feat: add database dropdown to dashboard import (#10118)

* feat: add database dropdown to dashboard import

Currently, when importing a database from a JSON file, the process
looks at the database name from the source (the info is in the file)
and matches the datasources to that name. If no database by that name
exists, it simply fails.

With this PR, we add a database dropdown that allows the user to specify
which databases the datasources should target as the get upserted.

I want to stress that the code in this area is not in a great shape,
and that the challenge of serializing/deser the nested objects is
challenging, but that there should be a much better way to do this.
One of the improvement (out of scope for this PR) that would allow to
simplify those import/export would be to use UUIDs for
importable/exportable objects.

Another identified issue is the indirections between
`utils/import_expor_{model}.py` on top of `{Model}.import_object`. Not
addressing that here.

Next topic is the MVC stuff. Decided to stick with it for now as this is
more of a [obious missing feat:] than a rewrite.

* isort \!? 0%^$%Y$&?%$^?%0^?

* fix tests

* pre-committing to py3.6

* address dpgaspar's comments

* revert isort

superset-frontend/src/components/FlashProvider.tsx

@@ -31,6 +31,7 @@ interface Props {
 
 const flashObj = {
   info: 'addInfoToast',
+  alert: 'addDangerToast',
   danger: 'addDangerToast',
   warning: 'addWarningToast',
   success: 'addSuccessToast',
@@ -42,7 +43,9 @@ class FlashProvider extends React.PureComponent<Props> {
     flashMessages.forEach(message => {
       const [type, text] = message;
       const flash = flashObj[type];
-      this.props[flash](text);
+      if (this.props[flash]) {
+        this.props[flash](text);
+      }
     });
   }
   render() {

superset/connectors/sqla/models.py

@@ -1238,7 +1238,10 @@ def fetch_metadata(self, commit: bool = True) -> None:
 
     @classmethod
     def import_obj(
-        cls, i_datasource: "SqlaTable", import_time: Optional[int] = None
+        cls,
+        i_datasource: "SqlaTable",
+        database_id: Optional[int] = None,
+        import_time: Optional[int] = None,
     ) -> int:
         """Imports the datasource from the object to the database.
 
@@ -1275,7 +1278,12 @@ def lookup_database(table_: SqlaTable) -> Database:
                 )
 
         return import_datasource.import_datasource(
-            db.session, i_datasource, lookup_database, lookup_sqlatable, import_time
+            db.session,
+            i_datasource,
+            lookup_database,
+            lookup_sqlatable,
+            import_time,
+            database_id,
         )
 
     @classmethod

superset/exceptions.py

@@ -77,3 +77,7 @@ class DatabaseNotFound(SupersetException):
 
 class QueryObjectValidationError(SupersetException):
     status = 400
+
+
+class DashboardImportException(SupersetException):
+    pass

superset/models/dashboard.py

@@ -247,7 +247,7 @@ def position(self) -> Dict[str, Any]:
 
     @classmethod
     def import_obj(  # pylint: disable=too-many-locals,too-many-branches,too-many-statements
-        cls, dashboard_to_import: "Dashboard", import_time: Optional[int] = None
+        cls, dashboard_to_import: "Dashboard", import_time: Optional[int] = None,
     ) -> int:
         """Imports the dashboard from the object to the database.
 
@@ -311,6 +311,10 @@ def alter_positions(
         # copy slices object as Slice.import_slice will mutate the slice
         # and will remove the existing dashboard - slice association
         slices = copy(dashboard_to_import.slices)
+
+        # Clearing the slug to avoid conflicts
+        dashboard_to_import.slug = None
+
         old_json_metadata = json.loads(dashboard_to_import.json_metadata or "{}")
         old_to_new_slc_id_dict: Dict[int, int] = {}
         new_timed_refresh_immune_slices = []
@@ -332,8 +336,8 @@ def alter_positions(
             new_slc_id = Slice.import_obj(slc, remote_slc, import_time=import_time)
             old_to_new_slc_id_dict[slc.id] = new_slc_id
             # update json metadata that deals with slice ids
-            new_slc_id_str = "{}".format(new_slc_id)
-            old_slc_id_str = "{}".format(slc.id)
+            new_slc_id_str = str(new_slc_id)
+            old_slc_id_str = str(slc.id)
             if (
                 "timed_refresh_immune_slices" in i_params_dict
                 and old_slc_id_str in i_params_dict["timed_refresh_immune_slices"]

superset/templates/superset/import_dashboards.html

@@ -24,29 +24,46 @@
   {% include "superset/flash_wrapper.html" %}
 
   <div class="container">
-    <h1>Import dashboards</h1>
+    <div class="panel">
+      <div class="panel-heading"><h3>{{ _("Import Dashboard(s)") }}</h3></div>
+      <div class="panel-body">
 
