feat(V2): Deribit credenziali per env (CLIENT_ID/SECRET _TESTNET / _LIVE)

DeribitSettings ora supporta coppie credenziali distinte per testnet e
mainnet via DERIBIT_CLIENT_ID_TESTNET/_LIVE e DERIBIT_CLIENT_SECRET_TESTNET/_LIVE.
Le coppie env-specifiche prevalgono sulla coppia base
DERIBIT_CLIENT_ID/DERIBIT_CLIENT_SECRET (mantenuta per backward compat).

build_client risolve la coppia giusta tramite settings.deribit.credentials(env);
ValueError esplicito se nessuna coppia configurata per l'env richiesto.

+4 test (legacy single, per-env, override, missing). Fix anche isolation
da .env reale via monkeypatch.chdir(tmp_path).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.env.example

@@ -17,8 +17,14 @@ TESTNET_TOKEN=
 MAINNET_TOKEN=
 
 # ─── EXCHANGE — DERIBIT ───────────────────────────────────
+# Coppia singola (usata sia per testnet sia per mainnet):
 DERIBIT_CLIENT_ID=
 DERIBIT_CLIENT_SECRET=
+# Oppure coppie distinte per env (prevalgono se valorizzate):
+# DERIBIT_CLIENT_ID_TESTNET=
+# DERIBIT_CLIENT_SECRET_TESTNET=
+# DERIBIT_CLIENT_ID_LIVE=
+# DERIBIT_CLIENT_SECRET_LIVE=
 DERIBIT_URL_LIVE=https://www.deribit.com/api/v2
 DERIBIT_URL_TESTNET=https://test.deribit.com/api/v2
 DERIBIT_MAX_LEVERAGE=3

src/cerbero_mcp/exchanges/__init__.py

@@ -15,9 +15,10 @@ async def build_client(
         from cerbero_mcp.exchanges.deribit.client import DeribitClient
 
         url = settings.deribit.url_testnet if env == "testnet" else settings.deribit.url_live
+        cid, csec = settings.deribit.credentials(env)
         return DeribitClient(
-            client_id=settings.deribit.client_id,
-            client_secret=settings.deribit.client_secret.get_secret_value(),
+            client_id=cid,
+            client_secret=csec,
             testnet=(env == "testnet"),
             base_url_override=url,
         )

src/cerbero_mcp/settings.py

@@ -21,12 +21,33 @@ class DeribitSettings(_Sub):
         env_prefix="DERIBIT_",
         extra="ignore",
     )
-    client_id: str
-    client_secret: SecretStr
+    client_id: str | None = None
+    client_secret: SecretStr | None = None
+    client_id_testnet: str | None = None
+    client_secret_testnet: SecretStr | None = None
+    client_id_live: str | None = None
+    client_secret_live: SecretStr | None = None
     url_live: str
     url_testnet: str
     max_leverage: int = 3
 
+    def credentials(self, env: str) -> tuple[str, str]:
+        """Return (client_id, client_secret) for the given env.
+        Prefers env-specific (_TESTNET / _LIVE) pair; falls back to base
+        (DERIBIT_CLIENT_ID / DERIBIT_CLIENT_SECRET) for legacy single-pair setups.
+        """
+        if env == "testnet":
+            cid = self.client_id_testnet or self.client_id
+            csec = self.client_secret_testnet or self.client_secret
+        elif env == "mainnet":
+            cid = self.client_id_live or self.client_id
+            csec = self.client_secret_live or self.client_secret
+        else:
+            raise ValueError(f"unknown deribit env: {env}")
+        if not cid or csec is None:
+            raise ValueError(f"Deribit credentials not configured for env={env}")
+        return cid, csec.get_secret_value()
+
 
 class BybitSettings(_Sub):
     model_config = SettingsConfigDict(

tests/unit/test_settings.py

@@ -51,7 +51,8 @@ def test_settings_load_minimal(monkeypatch):
     assert s.alpaca.max_leverage == 1
 
