refactor(core): route integrations through adapter factory

harness/tht/cli/schema_cmd.py

@@ -1,13 +1,10 @@
 from pathlib import Path
 
 import typer
-from sqlalchemy.exc import OperationalError
-
+from tht.adapters.factory import build_dwh
 from tht.cli.config_cmd import CONFIG_OPT
 from tht.config import ConfigError, load_config
-from tht.db.connection import make_engine
-from tht.db.introspect import IntrospectionError, introspect
-from tht.db.sampling import add_examples
+from tht.db.sampling import is_text_type
 from tht.mschema.eligibility import classify_all
 
 schema_app = typer.Typer(help="Gestione mschema (rappresentazione canonica dello schema)")
@@ -64,32 +61,25 @@ def introspect_cmd(
                 fg=typer.colors.GREEN,
             )
             return
-    if cfg.database.transport == "rest":
-        from tht.db.introspect import introspect_rest
-        from tht.db.sampling import add_examples_rest
-        from tht.rest.client import RestClient, RestError
-
-        client = RestClient(cfg.rest)
-        try:
-            phys = introspect_rest(
-                client, database=cfg.database.database, schema=cfg.database.db_schema
-            )
-            add_examples_rest(client, phys, cfg.examples)
-            classify_all(phys, cfg.eligibility)
-        except RestError as e:
-            typer.secho(f"ERRORE: {e}", fg=typer.colors.RED, err=True)
-            raise typer.Exit(code=1)
-    else:
-        engine = make_engine(cfg.database)
-        try:
-            phys = introspect(
-                engine, database=cfg.database.database, schema=cfg.database.db_schema
-            )
-            add_examples(engine, phys, cfg.examples)
-            classify_all(phys, cfg.eligibility)
-        except (OperationalError, IntrospectionError) as e:
-            typer.secho(f"ERRORE: {e}", fg=typer.colors.RED, err=True)
-            raise typer.Exit(code=1)
+    try:
+        dwh = build_dwh(cfg)
+        phys = dwh.introspect()
+        for table_name, table in phys.tables.items():
+            for column_name, column in table.columns.items():
+                if is_text_type(column.type):
+                    column.examples = [
+                        str(value)
+                        for value in dwh.sample_column(
+                            table_name,
+                            column_name,
+                            limit=cfg.examples.max_per_column,
+                        )
+                        if value not in (None, "")
+                    ]
+        classify_all(phys, cfg.eligibility)
+    except Exception as e:
+        typer.secho(f"ERRORE: {e}", fg=typer.colors.RED, err=True)
+        raise typer.Exit(code=1)
     phys.to_yaml(out)
     n_cols = sum(len(t.columns) for t in phys.tables.values())
     n_ignored = sum(