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716 lines
20 KiB
Go
716 lines
20 KiB
Go
package sarama
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import (
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"errors"
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"fmt"
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"sync"
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"sync/atomic"
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"time"
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)
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// ConsumerMessage encapsulates a Kafka message returned by the consumer.
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type ConsumerMessage struct {
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Key, Value []byte
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Topic string
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Partition int32
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Offset int64
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Timestamp time.Time // only set if kafka is version 0.10+
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}
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// ConsumerError is what is provided to the user when an error occurs.
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// It wraps an error and includes the topic and partition.
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type ConsumerError struct {
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Topic string
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Partition int32
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Err error
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}
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func (ce ConsumerError) Error() string {
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return fmt.Sprintf("kafka: error while consuming %s/%d: %s", ce.Topic, ce.Partition, ce.Err)
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}
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// ConsumerErrors is a type that wraps a batch of errors and implements the Error interface.
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// It can be returned from the PartitionConsumer's Close methods to avoid the need to manually drain errors
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// when stopping.
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type ConsumerErrors []*ConsumerError
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func (ce ConsumerErrors) Error() string {
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return fmt.Sprintf("kafka: %d errors while consuming", len(ce))
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}
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// Consumer manages PartitionConsumers which process Kafka messages from brokers. You MUST call Close()
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// on a consumer to avoid leaks, it will not be garbage-collected automatically when it passes out of
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// scope.
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//
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// Sarama's Consumer type does not currently support automatic consumer-group rebalancing and offset tracking.
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// For Zookeeper-based tracking (Kafka 0.8.2 and earlier), the https://github.com/wvanbergen/kafka library
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// builds on Sarama to add this support. For Kafka-based tracking (Kafka 0.9 and later), the
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// https://github.com/bsm/sarama-cluster library builds on Sarama to add this support.
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type Consumer interface {
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// Topics returns the set of available topics as retrieved from the cluster
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// metadata. This method is the same as Client.Topics(), and is provided for
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// convenience.
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Topics() ([]string, error)
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// Partitions returns the sorted list of all partition IDs for the given topic.
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// This method is the same as Client.Partitions(), and is provided for convenience.
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Partitions(topic string) ([]int32, error)
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// ConsumePartition creates a PartitionConsumer on the given topic/partition with
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// the given offset. It will return an error if this Consumer is already consuming
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// on the given topic/partition. Offset can be a literal offset, or OffsetNewest
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// or OffsetOldest
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ConsumePartition(topic string, partition int32, offset int64) (PartitionConsumer, error)
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// Close shuts down the consumer. It must be called after all child
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// PartitionConsumers have already been closed.
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Close() error
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}
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type consumer struct {
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client Client
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conf *Config
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ownClient bool
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lock sync.Mutex
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children map[string]map[int32]*partitionConsumer
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brokerConsumers map[*Broker]*brokerConsumer
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}
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// NewConsumer creates a new consumer using the given broker addresses and configuration.
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func NewConsumer(addrs []string, config *Config) (Consumer, error) {
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client, err := NewClient(addrs, config)
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if err != nil {
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return nil, err
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}
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c, err := NewConsumerFromClient(client)
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if err != nil {
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return nil, err
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}
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c.(*consumer).ownClient = true
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return c, nil
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}
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// NewConsumerFromClient creates a new consumer using the given client. It is still
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// necessary to call Close() on the underlying client when shutting down this consumer.
