input

package
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 Go to latest Published: Nov 13, 2017 License: MIT Imports: 33 Imported by: 0

Documentation

Overview

Package input defines consumers for aggregating data from a variety of sources. All consumer types must implement interface input.Type.

If the source of a consumer is given assurances of message receipt then the consumer must ensure that all messages read from a source are propagated to a reader before shutting down gracefully. For example, a ZMQ subscriber model based consumer would not need to provide such ensurance, a HTTP POST based consumer, however, would be expected to propagate any requests where a 200 OK message has been returned.

Index

Constants

This section is empty.

Variables

View Source 
var (
	// ErrFanInNoInputs is returned when creating a FanIn type with zero inputs.
	ErrFanInNoInputs = errors.New("attempting to create fan_in input type with no inputs")
)
View Source 
var (
	ErrHWMInvalid = errors.New("high water mark is invalid (must be integer greater than 1)")
)

Errors for the HTTPServer type.

Functions

func Descriptions 

func Descriptions() string

Descriptions returns a formatted string of descriptions for each type.

Types

type AMQP added in v0.0.2 

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

AMQP is an input type that serves Scalability Protocols messages.

func (*AMQP) CloseAsync added in v0.0.2 

func (a *AMQP) CloseAsync()

CloseAsync shuts down the AMQP input and stops processing requests.

func (*AMQP) MessageChan added in v0.0.2 

func (a *AMQP) MessageChan() <-chan types.Message

MessageChan returns the messages channel.

func (*AMQP) StartListening added in v0.0.2 

func (a *AMQP) StartListening(responses <-chan types.Response) error

StartListening sets the channel used by the input to validate message receipt.

func (*AMQP) WaitForClose added in v0.0.2 

func (a *AMQP) WaitForClose(timeout time.Duration) error

WaitForClose blocks until the AMQP input has closed down.

type AMQPConfig added in v0.0.2 

type AMQPConfig struct {
	URI           string `json:"uri" yaml:"uri"`
	Exchange      string `json:"exchange" yaml:"exchange"`
	ExchangeType  string `json:"exchange_type" yaml:"exchange_type"`
	Queue         string `json:"queue" yaml:"queue"`
	BindingKey    string `json:"key" yaml:"key"`
	ConsumerTag   string `json:"consumer_tag" yaml:"consumer_tag"`
	PrefetchCount int    `json:"prefetch_count" yaml:"prefetch_count"`
	PrefetchSize  int    `json:"prefetch_size" yaml:"prefetch_size"`
}

AMQPConfig is configuration for the AMQP input type.

func NewAMQPConfig added in v0.0.2 

func NewAMQPConfig() AMQPConfig

NewAMQPConfig creates a new AMQPConfig with default values.

type Config 

type Config struct {
	Type       string             `json:"type" yaml:"type"`
	HTTPServer HTTPServerConfig   `json:"http_server" yaml:"http_server"`
	ScaleProto ScaleProtoConfig   `json:"scalability_protocols" yaml:"scalability_protocols"`
	ZMQ4       *ZMQ4Config        `json:"zmq4,omitempty" yaml:"zmq4,omitempty"`
	Kafka      KafkaConfig        `json:"kafka" yaml:"kafka"`
	AMQP       AMQPConfig         `json:"amqp" yaml:"amqp"`
	NSQ        NSQConfig          `json:"nsq" yaml:"nsq"`
	NATS       NATSConfig         `json:"nats" yaml:"nats"`
	File       FileConfig         `json:"file" yaml:"file"`
	STDIN      STDINConfig        `json:"stdin" yaml:"stdin"`
	FanIn      FanInConfig        `json:"fan_in" yaml:"fan_in"`
	Processors []processor.Config `json:"processors" yaml:"processors"`
}

Config is the all encompassing configuration struct for all input types. Note that some configs are empty structs, as the type has no optional values but we want to list it as an option.

func NewConfig 

func NewConfig() Config

NewConfig returns a configuration struct fully populated with default values.

type FanInConfig 

type FanInConfig struct {
	Inputs []interface{} `json:"inputs" yaml:"inputs"`
}

FanInConfig is configuration for the FanIn input type.

func NewFanInConfig 

func NewFanInConfig() FanInConfig

NewFanInConfig creates a new FanInConfig with default values.

type File 

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

File is an input type that reads lines from a file, creating a message per line.

