imp(examples): add with-logger example

examples/with-logger.rs

@@ -0,0 +1,41 @@
+// Copyright 2021 Developers of Pyroscope.
+
+// Licensed under the Apache License, Version 2.0 <LICENSE or
+// https://www.apache.org/licenses/LICENSE-2.0>. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+extern crate pyroscope;
+
+use log::{debug, error, info, trace, warn};
+
+use pyroscope::{PyroscopeAgent, Result};
+
+fn fibonacci(n: u64) -> u64 {
+    match n {
+        0 | 1 => 1,
+        n => fibonacci(n - 1) + fibonacci(n - 2),
+    }
+}
+
+fn main() -> Result<()> {
+    // Force rustc to display the log messages in the console.
+    std::env::set_var("RUST_LOG", "trace");
+
+    // Initialize the logger.
+    pretty_env_logger::init_timed();
+
+    info!("With Logger example");
+
+    // Create a new agent.
+    let mut agent = PyroscopeAgent::builder("http://localhost:4040", "example.logger").build()?;
+
+    // Start Agent
+    agent.start()?;
+
+    let _result = fibonacci(47);
+
+    // Stop Agent
+    agent.stop()?;
+
+    Ok(())
+}