Add async Python 3.7 reserved keyword

This patch add support for async reserved keyword, which is new in
Python 3.7, so now in Python 3.7 users should use async_ instead.
But we still support to pass async, parameter for old Python
versions.

Change-Id: I847b30c5ce961895edef5725b4cf1ae3421d36c0
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1622043
Signed-off-by: Ondra Machacek <omachace@redhat.com>

generator/src/main/java/org/ovirt/sdk/python/PythonReservedWords.java

@@ -44,6 +44,8 @@ private void init() {
         words.add("and");
         words.add("as");
         words.add("assert");
+        words.add("async");
+        words.add("await");
         words.add("break");
         words.add("class");
         words.add("continue");

generator/src/main/java/org/ovirt/sdk/python/ServicesGenerator.java

@@ -188,6 +188,7 @@ private void generateAddHttpPost(Method method) {
         buffer.addLine("headers=None,");
         buffer.addLine("query=None,");
         buffer.addLine("wait=True,");
+        buffer.addLine("**kwargs");
         buffer.endBlock();
         buffer.addLine("):");
         buffer.startBlock();
@@ -207,6 +208,8 @@ private void generateAddHttpPost(Method method) {
         buffer.addLine("])");
         buffer.addLine();
 
+        proccessKwargs(secondaryParameters);
+
         // Generate the code to build the URL query:
         buffer.addLine("# Build the URL:");
         buffer.addLine("query = query or {}");
@@ -238,6 +241,7 @@ private void generateActionHttpPost(Method method) {
         buffer.addLine("headers=None,");
         buffer.addLine("query=None,");
         buffer.addLine("wait=True,");
+        buffer.addLine("**kwargs");
         buffer.endBlock();
         buffer.addLine("):");
 
@@ -254,6 +258,9 @@ private void generateActionHttpPost(Method method) {
         buffer.addLine("])");
         buffer.addLine();
 
+        // Process kwargs parameters:
+        proccessKwargs(inParameters);
+
         // Generate the code to populate the action:
         buffer.addLine("# Populate the action:");
         buffer.addLine("action = types.Action(");
@@ -306,6 +313,7 @@ private void generateHttpGet(Method method) {
         buffer.addLine("headers=None,");
         buffer.addLine("query=None,");
         buffer.addLine("wait=True,");
+        buffer.addLine("**kwargs");
         buffer.endBlock();
         buffer.addLine("):");
 
@@ -322,6 +330,8 @@ private void generateHttpGet(Method method) {
         buffer.addLine("])");
         buffer.addLine();
 
+        proccessKwargs(inParameters);
+
         // Generate the code to build the URL query:
         buffer.addLine("# Build the URL:");
         buffer.addLine("query = query or {}");
@@ -354,6 +364,7 @@ private void generateHttpPut(Method method) {
         buffer.addLine("headers=None,");
         buffer.addLine("query=None,");
         buffer.addLine("wait=True,");
+        buffer.addLine("**kwargs");
         buffer.endBlock();
         buffer.addLine("):");
 
@@ -371,6 +382,8 @@ private void generateHttpPut(Method method) {
         buffer.addLine("])");
         buffer.addLine();
 
+        proccessKwargs(getSecondaryParameters(method));
+
         // Generate the code to build the URL query:
         buffer.addLine("# Build the URL:");
         buffer.addLine("query = query or {}");
@@ -401,6 +414,7 @@ private void generateHttpDelete(Method method) {
         buffer.addLine("headers=None,");
         buffer.addLine("query=None,");
         buffer.addLine("wait=True,");
+        buffer.addLine("**kwargs");
         buffer.endBlock();
         buffer.addLine("):");
 
@@ -417,6 +431,8 @@ private void generateHttpDelete(Method method) {
         buffer.addLine("])");
         buffer.addLine();
 
+        proccessKwargs(inParameters);
+
         // Generate the code to build the URL query:
         buffer.addLine("# Build the URL:");
         buffer.addLine("query = query or {}");
@@ -432,6 +448,26 @@ private void generateHttpDelete(Method method) {
         buffer.addLine();
     }
 
+
+    /**
+     * This method proccess kwargs parameters, which are used for backward compatibility.
+     */
+    private void proccessKwargs(List<Parameter> inParameters) {
+        boolean asyncPresent = inParameters.stream()
+            .filter(p -> p.getName().equals(NameParser.parseUsingCase("async")))
+            .findAny()
+            .isPresent();
+
+        if (asyncPresent) {
+            buffer.addLine("# Since Python 3.7 async is reserved keyword, support backward compatibility");
+            buffer.addLine("if 'async' in kwargs:");
+            buffer.startBlock();
+            buffer.addLine("async_ = kwargs.get('async')");
+            buffer.endBlock();
+            buffer.addLine();
+        }
+    }
+
     private void generateFormalParameter(Parameter parameter) {
         buffer.addLine("%1$s=None,", pythonNames.getMemberStyleName(parameter.getName()));
     }