Integration test for non tokio main (#2520)

.cspell.json

@@ -64,6 +64,7 @@
         "shoppingcart",
         "struct",
         "Tescher",
+        "testcontainers",
         "testresults",
         "thiserror",
         "tracerprovider",

opentelemetry-otlp/tests/integration_test/Cargo.toml

@@ -14,6 +14,7 @@ testcontainers = { version = "0.23.1", features = ["http_wait"]}
 once_cell.workspace = true
 anyhow = "1.0.94"
 ctor = "0.2.9"
+uuid = { version = "1.3", features = ["v4"] }
 tracing-subscriber = { workspace = true, features = ["env-filter","registry", "std", "fmt"] }
 tracing = {workspace = true}
 

opentelemetry-otlp/tests/integration_test/src/test_utils.rs

@@ -52,7 +52,7 @@ fn init_tracing() {
         // Initialize the tracing subscriber with the OpenTelemetry layer and the
         // Fmt layer.
         tracing_subscriber::registry().with(fmt_layer).init();
-        otel_info!(name: "tracing initializing completed!");
+        otel_info!(name: "tracing::fmt initializing completed! SDK internal logs will be printed to stdout.");
     });
 }
 

opentelemetry-otlp/tests/integration_test/tests/logs.rs

@@ -2,13 +2,12 @@
 
 use anyhow::Result;
 use ctor::dtor;
-use integration_test_runner::logs_asserter::{read_logs_from_json, LogsAsserter};
 use integration_test_runner::test_utils;
 use opentelemetry_otlp::LogExporter;
 use opentelemetry_sdk::logs::LoggerProvider;
 use opentelemetry_sdk::{logs as sdklogs, Resource};
 use std::fs::File;
-use std::os::unix::fs::MetadataExt;
+use std::io::Read;
 
 fn init_logs() -> Result<sdklogs::LoggerProvider> {
     let exporter_builder = LogExporter::builder();
@@ -36,12 +35,23 @@ fn init_logs() -> Result<sdklogs::LoggerProvider> {
 
 #[cfg(test)]
 mod logtests {
+    // TODO: The tests in this mod works like below: Emit a log with a UUID,
+    // then read the logs from the file and check if the UUID is present in the
+    // logs. This makes it easy to validate with a single collector and its
+    // output. This is a very simple test but good enough to validate that OTLP
+    // Exporter did work! A more comprehensive test would be to validate the
+    // entire Payload. The infra for it already exists (logs_asserter.rs), the
+    // TODO here is to write a test that validates the entire payload.
+
     use super::*;
     use integration_test_runner::logs_asserter::{read_logs_from_json, LogsAsserter};
+    use integration_test_runner::test_utils;
+    use opentelemetry_appender_tracing::layer;
     use opentelemetry_appender_tracing::layer::OpenTelemetryTracingBridge;
     use std::{fs::File, time::Duration};
     use tracing::info;
     use tracing_subscriber::layer::SubscriberExt;
+    use uuid::Uuid;
 
     #[test]
     #[should_panic(expected = "assertion `left == right` failed: body does not match")]
@@ -68,41 +78,50 @@ mod logtests {
     }
 
     #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
-    #[cfg(not(feature = "hyper-client"))]
-    #[cfg(not(feature = "reqwest-client"))]
-    pub async fn test_logs() -> Result<()> {
-        // Make sure the container is running
+    #[cfg(any(feature = "tonic-client", feature = "reqwest-blocking-client"))]
+    pub async fn logs_batch_tokio_multi_thread() -> Result<()> {
+        logs_batch_tokio_helper().await
+    }
+
+    #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+    #[cfg(any(feature = "tonic-client", feature = "reqwest-blocking-client"))]
+    pub async fn logs_batch_tokio_multi_with_one_worker() -> Result<()> {
+        logs_batch_tokio_helper().await
+    }
 
-        use integration_test_runner::test_utils;
-        use opentelemetry_appender_tracing::layer;
-        use tracing::info;
-        use tracing_subscriber::layer::SubscriberExt;
+    #[tokio::test(flavor = "current_thread")]
+    #[cfg(any(feature = "tonic-client", feature = "reqwest-blocking-client"))]
+    pub async fn logs_batch_tokio_current() -> Result<()> {
+        logs_batch_tokio_helper().await
+    }
 
+    async fn logs_batch_tokio_helper() -> Result<()> {
         use crate::{assert_logs_results, init_logs};
         test_utils::start_collector_container().await?;
 
         let logger_provider = init_logs().unwrap();
-        let layer = layer::OpenTelemetryTracingBridge::new(&logger_provider);
+        let layer = OpenTelemetryTracingBridge::new(&logger_provider);
         let subscriber = tracing_subscriber::registry().with(layer);
+        // generate a random uuid and store it to expected guid
+        let expected_uuid = Uuid::new_v4().to_string();
         {
             let _guard = tracing::subscriber::set_default(subscriber);
-            info!(target: "my-target", "hello from {}. My price is {}.", "banana", 2.99);
+            info!(target: "my-target",  uuid = expected_uuid, "hello from {}. My price is {}.", "banana", 2.99);
         }
-        // TODO: remove below wait before calling logger_provider.shutdown()
-        // tokio::time::sleep(Duration::from_secs(10)).await;
-        let _ = logger_provider.shutdown();
-
-        tokio::time::sleep(Duration::from_secs(10)).await;
-
-        assert_logs_results(test_utils::LOGS_FILE, "expected/logs.json")?;
 
