kafka RequestHandlerHelper 源码

kafka RequestHandlerHelper 代码

文件路径：/core/src/main/scala/kafka/server/RequestHandlerHelper.scala

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

package kafka.server

import kafka.cluster.Partition
import kafka.coordinator.group.GroupCoordinator
import kafka.coordinator.transaction.TransactionCoordinator
import kafka.network.RequestChannel
import kafka.server.QuotaFactory.QuotaManagers
import org.apache.kafka.common.errors.ClusterAuthorizationException
import org.apache.kafka.common.internals.Topic
import org.apache.kafka.common.network.Send
import org.apache.kafka.common.requests.{AbstractRequest, AbstractResponse}
import org.apache.kafka.common.utils.Time

object RequestHandlerHelper {

  def onLeadershipChange(groupCoordinator: GroupCoordinator,
                         txnCoordinator: TransactionCoordinator,
                         updatedLeaders: Iterable[Partition],
                         updatedFollowers: Iterable[Partition]): Unit = {
    // for each new leader or follower, call coordinator to handle consumer group migration.
    // this callback is invoked under the replica state change lock to ensure proper order of
    // leadership changes
    updatedLeaders.foreach { partition =>
      if (partition.topic == Topic.GROUP_METADATA_TOPIC_NAME)
        groupCoordinator.onElection(partition.partitionId, partition.getLeaderEpoch)
      else if (partition.topic == Topic.TRANSACTION_STATE_TOPIC_NAME)
        txnCoordinator.onElection(partition.partitionId, partition.getLeaderEpoch)
    }

    updatedFollowers.foreach { partition =>
      if (partition.topic == Topic.GROUP_METADATA_TOPIC_NAME)
        groupCoordinator.onResignation(partition.partitionId, Some(partition.getLeaderEpoch))
      else if (partition.topic == Topic.TRANSACTION_STATE_TOPIC_NAME)
        txnCoordinator.onResignation(partition.partitionId, Some(partition.getLeaderEpoch))
    }
  }

}

class RequestHandlerHelper(
  requestChannel: RequestChannel,
  quotas: QuotaManagers,
  time: Time
) {

  def throttle(
    quotaManager: ClientQuotaManager,
    request: RequestChannel.Request,
    throttleTimeMs: Int
  ): Unit = {
    val callback = new ThrottleCallback {
      override def startThrottling(): Unit = requestChannel.startThrottling(request)
      override def endThrottling(): Unit = requestChannel.endThrottling(request)
    }
    quotaManager.throttle(request, callback, throttleTimeMs)
  }

  def handleError(request: RequestChannel.Request, e: Throwable): Unit = {
    val mayThrottle = e.isInstanceOf[ClusterAuthorizationException] || !request.header.apiKey.clusterAction
    if (mayThrottle)
      sendErrorResponseMaybeThrottle(request, e)
    else
      sendErrorResponseExemptThrottle(request, e)
  }

  def sendErrorOrCloseConnection(
    request: RequestChannel.Request,
    error: Throwable,
    throttleMs: Int
  ): Unit = {
    val requestBody = request.body[AbstractRequest]
    val response = requestBody.getErrorResponse(throttleMs, error)
    if (response == null)
      requestChannel.closeConnection(request, requestBody.errorCounts(error))
    else
      requestChannel.sendResponse(request, response, None)
  }

  def sendForwardedResponse(request: RequestChannel.Request,
                            response: AbstractResponse): Unit = {
    // For requests forwarded to the controller, we take the maximum of the local
    // request throttle and the throttle sent by the controller in the response.
    val controllerThrottleTimeMs = response.throttleTimeMs()
    val requestThrottleTimeMs = maybeRecordAndGetThrottleTimeMs(request)
    val appliedThrottleTimeMs = math.max(controllerThrottleTimeMs, requestThrottleTimeMs)
    throttle(quotas.request, request, appliedThrottleTimeMs)
    response.maybeSetThrottleTimeMs(appliedThrottleTimeMs)
    requestChannel.sendResponse(request, response, None)
  }

