amqp

package module
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 Go to latest Published: Nov 27, 2019 License: MIT Imports: 20 Imported by: 100

README

pack.ag/amqp

Go Report Card Coverage Status Build Status GoDoc MIT licensed

pack.ag/amqp is an AMQP 1.0 client implementation for Go.

AMQP 1.0 is not compatible with AMQP 0-9-1 or 0-10, which are the most common AMQP protocols in use today. A list of AMQP 1.0 brokers and other AMQP 1.0 resources can be found at github.com/xinchen10/awesome-amqp.

This library aims to be stable and worthy of production usage, but the API is still subject to change. To conform with SemVer, the major version will remain 0 until the API is deemed stable. During this period breaking changes will be indicated by bumping the minor version. Non-breaking changes will bump the patch version.

Install

go get -u pack.ag/amqp

Contributing

Contributions are welcome! Please see CONTRIBUTING.md.

Example Usage

package main

import (
	"context"
	"fmt"
	"log"
	"time"

	"pack.ag/amqp"
)

func main() {
	// Create client
	client, err := amqp.Dial("amqps://my-namespace.servicebus.windows.net",
		amqp.ConnSASLPlain("access-key-name", "access-key"),
	)
	if err != nil {
		log.Fatal("Dialing AMQP server:", err)
	}
	defer client.Close()

	// Open a session
	session, err := client.NewSession()
	if err != nil {
		log.Fatal("Creating AMQP session:", err)
	}

	ctx := context.Background()

	// Send a message
	{
		// Create a sender
		sender, err := session.NewSender(
			amqp.LinkTargetAddress("/queue-name"),
		)
		if err != nil {
			log.Fatal("Creating sender link:", err)
		}

		ctx, cancel := context.WithTimeout(ctx, 5*time.Second)

		// Send message
		err = sender.Send(ctx, amqp.NewMessage([]byte("Hello!")))
		if err != nil {
			log.Fatal("Sending message:", err)
		}

		sender.Close(ctx)
		cancel()
	}

	// Continuously read messages
	{
		// Create a receiver
		receiver, err := session.NewReceiver(
			amqp.LinkSourceAddress("/queue-name"),
			amqp.LinkCredit(10),
		)
		if err != nil {
			log.Fatal("Creating receiver link:", err)
		}
		defer func() {
			ctx, cancel := context.WithTimeout(ctx, 1*time.Second)
			receiver.Close(ctx)
			cancel()
		}()

		for {
			// Receive next message
			msg, err := receiver.Receive(ctx)
			if err != nil {
				log.Fatal("Reading message from AMQP:", err)
			}

			// Accept message
			msg.Accept()

			fmt.Printf("Message received: %s\n", msg.GetData())
		}
	}
}
Project Description
github.com/Azure/azure-event-hubs-go * Library for interacting with Microsoft Azure Event Hubs.
github.com/Azure/azure-service-bus-go * Library for interacting with Microsoft Azure Service Bus.
gocloud.dev/pubsub * Library for portably interacting with Pub/Sub systems.
qpid-proton AMQP 1.0 library using the Qpid Proton C bindings.

* indicates that the project uses this library.

Feel free to send PRs adding additional projects. Listed projects are not limited to those that use this library as long as they are potentially useful to people who are looking at an AMQP library.

Other Notes

By default, this package depends only on the standard library. Building with the pkgerrors tag will cause errors to be created/wrapped by the github.com/pkg/errors library. This can be useful for debugging and when used in a project using github.com/pkg/errors.

Documentation

Overview

Package amqp provides an AMQP 1.0 client implementation.

AMQP 1.0 is not compatible with AMQP 0-9-1 or 0-10, which are the most common AMQP protocols in use today.

The example below shows how to use this package to connect to a Microsoft Azure Service Bus queue.

