proxmox-uuid: implement uuid on target wasm

proxmox-uuid/Cargo.toml

@@ -18,3 +18,6 @@ default = []
 [dev-dependencies]
 serde = "1.0"
 serde_json = "1.0"
+
+[target.'cfg(target_arch="wasm32")'.dependencies]
+js-sys = "0.3.55"

proxmox-uuid/src/lib.rs

@@ -3,12 +3,15 @@
 use std::borrow::{Borrow, BorrowMut};
 use std::fmt;
 
-#[link(name = "uuid")]
-extern "C" {
-    fn uuid_generate(out: *mut [u8; 16]);
-    fn uuid_unparse_lower(input: *const [u8; 16], out: *mut u8);
-    fn uuid_unparse_upper(input: *const [u8; 16], out: *mut u8);
-}
+#[cfg(not(target_arch="wasm32"))]
+mod lib_uuid_bindings;
+#[cfg(not(target_arch="wasm32"))]
+use lib_uuid_bindings::*;
+
+#[cfg(target_arch="wasm32")]
+mod wasm;
+#[cfg(target_arch="wasm32")]
+pub use wasm::*;
 
 /// An error parsing a uuid from a string.
 #[derive(Debug, Clone, Copy)]
@@ -177,30 +180,6 @@ impl fmt::Display for Uuid {
     }
 }
 
-impl fmt::LowerHex for Uuid {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let mut buf = [0u8; 37];
-        unsafe {
-            uuid_unparse_lower(self.as_bytes(), buf.as_mut_ptr());
-        }
-        write!(f, "{}", unsafe {
-            std::str::from_utf8_unchecked(&buf[..36])
-        })
-    }
-}
-
-impl fmt::UpperHex for Uuid {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let mut buf = [0u8; 37];
-        unsafe {
-            uuid_unparse_upper(self.as_bytes(), buf.as_mut_ptr());
-        }
-        write!(f, "{}", unsafe {
-            std::str::from_utf8_unchecked(&buf[..36])
-        })
-    }
-}
-
 impl std::str::FromStr for Uuid {
     type Err = UuidError;
 
@@ -209,20 +188,6 @@ impl std::str::FromStr for Uuid {
     }
 }
 
-#[cfg(feature = "serde")]
-impl serde::Serialize for Uuid {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: serde::Serializer,
-    {
-        let mut buf = [0u8; 37];
-        unsafe {
-            uuid_unparse_lower(self.as_bytes(), buf.as_mut_ptr());
-        }
-        serializer.serialize_str(unsafe { std::str::from_utf8_unchecked(&buf[..36]) })
-    }
-}
-
 //forward_deserialize_to_from_str!(Uuid);
 #[cfg(feature = "serde")]
 impl<'de> serde::Deserialize<'de> for Uuid {

proxmox-uuid/src/lib_uuid_bindings.rs

@@ -0,0 +1,48 @@
+use std::fmt;
+
+use crate::Uuid;
+
+#[link(name = "uuid")]
+extern "C" {
+    pub fn uuid_generate(out: *mut [u8; 16]);
+    fn uuid_unparse_lower(input: *const [u8; 16], out: *mut u8);
+    fn uuid_unparse_upper(input: *const [u8; 16], out: *mut u8);
+}
+
+impl fmt::LowerHex for Uuid {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let mut buf = [0u8; 37];
+        unsafe {
+            uuid_unparse_lower(self.as_bytes(), buf.as_mut_ptr());
+        }
+        write!(f, "{}", unsafe {
+            std::str::from_utf8_unchecked(&buf[..36])
+        })
+    }
+}
+
+impl fmt::UpperHex for Uuid {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let mut buf = [0u8; 37];
+        unsafe {
+            uuid_unparse_upper(self.as_bytes(), buf.as_mut_ptr());
+        }
+        write!(f, "{}", unsafe {
+            std::str::from_utf8_unchecked(&buf[..36])
+        })
+    }
+}
+
+#[cfg(feature = "serde")]
+impl serde::Serialize for Uuid {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        let mut buf = [0u8; 37];
+        unsafe {
+            uuid_unparse_lower(self.as_bytes(), buf.as_mut_ptr());
+        }
+        serializer.serialize_str(unsafe { std::str::from_utf8_unchecked(&buf[..36]) })
+    }
+}

