Autocreate transaction values if missing from JSON payload

README.md

@@ -29,7 +29,7 @@ bindings {
 The test module contains all the integration tests for the module. 
 
 
-### Docker
+## Docker
 
 There are two projects available for building the executor and the ledger as docker images. 
 
@@ -38,3 +38,29 @@ There are two projects available for building the executor and the ledger as doc
 
 For more information how to run and configure them see their corresponding READMEs.
 
+
+## Docker Compose
+
+The project also comes with a *docker-compose.yml* file for running the docker images. 
+
+To run the images first you need to buid them and publish them to your local docker registry. 
+
+You can do that by running:
+
+1) ``./gradlew dbt-executor:distDocker``
+2) ``./gradlew dbt-ledger:distDocker``
+
+After you have generated the Docker images you can run them both by running ``docker-compose up`` in the root folder. 
+
+The ledger will be available at http://localhost:5050/ledger and the executor 
+will be available at http://localhost:5051/executor
+
+
+## How to make a distributed transaction (in a ratpack application)
+
+Once you have the executor and the ledger configured and running, you can start making transactions to the database 
+the executor is connected to.
+
+By default the executor will set up an in-memory database without any tables, so the first transaction you want to make
+is to create the table you want.
+

dbt-core/src/main/groovy/com/devsoap/dbt/handlers/LedgerUpdateTransactionHandler.groovy

@@ -53,16 +53,24 @@ class LedgerUpdateTransactionHandler implements Handler {
         ctx.request.body.then { body ->
             def mapper = ctx.get(ObjectMapper)
             BlockTransaction transaction = mapper.readValue(body.text, BlockTransaction)
-            log.info("Recieved transaction $transaction.id")
+            if(!transaction.id) {
+                log.info("Recieved null transaction id, creating new transaction")
+                newTransaction(ctx, transaction)
+            } else {
+                log.info("Recieved transaction $transaction.id, updating it")
                 ledgerService.fetchTransaction(transaction.id).then { Optional<BlockTransaction> t ->
-                t.present ? updateTransaction(ctx, transaction) : newTransaction(ctx, transaction)
+                    t.present ? updateTransaction(ctx, t.get(), transaction) : newTransaction(ctx,  transaction)
+                }
             }
         }
     }
 
-    private void updateTransaction(Context ctx, BlockTransaction transaction) {
+    private void updateTransaction(Context ctx, BlockTransaction oldTransaction, BlockTransaction newTransaction) {
+
+        log.info "Transaction $newTransaction.id exists, updating transaction"
+        def transaction = cloneTransaction(oldTransaction, newTransaction)
+
         def ledgerService = ctx.get(LedgerService)
-        log.info "Transaction $transaction.id exists, updating transaction"
         ledgerService.updateTransaction(transaction).then {
             log.info("Transaction $it updated in ledger")
             if (transaction.completed & !(transaction.executed || transaction.rolledback)) {
@@ -74,14 +82,12 @@ class LedgerUpdateTransactionHandler implements Handler {
         }
     }
 
-    private void newTransaction(Context ctx, BlockTransaction transaction) {
+    private void newTransaction(Context ctx, BlockTransaction newTransaction) {
-        if(transaction.executed || transaction.rolledback) {
+
-            log.error("Tried to create a already executed transaction $transaction.id")
+        log.info("Creating new transaction")
-            throw new IllegalArgumentException("Cannot create a transaction with executed or rolledback status")
+        def transaction = cloneTransaction(new BlockTransaction(), newTransaction)
-        }
 
         def ledgerService = ctx.get(LedgerService)
-        log.info("Creating new transaction")
         ledgerService.newTransaction(transaction).then {
             log.info("Transaction $it added to ledger")
             if(transaction.completed){
@@ -92,4 +98,23 @@ class LedgerUpdateTransactionHandler implements Handler {
             }
         }
     }
+
+    private static BlockTransaction cloneTransaction(BlockTransaction oldTransaction, BlockTransaction newTransaction) {
+        def transaction = new BlockTransaction()
+        transaction.id = oldTransaction.id
+        transaction.executed = oldTransaction.executed
+        transaction.completed = oldTransaction.completed
+        transaction.rolledback = oldTransaction.rolledback
+
+        newTransaction.queries.each { q ->
+            def query = transaction.queries.isEmpty() ?
+                    new BlockTransaction.Query(oldTransaction, q.query) :
+                    new BlockTransaction.Query(transaction.queries.last(), q.query)
+            query.resultError = q.resultError
+            query.result = q.result
+            transaction.queries << query
+        }
+
+        transaction
+    }
 }

docker-compose.yml

@@ -16,4 +16,4 @@ services:
     environment:
       - RATPACK_DBT__EXECUTOR__REMOTE_URL=http://executor:5051/executor
     ports:
-      - "5050"
+      - "5050:5050"