Example 
package main

import (
	"context"
	"fmt"
	"log"
	"time"

	"pack.ag/amqp"
)

func main() {
	// Create client
	client, err := amqp.Dial("amqps://my-namespace.servicebus.windows.net",
		amqp.ConnSASLPlain("access-key-name", "access-key"),
	)
	if err != nil {
		log.Fatal("Dialing AMQP server:", err)
	}
	defer client.Close()

	// Open a session
	session, err := client.NewSession()
	if err != nil {
		log.Fatal("Creating AMQP session:", err)
	}

	ctx := context.Background()

	// Send a message
	{
		// Create a sender
		sender, err := session.NewSender(
			amqp.LinkTargetAddress("/queue-name"),
		)
		if err != nil {
			log.Fatal("Creating sender link:", err)
		}

		ctx, cancel := context.WithTimeout(ctx, 5*time.Second)

		// Send message
		err = sender.Send(ctx, amqp.NewMessage([]byte("Hello!")))
		if err != nil {
			log.Fatal("Sending message:", err)
		}

		sender.Close(ctx)
		cancel()
	}

	// Continuously read messages
	{
		// Create a receiver
		receiver, err := session.NewReceiver(
			amqp.LinkSourceAddress("/queue-name"),
			amqp.LinkCredit(10),
		)
		if err != nil {
			log.Fatal("Creating receiver link:", err)
		}
		defer func() {
			ctx, cancel := context.WithTimeout(ctx, 1*time.Second)
			receiver.Close(ctx)
			cancel()
		}()

		for {
			// Receive next message
			msg, err := receiver.Receive(ctx)
			if err != nil {
				log.Fatal("Reading message from AMQP:", err)
			}

			// Accept message
			msg.Accept()

			fmt.Printf("Message received: %s\n", msg.GetData())
		}
	}
}

Output:

Index

Examples

Constants

View Source 
const (
	DefaultMaxLinks = 4294967296
	DefaultWindow   = 100
)

Default session options

View Source 
const (
	DefaultLinkCredit      = 1
	DefaultLinkBatching    = false
	DefaultLinkBatchMaxAge = 5 * time.Second
)

Default link options

View Source 
const (
	DefaultIdleTimeout  = 1 * time.Minute
	DefaultMaxFrameSize = 512
	DefaultMaxSessions  = 65536
)

Default connection options

Variables

View Source 
var (
	// ErrSessionClosed is propagated to Sender/Receivers
	// when Session.Close() is called.
	ErrSessionClosed = errors.New("amqp: session closed")

	// ErrLinkClosed returned by send and receive operations when
	// Sender.Close() or Receiver.Close() are called.
	ErrLinkClosed = errors.New("amqp: link closed")
)
View Source 
var (
	ErrTimeout = errors.New("amqp: timeout waiting for response")

	// ErrConnClosed is propagated to Session and Senders/Receivers
	// when Client.Close() is called or the server closes the connection
	// without specifying an error.
	ErrConnClosed = errors.New("amqp: connection closed")
)

Errors

Functions

This section is empty.

Types

type Annotations added in v0.4.0 

type Annotations map[interface{}]interface{}

Annotations keys must be of type string, int, or int64.

String keys are encoded as AMQP Symbols.

type ArrayUByte added in v0.4.0 

type ArrayUByte []uint8

ArrayUByte allows encoding []uint8/[]byte as an array rather than binary data.

type Client 

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

Client is an AMQP client connection.

func Dial 

func Dial(addr string, opts ...ConnOption) (*Client, error)

Dial connects to an AMQP server.

If the addr includes a scheme, it must be "amqp" or "amqps". If no port is provided, 5672 will be used for "amqp" and 5671 for "amqps".

If username and password information is not empty it's used as SASL PLAIN credentials, equal to passing ConnSASLPlain option.

func New 

func New(conn net.Conn, opts ...ConnOption) (*Client, error)

New establishes an AMQP client connection over conn.

func (*Client) Close 

func (c *Client) Close() error

Close disconnects the connection.

func (*Client) NewSession 

func (c *Client) NewSession(opts ...SessionOption) (*Session, error)

NewSession opens a new AMQP session to the server.

type ConnOption 

type ConnOption func(*conn) error

ConnOption is a function for configuring an AMQP connection.

func ConnConnectTimeout 

func ConnConnectTimeout(d time.Duration) ConnOption

ConnConnectTimeout configures how long to wait for the server during connection establishment.

