[opentelemetry-otlp] adds an example HTTP exporter backed by Hyper (#…

…1861)

Co-authored-by: Cijo Thomas <cijo.thomas@gmail.com>

opentelemetry-otlp/examples/basic-otlp-http/Cargo.toml

@@ -5,14 +5,25 @@ edition = "2021"
 license = "Apache-2.0"
 publish = false
 
+[features]
+default = ["reqwest"]
+reqwest = ["opentelemetry-otlp/reqwest-client"]
+hyper = ["dep:async-trait", "dep:http", "dep:hyper", "dep:opentelemetry-http", "dep:bytes"]
+
+
 [dependencies]
 once_cell = { workspace = true }
 opentelemetry = { path = "../../../opentelemetry" }
 opentelemetry_sdk = { path = "../../../opentelemetry-sdk", features = ["rt-tokio", "metrics", "logs"] }
+opentelemetry-http = { path = "../../../opentelemetry-http", optional = true }
 opentelemetry-otlp = { path = "../..", features = ["http-proto", "reqwest-client", "logs"] }
 opentelemetry-appender-tracing = { path = "../../../opentelemetry-appender-tracing", default-features = false}
 opentelemetry-semantic-conventions = { path = "../../../opentelemetry-semantic-conventions" }
 
+async-trait = { workspace = true, optional = true }
+bytes = { workspace = true, optional = true }
+http = { workspace = true, optional = true }
+hyper = { workspace = true, features = ["client"], optional = true }
 tokio = { workspace = true, features = ["full"] }
 tracing = { workspace = true, features = ["std"]}
 tracing-core = { workspace = true }

opentelemetry-otlp/examples/basic-otlp-http/README.md

@@ -52,6 +52,14 @@ Run the app which exports logs, metrics and traces via OTLP to the collector
 cargo run
 ```
 
+
+By default the app will use a `reqwest` client to send. A hyper 0.14 client can be used with the `hyper` feature enabled
+
+```shell
+cargo run --no-default-features --features=hyper
+```
+
+
 ## View results
 
 You should be able to see something similar below with different time and ID in the same console that docker runs.

opentelemetry-otlp/examples/basic-otlp-http/src/hyper.rs

@@ -0,0 +1,45 @@
+use async_trait::async_trait;
+use bytes::Bytes;
+use http::{Request, Response};
+use hyper::{
+    client::{connect::Connect, HttpConnector},
+    Body, Client,
+};
+use opentelemetry_http::{HttpClient, HttpError, ResponseExt};
+
+pub struct HyperClient<C> {
+    inner: hyper::Client<C>,
+}
+
+impl Default for HyperClient<HttpConnector> {
+    fn default() -> Self {
+        Self {
+            inner: Client::new(),
+        }
+    }
+}
+
+impl<C> std::fmt::Debug for HyperClient<C> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("HyperClient")
+            .field("inner", &self.inner)
+            .finish()
+    }
+}
+
+#[async_trait]
+impl<C: Connect + Clone + Send + Sync + 'static> HttpClient for HyperClient<C> {
+    async fn send(&self, request: Request<Vec<u8>>) -> Result<Response<Bytes>, HttpError> {
+        let request = request.map(Body::from);
+
+        let (parts, body) = self
+            .inner
+            .request(request)
+            .await?
+            .error_for_status()?
+            .into_parts();
+        let body = hyper::body::to_bytes(body).await?;
+
+        Ok(Response::from_parts(parts, body))
+    }
+}

opentelemetry-otlp/examples/basic-otlp-http/src/main.rs

@@ -6,7 +6,7 @@ use opentelemetry::{
     Key, KeyValue,
 };
 use opentelemetry_appender_tracing::layer::OpenTelemetryTracingBridge;
-use opentelemetry_otlp::WithExportConfig;
+use opentelemetry_otlp::{HttpExporterBuilder, WithExportConfig};
 use opentelemetry_sdk::trace::{self as sdktrace, Config};
 use opentelemetry_sdk::{
     logs::{self as sdklogs},
@@ -18,45 +18,43 @@ use tracing_subscriber::EnvFilter;
 
 use std::error::Error;
 
+#[cfg(feature = "hyper")]
+mod hyper;
+
 static RESOURCE: Lazy<Resource> = Lazy::new(|| {
     Resource::new(vec![KeyValue::new(
         opentelemetry_semantic_conventions::resource::SERVICE_NAME,
         "basic-otlp-example",
     )])
 });
 
+fn http_exporter() -> HttpExporterBuilder {
+    let exporter = opentelemetry_otlp::new_exporter().http();
+    #[cfg(feature = "hyper")]
+    let exporter = exporter.with_http_client(hyper::HyperClient::default());
+    exporter
+}
+
 fn init_logs() -> Result<sdklogs::LoggerProvider, opentelemetry::logs::LogError> {
     opentelemetry_otlp::new_pipeline()
         .logging()
         .with_resource(RESOURCE.clone())
-        .with_exporter(
-            opentelemetry_otlp::new_exporter()
-                .http()
-                .with_endpoint("http://localhost:4318/v1/logs"),
-        )
+        .with_exporter(http_exporter().with_endpoint("http://localhost:4318/v1/logs"))
         .install_batch(opentelemetry_sdk::runtime::Tokio)
 }
 
 fn init_tracer_provider() -> Result<sdktrace::TracerProvider, TraceError> {
     opentelemetry_otlp::new_pipeline()
         .tracing()
-        .with_exporter(
-            opentelemetry_otlp::new_exporter()
-                .http()
-                .with_endpoint("http://localhost:4318/v1/traces"),
-        )
+        .with_exporter(http_exporter().with_endpoint("http://localhost:4318/v1/traces"))
         .with_trace_config(Config::default().with_resource(RESOURCE.clone()))
         .install_batch(opentelemetry_sdk::runtime::Tokio)
 }
 
 fn init_metrics() -> Result<opentelemetry_sdk::metrics::SdkMeterProvider, MetricsError> {
     opentelemetry_otlp::new_pipeline()
         .metrics(opentelemetry_sdk::runtime::Tokio)
-        .with_exporter(
-            opentelemetry_otlp::new_exporter()
-                .http()
-                .with_endpoint("http://localhost:4318/v1/metrics"),
-        )
+        .with_exporter(http_exporter().with_endpoint("http://localhost:4318/v1/metrics"))
         .with_resource(RESOURCE.clone())
         .build()
 }