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|
use std::sync::Mutex;
use rustler::{resource::ResourceArc, NifResult, NifRecord, NifUntaggedEnum,
Encoder, Env, Term, types::tuple::make_tuple};
mod tree_bitmap;
use tree_bitmap::TreeBitmap;
struct TableResource {
pub tree: Mutex<TreeBitmap<u32>>
}
mod atoms {
rustler::atoms! {
ok,
nil,
error
}
}
trait Address {
fn nibbles(self) -> Nibbles;
fn mask(self, masklen: u32) -> Self;
}
#[derive(NifUntaggedEnum, Clone)]
enum AddrTuple {
V4(TupleV4),
V6(TupleV6)
}
impl Address for AddrTuple {
fn nibbles(self) -> Nibbles {
match self {
AddrTuple::V4(tuple_v4) => tuple_v4.nibbles(),
AddrTuple::V6(tuple_v6) => tuple_v6.nibbles()
}
}
fn mask(self, masklen: u32) -> Self {
match self {
AddrTuple::V4(tuple_v4) => AddrTuple::V4(tuple_v4.mask(masklen)),
AddrTuple::V6(tuple_v6) => AddrTuple::V6(tuple_v6.mask(masklen))
}
}
}
#[derive(Debug, NifRecord, Clone)]
#[tag = "inet4"]
struct TupleV4 {
pub a: u8,
pub b: u8,
pub c: u8,
pub d: u8
}
enum Nibbles {
V4([u8; 8]),
V6([u8; 32])
}
impl TupleV4 {
pub fn new(a1: u8, a2: u8, a3: u8, a4: u8) -> Self {
TupleV4 { a: a1, b: a2, c: a3, d: a4 }
}
pub fn from(num: u32) -> Self {
TupleV4 {
a: (num >> 24) as u8,
b: (num >> 16) as u8,
c: (num >> 8) as u8,
d: num as u8,
}
}
}
impl Address for TupleV4 {
fn nibbles(self) -> Nibbles {
let mut ret: [u8; 8] = [0; 8];
let bytes: [u8; 4] = [self.a, self.b, self.c, self.d];
for (i, byte) in bytes.iter().enumerate() {
ret[i * 2] = byte >> 4;
ret[i * 2 + 1] = byte & 0xf;
}
Nibbles::V4(ret)
}
fn mask(self, masklen: u32) -> Self {
debug_assert!(masklen <= 32);
let ip = u32::from(self);
let masked = match masklen {
0 => 0,
n => ip & (!0 << (32 - n)),
};
TupleV4::from(masked)
}
}
impl ::std::convert::From<TupleV4> for u32 {
fn from(a: TupleV4) -> u32 {
(a.a as u32) << 24
| (a.b as u32) << 16
| (a.c as u32) << 8
| (a.d as u32) << 0
}
}
#[derive(Debug, NifRecord, Clone)]
#[tag = "inet6"]
struct TupleV6 {
pub a1: u16,
pub a2: u16,
pub a3: u16,
pub a4: u16,
pub a5: u16,
pub a6: u16,
pub a7: u16,
pub a8: u16
}
impl TupleV6 {
fn new(a1: u16, a2: u16, a3: u16, a4: u16, a5: u16, a6: u16, a7: u16, a8: u16) -> Self {
TupleV6 { a1: a1, a2, a3: a3, a4: a4, a5: a5, a6: a6, a7: a7, a8: a8 }
}
fn octets(self) -> [u8; 16] {
[
(self.a1 >> 8) as u8,
self.a1 as u8,
(self.a2 >> 8) as u8,
self.a2 as u8,
(self.a3 >> 8) as u8,
self.a3 as u8,
(self.a4 >> 8) as u8,
self.a4 as u8,
(self.a5 >> 8) as u8,
self.a5 as u8,
(self.a6 >> 8) as u8,
self.a6 as u8,
(self.a7 >> 8) as u8,
self.a7 as u8,
(self.a8 >> 8) as u8,
self.a8 as u8
]
}
fn segments(self) -> [u16; 8] {
let bytes = self.octets();
[
(bytes[0] as u16) << 8 | (bytes[1] as u16),
(bytes[2] as u16) << 8 | (bytes[3] as u16),
(bytes[4] as u16) << 8 | (bytes[5] as u16),
(bytes[6] as u16) << 8 | (bytes[7] as u16),
(bytes[8] as u16) << 8 | (bytes[9] as u16),
(bytes[10] as u16) << 8 | (bytes[11] as u16),
(bytes[12] as u16) << 8 | (bytes[13] as u16),
(bytes[14] as u16) << 8 | (bytes[15] as u16),
]
}
}
impl Address for TupleV6 {
fn nibbles(self) -> Nibbles {
let mut ret: [u8; 32] = [0; 32];
let bytes = self.octets();
for (i, byte) in bytes.iter().enumerate() {
ret[i * 2] = byte >> 4;
ret[i * 2 + 1] = byte & 0xf;
}
Nibbles::V6(ret)
}
fn mask(self, masklen: u32) -> Self {
debug_assert!(masklen <= 128);
let mut ret = self.segments();
for i in ((masklen + 15) / 16)..8 {
ret[i as usize] = 0;
}
if masklen % 16 != 0 {
