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-rw-r--r--src/otel/.gitignore1
-rw-r--r--src/otel/Cargo.lock2460
-rw-r--r--src/otel/Cargo.toml23
-rw-r--r--src/otel/src/lib.rs323
4 files changed, 2807 insertions, 0 deletions
diff --git a/src/otel/.gitignore b/src/otel/.gitignore
new file mode 100644
index 00000000..2f7896d1
--- /dev/null
+++ b/src/otel/.gitignore
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diff --git a/src/otel/Cargo.lock b/src/otel/Cargo.lock
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diff --git a/src/otel/Cargo.toml b/src/otel/Cargo.toml
new file mode 100644
index 00000000..28664731
--- /dev/null
+++ b/src/otel/Cargo.toml
@@ -0,0 +1,23 @@
+[package]
+name = "otel"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["staticlib"]
+bench = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[dependencies]
+once_cell = "1.19"
+opentelemetry = "0.24.0"
+opentelemetry_sdk = { version = "0.24.1", features = ["rt-tokio", "http", "tokio", "trace"] }
+lazy_static = "1.5.0"
+opentelemetry-otlp = { version = "0.17.0", features = ["http-proto", "tokio", "grpc-tonic","tonic","trace","reqwest-rustls"]}
+tokio = { version = "1", features = ["full"] }
+opentelemetry-semantic-conventions = "0.16.0"
+tracing = { version = "0.1", default-features = false }
+tracing-core = { version = "0.1", default-features = false }
+tracing-subscriber = { version = "0.3", default-features = false }
+async-std = "1.12.0"
+reqwest = { version = "0.12.7", features = ["rustls-tls"] }
diff --git a/src/otel/src/lib.rs b/src/otel/src/lib.rs
new file mode 100644
index 00000000..8e59da86
--- /dev/null
+++ b/src/otel/src/lib.rs
@@ -0,0 +1,323 @@
+#![allow(non_camel_case_types)]
+
+use opentelemetry::global::BoxedSpan;
+use opentelemetry::trace::{
+ Span, SpanBuilder, SpanKind, TraceId, Tracer, TracerProvider,
+};
+use opentelemetry::{global, KeyValue};
+use opentelemetry_otlp::Protocol;
+use opentelemetry_otlp::WithExportConfig;
+use opentelemetry_sdk::trace::{Config, BatchConfigBuilder, Sampler};
+use opentelemetry_sdk::{runtime, Resource};
+use std::ffi::{c_char, CStr, CString};
+use std::{ptr, time};
+use std::ptr::addr_of;
+use std::slice;
+use std::sync::{Arc, OnceLock};
+use tokio::sync::mpsc;
+use tokio::sync::mpsc::{Receiver, Sender};
+
+const TRACEPARENT_HEADER_LEN: u8 = 55;
+const TIMEOUT: time::Duration = std::time::Duration::from_secs(10);
+
+const NXT_LOG_ERR: nxt_uint_t = 1;
+
+#[repr(C)]
+pub struct nxt_str_t {
+ pub length: usize,
+ pub start: *const u8,
+}
+
+#[cfg(target_arch = "x86_64")]
+pub type nxt_uint_t = ::std::os::raw::c_uint;
+
+#[cfg(not(target_arch = "x86_64"))]
+pub type nxt_uint_t = usize;
+
+// Stored sender channel to send spans or a shutdown message to within the
+// Tokio runtime.
+#[allow(static_mut_refs)]
+unsafe fn nxt_otel_rs_span_tx(destruct: bool) -> *const OnceLock<Sender<SpanMessage>> {
+ static mut SPAN_TX: OnceLock<Sender<SpanMessage>> = OnceLock::new();
+ if destruct {
+ SPAN_TX.take();
+ }
+
+ addr_of!(SPAN_TX)
+}
+
+// Message type to send on the channel. Either a span or a shutdown message for
+// graceful termination of the tokio runtime.
