Upgrade headers and adapt mas-tower tracer context utils

Author: sandhose

Cargo.lock

@@ -99,7 +99,7 @@ features = ["env", "yaml", "test"]
 
 # HTTP headers
 [workspace.dependencies.headers]
-version = "0.3.9"
+version = "0.4.0"
 
 # HTTP request/response
 [workspace.dependencies.http]

Cargo.toml

@@ -14,11 +14,25 @@
 
 use http::Request;
 use opentelemetry::propagation::Injector;
-use opentelemetry_http::HeaderInjector;
 use tower::{Layer, Service};
 use tracing::Span;
 use tracing_opentelemetry::OpenTelemetrySpanExt;
 
+/// Same as the one in opentelemetry-http, but updated for the http@1 upgrade
+pub struct HeaderInjector<'a>(pub &'a mut http::HeaderMap);
+
+impl<'a> Injector for HeaderInjector<'a> {
+    /// Set a key and value in the [`HeaderMap`].  Does nothing if the key or
+    /// value are not valid inputs.
+    fn set(&mut self, key: &str, value: String) {
+        if let Ok(name) = http::header::HeaderName::from_bytes(key.as_bytes()) {
+            if let Ok(val) = http::header::HeaderValue::from_str(&value) {
+                self.0.insert(name, val);
+            }
+        }
+    }
+}
+
 /// A trait to get an [`Injector`] from a request.
 trait AsInjector {
     type Injector<'a>: Injector