aws-cdk
Version:
CDK Toolkit, the command line tool for CDK apps
166 lines • 21.6 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.CloudWatchLogEventMonitor = void 0;
const util = require("util");
const chalk = require("chalk");
const logging_1 = require("../../logging");
const arrays_1 = require("../../util/arrays");
/**
* After reading events from all CloudWatch log groups
* how long should we wait to read more events.
*
* If there is some error with reading events (i.e. Throttle)
* then this is also how long we wait until we try again
*/
const SLEEP = 2000;
class CloudWatchLogEventMonitor {
constructor(startTime) {
/**
* Map of environment (account:region) to LogGroupsAccessSettings
*/
this.envsLogGroupsAccessSettings = new Map();
this.active = false;
this.startTime = startTime?.getTime() ?? Date.now();
}
/**
* resume reading/printing events
*/
activate() {
this.active = true;
this.scheduleNextTick(0);
}
/**
* deactivates the monitor so no new events are read
* use case for this is when we are in the middle of performing a deployment
* and don't want to interweave all the logs together with the CFN
* deployment logs
*
* Also resets the start time to be when the new deployment was triggered
* and clears the list of tracked log groups
*/
deactivate() {
this.active = false;
this.startTime = Date.now();
this.envsLogGroupsAccessSettings.clear();
}
/**
* Adds CloudWatch log groups to read log events from.
* Since we could be watching multiple stacks that deploy to
* multiple environments (account+region), we need to store a list of log groups
* per env along with the SDK object that has access to read from
* that environment.
*/
addLogGroups(env, sdk, logGroupNames) {
const awsEnv = `${env.account}:${env.region}`;
const logGroupsStartTimes = logGroupNames.reduce((acc, groupName) => {
acc[groupName] = this.startTime;
return acc;
}, {});
this.envsLogGroupsAccessSettings.set(awsEnv, {
sdk,
logGroupsStartTimes: {
...this.envsLogGroupsAccessSettings.get(awsEnv)?.logGroupsStartTimes,
...logGroupsStartTimes,
},
});
}
scheduleNextTick(sleep) {
setTimeout(() => void this.tick(), sleep);
}
async tick() {
// excluding from codecoverage because this
// doesn't always run (depends on timing)
/* istanbul ignore next */
if (!this.active) {
return;
}
try {
const events = (0, arrays_1.flatten)(await this.readNewEvents());
events.forEach((event) => {
this.print(event);
});
}
catch (e) {
(0, logging_1.error)('Error occurred while monitoring logs: %s', e);
}
this.scheduleNextTick(SLEEP);
}
/**
* Reads all new log events from a set of CloudWatch Log Groups
* in parallel
*/
async readNewEvents() {
const promises = [];
for (const settings of this.envsLogGroupsAccessSettings.values()) {
for (const group of Object.keys(settings.logGroupsStartTimes)) {
promises.push(this.readEventsFromLogGroup(settings, group));
}
}
// Limited set of log groups
// eslint-disable-next-line @cdklabs/promiseall-no-unbounded-parallelism
return Promise.all(promises);
}
/**
* Print out a cloudwatch event
*/
print(event) {
(0, logging_1.info)(util.format('[%s] %s %s', chalk.blue(event.logGroupName), chalk.yellow(event.timestamp.toLocaleTimeString()), event.message.trim()));
}
/**
* Reads all new log events from a CloudWatch Log Group
* starting at either the time the hotswap was triggered or
* when the last event was read on the previous tick
*/
async readEventsFromLogGroup(logGroupsAccessSettings, logGroupName) {
const events = [];
// log events from some service are ingested faster than others
// so we need to track the start/end time for each log group individually
// to make sure that we process all events from each log group
const startTime = logGroupsAccessSettings.logGroupsStartTimes[logGroupName] ?? this.startTime;
let endTime = startTime;
try {
const response = await logGroupsAccessSettings.sdk.cloudWatchLogs().filterLogEvents({
logGroupName: logGroupName,
limit: 100,
startTime: startTime,
});
const filteredEvents = response.events ?? [];
for (const event of filteredEvents) {
if (event.message) {
events.push({
message: event.message,
logGroupName,
timestamp: event.timestamp ? new Date(event.timestamp) : new Date(),
});
if (event.timestamp && endTime < event.timestamp) {
endTime = event.timestamp;
}
}
}
// As long as there are _any_ events in the log group `filterLogEvents` will return a nextToken.