Once the connection has been established, ConnIdleTimeout applies. If duration is zero, no timeout will be applied.

Default: 0.

func ConnContainerID added in v0.7.1 

func ConnContainerID(id string) ConnOption

ConnContainerID sets the container-id to use when opening the connection.

A container ID will be randomly generated if this option is not used.

func ConnIdleTimeout 

func ConnIdleTimeout(d time.Duration) ConnOption

ConnIdleTimeout specifies the maximum period between receiving frames from the peer.

Resolution is milliseconds. A value of zero indicates no timeout. This setting is in addition to TCP keepalives.

Default: 1 minute.

func ConnMaxFrameSize 

func ConnMaxFrameSize(n uint32) ConnOption

ConnMaxFrameSize sets the maximum frame size that the connection will accept.

Must be 512 or greater.

Default: 512.

func ConnMaxSessions added in v0.4.0 

func ConnMaxSessions(n int) ConnOption

ConnMaxSessions sets the maximum number of channels.

n must be in the range 1 to 65536.

Default: 65536.

func ConnProperty added in v0.4.0 

func ConnProperty(key, value string) ConnOption

ConnProperty sets an entry in the connection properties map sent to the server.

This option can be used multiple times.

func ConnSASLAnonymous added in v0.2.0 

func ConnSASLAnonymous() ConnOption

ConnSASLAnonymous enables SASL ANONYMOUS authentication for the connection.

func ConnSASLPlain 

func ConnSASLPlain(username, password string) ConnOption

ConnSASLPlain enables SASL PLAIN authentication for the connection.

SASL PLAIN transmits credentials in plain text and should only be used on TLS/SSL enabled connection.

func ConnServerHostname 

func ConnServerHostname(hostname string) ConnOption

ConnServerHostname sets the hostname sent in the AMQP Open frame and TLS ServerName (if not otherwise set).

This is useful when the AMQP connection will be established via a pre-established TLS connection as the server may not know which hostname the client is attempting to connect to.

func ConnTLS 

func ConnTLS(enable bool) ConnOption

ConnTLS toggles TLS negotiation.

Default: false.

func ConnTLSConfig 

func ConnTLSConfig(tc *tls.Config) ConnOption

ConnTLSConfig sets the tls.Config to be used during TLS negotiation.

This option is for advanced usage, in most scenarios providing a URL scheme of "amqps://" or ConnTLS(true) is sufficient.

type DetachError added in v0.2.0 

type DetachError struct {
	RemoteError *Error
}

DetachError is returned by a link (Receiver/Sender) when a detach frame is received.

RemoteError will be nil if the link was detached gracefully.

func (*DetachError) Error added in v0.2.0 

func (e *DetachError) Error() string

type Durability added in v0.9.1 

type Durability uint32

Durability specifies the durability of a link. 

const (
	// No terminus state is retained durably.
	DurabilityNone Durability = 0

	// Only the existence and configuration of the terminus is
	// retained durably.
	DurabilityConfiguration Durability = 1

	// In addition to the existence and configuration of the
	// terminus, the unsettled state for durable messages is
	// retained durably.
	DurabilityUnsettledState Durability = 2
)

Durability Policies

func (*Durability) String added in v0.9.1 

func (d *Durability) String() string

type Error 

type Error struct {
	// A symbolic value indicating the error condition.
	Condition ErrorCondition

	// descriptive text about the error condition
	//
	// This text supplies any supplementary details not indicated by the condition field.
	// This text can be logged as an aid to resolving issues.
	Description string

	// map carrying information about the error condition
	Info map[string]interface{}
}

Error is an AMQP error.

func (*Error) Error added in v0.4.1 

func (e *Error) Error() string

func (*Error) String added in v0.2.0 

func (e *Error) String() string

type ErrorCondition 

type ErrorCondition string

ErrorCondition is one of the error conditions defined in the AMQP spec. 

