kafka

package
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 Go to latest Published: Feb 7, 2019 License: Apache-2.0 Imports: 12 Imported by: 3

README

Information for confluent-kafka-go developers

Whenever librdkafka error codes are updated make sure to run generate before building:

  $ make -f mk/Makefile generr
  $ go build ./...

Testing

Some of the tests included in this directory, the benchmark and integration tests in particular, require an existing Kafka cluster and a testconf.json configuration file to provide tests with bootstrap brokers, topic name, etc.

The format of testconf.json is a JSON object:

{
  "Brokers": "<bootstrap-brokers>",
  "Topic": "<test-topic-name>"
}

See testconf-example.json for an example and full set of available options.

To run unit-tests:

$ go test

To run benchmark tests:

$ go test -bench .

For the code coverage:

$ go test -coverprofile=coverage.out -bench=.
$ go tool cover -func=coverage.out

Build tags (static linking)

Different build types are supported through Go build tags (-tags ..), these tags should be specified on the application build command.

  • static - Build with librdkafka linked statically (but librdkafka dependencies linked dynamically).
  • static_all - Build with all libraries linked statically.
  • neither - Build with librdkafka (and its dependencies) linked dynamically.

Generating HTML documentation

To generate one-page HTML documentation run the mk/doc-gen.py script from the top-level directory. This script requires the beautifulsoup4 Python package.

$ source .../your/virtualenv/bin/activate
$ pip install beautifulsoup4
...
$ make -f mk/Makefile docs

Release process

For each release candidate and final release, perform the following steps:

Install librdkafka

Make sure the librdkafka version installed is the version this release is aimed to be used with.

E.g., confluent-kafka-go v1.0.0 will require librdkafka v1.0.0.

Update librdkafka version requirement

Update the minimum required librdkafka version in kafka/00version.go and README.md.

Update error codes

Error codes can be automatically generated from the current librdkafka version.

Update generated error codes:

$ make -f mk/Makefile generr
# Verify by building
Rebuild everything
$ go clean -i ./...
$ go build ./...
Run full test suite

Set up a test cluster using whatever mechanism you typically use (docker, trivup, ccloud, ..).

Make sure to update kafka/testconf.json as needed (broker list, $BROKERS)

Run test suite:

$ go test ./...
Verify examples

Manually verify that the examples/ applications work.

Also make sure the examples in README.md work.

Commit any changes

Make sure to push to github before creating the tag to have CI tests pass.

Create and push tag
$ git tag v1.0.0-RC3
$ git push --dry-run origin v1.0.0-RC3
# Remove --dry-run and re-execute if it looks ok.
Create release notes page on github

Documentation

Overview

Package kafka provides high-level Apache Kafka producer and consumers using bindings on-top of the librdkafka C library.

High-level Consumer

* Decide if you want to read messages and events from the `.Events()` channel (set `"go.events.channel.enable": true`) or by calling `.Poll()`.

* Create a Consumer with `kafka.NewConsumer()` providing at least the `bootstrap.servers` and `group.id` configuration properties.

* Call `.Subscribe()` or (`.SubscribeTopics()` to subscribe to multiple topics) to join the group with the specified subscription set. Subscriptions are atomic, calling `.Subscribe*()` again will leave the group and rejoin with the new set of topics.

* Start reading events and messages from either the `.Events` channel or by calling `.Poll()`.

* When the group has rebalanced each client member is assigned a (sub-)set of topic+partitions. By default the consumer will start fetching messages for its assigned partitions at this point, but your application may enable rebalance events to get an insight into what the assigned partitions where as well as set the initial offsets. To do this you need to pass `"go.application.rebalance.enable": true` to the `NewConsumer()` call mentioned above. You will (eventually) see a `kafka.AssignedPartitions` event with the assigned partition set. You can optionally modify the initial offsets (they'll default to stored offsets and if there are no previously stored offsets it will fall back to `"auto.offset.reset"` which defaults to the `latest` message) and then call `.Assign(partitions)` to start consuming. If you don't need to modify the initial offsets you will not need to call `.Assign()`, the client will do so automatically for you if you dont.

* As messages are fetched they will be made available on either the `.Events` channel or by calling `.Poll()`, look for event type `*kafka.Message`.

* Handle messages, events and errors to your liking.

* When you are done consuming call `.Close()` to commit final offsets and leave the consumer group.

Producer

* Create a Producer with `kafka.NewProducer()` providing at least the `bootstrap.servers` configuration properties.

* Messages may now be produced either by sending a `*kafka.Message` on the `.ProduceChannel` or by calling `.Produce()`.

* Producing is an asynchronous operation so the client notifies the application of per-message produce success or failure through something called delivery reports. Delivery reports are by default emitted on the `.Events()` channel as `*kafka.Message` and you should check `msg.TopicPartition.Error` for `nil` to find out if the message was succesfully delivered or not. It is also possible to direct delivery reports to alternate channels by providing a non-nil `chan Event` channel to `.Produce()`. If no delivery reports are wanted they can be completely disabled by setting configuration property `"go.delivery.reports": false`.

* When you are done producing messages you will need to make sure all messages are indeed delivered to the broker (or failed), remember that this is an asynchronous client so some of your messages may be lingering in internal channels or tranmission queues. To do this you can either keep track of the messages you've produced and wait for their corresponding delivery reports, or call the convenience function `.Flush()` that will block until all message deliveries are done or the provided timeout elapses.

* Finally call `.Close()` to decommission the producer.

Events

Apart from emitting messages and delivery reports the client also communicates with the application through a number of different event types. An application may choose to handle or ignore these events.

Consumer events

* `*kafka.Message` - a fetched message.

* `AssignedPartitions` - The assigned partition set for this client following a rebalance. Requires `go.application.rebalance.enable`

* `RevokedPartitions` - The counter part to `AssignedPartitions` following a rebalance. `AssignedPartitions` and `RevokedPartitions` are symetrical. Requires `go.application.rebalance.enable`

* `PartitionEOF` - Consumer has reached the end of a partition. NOTE: The consumer will keep trying to fetch new messages for the partition.

* `OffsetsCommitted` - Offset commit results (when `enable.auto.commit` is enabled).

Producer events

* `*kafka.Message` - delivery report for produced message. Check `.TopicPartition.Error` for delivery result.

Generic events for both Consumer and Producer

* `KafkaError` - client (error codes are prefixed with _) or broker error. These errors are normally just informational since the client will try its best to automatically recover (eventually).

Hint: If your application registers a signal notification (signal.Notify) makes sure the signals channel is buffered to avoid possible complications with blocking Poll() calls.

Note: The Confluent Kafka Go client is safe for concurrent use.

