Prevent logging of result of resources.string() method call

The result of resources.string() method is the content of the file
saved to string. Logging of binary file content causes
UnicodeDecode error. Moreover, logging of any file content can be
security issue. Finally, it is just not practical to fill the logs
with tons of text from the big files.

Change-Id: I87077b002f2a8888c22b4dfba1f7b9f0508fec69
Closes-bug: #1561522

murano/engine/system/resource_manager.py

@@ -19,6 +19,7 @@ import yaml as yamllib
 from yaql.language import specs
 from yaql.language import yaqltypes
 
+from murano.dsl import constants
 from murano.dsl import dsl
 from murano.dsl import dsl_types
 from murano.dsl import helpers
@@ -52,6 +53,7 @@ class ResourceManager(object):
     @staticmethod
     @specs.parameter('owner', dsl.MuranoTypeParameter(nullable=True))
     @specs.inject('receiver', yaqltypes.Receiver())
+    @specs.meta(constants.META_NO_TRACE, True)
     def string(receiver, name, owner=None, binary=False):
         path = ResourceManager._get_package(owner, receiver).get_resource(name)
         mode = 'rb' if binary else 'rU'
@@ -61,12 +63,14 @@ class ResourceManager(object):
     @classmethod
     @specs.parameter('owner', dsl.MuranoTypeParameter(nullable=True))
     @specs.inject('receiver', yaqltypes.Receiver())
+    @specs.meta(constants.META_NO_TRACE, True)
     def json(cls, receiver, name, owner=None):
         return jsonlib.loads(cls.string(receiver, name, owner))
 
     @classmethod
     @specs.parameter('owner', dsl.MuranoTypeParameter(nullable=True))
     @specs.inject('receiver', yaqltypes.Receiver())
+    @specs.meta(constants.META_NO_TRACE, True)
     def yaml(cls, receiver, name, owner=None):
         return yamllib.load(
             cls.string(receiver, name, owner), Loader=yaml_loader)

releasenotes/notes/string-logging-20b8e60a957ba6b7.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - Murano engine no longer logs methods ``string()``, ``json()``, and ``yaml()``
+    of the 'io.murano.system.Resources' class. This is done to prevent UnicodeDecodeError's
+    when transferring binary files to murano agent.