proxmox-uuid/src/wasm.rs

@@ -0,0 +1,102 @@
+pub fn uuid_generate(out: *mut [u8; 16]) {
+
+    // TODO: implement soemthing better than this
+
+    let time = js_sys::Date::now() as u64;
+    let random1 = (js_sys::Math::random() * f64::MAX) as u64;
+    let random2 = (js_sys::Math::random() * f64::MAX) as u64;
+    let random3 = (js_sys::Math::random() * f64::MAX) as u64;
+    let random4 = (js_sys::Math::random() * f64::MAX) as u64;
+
+    let mut bytes1 = [0u8; 16];
+    let mut bytes2 = [0u8; 16];
+    let mut bytes3 = [0u8; 16];
+
+    bytes1[0..8].copy_from_slice(&random1.to_le_bytes());
+    bytes1[8..16].copy_from_slice(&random2.to_le_bytes());
+
+    let random3 = random3.to_le_bytes();
+
+    bytes2[0..4].copy_from_slice(&random3[0..4]);
+    bytes2[4..12].copy_from_slice(&random4.to_le_bytes());
+    bytes2[12..16].copy_from_slice(&random3[4..8]);
+
+    bytes3[0..8].copy_from_slice(&time.to_le_bytes());
+    bytes3[8..16].copy_from_slice(&time.to_le_bytes());
+
+    if out.is_null() { return; }
+
+    let out = unsafe { out.as_mut().unwrap() };
+
+    for i in 0..16 {
+        let v = bytes1[i] ^  bytes2[i]  ^ bytes3[i];
+        out[i] = v;
+    }
+}
+
+// Copied from uuid crate: https://github.com/uuid-rs/uuid.git
+// adopted types to our needs
+
+const UPPER: [u8; 16] = [
+    b'0', b'1', b'2', b'3', b'4', b'5', b'6', b'7', b'8', b'9', b'A', b'B',
+    b'C', b'D', b'E', b'F',
+];
+const LOWER: [u8; 16] = [
+    b'0', b'1', b'2', b'3', b'4', b'5', b'6', b'7', b'8', b'9', b'a', b'b',
+    b'c', b'd', b'e', b'f',
+];
+/// The segments of a UUID's [u8; 16] corresponding to each group.
+const BYTE_POSITIONS: [usize; 6] = [0, 4, 6, 8, 10, 16];
+/// The locations that hyphens are written into the buffer, after each
+/// group.
+const HYPHEN_POSITIONS: [usize; 4] = [8, 13, 18, 23];
+
+pub fn uuid_encode(
+    uuid: &[u8; 16],
+    upper: bool,
+) -> String {
+    let mut buffer = [0u8; 36];
+
+    let hex = if upper { &UPPER } else { &LOWER };
+
+    for group in 0..5 {
+        let hyphens_before = group;
+        for idx in BYTE_POSITIONS[group]..BYTE_POSITIONS[group + 1] {
+            let b = uuid[idx];
+            let out_idx = hyphens_before + 2 * idx;
+
+            buffer[out_idx] = hex[(b >> 4) as usize];
+            buffer[out_idx + 1] = hex[(b & 0b1111) as usize];
+        }
+
+        if group != 4 {
+            buffer[HYPHEN_POSITIONS[group]] = b'-';
+        }
+    }
+
+    std::str::from_utf8(&mut buffer[..])
+        .expect("found non-ASCII output characters while encoding a UUID")
+        .to_string()
+}
+
+impl fmt::LowerHex for Uuid {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", uuid_encode(self.as_bytes(), false))
+    }
+}
+
+impl fmt::UpperHex for Uuid {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", uuid_encode(self.as_bytes(), true))
+    }
+}
+
+#[cfg(feature = "serde")]
+impl serde::Serialize for Uuid {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        serializer.serialize_str(&uuid_encode(self.as_bytes(), false))
+    }
+}