refactor: move describe_table_api to control

API should be called in control

src/app.rs

@@ -455,7 +455,7 @@ pub async fn use_table(
             debug!("describing the table: {}", tbl);
             let region = cx.effective_region();
             let tbl = tbl.clone();
-            let desc: TableDescription = describe_table_api(&region, tbl.clone()).await;
+            let desc: TableDescription = control::describe_table_api(&region, tbl.clone()).await;
             save_using_target(cx, desc)?;
             println!("Now you're using the table '{}' ({}).", tbl, &region.name());
         },
@@ -568,7 +568,7 @@ pub async fn table_schema(cx: &Context) -> TableSchema {
         // It's possible that users pass --table without calling `dy use` for any table. Thus collect all data from DescribeTable results.
         Some(table_name) => {
             // TODO: reduce # of DescribeTable API calls. table_schema function is called every time you do something.
-            let desc: TableDescription = describe_table_api(
+            let desc: TableDescription = control::describe_table_api(
                 &cx.effective_region(),
                 table_name, /* should be equal to 'cx.effective_table_name()' */
             )
@@ -638,26 +638,6 @@ pub fn index_schemas(desc: &TableDescription) -> Option<Vec<IndexSchema>> {
     }
 }
 
-/// Originally intended to be called by describe_table function, which is called from `$ dy desc`,
-/// however it turned out that DescribeTable API result is useful in various logic, separated API into this standalone function.
-pub async fn describe_table_api(region: &Region, table_name: String) -> TableDescription {
-    let ddb = DynamoDbClient::new(region.clone());
-    let req: DescribeTableInput = DescribeTableInput { table_name };
-
-    match ddb.describe_table(req).await {
-        Err(e) => {
-            debug!("DescribeTable API call got an error -- {:#?}", e);
-            error!("{}", e.to_string());
-            std::process::exit(1);
-        }
-        Ok(res) => {
-            let desc: TableDescription = res.table.expect("This message should not be shown.");
-            debug!("Received DescribeTable Result: {:?}\n", desc);
-            desc
-        }
-    }
-}
-
 pub fn bye(code: i32, msg: &str) {
     println!("{}", msg);
     std::process::exit(code);

src/bootstrap.rs

@@ -419,7 +419,7 @@ async fn wait_table_creation(cx: &app::Context, mut processing_tables: Vec<&str>
         let create_table_results = join_all(
             processing_tables
                 .iter()
-                .map(|t| app::describe_table_api(r, (*t).to_string())),
+                .map(|t| control::describe_table_api(r, (*t).to_string())),
         )
         .await;
         let statuses: Vec<String> = create_table_results

src/control.rs

@@ -176,7 +176,7 @@ pub async fn describe_table(cx: app::Context, target_table_to_desc: Option<Strin
         cx
     };
 
-    let desc: TableDescription = app::describe_table_api(
+    let desc: TableDescription = describe_table_api(
         &new_context.effective_region(),
         new_context.effective_table_name(),
     )
@@ -207,6 +207,26 @@ pub async fn describe_table(cx: app::Context, target_table_to_desc: Option<Strin
     }
 }
 
+/// Originally intended to be called by describe_table function, which is called from `$ dy desc`,
+/// however it turned out that DescribeTable API result is useful in various logic, separated API into this standalone function.
+pub async fn describe_table_api(region: &Region, table_name: String) -> TableDescription {
+    let ddb = DynamoDbClient::new(region.clone());
+    let req: DescribeTableInput = DescribeTableInput { table_name };
+
+    match ddb.describe_table(req).await {
+        Err(e) => {
+            debug!("DescribeTable API call got an error -- {:#?}", e);
+            error!("{}", e.to_string());
+            std::process::exit(1);
+        }
+        Ok(res) => {
+            let desc: TableDescription = res.table.expect("This message should not be shown.");
+            debug!("Received DescribeTable Result: {:?}\n", desc);
+            desc
+        }
+    }
+}
+
 /// Receives region (just to show in one line for reference) and TableDescription,
 /// print them in readable YAML format. NOTE: '~' representes 'null' or 'no value' in YAML syntax.
 pub fn print_table_description(region: Region, desc: TableDescription) {
@@ -341,7 +361,7 @@ pub async fn update_table(
 ) {
     // Retrieve TableDescription of the table to update, current (before update) status.
     let desc: TableDescription =
-        app::describe_table_api(&cx.effective_region(), table_name_to_update.clone()).await;
+        describe_table_api(&cx.effective_region(), table_name_to_update.clone()).await;
 
     // Map given string into "Mode" enum. Note that in cmd.rs structopt already limits acceptable values.
     let switching_to_mode: Option<Mode> = match mode_string {