kafka-node/lib/consumerGroupRecovery.js

Client for Apache Kafka v0.8+

'use strict';

var retry = require('retry');
var debug = require('debug')('kafka-node:ConsumerGroupRecovery');
var assert = require('assert');

var GroupCoordinatorNotAvailable = require('./errors/GroupCoordinatorNotAvailableError');
var NotCoordinatorForGroup = require('./errors/NotCoordinatorForGroupError');
var IllegalGeneration = require('./errors/IllegalGenerationError');
var GroupLoadInProgress = require('./errors/GroupLoadInProgressError');
var UnknownMemberId = require('./errors/UnknownMemberIdError');
var RebalanceInProgress = require('./errors/RebalanceInProgressError');

var recoverableErrors = [
  {
    errors: [GroupCoordinatorNotAvailable, IllegalGeneration, GroupLoadInProgress, RebalanceInProgress]
  },
  {
    errors: [NotCoordinatorForGroup],
    handler: function () {
      this.client.coordinatorId = null;
    }
  },
  {
    errors: [UnknownMemberId],
    handler: function () {
      this.memberId = null;
    }
  }
];

function isErrorInstanceOf (error, errors) {
  return errors.some(function (errorClass) {
    return error instanceof errorClass;
  });
}

function ConsumerGroupRecovery (consumerGroup) {
  this.consumerGroup = consumerGroup;
  this.options = consumerGroup.options;
}

ConsumerGroupRecovery.prototype.tryToRecoverFrom = function (error, source) {
  this.consumerGroup.ready = false;
  this.consumerGroup.stopHeartbeats();

  var retryTimeout = false;
  var retry = recoverableErrors.some(function (recoverableItem) {
    if (isErrorInstanceOf(error, recoverableItem.errors)) {
      recoverableItem.handler && recoverableItem.handler.call(this.consumerGroup, error);
      return true;
    }
    return false;
  }, this);

  if (retry) {
    retryTimeout = this.getRetryTimeout(error);
  }

  if (retry && retryTimeout) {
    debug('RECOVERY from %s: %s retrying in %s ms', source, this.consumerGroup.client.clientId, retryTimeout, error);
    this.consumerGroup.scheduleReconnect(retryTimeout);
  } else {
    this.consumerGroup.emit('error', error);
  }
  this.lastError = error;
};

ConsumerGroupRecovery.prototype.clearError = function () {
  this.lastError = null;
};

ConsumerGroupRecovery.prototype.getRetryTimeout = function (error) {
  assert(error);
  if (!this._timeouts) {
    this._timeouts = retry.timeouts({
      retries: this.options.retries,
      factor: this.options.retryFactor,
      minTimeout: this.options.retryMinTimeout
    });
  }

  if (this._retryIndex == null || this.lastError == null ||
      error.errorCode !== this.lastError.errorCode) {
    this._retryIndex = 0;
  }

  var index = this._retryIndex++;
  if (index >= this._timeouts.length) {
    return false;
  }
  return this._timeouts[index];
};

module.exports = ConsumerGroupRecovery;