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func NewConsumerFromClient(client Client) (Consumer, error) {
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// Check that we are not dealing with a closed Client before processing any other arguments
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if client.Closed() {
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return nil, ErrClosedClient
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}
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c := &consumer{
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client: client,
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conf: client.Config(),
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children: make(map[string]map[int32]*partitionConsumer),
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brokerConsumers: make(map[*Broker]*brokerConsumer),
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}
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return c, nil
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}
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func (c *consumer) Close() error {
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if c.ownClient {
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return c.client.Close()
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}
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return nil
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}
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func (c *consumer) Topics() ([]string, error) {
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return c.client.Topics()
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}
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func (c *consumer) Partitions(topic string) ([]int32, error) {
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return c.client.Partitions(topic)
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}
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func (c *consumer) ConsumePartition(topic string, partition int32, offset int64) (PartitionConsumer, error) {
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child := &partitionConsumer{
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consumer: c,
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conf: c.conf,
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topic: topic,
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partition: partition,
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messages: make(chan *ConsumerMessage, c.conf.ChannelBufferSize),
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errors: make(chan *ConsumerError, c.conf.ChannelBufferSize),
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feeder: make(chan *FetchResponse, 1),
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trigger: make(chan none, 1),
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dying: make(chan none),
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fetchSize: c.conf.Consumer.Fetch.Default,
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}
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if err := child.chooseStartingOffset(offset); err != nil {
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return nil, err
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}
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var leader *Broker
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var err error
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if leader, err = c.client.Leader(child.topic, child.partition); err != nil {
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return nil, err
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}
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if err := c.addChild(child); err != nil {
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return nil, err
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}
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go withRecover(child.dispatcher)
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go withRecover(child.responseFeeder)
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child.broker = c.refBrokerConsumer(leader)
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child.broker.input <- child
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return child, nil
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}
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func (c *consumer) addChild(child *partitionConsumer) error {
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c.lock.Lock()
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defer c.lock.Unlock()
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topicChildren := c.children[child.topic]
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if topicChildren == nil {
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topicChildren = make(map[int32]*partitionConsumer)
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c.children[child.topic] = topicChildren
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}
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if topicChildren[child.partition] != nil {
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return ConfigurationError("That topic/partition is already being consumed")
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}
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topicChildren[child.partition] = child
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return nil
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}
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func (c *consumer) removeChild(child *partitionConsumer) {
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c.lock.Lock()
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defer c.lock.Unlock()
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delete(c.children[child.topic], child.partition)
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}
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func (c *consumer) refBrokerConsumer(broker *Broker) *brokerConsumer {
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c.lock.Lock()
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defer c.lock.Unlock()
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bc := c.brokerConsumers[broker]
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if bc == nil {
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bc = c.newBrokerConsumer(broker)
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c.brokerConsumers[broker] = bc
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}
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bc.refs++
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return bc
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}
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func (c *consumer) unrefBrokerConsumer(brokerWorker *brokerConsumer) {
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c.lock.Lock()
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defer c.lock.Unlock()
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brokerWorker.refs--
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if brokerWorker.refs == 0 {
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close(brokerWorker.input)
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if c.brokerConsumers[brokerWorker.broker] == brokerWorker {
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delete(c.brokerConsumers, brokerWorker.broker)
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}
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}
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}
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func (c *consumer) abandonBrokerConsumer(brokerWorker *brokerConsumer) {
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c.lock.Lock()
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defer c.lock.Unlock()
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delete(c.brokerConsumers, brokerWorker.broker)
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}
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// PartitionConsumer
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// PartitionConsumer processes Kafka messages from a given topic and partition. You MUST call Close()
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// or AsyncClose() on a PartitionConsumer to avoid leaks, it will not be garbage-collected automatically
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// when it passes out of scope.
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//
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// The simplest way of using a PartitionConsumer is to loop over its Messages channel using a for/range
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// loop. The PartitionConsumer will only stop itself in one case: when the offset being consumed is reported
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// as out of range by the brokers. In this case you should decide what you want to do (try a different offset,
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// notify a human, etc) and handle it appropriately. For all other error cases, it will just keep retrying.
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// By default, it logs these errors to sarama.Logger; if you want to be notified directly of all errors, set
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// your config's Consumer.Return.Errors to true and read from the Errors channel, using a select statement
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// or a separate goroutine. Check out the Consumer examples to see implementations of these different approaches.
