mirror of https://github.com/tidwall/tile38.git
302 lines
7.4 KiB
Go
302 lines
7.4 KiB
Go
package server
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import (
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"crypto/sha1"
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"encoding/base64"
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"errors"
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"io"
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"net/url"
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"strconv"
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"strings"
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"github.com/tidwall/redcon"
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"github.com/tidwall/resp"
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)
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var errInvalidHTTP = errors.New("invalid HTTP request")
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// Type is resp type
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type Type int
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const (
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Null Type = iota
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RESP
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Telnet
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Native
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HTTP
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WebSocket
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JSON
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)
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// Message is a resp message
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type Message struct {
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Command string
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Values []resp.Value
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ConnType Type
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OutputType Type
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Auth string
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}
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// PipelineReader ...
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type PipelineReader struct {
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rd io.Reader
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wr io.Writer
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packet [0xFFFF]byte
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buf []byte
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}
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const kindHTTP redcon.Kind = 9999
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// NewPipelineReader ...
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func NewPipelineReader(rd io.ReadWriter) *PipelineReader {
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return &PipelineReader{rd: rd, wr: rd}
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}
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func readcrlfline(packet []byte) (line string, leftover []byte, ok bool) {
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for i := 1; i < len(packet); i++ {
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if packet[i] == '\n' && packet[i-1] == '\r' {
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return string(packet[:i-1]), packet[i+1:], true
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}
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}
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return "", packet, false
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}
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func readNextHTTPCommand(packet []byte, argsIn [][]byte, msg *Message, wr io.Writer) (
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complete bool, args [][]byte, kind redcon.Kind, leftover []byte, err error,
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) {
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args = argsIn[:0]
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msg.ConnType = HTTP
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msg.OutputType = JSON
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opacket := packet
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ready, err := func() (bool, error) {
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var line string
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var ok bool
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// read header
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var headers []string
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for {
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line, packet, ok = readcrlfline(packet)
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if !ok {
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return false, nil
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}
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if line == "" {
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break
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}
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headers = append(headers, line)
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}
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parts := strings.Split(headers[0], " ")
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if len(parts) != 3 {
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return false, errInvalidHTTP
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}
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method := parts[0]
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path := parts[1]
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if len(path) == 0 || path[0] != '/' {
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return false, errInvalidHTTP
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}
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path, err = url.QueryUnescape(path[1:])
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if err != nil {
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return false, errInvalidHTTP
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}
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if method != "GET" && method != "POST" {
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return false, errInvalidHTTP
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}
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contentLength := 0
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websocket := false
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websocketVersion := 0
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websocketKey := ""
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for _, header := range headers[1:] {
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if header[0] == 'a' || header[0] == 'A' {
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if strings.HasPrefix(strings.ToLower(header), "authorization:") {
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msg.Auth = strings.TrimSpace(header[len("authorization:"):])
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}
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} else if header[0] == 'u' || header[0] == 'U' {
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if strings.HasPrefix(strings.ToLower(header), "upgrade:") && strings.ToLower(strings.TrimSpace(header[len("upgrade:"):])) == "websocket" {
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websocket = true
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}
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} else if header[0] == 's' || header[0] == 'S' {
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if strings.HasPrefix(strings.ToLower(header), "sec-websocket-version:") {
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var n uint64
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n, err = strconv.ParseUint(strings.TrimSpace(header[len("sec-websocket-version:"):]), 10, 64)
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if err != nil {
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return false, err
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}
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websocketVersion = int(n)
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} else if strings.HasPrefix(strings.ToLower(header), "sec-websocket-key:") {
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websocketKey = strings.TrimSpace(header[len("sec-websocket-key:"):])
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}
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} else if header[0] == 'c' || header[0] == 'C' {
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if strings.HasPrefix(strings.ToLower(header), "content-length:") {
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var n uint64
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n, err = strconv.ParseUint(strings.TrimSpace(header[len("content-length:"):]), 10, 64)
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if err != nil {
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return false, err
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}
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contentLength = int(n)
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}
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}
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}
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if websocket && websocketVersion >= 13 && websocketKey != "" {
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msg.ConnType = WebSocket
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if wr == nil {
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return false, errors.New("connection is nil")
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}
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sum := sha1.Sum([]byte(websocketKey + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"))
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accept := base64.StdEncoding.EncodeToString(sum[:])
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wshead := "HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: " + accept + "\r\n\r\n"
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if _, err = wr.Write([]byte(wshead)); err != nil {
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println(4)
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return false, err
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}
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} else if contentLength > 0 {
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msg.ConnType = HTTP
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if len(packet) < contentLength {
