add a debug config for VS Code and propagate errors

Author: Ilia Zyrin

.vscode/launch.json

@@ -0,0 +1,45 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug executable 'eva01'",
+            "cargo": {
+                "args": [
+                    "build",
+                    "--bin=eva01",
+                    "--package=eva01"
+                ],
+                "filter": {
+                    "name": "eva01",
+                    "kind": "bin"
+                }
+            },
+            "args": ["run", "cfg.toml"],
+            "cwd": "${workspaceFolder}"
+        },
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug unit tests in executable 'eva01'",
+            "cargo": {
+                "args": [
+                    "test",
+                    "--no-run",
+                    "--bin=eva01",
+                    "--package=eva01"
+                ],
+                "filter": {
+                    "name": "eva01",
+                    "kind": "bin"
+                }
+            },
+            "args": [],
+            "cwd": "${workspaceFolder}"
+        }
+    ]
+}

src/cli/mod.rs

@@ -17,7 +17,7 @@ pub async fn main_entry() -> anyhow::Result<()> {
 
     match args.cmd {
         app::Commands::Run { path } => {
-            let config = Eva01Config::try_load_from_file(path).unwrap();
+            let config = Eva01Config::try_load_from_file(path)?;
             entrypoints::run_liquidator(config).await?;
         }
         app::Commands::Setup => {

src/config.rs

@@ -10,7 +10,6 @@ use fixed::types::I80F48;
 use fixed_macro::types::I80F48;
 use solana_sdk::{pubkey, pubkey::Pubkey};
 use std::{
-    error::Error,
     io::{BufWriter, Write},
     path::PathBuf,
 };
@@ -25,11 +24,11 @@ pub struct Eva01Config {
 }
 
 impl Eva01Config {
-    pub fn try_load_from_file(path: PathBuf) -> Result<Self, Box<dyn Error>> {
+    pub fn try_load_from_file(path: PathBuf) -> anyhow::Result<Self> {
         let config_str = std::fs::read_to_string(path)
-            .map_err(|e| format!("Failed to read config file: {:?}", e))?;
+            .map_err(|e| anyhow::anyhow!("Failed to read config file: {:#?}", e))?;
         let config = toml::from_str(&config_str)
-            .map_err(|e| format!("Failed to parse config file {:?}", e))?;
+            .map_err(|e| anyhow::anyhow!("Failed to parse config file {:#?}", e))?;
         Ok(config)
     }