Index

Constants

View Source 
const (
	// ResourceUnknown - Unknown
	ResourceUnknown = ResourceType(C.RD_KAFKA_RESOURCE_UNKNOWN)
	// ResourceAny - match any resource type (DescribeConfigs)
	ResourceAny = ResourceType(C.RD_KAFKA_RESOURCE_ANY)
	// ResourceTopic - Topic
	ResourceTopic = ResourceType(C.RD_KAFKA_RESOURCE_TOPIC)
	// ResourceGroup - Group
	ResourceGroup = ResourceType(C.RD_KAFKA_RESOURCE_GROUP)
	// ResourceBroker - Broker
	ResourceBroker = ResourceType(C.RD_KAFKA_RESOURCE_BROKER)
)
View Source 
const (
	// ConfigSourceUnknown is the default value
	ConfigSourceUnknown = ConfigSource(C.RD_KAFKA_CONFIG_SOURCE_UNKNOWN_CONFIG)
	// ConfigSourceDynamicTopic is dynamic topic config that is configured for a specific topic
	ConfigSourceDynamicTopic = ConfigSource(C.RD_KAFKA_CONFIG_SOURCE_DYNAMIC_TOPIC_CONFIG)
	// ConfigSourceDynamicBroker is dynamic broker config that is configured for a specific broker
	ConfigSourceDynamicBroker = ConfigSource(C.RD_KAFKA_CONFIG_SOURCE_DYNAMIC_BROKER_CONFIG)
	// ConfigSourceDynamicDefaultBroker is dynamic broker config that is configured as default for all brokers in the cluster
	ConfigSourceDynamicDefaultBroker = ConfigSource(C.RD_KAFKA_CONFIG_SOURCE_DYNAMIC_DEFAULT_BROKER_CONFIG)
	// ConfigSourceStaticBroker is static broker config provided as broker properties at startup (e.g. from server.properties file)
	ConfigSourceStaticBroker = ConfigSource(C.RD_KAFKA_CONFIG_SOURCE_STATIC_BROKER_CONFIG)
	// ConfigSourceDefault is built-in default configuration for configs that have a default value
	ConfigSourceDefault = ConfigSource(C.RD_KAFKA_CONFIG_SOURCE_DEFAULT_CONFIG)
)
View Source 
const (
	// TimestampNotAvailable indicates no timestamp was set, or not available due to lacking broker support
	TimestampNotAvailable = TimestampType(C.RD_KAFKA_TIMESTAMP_NOT_AVAILABLE)
	// TimestampCreateTime indicates timestamp set by producer (source time)
	TimestampCreateTime = TimestampType(C.RD_KAFKA_TIMESTAMP_CREATE_TIME)
	// TimestampLogAppendTime indicates timestamp set set by broker (store time)
	TimestampLogAppendTime = TimestampType(C.RD_KAFKA_TIMESTAMP_LOG_APPEND_TIME)
)
View Source 
const (
	// AlterOperationSet sets/overwrites the configuration setting.
	AlterOperationSet = iota
)
View Source 
const OffsetBeginning = Offset(C.RD_KAFKA_OFFSET_BEGINNING)

OffsetBeginning represents the earliest offset (logical)

View Source 
const OffsetEnd = Offset(C.RD_KAFKA_OFFSET_END)

OffsetEnd represents the latest offset (logical)

View Source 
const OffsetInvalid = Offset(C.RD_KAFKA_OFFSET_INVALID)

OffsetInvalid represents an invalid/unspecified offset

View Source 
const OffsetStored = Offset(C.RD_KAFKA_OFFSET_STORED)

OffsetStored represents a stored offset

View Source 
const PartitionAny = int32(C.RD_KAFKA_PARTITION_UA)

PartitionAny represents any partition (for partitioning), or unspecified value (for all other cases)

Variables

This section is empty.

Functions

func LibraryVersion 

func LibraryVersion() (int, string)

LibraryVersion returns the underlying librdkafka library version as a (version_int, version_str) tuple.

Types

type AdminClient 

type AdminClient struct {
	// contains filtered or unexported fields
}

AdminClient is derived from an existing Producer or Consumer

func NewAdminClient 

func NewAdminClient(conf *ConfigMap) (*AdminClient, error)

NewAdminClient creats a new AdminClient instance with a new underlying client instance

func NewAdminClientFromConsumer 

func NewAdminClientFromConsumer(c *Consumer) (a *AdminClient, err error)

NewAdminClientFromConsumer derives a new AdminClient from an existing Consumer instance. The AdminClient will use the same configuration and connections as the parent instance.

func NewAdminClientFromProducer 

func NewAdminClientFromProducer(p *Producer) (a *AdminClient, err error)

NewAdminClientFromProducer derives a new AdminClient from an existing Producer instance. The AdminClient will use the same configuration and connections as the parent instance.

func (*AdminClient) AlterConfigs 

func (a *AdminClient) AlterConfigs(ctx context.Context, resources []ConfigResource, options ...AlterConfigsAdminOption) (result []ConfigResourceResult, err error)

AlterConfigs alters/updates cluster resource configuration.

Updates are not transactional so they may succeed for a subset of the provided resources while others fail. The configuration for a particular resource is updated atomically, replacing values using the provided ConfigEntrys and reverting unspecified ConfigEntrys to their default values.

Requires broker version >=0.11.0.0

AlterConfigs will replace all existing configuration for the provided resources with the new configuration given, reverting all other configuration to their default values.

Multiple resources and resource types may be set, but at most one resource of type ResourceBroker is allowed per call since these resource requests must be sent to the broker specified in the resource.

func (*AdminClient) Close 

func (a *AdminClient) Close()

Close an AdminClient instance.

func (*AdminClient) CreatePartitions 

func (a *AdminClient) CreatePartitions(ctx context.Context, partitions []PartitionsSpecification, options ...CreatePartitionsAdminOption) (result []TopicResult, err error)

CreatePartitions creates additional partitions for topics.

func (*AdminClient) CreateTopics 

func (a *AdminClient) CreateTopics(ctx context.Context, topics []TopicSpecification, options ...CreateTopicsAdminOption) (result []TopicResult, err error)

CreateTopics creates topics in cluster.

The list of TopicSpecification objects define the per-topic partition count, replicas, etc.

Topic creation is non-atomic and may succeed for some topics but fail for others, make sure to check the result for topic-specific errors.

Note: TopicSpecification is analogous to NewTopic in the Java Topic Admin API.

func (*AdminClient) DeleteTopics 

func (a *AdminClient) DeleteTopics(ctx context.Context, topics []string, options ...DeleteTopicsAdminOption) (result []TopicResult, err error)

DeleteTopics deletes a batch of topics.

This operation is not transactional and may succeed for a subset of topics while failing others. It may take several seconds after the DeleteTopics result returns success for all the brokers to become aware that the topics are gone. During this time, topic metadata and configuration may continue to return information about deleted topics.

Requires broker version >= 0.10.1.0

func (*AdminClient) DescribeConfigs 

func (a *AdminClient) DescribeConfigs(ctx context.Context, resources []ConfigResource, options ...DescribeConfigsAdminOption) (result []ConfigResourceResult, err error)

DescribeConfigs retrieves configuration for cluster resources.

The returned configuration includes default values, use ConfigEntryResult.IsDefault or ConfigEntryResult.Source to distinguish default values from manually configured settings.

The value of config entries where .IsSensitive is true will always be nil to avoid disclosing sensitive information, such as security settings.

Configuration entries where .IsReadOnly is true can't be modified (with AlterConfigs).

Synonym configuration entries are returned if the broker supports it (broker version >= 1.1.0). See .Synonyms.

Requires broker version >=0.11.0.0

Multiple resources and resource types may be requested, but at most one resource of type ResourceBroker is allowed per call since these resource requests must be sent to the broker specified in the resource.

func (*AdminClient) GetMetadata 

func (a *AdminClient) GetMetadata(topic *string, allTopics bool, timeoutMs int) (*Metadata, error)

GetMetadata queries broker for cluster and topic metadata. If topic is non-nil only information about that topic is returned, else if allTopics is false only information about locally used topics is returned, else information about all topics is returned. GetMetadata is equivalent to listTopics, describeTopics and describeCluster in the Java API.

func (*AdminClient) String 

func (a *AdminClient) String() string

String returns a human readable name for an AdminClient instance

type AdminOption 

type AdminOption interface {
	// contains filtered or unexported methods
}

AdminOption is a generic type not to be used directly.

