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statistics.ts
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statistics.ts
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import { ErrorTracker } from '@crawlee/utils';
import ow from 'ow';
import { Configuration } from '../configuration';
import type { EventManager } from '../events/event_manager';
import { EventType } from '../events/event_manager';
import { log as defaultLog } from '../log';
import { KeyValueStore } from '../storages/key_value_store';
/**
* @ignore
*/
class Job {
private lastRunAt: number | null = null;
private runs = 0;
private durationMillis?: number;
run() {
this.lastRunAt = Date.now();
return ++this.runs;
}
finish() {
this.durationMillis = Date.now() - this.lastRunAt!;
return this.durationMillis;
}
retryCount() {
return Math.max(0, this.runs - 1);
}
}
const errorTrackerConfig = {
showErrorCode: true,
showErrorName: true,
showStackTrace: true,
showFullStack: false,
showErrorMessage: true,
showFullMessage: false,
};
/**
* The statistics class provides an interface to collecting and logging run
* statistics for requests.
*
* All statistic information is saved on key value store
* under the key `SDK_CRAWLER_STATISTICS_*`, persists between
* migrations and abort/resurrect
*
* @category Crawlers
*/
export class Statistics {
private static id = 0;
/**
* An error tracker for final retry errors.
*/
errorTracker = new ErrorTracker(errorTrackerConfig);
/**
* An error tracker for retry errors prior to the final retry.
*/
errorTrackerRetry = new ErrorTracker(errorTrackerConfig);
/**
* Statistic instance id.
*/
readonly id = Statistics.id++; // assign an id while incrementing so it can be saved/restored from KV
/**
* Current statistic state used for doing calculations on {@apilink Statistics.calculate} calls
*/
state!: StatisticState;
/**
* Contains the current retries histogram. Index 0 means 0 retries, index 2, 2 retries, and so on
*/
readonly requestRetryHistogram: number[] = [];
private keyValueStore?: KeyValueStore = undefined;
private persistStateKey = `SDK_CRAWLER_STATISTICS_${this.id}`;
private logIntervalMillis: number;
private logMessage: string;
private listener: () => Promise<void>;
private requestsInProgress = new Map<number | string, Job>();
private readonly log = defaultLog.child({ prefix: 'Statistics' });
private instanceStart!: number;
private logInterval: unknown;
private events: EventManager;
/**
* @internal
*/
constructor(options: StatisticsOptions = {}) {
ow(options, ow.object.exactShape({
logIntervalSecs: ow.optional.number,
logMessage: ow.optional.string,
keyValueStore: ow.optional.object,
config: ow.optional.object,
}));
const {
logIntervalSecs = 60,
logMessage = 'Statistics',
keyValueStore,
config = Configuration.getGlobalConfig(),
} = options;
this.logIntervalMillis = logIntervalSecs * 1000;
this.logMessage = logMessage;
this.keyValueStore = keyValueStore;
this.listener = this.persistState.bind(this);
this.events = config.getEventManager();
// initialize by "resetting"
this.reset();
}
/**
* Set the current statistic instance to pristine values
*/
reset() {
this.errorTracker.reset();
this.errorTrackerRetry.reset();
this.state = {
requestsFinished: 0,
requestsFailed: 0,
requestsRetries: 0,
requestsFailedPerMinute: 0,
requestsFinishedPerMinute: 0,
requestMinDurationMillis: Infinity,
requestMaxDurationMillis: 0,
requestTotalFailedDurationMillis: 0,
requestTotalFinishedDurationMillis: 0,
crawlerStartedAt: null,
crawlerFinishedAt: null,
statsPersistedAt: null,
crawlerRuntimeMillis: 0,
requestsWithStatusCode: {},
errors: this.errorTracker.result,
retryErrors: this.errorTrackerRetry.result,
};
this.requestRetryHistogram.length = 0;
this.requestsInProgress.clear();
this.instanceStart = Date.now();
this._teardown();
}
async resetStore() {
if (!this.keyValueStore) {
return;
}
await this.keyValueStore.setValue(this.persistStateKey, null);
}
/**
* Increments the status code counter.