 
-def test_settings_missing_token_fails(monkeypatch):
+def test_settings_missing_token_fails(monkeypatch, tmp_path):
+    monkeypatch.chdir(tmp_path)  # isola dal .env reale del working dir
     env = _minimal_env()
     env.pop("TESTNET_TOKEN")
     for k, v in env.items():
@@ -84,3 +85,73 @@ def test_settings_secret_str_no_leak(monkeypatch):
     s = Settings()
     assert "t_test_123" not in repr(s)
     assert "t_live_456" not in repr(s)
+
+
+def _isolated(monkeypatch, tmp_path, env: dict) -> None:
+    """Isola Settings dal .env reale in working dir e setta solo env passato."""
+    monkeypatch.chdir(tmp_path)
+    for k in (
+        "DERIBIT_CLIENT_ID", "DERIBIT_CLIENT_SECRET",
+        "DERIBIT_CLIENT_ID_TESTNET", "DERIBIT_CLIENT_SECRET_TESTNET",
+        "DERIBIT_CLIENT_ID_LIVE", "DERIBIT_CLIENT_SECRET_LIVE",
+    ):
+        monkeypatch.delenv(k, raising=False)
+    for k, v in env.items():
+        monkeypatch.setenv(k, v)
+
+
+def test_deribit_credentials_legacy_single_pair(monkeypatch, tmp_path):
+    """Solo DERIBIT_CLIENT_ID/SECRET → entrambi gli env usano la stessa coppia."""
+    _isolated(monkeypatch, tmp_path, _minimal_env())
+
+    from cerbero_mcp.settings import Settings
+
+    s = Settings()
+    assert s.deribit.credentials("testnet") == ("id", "secret")
+    assert s.deribit.credentials("mainnet") == ("id", "secret")
+
+
+def test_deribit_credentials_per_env_pairs(monkeypatch, tmp_path):
+    """Coppie _TESTNET e _LIVE → ognuna serve l'env corrispondente."""
+    env = _minimal_env()
+    env.pop("DERIBIT_CLIENT_ID")
+    env.pop("DERIBIT_CLIENT_SECRET")
+    env["DERIBIT_CLIENT_ID_TESTNET"] = "tid"
+    env["DERIBIT_CLIENT_SECRET_TESTNET"] = "tsec"
+    env["DERIBIT_CLIENT_ID_LIVE"] = "lid"
+    env["DERIBIT_CLIENT_SECRET_LIVE"] = "lsec"
+    _isolated(monkeypatch, tmp_path, env)
+
+    from cerbero_mcp.settings import Settings
+
+    s = Settings()
+    assert s.deribit.credentials("testnet") == ("tid", "tsec")
+    assert s.deribit.credentials("mainnet") == ("lid", "lsec")
+
+
+def test_deribit_credentials_env_specific_overrides_fallback(monkeypatch, tmp_path):
+    """_LIVE presente prevale sulla coppia base anche se entrambe configurate."""
+    env = _minimal_env()
+    env["DERIBIT_CLIENT_ID_LIVE"] = "lid"
+    env["DERIBIT_CLIENT_SECRET_LIVE"] = "lsec"
+    _isolated(monkeypatch, tmp_path, env)
+
+    from cerbero_mcp.settings import Settings
+
+    s = Settings()
+    assert s.deribit.credentials("mainnet") == ("lid", "lsec")
+    assert s.deribit.credentials("testnet") == ("id", "secret")  # fallback
+
+
+def test_deribit_credentials_missing_raises(monkeypatch, tmp_path):
+    """Nessuna coppia configurata → ValueError esplicito."""
+    env = _minimal_env()
+    env.pop("DERIBIT_CLIENT_ID")
+    env.pop("DERIBIT_CLIENT_SECRET")
+    _isolated(monkeypatch, tmp_path, env)
+
+    from cerbero_mcp.settings import Settings
+
+    s = Settings()
+    with pytest.raises(ValueError, match="not configured for env=mainnet"):
+        s.deribit.credentials("mainnet")