+enum SpanMessage {
+ Span {
+ s: Arc<BoxedSpan>
+ },
+ Shutdown,
+}
+
+#[no_mangle]
+unsafe fn nxt_otel_rs_is_init() -> u8 {
+ (*nxt_otel_rs_span_tx(false)).get().map_or(0, |_| 1)
+}
+
+#[no_mangle]
+unsafe fn nxt_otel_rs_uninit() {
+ if nxt_otel_rs_is_init() == 1 {
+ nxt_otel_rs_shutdown_tracer();
+ nxt_otel_rs_span_tx(true);
+ }
+}
+
+// potentially returns an error message
+#[no_mangle]
+unsafe fn nxt_otel_rs_init(
+ log_callback: unsafe extern "C" fn(log_level: nxt_uint_t, msg: *const c_char),
+ endpoint: *const nxt_str_t,
+ protocol: *const nxt_str_t,
+ sample_fraction: f64,
+ batch_size: f64
+) {
+ if endpoint.is_null() || protocol.is_null() {
+ return
+ }
+
+ let ep = String::from_utf8_unchecked(
+ slice::from_raw_parts((*endpoint).start, (*endpoint).length).to_vec()
+ ).clone(); // we want our own memory
+
+ let proto: Protocol;
+ match String::from_utf8_unchecked(
+ slice::from_raw_parts((*protocol).start, (*protocol).length).to_vec()
+ ).to_lowercase()
+ .as_str() {
+ "http" => proto = Protocol::HttpBinary,
+ "grpc" => proto = Protocol::Grpc,
+ e => {
+ let msg_string = format!("unknown tracer type: {:#?}", e);
+ let msg = CString::from_vec_unchecked(msg_string.as_bytes().to_vec());
+ log_callback(NXT_LOG_ERR, msg.into_raw() as _);
+ return;
+ }
+ }
+
+ // make sure we are starting with a clean state
+ nxt_otel_rs_uninit();
+
+ // Create a new mpsc channel. Tokio runtime gets receiver, the send
+ // trace function gets sender.
+ let (tx, rx): (Sender<SpanMessage>, Receiver<SpanMessage>) = mpsc::channel(32);
+
+ // Store the sender so the other function can also reach it.
+ match (*nxt_otel_rs_span_tx(false)).set(tx) {
+ /* spawn a new thread with the tokio runtime and forget about it.
+ * This function will return that allows the C code to carry on
+ * doing its thing, whereas the runtime function is a long lived
+ * process that only exits when a shutdown message is sent.
+ */
+ Ok(_) => {
+ std::thread::spawn(move || nxt_otel_rs_runtime(
+ ep,
+ proto,
+ batch_size,
+ sample_fraction,
+ rx
+ ));
+ },
+ Err(e) => {
+ let msg_string = format!("couldn't initialize tracer: {:#?}", e);
+ let msg = CString::from_vec_unchecked(msg_string.as_bytes().to_vec());
+ log_callback(NXT_LOG_ERR, msg.into_raw() as _);
+ }
+ }
+}
+
+
+/* function that we wrap around Tokio's runtime code. This is long lived,
+ * which means it stops only when a shutdown signal is sent to the rx
+ * channel, or we terminate the process and leave memory all over.
+ */
+#[tokio::main]
+async unsafe fn nxt_otel_rs_runtime(
+ endpoint: String,
+ proto: Protocol,
+ batch_size: f64,
+ sample_fraction: f64,
+ mut rx: Receiver<SpanMessage>
+) {
+ let pipeline = opentelemetry_otlp::new_pipeline()
+ .tracing()
+ .with_trace_config(
+ Config::default()
+ .with_resource(
+ Resource::new(vec![KeyValue::new(
+ opentelemetry_semantic_conventions::resource::SERVICE_NAME,
+ "NGINX Unit",
+ )])
+ )
+ .with_sampler(Sampler::TraceIdRatioBased(sample_fraction))
+ )
+ .with_batch_config(
+ BatchConfigBuilder::default()
+ .with_max_export_batch_size(batch_size as _)
+ .with_max_queue_size(4096)
+ .build()
+ );
+
+ let res = match proto {
+ Protocol::HttpBinary | Protocol::HttpJson => pipeline
+ .with_exporter(
+ opentelemetry_otlp::new_exporter()
+ .http()
+ .with_http_client(reqwest::Client::new()) // needed because rustls feature
+ .with_endpoint(endpoint)
+ .with_protocol(proto)
+ .with_timeout(TIMEOUT)
+ ).install_batch(runtime::Tokio),
+ Protocol::Grpc => pipeline
+ .with_exporter(
+ opentelemetry_otlp::new_exporter()
+ .tonic()
+ .with_endpoint(endpoint)
+ .with_protocol(proto)
+ .with_timeout(TIMEOUT)
+ ).install_batch(runtime::Tokio),
+ };
+
+ match res {
+ Err(e) => {
+ eprintln!("otel tracing error: {}", e);
+ return;
+ }
+ Ok(t) => {
+ global::set_tracer_provider(t);
+ }
+ }
+
+ // this is the block that keeps this function running until it gets shut down.
+ // @see https://tokio.rs/tokio/tutorial/channels for the inspiration.
