examples: Remove all unwrap()s.

xmpp-parsers/examples/generate-caps.rs

@@ -12,7 +12,7 @@ use xmpp_parsers::{
     disco::DiscoInfoResult,
     ecaps2::{compute_disco as compute_disco_ecaps2, hash_ecaps2, ECaps2},
     hashes::Algo,
-    Element,
+    Element, Error,
 };
 
 fn get_caps(disco: &DiscoInfoResult, node: String) -> Result<Caps, String> {
@@ -21,18 +21,18 @@ fn get_caps(disco: &DiscoInfoResult, node: String) -> Result<Caps, String> {
     Ok(Caps::new(node, caps_hash))
 }
 
-fn get_ecaps2(disco: &DiscoInfoResult) -> Result<ECaps2, String> {
-    let ecaps2_data = compute_disco_ecaps2(&disco).unwrap();
+fn get_ecaps2(disco: &DiscoInfoResult) -> Result<ECaps2, Error> {
+    let ecaps2_data = compute_disco_ecaps2(&disco)?;
     let ecaps2_sha256 = hash_ecaps2(&ecaps2_data, Algo::Sha_256)?;
     let ecaps2_sha3_256 = hash_ecaps2(&ecaps2_data, Algo::Sha3_256)?;
     Ok(ECaps2::new(vec![ecaps2_sha256, ecaps2_sha3_256]))
 }
 
-fn main() -> Result<(), ()> {
+fn main() -> Result<(), Box<dyn std::error::Error>> {
     let args: Vec<_> = env::args().collect();
     if args.len() != 2 {
         println!("Usage: {} <node>", args[0]);
-        return Err(());
+        std::process::exit(1);
     }
     let node = args[1].clone();
 
@@ -42,15 +42,15 @@ fn main() -> Result<(), ()> {
     let stdin = io::stdin();
     let mut data = String::new();
     let mut handle = stdin.lock();
-    handle.read_to_string(&mut data).unwrap();
+    handle.read_to_string(&mut data)?;
 
     // Parse the payload into a DiscoInfoResult.
-    let elem: Element = data.parse().unwrap();
-    let disco = DiscoInfoResult::try_from(elem).unwrap();
+    let elem: Element = data.parse()?;
+    let disco = DiscoInfoResult::try_from(elem)?;
 
     // Compute both kinds of caps.
-    let caps = get_caps(&disco, node).unwrap();
-    let ecaps2 = get_ecaps2(&disco).unwrap();
+    let caps = get_caps(&disco, node)?;
+    let ecaps2 = get_ecaps2(&disco)?;
 
     // Print them.
     let caps_elem = Element::from(caps);