langfuse-ergonomic 0.6.3

Ergonomic Rust client for Langfuse with builder patterns
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49

use langfuse_ergonomic::ClientBuilder;
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Load environment variables
    dotenvy::dotenv().ok();

    // Create client from environment variables
    println!("Creating Langfuse client from environment...");
    let client = ClientBuilder::from_env()?.build()?;

    println!(" Client created successfully");

    // Create a simple trace
    println!("Creating trace...");
    let trace_response = client
        .trace()
        .name("test-trace-from-rust")
        .input(json!({
            "prompt": "What is the capital of France?",
            "max_tokens": 50
        }))
        .output(json!({
            "response": "The capital of France is Paris.",
            "tokens_used": 10
        }))
        .tags(vec![
            "test".to_string(),
            "rust-client".to_string(),
            "example".to_string(),
        ])
        .user_id("test-user-123")
        .session_id("test-session-456")
        .metadata(json!({
            "environment": "testing",
            "sdk": "langfuse-rs",
            "version": "0.1.0"
        }))
        .call()
        .await?;

    println!(" Trace created successfully!");
    println!("   Trace ID: {}", trace_response.id);
    println!("\n Check your Langfuse dashboard at https://cloud.langfuse.com");
    println!("   You should see a trace named 'test-trace-from-rust'");

    Ok(())
}