Match stable Semantic Conventions for HTTP Spans

The stable [Semantic Conventions for HTTP
Spans](https://opentelemetry.io/docs/specs/semconv/http/http-spans/) use
different keys than the ones used in this crate. This changes them to
match the keys as defined by the stable specification.

reqwest-tracing/CHANGELOG.md

@@ -9,11 +9,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Breaking changes
 - Upgraded `reqwest-middleware` to `0.3.0`.
 - Removed support for `opentelemetry` 0.13 to 0.19
+- The keys emitted by the crate now match the stable Semantic Conventions for HTTP Spans.
 
 ### Changed
 - The keys emitted by the crate now match the stable Semantic Conventions for HTTP Spans.
 - Opentelemetry features are now additive.
 
+### Deprecated
+- The old keys are now deprecated.
+
 ## [0.4.8] - 2024-03-11
 
 ### Added

reqwest-tracing/src/lib.rs

@@ -91,12 +91,14 @@ mod middleware;
 mod otel;
 mod reqwest_otel_span_builder;
 pub use middleware::TracingMiddleware;
+#[allow(deprecated)]
 pub use reqwest_otel_span_builder::{
     default_on_request_end, default_on_request_failure, default_on_request_success,
     default_span_name, DefaultSpanBackend, DisableOtelPropagation, OtelName, OtelPathNames,
     ReqwestOtelSpanBackend, SpanBackendWithUrl, ERROR_CAUSE_CHAIN, ERROR_MESSAGE, HTTP_HOST,
-    HTTP_METHOD, HTTP_SCHEME, HTTP_STATUS_CODE, HTTP_URL, HTTP_USER_AGENT, NET_HOST_PORT,
-    OTEL_KIND, OTEL_NAME, OTEL_STATUS_CODE,
+    HTTP_METHOD, HTTP_REQUEST_METHOD, HTTP_RESPONSE_STATUS_CODE, HTTP_SCHEME, HTTP_STATUS_CODE,
+    HTTP_URL, HTTP_USER_AGENT, NET_HOST_PORT, OTEL_KIND, OTEL_NAME, OTEL_STATUS_CODE,
+    SERVER_ADDRESS, SERVER_PORT, URL_FULL, URL_SCHEME, USER_AGENT_ORIGINAL,
 };
 
 #[doc(hidden)]

reqwest-tracing/src/reqwest_otel_span_builder.rs

@@ -2,36 +2,57 @@ use std::borrow::Cow;
 
 use http::Extensions;
 use matchit::Router;
-use reqwest::header::{HeaderMap, HeaderValue};
-use reqwest::{Request, Response, StatusCode as RequestStatusCode, Url};
+use reqwest::{header::HeaderValue, Request, Response, StatusCode as RequestStatusCode, Url};
 use reqwest_middleware::{Error, Result};
 use tracing::{warn, Span};
 
 use crate::reqwest_otel_span;
 
-/// The `http.method` field added to the span by [`reqwest_otel_span`]
-pub const HTTP_METHOD: &str = "http.method";
-/// The `http.scheme` field added to the span by [`reqwest_otel_span`]
-pub const HTTP_SCHEME: &str = "http.scheme";
-/// The `http.host` field added to the span by [`reqwest_otel_span`]
-pub const HTTP_HOST: &str = "http.host";
-/// The `http.url` field added to the span by [`reqwest_otel_span`]
-pub const HTTP_URL: &str = "http.url";
-/// The `host.port` field added to the span by [`reqwest_otel_span`]
-pub const NET_HOST_PORT: &str = "net.host.port";
+/// The `http.request.method` field added to the span by [`reqwest_otel_span`]
+pub const HTTP_REQUEST_METHOD: &str = "http.request.method";
+/// The `url.scheme` field added to the span by [`reqwest_otel_span`]
+pub const URL_SCHEME: &str = "url.scheme";
+/// The `server.address` field added to the span by [`reqwest_otel_span`]
+pub const SERVER_ADDRESS: &str = "server.address";
+/// The `server.port` field added to the span by [`reqwest_otel_span`]
+pub const SERVER_PORT: &str = "server.port";
+/// The `url.full` field added to the span by [`reqwest_otel_span`]
+pub const URL_FULL: &str = "url.full";
+/// The `user_agent.original` field added to the span by [`reqwest_otel_span`]
+pub const USER_AGENT_ORIGINAL: &str = "user_agent.original";
 /// The `otel.kind` field added to the span by [`reqwest_otel_span`]
 pub const OTEL_KIND: &str = "otel.kind";
 /// The `otel.name` field added to the span by [`reqwest_otel_span`]
 pub const OTEL_NAME: &str = "otel.name";
 /// The `otel.status_code` field added to the span by [`reqwest_otel_span`]
 pub const OTEL_STATUS_CODE: &str = "otel.status_code";
+/// The `http.response.status_code` field added to the span by [`reqwest_otel_span`]
+pub const HTTP_RESPONSE_STATUS_CODE: &str = "http.response.status_code";
 /// The `error.message` field added to the span by [`reqwest_otel_span`]
 pub const ERROR_MESSAGE: &str = "error.message";
 /// The `error.cause_chain` field added to the span by [`reqwest_otel_span`]
 pub const ERROR_CAUSE_CHAIN: &str = "error.cause_chain";
-/// The `http.status_code` field added to the span by [`reqwest_otel_span`]
+
+/// The deprecated `http.method` field added to the span by [`reqwest_otel_span`]
+#[deprecated]
+pub const HTTP_METHOD: &str = "http.method";
+/// The deprecated `http.scheme` field added to the span by [`reqwest_otel_span`]
+#[deprecated]
+pub const HTTP_SCHEME: &str = "http.scheme";
+/// The deprecated `http.host` field added to the span by [`reqwest_otel_span`]
+#[deprecated]
+pub const HTTP_HOST: &str = "http.host";
+/// The deprecated `http.url` field added to the span by [`reqwest_otel_span`]
+#[deprecated]
+pub const HTTP_URL: &str = "http.url";
+/// The deprecated `host.port` field added to the span by [`reqwest_otel_span`]
+#[deprecated]
+pub const NET_HOST_PORT: &str = "net.host.port";
+/// The deprecated `http.status_code` field added to the span by [`reqwest_otel_span`]
+#[deprecated]
 pub const HTTP_STATUS_CODE: &str = "http.status_code";
-/// The `http.user_agent` added to the span by [`reqwest_otel_span`]
+/// The deprecated `http.user_agent` added to the span by [`reqwest_otel_span`]
+#[deprecated]
 pub const HTTP_USER_AGENT: &str = "http.user_agent";
 