ret[masklen as usize / 16] &= !0 << (16 - (masklen % 16));
}
Self::new(
ret[0], ret[1], ret[2], ret[3], ret[4], ret[5], ret[6], ret[7],
)
}
}
#[rustler::nif]
fn new() -> NifResult<ResourceArc<TableResource>> {
let tree = TreeBitmap::new();
let resource = ResourceArc::new(TableResource {
tree: Mutex::new(tree)
});
Ok(resource)
}
#[rustler::nif]
fn new_with_capacity(n: usize) -> NifResult<ResourceArc<TableResource>> {
let tree = TreeBitmap::with_capacity(n);
let resource = ResourceArc::new(TableResource {
tree: Mutex::new(tree)
});
Ok(resource)
}
#[rustler::nif]
fn length(table_resource: ResourceArc<TableResource>) -> NifResult<usize> {
let tree = table_resource.tree.lock().unwrap();
Ok(tree.len())
}
#[rustler::nif]
fn add<'a>(
env: Env<'a>,
table_resource: ResourceArc<TableResource>,
ip: AddrTuple,
masklen: u32,
value: u32
) -> Term {
let mut tree = table_resource.tree.lock().unwrap();
let result = match ip.nibbles() {
Nibbles::V4(nibbles) => tree.insert(&nibbles.as_ref(), masklen, value),
Nibbles::V6(nibbles) => tree.insert(&nibbles.as_ref(), masklen, value)
};
if let Some(value) = result {
make_tuple(env, &[atoms::ok().encode(env), value.encode(env)])
} else {
make_tuple(env, &[atoms::ok().encode(env), atoms::nil().encode(env)])
}
}
#[rustler::nif]
fn remove<'a>(
env: Env<'a>,
table_resource: ResourceArc<TableResource>,
ip: AddrTuple,
masklen: u32
) -> Term {
let mut tree = table_resource.tree.lock().unwrap();
let result = match ip.nibbles() {
Nibbles::V4(nibbles) => tree.remove(&nibbles.as_ref(), masklen),
Nibbles::V6(nibbles) => tree.remove(&nibbles.as_ref(), masklen),
};
if let Some(value) = result {
make_tuple(env, &[atoms::ok().encode(env), value.encode(env)])
} else {
make_tuple(env, &[atoms::ok().encode(env), atoms::nil().encode(env)])
}
}
#[rustler::nif]
fn longest_match<'a>(
env: Env<'a>,
table_resource: ResourceArc<TableResource>,
ip: AddrTuple
) -> Term {
let tree = table_resource.tree.lock().unwrap();
let ip2 = ip.clone();
let result = match ip2.nibbles() {
Nibbles::V4(nibbles) => tree.longest_match(&nibbles.as_ref()),
Nibbles::V6(nibbles) => tree.longest_match(&nibbles.as_ref())
};
if let Some((bits_matched, value)) = result {
let prefix = ip.mask(bits_matched);
make_tuple(env, &[atoms::ok().encode(env), prefix.encode(env), bits_matched.encode(env), value.encode(env)])
} else {
make_tuple(env, &[atoms::ok().encode(env), atoms::nil().encode(env)])
}
}
#[rustler::nif]
fn exact_match<'a>(
env: Env<'a>,
table_resource: ResourceArc<TableResource>,
ip: AddrTuple,
masklen: u32
) -> Term {
let tree = table_resource.tree.lock().unwrap();
let ip2 = ip.clone();
let result = match ip2.nibbles() {
Nibbles::V4(nibbles) => tree.exact_match(&nibbles.as_ref(), masklen),
Nibbles::V6(nibbles) => tree.exact_match(&nibbles.as_ref(), masklen)
};
if let Some(value) = result {
make_tuple(env, &[atoms::ok().encode(env), value.encode(env)])
} else {
make_tuple(env, &[atoms::ok().encode(env), atoms::nil().encode(env)])
}
}
#[rustler::nif]
fn memory<'a>(
env: Env<'a>,
table_resource: ResourceArc<TableResource>
) -> Term {
let tree = table_resource.tree.lock().unwrap();
let (nodes, results) = tree.mem_usage();
make_tuple(env, &[nodes.encode(env), results.encode(env)])
}
rustler::init!("Elixir.TreeBitmap.NIF",
[new,
new_with_capacity,
length,
add,
remove,
longest_match,
exact_match,
memory],
load = on_load);
fn on_load(env: Env, _info: Term) -> bool {
rustler::resource!(TableResource, env);
true
}
|
