Update http example with json protocol (#1912)

Co-authored-by: Cijo Thomas <cijo.thomas@gmail.com>
Co-authored-by: Lalit Kumar Bhasin <labhas@microsoft.com>

opentelemetry-otlp/Cargo.toml

@@ -71,7 +71,6 @@ tls-webpki-roots = ["tls", "tonic/tls-webpki-roots"]
 
 # http binary
 http-proto = ["prost", "opentelemetry-http", "opentelemetry-proto/gen-tonic-messages", "http", "trace", "metrics"]
-# http json This does not work today due to known issue. See https://github.com/open-telemetry/opentelemetry-rust/issues/1763.
 http-json = ["serde_json", "prost", "opentelemetry-http", "opentelemetry-proto/gen-tonic-messages", "opentelemetry-proto/with-serde", "http", "trace", "metrics"]
 reqwest-blocking-client = ["reqwest/blocking", "opentelemetry-http/reqwest"]
 reqwest-client = ["reqwest", "opentelemetry-http/reqwest"]

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

@@ -16,7 +16,7 @@ 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-otlp = { path = "../..", features = ["http-proto", "http-json", "reqwest-client", "logs"] }
 opentelemetry-appender-tracing = { path = "../../../opentelemetry-appender-tracing", default-features = false}
 opentelemetry-semantic-conventions = { path = "../../../opentelemetry-semantic-conventions" }
 

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

@@ -1,9 +1,9 @@
 # Basic OTLP exporter Example
 
 This example shows how to setup OpenTelemetry OTLP exporter for logs, metrics
-and traces to exports them to the [OpenTelemetry
+and traces to export them to the [OpenTelemetry
 Collector](https://github.com/open-telemetry/opentelemetry-collector) via OTLP
-over HTTP/protobuf. The Collector then sends the data to the appropriate
+over selected protocol such as HTTP/protobuf or HTTP/json. The Collector then sends the data to the appropriate
 backend, in this case, the logging Exporter, which displays data to console.
 
 ## Usage

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

@@ -6,18 +6,18 @@ use opentelemetry::{
     Key, KeyValue,
 };
 use opentelemetry_appender_tracing::layer::OpenTelemetryTracingBridge;
+use opentelemetry_otlp::Protocol;
 use opentelemetry_otlp::{HttpExporterBuilder, WithExportConfig};
 use opentelemetry_sdk::trace::{self as sdktrace, Config};
 use opentelemetry_sdk::{
     logs::{self as sdklogs},
     Resource,
 };
+use std::error::Error;
 use tracing::info;
 use tracing_subscriber::prelude::*;
 use tracing_subscriber::EnvFilter;
 
-use std::error::Error;
-
 #[cfg(feature = "hyper")]
 mod hyper;
 
@@ -39,22 +39,34 @@ fn init_logs() -> Result<sdklogs::LoggerProvider, opentelemetry::logs::LogError>
     opentelemetry_otlp::new_pipeline()
         .logging()
         .with_resource(RESOURCE.clone())
-        .with_exporter(http_exporter().with_endpoint("http://localhost:4318/v1/logs"))
+        .with_exporter(
+            http_exporter()
+                .with_protocol(Protocol::HttpBinary) //can be changed to `Protocol::HttpJson` to export in JSON format
+                .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(http_exporter().with_endpoint("http://localhost:4318/v1/traces"))
+        .with_exporter(
+            http_exporter()
+                .with_protocol(Protocol::HttpBinary) //can be changed to `Protocol::HttpJson` to export in JSON format
+                .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(http_exporter().with_endpoint("http://localhost:4318/v1/metrics"))
+        .with_exporter(
+            http_exporter()
+                .with_protocol(Protocol::HttpBinary) //can be changed to `Protocol::HttpJson` to export in JSON format
+                .with_endpoint("http://localhost:4318/v1/metrics"),
+        )
         .with_resource(RESOURCE.clone())
         .build()
 }