Improve demo and error handling

dbt-core/src/main/groovy/com/devsoap/dbt/services/TransactionManagerService.groovy

@@ -31,7 +31,13 @@ class TransactionManagerService implements Service {
         }
 
         def builder = new TransactionBuilder()
+        try{
             queryBuilder.build(builder)
+        } catch (Exception e) {
+            log.error('Failed to build transaction', e)
+            return Promise.error(e)
+        }
+
         def transaction = builder.build()
 
         log.info("Sending transaction $transaction.id to ledger at $config.ledger.remoteUrl")
@@ -39,6 +45,7 @@ class TransactionManagerService implements Service {
             spec.body.text(mapper.writeValueAsString(transaction))
         }).onError {
             log.error("Failed to send transaction $transaction.id to ledger $config.ledger.remoteUrl")
+            return Promise.error(it)
         }.map { response ->
             if(response.status == Status.OK) {
                 mapper.readTree(response.body.text)
@@ -68,7 +75,14 @@ class TransactionManagerService implements Service {
 
             log.info("Updating transaction $transactionId content with new query")
             def builder = new TransactionBuilder(oldTransaction)
+
+            try {
                 queryBuilder.build(builder)
+            } catch (Exception e) {
+                log.error("Failed to update transaction", e)
+                return Promise.error(e)
+            }
+
             def transaction = builder.build()
 
             if(transaction.id != transactionId) {
@@ -80,6 +94,7 @@ class TransactionManagerService implements Service {
                 spec.body.text(mapper.writeValueAsString(transaction))
             }).onError {
                 log.error("Failed to send transaction $transaction.id to ledger $config.ledger.remoteUrl")
+                return Promise.error(it)
             }
         }.map { response ->
             mapper.readTree(response.body.text)
@@ -100,16 +115,21 @@ class TransactionManagerService implements Service {
             this.transaction = transaction
         }
 
-        void query(String sql){
+        TransactionBuilder query(String sql){
+            if(sql == null || sql == '' || sql.trim() == '') {
+                throw new IllegalArgumentException("SQL statement cannot be null")
+            }
             queries << sql
+            this
         }
 
         String id() {
             transaction.id
         }
 
-        void complete() {
+        TransactionBuilder complete() {
             transaction.end()
+            this
         }
 
         private BlockTransaction build() {

dbt-demo/src/ratpack/Ratpack.groovy

@@ -72,5 +72,17 @@ ratpack {
         }
       }
     }
+
+    post('executeQuery') {
+      def transactionManager = get(TransactionManagerService)
+      parse(Form).then { Form form ->
+        def query = form.get('query')
+        transactionManager.execute {
+          it.query(query).complete()
+        } .then {
+          response.send(it.toString())
+        }
+      }
+    }
   }
 }

dbt-demo/src/ratpack/handlebars/index.html.hbs

@@ -19,6 +19,7 @@
                 <input type="hidden" name="transactionId" id="transactionId" />
                 <input name="query" style="width:300px" placeholder="Add query here..." />
                 <button type="submit">Submit Query</button>
+                <button id="submitAndExecute">Submit&Execute Query</button>
             </form>
             <form id="executeTransactionForm" action='/'>
                 <input type="hidden" name="transactionId" id="transactionId" />
@@ -42,7 +43,7 @@
 
             function refreshLedger() {
                 $.get('/ledger', function(data) {
-                   editor.setValue(JSON.stringify(data, null, 2));
+                   editor.setValue(JSON.stringify(data.reverse(), null, 2));
                 });
             }
 
@@ -68,9 +69,20 @@
                    });
             }
 
+            function executeSingleQueryTransaction(event) {
+                event.preventDefault();
+                var queryData = $('form#addQueryForm').serialize();
+                $.post( '/executeQuery', queryData, function(data) {
+                    $('input#transactionId').val(null);
+                    $('button#executeTransactionButton').hide();
+                    refreshLedger();
+                }, 'json');
+            }
+
             $( "#addQueryForm" ).submit(addQueryToTransaction);
             $( "#executeTransactionForm" ).submit(executeTransaction);
             $('button#executeTransactionButton').hide();
+            $('button#submitAndExecute').click(executeSingleQueryTransaction);
             window.onload = refreshLedger();
         </script>
     </body>