use std::time::SystemTime;
use futures::sync::mpsc;
use opentracing_rs_core::{BaggageItem, Tag};
pub type Span = opentracing_rs_core::Span<SpanState>;
pub type SpanReference = opentracing_rs_core::SpanReference<SpanState>;
#[derive(Debug, Clone)]
pub struct TraceId {
pub(crate) low: u64,
pub(crate) high: u64,
}
impl TraceId {
pub fn new() -> Self {
Self {
low: rand::random(),
high: rand::random(),
}
}
}
#[derive(Debug, Clone)]
pub struct SpanState {
trace_id: TraceId,
span_id: u64,
}
impl SpanState {
pub fn new() -> Self {
Self {
trace_id: TraceId::new(),
span_id: rand::random(),
}
}
pub fn from_parent(parent: Self) -> Self {
Self {
trace_id: parent.trace_id,
span_id: rand::random(),
}
}
}
impl Default for SpanState {
fn default() -> Self {
Self::new()
}
}
pub struct SpanBuilder {
sender: mpsc::UnboundedSender<Span>,
operation_name: String,
start_time: Option<SystemTime>,
tags: Vec<Tag>,
references: Vec<SpanReference>,
baggage_items: Vec<BaggageItem>,
}
impl SpanBuilder {
pub fn new<O>(operation_name: O, sender: mpsc::UnboundedSender<Span>) -> Self
where
O: Into<String>,
{
let operation_name = operation_name.into();
let baggage_items = Vec::new();
let tags = Vec::new();
let references = Vec::new();
Self {
sender,
operation_name,
baggage_items,
tags,
references,
start_time: None,
}
}
}
impl opentracing_rs_core::SpanBuilder<SpanState> for SpanBuilder {
fn start_time(mut self, time: SystemTime) -> Self {
self.start_time = Some(time);
self
}
fn tag(mut self, tag: Tag) -> Self {
self.tags.push(tag);
self
}
fn child_of(mut self, span: &Span) -> Self {
self.baggage_items
.extend(span.context().baggage_items().clone());
self.references
.push(opentracing_rs_core::SpanReference::ChildOf(
span.context().state().clone(),
));
self
}
fn start(self) -> Span {
let mut state = None;
for reference in &self.references {
match reference {
opentracing_rs_core::SpanReference::ChildOf(parent) => {
state = Some(SpanState::from_parent(parent.clone()))
}
_ => {}
}
}
Span::new(
self.sender,
self.operation_name,
self.start_time.unwrap_or_else(SystemTime::now),
self.tags,
self.references,
state.unwrap_or_else(SpanState::default),
self.baggage_items,
)
}
}