feat: improve error handling and messages

src/bin/cli/main.rs

@@ -2,6 +2,7 @@
 
 use clap::{Parser, Subcommand};
 use futures::TryStreamExt;
+use simple_crud::error::Error;
 use simple_crud::error::Result;
 use simple_crud::sql::ColumnType;
 use sqlx::postgres::PgPool;
@@ -33,12 +34,21 @@ enum Commands {
 async fn main() -> Result<()> {
     let cli = Cli::parse();
 
-    let url = cli.db_url.unwrap();
+    let url = match cli.db_url {
+        Some(url) => url,
+        None => {
+            panic!("{}", Error::Runtime("No db_url provided."));
+        }
+    };
 
     // 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?,
+    let result = match &cli.command {
+        Commands::Query { sql } => handle_query(url, sql).await,
+    };
+
+    if let Err(err) = result {
+        panic!("{}", err);
     }
 
     Ok(())

src/error.rs

@@ -11,6 +11,12 @@ pub enum Error {
     #[error(transparent)]
     IO(#[from] std::io::Error),
 
-    #[error("Error performing database operation.")]
+    #[error("Error in runtime execution: {0}")]
+    Runtime(&'static str),
+
+    #[error("Error parsing database column type: {0}")]
+    ColumnParse(String),
+
+    #[error(transparent)]
     DatabaseOperation(#[from] sqlx::Error),
 }

src/sql.rs

@@ -5,6 +5,7 @@ use sqlx::Row as _;
 use sqlx::TypeInfo;
 
 use crate::error;
+use crate::error::Error;
 
 #[derive(Debug)]
 pub struct Column<T> {
@@ -28,7 +29,10 @@ pub enum ColumnType {
 
 impl ColumnType {
     pub fn new(row: &PgRow, idx: usize) -> error::Result<Self> {
-        let column = row.columns().get(idx).unwrap();
+        let column = row
+            .columns()
+            .get(idx)
+            .ok_or_else(|| Error::ColumnParse(String::from("Could not get column")))?;
         let sql_type = column.type_info().name();
         let name = String::from(column.name());
 
@@ -106,7 +110,7 @@ impl ColumnType {
                     name,
                 }))
             }
-            &_ => panic!("{} Type not found!", sql_type),
+            &_ => Err(Error::ColumnParse(format!("{} type not found!", sql_type))),
         }
     }
 }