diff options
| -rw-r--r-- | src/otel/.gitignore | 1 | ||||
| -rw-r--r-- | src/otel/Cargo.lock | 2166 | ||||
| -rw-r--r-- | src/otel/Cargo.toml | 23 | ||||
| -rw-r--r-- | src/otel/src/lib.rs | 322 |
4 files changed, 2512 insertions, 0 deletions
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"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))); +} |