*/
registerStatusCode(code: number) {
const s = String(code);
if (this.state.requestsWithStatusCode[s] === undefined) {
this.state.requestsWithStatusCode[s] = 0;
}
this.state.requestsWithStatusCode[s]++;
}
/**
* Starts a job
* @ignore
*/
startJob(id: number | string) {
let job = this.requestsInProgress.get(id);
if (!job) job = new Job();
job.run();
this.requestsInProgress.set(id, job);
}
/**
* Mark job as finished and sets the state
* @ignore
*/
finishJob(id: number | string) {
const job = this.requestsInProgress.get(id);
if (!job) return;
const jobDurationMillis = job.finish();
this.state.requestsFinished++;
this.state.requestTotalFinishedDurationMillis += jobDurationMillis;
this._saveRetryCountForJob(job);
if (jobDurationMillis < this.state.requestMinDurationMillis) this.state.requestMinDurationMillis = jobDurationMillis;
if (jobDurationMillis > this.state.requestMaxDurationMillis) this.state.requestMaxDurationMillis = jobDurationMillis;
this.requestsInProgress.delete(id);
}
/**
* Mark job as failed and sets the state
* @ignore
*/
failJob(id: number | string) {
const job = this.requestsInProgress.get(id);
if (!job) return;
this.state.requestTotalFailedDurationMillis += job.finish();
this.state.requestsFailed++;
this._saveRetryCountForJob(job);
this.requestsInProgress.delete(id);
}
/**
* Calculate the current statistics
*/
calculate() {
const {
requestsFailed,
requestsFinished,
requestTotalFailedDurationMillis,
requestTotalFinishedDurationMillis,
} = this.state;
const totalMillis = Date.now() - this.instanceStart;
const totalMinutes = totalMillis / 1000 / 60;
return {
requestAvgFailedDurationMillis: Math.round(requestTotalFailedDurationMillis / requestsFailed) || Infinity,
requestAvgFinishedDurationMillis: Math.round(requestTotalFinishedDurationMillis / requestsFinished) || Infinity,
requestsFinishedPerMinute: Math.round(requestsFinished / totalMinutes) || 0,
requestsFailedPerMinute: Math.floor(requestsFailed / totalMinutes) || 0,
requestTotalDurationMillis: requestTotalFinishedDurationMillis + requestTotalFailedDurationMillis,
requestsTotal: requestsFailed + requestsFinished,
crawlerRuntimeMillis: totalMillis,
};
}
/**
* Initializes the key value store for persisting the statistics,
* displaying the current state in predefined intervals
*/
async startCapturing() {
this.keyValueStore ??= await KeyValueStore.open();
await this._maybeLoadStatistics();
if (this.state.crawlerStartedAt === null) {
this.state.crawlerStartedAt = new Date();
}
this.events.on(EventType.PERSIST_STATE, this.listener);
this.logInterval = setInterval(() => {
this.log.info(this.logMessage, {
...this.calculate(),
retryHistogram: this.requestRetryHistogram,
});
}, this.logIntervalMillis);
}
/**
* Stops logging and remove event listeners, then persist
*/
async stopCapturing() {
this._teardown();
this.state.crawlerFinishedAt = new Date();
await this.persistState();
}
protected _saveRetryCountForJob(job: Job) {
const retryCount = job.retryCount();
if (retryCount > 0) this.state.requestsRetries++;
this.requestRetryHistogram[retryCount] = this.requestRetryHistogram[retryCount]
? this.requestRetryHistogram[retryCount] + 1
: 1;
}
/**
* Persist internal state to the key value store
*/
async persistState() {
// this might be called before startCapturing was called without using await, should not crash
if (!this.keyValueStore) {
return;
}
this.log.debug('Persisting state', { persistStateKey: this.persistStateKey });
await this.keyValueStore.setValue(this.persistStateKey, this.toJSON());
}
/**
* Loads the current statistic from the key value store if any
*/
protected async _maybeLoadStatistics() {
// this might be called before startCapturing was called without using await, should not crash
if (!this.keyValueStore) {
return;
}
const savedState = await this.keyValueStore.getValue<StatisticPersistedState>(this.persistStateKey);
if (!savedState) return;
// We saw a run where the requestRetryHistogram was not iterable and crashed
// the crawler. Adding some logging to monitor this problem in the future.
