feat: add thiserror for error handling

src/bin/cli/main.rs

@@ -2,6 +2,7 @@
 
 use clap::{Parser, Subcommand};
 use futures::TryStreamExt;
+use simple_crud::error::Result;
 use simple_crud::sql::ColumnType;
 use sqlx::postgres::PgPool;
 use sqlx::Column;
@@ -21,7 +22,7 @@ struct Cli {
 
 #[derive(Subcommand)]
 enum Commands {
-    /// Executes a query agains the database, it pass it directly to the underliying driver
+    /// Executes a query against the database, it pass it directly to the underlying driver
     Query {
         /// Query to execute
         sql: String,
@@ -29,7 +30,7 @@ enum Commands {
 }
 
 #[tokio::main]
-async fn main() {
+async fn main() -> Result<()> {
     let cli = Cli::parse();
 
     let url = cli.db_url.unwrap();
@@ -37,18 +38,20 @@ async fn main() {
     // You can check for the existence of subcommands, and if found use their
     // matches just as you would the top level cmd
     match &cli.command {
-        Commands::Query { sql } => handle_query(url, sql).await.unwrap(),
+        Commands::Query { sql } => handle_query(url, sql).await?,
     }
+
+    Ok(())
 }
 
-async fn handle_query(url: String, query: &String) -> Result<(), sqlx::Error> {
+async fn handle_query(url: String, query: &String) -> Result<()> {
     let pool = PgPool::connect(url.as_str()).await?;
 
     let mut rows = sqlx::query(query.as_str()).fetch(&pool);
 
     while let Some(row) = rows.try_next().await? {
         for idx in 0..row.len() {
-            let column = ColumnType::new(&row, idx).unwrap();
+            let column = ColumnType::new(&row, idx)?;
             // let value = String::from(row.get(col.ordinal()));
             println!("Column {:?}", column);
         }

src/error.rs

@@ -1 +1,16 @@
-pub type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
+pub type Result<T> = std::result::Result<T, Error>;
+
+#[derive(thiserror::Error, Debug)]
+pub enum Error {
+    #[error("Unhandled error: {0}")]
+    Generic(String),
+
+    #[error("Unhandled error: {0}")]
+    Static(&'static str),
+
+    #[error(transparent)]
+    IO(#[from] std::io::Error),
+
+    #[error("Error performing database operation.")]
+    DatabaseOperation(#[from] sqlx::Error),
+}