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type PartitionConsumer interface {
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// AsyncClose initiates a shutdown of the PartitionConsumer. This method will
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// return immediately, after which you should wait until the 'messages' and
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// 'errors' channel are drained. It is required to call this function, or
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// Close before a consumer object passes out of scope, as it will otherwise
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// leak memory. You must call this before calling Close on the underlying client.
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AsyncClose()
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// Close stops the PartitionConsumer from fetching messages. It is required to
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// call this function (or AsyncClose) before a consumer object passes out of
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// scope, as it will otherwise leak memory. You must call this before calling
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// Close on the underlying client.
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Close() error
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// Messages returns the read channel for the messages that are returned by
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// the broker.
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Messages() <-chan *ConsumerMessage
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// Errors returns a read channel of errors that occurred during consuming, if
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// enabled. By default, errors are logged and not returned over this channel.
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// If you want to implement any custom error handling, set your config's
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// Consumer.Return.Errors setting to true, and read from this channel.
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Errors() <-chan *ConsumerError
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// HighWaterMarkOffset returns the high water mark offset of the partition,
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// i.e. the offset that will be used for the next message that will be produced.
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// You can use this to determine how far behind the processing is.
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HighWaterMarkOffset() int64
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}
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type partitionConsumer struct {
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consumer *consumer
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conf *Config
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topic string
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partition int32
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broker *brokerConsumer
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messages chan *ConsumerMessage
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errors chan *ConsumerError
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feeder chan *FetchResponse
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trigger, dying chan none
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responseResult error
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fetchSize int32
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offset int64
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highWaterMarkOffset int64
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}
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var errTimedOut = errors.New("timed out feeding messages to the user") // not user-facing
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func (child *partitionConsumer) sendError(err error) {
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cErr := &ConsumerError{
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Topic: child.topic,
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Partition: child.partition,
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Err: err,
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}
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if child.conf.Consumer.Return.Errors {
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child.errors <- cErr
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} else {
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Logger.Println(cErr)
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}
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}
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func (child *partitionConsumer) dispatcher() {
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for _ = range child.trigger {
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select {
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case <-child.dying:
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close(child.trigger)
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case <-time.After(child.conf.Consumer.Retry.Backoff):
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if child.broker != nil {
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child.consumer.unrefBrokerConsumer(child.broker)
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child.broker = nil
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}
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Logger.Printf("consumer/%s/%d finding new broker\n", child.topic, child.partition)
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if err := child.dispatch(); err != nil {
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child.sendError(err)
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child.trigger <- none{}
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}
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}
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}
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if child.broker != nil {
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child.consumer.unrefBrokerConsumer(child.broker)
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}
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child.consumer.removeChild(child)
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close(child.feeder)
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}
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func (child *partitionConsumer) dispatch() error {
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if err := child.consumer.client.RefreshMetadata(child.topic); err != nil {
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return err
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}
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var leader *Broker
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var err error
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if leader, err = child.consumer.client.Leader(child.topic, child.partition); err != nil {
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return err
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}
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child.broker = child.consumer.refBrokerConsumer(leader)
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child.broker.input <- child
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return nil
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}
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func (child *partitionConsumer) chooseStartingOffset(offset int64) error {
