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///
/// Some of the Code copied from: https://github.com/tidwall/cache-server
/// Copy right for copied code: Josh Baker @tidwall, MIT License
///
pub struct RedisUtil {}
impl RedisUtil {
#[inline]
pub fn redcon_take_args(input: &[u8], ni: usize) -> (Vec<Vec<u8>>, String, usize, bool) {
if input.len() > ni {
if input[ni] == b'*' {
let (mut args, err, index, complete) = RedisUtil::redcon_take_multibulk_args(input, ni);
if !args.is_empty() {
args[0].make_ascii_uppercase();
}
(args, err, index, complete)
} else {
let (mut args, err, index, complete) = RedisUtil::redcon_take_inline_args(input, ni);
if !args.is_empty() {
args[0].make_ascii_uppercase();
}
(args, err, index, complete)
}
} else {
(Vec::default(), String::default(), ni, false)
}
}
#[inline]
pub fn safe_line_from_string(s: &str) -> String {
RedisUtil::safe_line_from_slice(s.as_bytes())
}
#[inline]
pub fn safe_line_from_slice(s: &[u8]) -> String {
let mut out = Vec::new();
for c in s {
if *c < b' ' {
out.push(b' ')
} else {
out.push(*c);
}
}
String::from_utf8_lossy(out.as_slice()).to_string()
}
pub fn arg_match(arg: &[u8], what: &str) -> bool {
if arg.len() != what.len() {
return false;
}
let what = what.as_bytes();
for i in 0..arg.len() {
if arg[i] != what[i] {
if arg[i] >= b'a' && arg[i] <= b'z' {
if arg[i] != what[i] + 32 {
return false;
}
} else if arg[i] >= b'A' && arg[i] <= b'Z' && arg[i] != what[i] - 32 {
return false;
}
}
}
true
}
#[inline]
pub fn make_bulk(bulk: &[u8]) -> Vec<u8> {
let mut resp = Vec::with_capacity(bulk.len() + 10);
resp.push(b'$');
resp.extend_from_slice(&bulk.len().to_string().into_bytes());
resp.push(b'\r');
resp.push(b'\n');
resp.extend(bulk);
resp.push(b'\r');
resp.push(b'\n');
resp
}
#[inline]
pub fn make_bulk_extend(bulk: Vec<u8>) -> Vec<u8> {
let mut resp = Vec::with_capacity(bulk.len() + 10);
resp.push(b'$');
resp.extend_from_slice(&bulk.len().to_string().into_bytes());
resp.push(b'\r');
resp.push(b'\n');
resp.extend(bulk);
resp.push(b'\r');
resp.push(b'\n');
resp
}
pub fn make_array(count: usize) -> Vec<u8> {
let mut resp = Vec::new();
resp.push(b'*');
if count > 0 {
resp.extend_from_slice(&count.to_string().into_bytes());
} else {
resp.extend_from_slice(b"1\r\n$-1");
}
resp.push(b'\r');
resp.push(b'\n');
resp
}
#[inline]
pub fn invalid_num_args(cmd: &[u8]) -> Vec<u8> {
format!(
"-ERR wrong number of arguments for '{}' command\r\n",
String::from_utf8_lossy(&cmd)
)
.into_bytes()
.to_vec()
}
pub fn redcon_take_multibulk_args(
input: &[u8],
ni: usize,
) -> (Vec<Vec<u8>>, String, usize, bool) {
trace!("redcon_take_multibulk_args()");
let mut err = String::default();
let mut complete = false;
let mut args: Vec<Vec<u8>> = Vec::new();
let mut i = ni + 1;
let mut s = ni;
while i < input.len() {
if input[i - 1] == b'\r' && input[i] == b'\n' {
match String::from_utf8_lossy(&input[s + 1..i - 1]).parse::<usize>() {
Ok(nargs) => {
trace!("nargs:{}", nargs);
i += 1;
complete = nargs == 0;
for ag in 0..nargs {
trace!("ag:{}", ag);
s = i;
while i < input.len() {
if input[i - 1] == b'\r' && input[i] == b'\n' {
//let mut next_index = s;
// this is response status. e.g for subscriber command :0 or :1
let mut response_flag = false;
if input[s] == b':' {
response_flag = true;
} else if input[s] != b'$' {
err = format!("expected '$', got '{}'", input[s] as char);
error!(
"Redis parse error: {}, s:{}, i:{}, ni:{}, nargs:{}, input_len:{}, Payload:{}",
err,
s,
i,
ni,
nargs,
input.len(),
String::from_utf8_lossy(&input[s - 15..])
