Initial commit

This is a FastAPI backend microservice template used with `copier` utility.

Features of applied template are:
- Configuration file processing logic
- Metrics and tracing (both optional) configuration available
- Debug endpoints
- Database migration commands, prepared Alembic environment
- Database usage example in ping_db endpoint
- gitea sanity check pipeline

{{project_slug}}/utils/secrets.py

@@ -0,0 +1,49 @@
+"""Basic functionality to work with sensitive data in configs is defined here."""
+
+import os
+import re
+from typing import Any
+
+import yaml
+
+_env_re = re.compile(r"^!env\((?P<env_var>.+)\)$")
+
+
+class SecretStr(str):
+    """String value which returns "<REDACTED>" on str() and repr() calls.
+
+    If given value matches pattern `^!env\\(.+\\)$` then try to get value from environment variables by the given name.
+
+    To get a value inside one should use `get_secret_value` method.
+    """
+
+    def __new__(cls, other: Any):
+        if isinstance(other, SecretStr):
+            return super().__new__(cls, other.get_secret_value())
+        if isinstance(other, str):
+            if (m := _env_re.match(other)) is not None:
+                env_var = m.group("env_var")
+                if env_var in os.environ:
+                    other = os.environ[env_var]
+                else:
+                    print(
+                        f"CAUTION: secret variable '{other}' looks like a mapping from env,"
+                        f" but no '{env_var} value is found'"
+                    )
+            return super().__new__(cls, other)
+
+    def __str__(self) -> str:
+        return "<REDACTED>"
+
+    def __repr__(self) -> str:
+        return "'<REDACTED!r>'"
+
+    def get_secret_value(self) -> str:
+        return super().__str__()
+
+
+def representSecretStrYAML(dumper: yaml.Dumper, s: SecretStr):
+    return dumper.represent_str(s.get_secret_value())
+
+
+yaml.add_representer(SecretStr, representSecretStrYAML)