if (!Array.isArray(savedState.requestRetryHistogram)) {
this.log.warning('Received invalid state from Key-value store.', {
persistStateKey: this.persistStateKey,
state: savedState,
});
}
this.log.debug('Recreating state from KeyValueStore', { persistStateKey: this.persistStateKey });
// the `requestRetryHistogram` array might be very large, we could end up with
// `RangeError: Maximum call stack size exceeded` if we use `a.push(...b)`
savedState.requestRetryHistogram.forEach((idx) => this.requestRetryHistogram.push(idx));
this.state.requestsFinished = savedState.requestsFinished;
this.state.requestsFailed = savedState.requestsFailed;
this.state.requestsRetries = savedState.requestsRetries;
this.state.requestTotalFailedDurationMillis = savedState.requestTotalFailedDurationMillis;
this.state.requestTotalFinishedDurationMillis = savedState.requestTotalFinishedDurationMillis;
this.state.requestMinDurationMillis = savedState.requestMinDurationMillis;
this.state.requestMaxDurationMillis = savedState.requestMaxDurationMillis;
// persisted state uses ISO date strings
this.state.crawlerFinishedAt = savedState.crawlerFinishedAt ? new Date(savedState.crawlerFinishedAt) : null;
this.state.crawlerStartedAt = savedState.crawlerStartedAt ? new Date(savedState.crawlerStartedAt) : null;
this.state.statsPersistedAt = savedState.statsPersistedAt ? new Date(savedState.statsPersistedAt) : null;
this.state.crawlerRuntimeMillis = savedState.crawlerRuntimeMillis;
this.instanceStart = Date.now() - (+this.state.statsPersistedAt! - savedState.crawlerLastStartTimestamp);
this.log.debug('Loaded from KeyValueStore');
}
protected _teardown(): void {
// this can be called before a call to startCapturing happens (or in a 'finally' block)
this.events.off(EventType.PERSIST_STATE, this.listener);
if (this.logInterval) {
clearInterval(this.logInterval as number);
this.logInterval = null;
}
}
/**
* Make this class serializable when called with `JSON.stringify(statsInstance)` directly
* or through `keyValueStore.setValue('KEY', statsInstance)`
*/
toJSON(): StatisticPersistedState {
// merge all the current state information that can be used from the outside
// without the need to reconstruct for the sake of stats.calculate()
// omit duplicated information
const result = {
...this.state,
crawlerLastStartTimestamp: this.instanceStart,
crawlerFinishedAt: this.state.crawlerFinishedAt ? new Date(this.state.crawlerFinishedAt).toISOString() : null,
crawlerStartedAt: this.state.crawlerStartedAt ? new Date(this.state.crawlerStartedAt).toISOString() : null,
requestRetryHistogram: this.requestRetryHistogram,
statsId: this.id,
statsPersistedAt: new Date().toISOString(),
...this.calculate(),
};
Reflect.deleteProperty(result, 'requestsWithStatusCode');
Reflect.deleteProperty(result, 'errors');
Reflect.deleteProperty(result, 'retryErrors');
result.requestsWithStatusCode = this.state.requestsWithStatusCode;
result.errors = this.state.errors;
result.retryErrors = this.state.retryErrors;
return result;
}
}
interface StatisticsOptions {
logIntervalSecs?: number;
logMessage?: string;
keyValueStore?: KeyValueStore;
config?: Configuration;
}
/**
* Format of the persisted stats
*/
export interface StatisticPersistedState extends Omit<StatisticState, 'statsPersistedAt'> {
requestRetryHistogram: number[];
statsId: number;
requestAvgFailedDurationMillis: number;
requestAvgFinishedDurationMillis: number;
requestsFinishedPerMinute: number;
requestsFailedPerMinute: number;
requestTotalDurationMillis: number;
requestsTotal: number;
crawlerRuntimeMillis: number;
crawlerLastStartTimestamp: number;
statsPersistedAt: string;
}
/**
* Contains the statistics state
*/
export interface StatisticState {
requestsFinished: number;
requestsFailed: number;
requestsRetries: number;
requestsFailedPerMinute: number;
requestsFinishedPerMinute: number;
requestMinDurationMillis: number;
requestMaxDurationMillis: number;
requestTotalFailedDurationMillis: number;
requestTotalFinishedDurationMillis: number;
crawlerStartedAt: Date | string | null;
crawlerFinishedAt: Date | string | null;
crawlerRuntimeMillis: number;
statsPersistedAt: Date | string | null;
errors: Record<string, unknown>;
retryErrors: Record<string, unknown>;
requestsWithStatusCode: Record<string, number>;
}