const (
	// AMQP Errors
	ErrorInternalError         ErrorCondition = "amqp:internal-error"
	ErrorNotFound              ErrorCondition = "amqp:not-found"
	ErrorUnauthorizedAccess    ErrorCondition = "amqp:unauthorized-access"
	ErrorDecodeError           ErrorCondition = "amqp:decode-error"
	ErrorResourceLimitExceeded ErrorCondition = "amqp:resource-limit-exceeded"
	ErrorNotAllowed            ErrorCondition = "amqp:not-allowed"
	ErrorInvalidField          ErrorCondition = "amqp:invalid-field"
	ErrorNotImplemented        ErrorCondition = "amqp:not-implemented"
	ErrorResourceLocked        ErrorCondition = "amqp:resource-locked"
	ErrorPreconditionFailed    ErrorCondition = "amqp:precondition-failed"
	ErrorResourceDeleted       ErrorCondition = "amqp:resource-deleted"
	ErrorIllegalState          ErrorCondition = "amqp:illegal-state"
	ErrorFrameSizeTooSmall     ErrorCondition = "amqp:frame-size-too-small"

	// Connection Errors
	ErrorConnectionForced   ErrorCondition = "amqp:connection:forced"
	ErrorFramingError       ErrorCondition = "amqp:connection:framing-error"
	ErrorConnectionRedirect ErrorCondition = "amqp:connection:redirect"

	// Session Errors
	ErrorWindowViolation  ErrorCondition = "amqp:session:window-violation"
	ErrorErrantLink       ErrorCondition = "amqp:session:errant-link"
	ErrorHandleInUse      ErrorCondition = "amqp:session:handle-in-use"
	ErrorUnattachedHandle ErrorCondition = "amqp:session:unattached-handle"

	// Link Errors
	ErrorDetachForced          ErrorCondition = "amqp:link:detach-forced"
	ErrorTransferLimitExceeded ErrorCondition = "amqp:link:transfer-limit-exceeded"
	ErrorMessageSizeExceeded   ErrorCondition = "amqp:link:message-size-exceeded"
	ErrorLinkRedirect          ErrorCondition = "amqp:link:redirect"
	ErrorStolen                ErrorCondition = "amqp:link:stolen"
)

Error Conditions

type ExpiryPolicy added in v0.9.1 

type ExpiryPolicy symbol

ExpiryPolicy specifies when the expiry timer of a terminus starts counting down from the timeout value.

If the link is subsequently re-attached before the terminus is expired, then the count down is aborted. If the conditions for the terminus-expiry-policy are subsequently re-met, the expiry timer restarts from its originally configured timeout value. 

const (
	// The expiry timer starts when terminus is detached.
	ExpiryLinkDetach ExpiryPolicy = "link-detach"

	// The expiry timer starts when the most recently
	// associated session is ended.
	ExpirySessionEnd ExpiryPolicy = "session-end"

	// The expiry timer starts when most recently associated
	// connection is closed.
	ExpiryConnectionClose ExpiryPolicy = "connection-close"

	// The terminus never expires.
	ExpiryNever ExpiryPolicy = "never"
)

Expiry Policies

func (*ExpiryPolicy) String added in v0.9.1 

func (e *ExpiryPolicy) String() string

type LinkOption 

type LinkOption func(*link) error

LinkOption is a function for configuring an AMQP link.

A link may be a Sender or a Receiver.

func LinkAddress deprecated added in v0.2.0 

func LinkAddress(source string) LinkOption

LinkAddress sets the link address.

For a Receiver this configures the source address. For a Sender this configures the target address.

Deprecated: use LinkSourceAddress or LinkTargetAddress instead.

func LinkAddressDynamic added in v0.2.0 

func LinkAddressDynamic() LinkOption

LinkAddressDynamic requests a dynamically created address from the server.

func LinkBatchMaxAge 

func LinkBatchMaxAge(d time.Duration) LinkOption

LinkBatchMaxAge sets the maximum time between the start of a disposition batch and sending the batch to the server.

func LinkBatching 

func LinkBatching(enable bool) LinkOption

LinkBatching toggles batching of message disposition.

