ui/src/controller/logs_controller.ts - third_party/perfetto - Git at Google

 // 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 {Engine} from '../common/engine';
 import {
   LogBounds,
   LogBoundsKey,
   LogEntries,
   LogEntriesKey,
   LogExistsKey,
 } from '../common/logs';
 import {NUM, STR} from '../common/query_result';
 import {LogFilteringCriteria} from '../common/state';
 import {fromNs, TimeSpan, toNsCeil, toNsFloor} from '../common/time';
 import {publishTrackData} from '../frontend/publish';

 import {Controller} from './controller';
 import {App, globals} from './globals';

 async function updateLogBounds(
     engine: Engine, span: TimeSpan): Promise<LogBounds> {
   const vizStartNs = toNsFloor(span.start);
   const vizEndNs = toNsCeil(span.end);

   const countResult = await engine.query(`select
       ifnull(min(ts), 0) as minTs,
       ifnull(max(ts), 0) as maxTs,
       count(ts) as countTs
      from filtered_logs
         where ts >= ${vizStartNs}
         and ts <= ${vizEndNs}`);

   const countRow = countResult.firstRow({minTs: NUM, maxTs: NUM, countTs: NUM});

   const firstRowNs = countRow.minTs;
   const lastRowNs = countRow.maxTs;
   const total = countRow.countTs;

   const minResult = await engine.query(`
      select ifnull(max(ts), 0) as maxTs from filtered_logs where ts < ${
       vizStartNs}`);
   const startNs = minResult.firstRow({maxTs: NUM}).maxTs;

   const maxResult = await engine.query(`
      select ifnull(min(ts), 0) as minTs from filtered_logs where ts > ${
       vizEndNs}`);
   const endNs = maxResult.firstRow({minTs: NUM}).minTs;

   const startTs = startNs ? fromNs(startNs) : 0;
   const endTs = endNs ? fromNs(endNs) : Number.MAX_SAFE_INTEGER;
   const firstRowTs = firstRowNs ? fromNs(firstRowNs) : endTs;
   const lastRowTs = lastRowNs ? fromNs(lastRowNs) : startTs;
   return {
     startTs,
     endTs,
     firstRowTs,
     lastRowTs,
     total,
   };
 }

 async function updateLogEntries(
     engine: Engine, span: TimeSpan, pagination: Pagination):
     Promise<LogEntries> {
   const vizStartNs = toNsFloor(span.start);
   const vizEndNs = toNsCeil(span.end);
   const vizSqlBounds = `ts >= ${vizStartNs} and ts <= ${vizEndNs}`;

   const rowsResult = await engine.query(`
         select
           ts,
           prio,
           ifnull(tag, '[NULL]') as tag,
           ifnull(msg, '[NULL]') as msg
         from filtered_logs
         where ${vizSqlBounds}
         order by ts
         limit ${pagination.start}, ${pagination.count}
     `);

   const timestamps = [];
   const priorities = [];
   const tags = [];
   const messages = [];

   const it = rowsResult.iter({ts: NUM, prio: NUM, tag: STR, msg: STR});
   for (; it.valid(); it.next()) {
     timestamps.push(it.ts);
     priorities.push(it.prio);
     tags.push(it.tag);
     messages.push(it.msg);
   }

   return {
     offset: pagination.start,
     timestamps,
     priorities,
     tags,
     messages,
   };
 }

 class Pagination {
   private _offset: number;
   private _count: number;

   constructor(offset: number, count: number) {
     this._offset = offset;
     this._count = count;
   }

   get start() {
     return this._offset;
   }

   get count() {
     return this._count;
   }

   get end() {
     return this._offset + this._count;
   }

   contains(other: Pagination): boolean {
     return this.start <= other.start && other.end <= this.end;
   }

   grow(n: number): Pagination {
     const newStart = Math.max(0, this.start - n / 2);
     const newCount = this.count + n;
     return new Pagination(newStart, newCount);
   }
 }

 export interface LogsControllerArgs {
   engine: Engine;
   app: App;
 }

 /**
  * LogsController looks at three parts of the state:
  * 1. The visible trace window
  * 2. The requested offset and count the log lines to display
  * 3. The log filtering criteria.
  * And keeps two bits of published information up to date:
  * 1. The total number of log messages in visible range
  * 2. The logs lines that should be displayed
  * Based on the log filtering criteria, it also builds the filtered_logs view
  * and keeps it up to date.
  */
 export class LogsController extends Controller<'main'> {
   private app: App;
   private engine: Engine;
   private span: TimeSpan;
   private pagination: Pagination;
   private hasLogs = false;
   private logFilteringCriteria?: LogFilteringCriteria;
   private requestingData = false;
   private queuedRunRequest = false;

