fix(core): restore adapter command behavior

harness/tht/adapters/dwh/postgres.py

@@ -1,7 +1,7 @@
 """Direct PostgreSQL implementation of the DWH port."""
 
 from tht.config import DatabaseConfig
-from sqlalchemy.exc import SQLAlchemyError
+from sqlalchemy.exc import OperationalError, SQLAlchemyError
 
 from tht.db import execute, sampling
 from tht.db.connection import can_create_in_schema, make_engine, ping, writable_tables
@@ -22,8 +22,10 @@ class PostgresDwhAdapter:
     def health(self) -> DwhHealth:
         try:
             ping(self._engine)
+        except OperationalError as exc:
+            return DwhHealth(ok=False, detail=str(exc.orig), error_kind="connection")
         except SQLAlchemyError as exc:
-            return DwhHealth(ok=False, detail=str(exc))
+            return DwhHealth(ok=False, detail=str(exc), error_kind="connection")
         writable = tuple(writable_tables(self._engine, self._config.db_schema))
         can_create = can_create_in_schema(self._engine, self._config.db_schema)
         return DwhHealth(ok=True, database=self._config.database, schema=self._config.db_schema,

harness/tht/adapters/dwh/thoth_rest.py

@@ -21,11 +21,12 @@ class ThothRestDwhAdapter:
         try:
             result = self._client.ping()
         except RestError as exc:
-            return DwhHealth(ok=False, detail=str(exc))
+            return DwhHealth(ok=False, detail=str(exc), error_kind="connection")
         ok = bool(result.get("db_connected") and result.get("schema_accessible"))
         return DwhHealth(ok=ok, detail=None if ok else str(result),
                          database=self._database.database, schema=self._database.db_schema,
-                         endpoint=self._client.cfg.base_url, read_only=True)
+                         endpoint=self._client.cfg.base_url, read_only=True,
+                         error_kind=None if ok else "inaccessible")
 
     def introspect(self) -> PhysicalSchema:
         return introspect_rest(

harness/tht/cli/db_cmd.py

@@ -19,7 +19,12 @@ def ping_cmd(config: Path = CONFIG_OPT) -> None:
         raise typer.Exit(code=1)
     health = build_dwh(cfg).health()
     if not health.ok:
-        typer.secho(f"ERRORE di connessione: {health.detail}", fg=typer.colors.RED, err=True)
+        message = (
+            f"ERRORE: DWH non accessibile via REST (risposta: {health.detail})."
+            if health.error_kind == "inaccessible"
+            else f"ERRORE di connessione: {health.detail}"
+        )
+        typer.secho(message, fg=typer.colors.RED, err=True)
         raise typer.Exit(code=1)
     if health.endpoint:
         typer.secho(f"OK: connesso via REST a {health.endpoint} (schema {health.schema})",

harness/tht/cli/lsh_cmd.py

@@ -12,6 +12,30 @@ def _lsh_dir(cfg) -> Path:
     return cfg.paths.indexes / "lsh"
 
 
+def _extract_lsh_values(dwh, physical, annotations, limit):
+    from tht.db.sampling import SkippedColumn, TruncatedColumn, is_text_type
+    from tht.mschema.eligibility import effective_eligibility
+
+    values, skipped, truncated = {}, [], []
+    for table_name, table in physical.tables.items():
+        table_ann = annotations.tables.get(table_name)
+        for column_name, column in table.columns.items():
+            ann_col = table_ann.columns.get(column_name) if table_ann else None
+            if not is_text_type(column.type) or not effective_eligibility(column, ann_col)[0]:
+                continue
+            try:
+                distinct = dwh.distinct_values(table_name, column_name, limit=limit)
+            except Exception as exc:
+                skipped.append(SkippedColumn(table_name, column_name, f"errore: {exc}"))
+                continue
+            vals = [str(value) for value in distinct.values if value not in (None, "")]
+            if vals:
+                values.setdefault(table_name, {})[column_name] = vals
+            if distinct.truncated:
+                truncated.append(TruncatedColumn(table_name, column_name, len(vals)))
+    return values, skipped, truncated
+
+
 @lsh_app.command("build")
 def build_cmd(config: Path = CONFIG_OPT) -> None:
     """Costruisce l'indice LSH dai valori del database e lo salva su pickle."""
@@ -33,31 +57,10 @@ def build_cmd(config: Path = CONFIG_OPT) -> None:
 
     typer.echo("Estrazione valori (i più frequenti) dalle colonne testuali eligible...")
     from tht.adapters.factory import build_dwh
-    from tht.db.sampling import SkippedColumn, TruncatedColumn, is_text_type
-    from tht.mschema.eligibility import effective_eligibility
-
     dwh = build_dwh(cfg)
-    values: dict[str, dict[str, list[str]]] = {}
-    skipped: list[SkippedColumn] = []
-    truncated: list[TruncatedColumn] = []
-    for table_name, table in physical.tables.items():
-        table_ann = annotations.tables.get(table_name)
-        for column_name, column in table.columns.items():
-            ann_col = table_ann.columns.get(column_name) if table_ann else None
-            if not is_text_type(column.type) or not effective_eligibility(column, ann_col)[0]:
-                continue
-            try:
-                distinct = dwh.distinct_values(
-                    table_name, column_name, limit=cfg.lsh.max_values_per_column
-                )
-            except Exception as e:
-                skipped.append(SkippedColumn(table_name, column_name, f"errore: {e}"))
-                continue
-            vals = [str(value) for value in distinct.values if value not in (None, "")]
-            if vals:
-                values.setdefault(table_name, {})[column_name] = vals
-            if distinct.truncated or len(vals) >= cfg.lsh.max_values_per_column:
-                truncated.append(TruncatedColumn(table_name, column_name, len(vals)))
+    values, skipped, truncated = _extract_lsh_values(
+        dwh, physical, annotations, cfg.lsh.max_values_per_column
+    )
     n_values = sum(len(v) for t in values.values() for v in t.values())
     typer.echo(f"  {n_values} valori da {sum(len(t) for t in values.values())} colonne")
     for s in skipped:

harness/tht/ports/dwh.py

@@ -25,6 +25,7 @@ class DwhHealth:
     read_only: bool | None = None
     writable_tables: tuple[str, ...] = ()
     can_create: bool = False
+    error_kind: str | None = None
 
 
 @dataclass(frozen=True)