// This is true even if these events are before `startTime`. So if we have 100 events and a nextToken
// then assume that we have hit the limit and let the user know some messages have been suppressed.
// We are essentially showing them a sampling (10000 events printed out is not very useful)
if (filteredEvents.length === 100 && response.nextToken) {
events.push({
message: '>>> `watch` shows only the first 100 log messages - the rest have been truncated...',
logGroupName,
timestamp: new Date(endTime),
});
}
}
catch (e) {
// with Lambda functions the CloudWatch is not created
// until something is logged, so just keep polling until
// there is somthing to find
if (e.name === 'ResourceNotFoundException') {
return [];
}
throw e;
}
logGroupsAccessSettings.logGroupsStartTimes[logGroupName] = endTime + 1;
return events;
}
}
exports.CloudWatchLogEventMonitor = CloudWatchLogEventMonitor;
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* as util from 'util';\nimport * as cxapi from '@aws-cdk/cx-api';\nimport * as chalk from 'chalk';\nimport { info, error } from '../../logging';\nimport { flatten } from '../../util/arrays';\nimport type { SDK } from '../aws-auth';\n\n/**\n * After reading events from all CloudWatch log groups\n * how long should we wait to read more events.\n *\n * If there is some error with reading events (i.e. Throttle)\n * then this is also how long we wait until we try again\n */\nconst SLEEP = 2_000;\n\n/**\n * Represents a CloudWatch Log Event that will be\n * printed to the terminal\n */\ninterface CloudWatchLogEvent {\n  /**\n   * The log event message\n   */\n  readonly message: string;\n\n  /**\n   * The name of the log group\n   */\n  readonly logGroupName: string;\n\n  /**\n   * The time at which the event occurred\n   */\n  readonly timestamp: Date;\n}\n\n/**\n * Configuration tracking information on the log groups that are\n * being monitored\n */\ninterface LogGroupsAccessSettings {\n  /**\n   * The SDK for a given environment (account/region)\n   */\n  readonly sdk: SDK;\n\n  /**\n   * A map of log groups and associated startTime in a given account.\n   *\n   * The monitor will read events from the log group starting at the\n   * associated startTime\n   */\n  readonly logGroupsStartTimes: { [logGroupName: string]: number };\n}\n\nexport class CloudWatchLogEventMonitor {\n  /**\n   * Determines which events not to display\n   */\n  private startTime: number;\n\n  /**\n   * Map of environment (account:region) to LogGroupsAccessSettings\n   */\n  private readonly envsLogGroupsAccessSettings = new Map<string, LogGroupsAccessSettings>();\n\n  private active = false;\n\n  constructor(startTime?: Date) {\n    this.startTime = startTime?.getTime() ?? Date.now();\n  }\n\n  /**\n   * resume reading/printing events\n   */\n  public activate(): void {\n    this.active = true;\n    this.scheduleNextTick(0);\n  }\n\n  /**\n   * deactivates the monitor so no new events are read\n   * use case for this is when we are in the middle of performing a deployment\n   * and don't want to interweave all the logs together with the CFN\n   * deployment logs\n   *\n   * Also resets the start time to be when the new deployment was triggered\n   * and clears the list of tracked log groups\n   */\n  public deactivate(): void {\n    this.active = false;\n    this.startTime = Date.now();\n    this.envsLogGroupsAccessSettings.clear();\n  }\n\n  /**\n   * Adds CloudWatch log groups to read log events from.\n   * Since we could be watching multiple stacks that deploy to\n   * multiple environments (account+region), we need to store a list of log groups\n   * per env along with the SDK object that has access to read from\n   * that environment.