opentelemetry-gcloud-trace-rs

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opentelemetry-gcloud-trace-rs

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OpenTelemetry support for Google Cloud Trace for Rust

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# OpenTelemetry support for Google Cloud Trace

## Quick start

Cargo.toml:
```toml
[dependencies]
opentelemetry-gcloud-trace = "0.24"
```

### Crypto provider error

Depends on your other dependencies you may see the error like:

```
no process-level CryptoProvider available -- call CryptoProvider::install_default() before this point 
```

This is because the TLS providers are not installed by default and you can choose different.
The easiest way to fix is just to include one of the provider, for example:

```toml
[dependencies]
rustls = "0.23"
```

If you have multiple you may need to call `CryptoProvider::install_default()` before using the Firestore client.

```rust
rustls::crypto::ring::default_provider().install_default().expect("Failed to install rustls crypto provider");
```

## Compatibility matrix

| opentelemetry-gcloud-trace version | opentelemetry version | tracing-opentelemetry | gcloud-sdk |
|------------------------------------|-----------------------|-----------------------|------------|
| 0.24                               | 0.32                  | 0.33                  | 0.30       |
| 0.23                               | 0.31                  | 0.32                  | 0.29       |
| 0.22                               | 0.31                  | 0.32                  | 0.28       |
| 0.21                               | 0.30                  | 0.31                  | 0.28       |
| 0.20                               | 0.30                  | 0.31                  | 0.27       |

Example:

```rust

let gcp_trace_exporter = GcpCloudTraceExporterBuilder::for_default_project_id().await?; // or GcpCloudTraceExporterBuilder::new(config_env_var("PROJECT_ID")?)

let tracer_provider = gcp_trace_exporter.create_provider().await?;
let tracer: opentelemetry_sdk::trace::Tracer = gcp_trace_exporter.install(&tracer_provider).await?;

opentelemetry::global::set_tracer_provider(tracer_provider.clone());

tracer.in_span("doing_work_parent", |cx| {
  // ...
});

tracer_provider.shutdown()?;

```

All examples are available at [examples](examples) directory.

To run an example use with environment variables:
```
# PROJECT_ID=<your-google-project-id> cargo run --example enable-exporter
```

![Google Cloud Console Example](https://raw.githubusercontent.com/abdolence/opentelemetry-gcloud-trace-rs/master/docs/img/gcloud-example.png)

```toml
[dependencies]
opentelemetry = { version = "*", features = [] }
opentelemetry_sdk = { version = "*", features = ["rt-tokio"] }
opentelemetry-gcloud-trace = "*"
```

### Crypto provider error

Depends on your other dependencies you may see the error like:

```
no process-level CryptoProvider available -- call CryptoProvider::install_default() before this point 
```

This is because the TLS providers are not installed by default and you can choose different.
The easiest way to fix is just to include one of the provider, for example:

```toml
[dependencies]
rustls = "0.23"
```

If you have multiple you may need to call `CryptoProvider::install_default()` before using the Firestore client.

```rust
rustls::crypto::ring::default_provider().install_default().expect("Failed to install rustls crypto provider");
```

## Configuration

You can specify trace configuration using `with_tracer_provider_builder`:

```rust
   let exporter = GcpCloudTraceExporterBuilder::new(google_project_id);
   let provider = exporter.create_provider_from_builder ( TracerProvider::builder()
         .with_sampler(Sampler::AlwaysOn)
         .with_id_generator(RandomIdGenerator::default())
   ));
```

## Limitations
- This exporter doesn't support any other runtimes except Tokio.

## Integration with logs
This crate intentionally doesn't export logs using API to avoid duplicate logs on GKE/GCE environments. 
You can use this crate in combination with `tracing-stackdriver` crate to produce 
JSON formatted logs and logs and traces will be correlated by `trace_id` and `span_id` 
fields automatically. 
 
This is an example of this kind of configuration:
```rust

fn init_console_log(
    tracer: opentelemetry_sdk::trace::Tracer,
) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    let telemetry = tracing_opentelemetry::layer().with_tracer(tracer);

let subscriber = tracing_subscriber::registry::Registry::default()
        .with(tracing_subscriber::fmt::layer())
        .with(tracing_subscriber::EnvFilter::from_str(
            "gcloud_sdk=debug",
        )?)
        .with(telemetry);

tracing::subscriber::set_global_default(subscriber)?;

Ok(())
}

fn init_stackdriver_log(
    gcp_project_id: &str,
    tracer: opentelemetry_sdk::trace::Tracer,
) -> Result<(), BoxedError> {
    let telemetry_layer = tracing_opentelemetry::layer().with_tracer(tracer);

let stackdriver_layer = tracing_stackdriver::layer().with_cloud_trace(
        tracing_stackdriver::CloudTraceConfiguration {
            project_id: gcp_project_id.to_string(),
        },
    );

let subscriber = tracing_subscriber::Registry::default()
        .with(telemetry_layer)
        .with(stackdriver_layer)
        .with(tracing_subscriber::EnvFilter::from_str(
            "gcloud_sdk=debug",
        )?);
    tracing::subscriber::set_global_default(subscriber)
        .expect("Could not set up global logger");

Ok(())
}

async fn init_tracing(app_mode: &GlobalAppMode,
                      tracer: GcpCloudTraceExporter,
                      gcp_project_id: &str) -> Result<(), BoxedError> {
    match app_mode {
        GlobalAppMode::Production => init_stackdriver_log(gcp_project_id, tracer),
        GlobalAppMode::Development => init_console_log(tracer),
    }
}

#[tokio::main]
async fn main() -> Result<(), BoxedError> {
    let gcp_project_id = "my-gcp-project-id";
    let exporter = GcpCloudTraceExporterBuilder::new(gcp_project_id.into());
    let tracer_provider = gcp_trace_exporter.create_provider().await?;
    let tracer: opentelemetry_sdk::trace::Tracer = gcp_trace_exporter.install(&tracer_provider).await?;
    let app_mode = GlobalAppMode::Development;

opentelemetry::global::set_tracer_provider(tracer_provider.clone());
    
    init_tracing(&app_mode, tracer, gcp_project_id).await?;
    
    // ...

tracer_provider.shutdown()?;
}

```

## TLS related features
Cargo provides support for different TLS features for dependencies:
- `tls-roots`: default feature to support native TLS roots
- `tls-webpki-roots`: feature to switch to webpki crate roots

## Licence
Apache Software License (ASL)

## Author
Abdulla Abdurakhmanov

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