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// Copyright (C) 2023 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import m from 'mithril';
import {StringListPatch} from 'src/common/state';
import {assertExists} from '../base/logging';
import {Actions} from '../common/actions';
import {colorForString} from '../common/colorizer';
import {formatTimestamp} from '../common/time';
import {globals} from './globals';
import {Panel} from './panel';
import {
MultiSelect,
MultiSelectDiff,
Option as MultiSelectOption,
} from './widgets/multiselect';
import {PopupPosition} from './widgets/popup';
const ROW_H = 20;
const PAGE_SIZE = 250;
// This class is quite a weird one. The state looks something like this:
//
// view() -> renders the panel from the data, for now we have no idea what size
// the scroll window is going to be so we don't know how many rows to ask for,
// and the number of rendered rows in our state is likely going to be 0 or wrong
//
// oncreate() -> we now know how many rows we need to display and our scroll
// offset. This is where we as our controller to update the rows, which could
// take some time. Record the first and last row we can see. Attach scroll
// handler to the scrolly window here.
//
// onScroll() -> we know the window has been scrolled, we need to see if things
// have changed enough to constitute a redraw.
// Another call to view() can come at any time, as a reusult of the controller
// giving us some data.
//
export class FtracePanel extends Panel<{}> {
private page: number = 0;
private pageCount: number = 0;
view(_: m.CVnode<{}>) {
return m(
'.ftrace-panel',
m(
'.sticky',
[
this.renderRowsLabel(),
this.renderFilterPanel(),
],
),
this.renderRows(),
);
}
private scrollContainer(dom: Element): HTMLElement {
const el = dom.parentElement!.parentElement!.parentElement;
return assertExists(el);
}
oncreate({dom}: m.CVnodeDOM) {
const sc = this.scrollContainer(dom);
sc.addEventListener('scroll', this.onScroll);
this.recomputeVisibleRowsAndUpdate(sc);
}
onupdate({dom}: m.CVnodeDOM) {
const sc = this.scrollContainer(dom);
this.recomputeVisibleRowsAndUpdate(sc);
}
recomputeVisibleRowsAndUpdate(scrollContainer: HTMLElement) {
const prevPage = this.page;
const prevPageCount = this.pageCount;
const visibleRowOffset = Math.floor(scrollContainer.scrollTop / ROW_H);
const visibleRowCount = Math.ceil(scrollContainer.clientHeight / ROW_H);
// Work out which "page" we're on
this.page = Math.floor(visibleRowOffset / PAGE_SIZE) - 1;
this.pageCount = Math.ceil(visibleRowCount / PAGE_SIZE) + 2;
if (this.page !== prevPage || this.pageCount !== prevPageCount) {
globals.dispatch(Actions.updateFtracePagination({
offset: Math.max(0, this.page) * PAGE_SIZE,
count: this.pageCount * PAGE_SIZE,
}));
}
}
onremove({dom}: m.CVnodeDOM) {
const sc = this.scrollContainer(dom);
sc.removeEventListener('scroll', this.onScroll);
}
onScroll = (e: Event) => {
const scrollContainer = e.target as HTMLElement;
this.recomputeVisibleRowsAndUpdate(scrollContainer);
};
onRowOver(ts: number) {
globals.dispatch(Actions.setHoverCursorTimestamp({ts}));
}
onRowOut() {
globals.dispatch(Actions.setHoverCursorTimestamp({ts: -1}));
}
private renderRowsLabel() {
if (globals.ftracePanelData) {
const {numEvents} = globals.ftracePanelData;
return m('.ftrace-rows-label', `Ftrace Events (${numEvents})`);
} else {
return m('.ftrace-rows-label', 'Ftrace Rows');
}
}
private renderFilterPanel() {
if (!globals.ftraceCounters) {
return null;
}
const options: MultiSelectOption[] =
globals.ftraceCounters.map(({name, count}) => {
return {
id: name,
name: `${name} (${count})`,
checked: !globals.state.ftraceFilter.excludedNames.some(
(excluded: string) => excluded === name),
};
});
return m(
MultiSelect,
{
label: 'Filter by name',
icon: 'filter_list_alt',
popupPosition: PopupPosition.Top,
options,
onChange: (diffs: MultiSelectDiff[]) => {
const excludedNames: StringListPatch[] = diffs.map(
({id, checked}) => [checked ? 'remove' : 'add', id],
);
globals.dispatchMultiple([
Actions.updateFtraceFilter({excludedNames}),
Actions.requestTrackReload({}),
]);
},
},
);
}
// Render all the rows including the first title row
private renderRows() {
const data = globals.ftracePanelData;
const rows: m.Children = [];
rows.push(m(
`.row`,
m('.cell.row-header', 'Timestamp'),
m('.cell.row-header', 'Name'),
m('.cell.row-header', 'CPU'),
m('.cell.row-header', 'Process'),
m('.cell.row-header', 'Args'),
));
if (data) {
const {events, offset, numEvents} = data;
for (let i = 0; i < events.length; i++) {
const {ts, name, cpu, process, args} = events[i];
const timestamp =
formatTimestamp(ts / 1e9 - globals.state.traceTime.startSec);
const rank = i + offset;
const color = colorForString(name);
const hsl = `hsl(
${color.h},
${color.s - 20}%,
${Math.min(color.l + 10, 60)}%
)`;
rows.push(m(
`.row`,
{
style: {top: `${(rank + 1.0) * ROW_H}px`},
onmouseover: this.onRowOver.bind(this, ts / 1e9),
onmouseout: this.onRowOut.bind(this),
},
m('.cell', timestamp),
m('.cell', m('span.colour', {style: {background: hsl}}), name),
m('.cell', cpu),
m('.cell', process),
m('.cell', args),
));
}
return m('.rows', {style: {height: `${numEvents * ROW_H}px`}}, rows);
} else {
return m('.rows', rows);
}
}
renderCanvas() {}
}
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