\n   */\n  public addLogGroups(env: cxapi.Environment, sdk: SDK, logGroupNames: string[]): void {\n    const awsEnv = `${env.account}:${env.region}`;\n    const logGroupsStartTimes = logGroupNames.reduce(\n      (acc, groupName) => {\n        acc[groupName] = this.startTime;\n        return acc;\n      },\n      {} as { [logGroupName: string]: number },\n    );\n    this.envsLogGroupsAccessSettings.set(awsEnv, {\n      sdk,\n      logGroupsStartTimes: {\n        ...this.envsLogGroupsAccessSettings.get(awsEnv)?.logGroupsStartTimes,\n        ...logGroupsStartTimes,\n      },\n    });\n  }\n\n  private scheduleNextTick(sleep: number): void {\n    setTimeout(() => void this.tick(), sleep);\n  }\n\n  private async tick(): Promise<void> {\n    // excluding from codecoverage because this\n    // doesn't always run (depends on timing)\n    /* istanbul ignore next */\n    if (!this.active) {\n      return;\n    }\n    try {\n      const events = flatten(await this.readNewEvents());\n      events.forEach((event) => {\n        this.print(event);\n      });\n    } catch (e) {\n      error('Error occurred while monitoring logs: %s', e);\n    }\n\n    this.scheduleNextTick(SLEEP);\n  }\n\n  /**\n   * Reads all new log events from a set of CloudWatch Log Groups\n   * in parallel\n   */\n  private async readNewEvents(): Promise<Array<Array<CloudWatchLogEvent>>> {\n    const promises: Array<Promise<Array<CloudWatchLogEvent>>> = [];\n    for (const settings of this.envsLogGroupsAccessSettings.values()) {\n      for (const group of Object.keys(settings.logGroupsStartTimes)) {\n        promises.push(this.readEventsFromLogGroup(settings, group));\n      }\n    }\n    // Limited set of log groups\n    // eslint-disable-next-line @cdklabs/promiseall-no-unbounded-parallelism\n    return Promise.all(promises);\n  }\n\n  /**\n   * Print out a cloudwatch event\n   */\n  private print(event: CloudWatchLogEvent): void {\n    info(\n      util.format(\n        '[%s] %s %s',\n        chalk.blue(event.logGroupName),\n        chalk.yellow(event.timestamp.toLocaleTimeString()),\n        event.message.trim(),\n      ),\n    );\n  }\n\n  /**\n   * Reads all new log events from a CloudWatch Log Group\n   * starting at either the time the hotswap was triggered or\n   * when the last event was read on the previous tick\n   */\n  private async readEventsFromLogGroup(\n    logGroupsAccessSettings: LogGroupsAccessSettings,\n    logGroupName: string,\n  ): Promise<Array<CloudWatchLogEvent>> {\n    const events: CloudWatchLogEvent[] = [];\n\n    // log events from some service are ingested faster than others\n    // so we need to track the start/end time for each log group individually\n    // to make sure that we process all events from each log group\n    const startTime = logGroupsAccessSettings.logGroupsStartTimes[logGroupName] ?? this.startTime;\n    let endTime = startTime;\n    try {\n      const response = await logGroupsAccessSettings.sdk.cloudWatchLogs().filterLogEvents({\n        logGroupName: logGroupName,\n        limit: 100,\n        startTime: startTime,\n      });\n      const filteredEvents = response.events ?? [];\n\n      for (const event of filteredEvents) {\n        if (event.message) {\n          events.push({\n            message: event.message,\n            logGroupName,\n            timestamp: event.timestamp ? new Date(event.timestamp) : new Date(),\n          });\n\n          if (event.timestamp && endTime < event.timestamp) {\n            endTime = event.timestamp;\n          }\n        }\n      }\n      // As long as there are _any_ events in the log group `filterLogEvents` will return a nextToken.\n      // This is true even if these events are before `startTime`. So if we have 100 events and a nextToken\n      // then assume that we have hit the limit and let the user know some messages have been suppressed.\n      // We are essentially showing them a sampling (10000 events printed out is not very useful)\n      if (filteredEvents.length === 100 && response.nextToken) {\n        events.push({\n          message: '>>> `watch` shows only the first 100 log messages - the rest have been truncated...',\n          logGroupName,\n          timestamp: new Date(endTime),\n        });\n      }\n    } catch (e: any) {\n      // with Lambda functions the CloudWatch is not created\n      // until something is logged, so just keep polling until\n      // there is somthing to find\n      if (e.name === 'ResourceNotFoundException') {\n        return [];\n      }\n      throw e;\n    }\n    logGroupsAccessSettings.logGroupsStartTimes[logGroupName] = endTime + 1;\n    return events;\n  }\n}\n"]}