See CreateTopicsAdminOption et.al.

type AdminOptionOperationTimeout 

type AdminOptionOperationTimeout struct {
	// contains filtered or unexported fields
}

AdminOptionOperationTimeout sets the broker's operation timeout, such as the timeout for CreateTopics to complete the creation of topics on the controller before returning a result to the application.

CreateTopics, DeleteTopics, CreatePartitions: a value 0 will return immediately after triggering topic creation, while > 0 will wait this long for topic creation to propagate in cluster.

Default: 0 (return immediately).

Valid for CreateTopics, DeleteTopics, CreatePartitions.

func SetAdminOperationTimeout 

func SetAdminOperationTimeout(t time.Duration) (ao AdminOptionOperationTimeout)

SetAdminOperationTimeout sets the broker's operation timeout, such as the timeout for CreateTopics to complete the creation of topics on the controller before returning a result to the application.

CreateTopics, DeleteTopics, CreatePartitions: a value 0 will return immediately after triggering topic creation, while > 0 will wait this long for topic creation to propagate in cluster.

Default: 0 (return immediately).

Valid for CreateTopics, DeleteTopics, CreatePartitions.

type AdminOptionRequestTimeout 

type AdminOptionRequestTimeout struct {
	// contains filtered or unexported fields
}

AdminOptionRequestTimeout sets the overall request timeout, including broker lookup, request transmission, operation time on broker, and response.

Default: `socket.timeout.ms`.

Valid for all Admin API methods.

func SetAdminRequestTimeout 

func SetAdminRequestTimeout(t time.Duration) (ao AdminOptionRequestTimeout)

SetAdminRequestTimeout sets the overall request timeout, including broker lookup, request transmission, operation time on broker, and response.

Default: `socket.timeout.ms`.

Valid for all Admin API methods.

type AdminOptionValidateOnly 

type AdminOptionValidateOnly struct {
	// contains filtered or unexported fields
}

AdminOptionValidateOnly tells the broker to only validate the request, without performing the requested operation (create topics, etc).

Default: false.

Valid for CreateTopics, CreatePartitions, AlterConfigs

func SetAdminValidateOnly 

func SetAdminValidateOnly(validateOnly bool) (ao AdminOptionValidateOnly)

SetAdminValidateOnly tells the broker to only validate the request, without performing the requested operation (create topics, etc).

Default: false.

Valid for CreateTopics, DeleteTopics, CreatePartitions, AlterConfigs

type AlterConfigsAdminOption 

type AlterConfigsAdminOption interface {
	// contains filtered or unexported methods
}

AlterConfigsAdminOption - see setters.

See SetAdminRequestTimeout, SetAdminValidateOnly, SetAdminIncremental.

type AlterOperation 

type AlterOperation int

AlterOperation specifies the operation to perform on the ConfigEntry. Currently only AlterOperationSet.

func (AlterOperation) String 

func (o AlterOperation) String() string

String returns the human-readable representation of an AlterOperation

type AssignedPartitions 

type AssignedPartitions struct {
	Partitions []TopicPartition
}

AssignedPartitions consumer group rebalance event: assigned partition set

func (AssignedPartitions) String 

func (e AssignedPartitions) String() string

type BrokerMetadata 

type BrokerMetadata struct {
	ID   int32
	Host string
	Port int
}

BrokerMetadata contains per-broker metadata

type ConfigEntry 

type ConfigEntry struct {
	// Name of configuration entry, e.g., topic configuration property name.
	Name string
	// Value of configuration entry.
	Value string
	// Operation to perform on the entry.
	Operation AlterOperation
}

ConfigEntry holds parameters for altering a resource's configuration.

func StringMapToConfigEntries 

func StringMapToConfigEntries(stringMap map[string]string, operation AlterOperation) []ConfigEntry

StringMapToConfigEntries creates a new map of ConfigEntry objects from the provided string map. The AlterOperation is set on each created entry.

func (ConfigEntry) String 

func (c ConfigEntry) String() string

String returns a human-readable representation of a ConfigEntry.

type ConfigEntryResult 

type ConfigEntryResult struct {
	// Name of configuration entry, e.g., topic configuration property name.
	Name string
	// Value of configuration entry.
	Value string
	// Source indicates the configuration source.
	Source ConfigSource
	// IsReadOnly indicates whether the configuration entry can be altered.
	IsReadOnly bool
	// IsSensitive indicates whether the configuration entry contains sensitive information, in which case the value will be unset.
	IsSensitive bool
	// IsSynonym indicates whether the configuration entry is a synonym for another configuration property.
	IsSynonym bool
	// Synonyms contains a map of configuration entries that are synonyms to this configuration entry.
	Synonyms map[string]ConfigEntryResult
}

ConfigEntryResult contains the result of a single configuration entry from a DescribeConfigs request.

func (ConfigEntryResult) String 

func (c ConfigEntryResult) String() string

String returns a human-readable representation of a ConfigEntryResult.

type ConfigMap 

type ConfigMap map[string]ConfigValue

ConfigMap is a map contaning standard librdkafka configuration properties as documented in: https://github.com/edenhill/librdkafka/tree/master/CONFIGURATION.md

The special property "default.topic.config" (optional) is a ConfigMap containing default topic configuration properties.

The use of "default.topic.config" is deprecated, topic configuration properties shall be specified in the standard ConfigMap. For backwards compatibility, "default.topic.config" (if supplied) takes precedence.

func (ConfigMap) Get 

func (m ConfigMap) Get(key string, defval ConfigValue) (ConfigValue, error)

Get finds the given key in the ConfigMap and returns its value. If the key is not found `defval` is returned. If the key is found but the type does not match that of `defval` (unless nil) an ErrInvalidArg error is returned.

func (ConfigMap) Set 

func (m ConfigMap) Set(kv string) error

Set implements flag.Set (command line argument parser) as a convenience for `-X key=value` config.

func (ConfigMap) SetKey 

func (m ConfigMap) SetKey(key string, value ConfigValue) error

SetKey sets configuration property key to value.

For user convenience a key prefixed with {topic}. will be set on the "default.topic.config" sub-map, this use is deprecated.

type ConfigResource 

type ConfigResource struct {
	// Type of resource to set.
	Type ResourceType
	// Name of resource to set.
	Name string
	// Config entries to set.
	// Configuration updates are atomic, any configuration property not provided
	// here will be reverted (by the broker) to its default value.
	// Use DescribeConfigs to retrieve the list of current configuration entry values.
	Config []ConfigEntry
}

ConfigResource holds parameters for altering an Apache Kafka configuration resource

func (ConfigResource) String 

func (c ConfigResource) String() string

String returns a human-readable representation of a ConfigResource

type ConfigResourceResult 

type ConfigResourceResult struct {
	// Type of returned result resource.
	Type ResourceType
	// Name of returned result resource.
	Name string
	// Error, if any, of returned result resource.
	Error Error
	// Config entries, if any, of returned result resource.
	Config map[string]ConfigEntryResult
}

ConfigResourceResult provides the result for a resource from a AlterConfigs or DescribeConfigs request.

func (ConfigResourceResult) String 

func (c ConfigResourceResult) String() string

String returns a human-readable representation of a ConfigResourceResult.

type ConfigSource 

type ConfigSource int

ConfigSource represents an Apache Kafka config source

func (ConfigSource) String 

func (t ConfigSource) String() string

String returns the human-readable representation of a ConfigSource type

type ConfigValue 

type ConfigValue interface{}

ConfigValue supports the following types: 

bool, int, string, any type with the standard String() interface

type Consumer 

type Consumer struct {
	// contains filtered or unexported fields
}

Consumer implements a High-level Apache Kafka Consumer instance

func NewConsumer 

func NewConsumer(conf *ConfigMap) (*Consumer, error)

NewConsumer creates a new high-level Consumer instance.