+        let _ = logger_provider.shutdown();
+        tokio::time::sleep(Duration::from_secs(5)).await;
+        assert_logs_results(test_utils::LOGS_FILE, expected_uuid.as_str())?;
         Ok(())
     }
 
-    #[ignore = "TODO: [Fix Me] Failing on CI. Needs to be investigated and resolved."]
     #[test]
     #[cfg(any(feature = "tonic-client", feature = "reqwest-blocking-client"))]
     pub fn logs_batch_non_tokio_main() -> Result<()> {
+        logs_batch_non_tokio_helper()
+    }
+
+    fn logs_batch_non_tokio_helper() -> Result<()> {
         // Initialize the logger provider inside a tokio runtime
         // as this allows tonic client to capture the runtime,
         // but actual export occurs from the dedicated std::thread
@@ -113,29 +132,28 @@ mod logtests {
             test_utils::start_collector_container().await?;
             init_logs()
         })?;
-
-        info!("LoggerProvider created");
-        let layer = OpenTelemetryTracingBridge::new(&logger_provider);
+        let layer = layer::OpenTelemetryTracingBridge::new(&logger_provider);
         let subscriber = tracing_subscriber::registry().with(layer);
+        // generate a random uuid and store it to expected guid
+        let expected_uuid = Uuid::new_v4().to_string();
         {
             let _guard = tracing::subscriber::set_default(subscriber);
-            info!(target: "my-target", "hello from {}. My price is {}.", "banana", 2.99);
+            info!(target: "my-target",  uuid = expected_uuid, "hello from {}. My price is {}.", "banana", 2.99);
         }
-        let _ = logger_provider.shutdown();
-        // tokio::time::sleep(Duration::from_secs(10)).await;
-        assert_logs_results(test_utils::LOGS_FILE, "expected/logs.json")?;
 
+        let _ = logger_provider.shutdown();
+        std::thread::sleep(Duration::from_secs(5));
+        assert_logs_results(test_utils::LOGS_FILE, expected_uuid.as_str())?;
         Ok(())
     }
 }
 
-pub fn assert_logs_results(result: &str, expected: &str) -> Result<()> {
-    let left = read_logs_from_json(File::open(expected)?)?;
-    let right = read_logs_from_json(File::open(result)?)?;
-
-    LogsAsserter::new(left, right).assert();
-
-    assert!(File::open(result).unwrap().metadata().unwrap().size() > 0);
+pub fn assert_logs_results(result: &str, expected_content: &str) -> Result<()> {
+    let file = File::open(result)?;
+    let mut contents = String::new();
+    let mut reader = std::io::BufReader::new(&file);
+    reader.read_to_string(&mut contents)?;
+    assert!(contents.contains(expected_content));
     Ok(())
 }
 

opentelemetry-otlp/tests/integration_test/tests/metrics.rs

@@ -191,7 +191,7 @@ pub fn validate_metrics_against_results(scope_name: &str) -> Result<()> {
 #[cfg(test)]
 #[cfg(not(feature = "hyper-client"))]
 #[cfg(not(feature = "reqwest-client"))]
-mod tests {
+mod metrictests {
 
     use super::*;
     use opentelemetry::metrics::MeterProvider;
@@ -246,7 +246,6 @@ mod tests {
     }
 
     #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
-    // #[ignore] // skip when running unit test
     async fn test_histogram() -> Result<()> {
         _ = setup_metrics_test().await;
         const METER_NAME: &str = "test_histogram_meter";
@@ -263,7 +262,6 @@ mod tests {
     }
 
     #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
-    // #[ignore] // skip when running unit test
     async fn test_up_down_counter() -> Result<()> {
         _ = setup_metrics_test().await;
         const METER_NAME: &str = "test_up_down_meter";

opentelemetry-sdk/CHANGELOG.md

@@ -58,8 +58,7 @@
    **`experimental_metrics_periodicreader_with_async_runtime`**.
 
    Migration Guide:
-
- 1. *Default Implementation, requires no async runtime* (**Recommended**) The
+   1. *Default Implementation, requires no async runtime* (**Recommended**) The
     new default implementation does not require a runtime argument. Replace the
     builder method accordingly:
     - *Before:*
@@ -71,18 +70,28 @@
       let reader = opentelemetry_sdk::metrics::PeriodicReader::builder(exporter).build();
       ```
 
+    The new PeriodicReader can be used with OTLP Exporter, and supports
+    following exporter features:
+    - `grpc-tonic`: This requires `MeterProvider` to be created within a tokio
+      runtime.
+    - `reqwest-blocking-client`: Works with a regular `main` or `tokio::main`.
+
+    In other words, other clients like `reqwest` and `hyper` are not supported.
+
  2. *Async Runtime Support*
     If your application cannot spin up new threads or you prefer using async
     runtimes, enable the
     "experimental_metrics_periodicreader_with_async_runtime" feature flag and
     adjust code as below.
 
