ui/src/tracks/android_log/frontend.ts

// Copyright (C) 2019 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 {TrackState} from '../../common/state';
import {checkerboardExcept} from '../../frontend/checkerboard';
import {globals} from '../../frontend/globals';
import {Track} from '../../frontend/track';
import {trackRegistry} from '../../frontend/track_registry';

import {ANDROID_LOGS_TRACK_KIND, Config, Data} from './common';

interface LevelCfg {
  color: string;
  prios: number[];
}

const LEVELS: LevelCfg[] = [
  {color: 'hsl(122, 39%, 49%)', prios: [0, 1, 2, 3]},  // Up to DEBUG: Green.
  {color: 'hsl(0, 0%, 70%)', prios: [4]},              // 4 (INFO) -> Gray.
  {color: 'hsl(45, 100%, 51%)', prios: [5]},           // 5 (WARN) -> Amber.
  {color: 'hsl(4, 90%, 58%)', prios: [6]},             // 6 (ERROR) -> Red.
  {color: 'hsl(291, 64%, 42%)', prios: [7]},           // 7 (FATAL) -> Purple
];

const MARGIN_TOP = 2;
const RECT_HEIGHT = 35;
const EVT_PX = 2;  // Width of an event tick in pixels.


class AndroidLogTrack extends Track<Config, Data> {
  static readonly kind = ANDROID_LOGS_TRACK_KIND;
  static create(trackState: TrackState): AndroidLogTrack {
    return new AndroidLogTrack(trackState);
  }

  constructor(trackState: TrackState) {
    super(trackState);
  }

  renderCanvas(ctx: CanvasRenderingContext2D): void {
    const {timeScale, visibleWindowTime} = globals.frontendLocalState;

    const data = this.data();

    if (data === undefined) return;  // Can't possibly draw anything.

    const dataStartPx = timeScale.timeToPx(data.start);
    const dataEndPx = timeScale.timeToPx(data.end);
    const visibleStartPx = timeScale.timeToPx(visibleWindowTime.start);
    const visibleEndPx = timeScale.timeToPx(visibleWindowTime.end);

    checkerboardExcept(
        ctx,
        this.getHeight(),
        visibleStartPx,
        visibleEndPx,
        dataStartPx,
        dataEndPx);

    const quantWidth =
        Math.max(EVT_PX, timeScale.deltaTimeToPx(data.resolution));
    const blockH = RECT_HEIGHT / LEVELS.length;
    for (let i = 0; i < data.timestamps.length; i++) {
      for (let lev = 0; lev < LEVELS.length; lev++) {
        let hasEventsForCurColor = false;
        for (const prio of LEVELS[lev].prios) {
          if (data.priorities[i] & (1 << prio)) hasEventsForCurColor = true;
        }
        if (!hasEventsForCurColor) continue;
        ctx.fillStyle = LEVELS[lev].color;
        const px = Math.floor(timeScale.timeToPx(data.timestamps[i]));
        ctx.fillRect(px, MARGIN_TOP + blockH * lev, quantWidth, blockH);
      }  // for(lev)
    }    // for (timestamps)
  }
}

trackRegistry.register(AndroidLogTrack);