   constructor(args: LogsControllerArgs) {
     super('main');
     this.app = args.app;
     this.engine = args.engine;
     this.span = new TimeSpan(0, 10);
     this.pagination = new Pagination(0, 0);
     this.hasAnyLogs().then((exists) => {
       this.hasLogs = exists;
       publishTrackData({
         id: LogExistsKey,
         data: {
           exists,
         },
       });
     });
   }

   async hasAnyLogs() {
     const result = await this.engine.query(`
       select count(*) as cnt from android_logs
     `);
     return result.firstRow({cnt: NUM}).cnt > 0;
   }

   run() {
     if (!this.hasLogs) return;
     if (this.requestingData) {
       this.queuedRunRequest = true;
       return;
     }
     this.requestingData = true;
     this.updateLogTracks().finally(() => {
       this.requestingData = false;
       if (this.queuedRunRequest) {
         this.queuedRunRequest = false;
         this.run();
       }
     });
   }

   private async updateLogTracks() {
     const traceTime = this.app.state.frontendLocalState.visibleState;
     const newSpan = new TimeSpan(traceTime.startSec, traceTime.endSec);
     const oldSpan = this.span;

     const pagination = this.app.state.logsPagination;
     // This can occur when loading old traces.
     // TODO(hjd): Fix the problem of accessing state from a previous version of
     // the UI in a general way.
     if (pagination === undefined) {
       return;
     }

     const {offset, count} = pagination;
     const requestedPagination = new Pagination(offset, count);
     const oldPagination = this.pagination;

     const newFilteringCriteria =
         this.logFilteringCriteria !== globals.state.logFilteringCriteria;
     const needBoundsUpdate = !oldSpan.equals(newSpan) || newFilteringCriteria;
     const needEntriesUpdate =
         !oldPagination.contains(requestedPagination) || needBoundsUpdate;

     if (newFilteringCriteria) {
       this.logFilteringCriteria = globals.state.logFilteringCriteria;
       await this.engine.query('drop view if exists filtered_logs');
       await this.engine.query(`create view filtered_logs as
           select * from android_logs
           where prio >= ${this.logFilteringCriteria.minimumLevel}`);
     }

     if (needBoundsUpdate) {
       this.span = newSpan;
       const logBounds = await updateLogBounds(this.engine, newSpan);
       publishTrackData({
         id: LogBoundsKey,
         data: logBounds,
       });
     }

     if (needEntriesUpdate) {
       this.pagination = requestedPagination.grow(100);
       const logEntries =
           await updateLogEntries(this.engine, newSpan, this.pagination);
       publishTrackData({
         id: LogEntriesKey,
         data: logEntries,
       });
     }
   }
 }
	// 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 {Engine} from '../common/engine';
	import {
	LogBounds,
	LogBoundsKey,
	LogEntries,
	LogEntriesKey,
	LogExistsKey,
	} from '../common/logs';
	import {NUM, STR} from '../common/query_result';
	import {LogFilteringCriteria} from '../common/state';
	import {fromNs, TimeSpan, toNsCeil, toNsFloor} from '../common/time';
	import {publishTrackData} from '../frontend/publish';

	import {Controller} from './controller';
	import {App, globals} from './globals';

	async function updateLogBounds(
	engine: Engine, span: TimeSpan): Promise<LogBounds> {
	const vizStartNs = toNsFloor(span.start);
	const vizEndNs = toNsCeil(span.end);

	const countResult = await engine.query(`select
	ifnull(min(ts), 0) as minTs,
	ifnull(max(ts), 0) as maxTs,
	count(ts) as countTs
	from filtered_logs
	where ts >= ${vizStartNs}
	and ts <= ${vizEndNs}`);

	const countRow = countResult.firstRow({minTs: NUM, maxTs: NUM, countTs: NUM});

	const firstRowNs = countRow.minTs;
	const lastRowNs = countRow.maxTs;
	const total = countRow.countTs;

	const minResult = await engine.query(`
	select ifnull(max(ts), 0) as maxTs from filtered_logs where ts < ${
	vizStartNs}`);
	const startNs = minResult.firstRow({maxTs: NUM}).maxTs;

	const maxResult = await engine.query(`
	select ifnull(min(ts), 0) as minTs from filtered_logs where ts > ${
	vizEndNs}`);
	const endNs = maxResult.firstRow({minTs: NUM}).minTs;

	const startTs = startNs ? fromNs(startNs) : 0;
	const endTs = endNs ? fromNs(endNs) : Number.MAX_SAFE_INTEGER;
	const firstRowTs = firstRowNs ? fromNs(firstRowNs) : endTs;
	const lastRowTs = lastRowNs ? fromNs(lastRowNs) : startTs;
	return {
	startTs,
	endTs,
	firstRowTs,
	lastRowTs,
	total,
	};
	}

	async function updateLogEntries(
	engine: Engine, span: TimeSpan, pagination: Pagination):
	Promise<LogEntries> {
	const vizStartNs = toNsFloor(span.start);
	const vizEndNs = toNsCeil(span.end);
	const vizSqlBounds = `ts >= ${vizStartNs} and ts <= ${vizEndNs}`;