func (*File) CloseAsync 

func (f *File) CloseAsync()

CloseAsync shuts down the File input and stops processing requests.

func (*File) MessageChan 

func (f *File) MessageChan() <-chan types.Message

MessageChan returns the messages channel.

func (*File) StartListening 

func (f *File) StartListening(responses <-chan types.Response) error

StartListening sets the channel used by the input to validate message receipt.

func (*File) WaitForClose 

func (f *File) WaitForClose(timeout time.Duration) error

WaitForClose blocks until the File input has closed down.

type FileConfig 

type FileConfig struct {
	Path      string `json:"path" yaml:"path"`
	Multipart bool   `json:"multipart" yaml:"multipart"`
	MaxBuffer int    `json:"max_buffer" yaml:"max_buffer"`
}

FileConfig is configuration values for the File input type.

func NewFileConfig 

func NewFileConfig() FileConfig

NewFileConfig creates a new FileConfig with default values.

type HTTPServer 

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

HTTPServer is an input type that serves HTTPServer POST requests.

func (*HTTPServer) CloseAsync 

func (h *HTTPServer) CloseAsync()

CloseAsync shuts down the HTTPServer input and stops processing requests.

func (*HTTPServer) MessageChan 

func (h *HTTPServer) MessageChan() <-chan types.Message

MessageChan returns the messages channel.

func (*HTTPServer) StartListening 

func (h *HTTPServer) StartListening(responses <-chan types.Response) error

StartListening sets the channel used by the input to validate message receipt.

func (*HTTPServer) WaitForClose 

func (h *HTTPServer) WaitForClose(timeout time.Duration) error

WaitForClose blocks until the HTTPServer input has closed down.

type HTTPServerConfig 

type HTTPServerConfig struct {
	Address   string `json:"address" yaml:"address"`
	Path      string `json:"path" yaml:"path"`
	TimeoutMS int64  `json:"timeout_ms" yaml:"timeout_ms"`
}

HTTPServerConfig is configuration for the HTTPServer input type.

func NewHTTPServerConfig 

func NewHTTPServerConfig() HTTPServerConfig

NewHTTPServerConfig creates a new HTTPServerConfig with default values.

type Kafka 

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

Kafka is an input type that reads from a Kafka instance.

func (*Kafka) CloseAsync 

func (k *Kafka) CloseAsync()

CloseAsync shuts down the Kafka input and stops processing requests.

func (*Kafka) MessageChan 

func (k *Kafka) MessageChan() <-chan types.Message

MessageChan returns the messages channel.

func (*Kafka) StartListening 

func (k *Kafka) StartListening(responses <-chan types.Response) error

StartListening sets the channel used by the input to validate message receipt.

func (*Kafka) WaitForClose 

func (k *Kafka) WaitForClose(timeout time.Duration) error

WaitForClose blocks until the Kafka input has closed down.

type KafkaConfig 

type KafkaConfig struct {
	Addresses       []string `json:"addresses" yaml:"addresses"`
	ClientID        string   `json:"client_id" yaml:"client_id"`
	ConsumerGroup   string   `json:"consumer_group" yaml:"consumer_group"`
	Topic           string   `json:"topic" yaml:"topic"`
	Partition       int32    `json:"partition" yam:"partition"`
	StartFromOldest bool     `json:"start_from_oldest" yaml:"start_from_oldest"`
}

KafkaConfig is configuration for the Kafka input type.

func NewKafkaConfig 

func NewKafkaConfig() KafkaConfig

NewKafkaConfig creates a new KafkaConfig with default values.

type NATS added in v0.2.2 

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

NATS is an input type that receives NATS messages.

func (*NATS) CloseAsync added in v0.2.2 

func (n *NATS) CloseAsync()

CloseAsync shuts down the NATS input and stops processing requests.

func (*NATS) MessageChan added in v0.2.2 

func (n *NATS) MessageChan() <-chan types.Message

MessageChan returns the messages channel.

func (*NATS) StartListening added in v0.2.2 

func (n *NATS) StartListening(responses <-chan types.Response) error

StartListening sets the channel used by the input to validate message receipt.

func (*NATS) WaitForClose added in v0.2.2 

func (n *NATS) WaitForClose(timeout time.Duration) error

WaitForClose blocks until the NATS input has closed down.

