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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
use serde::{Deserialize, Serialize};
/// A flow ID for connecting profiler markers across time.
///
/// Analogous to the C++ `Flow` class in `mozglue/baseprofiler/public/Flow.h`.
#[derive(Serialize, Deserialize, Debug, Clone, Copy)]
pub struct FlowId(u64);
impl<T> From<*const T> for FlowId {
fn from(ptr: *const T) -> Self {
FlowId(ptr as usize as u64)
}
}
impl<T> From<*mut T> for FlowId {
fn from(ptr: *mut T) -> Self {
FlowId(ptr as usize as u64)
}
}
impl From<u64> for FlowId {
fn from(id: u64) -> Self {
FlowId(id)
}
}
impl FlowId {
/// Returns a 16-byte ASCII hex representation of this flow ID,
/// suitable for writing as a profiler marker flow property.
pub fn to_hex(self) -> [u8; 16] {
let mut buf = [0; 16];
let hex_digits = b"0123456789abcdef";
for i in 0..16 {
buf[i] = hex_digits[(self.0 >> (60 - i * 4)) as usize & 0xf];
}
buf
}
}