diff options
Diffstat (limited to 'Godeps/_workspace/src/gopkg.in/redis.v2/parser.go')
| -rw-r--r-- | Godeps/_workspace/src/gopkg.in/redis.v2/parser.go | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/gopkg.in/redis.v2/parser.go b/Godeps/_workspace/src/gopkg.in/redis.v2/parser.go new file mode 100644 index 000000000..b4c380c76 --- /dev/null +++ b/Godeps/_workspace/src/gopkg.in/redis.v2/parser.go @@ -0,0 +1,262 @@ +package redis + +import ( + "errors" + "fmt" + "strconv" + + "gopkg.in/bufio.v1" +) + +type multiBulkParser func(rd *bufio.Reader, n int64) (interface{}, error) + +var ( + errReaderTooSmall = errors.New("redis: reader is too small") +) + +//------------------------------------------------------------------------------ + +func appendArgs(buf []byte, args []string) []byte { + buf = append(buf, '*') + buf = strconv.AppendUint(buf, uint64(len(args)), 10) + buf = append(buf, '\r', '\n') + for _, arg := range args { + buf = append(buf, '$') + buf = strconv.AppendUint(buf, uint64(len(arg)), 10) + buf = append(buf, '\r', '\n') + buf = append(buf, arg...) + buf = append(buf, '\r', '\n') + } + return buf +} + +//------------------------------------------------------------------------------ + +func readLine(rd *bufio.Reader) ([]byte, error) { + line, isPrefix, err := rd.ReadLine() + if err != nil { + return line, err + } + if isPrefix { + return line, errReaderTooSmall + } + return line, nil +} + +func readN(rd *bufio.Reader, n int) ([]byte, error) { + b, err := rd.ReadN(n) + if err == bufio.ErrBufferFull { + tmp := make([]byte, n) + r := copy(tmp, b) + b = tmp + + for { + nn, err := rd.Read(b[r:]) + r += nn + if r >= n { + // Ignore error if we read enough. + break + } + if err != nil { + return nil, err + } + } + } else if err != nil { + return nil, err + } + return b, nil +} + +//------------------------------------------------------------------------------ + +func parseReq(rd *bufio.Reader) ([]string, error) { + line, err := readLine(rd) + if err != nil { + return nil, err + } + + if line[0] != '*' { + return []string{string(line)}, nil + } + numReplies, err := strconv.ParseInt(string(line[1:]), 10, 64) + if err != nil { + return nil, err + } + + args := make([]string, 0, numReplies) + for i := int64(0); i < numReplies; i++ { + line, err = readLine(rd) + if err != nil { + return nil, err + } + if line[0] != '$' { + return nil, fmt.Errorf("redis: expected '$', but got %q", line) + } + + argLen, err := strconv.ParseInt(string(line[1:]), 10, 32) + if err != nil { + return nil, err + } + + arg, err := readN(rd, int(argLen)+2) + if err != nil { + return nil, err + } + args = append(args, string(arg[:argLen])) + } + return args, nil +} + +//------------------------------------------------------------------------------ + +func parseReply(rd *bufio.Reader, p multiBulkParser) (interface{}, error) { + line, err := readLine(rd) + if err != nil { + return nil, err + } + + switch line[0] { + case '-': + return nil, errorf(string(line[1:])) + case '+': + return string(line[1:]), nil + case ':': + v, err := strconv.ParseInt(string(line[1:]), 10, 64) + if err != nil { + return nil, err + } + return v, nil + case '$': + if len(line) == 3 && line[1] == '-' && line[2] == '1' { + return nil, Nil + } + + replyLen, err := strconv.Atoi(string(line[1:])) + if err != nil { + return nil, err + } + + b, err := readN(rd, replyLen+2) + if err != nil { + return nil, err + } + return string(b[:replyLen]), nil + case '*': + if len(line) == 3 && line[1] == '-' && line[2] == '1' { + return nil, Nil + } + + repliesNum, err := strconv.ParseInt(string(line[1:]), 10, 64) + if err != nil { + return nil, err + } + + return p(rd, repliesNum) + } + return nil, fmt.Errorf("redis: can't parse %q", line) +} + +func parseSlice(rd *bufio.Reader, n int64) (interface{}, error) { + vals := make([]interface{}, 0, n) + for i := int64(0); i < n; i++ { + v, err := parseReply(rd, parseSlice) + if err == Nil { + vals = append(vals, nil) + } else if err != nil { + return nil, err + } else { + vals = append(vals, v) + } + } + return vals, nil +} + +func parseStringSlice(rd *bufio.Reader, n int64) (interface{}, error) { + vals := make([]string, 0, n) + for i := int64(0); i < n; i++ { + viface, err := parseReply(rd, nil) + if err != nil { + return nil, err + } + v, ok := viface.(string) + if !ok { + return nil, fmt.Errorf("got %T, expected string", viface) + } + vals = append(vals, v) + } + return vals, nil +} + +func parseBoolSlice(rd *bufio.Reader, n int64) (interface{}, error) { + vals := make([]bool, 0, n) + for i := int64(0); i < n; i++ { + viface, err := parseReply(rd, nil) + if err != nil { + return nil, err + } + v, ok := viface.(int64) + if !ok { + return nil, fmt.Errorf("got %T, expected int64", viface) + } + vals = append(vals, v == 1) + } + return vals, nil +} + +func parseStringStringMap(rd *bufio.Reader, n int64) (interface{}, error) { + m := make(map[string]string, n/2) + for i := int64(0); i < n; i += 2 { + keyiface, err := parseReply(rd, nil) + if err != nil { + return nil, err + } + key, ok := keyiface.(string) + if !ok { + return nil, fmt.Errorf("got %T, expected string", keyiface) + } + + valueiface, err := parseReply(rd, nil) + if err != nil { + return nil, err + } + value, ok := valueiface.(string) + if !ok { + return nil, fmt.Errorf("got %T, expected string", valueiface) + } + + m[key] = value + } + return m, nil +} + +func parseZSlice(rd *bufio.Reader, n int64) (interface{}, error) { + zz := make([]Z, n/2) + for i := int64(0); i < n; i += 2 { + z := &zz[i/2] + + memberiface, err := parseReply(rd, nil) + if err != nil { + return nil, err + } + member, ok := memberiface.(string) + if !ok { + return nil, fmt.Errorf("got %T, expected string", memberiface) + } + z.Member = member + + scoreiface, err := parseReply(rd, nil) + if err != nil { + return nil, err + } + scorestr, ok := scoreiface.(string) + if !ok { + return nil, fmt.Errorf("got %T, expected string", scoreiface) + } + score, err := strconv.ParseFloat(scorestr, 64) + if err != nil { + return nil, err + } + z.Score = score + } + return zz, nil +} |