	const rowsResult = await engine.query(`
	select
	ts,
	prio,
	ifnull(tag, '[NULL]') as tag,
	ifnull(msg, '[NULL]') as msg
	from filtered_logs
	where ${vizSqlBounds}
	order by ts
	limit ${pagination.start}, ${pagination.count}
	`);

	const timestamps = [];
	const priorities = [];
	const tags = [];
	const messages = [];

	const it = rowsResult.iter({ts: NUM, prio: NUM, tag: STR, msg: STR});
	for (; it.valid(); it.next()) {
	timestamps.push(it.ts);
	priorities.push(it.prio);
	tags.push(it.tag);
	messages.push(it.msg);
	}

	return {
	offset: pagination.start,
	timestamps,
	priorities,
	tags,
	messages,
	};
	}

	class Pagination {
	private _offset: number;
	private _count: number;

	constructor(offset: number, count: number) {
	this._offset = offset;
	this._count = count;
	}

	get start() {
	return this._offset;
	}

	get count() {
	return this._count;
	}

	get end() {
	return this._offset + this._count;
	}

	contains(other: Pagination): boolean {
	return this.start <= other.start && other.end <= this.end;
	}

	grow(n: number): Pagination {
	const newStart = Math.max(0, this.start - n / 2);
	const newCount = this.count + n;
	return new Pagination(newStart, newCount);
	}
	}

	export interface LogsControllerArgs {
	engine: Engine;
	app: App;
	}

	/**
	* LogsController looks at three parts of the state:
	* 1. The visible trace window
	* 2. The requested offset and count the log lines to display
	* 3. The log filtering criteria.
	* And keeps two bits of published information up to date:
	* 1. The total number of log messages in visible range
	* 2. The logs lines that should be displayed
	* Based on the log filtering criteria, it also builds the filtered_logs view
	* and keeps it up to date.
	*/
	export class LogsController extends Controller<'main'> {
	private app: App;
	private engine: Engine;
	private span: TimeSpan;
	private pagination: Pagination;
	private hasLogs = false;
	private logFilteringCriteria?: LogFilteringCriteria;
	private requestingData = false;
	private queuedRunRequest = false;

	constructor(args: LogsControllerArgs) {
	super('main');
	this.app = args.app;
	this.engine = args.engine;
	this.span = new TimeSpan(0, 10);
	this.pagination = new Pagination(0, 0);
	this.hasAnyLogs().then((exists) => {
	this.hasLogs = exists;
	publishTrackData({
	id: LogExistsKey,
	data: {
	exists,
	},
	});
	});
	}

	async hasAnyLogs() {
	const result = await this.engine.query(`
	select count(*) as cnt from android_logs
	`);
	return result.firstRow({cnt: NUM}).cnt > 0;
	}

	run() {
	if (!this.hasLogs) return;
	if (this.requestingData) {
	this.queuedRunRequest = true;
	return;
	}
	this.requestingData = true;
	this.updateLogTracks().finally(() => {
	this.requestingData = false;
	if (this.queuedRunRequest) {
	this.queuedRunRequest = false;
	this.run();
	}
	});
	}

	private async updateLogTracks() {
	const traceTime = this.app.state.frontendLocalState.visibleState;
	const newSpan = new TimeSpan(traceTime.startSec, traceTime.endSec);
	const oldSpan = this.span;

	const pagination = this.app.state.logsPagination;
	// This can occur when loading old traces.
	// TODO(hjd): Fix the problem of accessing state from a previous version of
	// the UI in a general way.
	if (pagination === undefined) {
	return;
	}

	const {offset, count} = pagination;
	const requestedPagination = new Pagination(offset, count);
	const oldPagination = this.pagination;

	const newFilteringCriteria =
	this.logFilteringCriteria !== globals.state.logFilteringCriteria;
	const needBoundsUpdate = !oldSpan.equals(newSpan) \|\| newFilteringCriteria;
	const needEntriesUpdate =
	!oldPagination.contains(requestedPagination) \|\| needBoundsUpdate;

	if (newFilteringCriteria) {
	this.logFilteringCriteria = globals.state.logFilteringCriteria;
	await this.engine.query('drop view if exists filtered_logs');
	await this.engine.query(`create view filtered_logs as
	select * from android_logs
	where prio >= ${this.logFilteringCriteria.minimumLevel}`);
	}

	if (needBoundsUpdate) {
	this.span = newSpan;
	const logBounds = await updateLogBounds(this.engine, newSpan);
	publishTrackData({
	id: LogBoundsKey,
	data: logBounds,
	});
	}

	if (needEntriesUpdate) {
	this.pagination = requestedPagination.grow(100);
	const logEntries =
	await updateLogEntries(this.engine, newSpan, this.pagination);
	publishTrackData({
	id: LogEntriesKey,
	data: logEntries,
	});
	}
	}
	}