Supported special configuration properties: 

go.application.rebalance.enable (bool, false) - Forward rebalancing responsibility to application via the Events() channel.
                                     If set to true the app must handle the AssignedPartitions and
                                     RevokedPartitions events and call Assign() and Unassign()
                                     respectively.
go.events.channel.enable (bool, false) - Enable the Events() channel. Messages and events will be pushed on the Events() channel and the Poll() interface will be disabled. (Experimental)
go.events.channel.size (int, 1000) - Events() channel size

WARNING: Due to the buffering nature of channels (and queues in general) the use of the events channel risks receiving outdated events and messages. Minimizing go.events.channel.size reduces the risk and number of outdated events and messages but does not eliminate the factor completely. With a channel size of 1 at most one event or message may be outdated.

func (*Consumer) Assign 

func (c *Consumer) Assign(partitions []TopicPartition) (err error)

Assign an atomic set of partitions to consume. This replaces the current assignment.

func (*Consumer) Assignment 

func (c *Consumer) Assignment() (partitions []TopicPartition, err error)

Assignment returns the current partition assignments

func (*Consumer) Close 

func (c *Consumer) Close() (err error)

Close Consumer instance. The object is no longer usable after this call.

func (*Consumer) Commit 

func (c *Consumer) Commit() ([]TopicPartition, error)

Commit offsets for currently assigned partitions This is a blocking call. Returns the committed offsets on success.

func (*Consumer) CommitMessage 

func (c *Consumer) CommitMessage(m *Message) ([]TopicPartition, error)

CommitMessage commits offset based on the provided message. This is a blocking call. Returns the committed offsets on success.

func (*Consumer) CommitOffsets 

func (c *Consumer) CommitOffsets(offsets []TopicPartition) ([]TopicPartition, error)

CommitOffsets commits the provided list of offsets This is a blocking call. Returns the committed offsets on success.

func (*Consumer) Committed 

func (c *Consumer) Committed(partitions []TopicPartition, timeoutMs int) (offsets []TopicPartition, err error)

Committed retrieves committed offsets for the given set of partitions

func (*Consumer) Events 

func (c *Consumer) Events() chan Event

Events returns the Events channel (if enabled)

func (*Consumer) GetMetadata 

func (c *Consumer) GetMetadata(topic *string, allTopics bool, timeoutMs int) (*Metadata, error)

GetMetadata queries broker for cluster and topic metadata. If topic is non-nil only information about that topic is returned, else if allTopics is false only information about locally used topics is returned, else information about all topics is returned. GetMetadata is equivalent to listTopics, describeTopics and describeCluster in the Java API.

func (*Consumer) OffsetsForTimes 

func (c *Consumer) OffsetsForTimes(times []TopicPartition, timeoutMs int) (offsets []TopicPartition, err error)

OffsetsForTimes looks up offsets by timestamp for the given partitions.

The returned offset for each partition is the earliest offset whose timestamp is greater than or equal to the given timestamp in the corresponding partition.

The timestamps to query are represented as `.Offset` in the `times` argument and the looked up offsets are represented as `.Offset` in the returned `offsets` list.

The function will block for at most timeoutMs milliseconds.

Duplicate Topic+Partitions are not supported. Per-partition errors may be returned in the `.Error` field.

func (*Consumer) Pause 

func (c *Consumer) Pause(partitions []TopicPartition) (err error)

Pause consumption for the provided list of partitions

Note that messages already enqueued on the consumer's Event channel (if `go.events.channel.enable` has been set) will NOT be purged by this call, set `go.events.channel.size` accordingly.

func (*Consumer) Poll 

func (c *Consumer) Poll(timeoutMs int) (event Event)

Poll the consumer for messages or events.

Will block for at most timeoutMs milliseconds

The following callbacks may be triggered: 

Subscribe()'s rebalanceCb

Returns nil on timeout, else an Event

func (*Consumer) QueryWatermarkOffsets 

func (c *Consumer) QueryWatermarkOffsets(topic string, partition int32, timeoutMs int) (low, high int64, err error)

QueryWatermarkOffsets returns the broker's low and high offsets for the given topic and partition.

func (*Consumer) ReadMessage 

func (c *Consumer) ReadMessage(timeout time.Duration) (*Message, error)

ReadMessage polls the consumer for a message.

This is a conveniance API that wraps Poll() and only returns messages or errors. All other event types are discarded.

The call will block for at most `timeout` waiting for a new message or error. `timeout` may be set to -1 for indefinite wait.

Timeout is returned as (nil, err) where err is `kafka.(Error).Code == Kafka.ErrTimedOut`.

Messages are returned as (msg, nil), while general errors are returned as (nil, err), and partition-specific errors are returned as (msg, err) where msg.TopicPartition provides partition-specific information (such as topic, partition and offset).

All other event types, such as PartitionEOF, AssignedPartitions, etc, are silently discarded.

func (*Consumer) Resume 

func (c *Consumer) Resume(partitions []TopicPartition) (err error)

Resume consumption for the provided list of partitions

func (*Consumer) Seek 

func (c *Consumer) Seek(partition TopicPartition, timeoutMs int) error

Seek seeks the given topic partitions using the offset from the TopicPartition.

If timeoutMs is not 0 the call will wait this long for the seek to be performed. If the timeout is reached the internal state will be unknown and this function returns ErrTimedOut. If timeoutMs is 0 it will initiate the seek but return immediately without any error reporting (e.g., async).

Seek() may only be used for partitions already being consumed (through Assign() or implicitly through a self-rebalanced Subscribe()). To set the starting offset it is preferred to use Assign() and provide a starting offset for each partition.

Returns an error on failure or nil otherwise.

func (*Consumer) StoreOffsets 

func (c *Consumer) StoreOffsets(offsets []TopicPartition) (storedOffsets []TopicPartition, err error)

StoreOffsets stores the provided list of offsets that will be committed to the offset store according to `auto.commit.interval.ms` or manual offset-less Commit().

Returns the stored offsets on success. If at least one offset couldn't be stored, an error and a list of offsets is returned. Each offset can be checked for specific errors via its `.Error` member.

func (*Consumer) String 

func (c *Consumer) String() string

Strings returns a human readable name for a Consumer instance

func (*Consumer) Subscribe 

func (c *Consumer) Subscribe(topic string, rebalanceCb RebalanceCb) error

Subscribe to a single topic This replaces the current subscription

func (*Consumer) SubscribeTopics 

func (c *Consumer) SubscribeTopics(topics []string, rebalanceCb RebalanceCb) (err error)

SubscribeTopics subscribes to the provided list of topics. This replaces the current subscription.

func (*Consumer) Subscription 

func (c *Consumer) Subscription() (topics []string, err error)

Subscription returns the current subscription as set by Subscribe()

func (*Consumer) Unassign 

func (c *Consumer) Unassign() (err error)

Unassign the current set of partitions to consume.

func (*Consumer) Unsubscribe 

func (c *Consumer) Unsubscribe() (err error)

Unsubscribe from the current subscription, if any.

type CreatePartitionsAdminOption 

type CreatePartitionsAdminOption interface {
	// contains filtered or unexported methods
}

CreatePartitionsAdminOption - see setters.

