Partial updates (#63)

plugins/modules/gcp_compute_target_tcp_proxy.py

@@ -214,7 +214,7 @@ def main():
     if fetch:
         if state == 'present':
             if is_different(module, fetch):
-                fetch = update(module, self_link(module), kind)
+                fetch = update(module, self_link(module), kind, fetch)
                 changed = True
         else:
             delete(module, self_link(module), kind)
@@ -237,8 +237,43 @@ def create(module, link, kind):
     return wait_for_operation(module, auth.post(link, resource_to_request(module)))
 
 
-def update(module, link, kind):
-    module.fail_json(msg="TargetTcpProxy cannot be edited")
+def update(module, link, kind, fetch):
+    update_fields(module, resource_to_request(module),
+                  response_to_hash(module, fetch))
+    return fetch_resource(module, self_link(module), kind)
+
+
+def update_fields(module, request, response):
+    if response.get('proxyHeader') != request.get('proxyHeader'):
+        proxy_header_update(module, request, response)
+    if response.get('service') != request.get('service'):
+        service_update(module, request, response)
+
+
+def proxy_header_update(module, request, response):
+    auth = GcpSession(module, 'compute')
+    auth.post(
+        ''.join([
+            "https://www.googleapis.com/compute/v1/",
+            "projects/{project}/global/targetTcpProxies/{name}/setProxyHeader"
+        ]).format(**module.params),
+        {
+            u'proxyHeader': module.params.get('proxy_header')
+        }
+    )
+
+
+def service_update(module, request, response):
+    auth = GcpSession(module, 'compute')
+    auth.post(
+        ''.join([
+            "https://www.googleapis.com/compute/v1/",
+            "projects/{project}/global/targetTcpProxies/{name}/setBackendService"
+        ]).format(**module.params),
+        {
+            u'service': replace_resource_dict(module.params.get(u'service', {}), 'selfLink')
+        }
+    )
 
 
 def delete(module, link, kind):