When enabled, accepting a message does not send the disposition to the server until the batch is equal to link credit or the batch max age expires.

func LinkCredit 

func LinkCredit(credit uint32) LinkOption

LinkCredit specifies the maximum number of unacknowledged messages the sender can transmit.

func LinkMaxMessageSize added in v0.4.2 

func LinkMaxMessageSize(size uint64) LinkOption

LinkMaxMessageSize sets the maximum message size that can be sent or received on the link.

A size of zero indicates no limit.

Default: 0.

func LinkName added in v0.9.1 

func LinkName(name string) LinkOption

LinkName sets the name of the link.

The link names must be unique per-connection.

Default: randomly generated.

func LinkProperty added in v0.4.1 

func LinkProperty(key, value string) LinkOption

LinkProperty sets an entry in the link properties map sent to the server.

This option can be used multiple times.

func LinkPropertyInt64 added in v0.4.1 

func LinkPropertyInt64(key string, value int64) LinkOption

LinkPropertyInt64 sets an entry in the link properties map sent to the server.

This option can be used multiple times.

func LinkReceiverSettle added in v0.2.0 

func LinkReceiverSettle(mode ReceiverSettleMode) LinkOption

LinkReceiverSettle sets the requested receiver settlement mode.

If a settlement mode is explicitly set and the server does not honor it an error will be returned during link attachment.

Default: Accept the settlement mode set by the server, commonly ModeFirst.

func LinkSelectorFilter added in v0.3.0 

func LinkSelectorFilter(filter string) LinkOption

LinkSelectorFilter sets a selector filter (apache.org:selector-filter:string) on the link source.

func LinkSenderSettle added in v0.2.0 

func LinkSenderSettle(mode SenderSettleMode) LinkOption

LinkSenderSettle sets the requested sender settlement mode.

If a settlement mode is explicitly set and the server does not honor it an error will be returned during link attachment.

Default: Accept the settlement mode set by the server, commonly ModeMixed.

func LinkSourceAddress added in v0.4.0 

func LinkSourceAddress(addr string) LinkOption

LinkSourceAddress sets the source address.

func LinkSourceCapabilities added in v0.9.1 

func LinkSourceCapabilities(capabilities ...string) LinkOption

LinkSourceCapabilities sets the source capabilities.

func LinkSourceDurability added in v0.9.1 

func LinkSourceDurability(d Durability) LinkOption

LinkSourceDurability sets the source durability policy.

Default: DurabilityNone.

func LinkSourceExpiryPolicy added in v0.9.1 

func LinkSourceExpiryPolicy(p ExpiryPolicy) LinkOption

LinkSourceExpiryPolicy sets the link expiration policy.

Default: ExpirySessionEnd.

func LinkSourceFilter added in v0.10.0 

func LinkSourceFilter(name string, code uint64, value interface{}) LinkOption

LinkSourceFilter is an advanced API for setting non-standard source filters. Please file an issue or open a PR if a standard filter is missing from this library.

The name is the key for the filter map. It will be encoded as an AMQP symbol type.

The code is the descriptor of the described type value. The domain-id and descriptor-id should be concatenated together. If 0 is passed as the code, the name will be used as the descriptor.

The value is the value of the descriped types. Acceptable types for value are specific to the filter.

Example:

The standard selector-filter is defined as: 

<descriptor name="apache.org:selector-filter:string" code="0x0000468C:0x00000004"/>

In this case the name is "apache.org:selector-filter:string" and the code is 0x0000468C00000004. 

LinkSourceFilter("apache.org:selector-filter:string", 0x0000468C00000004, exampleValue)

References: 

http://docs.oasis-open.org/amqp/core/v1.0/os/amqp-core-messaging-v1.0-os.html#type-filter-set
http://docs.oasis-open.org/amqp/core/v1.0/os/amqp-core-types-v1.0-os.html#section-descriptor-values

func LinkTargetAddress added in v0.4.0 

func LinkTargetAddress(addr string) LinkOption

LinkTargetAddress sets the target address.

func LinkTargetDurability added in v0.12.4 

func LinkTargetDurability(d Durability) LinkOption

LinkTargetDurability sets the target durability policy.

