otel: add opentelemetry rust crate code

This is purely the source code of the rust end of opentelemetry. It does
not have build tooling wired up yet, nor is this used from the C code.

Signed-off-by: Ava Hahn <a.hahn@f5.com>
Signed-off-by: Gabor Javorszky <g.javorszky@f5.com>

4 files changed, 2512 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
@@ -0,0 +1 @@
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diff --git a/src/otel/Cargo.lock b/src/otel/Cargo.lock
new file mode 100644
index 00000000..c1a0e439
--- /dev/null
+++ b/src/otel/Cargo.lock
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+ "windows_i686_gnu",
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+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
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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..363df4fb
--- /dev/null
+++ b/src/otel/src/lib.rs
@@ -0,0 +1,322 @@
+#![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.
+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)));
+}