From: =?utf-8?b?Ik1hcmNvIFRyZXZpc2FuIChUcmV2acOxbyki?= <mail@3v1n0.net>
Date: Thu, 23 Aug 2018 20:00:57 +0200
Subject: search: call XUbuntuCancel method on providers when no data is
 needed

Add XUbuntuCancel method to search providers and call it when a search provider
is still doing operations.
Ignore the result when the method does not exist or is cancelled.

This will allow to stop operations on providers.

Fixes LP: #1756826

Bug-GNOME: https://gitlab.gnome.org/GNOME/gnome-shell/issues/183
Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/bionic/+source/gnome-shell/+bug/1756826
Forwarded: not-needed
---
 .../org.gnome.ShellSearchProvider.xml              |  6 ++++
 .../org.gnome.ShellSearchProvider2.xml             |  6 ++++
 js/ui/remoteSearch.js                              | 12 ++++++++
 js/ui/search.js                                    | 33 ++++++++++++++++++++++
 4 files changed, 57 insertions(+)

diff --git a/data/dbus-interfaces/org.gnome.ShellSearchProvider.xml b/data/dbus-interfaces/org.gnome.ShellSearchProvider.xml
index 78ad305..393cb01 100644
--- a/data/dbus-interfaces/org.gnome.ShellSearchProvider.xml
+++ b/data/dbus-interfaces/org.gnome.ShellSearchProvider.xml
@@ -69,5 +69,11 @@
     <method name="ActivateResult">
       <arg type="s" name="identifier" direction="in" />
     </method>
+
+    <!--
+        XUbuntuCancel:
+        Cancel the current search operation
+    -->
+    <method name="XUbuntuCancel" />
   </interface>
 </node>
diff --git a/data/dbus-interfaces/org.gnome.ShellSearchProvider2.xml b/data/dbus-interfaces/org.gnome.ShellSearchProvider2.xml
index 9502340..8141bc0 100644
--- a/data/dbus-interfaces/org.gnome.ShellSearchProvider2.xml
+++ b/data/dbus-interfaces/org.gnome.ShellSearchProvider2.xml
@@ -83,5 +83,11 @@
       <arg type="as" name="terms" direction="in" />
       <arg type="u" name="timestamp" direction="in" />
     </method>
+
+    <!--
+        XUbuntuCancel:
+        Cancel the current search operation
+    -->
+    <method name="XUbuntuCancel" />
   </interface>
 </node>
diff --git a/js/ui/remoteSearch.js b/js/ui/remoteSearch.js
index 592dfe1..e50ded6 100644
--- a/js/ui/remoteSearch.js
+++ b/js/ui/remoteSearch.js
@@ -26,6 +26,7 @@ const SearchProviderIface = `
 <method name="ActivateResult">
     <arg type="s" direction="in" />
 </method>
+<method name="XUbuntuCancel" />
 </interface>
 </node>`;
 
@@ -54,6 +55,7 @@ const SearchProvider2Iface = `
     <arg type="as" direction="in" />
     <arg type="u" direction="in" />
 </method>
+<method name="XUbuntuCancel" />
 </interface>
 </node>`;
 
@@ -299,6 +301,16 @@ var RemoteSearchProvider = class {
         return resultMetas;
     }
 
+    async XUbuntuCancel(cancellable) {
+        try {
+            await this.proxy.XUbuntuCancelAsync(cancellable);
+        } catch (error) {
+            if (!error.matches(Gio.DBusError, Gio.DBusError.UNKNOWN_METHOD) &&
+                !error.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.CANCELLED))
+                log(`Received error from D-Bus search provider ${this.id} during XUbuntuCancel: ${error}`);
+        }
+    }
+
     activateResult(id) {
         this.proxy.ActivateResultAsync(id).catch(logError);
     }
diff --git a/js/ui/search.js b/js/ui/search.js
index 7d50ef2..53a812b 100644
--- a/js/ui/search.js
+++ b/js/ui/search.js
@@ -218,7 +218,9 @@ var SearchResultsBase = GObject.registerClass({
         this._cancellable.cancel();
         this._cancellable.reset();
 
+        this.provider.resultsMetasInProgress = true;
         const metas = await this.provider.getResultMetas(metasNeeded, this._cancellable);
+        this.provider.resultsMetasInProgress = this._cancellable.is_cancelled();
 
         if (this._cancellable.is_cancelled()) {
             if (metas.length > 0)
@@ -596,6 +598,10 @@ var SearchResultsView = GObject.registerClass({
 
         this._searchTimeoutId = 0;
         this._cancellable = new Gio.Cancellable();
+        this._searchCancelCancellable = new Gio.Cancellable();
+        const cancellableCancelledId = this._cancellable.connect(() =>
+            this._cancelSearchProviderRequest());
+        this.connect('destroy', () => this._cancellable.disconnect(cancellableCancelledId));
 
         this._registerProvider(new AppDisplay.AppSearchProvider());
 
@@ -644,11 +650,31 @@ var SearchResultsView = GObject.registerClass({
         }
     }
 
+    _cancelSearchProviderRequest() {
+        if (this._terms.length !== 0 || this._searchCancelTimeoutId)
+            return;
+
+        this._searchCancelTimeoutId = GLib.timeout_add(GLib.PRIORITY_DEFAULT, 100, () => {
+            Promise.all(this._providers.map(async provider => {
+                if (provider.isRemoteProvider &&
+                    (provider.searchInProgress || provider.resultsMetasInProgress)) {
+                    await provider.XUbuntuCancel(this._searchCancelCancellable);
+                    provider.searchInProgress = false;
+                    provider.resultsMetasInProgress = false;
+                }
+            })).catch(logError);
+
+            delete this._searchCancelTimeoutId;
+            return GLib.SOURCE_REMOVE;
+        });
+    }
+
     _reset() {
         this._terms = [];
         this._results = {};
         this._clearDisplay();
         this._clearSearchTimeout();
+        this._cancelSearchProviderRequest();
         this._defaultResult = null;
         this._startingSearch = false;
 
@@ -720,6 +746,13 @@ var SearchResultsView = GObject.registerClass({
         if (this._terms.length > 0)
             isSubSearch = searchString.indexOf(previousSearchString) == 0;
 
+        this._searchCancelCancellable.cancel();
+        this._searchCancelCancellable.reset();
+        if (this._searchCancelTimeoutId) {
+            GLib.source_remove(this._searchCancelTimeoutId);
+            delete this._searchCancelTimeoutId;
+        }
+
         this._terms = terms;
         this._isSubSearch = isSubSearch;
         this._updateSearchProgress();