Improve query preflight

Now even a (configurable) timeout in the preflight results in warning
popup. This should catch queries producing small concordances but
with costly search (e.g. position ranges, negations, global conditions).

The configuration key is: global/preflight_query_timeout_ms

conf/config.default.xml

@@ -40,6 +40,7 @@
         <no_anonymous_access>0</no_anonymous_access>
         <jwt_secret>my_secret</jwt_secret>
         <enabled_websockets>0</enabled_websockets>
+        <preflight_query_timeout_ms>3000</preflight_query_timeout_ms>
     </global>
     <calc_backend>
         <type>rq</type>

conf/config.rng

@@ -415,6 +415,16 @@
                             </oneOrMore>
                         </element>
                     </optional>
+                    <optional>
+                        <element name="preflight_query_timeout_ms">
+                            <a:documentation>
+                                For preflight queries, this speicifies how long KonText client-side waits
+                                for the query. In case it is not finished in the limit, the client will
+                                consider the query a &quot;long one&quot; and warn user accordingly.
+                            </a:documentation>
+                            <data type="nonNegativeInteger" />
+                        </element>
+                    </optional>
                 </interleave>
             </element>
             <element name="calc_backend">

lib/action/model/base.py

@@ -126,6 +126,7 @@ async def add_globals(self, app: Sanic, action_props: ActionProps, result: Dict[
         result['issue_reporting_action'] = None
         result['help_links'] = {}
         result['_version'] = None
+        result['preflight_query_timeout_ms'] = settings.get_int('global', 'preflight_query_timeout_ms', 0)
         return result
 
     def init_menu(self, result):

lib/action/model/corpus.py

@@ -19,7 +19,6 @@
 
 
 import logging
-import urllib.parse
 from dataclasses import asdict
 from functools import partial
 from typing import (

public/files/js/models/query/first.ts

@@ -22,7 +22,8 @@
 
 import { IFullActionControl } from 'kombo';
 import { Observable, of as rxOf } from 'rxjs';
-import { tap, map, concatMap, reduce } from 'rxjs/operators';
+import { AjaxTimeoutError } from 'rxjs/ajax';
+import { tap, map, concatMap, reduce, catchError } from 'rxjs/operators';
 import { Dict, tuple, List, pipe, HTTP, Rx } from 'cnc-tskit';
 
 import * as Kontext from '../../types/kontext';
@@ -1119,9 +1120,20 @@ export class FirstQueryFormModel extends QueryFormModel<FirstQueryFormModelState
             ),
             this.createPreflightArgs(contextData, ttSelections, preflightSubc),
             {
-                contentType: 'application/json'
+                contentType: 'application/json',
+                timeout: this.pageModel.getConf('PreflightTimeoutMs') || 0
             }
         ).pipe(
+            catchError(
+                err => {
+                    if (err instanceof AjaxTimeoutError) {
+                        return rxOf({
+                            sizeIpm: preflightSubc.threshold_ipm + 1
+                        });
+                    }
+                    throw err;
+                }
+            ),
             map(
                 ans => ({
                     contextData,

templates/document.html

@@ -49,5 +49,6 @@
 __conf.TextDirectionRTL = {{ righttoleft|default(false, true)|to_json }};
 __conf.InitialFreqLevel = {{ last_freq_level|default(1, true)|to_json }};
 __conf.maxDispersionResolution = {{ max_dispersion_resulution|default(0, true)|to_json }};
+__conf.PreflightTimeoutMs = {{ preflight_query_timeout_ms|to_json }};
 __conf.manateeIsCustomCNC = {{ manatee_is_custom_cnc|to_json }};
 {% endblock %}