add conditional put

http-client/src/api.rs

@@ -27,8 +27,14 @@ pub async fn fetch_account(host: &str, nr: &str) -> Result<JsonAccount, FetchErr
     }
 }
 
-pub async fn set_balance(host: &str, nr: &str, balance: f64) -> Result<(), FetchError> {
+pub async fn set_balance(
+    host: &str,
+    nr: &str,
+    balance: f64,
+    etag: String,
+) -> Result<(), FetchError> {
     let data = JsValue::from_str(&format!("amount={}", balance));
-    client::put(&format! {"{}/accounts/{}", host, nr}, data).await?;
+    client::put(&format! {"{}/accounts/{}", host, nr}, data, Some(etag)).await?;
+
     Ok(())
 }

http-client/src/client.rs

@@ -53,7 +53,7 @@ pub async fn get_json(url: &str) -> Result<Option<String>, FetchError> {
     Ok(text.as_string())
 }
 
-pub async fn put(url: &str, data: JsValue) -> Result<(), FetchError> {
+pub async fn put(url: &str, data: JsValue, if_match: Option<String>) -> Result<(), FetchError> {
     let mut opts = RequestInit::new();
     opts.method("PUT");
     opts.mode(RequestMode::Cors);
@@ -63,6 +63,11 @@ pub async fn put(url: &str, data: JsValue) -> Result<(), FetchError> {
     request
         .headers()
         .set("Content-Type", "application/x-www-form-urlencoded")?;
+
+    if let Some(etag) = if_match {
+        request.headers().set("If-match", &etag)?;
+    }
+
     self::send_request(request).await?;
 
     Ok(())

http-client/src/components/main.rs

@@ -77,8 +77,17 @@ impl Component for Main {
                 true
             }
             Event::SetBalance(balance, nr) => {
+                let acc = bank::account::Account {
+                    number: nr.clone(),
+                    owner: self.selected_owner.clone(),
+                    balance: self.selected_balance,
+                    is_active: true,
+                };
+
+                let hash = acc.hash_string();
+
                 ctx.link().send_future(async move {
-                    match api::set_balance("http://localhost:8000", &nr, balance).await {
+                    match api::set_balance("http://localhost:8000", &nr, balance, hash).await {
                         Err(e) => Event::ShowError(e.to_string()),
                         Ok(_) => Event::SelectAccountNr(nr),
                     }