Hermes-agent

hermes_cli/fallback_config.py

@@ -0,0 +1,72 @@
+"""Helpers for reading the effective fallback provider chain from config."""
+
+from __future__ import annotations
+
+from typing import Any
+
+
+def _normalized_base_url(value: Any) -> str:
+    if not isinstance(value, str):
+        return ""
+    return value.strip().rstrip("/")
+
+
+def _iter_fallback_entries(raw: Any) -> list[dict[str, Any]]:
+    if isinstance(raw, dict):
+        candidates = [raw]
+    elif isinstance(raw, list):
+        candidates = raw
+    else:
+        return []
+
+    entries: list[dict[str, Any]] = []
+    for entry in candidates:
+        if not isinstance(entry, dict):
+            continue
+        provider = str(entry.get("provider") or "").strip()
+        model = str(entry.get("model") or "").strip()
+        if not provider or not model:
+            continue
+
+        normalized = dict(entry)
+        normalized["provider"] = provider
+        normalized["model"] = model
+
+        base_url = _normalized_base_url(entry.get("base_url"))
+        if base_url:
+            normalized["base_url"] = base_url
+
+        entries.append(normalized)
+    return entries
+
+
+def _entry_identity(entry: dict[str, Any]) -> tuple[str, str, str]:
+    return (
+        str(entry.get("provider") or "").strip().lower(),
+        str(entry.get("model") or "").strip().lower(),
+        _normalized_base_url(entry.get("base_url")).lower(),
+    )
+
+
+def get_fallback_chain(config: dict[str, Any] | None) -> list[dict[str, Any]]:
+    """Return the effective fallback chain merged across old and new config keys.
+
+    ``fallback_providers`` remains the primary source of truth and keeps its
+    order. Legacy ``fallback_model`` entries are appended afterwards unless
+    they target the same provider/model/base_url route as an earlier entry.
+    The returned list always contains fresh dict copies.
+    """
+
+    config = config or {}
+    chain: list[dict[str, Any]] = []
+    seen: set[tuple[str, str, str]] = set()
+
+    for key in ("fallback_providers", "fallback_model"):
+        for entry in _iter_fallback_entries(config.get(key)):
+            identity = _entry_identity(entry)
+            if identity in seen:
+                continue
+            seen.add(identity)
+            chain.append(entry)
+
+    return chain