77 lines
2 KiB
Rust
77 lines
2 KiB
Rust
use domain::{
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base::{
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octets::{ParseError, Parser},
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rdata::{ParseRecordData, UnknownRecordData},
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Message, ParsedDname,
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},
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rdata::AllRecordData,
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};
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use js_sys::{Math, Promise};
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use std::ops::Add;
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use std::{collections::hash_map::DefaultHasher, hash::Hasher};
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use wasm_bindgen::prelude::*;
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use wasm_bindgen::JsValue;
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use wasm_bindgen_futures::JsFuture;
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use web_sys::Request;
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#[wasm_bindgen]
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extern "C" {
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// This binds to the fetch function in global scope
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// In cloudflare workers, there's no Window object
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// and unfortunately the bionding in web_sys depends
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// on Window being present.
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fn fetch(req: &Request) -> Promise;
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}
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pub fn parse_dns_wireformat(msg: &[u8]) -> Result<Message<Vec<u8>>, String> {
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Message::from_octets(msg.to_owned())
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.map_err(|_| "Failed to parse DNS wireformat message".to_string())
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}
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pub fn parse_record_data<T: AsRef<[u8]>>(
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record: &UnknownRecordData<T>,
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) -> Result<Option<AllRecordData<&[u8], ParsedDname<&[u8]>>>, ParseError> {
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AllRecordData::parse_data(
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record.rtype(),
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&mut Parser::from_ref(record.data().as_ref()),
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)
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}
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// Rust wrapper around JS functions
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// For convenience, and also to work around bugs in rust-analyzer
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// which thinks all JS functions are "unsafe"
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#[allow(unused_unsafe)]
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pub async fn fetch_rs(req: &Request) -> Result<JsValue, JsValue> {
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JsFuture::from(unsafe { fetch(req) }).await
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}
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#[allow(unused_unsafe)]
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pub fn random() -> f64 {
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unsafe { Math::random() }
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}
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pub fn random_range<T>(min: T, max: T) -> T
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where
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T: Ord + Into<f64> + FromFloat<f64> + Add<Output = T>,
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{
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min + T::from_float(random() * max.into())
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}
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pub trait FromFloat<F> {
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fn from_float(f: F) -> Self;
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}
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impl FromFloat<f64> for u16 {
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fn from_float(f: f64) -> u16 {
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f as u16
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}
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}
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// Calculate a hash value from a u8 slice
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// used for generating answer cache keys
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pub fn hash_buf(buf: &[u8]) -> u64 {
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let mut hasher = DefaultHasher::new();
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hasher.write(buf);
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hasher.finish()
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}
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