type NATSConfig added in v0.2.2 

type NATSConfig struct {
	URL     string `json:"url" yaml:"url"`
	Subject string `json:"subject" yaml:"subject"`
}

NATSConfig is configuration for the NATS input type.

func NewNATSConfig added in v0.2.2 

func NewNATSConfig() NATSConfig

NewNATSConfig creates a new NATSConfig with default values.

type NSQ added in v0.1.1 

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

NSQ is an input type that receives NSQ messages.

func (*NSQ) CloseAsync added in v0.1.1 

func (n *NSQ) CloseAsync()

CloseAsync shuts down the NSQ input and stops processing requests.

func (*NSQ) HandleMessage added in v0.1.1 

func (n *NSQ) HandleMessage(message *nsq.Message) error

HandleMessage handles an NSQ message.

func (*NSQ) MessageChan added in v0.1.1 

func (n *NSQ) MessageChan() <-chan types.Message

MessageChan returns the messages channel.

func (*NSQ) StartListening added in v0.1.1 

func (n *NSQ) StartListening(responses <-chan types.Response) error

StartListening sets the channel used by the input to validate message receipt.

func (*NSQ) WaitForClose added in v0.1.1 

func (n *NSQ) WaitForClose(timeout time.Duration) error

WaitForClose blocks until the NSQ input has closed down.

type NSQConfig added in v0.1.1 

type NSQConfig struct {
	Addresses       []string `json:"nsqd_tcp_addresses" yaml:"nsqd_tcp_addresses"`
	LookupAddresses []string `json:"lookupd_http_addresses" yaml:"lookupd_http_addresses"`
	Topic           string   `json:"topic" yaml:"topic"`
	Channel         string   `json:"channel" yaml:"channel"`
	UserAgent       string   `json:"user_agent" yaml:"user_agent"`
	MaxInFlight     int      `json:"max_in_flight" yaml:"max_in_flight"`
}

NSQConfig is configuration for the NSQ input type.

func NewNSQConfig added in v0.1.1 

func NewNSQConfig() NSQConfig

NewNSQConfig creates a new NSQConfig with default values.

type PipelineConstructor added in v0.2.9 

type PipelineConstructor func() (pipeline.Type, error)

PipelineConstructor is a func that constructs a unique pipeline.

type STDIN 

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

STDIN is an input type that reads lines from STDIN.

func (*STDIN) CloseAsync 

func (s *STDIN) CloseAsync()

CloseAsync shuts down the STDIN input and stops processing requests.

func (*STDIN) MessageChan 

func (s *STDIN) MessageChan() <-chan types.Message

MessageChan returns the messages channel.

func (*STDIN) StartListening 

func (s *STDIN) StartListening(responses <-chan types.Response) error

StartListening sets the channel used by the input to validate message receipt.

func (*STDIN) WaitForClose 

func (s *STDIN) WaitForClose(timeout time.Duration) error

WaitForClose blocks until the STDIN input has closed down.

type STDINConfig added in v0.0.2 

type STDINConfig struct {
	Multipart bool `json:"multipart" yaml:"multipart"`
	MaxBuffer int  `json:"max_buffer" yaml:"max_buffer"`
}

STDINConfig contains config fields for the STDIN input type.

func NewSTDINConfig added in v0.0.2 

func NewSTDINConfig() STDINConfig

NewSTDINConfig creates a STDINConfig populated with default values.

type ScaleProto 

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

ScaleProto is an input type that serves Scalability Protocols messages.

func (*ScaleProto) CloseAsync 

func (s *ScaleProto) CloseAsync()

CloseAsync shuts down the ScaleProto input and stops processing requests.

func (*ScaleProto) MessageChan 

func (s *ScaleProto) MessageChan() <-chan types.Message

MessageChan returns the messages channel.

func (*ScaleProto) StartListening 

func (s *ScaleProto) StartListening(responses <-chan types.Response) error

StartListening sets the channel used by the input to validate message receipt.

func (*ScaleProto) WaitForClose 

func (s *ScaleProto) WaitForClose(timeout time.Duration) error

WaitForClose blocks until the ScaleProto input has closed down.

