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multibulk_command.go
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/
multibulk_command.go
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/*
* Copyright (c) 2015, Salesforce.com, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this list of conditions and the following
* disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided with the distribution.
*
* * Neither the name of Salesforce.com nor the names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package protocol
import (
"bytes"
)
var NIL_STRING []byte = nil
type MultibulkCommand struct {
Buffer []byte
Command []byte
// Usually denotes the key
FirstArg []byte
ArgCount int
}
func ParseMultibulkCommand(b []byte) (*MultibulkCommand, error) {
c := &MultibulkCommand{}
c.Buffer = make([]byte, len(b))
copy(c.Buffer, b)
if c.Buffer[0] != '*' {
return nil, ERROR_COMMAND_PARSE
}
newlinePos := bytes.Index(c.Buffer, REDIS_NEWLINE)
if newlinePos < 0 {
return nil, ERROR_COMMAND_PARSE
}
count, err := ParseInt(c.Buffer[1:newlinePos])
if err != nil {
return nil, err
}
if count > 0 {
c.ArgCount = count - 1
}
cBuf := c.Buffer[newlinePos+2:]
for i := 0; i < 2 && i < count; i++ {
if cBuf[0] != '$' {
return nil, ERROR_COMMAND_PARSE
}
newlinePos := bytes.Index(cBuf, REDIS_NEWLINE)
if newlinePos < 0 {
return nil, ERROR_COMMAND_PARSE
}
count, err := ParseInt(cBuf[1:newlinePos])
if err != nil {
return nil, err
} else if count < 0 {
cBuf = cBuf[newlinePos+2:]
continue
}
if i == 0 {
c.Command = cBuf[newlinePos+2 : newlinePos+2+count]
} else {
c.FirstArg = cBuf[newlinePos+2 : newlinePos+2+count]
}
cBuf = cBuf[newlinePos+2+count+2:]
}
for i := 0; i < len(c.Command); i++ {
if char := c.Command[i]; char >= 'A' && char <= 'Z' {
c.Command[i] = c.Command[i] + 0x20
}
}
return c, nil
}
// Satisfy Command Interface
func (this *MultibulkCommand) GetCommand() []byte {
return this.Command
}
func (this *MultibulkCommand) GetBuffer() []byte {
return this.Buffer
}
func (this *MultibulkCommand) GetFirstArg() []byte {
return this.FirstArg
}
func (this *MultibulkCommand) GetArgCount() int {
return this.ArgCount
}