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parser.go
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parser.go
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package main
import (
"errors"
"strconv"
"strings"
)
func parser(cmd string) (command, error) {
arr := strings.Split(cmd, " ")
c := command{0, "", 0, 0, 0, false, "", nil}
e := errors.New("ERR_CMD_ERR\r\n")
l := len(arr)
switch arr[0] {
case "set":
{
if l != 4 && l != 5 {
return c, e
}
c.action = 0
c.key = arr[1]
exp, e1 := strconv.Atoi(arr[2])
if e1 != nil || exp < 0 {
return c, e
}
c.expiry = int64(exp)
numb, e2 := strconv.Atoi(arr[3])
if e2 != nil || numb < 0 {
return c, e
}
c.numbytes = numb
if l == 5 {
if arr[4] == "noreply" {
c.noreply = true
} else {
return c, e
}
}
return c, nil
}
case "get":
{
if l != 2 {
return c, e
}
c.action = 1
c.key = arr[1]
return c, nil
}
case "getm":
{
if l != 2 {
return c, e
}
c.action = 2
c.key = arr[1]
return c, nil
}
case "cas":
{
if l != 5 && l != 6 {
return c, e
}
c.action = 3
c.key = arr[1]
exp, e1 := strconv.Atoi(arr[2])
if e1 != nil || exp < 0 {
return c, e
}
c.expiry = int64(exp)
ver, e2 := strconv.Atoi(arr[3])
if e2 != nil || ver <= 0 {
return c, e
}
c.version = uint64(ver)
numb, e3 := strconv.Atoi(arr[4])
if e3 != nil || numb < 0 {
return c, e
}
c.numbytes = numb
if l == 6 {
if arr[5] == "noreply" {
c.noreply = true
} else {
return c, e
}
}
return c, nil
}
case "delete":
{
if l != 2 {
return c, e
}
c.action = 4
c.key = arr[1]
return c, nil
}
case "cleanup": // Not specified in syntax, but provides manual cleanup option
{
if l != 1 {
return c, e
}
c.action = 5
return c, nil
}
default:
{
return c, e
}
}
}