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return false, nil
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}
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path += string(packet[:contentLength])
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packet = packet[contentLength:]
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}
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if path == "" {
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return true, nil
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}
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nmsg, err := readNativeMessageLine([]byte(path))
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if err != nil {
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return false, err
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}
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msg.OutputType = JSON
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msg.Values = nmsg.Values
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msg.Command = commandValues(nmsg.Values)
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return true, nil
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}()
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if err != nil || !ready {
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return false, args[:0], kindHTTP, opacket, err
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}
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return true, args[:0], kindHTTP, packet, nil
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}
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func readNextCommand(packet []byte, argsIn [][]byte, msg *Message, wr io.Writer) (
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complete bool, args [][]byte, kind redcon.Kind, leftover []byte, err error,
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) {
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if packet[0] == 'G' || packet[0] == 'P' {
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// could be an HTTP request
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var line []byte
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for i := 1; i < len(packet); i++ {
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if packet[i] == '\n' {
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if packet[i-1] == '\r' {
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line = packet[:i+1]
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break
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}
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}
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}
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if len(line) == 0 {
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return false, argsIn[:0], redcon.Redis, packet, nil
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}
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if len(line) > 11 && string(line[len(line)-11:len(line)-5]) == " HTTP/" {
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return readNextHTTPCommand(packet, argsIn, msg, wr)
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}
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}
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return redcon.ReadNextCommand(packet, args)
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}
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// ReadMessages ...
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func (rd *PipelineReader) ReadMessages() ([]*Message, error) {
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var msgs []*Message
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moreData:
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n, err := rd.rd.Read(rd.packet[:])
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if err != nil {
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return nil, err
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}
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if n == 0 {
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// need more data
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goto moreData
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}
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data := rd.packet[:n]
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if len(rd.buf) > 0 {
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data = append(rd.buf, data...)
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}
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for len(data) > 0 {
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msg := &Message{}
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complete, args, kind, leftover, err := readNextCommand(data, nil, msg, rd.wr)
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if err != nil {
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break
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}
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if !complete {
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break
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}
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if kind != kindHTTP {
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msg.Command = strings.ToLower(string(args[0]))
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for i := 0; i < len(args); i++ {
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msg.Values = append(msg.Values, resp.BytesValue(args[i]))
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}
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switch kind {
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case redcon.Redis:
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msg.ConnType = RESP
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msg.OutputType = RESP
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case redcon.Tile38:
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msg.ConnType = Native
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msg.OutputType = JSON
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case redcon.Telnet:
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msg.ConnType = RESP
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msg.OutputType = RESP
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}
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} else if len(msg.Values) == 0 {
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return nil, errInvalidHTTP
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}
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msgs = append(msgs, msg)
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data = leftover
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}
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if len(data) > 0 {
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rd.buf = append(rd.buf[:0], data...)
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} else if len(rd.buf) > 0 {
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rd.buf = rd.buf[:0]
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}
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if err != nil && len(msgs) == 0 {
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return nil, err
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}
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return msgs, nil
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}
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func readNativeMessageLine(line []byte) (*Message, error) {
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values := make([]resp.Value, 0, 16)
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reading:
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for len(line) != 0 {
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if line[0] == '{' {
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// The native protocol cannot understand json boundaries so it assumes that
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// a json element must be at the end of the line.
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values = append(values, resp.StringValue(string(line)))
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break
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}
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if line[0] == '"' && line[len(line)-1] == '"' {
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if len(values) > 0 &&
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strings.ToLower(values[0].String()) == "set" &&
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strings.ToLower(values[len(values)-1].String()) == "string" {
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// Setting a string value that is contained inside double quotes.
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// This is only because of the boundary issues of the native protocol.
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values = append(values, resp.StringValue(string(line[1:len(line)-1])))
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break
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}
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}
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i := 0
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for ; i < len(line); i++ {
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if line[i] == ' ' {
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value := string(line[:i])
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if value != "" {
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values = append(values, resp.StringValue(value))
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}
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line = line[i+1:]
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continue reading
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}
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}
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values = append(values, resp.StringValue(string(line)))
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break
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}
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return &Message{Command: commandValues(values), Values: values, ConnType: Native, OutputType: JSON}, nil
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}
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func commandValues(values []resp.Value) string {
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if len(values) == 0 {
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return ""
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}
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return strings.ToLower(values[0].String())
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}
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