docs: Revive 0.35 examples

Cargo.toml

@@ -58,6 +58,7 @@ testresult = "0.4.1"
 tracing-subscriber = { version = "0.3.19", features = ["fmt"] }
 tracing-test = "0.2.5"
 walkdir = "2.5.0"
+iroh = { version = "0.90", features = ["discovery-local-network"]}
 
 [features]
 hide-proto-docs = []

examples/common/mod.rs

@@ -0,0 +1,35 @@
+#![allow(dead_code)]
+use anyhow::Result;
+use iroh::SecretKey;
+use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt, EnvFilter};
+
+/// Gets a secret key from the IROH_SECRET environment variable or generates a new random one.
+/// If the environment variable is set, it must be a valid string representation of a secret key.
+pub fn get_or_generate_secret_key() -> Result<SecretKey> {
+    use std::{env, str::FromStr};
+
+    use anyhow::Context;
+    use rand::thread_rng;
+    if let Ok(secret) = env::var("IROH_SECRET") {
+        // Parse the secret key from string
+        SecretKey::from_str(&secret).context("Invalid secret key format")
+    } else {
+        // Generate a new random key
+        let secret_key = SecretKey::generate(&mut thread_rng());
+        println!(
+            "Generated new secret key: {}",
+            hex::encode(secret_key.to_bytes())
+        );
+        println!("To reuse this key, set the IROH_SECRET environment variable to this value");
+        Ok(secret_key)
+    }
+}
+
+// set the RUST_LOG env var to one of {debug,info,warn} to see logging info
+pub fn setup_logging() {
+    tracing_subscriber::registry()
+        .with(tracing_subscriber::fmt::layer().with_writer(std::io::stderr))
+        .with(EnvFilter::from_default_env())
+        .try_init()
+        .ok();
+}