-    <form method="post" enctype="multipart/form-data">
-      <input
-      type="hidden"
-      name="csrf_token"
-      id="csrf_token"
-      value="{{ csrf_token() if csrf_token else '' }}" />
-      <p>
-        <label class="btn btn-default btn-sm" for="my-file-selector">
+        <form method="post" enctype="multipart/form-data">
           <input
-            id="my-file-selector"
-            type="file"
-            name="file"
-            style="display:none;"
-            onchange="$('#upload-file-info').html(this.files[0].name)"/>
-          Choose File
-        </label>
-        <span class='label label-info' id="upload-file-info"></span>
-        <br/>
-        <br/>
-        <input type="submit" value="Upload" class="btn btn-primary btn-sm" />
-      </p>
-    </form>
+          type="hidden"
+          name="csrf_token"
+          id="csrf_token"
+          value="{{ csrf_token() if csrf_token else '' }}" />
+          <table class="table table-bordered">
+            <tr>
+              <td>{{ _("File") }}</td>
+              <td>
+                <label class="btn btn-default btn-sm" for="my-file-selector">
+                  <input
+                    id="my-file-selector"
+                    type="file"
+                    name="file"
+                    style="display:none;"
+                    onchange="$('#upload-file-info').html(this.files[0].name)"/>
+                  {{ _("Choose File") }}
+                </label>
+                <span class='label label-info' id="upload-file-info"></span>
+              </td>
+            </tr>
+            <tr>
+              <td>{{ _("Database") }}</td>
+              <td>
+                <select id="db_id" name="db_id" class="form-control input-sm" style="width: 300px">
+                  {% for db in databases %}
+                    <option value="{{ db.id }}">{{ db.name }}</option>
+                  {% endfor %}
+                </select>
+              </td>
+            </tr>
+          </table>
+          <input type="submit" value="{{ _("Upload") }}" class="btn btn-primary btn-sm" />
+        </form>
+      </div>
+    </div>
   </div>
 {% endblock %}

superset/utils/dashboard_import_export.py

@@ -21,9 +21,11 @@
 from io import BytesIO
 from typing import Any, Dict, Optional
 
+from flask_babel import lazy_gettext as _
 from sqlalchemy.orm import Session
 
 from superset.connectors.sqla.models import SqlaTable, SqlMetric, TableColumn
+from superset.exceptions import DashboardImportException
 from superset.models.dashboard import Dashboard
 from superset.models.slice import Slice
 
@@ -69,14 +71,19 @@ def decode_dashboards(  # pylint: disable=too-many-return-statements
 
 
 def import_dashboards(
-    session: Session, data_stream: BytesIO, import_time: Optional[int] = None
+    session: Session,
+    data_stream: BytesIO,
+    database_id: Optional[int] = None,
+    import_time: Optional[int] = None,
 ) -> None:
     """Imports dashboards from a stream to databases"""
     current_tt = int(time.time())
     import_time = current_tt if import_time is None else import_time
     data = json.loads(data_stream.read(), object_hook=decode_dashboards)
+    if not data:
+        raise DashboardImportException(_("No data in file"))
     for table in data["datasources"]:
-        type(table).import_obj(table, import_time=import_time)
+        type(table).import_obj(table, database_id, import_time=import_time)
     session.commit()
     for dashboard in data["dashboards"]:
         Dashboard.import_obj(dashboard, import_time=import_time)

superset/utils/import_datasource.py

@@ -24,12 +24,13 @@
 logger = logging.getLogger(__name__)
 
 
-def import_datasource(
+def import_datasource(  # pylint: disable=too-many-arguments
     session: Session,
     i_datasource: Model,
     lookup_database: Callable[[Model], Model],
     lookup_datasource: Callable[[Model], Model],
     import_time: Optional[int] = None,
+    database_id: Optional[int] = None,
 ) -> int:
     """Imports the datasource from the object to the database.
 
@@ -41,7 +42,9 @@ def import_datasource(
     logger.info("Started import of the datasource: %s", i_datasource.to_json())
 
     i_datasource.id = None
-    i_datasource.database_id = lookup_database(i_datasource).id
+    i_datasource.database_id = (
+        database_id if database_id else lookup_database(i_datasource).id
+    )
     i_datasource.alter_params(import_time=import_time)
 
     # override the datasource

superset/utils/log.py

@@ -24,6 +24,7 @@
 from typing import Any, Callable, cast, Optional, Type
 
 from flask import current_app, g, request
+from sqlalchemy.exc import SQLAlchemyError
 
 from superset.stats_logger import BaseStatsLogger
 
@@ -169,6 +170,10 @@ def log(  # pylint: disable=too-many-locals
             )
             logs.append(log)
 
-        sesh = current_app.appbuilder.get_session
-        sesh.bulk_save_objects(logs)
-        sesh.commit()
+        try:
+            sesh = current_app.appbuilder.get_session
+            sesh.bulk_save_objects(logs)
+            sesh.commit()
+        except SQLAlchemyError as ex:
+            logging.error("DBEventLogger failed to log event(s)")
+            logging.exception(ex)

superset/views/core.py

@@ -75,6 +75,7 @@
     SupersetTimeoutException,
 )
 from superset.jinja_context import get_template_processor
+from superset.models.core import Database
 from superset.models.dashboard import Dashboard
 from superset.models.datasource_access_request import DatasourceAccessRequest
 from superset.models.slice import Slice
@@ -541,10 +542,15 @@ def explore_json(
     @expose("/import_dashboards", methods=["GET", "POST"])
     def import_dashboards(self) -> FlaskResponse:
         """Overrides the dashboards using json instances from the file."""
-        f = request.files.get("file")
-        if request.method == "POST" and f:
+        import_file = request.files.get("file")
+        if request.method == "POST" and import_file:
+            success = False
+            database_id = request.form.get("db_id")
             try:
-                dashboard_import_export.import_dashboards(db.session, f.stream)
+                dashboard_import_export.import_dashboards(
+                    db.session, import_file.stream, database_id
+                )
+                success = True
             except DatabaseNotFound as ex:
                 logger.exception(ex)
                 flash(
@@ -565,8 +571,14 @@ def import_dashboards(self) -> FlaskResponse:
                     ),
                     "danger",
                 )
-            return redirect("/dashboard/list/")
-        return self.render_template("superset/import_dashboards.html")
+            if success:
+                flash("Dashboard(s) have been imported", "success")
+                return redirect("/dashboard/list/")
+
+        databases = db.session.query(Database).all()
+        return self.render_template(
+            "superset/import_dashboards.html", databases=databases
+        )
 
     @event_logger.log_this
     @has_access