Propagate errors from token reading from file

src/api_client.rs

@@ -1,3 +1,5 @@
+use std::process;
+
 use reqwest::Url;
 use serde_json::Value;
 
@@ -12,7 +14,10 @@ pub struct ApiClient {
 impl ApiClient {
     pub fn new() -> Self {
         Self {
-            api_key: token::read_api_key(),
+            api_key: token::read_api_key().unwrap_or_else(|err| {
+                eprintln!("Unable to read from '.token' file");
+                process::exit(1);
+            }),
             base_uri: String::from("https://www.virustotal.com/api/v3"),
             client: reqwest::blocking::Client::new(),
         }

src/api_client/token.rs

@@ -1,7 +1,8 @@
+use std::io;
 use std::fs::read_to_string;
 
-pub fn read_api_key() -> String {
-    let api_key = read_to_string(".token").expect("Unable to read from '.token' file");
+pub fn read_api_key() -> io::Result<String> {
+    let api_key = read_to_string(".token")?;
 
-    api_key.trim().to_string()
+    Ok(api_key.trim().to_string())
 }