See SetAdminRequestTimeout, SetAdminOperationTimeout, SetAdminValidateOnly.

type CreateTopicsAdminOption 

type CreateTopicsAdminOption interface {
	// contains filtered or unexported methods
}

CreateTopicsAdminOption - see setters.

See SetAdminRequestTimeout, SetAdminOperationTimeout, SetAdminValidateOnly.

type DeleteTopicsAdminOption 

type DeleteTopicsAdminOption interface {
	// contains filtered or unexported methods
}

DeleteTopicsAdminOption - see setters.

See SetAdminRequestTimeout, SetAdminOperationTimeout.

type DescribeConfigsAdminOption 

type DescribeConfigsAdminOption interface {
	// contains filtered or unexported methods
}

DescribeConfigsAdminOption - see setters.

See SetAdminRequestTimeout.

type Error 

type Error struct {
	// contains filtered or unexported fields
}

Error provides a Kafka-specific error container

func (Error) Code 

func (e Error) Code() ErrorCode

Code returns the ErrorCode of an Error

func (Error) Error 

func (e Error) Error() string

Error returns a human readable representation of an Error Same as Error.String()

func (Error) String 

func (e Error) String() string

String returns a human readable representation of an Error

type ErrorCode 

type ErrorCode int

ErrorCode is the integer representation of local and broker error codes 

const (
	// ErrBadMsg Local: Bad message format
	ErrBadMsg ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__BAD_MSG)
	// ErrBadCompression Local: Invalid compressed data
	ErrBadCompression ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__BAD_COMPRESSION)
	// ErrDestroy Local: Broker handle destroyed
	ErrDestroy ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__DESTROY)
	// ErrFail Local: Communication failure with broker
	ErrFail ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__FAIL)
	// ErrTransport Local: Broker transport failure
	ErrTransport ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__TRANSPORT)
	// ErrCritSysResource Local: Critical system resource failure
	ErrCritSysResource ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__CRIT_SYS_RESOURCE)
	// ErrResolve Local: Host resolution failure
	ErrResolve ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__RESOLVE)
	// ErrMsgTimedOut Local: Message timed out
	ErrMsgTimedOut ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__MSG_TIMED_OUT)
	// ErrPartitionEOF Broker: No more messages
	ErrPartitionEOF ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__PARTITION_EOF)
	// ErrUnknownPartition Local: Unknown partition
	ErrUnknownPartition ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__UNKNOWN_PARTITION)
	// ErrFs Local: File or filesystem error
	ErrFs ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__FS)
	// ErrUnknownTopic Local: Unknown topic
	ErrUnknownTopic ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__UNKNOWN_TOPIC)
	// ErrAllBrokersDown Local: All broker connections are down
	ErrAllBrokersDown ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__ALL_BROKERS_DOWN)
	// ErrInvalidArg Local: Invalid argument or configuration
	ErrInvalidArg ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__INVALID_ARG)
	// ErrTimedOut Local: Timed out
	ErrTimedOut ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__TIMED_OUT)
	// ErrQueueFull Local: Queue full
	ErrQueueFull ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__QUEUE_FULL)
	// ErrIsrInsuff Local: ISR count insufficient
	ErrIsrInsuff ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__ISR_INSUFF)
	// ErrNodeUpdate Local: Broker node update
	ErrNodeUpdate ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__NODE_UPDATE)
	// ErrSsl Local: SSL error
	ErrSsl ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__SSL)
	// ErrWaitCoord Local: Waiting for coordinator
	ErrWaitCoord ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__WAIT_COORD)
	// ErrUnknownGroup Local: Unknown group
	ErrUnknownGroup ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__UNKNOWN_GROUP)
	// ErrInProgress Local: Operation in progress
	ErrInProgress ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__IN_PROGRESS)
	// ErrPrevInProgress Local: Previous operation in progress
	ErrPrevInProgress ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__PREV_IN_PROGRESS)
	// ErrExistingSubscription Local: Existing subscription
	ErrExistingSubscription ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__EXISTING_SUBSCRIPTION)
	// ErrAssignPartitions Local: Assign partitions
	ErrAssignPartitions ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS)
	// ErrRevokePartitions Local: Revoke partitions
	ErrRevokePartitions ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__REVOKE_PARTITIONS)
	// ErrConflict Local: Conflicting use
	ErrConflict ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__CONFLICT)
	// ErrState Local: Erroneous state
	ErrState ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__STATE)
	// ErrUnknownProtocol Local: Unknown protocol
	ErrUnknownProtocol ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__UNKNOWN_PROTOCOL)
	// ErrNotImplemented Local: Not implemented
	ErrNotImplemented ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__NOT_IMPLEMENTED)
	// ErrAuthentication Local: Authentication failure
	ErrAuthentication ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__AUTHENTICATION)
	// ErrNoOffset Local: No offset stored
	ErrNoOffset ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__NO_OFFSET)
	// ErrOutdated Local: Outdated
	ErrOutdated ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__OUTDATED)
	// ErrTimedOutQueue Local: Timed out in queue
	ErrTimedOutQueue ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__TIMED_OUT_QUEUE)
	// ErrUnsupportedFeature Local: Required feature not supported by broker
	ErrUnsupportedFeature ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__UNSUPPORTED_FEATURE)
	// ErrWaitCache Local: Awaiting cache update
	ErrWaitCache ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__WAIT_CACHE)
	// ErrIntr Local: Operation interrupted
	ErrIntr ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__INTR)
	// ErrKeySerialization Local: Key serialization error
	ErrKeySerialization ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__KEY_SERIALIZATION)
	// ErrValueSerialization Local: Value serialization error
	ErrValueSerialization ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__VALUE_SERIALIZATION)
	// ErrKeyDeserialization Local: Key deserialization error
	ErrKeyDeserialization ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__KEY_DESERIALIZATION)
	// ErrValueDeserialization Local: Value deserialization error
	ErrValueDeserialization ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__VALUE_DESERIALIZATION)
	// ErrPartial Local: Partial response
	ErrPartial ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__PARTIAL)
	// ErrReadOnly Local: Read-only object
	ErrReadOnly ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__READ_ONLY)
	// ErrNoent Local: No such entry
	ErrNoent ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__NOENT)
	// ErrUnderflow Local: Read underflow
	ErrUnderflow ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__UNDERFLOW)
	// ErrInvalidType Local: Invalid type
	ErrInvalidType ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__INVALID_TYPE)
	// ErrRetry Local: Retry operation
	ErrRetry ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__RETRY)
	// ErrPurgeQueue Local: Purged in queue
	ErrPurgeQueue ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__PURGE_QUEUE)
	// ErrPurgeInflight Local: Purged in flight
	ErrPurgeInflight ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__PURGE_INFLIGHT)
	// ErrFatal Local: Fatal error
	ErrFatal ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__FATAL)
	// ErrInconsistent Local: Inconsistent state
	ErrInconsistent ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__INCONSISTENT)
	// ErrGaplessGuarantee Local: Gap-less ordering would not be guaranteed if proceeding
	ErrGaplessGuarantee ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__GAPLESS_GUARANTEE)
	// ErrMaxPollExceeded Local: Maximum application poll interval (max.poll.interval.ms) exceeded
	ErrMaxPollExceeded ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__MAX_POLL_EXCEEDED)
	// ErrUnknown Unknown broker error
	ErrUnknown ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNKNOWN)
	// ErrNoError Success
	ErrNoError ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NO_ERROR)
	// ErrOffsetOutOfRange Broker: Offset out of range
	ErrOffsetOutOfRange ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_OFFSET_OUT_OF_RANGE)
	// ErrInvalidMsg Broker: Invalid message
	ErrInvalidMsg ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_MSG)
	// ErrUnknownTopicOrPart Broker: Unknown topic or partition
	ErrUnknownTopicOrPart ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNKNOWN_TOPIC_OR_PART)
	// ErrInvalidMsgSize Broker: Invalid message size
	ErrInvalidMsgSize ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_MSG_SIZE)
	// ErrLeaderNotAvailable Broker: Leader not available
	ErrLeaderNotAvailable ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_LEADER_NOT_AVAILABLE)
	// ErrNotLeaderForPartition Broker: Not leader for partition
	ErrNotLeaderForPartition ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NOT_LEADER_FOR_PARTITION)
	// ErrRequestTimedOut Broker: Request timed out
	ErrRequestTimedOut ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_REQUEST_TIMED_OUT)
	// ErrBrokerNotAvailable Broker: Broker not available
	ErrBrokerNotAvailable ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_BROKER_NOT_AVAILABLE)
	// ErrReplicaNotAvailable Broker: Replica not available
	ErrReplicaNotAvailable ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_REPLICA_NOT_AVAILABLE)
	// ErrMsgSizeTooLarge Broker: Message size too large
	ErrMsgSizeTooLarge ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_MSG_SIZE_TOO_LARGE)
	// ErrStaleCtrlEpoch Broker: StaleControllerEpochCode
	ErrStaleCtrlEpoch ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_STALE_CTRL_EPOCH)
	// ErrOffsetMetadataTooLarge Broker: Offset metadata string too large
	ErrOffsetMetadataTooLarge ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_OFFSET_METADATA_TOO_LARGE)
	// ErrNetworkException Broker: Broker disconnected before response received
	ErrNetworkException ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NETWORK_EXCEPTION)
	// ErrGroupLoadInProgress Broker: Group coordinator load in progress