+ while let Some(message) = rx.recv().await {
+ match message {
+ SpanMessage::Shutdown => {
+ eprintln!("it was a shutdown");
+ break;
+ }
+ SpanMessage::Span { s: _s } => {
+ // do nothing, because the point is for this _s var to be dropped
+ // here rather than where it was sent from.
+ }
+ }
+ }
+}
+
+// it's on the caller to pass in a buf of proper length
+#[no_mangle]
+pub unsafe fn nxt_otel_rs_copy_traceparent(buf: *mut i8, span: *const BoxedSpan) {
+ if buf.is_null() || span.is_null() {
+ return;
+ }
+
+ let traceparent = format!(
+ "00-{:032x}-{:016x}-{:02x}",
+ (*span).span_context().trace_id(), // 16 chars, 32 hex
+ (*span).span_context().span_id(), // 8 byte, 16 hex
+ (*span).span_context().trace_flags() // 1 char, 2 hex
+ );
+
+ assert_eq!(traceparent.len(), TRACEPARENT_HEADER_LEN as usize);
+
+ ptr::copy_nonoverlapping(
+ traceparent.as_bytes().as_ptr(),
+ buf as _,
+ TRACEPARENT_HEADER_LEN as _,
+ );
+ // set null terminator
+ *buf.add(TRACEPARENT_HEADER_LEN as _) = b'\0' as _;
+}
+
+#[no_mangle]
+pub unsafe fn nxt_otel_rs_add_event_to_trace(
+ trace: *mut BoxedSpan,
+ key: *const nxt_str_t,
+ val: *const nxt_str_t,
+) {
+ if !key.is_null() && !val.is_null() && !trace.is_null() {
+ /* We need .clone() here because when using the batch exporter, when the
+ * trace gets exported, the request object that these pointers pointed to
+ * no longer exists.
+ */
+ let key = String::from_utf8_unchecked(
+ slice::from_raw_parts((*key).start, (*key).length).to_vec()
+ ).clone();
+ let val = String::from_utf8_unchecked(
+ slice::from_raw_parts((*val).start, (*val).length).to_vec()
+ ).clone();
+
+ (*trace).add_event(
+ String::from("Unit Attribute"),
+ vec![KeyValue::new(key, val)]
+ );
+ }
+}
+
+#[no_mangle]
+pub unsafe fn nxt_otel_rs_get_or_create_trace(trace_id: *mut i8) -> *mut BoxedSpan {
+ let mut trace_key = None;
+ let trace_cstr: &CStr;
+ if !trace_id.is_null() {
+ trace_cstr = CStr::from_ptr(trace_id as _);
+ // We need .into_owned() here as well to avoid referencing a deallocated piece of memory.
+ if let Ok(id) = TraceId::from_hex(&trace_cstr.to_string_lossy().into_owned()) {
+ trace_key = Some(id);
+ }
+ }
+
+ let tracer = global::tracer_provider().tracer("NGINX Unit");
+ let span = tracer.build(SpanBuilder {
+ trace_id: trace_key,
+ span_kind: Some(SpanKind::Server),
+ ..Default::default()
+ });
+
+ Arc::<BoxedSpan>::into_raw(Arc::new(span)) as *mut BoxedSpan
+}
+
+#[no_mangle]
+pub unsafe fn nxt_otel_rs_send_trace(trace: *mut BoxedSpan) {
+ // damage nothing on an improper call
+ if trace.is_null() {
+ eprintln!("trace was null, returning");
+ return;
+ }
+
+ /* memory needs to be accounted for via arc here
+ * see the final return statement from
+ * nxt_otel_get_or_create_trace
+ */
+ let arc_span = Arc::from_raw(trace);
+
+ /* Instead of dropping the reference at the end of this function
+ * we'll send the entire Arc through the channel to the long
+ * running process that will drop it there. The reason we need to
+ * drop it there, rather than here is because that code block is
+ * within the tokio runtime context with the mpsc channels still
+ * open, whereas if we tried to do it here, it would fail for
+ * a number of different reasons:
+ * - channel closed
+ * - not a tokio runtime
+ * - different tokio runtime
+ */
+ (*nxt_otel_rs_span_tx(false))
+ .get()
+ .and_then(|x| Some(x.try_send(SpanMessage::Span{ s: arc_span })));
+}
+
+/* Function to send a shutdown signal to the tokio runtime.
+ * The receive loop will break and exit.
+ * It might be better to close the channels here instead.
+ */
+#[no_mangle]
+pub unsafe fn nxt_otel_rs_shutdown_tracer() {
+ (*nxt_otel_rs_span_tx(false))
+ .get()
+ .and_then(|x| Some(x.try_send(SpanMessage::Shutdown)));
+}