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newestOffset, err := child.consumer.client.GetOffset(child.topic, child.partition, OffsetNewest)
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if err != nil {
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return err
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}
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oldestOffset, err := child.consumer.client.GetOffset(child.topic, child.partition, OffsetOldest)
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if err != nil {
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return err
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}
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switch {
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case offset == OffsetNewest:
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child.offset = newestOffset
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case offset == OffsetOldest:
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child.offset = oldestOffset
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case offset >= oldestOffset && offset <= newestOffset:
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child.offset = offset
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default:
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return ErrOffsetOutOfRange
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}
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return nil
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}
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func (child *partitionConsumer) Messages() <-chan *ConsumerMessage {
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return child.messages
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}
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func (child *partitionConsumer) Errors() <-chan *ConsumerError {
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return child.errors
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}
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func (child *partitionConsumer) AsyncClose() {
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// this triggers whatever broker owns this child to abandon it and close its trigger channel, which causes
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// the dispatcher to exit its loop, which removes it from the consumer then closes its 'messages' and
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// 'errors' channel (alternatively, if the child is already at the dispatcher for some reason, that will
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// also just close itself)
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close(child.dying)
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}
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func (child *partitionConsumer) Close() error {
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child.AsyncClose()
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go withRecover(func() {
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for _ = range child.messages {
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// drain
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}
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})
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var errors ConsumerErrors
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for err := range child.errors {
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errors = append(errors, err)
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}
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if len(errors) > 0 {
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return errors
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}
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return nil
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}
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func (child *partitionConsumer) HighWaterMarkOffset() int64 {
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return atomic.LoadInt64(&child.highWaterMarkOffset)
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}
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func (child *partitionConsumer) responseFeeder() {
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var msgs []*ConsumerMessage
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expiryTimer := time.NewTimer(child.conf.Consumer.MaxProcessingTime)
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expireTimedOut := false
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feederLoop:
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for response := range child.feeder {
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msgs, child.responseResult = child.parseResponse(response)
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for i, msg := range msgs {
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if !expiryTimer.Stop() && !expireTimedOut {
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// expiryTimer was expired; clear out the waiting msg
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<-expiryTimer.C
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}
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expiryTimer.Reset(child.conf.Consumer.MaxProcessingTime)
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expireTimedOut = false
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select {
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case child.messages <- msg:
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case <-expiryTimer.C:
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expireTimedOut = true
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child.responseResult = errTimedOut
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child.broker.acks.Done()
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for _, msg = range msgs[i:] {
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child.messages <- msg
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}
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child.broker.input <- child
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continue feederLoop
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}
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}
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child.broker.acks.Done()
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}
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close(child.messages)
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close(child.errors)
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}
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func (child *partitionConsumer) parseResponse(response *FetchResponse) ([]*ConsumerMessage, error) {
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block := response.GetBlock(child.topic, child.partition)
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if block == nil {
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return nil, ErrIncompleteResponse
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}
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if block.Err != ErrNoError {
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return nil, block.Err
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}
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if len(block.MsgSet.Messages) == 0 {
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// We got no messages. If we got a trailing one then we need to ask for more data.
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// Otherwise we just poll again and wait for one to be produced...
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if block.MsgSet.PartialTrailingMessage {
