size
continue
}
// else string
sliceCommand = append(sliceCommand, scanner.Text())
}
commands = append(commands, strings.Join(sliceCommand, " "))
return commands
}
func writeResponse(response interface{}, conn io.Writer) error {
writeBuf := bytes.NewBuffer(make([]byte, 0, 128))
writeScratch := make([]byte, 0, 128)
if _, err := writeTo(writeBuf, writeScratch, response, false); err != nil {
return err
}
if _, err := writeBuf.WriteTo(conn); err != nil {
return err
}
return nil
}
var (
delim = []byte{'\r', '\n'}
errPrefix = []byte{'-'}
intPrefix = []byte{':'}
bulkStrPrefix = []byte{'$'}
arrayPrefix = []byte{'*'}
nilFormatted = []byte("$-1\r\n")
)
func writeArrayHeader(w io.Writer, buf []byte, l int64) (int64, error) {
buf = strconv.AppendInt(buf[:0], l, 10)
var err error
var written int64
written, err = writeBytesHelper(w, arrayPrefix, written, err)
written, err = writeBytesHelper(w, buf, written, err)
written, err = writeBytesHelper(w, delim, written, err)
return written, err
}
func writeBytesHelper(w io.Writer, b []byte, lastWritten int64, lastErr error) (int64, error) {
if lastErr != nil {
return lastWritten, lastErr
}
i, err := w.Write(b)
return int64(i) + lastWritten, err
}
// takes in something, m, and encodes it and writes it to w. buf is used as a
// pre-alloated byte buffer for encoding integers (expected to have a length of
// 0), so we don't have to re-allocate a new one every time we convert an
// integer to a string.
// noArrayHeader means don't write out the headers to any arrays, just
// inline all the elements in the array
func writeTo(w io.Writer, buf []byte, m interface{}, noArrayHeader bool) (int64, error) {
//fmt.Printf("%T\n", m)
switch mt := m.(type) {
case []byte:
return writeStr(w, buf, mt)
case string:
var sbuf []byte
sbuf, buf = stringSlicer(buf, mt)
return writeStr(w, buf, sbuf)
case bool:
buf = buf[:0]
if mt {
buf = append(buf, '1')
} else {
buf = append(buf, '0')
}
return writeStr(w, buf[1:], buf[:1])
case nil:
return writeNil(w)
case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
i := anyIntToInt64(mt)
return writeInt(w, buf, i)
case float32:
return writeFloat(w, buf, float64(mt), 32)
case float64:
return writeFloat(w, buf, mt, 64)
case error:
return writeErr(w, buf, mt)
// specific structs that cannot be represented with simple combinations of other types
case ClusterSlotsSlot:
l := 2 + len(mt.Nodes)
var totalWritten int64
if !noArrayHeader {
written, err := writeArrayHeader(w, buf, int64(l))
totalWritten += written
if err != nil {
return totalWritten, err
}
}
written, err := writeTo(w, buf, mt.Min, noArrayHeader)
totalWritten += written
if err != nil {
return totalWritten, err
}
written, err = writeTo(w, buf, mt.Max, noArrayHeader)
totalWritten += written
if err != nil {
return totalWritten, err
}
for _, node := range mt.Nodes {
written, err = writeTo(w, buf, node, noArrayHeader)
totalWritten += written
if err != nil {
return totalWritten, err
}
}
return totalWritten, nil
default:
// Fallback to reflect-based.
switch reflect.TypeOf(m).Kind() {
case reflect.Slice:
rm := reflect.ValueOf(mt)
l := rm.Len()
var totalWritten, written int64
var err error
if !noArrayHeader {
written, err = writeArrayHeader(w, buf, int64(l))
totalWritten += written
if err != nil {
return totalWritten, err
}
}
for i := 0; i < l; i++ {
vv := rm.Index(i).Interface()
written, err = writeTo(w, buf, vv, noArrayHeader)
totalWritten += written
if err != nil {
return totalWritten, err
}
}
return totalWritten, nil
case reflect.Struct:
rm := reflect.ValueOf(mt)
l := rm.NumField()
var totalWritten, written int64
var err error
if (l != 1) && !noArrayHeader {
written, err = writeArrayHeader(w, buf, int64(l))
totalWritten += written
if err != nil {
return totalWritten, err
}
}
for i := 0; i < rm.NumField(); i++ {
vv := rm.Field(i).Interface()
written, err = writeTo(w, buf, vv, noArrayHeader)
totalWritten += written
if err != nil {
return totalWritten, err
}
}
return totalWritten, nil
default:
return writeStr(w, buf, []byte(fmt.Sprint(m)))
}
}
}
func writeStr(w io.Writer, buf, b []byte) (int64, error) {
var err error
var written int64
buf = strconv.AppendInt(buf[:0], int64(len(b)), 10)
written, err = writeBytesHelper(w, bulkStrPrefix, written, err)
written, err = writeBytesHelper(w, buf, written, err)
written, err = writeBytesHelper(w, delim, written, err)
written, err = writeBytesHelper(w, b, written, err)
written, err = writeBytesHelper(w, delim, written, err)
return written, err
}
func writeErr(w io.Writer, buf []byte, ierr error) (int64, error) {
var err error
var written int64
written, err = writeBytesHelper(w, errPrefix, written, err)
written, err = writeBytesHelper(w, []byte(ierr.Error()), written, err)
written, err = writeBytesHelper(w, delim, written, err)
return written, err
}
func writeInt(
w io.Writer, buf []byte, i int64) (int64, error) {
buf = strconv.AppendInt(buf[:0], i, 10)
var err error
var written int64
written, err = writeBytesHelper(w, intPrefix, written, err)
written, err = writeBytesHelper(w, buf, written, err)
written, err = writeBytesHelper(w, delim, written, err)
return written, err
}
func writeFloat(w io.Writer, buf []byte, f float64, bits int) (int64, error) {
buf = strconv.AppendFloat(buf[:0], f, 'f', -1, bits)
return writeStr(w, buf[len(buf):], buf)
}
func writeNil(w io.Writer) (int64, error) {
written, err := w.Write(nilFormatted)
return int64(written), err
}
// Given a preallocated byte buffer and a string, this will copy the string's
// contents into buf starting at index 0, and returns two slices from buf: The
// first is a slice of the string data, the second is a slice of the "rest" of
// buf following the first slice
func stringSlicer(buf []byte, s string) ([]byte, []byte) {
sbuf := append(buf[:0], s...)
return sbuf, sbuf[len(sbuf):]
}
func anyIntToInt64(m interface{}) int64 {
switch mt := m.(type) {
case int:
return int64(mt)
case int8:
return int64(mt)
case int16:
return int64(mt)
case int32:
return int64(mt)
case int64:
return mt
case uint:
return int64(mt)
case uint8:
return int64(mt)
case uint16:
return int64(mt)
case uint32:
return int64(mt)
case uint64:
return int64(mt)
}
panic(fmt.Sprintf("anyIntToInt64 got bad arg: %#v", m))
}