);
break;
}
//next_index += 1;
match String::from_utf8_lossy(&input[s + 1..i - 1])
.parse::<usize>()
{
Ok(nbytes) => {
trace!("nbytes:{}", nbytes,);
if response_flag {
trace!("response_flag is true");
let bin = input[s + 1..i - 1].to_vec();
let response_status_len = bin.len();
trace!(
"Adding to args: {}",
String::from_utf8_lossy(&bin)
);
i = i + 1 + bin.len() + 2;
args.push(bin);
trace!("args len: {}", response_status_len);
} else {
if input.len() < i + 1 + nbytes + 2 {
trace!(
"Break in input.len() < i + 1 + nbytes + 2. Remaning payload:{}",
String::from_utf8_lossy(&input[s + 1..])
);
return (args, err, i, false);
//break;
}
let bin = input[i + 1..i + 1 + nbytes].to_vec();
trace!(
"Adding to args: {}",
String::from_utf8_lossy(&bin)
);
args.push(bin);
trace!("args len: {}", args.len());
i = i + 1 + nbytes + 2;
}
}
Err(_) => {
err = "invalid bulk length".to_string();
error!("Redis parse error: {}", err);
}
}
break;
}
i += 1;
}
if err != "" {
error!("Redis parse error: {}. Breaking loop", err);
break;
}
if args.len() == nargs {
trace!(
"Complete true: args.len(): {} == nargs: {}",
args.len(),
nargs
);
complete = true;
break;
}
}
}
Err(_) => {
err = "invalid multibulk length".to_string();
error!("Redis parse error: {}", err);
}
}
break;
}
i += 1;
}
if err != "" {
error!("Redis ERR Protocol error: {}", err);
err = format!(
"ERR Protocol error: {}",
RedisUtil::safe_line_from_string(&err)
)
}
trace!(
"Returning args leng:{}, err:{}, i:{}, complete:{}",
args.len(),
err,
i,
complete
);
(args, err, i, complete)
}
pub fn redcon_take_inline_args(
packet: &[u8],
ni: usize,
) -> (Vec<Vec<u8>>, String, usize, bool) {
let mut i = ni;
let mut s = ni;
let mut args: Vec<Vec<u8>> = Vec::new();
while i < packet.len() {
if packet[i] == b' ' || packet[i] == b'\n' {
let ii = if packet[i] == b'\n' && i > s && packet[i - 1] == b'\r' {
i - 1
} else {
i
};
if s != ii {
args.push(packet[s..ii].to_vec());
}
if packet[i] == b'\n' {
return (args, String::default(), i + 1, true);
}
s = i + 1;
} else if packet[i] == b'"' || packet[i] == b'\'' {
let mut arg = Vec::new();
let ch = packet[i];
i += 1;
s = i;
while i < packet.len() {
if packet[i] == b'\n' {
return (
Vec::default(),
"ERR Protocol error: unbalanced quotes in request".to_string(),
ni,
false,
);
} else if packet[i] == b'\\' {
i += 1;
match packet[i] {
b'n' => arg.push(b'\n'),
b'r' => arg.push(b'\r'),
b't' => arg.push(b'\t'),
b'b' => arg.push(0x08),
b'a' => arg.push(0x07),
b'x' => {
let is_hex = |b: u8| -> bool {
(b >= b'0' && b <= b'9')
|| (b >= b'a' && b <= b'f')
|| (b >= b'A' && b <= b'F')
};
let hex_to_digit = |b: u8| -> u8 {
if b <= b'9' {
b - b'0'
} else if b <= b'F' {
b - b'A' + 10
} else {
b - b'a' + 10
}
};
if packet.len() - (i + 1) >= 2
&& is_hex(packet[i + 1])
&& is_hex(packet[i + 2])
{
arg.push(
hex_to_digit(packet[i + 1])
<< (4 + hex_to_digit(packet[i + 2])),
);
i += 2
} else {
arg.push(b'x')
}
}
_ => arg.push(packet[i]),
}
} else if packet[i] == ch {
args.push(arg);
s = i + 1;
break;
} else {
arg.push(packet[i]);
}
i += 1;
}
}
i += 1;
}
(Vec::default(), String::default(), ni, false)
}
}