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if child.conf.Consumer.Fetch.Max > 0 && child.fetchSize == child.conf.Consumer.Fetch.Max {
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// we can't ask for more data, we've hit the configured limit
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child.sendError(ErrMessageTooLarge)
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child.offset++ // skip this one so we can keep processing future messages
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} else {
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child.fetchSize *= 2
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if child.conf.Consumer.Fetch.Max > 0 && child.fetchSize > child.conf.Consumer.Fetch.Max {
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child.fetchSize = child.conf.Consumer.Fetch.Max
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}
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}
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}
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return nil, nil
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}
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// we got messages, reset our fetch size in case it was increased for a previous request
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child.fetchSize = child.conf.Consumer.Fetch.Default
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atomic.StoreInt64(&child.highWaterMarkOffset, block.HighWaterMarkOffset)
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incomplete := false
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prelude := true
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var messages []*ConsumerMessage
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for _, msgBlock := range block.MsgSet.Messages {
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for _, msg := range msgBlock.Messages() {
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offset := msg.Offset
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if msg.Msg.Version >= 1 {
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baseOffset := msgBlock.Offset - msgBlock.Messages()[len(msgBlock.Messages())-1].Offset
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offset += baseOffset
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}
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if prelude && offset < child.offset {
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continue
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}
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prelude = false
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if offset >= child.offset {
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messages = append(messages, &ConsumerMessage{
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Topic: child.topic,
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Partition: child.partition,
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Key: msg.Msg.Key,
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Value: msg.Msg.Value,
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Offset: offset,
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Timestamp: msg.Msg.Timestamp,
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})
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child.offset = offset + 1
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} else {
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incomplete = true
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}
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}
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}
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if incomplete || len(messages) == 0 {
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return nil, ErrIncompleteResponse
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}
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return messages, nil
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}
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// brokerConsumer
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type brokerConsumer struct {
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consumer *consumer
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broker *Broker
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input chan *partitionConsumer
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newSubscriptions chan []*partitionConsumer
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wait chan none
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subscriptions map[*partitionConsumer]none
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acks sync.WaitGroup
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refs int
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}
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func (c *consumer) newBrokerConsumer(broker *Broker) *brokerConsumer {
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bc := &brokerConsumer{
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consumer: c,
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broker: broker,
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input: make(chan *partitionConsumer),
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newSubscriptions: make(chan []*partitionConsumer),
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wait: make(chan none),
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subscriptions: make(map[*partitionConsumer]none),
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refs: 0,
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}
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go withRecover(bc.subscriptionManager)
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go withRecover(bc.subscriptionConsumer)
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return bc
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}
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func (bc *brokerConsumer) subscriptionManager() {
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var buffer []*partitionConsumer
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// The subscriptionManager constantly accepts new subscriptions on `input` (even when the main subscriptionConsumer
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// goroutine is in the middle of a network request) and batches it up. The main worker goroutine picks
|
|
// up a batch of new subscriptions between every network request by reading from `newSubscriptions`, so we give
|
|
// it nil if no new subscriptions are available. We also write to `wait` only when new subscriptions is available,
|
|
// so the main goroutine can block waiting for work if it has none.
|
|
for {
|
|
if len(buffer) > 0 {
|
|
select {
|
|
case event, ok := <-bc.input:
|
|
if !ok {
|
|
goto done
|
|
}
|
|
buffer = append(buffer, event)
|
|
case bc.newSubscriptions <- buffer:
|
|
buffer = nil
|
|
case bc.wait <- none{}:
|
|
}
|
|
} else {
|
|
select {
|
|
case event, ok := <-bc.input:
|
|
if !ok {
|
|
goto done
|
|
}
|
|
buffer = append(buffer, event)
|
|
case bc.newSubscriptions <- nil:
|
|
}
|
|
}
|
|
}
|
|
|
|
done:
|
|
close(bc.wait)
|
|
if len(buffer) > 0 {
|
|
bc.newSubscriptions <- buffer
|
|
}
|
|
close(bc.newSubscriptions)
|
|
}
|
|
|
|
func (bc *brokerConsumer) subscriptionConsumer() {
|
|
<-bc.wait // wait for our first piece of work
|
|
|
|
// the subscriptionConsumer ensures we will get nil right away if no new subscriptions is available
|
|
for newSubscriptions := range bc.newSubscriptions {
|
|
bc.updateSubscriptions(newSubscriptions)
|
|
|
|
if len(bc.subscriptions) == 0 {
|
|
// We're about to be shut down or we're about to receive more subscriptions.
|
|
// Either way, the signal just hasn't propagated to our goroutine yet.