  // Throttle the channel if the request quota is enabled but has been violated. Regardless of throttling, send the
  // response immediately.
  def sendResponseMaybeThrottle(request: RequestChannel.Request,
                                createResponse: Int => AbstractResponse): Unit = {
    val throttleTimeMs = maybeRecordAndGetThrottleTimeMs(request)
    // Only throttle non-forwarded requests
    if (!request.isForwarded)
      throttle(quotas.request, request, throttleTimeMs)
    requestChannel.sendResponse(request, createResponse(throttleTimeMs), None)
  }

  def sendErrorResponseMaybeThrottle(request: RequestChannel.Request, error: Throwable): Unit = {
    val throttleTimeMs = maybeRecordAndGetThrottleTimeMs(request)
    // Only throttle non-forwarded requests or cluster authorization failures
    if (error.isInstanceOf[ClusterAuthorizationException] || !request.isForwarded)
      throttle(quotas.request, request, throttleTimeMs)
    sendErrorOrCloseConnection(request, error, throttleTimeMs)
  }

  def maybeRecordAndGetThrottleTimeMs(request: RequestChannel.Request): Int = {
    val throttleTimeMs = quotas.request.maybeRecordAndGetThrottleTimeMs(request, time.milliseconds())
    request.apiThrottleTimeMs = throttleTimeMs
    throttleTimeMs
  }

  /**
   * Throttle the channel if the controller mutations quota or the request quota have been violated.
   * Regardless of throttling, send the response immediately.
   */
  def sendResponseMaybeThrottleWithControllerQuota(controllerMutationQuota: ControllerMutationQuota,
                                                   request: RequestChannel.Request,
                                                   createResponse: Int => AbstractResponse): Unit = {
    val timeMs = time.milliseconds
    val controllerThrottleTimeMs = controllerMutationQuota.throttleTime
    val requestThrottleTimeMs = quotas.request.maybeRecordAndGetThrottleTimeMs(request, timeMs)
    val maxThrottleTimeMs = Math.max(controllerThrottleTimeMs, requestThrottleTimeMs)
    // Only throttle non-forwarded requests
    if (maxThrottleTimeMs > 0 && !request.isForwarded) {
      request.apiThrottleTimeMs = maxThrottleTimeMs
      if (controllerThrottleTimeMs > requestThrottleTimeMs) {
        throttle(quotas.controllerMutation, request, controllerThrottleTimeMs)
      } else {
        throttle(quotas.request, request, requestThrottleTimeMs)
      }
    }

    requestChannel.sendResponse(request, createResponse(maxThrottleTimeMs), None)
  }

  def sendResponseExemptThrottle(request: RequestChannel.Request,
                                 response: AbstractResponse,
                                 onComplete: Option[Send => Unit] = None): Unit = {
    quotas.request.maybeRecordExempt(request)
    requestChannel.sendResponse(request, response, onComplete)
  }

  def sendErrorResponseExemptThrottle(request: RequestChannel.Request, error: Throwable): Unit = {
    quotas.request.maybeRecordExempt(request)
    sendErrorOrCloseConnection(request, error, 0)
  }

  def sendNoOpResponseExemptThrottle(request: RequestChannel.Request): Unit = {
    quotas.request.maybeRecordExempt(request)
    requestChannel.sendNoOpResponse(request)
  }

}

相关信息

kafka 源码目录

相关文章

kafka AbstractFetcherManager 源码

kafka AbstractFetcherThread 源码

kafka AclApis 源码

kafka ActionQueue 源码

kafka AlterPartitionManager 源码

kafka ApiVersionManager 源码

kafka AuthHelper 源码

kafka AutoTopicCreationManager 源码

kafka BrokerBlockingSender 源码

kafka BrokerFeatures 源码