 /// [`ReqwestOtelSpanBackend`] allows you to customise the span attached by
@@ -61,12 +82,10 @@ pub fn default_on_request_end(span: &Span, outcome: &Result<Response>) {
 #[inline]
 pub fn default_on_request_success(span: &Span, response: &Response) {
     let span_status = get_span_status(response.status());
-    let user_agent = get_header_value("user_agent", response.headers());
     if let Some(span_status) = span_status {
         span.record(OTEL_STATUS_CODE, span_status);
     }
-    span.record(HTTP_STATUS_CODE, response.status().as_u16());
-    span.record(HTTP_USER_AGENT, user_agent.as_str());
+    span.record(HTTP_RESPONSE_STATUS_CODE, response.status().as_u16());
 }
 
 /// Populates default failure fields for a given [`reqwest_otel_span!`] span.
@@ -79,7 +98,7 @@ pub fn default_on_request_failure(span: &Span, e: &Error) {
     span.record(ERROR_CAUSE_CHAIN, error_cause_chain.as_str());
     if let Error::Reqwest(e) = e {
         if let Some(status) = e.status() {
-            span.record(HTTP_STATUS_CODE, status.as_u16());
+            span.record(HTTP_RESPONSE_STATUS_CODE, status.as_u16());
         }
     }
 }
@@ -122,11 +141,6 @@ impl ReqwestOtelSpanBackend for DefaultSpanBackend {
     }
 }
 
-fn get_header_value(key: &str, headers: &HeaderMap) -> String {
-    let header_default = &HeaderValue::from_static("");
-    format!("{:?}", headers.get(key).unwrap_or(header_default)).replace('"', "")
-}
-
 /// Similar to [`DefaultSpanBackend`] but also adds the `http.url` attribute to request spans.
 ///
 /// [`TracingMiddleware`]: crate::middleware::TracingMiddleware

reqwest-tracing/src/reqwest_otel_span_macro.rs

@@ -3,15 +3,16 @@
 /// It empowers you to add custom properties to the span on top of the default properties provided by the macro
 ///
 /// Default Fields:
-/// - http.method
-/// - http.scheme
-/// - http.host
-/// - net.host
+/// - http.request.method
+/// - url.scheme
+/// - server.address
+/// - server.port
+/// - url.full
 /// - otel.kind
 /// - otel.name
 /// - otel.status_code
-/// - http.user_agent
-/// - http.status_code
+/// - user_agent.original
+/// - http.response.status_code
 /// - error.message
 /// - error.cause_chain
 ///
@@ -122,23 +123,26 @@ macro_rules! reqwest_otel_span {
             let url = $request.url();
             let scheme = url.scheme();
             let host = url.host_str().unwrap_or("");
-            let host_port = url.port().unwrap_or(0) as i64;
+            let host_port = url.port_or_known_default().unwrap_or(0) as i64;
             let otel_name = $name.to_string();
+            let header_default = &HeaderValue::from_static("");
+            let user_agent = format!("{:?}", $request.headers().get("user_agent").unwrap_or(header_default)).replace('"', "");
 
             macro_rules! request_span {
                 ($lvl:expr) => {
                     $crate::reqwest_otel_span_macro::private::span!(
                         $lvl,
                         "HTTP request",
-                        http.method = %method,
-                        http.scheme = %scheme,
-                        http.host = %host,
-                        net.host.port = %host_port,
+                        http.request.method = %method,
+                        url.scheme = %scheme,
+                        server.address = %host,
+                        server.port = %host_port,
+                        url.full = %url,
+                        user_agent.original = %user_agent,
                         otel.kind = "client",
                         otel.name = %otel_name,
                         otel.status_code = tracing::field::Empty,
-                        http.user_agent = tracing::field::Empty,
-                        http.status_code = tracing::field::Empty,
+                        http.response.status_code = tracing::field::Empty,
                         error.message = tracing::field::Empty,
                         error.cause_chain = tracing::field::Empty,
                         $($field)*