1 files changed, 61 insertions, 0 deletions
diff --git a/python/knot_resolver/datamodel/globals.py b/python/knot_resolver/datamodel/globals.py
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+++ b/python/knot_resolver/datamodel/globals.py
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+"""
+The parsing and validation of the datamodel is dependent on a global state:
+- a file system path used for resolving relative paths
+
+
+Commentary from @vsraier:
+=========================
+
+While this is not ideal, it is the best we can do at the moment. When I created this module,
+the datamodel was dependent on the global state implicitely. The validation procedures just read
+the current working directory. This module is the first step in removing the global dependency.
+
+At some point in the future, it might be interesting to add something like a "validation context"
+to the modelling tools. It is not technically complicated, but it requires
+massive model changes I am not willing to make at the moment. Ideally, when implementing this,
+the BaseSchema would turn into an empty class without any logic. Not even a constructor. All logic
+would be in the ObjectMapper class. Similar to how Gson works in Java or AutoMapper in C#.
+"""
+
+from pathlib import Path
+from typing import Optional
+
+
+class Context:
+    resolve_root: Optional[Path]
+    strict_validation: bool
+
+    def __init__(self, resolve_root: Optional[Path], strict_validation: bool = True) -> None:
+        self.resolve_root = resolve_root
+        self.strict_validation = strict_validation
+
+
+_global_context: Context = Context(None)
+
+
+def set_global_validation_context(context: Context) -> None:
+    global _global_context
+    _global_context = context
+
+
+def get_global_validation_context() -> Context:
+    return _global_context
+
+
+def reset_global_validation_context() -> None:
+    global _global_context
+    _global_context = Context(None)
+
+
+def get_resolve_root() -> Path:
+    if _global_context.resolve_root is None:
+        raise RuntimeError(
+            "Global validation context 'resolve_root' is not set!"
+            " Before validation, you have to set it using `set_global_validation_context()` function!"
+        )
+
+    return _global_context.resolve_root
+
+
+def get_strict_validation() -> bool:
+    return _global_context.strict_validation