	ErrGroupLoadInProgress ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_GROUP_LOAD_IN_PROGRESS)
	// ErrGroupCoordinatorNotAvailable Broker: Group coordinator not available
	ErrGroupCoordinatorNotAvailable ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_GROUP_COORDINATOR_NOT_AVAILABLE)
	// ErrNotCoordinatorForGroup Broker: Not coordinator for group
	ErrNotCoordinatorForGroup ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NOT_COORDINATOR_FOR_GROUP)
	// ErrTopicException Broker: Invalid topic
	ErrTopicException ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_TOPIC_EXCEPTION)
	// ErrRecordListTooLarge Broker: Message batch larger than configured server segment size
	ErrRecordListTooLarge ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_RECORD_LIST_TOO_LARGE)
	// ErrNotEnoughReplicas Broker: Not enough in-sync replicas
	ErrNotEnoughReplicas ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NOT_ENOUGH_REPLICAS)
	// ErrNotEnoughReplicasAfterAppend Broker: Message(s) written to insufficient number of in-sync replicas
	ErrNotEnoughReplicasAfterAppend ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NOT_ENOUGH_REPLICAS_AFTER_APPEND)
	// ErrInvalidRequiredAcks Broker: Invalid required acks value
	ErrInvalidRequiredAcks ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_REQUIRED_ACKS)
	// ErrIllegalGeneration Broker: Specified group generation id is not valid
	ErrIllegalGeneration ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_ILLEGAL_GENERATION)
	// ErrInconsistentGroupProtocol Broker: Inconsistent group protocol
	ErrInconsistentGroupProtocol ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INCONSISTENT_GROUP_PROTOCOL)
	// ErrInvalidGroupID Broker: Invalid group.id
	ErrInvalidGroupID ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_GROUP_ID)
	// ErrUnknownMemberID Broker: Unknown member
	ErrUnknownMemberID ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNKNOWN_MEMBER_ID)
	// ErrInvalidSessionTimeout Broker: Invalid session timeout
	ErrInvalidSessionTimeout ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_SESSION_TIMEOUT)
	// ErrRebalanceInProgress Broker: Group rebalance in progress
	ErrRebalanceInProgress ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_REBALANCE_IN_PROGRESS)
	// ErrInvalidCommitOffsetSize Broker: Commit offset data size is not valid
	ErrInvalidCommitOffsetSize ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_COMMIT_OFFSET_SIZE)
	// ErrTopicAuthorizationFailed Broker: Topic authorization failed
	ErrTopicAuthorizationFailed ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_TOPIC_AUTHORIZATION_FAILED)
	// ErrGroupAuthorizationFailed Broker: Group authorization failed
	ErrGroupAuthorizationFailed ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_GROUP_AUTHORIZATION_FAILED)
	// ErrClusterAuthorizationFailed Broker: Cluster authorization failed
	ErrClusterAuthorizationFailed ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_CLUSTER_AUTHORIZATION_FAILED)
	// ErrInvalidTimestamp Broker: Invalid timestamp
	ErrInvalidTimestamp ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_TIMESTAMP)
	// ErrUnsupportedSaslMechanism Broker: Unsupported SASL mechanism
	ErrUnsupportedSaslMechanism ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNSUPPORTED_SASL_MECHANISM)
	// ErrIllegalSaslState Broker: Request not valid in current SASL state
	ErrIllegalSaslState ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_ILLEGAL_SASL_STATE)
	// ErrUnsupportedVersion Broker: API version not supported
	ErrUnsupportedVersion ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNSUPPORTED_VERSION)
	// ErrTopicAlreadyExists Broker: Topic already exists
	ErrTopicAlreadyExists ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_TOPIC_ALREADY_EXISTS)
	// ErrInvalidPartitions Broker: Invalid number of partitions
	ErrInvalidPartitions ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_PARTITIONS)
	// ErrInvalidReplicationFactor Broker: Invalid replication factor
	ErrInvalidReplicationFactor ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_REPLICATION_FACTOR)
	// ErrInvalidReplicaAssignment Broker: Invalid replica assignment
	ErrInvalidReplicaAssignment ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_REPLICA_ASSIGNMENT)
	// ErrInvalidConfig Broker: Configuration is invalid
	ErrInvalidConfig ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_CONFIG)
	// ErrNotController Broker: Not controller for cluster
	ErrNotController ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NOT_CONTROLLER)
	// ErrInvalidRequest Broker: Invalid request
	ErrInvalidRequest ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_REQUEST)
	// ErrUnsupportedForMessageFormat Broker: Message format on broker does not support request
	ErrUnsupportedForMessageFormat ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNSUPPORTED_FOR_MESSAGE_FORMAT)
	// ErrPolicyViolation Broker: Isolation policy volation
	ErrPolicyViolation ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_POLICY_VIOLATION)
	// ErrOutOfOrderSequenceNumber Broker: Broker received an out of order sequence number
	ErrOutOfOrderSequenceNumber ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_OUT_OF_ORDER_SEQUENCE_NUMBER)
	// ErrDuplicateSequenceNumber Broker: Broker received a duplicate sequence number
	ErrDuplicateSequenceNumber ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_DUPLICATE_SEQUENCE_NUMBER)
	// ErrInvalidProducerEpoch Broker: Producer attempted an operation with an old epoch
	ErrInvalidProducerEpoch ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_PRODUCER_EPOCH)
	// ErrInvalidTxnState Broker: Producer attempted a transactional operation in an invalid state
	ErrInvalidTxnState ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_TXN_STATE)
	// ErrInvalidProducerIDMapping Broker: Producer attempted to use a producer id which is not currently assigned to its transactional id
	ErrInvalidProducerIDMapping ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_PRODUCER_ID_MAPPING)
	// ErrInvalidTransactionTimeout Broker: Transaction timeout is larger than the maximum value allowed by the broker's max.transaction.timeout.ms
	ErrInvalidTransactionTimeout ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_TRANSACTION_TIMEOUT)
	// ErrConcurrentTransactions Broker: Producer attempted to update a transaction while another concurrent operation on the same transaction was ongoing
	ErrConcurrentTransactions ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_CONCURRENT_TRANSACTIONS)
	// ErrTransactionCoordinatorFenced Broker: Indicates that the transaction coordinator sending a WriteTxnMarker is no longer the current coordinator for a given producer
	ErrTransactionCoordinatorFenced ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_TRANSACTION_COORDINATOR_FENCED)
	// ErrTransactionalIDAuthorizationFailed Broker: Transactional Id authorization failed
	ErrTransactionalIDAuthorizationFailed ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_TRANSACTIONAL_ID_AUTHORIZATION_FAILED)
	// ErrSecurityDisabled Broker: Security features are disabled
	ErrSecurityDisabled ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_SECURITY_DISABLED)
	// ErrOperationNotAttempted Broker: Operation not attempted
	ErrOperationNotAttempted ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_OPERATION_NOT_ATTEMPTED)
	// ErrKafkaStorageError Disk error when trying to access log file on the disk
	ErrKafkaStorageError ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_KAFKA_STORAGE_ERROR)
	// ErrLogDirNotFound The user-specified log directory is not found in the broker config
	ErrLogDirNotFound ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_LOG_DIR_NOT_FOUND)
	// ErrSaslAuthenticationFailed SASL Authentication failed
	ErrSaslAuthenticationFailed ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_SASL_AUTHENTICATION_FAILED)
	// ErrUnknownProducerID Unknown Producer Id
	ErrUnknownProducerID ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNKNOWN_PRODUCER_ID)
	// ErrReassignmentInProgress Partition reassignment is in progress
	ErrReassignmentInProgress ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_REASSIGNMENT_IN_PROGRESS)
	// ErrDelegationTokenAuthDisabled Delegation Token feature is not enabled
	ErrDelegationTokenAuthDisabled ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_AUTH_DISABLED)
	// ErrDelegationTokenNotFound Delegation Token is not found on server
	ErrDelegationTokenNotFound ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_NOT_FOUND)
	// ErrDelegationTokenOwnerMismatch Specified Principal is not valid Owner/Renewer
	ErrDelegationTokenOwnerMismatch ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_OWNER_MISMATCH)
	// ErrDelegationTokenRequestNotAllowed Delegation Token requests are not allowed on this connection
	ErrDelegationTokenRequestNotAllowed ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_REQUEST_NOT_ALLOWED)
	// ErrDelegationTokenAuthorizationFailed Delegation Token authorization failed
	ErrDelegationTokenAuthorizationFailed ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_AUTHORIZATION_FAILED)
	// ErrDelegationTokenExpired Delegation Token is expired
	ErrDelegationTokenExpired ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_EXPIRED)
	// ErrInvalidPrincipalType Supplied principalType is not supported
	ErrInvalidPrincipalType ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_PRINCIPAL_TYPE)
	// ErrNonEmptyGroup The group is not empty
	ErrNonEmptyGroup ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NON_EMPTY_GROUP)
	// ErrGroupIDNotFound The group id does not exist
	ErrGroupIDNotFound ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_GROUP_ID_NOT_FOUND)
	// ErrFetchSessionIDNotFound The fetch session ID was not found
	ErrFetchSessionIDNotFound ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_FETCH_SESSION_ID_NOT_FOUND)
	// ErrInvalidFetchSessionEpoch The fetch session epoch is invalid
	ErrInvalidFetchSessionEpoch ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_FETCH_SESSION_EPOCH)
	// ErrListenerNotFound No matching listener
	ErrListenerNotFound ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_LISTENER_NOT_FOUND)
	// ErrTopicDeletionDisabled Topic deletion is disabled
	ErrTopicDeletionDisabled ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_TOPIC_DELETION_DISABLED)
	// ErrUnsupportedCompressionType Unsupported compression type
	ErrUnsupportedCompressionType ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNSUPPORTED_COMPRESSION_TYPE)
)