Default: DurabilityNone.

func LinkTargetExpiryPolicy added in v0.12.4 

func LinkTargetExpiryPolicy(p ExpiryPolicy) LinkOption

LinkTargetExpiryPolicy sets the link expiration policy.

Default: ExpirySessionEnd.

type Message 

type Message struct {
	// Message format code.
	//
	// The upper three octets of a message format code identify a particular message
	// format. The lowest octet indicates the version of said message format. Any
	// given version of a format is forwards compatible with all higher versions.
	Format uint32

	// The DeliveryTag can be up to 32 octets of binary data.
	DeliveryTag []byte

	// The header section carries standard delivery details about the transfer
	// of a message through the AMQP network.
	Header *MessageHeader

	// The delivery-annotations section is used for delivery-specific non-standard
	// properties at the head of the message. Delivery annotations convey information
	// from the sending peer to the receiving peer.
	DeliveryAnnotations Annotations

	// The message-annotations section is used for properties of the message which
	// are aimed at the infrastructure.
	Annotations Annotations

	// The properties section is used for a defined set of standard properties of
	// the message.
	Properties *MessageProperties

	// The application-properties section is a part of the bare message used for
	// structured application data. Intermediaries can use the data within this
	// structure for the purposes of filtering or routing.
	ApplicationProperties map[string]interface{}

	// Data payloads.
	Data [][]byte

	// Value payload.
	Value interface{}

	// The footer section is used for details about the message or delivery which
	// can only be calculated or evaluated once the whole bare message has been
	// constructed or seen (for example message hashes, HMACs, signatures and
	// encryption details).
	Footer Annotations

	// Mark the message as settled when LinkSenderSettle is ModeMixed.
	//
	// This field is ignored when LinkSenderSettle is not ModeMixed.
	SendSettled bool
	// contains filtered or unexported fields
}

Message is an AMQP message.

func NewMessage added in v0.4.0 

func NewMessage(data []byte) *Message

NewMessage returns a *Message with data as the payload.

This constructor is intended as a helper for basic Messages with a single data payload. It is valid to construct a Message directly for more complex usages.

func (*Message) Accept 

func (m *Message) Accept() error

Accept notifies the server that the message has been accepted and does not require redelivery.

func (*Message) GetData added in v0.4.0 

func (m *Message) GetData() []byte

GetData returns the first []byte from the Data field or nil if Data is empty.

func (*Message) MarshalBinary added in v0.4.1 

func (m *Message) MarshalBinary() ([]byte, error)

MarshalBinary encodes the message into binary form.

func (*Message) Modify added in v0.5.0 

func (m *Message) Modify(deliveryFailed, undeliverableHere bool, messageAnnotations Annotations) error

Modify notifies the server that the message was not acted upon and should be modifed.

deliveryFailed indicates that the server must consider this and unsuccessful delivery attempt and increment the delivery count.

undeliverableHere indicates that the server must not redeliver the message to this link.

messageAnnotations is an optional annotation map to be merged with the existing message annotations, overwriting existing keys if necessary.

func (*Message) Reject 

func (m *Message) Reject(e *Error) error

Reject notifies the server that the message is invalid.

Rejection error is optional.

func (*Message) Release 

func (m *Message) Release() error

Release releases the message back to the server. The message may be redelivered to this or another consumer.

func (*Message) UnmarshalBinary added in v0.10.1 

func (m *Message) UnmarshalBinary(data []byte) error

UnmarshalBinary decodes the message from binary form.

type MessageHeader 

type MessageHeader struct {
	Durable       bool
	Priority      uint8
	TTL           time.Duration // from milliseconds
	FirstAcquirer bool
	DeliveryCount uint32
}

MessageHeader carries standard delivery details about the transfer of a message.

type MessageProperties 

type MessageProperties struct {
	// Message-id, if set, uniquely identifies a message within the message system.
	// The message producer is usually responsible for setting the message-id in
	// such a way that it is assured to be globally unique. A broker MAY discard a
	// message as a duplicate if the value of the message-id matches that of a
	// previously received message sent to the same node.
	MessageID interface{} // uint64, UUID, []byte, or string