     - *Before:*
+
       ```rust
       let reader = opentelemetry_sdk::metrics::PeriodicReader::builder(exporter, runtime::Tokio).build();
       ```
 
     - *After:*
+
       ```rust
       let reader = opentelemetry_sdk::metrics::periodic_reader_with_async_runtime::PeriodicReader::builder(exporter, runtime::Tokio).build();
       ```
@@ -107,8 +116,7 @@
 - Upgrade the tracing crate used for internal logging to version 0.1.40 or later. This is necessary because the internal logging macros utilize the name field as
 metadata, a feature introduced in version 0.1.40. [#2418](https://github.com/open-telemetry/opentelemetry-rust/pull/2418)
 
-- **Breaking** [#2436](https://github.com/open-telemetry/opentelemetry-rust/pull/2436)
-
+- *Breaking* - `BatchLogProcessor` Updates [#2436](https://github.com/open-telemetry/opentelemetry-rust/pull/2436)
   `BatchLogProcessor` no longer requires an async runtime by default. Instead, a dedicated
   background thread is created to do the batch processing and exporting.
 
@@ -120,33 +128,45 @@ metadata, a feature introduced in version 0.1.40. [#2418](https://github.com/ope
     new default implementation does not require a runtime argument. Replace the
     builder method accordingly:
     - *Before:*
+
       ```rust
       let logger_provider = LoggerProvider::builder()
         .with_log_processor(BatchLogProcessor::builder(exporter, runtime::Tokio).build())
         .build();
       ```
 
     - *After:*
+
       ```rust
       let logger_provider = LoggerProvider::builder()
         .with_log_processor(BatchLogProcessor::builder(exporter).build())
         .build();
       ```
 
+    The new BatchLogProcessor can be used with OTLP Exporter, and supports
+    following exporter features:
+    - `grpc-tonic`: This requires `MeterProvider` to be created within a tokio
+      runtime.
+    - `reqwest-blocking-client`: Works with a regular `main` or `tokio::main`.
+
+    In other words, other clients like `reqwest` and `hyper` are not supported.
+
  2. *Async Runtime Support*
     If your application cannot spin up new threads or you prefer using async
     runtimes, enable the
     "experimental_logs_batch_log_processor_with_async_runtime" feature flag and
     adjust code as below.
 
     - *Before:*
+
       ```rust
       let logger_provider = LoggerProvider::builder()
         .with_log_processor(BatchLogProcessor::builder(exporter, runtime::Tokio).build())
         .build();
       ```
 
     - *After:*
+
       ```rust
       let logger_provider = LoggerProvider::builder()
         .with_log_processor(log_processor_with_async_runtime::BatchLogProcessor::builder(exporter, runtime::Tokio).build())
@@ -159,7 +179,7 @@ metadata, a feature introduced in version 0.1.40. [#2418](https://github.com/ope
     - Continue enabling one of the async runtime feature flags: `rt-tokio`,
       `rt-tokio-current-thread`, or `rt-async-std`.
 
-- **Breaking** [#2456](https://github.com/open-telemetry/opentelemetry-rust/pull/2456)
+- *Breaking* - `BatchSpanProcessor` Updates [#2435](https://github.com/open-telemetry/opentelemetry-rust/pull/2456)
 
   `BatchSpanProcessor` no longer requires an async runtime by default. Instead, a dedicated
   background thread is created to do the batch processing and exporting.
@@ -172,33 +192,45 @@ metadata, a feature introduced in version 0.1.40. [#2418](https://github.com/ope
     new default implementation does not require a runtime argument. Replace the
     builder method accordingly:
     - *Before:*
+
       ```rust
       let tracer_provider = TracerProvider::builder()
         .with_span_processor(BatchSpanProcessor::builder(exporter, runtime::Tokio).build())
         .build();
       ```
 
     - *After:*
+
       ```rust
       let tracer_provider = TracerProvider::builder()
         .with_span_processor(BatchSpanProcessor::builder(exporter).build())
         .build();
       ```
 
+    The new BatchLogProcessor can be used with OTLP Exporter, and supports
+    following exporter features:
+    - `grpc-tonic`: This requires `MeterProvider` to be created within a tokio
+      runtime.
+    - `reqwest-blocking-client`: Works with a regular `main` or `tokio::main`.
+
+    In other words, other clients like `reqwest` and `hyper` are not supported.
+
  2. *Async Runtime Support*
     If your application cannot spin up new threads or you prefer using async
     runtimes, enable the
     "experimental_trace_batch_span_processor_with_async_runtime" feature flag and
     adjust code as below.
 
     - *Before:*
+
       ```rust
       let tracer_provider = TracerProvider::builder()
         .with_span_processor(BatchSpanProcessor::builder(exporter, runtime::Tokio).build())
         .build();
       ```
 
     - *After:*
+
       ```rust
       let tracer_provider = TracerProvider::builder()
         .with_span_processor(span_processor_with_async_runtime::BatchSpanProcessor::builder(exporter, runtime::Tokio).build())