func (ErrorCode) String 

func (c ErrorCode) String() string

String returns a human readable representation of an error code

type Event 

type Event interface {
	// String returns a human-readable representation of the event
	String() string
}

Event generic interface

type Handle 

type Handle interface {
	// contains filtered or unexported methods
}

Handle represents a generic client handle containing common parts for both Producer and Consumer. 

type Header struct {
	Key   string // Header name (utf-8 string)
	Value []byte // Header value (nil, empty, or binary)
}

Header represents a single Kafka message header.

Message headers are made up of a list of Header elements, retaining their original insert order and allowing for duplicate Keys.

Key is a human readable string identifying the header. Value is the key's binary value, Kafka does not put any restrictions on the format of of the Value but it should be made relatively compact. The value may be a byte array, empty, or nil.

NOTE: Message headers are not available on producer delivery report messages.

func (Header) String 

func (h Header) String() string

String returns the Header Key and data in a human representable possibly truncated form suitable for displaying to the user.

type Message 

type Message struct {
	TopicPartition TopicPartition
	Value          []byte
	Key            []byte
	Timestamp      time.Time
	TimestampType  TimestampType
	Opaque         interface{}
	Headers        []Header
}

Message represents a Kafka message

func (*Message) String 

func (m *Message) String() string

String returns a human readable representation of a Message. Key and payload are not represented.

type Metadata 

type Metadata struct {
	Brokers []BrokerMetadata
	Topics  map[string]TopicMetadata

	OriginatingBroker BrokerMetadata
}

Metadata contains broker and topic metadata for all (matching) topics

type Offset 

type Offset int64

Offset type (int64) with support for canonical names

func NewOffset 

func NewOffset(offset interface{}) (Offset, error)

NewOffset creates a new Offset using the provided logical string, or an absolute int64 offset value. Logical offsets: "beginning", "earliest", "end", "latest", "unset", "invalid", "stored"

func OffsetTail 

func OffsetTail(relativeOffset Offset) Offset

OffsetTail returns the logical offset relativeOffset from current end of partition

func (*Offset) Set 

func (o *Offset) Set(offset interface{}) error

Set offset value, see NewOffset()

func (Offset) String 

func (o Offset) String() string

type OffsetsCommitted 

type OffsetsCommitted struct {
	Error   error
	Offsets []TopicPartition
}

OffsetsCommitted reports committed offsets

func (OffsetsCommitted) String 

func (o OffsetsCommitted) String() string

type PartitionEOF 

type PartitionEOF TopicPartition

PartitionEOF consumer reached end of partition Needs to be explicitly enabled by setting the `enable.partition.eof` configuration property to true.

func (PartitionEOF) String 

func (p PartitionEOF) String() string

type PartitionMetadata 

type PartitionMetadata struct {
	ID       int32
	Error    Error
	Leader   int32
	Replicas []int32
	Isrs     []int32
}

