// Read a multi-bulk request from a Redis client
//
// This function is similar in implementation to that of gedis.Read,
// however a Redis client can only send multi-bulk requests to a Redis
// server, so a simplified version is implemented for reading Redis
// commands from clients.
//
// In truth they can also send an inline request, however that is
// currently not covered by this implementation.
func Read(r gedis.Reader) (res [][]byte, err error) {
var b byte
b, err = readByte(r)
if err != nil {
return
}
if b != '*' {
return res, gedis.NewParseError("Invalid first character")
} else {
n, err := gedis.ReadNumber(r)
if err != nil {
return res, err
}
res = make([][]byte, n)
for i := int64(0); i < n; i++ {
res[i], err = readBulk(r)
if err != nil {
return res, err
}
}
}
return res, err
}
// Read a bulk as defined in the Redis protocol
//
// This functon is similar to that of gedis.ReadBulk, however given
// that a Redis client can only send a multi-bulk requests that only
// include non-nil bulks of bytes, a simplified version that returns a
// sequence of bytes is provided.
func readBulk(r gedis.Reader) (bs []byte, err error) {
var b byte
b, err = readByte(r)
if err != nil {
return bs, err
} else if b != '$' {
return bs, gedis.NewParseError("Invalid first character")
}
n, err := gedis.ReadNumber(r)
if err != nil {
return bs, err
}
bs = make([]byte, n)
_, err = r.Read(bs)
if err != nil {
return bs, err
}
crlf := make([]byte, 2)
if _, err = r.Read(crlf); err != nil {
return bs, err
}
if crlf[0] != '\r' || crlf[1] != '\n' {
return bs, gedis.NewParseError("Invalid EOL")
}
return
}