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#include "google/cloud/opentelemetry/configure_basic_tracing.h"
#include "google/cloud/storage/client.h"
#include "google/cloud/opentelemetry_options.h"
#include <iostream>

int main(int argc, char* argv[]) {
  if (argc != 3) {
    std::cerr << "Usage: " << argv[0] << " <bucket-name> <project-id>\n";
    return 1;
  }
  std::string const bucket_name = argv[1];
  std::string const project_id = argv[2];

  // Create aliases to make the code easier to read.
  namespace gc = ::google::cloud;
  namespace gcs = ::google::cloud::storage;

  // Instantiate a basic tracing configuration which exports traces to Cloud
  // Trace. By default, spans are sent in batches and always sampled.
  auto project = gc::Project(project_id);
  auto configuration = gc::otel::ConfigureBasicTracing(project);

  // Create a client with OpenTelemetry tracing enabled.
  auto options = gc::Options{}.set<gc::OpenTelemetryTracingOption>(true);
  auto client = gcs::Client(options);

  auto writer = client.WriteObject(bucket_name, "quickstart.txt");
  writer << "Hello World!";
  writer.Close();
  if (!writer.metadata()) {
    std::cerr << "Error creating object: " << writer.metadata().status()
              << "\n";
    return 1;
  }
  std::cout << "Successfully created object: " << *writer.metadata() << "\n";

  auto reader = client.ReadObject(bucket_name, "quickstart.txt");
  if (!reader) {
    std::cerr << "Error reading object: " << reader.status() << "\n";
    return 1;
  }

  std::string contents{std::istreambuf_iterator<char>{reader}, {}};
  std::cout << contents << "\n";

  // The basic tracing configuration object goes out of scope. The collected
  // spans are flushed to Cloud Trace.

  return 0;
}

public class QuickstartOpenTelemetrySample {
  public static void main(String... args) throws Exception {
    SpanExporter spanExporter = TraceExporter.createWithDefaultConfiguration();
    TextMapPropagator propagators =
        TextMapPropagator.composite(
            W3CTraceContextPropagator.getInstance(),
            new XCloudTraceContextPropagator(/* oneway= */ true));

    OpenTelemetrySdk openTelemetry =
        OpenTelemetrySdk.builder()
            .setPropagators(ContextPropagators.create(propagators))
            .setTracerProvider(
                SdkTracerProvider.builder()
                    // Sample Rate is set to alwaysOn
                    // It is recommended to sample based on a ratio for standard use ie.
                    // .setSampler(Sampler.traceIdRatioBased(0.2)) // sample only 20% of trace ids
                    .setSampler(Sampler.alwaysOn())
                    .addSpanProcessor(BatchSpanProcessor.builder(spanExporter).build())
                    .build())
            .build();
    StorageOptions options = StorageOptions.newBuilder().setOpenTelemetry(openTelemetry).build();
    Storage storage = options.getService();
    System.out.println("Created an instance of storage with OpenTelemetry configured");
  }
}

from opentelemetry import trace
from opentelemetry.exporter.cloud_trace import CloudTraceSpanExporter
from opentelemetry.resourcedetector.gcp_resource_detector import (
    GoogleCloudResourceDetector,
)
from opentelemetry.sdk.trace import TracerProvider
from opentelemetry.sdk.trace.export import BatchSpanProcessor
from opentelemetry.sdk.trace.sampling import ALWAYS_ON
# Optional: Enable traces emitted from the requests HTTP library.
from opentelemetry.instrumentation.requests import RequestsInstrumentor

from google.cloud import storage

# The ID of your GCS bucket
# bucket_name = "your-bucket-name"
# The ID of your GCS object
# blob_name = "your-object-name"
# The contents to upload to the file
# data = "The quick brown fox jumps over the lazy dog."

# In this sample, we use Google Cloud Trace to export the OpenTelemetry
# traces: https://cloud.google.com/trace/docs/setup/python-ot
# Choose and configure the exporter for your environment.

tracer_provider = TracerProvider(
    # Sampling is set to ALWAYS_ON.
    # It is recommended to sample based on a ratio to control trace ingestion volume,
    # for instance, sampler=TraceIdRatioBased(0.2)
    sampler=ALWAYS_ON,
    resource=GoogleCloudResourceDetector().detect(),
)

# Export to Google Cloud Trace.
tracer_provider.add_span_processor(BatchSpanProcessor(CloudTraceSpanExporter()))
trace.set_tracer_provider(tracer_provider)

# Optional: Enable traces emitted from the requests HTTP library.
RequestsInstrumentor().instrument(tracer_provider=tracer_provider)

# Get the tracer and create a new root span.
tracer = tracer_provider.get_tracer("My App")
with tracer.start_as_current_span("trace-quickstart"):
    # Instantiate a storage client and perform a write and read workload.
    storage_client = storage.Client()
    bucket = storage_client.bucket(bucket_name)
    blob = bucket.blob(blob_name)
    blob.upload_from_string(data)
    print(f"{blob_name} uploaded to {bucket_name}.")

    blob.download_as_bytes()
    print("Downloaded storage object {} from bucket {}.".format(blob_name, bucket_name))

use google_cloud_storage::client::Storage;
use opentelemetry::trace::TracerProvider as _;
use tracing_subscriber::Registry;
use tracing_subscriber::layer::SubscriberExt;

pub async fn sample(bucket_id: &str) -> anyhow::Result<()> {
    const NAME: &str = "enable-otel-tracing.txt";

    // Create an OTLP exporter to send spans to an OpenTelemetry Collector
    // running on localhost (the default).
    let exporter = opentelemetry_otlp::SpanExporter::builder()
        .with_tonic()
        .build()?;
    let provider = opentelemetry_sdk::trace::SdkTracerProvider::builder()
        .with_batch_exporter(exporter)
        .build();
    let tracer = provider.tracer("storage-quickstart");

    // Create a tracing layer and register the subscriber for the current scope.
    // In an application's `main`, use `tracing::subscriber::set_global_default` instead.
    let telemetry = tracing_opentelemetry::layer().with_tracer(tracer);
    let subscriber = Registry::default().with(telemetry);
    let _guard = tracing::subscriber::set_default(subscriber);

    // Build a Storage client with client-side tracing enabled.
    let client = Storage::builder().with_tracing().build().await?;

    let object = client
        .write_object(
            format!("projects/_/buckets/{bucket_id}"),
            NAME,
            "Hello, world!",
        )
        .set_if_generation_match(0)
        .send_unbuffered()
        .await?;
    println!("Uploaded object {} to bucket {bucket_id}.", object.name);

    let mut reader = client
        .read_object(format!("projects/_/buckets/{bucket_id}"), NAME)
        .send()
        .await?;
    let mut contents = Vec::new();
    while let Some(chunk) = reader.next().await.transpose()? {
        contents.extend_from_slice(&chunk);
    }
    println!(
        "Downloaded {} bytes from object {NAME} in bucket {bucket_id}.",
        contents.len()
    );

    Ok(())
}