PartitionMetadata contains per-partition metadata

type PartitionsSpecification 

type PartitionsSpecification struct {
	// Topic to create more partitions for.
	Topic string
	// New partition count for topic, must be higher than current partition count.
	IncreaseTo int
	// (Optional) Explicit replica assignment. The outer array is
	// indexed by the new partition index (i.e., 0 for the first added
	// partition), while the inner per-partition array
	// contains the replica broker ids. The first broker in each
	// broker id list will be the preferred replica.
	ReplicaAssignment [][]int32
}

PartitionsSpecification holds parameters for creating additional partitions for a topic. PartitionsSpecification is analogous to NewPartitions in the Java Topic Admin API.

type Producer 

type Producer struct {
	// contains filtered or unexported fields
}

Producer implements a High-level Apache Kafka Producer instance

func NewProducer 

func NewProducer(conf *ConfigMap) (*Producer, error)

NewProducer creates a new high-level Producer instance.

conf is a *ConfigMap with standard librdkafka configuration properties, see here:

Supported special configuration properties: 

go.batch.producer (bool, false) - EXPERIMENTAL: Enable batch producer (for increased performance).
                                  These batches do not relate to Kafka message batches in any way.
                                  Note: timestamps and headers are not supported with this interface.
go.delivery.reports (bool, true) - Forward per-message delivery reports to the
                                   Events() channel.
go.events.channel.size (int, 1000000) - Events() channel size
go.produce.channel.size (int, 1000000) - ProduceChannel() buffer size (in number of messages)

func (*Producer) Close 

func (p *Producer) Close()

Close a Producer instance. The Producer object or its channels are no longer usable after this call.

func (*Producer) Events 

func (p *Producer) Events() chan Event

Events returns the Events channel (read)

func (*Producer) Flush 

func (p *Producer) Flush(timeoutMs int) int

Flush and wait for outstanding messages and requests to complete delivery. Includes messages on ProduceChannel. Runs until value reaches zero or on timeoutMs. Returns the number of outstanding events still un-flushed.

func (*Producer) GetMetadata 

func (p *Producer) GetMetadata(topic *string, allTopics bool, timeoutMs int) (*Metadata, error)

GetMetadata queries broker for cluster and topic metadata. If topic is non-nil only information about that topic is returned, else if allTopics is false only information about locally used topics is returned, else information about all topics is returned. GetMetadata is equivalent to listTopics, describeTopics and describeCluster in the Java API.

func (*Producer) Len 

func (p *Producer) Len() int

Len returns the number of messages and requests waiting to be transmitted to the broker as well as delivery reports queued for the application. Includes messages on ProduceChannel.

func (*Producer) OffsetsForTimes 

func (p *Producer) OffsetsForTimes(times []TopicPartition, timeoutMs int) (offsets []TopicPartition, err error)

OffsetsForTimes looks up offsets by timestamp for the given partitions.

The returned offset for each partition is the earliest offset whose timestamp is greater than or equal to the given timestamp in the corresponding partition.

The timestamps to query are represented as `.Offset` in the `times` argument and the looked up offsets are represented as `.Offset` in the returned `offsets` list.

The function will block for at most timeoutMs milliseconds.

Duplicate Topic+Partitions are not supported. Per-partition errors may be returned in the `.Error` field.

func (*Producer) Produce 

func (p *Producer) Produce(msg *Message, deliveryChan chan Event) error

Produce single message. This is an asynchronous call that enqueues the message on the internal transmit queue, thus returning immediately. The delivery report will be sent on the provided deliveryChan if specified, or on the Producer object's Events() channel if not. msg.Timestamp requires librdkafka >= 0.9.4 (else returns ErrNotImplemented), api.version.request=true, and broker >= 0.10.0.0. msg.Headers requires librdkafka >= 0.11.4 (else returns ErrNotImplemented), api.version.request=true, and broker >= 0.11.0.0. Returns an error if message could not be enqueued.

func (*Producer) ProduceChannel 

func (p *Producer) ProduceChannel() chan *Message

ProduceChannel returns the produce *Message channel (write)

func (*Producer) QueryWatermarkOffsets 

func (p *Producer) QueryWatermarkOffsets(topic string, partition int32, timeoutMs int) (low, high int64, err error)

QueryWatermarkOffsets returns the broker's low and high offsets for the given topic and partition.

func (*Producer) String 

func (p *Producer) String() string

String returns a human readable name for a Producer instance

type RebalanceCb 

type RebalanceCb func(*Consumer, Event) error

RebalanceCb provides a per-Subscribe*() rebalance event callback. The passed Event will be either AssignedPartitions or RevokedPartitions

type ResourceType 

type ResourceType int

ResourceType represents an Apache Kafka resource type

func ResourceTypeFromString 

func ResourceTypeFromString(typeString string) (ResourceType, error)

ResourceTypeFromString translates a resource type name/string to a ResourceType value.

func (ResourceType) String 

func (t ResourceType) String() string

String returns the human-readable representation of a ResourceType

type RevokedPartitions 

type RevokedPartitions struct {
	Partitions []TopicPartition
}

RevokedPartitions consumer group rebalance event: revoked partition set

func (RevokedPartitions) String 

func (e RevokedPartitions) String() string

type Stats 

type Stats struct {
	// contains filtered or unexported fields
}

Stats statistics event

func (Stats) String 

func (e Stats) String() string

type TimestampType 

type TimestampType int

TimestampType is a the Message timestamp type or source

func (TimestampType) String 

func (t TimestampType) String() string

type TopicMetadata 

type TopicMetadata struct {
	Topic      string
	Partitions []PartitionMetadata
	Error      Error
}

TopicMetadata contains per-topic metadata

type TopicPartition 

type TopicPartition struct {
	Topic     *string
	Partition int32
	Offset    Offset
	Error     error
}

TopicPartition is a generic placeholder for a Topic+Partition and optionally Offset.

func (TopicPartition) String 

func (p TopicPartition) String() string

type TopicPartitions 

type TopicPartitions []TopicPartition

TopicPartitions is a slice of TopicPartitions that also implements the sort interface

func (TopicPartitions) Len 

func (tps TopicPartitions) Len() int

func (TopicPartitions) Less 

func (tps TopicPartitions) Less(i, j int) bool

func (TopicPartitions) Swap 

func (tps TopicPartitions) Swap(i, j int)

type TopicResult 

type TopicResult struct {
	// Topic name
	Topic string
	// Error, if any, of result. Check with `Error.Code() != ErrNoError`.
	Error Error
}

TopicResult provides per-topic operation result (error) information.

func (TopicResult) String 

func (t TopicResult) String() string

String returns a human-readable representation of a TopicResult.

type TopicSpecification 

type TopicSpecification struct {
	// Topic name to create.
	Topic string
	// Number of partitions in topic.
	NumPartitions int
	// Default replication factor for the topic's partitions, or zero
	// if an explicit ReplicaAssignment is set.
	ReplicationFactor int
	// (Optional) Explicit replica assignment. The outer array is
	// indexed by the partition number, while the inner per-partition array
	// contains the replica broker ids. The first broker in each
	// broker id list will be the preferred replica.
	ReplicaAssignment [][]int32
	// Topic configuration.
	Config map[string]string
}

TopicSpecification holds parameters for creating a new topic. TopicSpecification is analogous to NewTopic in the Java Topic Admin API.

Source Files

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Directories

Path Synopsis
confluent-kafka-go internal tool to generate error constants from librdkafka
 confluent-kafka-go internal tool to generate error constants from librdkafka

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