type ScaleProtoConfig 

type ScaleProtoConfig struct {
	Addresses     []string `json:"addresses" yaml:"addresses"`
	Bind          bool     `json:"bind_address" yaml:"bind_address"`
	SocketType    string   `json:"socket_type" yaml:"socket_type"`
	SuccessStr    string   `json:"reply_success" yaml:"reply_success"`
	ErrorStr      string   `json:"reply_error" yaml:"reply_error"`
	SubFilters    []string `json:"sub_filters" yaml:"sub_filters"`
	PollTimeoutMS int      `json:"poll_timeout_ms" yaml:"poll_timeout_ms"`
	RepTimeoutMS  int      `json:"reply_timeout_ms" yaml:"reply_timeout_ms"`
}

ScaleProtoConfig is configuration for the ScaleProto input type.

func NewScaleProtoConfig 

func NewScaleProtoConfig() ScaleProtoConfig

NewScaleProtoConfig creates a new ScaleProtoConfig with default values.

type Type 

type Type interface {
	types.Closable
	types.Producer
}

Type is the standard interface of an input type.

func New added in v0.0.2 

func New(
	conf Config,
	log log.Modular,
	stats metrics.Type,
	pipelines ...PipelineConstructor,
) (Type, error)

New creates an input type based on an input configuration.

func NewAMQP added in v0.0.2 

func NewAMQP(conf Config, log log.Modular, stats metrics.Type) (Type, error)

NewAMQP creates a new AMQP input type.

func NewFanIn 

func NewFanIn(
	conf Config,
	log log.Modular,
	stats metrics.Type,
	pipelines ...PipelineConstructor,
) (Type, error)

NewFanIn creates a new FanIn input type.

func NewFile 

func NewFile(conf Config, log log.Modular, stats metrics.Type) (Type, error)

NewFile creates a new File input type.

func NewHTTPServer 

func NewHTTPServer(conf Config, log log.Modular, stats metrics.Type) (Type, error)

NewHTTPServer creates a new HTTPServer input type.

func NewKafka 

func NewKafka(conf Config, log log.Modular, stats metrics.Type) (Type, error)

NewKafka creates a new Kafka input type.

func NewNATS added in v0.2.2 

func NewNATS(conf Config, log log.Modular, stats metrics.Type) (Type, error)

NewNATS creates a new NATS input type.

func NewNSQ added in v0.1.1 

func NewNSQ(conf Config, log log.Modular, stats metrics.Type) (Type, error)

NewNSQ create a new NSQ input type.

func NewSTDIN 

func NewSTDIN(conf Config, log log.Modular, stats metrics.Type) (Type, error)

NewSTDIN creates a new STDIN input type.

func NewScaleProto 

func NewScaleProto(conf Config, log log.Modular, stats metrics.Type) (Type, error)

NewScaleProto creates a new ScaleProto input type.

func WrapWithPipelines added in v0.2.9 

func WrapWithPipelines(in Type, pipeConstructors ...PipelineConstructor) (Type, error)

WrapWithPipelines wraps an input with a variadic number of pipelines.

type WithPipeline added in v0.2.9 

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

WithPipeline is a type that wraps both an input type and a pipeline type by routing the input through the pipeline, and implements the input.Type interface in order to act like an ordinary input.

func WrapWithPipeline added in v0.2.9 

func WrapWithPipeline(in Type, pipeConstructor PipelineConstructor) (*WithPipeline, error)

WrapWithPipeline routes an input directly into a processing pipeline and returns a type that manages both and acts like an ordinary input.

func (*WithPipeline) CloseAsync added in v0.2.9 

func (i *WithPipeline) CloseAsync()

CloseAsync triggers a closure of this object but does not block.

func (*WithPipeline) MessageChan added in v0.2.9 

func (i *WithPipeline) MessageChan() <-chan types.Message

MessageChan returns the channel used for consuming messages from this input.

func (*WithPipeline) StartListening added in v0.2.9 

func (i *WithPipeline) StartListening(resChan <-chan types.Response) error

StartListening starts the type listening to a response channel from a consumer.

func (*WithPipeline) WaitForClose added in v0.2.9 

func (i *WithPipeline) WaitForClose(timeout time.Duration) error

WaitForClose is a blocking call to wait until the object has finished closing down and cleaning up resources.

type ZMQ4Config 

type ZMQ4Config struct{}

ZMQ4Config is an empty stub for when ZMQ4 is not compiled.

func NewZMQ4Config 

func NewZMQ4Config() *ZMQ4Config

NewZMQ4Config returns nil.

Source Files

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