|
|
<-bc.wait
|
|
continue
|
|
}
|
|
|
|
response, err := bc.fetchNewMessages()
|
|
|
|
if err != nil {
|
|
Logger.Printf("consumer/broker/%d disconnecting due to error processing FetchRequest: %s\n", bc.broker.ID(), err)
|
|
bc.abort(err)
|
|
return
|
|
}
|
|
|
|
bc.acks.Add(len(bc.subscriptions))
|
|
for child := range bc.subscriptions {
|
|
child.feeder <- response
|
|
}
|
|
bc.acks.Wait()
|
|
bc.handleResponses()
|
|
}
|
|
}
|
|
|
|
func (bc *brokerConsumer) updateSubscriptions(newSubscriptions []*partitionConsumer) {
|
|
for _, child := range newSubscriptions {
|
|
bc.subscriptions[child] = none{}
|
|
Logger.Printf("consumer/broker/%d added subscription to %s/%d\n", bc.broker.ID(), child.topic, child.partition)
|
|
}
|
|
|
|
for child := range bc.subscriptions {
|
|
select {
|
|
case <-child.dying:
|
|
Logger.Printf("consumer/broker/%d closed dead subscription to %s/%d\n", bc.broker.ID(), child.topic, child.partition)
|
|
close(child.trigger)
|
|
delete(bc.subscriptions, child)
|
|
default:
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
func (bc *brokerConsumer) handleResponses() {
|
|
// handles the response codes left for us by our subscriptions, and abandons ones that have been closed
|
|
for child := range bc.subscriptions {
|
|
result := child.responseResult
|
|
child.responseResult = nil
|
|
|
|
switch result {
|
|
case nil:
|
|
break
|
|
case errTimedOut:
|
|
Logger.Printf("consumer/broker/%d abandoned subscription to %s/%d because consuming was taking too long\n",
|
|
bc.broker.ID(), child.topic, child.partition)
|
|
delete(bc.subscriptions, child)
|
|
case ErrOffsetOutOfRange:
|
|
// there's no point in retrying this it will just fail the same way again
|
|
// shut it down and force the user to choose what to do
|
|
child.sendError(result)
|
|
Logger.Printf("consumer/%s/%d shutting down because %s\n", child.topic, child.partition, result)
|
|
close(child.trigger)
|
|
delete(bc.subscriptions, child)
|
|
case ErrUnknownTopicOrPartition, ErrNotLeaderForPartition, ErrLeaderNotAvailable, ErrReplicaNotAvailable:
|
|
// not an error, but does need redispatching
|
|
Logger.Printf("consumer/broker/%d abandoned subscription to %s/%d because %s\n",
|
|
bc.broker.ID(), child.topic, child.partition, result)
|
|
child.trigger <- none{}
|
|
delete(bc.subscriptions, child)
|
|
default:
|
|
// dunno, tell the user and try redispatching
|
|
child.sendError(result)
|
|
Logger.Printf("consumer/broker/%d abandoned subscription to %s/%d because %s\n",
|
|
bc.broker.ID(), child.topic, child.partition, result)
|
|
child.trigger <- none{}
|
|
delete(bc.subscriptions, child)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (bc *brokerConsumer) abort(err error) {
|
|
bc.consumer.abandonBrokerConsumer(bc)
|
|
_ = bc.broker.Close() // we don't care about the error this might return, we already have one
|
|
|
|
for child := range bc.subscriptions {
|
|
child.sendError(err)
|
|
child.trigger <- none{}
|
|
}
|
|
|
|
for newSubscriptions := range bc.newSubscriptions {
|
|
if len(newSubscriptions) == 0 {
|
|
<-bc.wait
|
|
continue
|
|
}
|
|
for _, child := range newSubscriptions {
|
|
child.sendError(err)
|
|
child.trigger <- none{}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (bc *brokerConsumer) fetchNewMessages() (*FetchResponse, error) {
|
|
request := &FetchRequest{
|
|
MinBytes: bc.consumer.conf.Consumer.Fetch.Min,
|
|
MaxWaitTime: int32(bc.consumer.conf.Consumer.MaxWaitTime / time.Millisecond),
|
|
}
|
|
if bc.consumer.conf.Version.IsAtLeast(V0_10_0_0) {
|
|
request.Version = 2
|
|
}
|
|
|
|
for child := range bc.subscriptions {
|
|
request.AddBlock(child.topic, child.partition, child.offset, child.fetchSize)
|
|
}
|
|
|
|
return bc.broker.Fetch(request)
|
|
}
|