	// The identity of the user responsible for producing the message.
	// The client sets this value, and it MAY be authenticated by intermediaries.
	UserID []byte

	// The to field identifies the node that is the intended destination of the message.
	// On any given transfer this might not be the node at the receiving end of the link.
	To string

	// A common field for summary information about the message content and purpose.
	Subject string

	// The address of the node to send replies to.
	ReplyTo string

	// This is a client-specific id that can be used to mark or identify messages
	// between clients.
	CorrelationID interface{} // uint64, UUID, []byte, or string

	// The RFC-2046 [RFC2046] MIME type for the message's application-data section
	// (body). As per RFC-2046 [RFC2046] this can contain a charset parameter defining
	// the character encoding used: e.g., 'text/plain; charset="utf-8"'.
	//
	// For clarity, as per section 7.2.1 of RFC-2616 [RFC2616], where the content type
	// is unknown the content-type SHOULD NOT be set. This allows the recipient the
	// opportunity to determine the actual type. Where the section is known to be truly
	// opaque binary data, the content-type SHOULD be set to application/octet-stream.
	//
	// When using an application-data section with a section code other than data,
	// content-type SHOULD NOT be set.
	ContentType string

	// The content-encoding property is used as a modifier to the content-type.
	// When present, its value indicates what additional content encodings have been
	// applied to the application-data, and thus what decoding mechanisms need to be
	// applied in order to obtain the media-type referenced by the content-type header
	// field.
	//
	// Content-encoding is primarily used to allow a document to be compressed without
	// losing the identity of its underlying content type.
	//
	// Content-encodings are to be interpreted as per section 3.5 of RFC 2616 [RFC2616].
	// Valid content-encodings are registered at IANA [IANAHTTPPARAMS].
	//
	// The content-encoding MUST NOT be set when the application-data section is other
	// than data. The binary representation of all other application-data section types
	// is defined completely in terms of the AMQP type system.
	//
	// Implementations MUST NOT use the identity encoding. Instead, implementations
	// SHOULD NOT set this property. Implementations SHOULD NOT use the compress encoding,
	// except as to remain compatible with messages originally sent with other protocols,
	// e.g. HTTP or SMTP.
	//
	// Implementations SHOULD NOT specify multiple content-encoding values except as to
	// be compatible with messages originally sent with other protocols, e.g. HTTP or SMTP.
	ContentEncoding string

	// An absolute time when this message is considered to be expired.
	AbsoluteExpiryTime time.Time

	// An absolute time when this message was created.
	CreationTime time.Time

	// Identifies the group the message belongs to.
	GroupID string

	// The relative position of this message within its group.
	GroupSequence uint32 // RFC-1982 sequence number

	// This is a client-specific id that is used so that client can send replies to this
	// message to a specific group.
	ReplyToGroupID string
}

MessageProperties is the defined set of properties for AMQP messages.

type Receiver 

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

Receiver receives messages on a single AMQP link.

func (*Receiver) Address added in v0.2.0 

func (r *Receiver) Address() string

Address returns the link's address.

func (*Receiver) Close 

func (r *Receiver) Close(ctx context.Context) error

Close closes the Receiver and AMQP link.

If ctx expires while waiting for servers response, ctx.Err() will be returned. The session will continue to wait for the response until the Session or Client is closed.

func (*Receiver) Receive 

func (r *Receiver) Receive(ctx context.Context) (*Message, error)

Receive returns the next message from the sender.

Blocks until a message is received, ctx completes, or an error occurs.

type ReceiverSettleMode added in v0.2.0 

type ReceiverSettleMode uint8

ReceiverSettleMode specifies how the receiver will settle messages. 

const (
	// Receiver will spontaneously settle all incoming transfers.
	ModeFirst ReceiverSettleMode = 0

	// Receiver will only settle after sending the disposition to the
	// sender and receiving a disposition indicating settlement of
	// the delivery from the sender.
	ModeSecond ReceiverSettleMode = 1
)

Receiver Settlement Modes

func (*ReceiverSettleMode) String added in v0.2.0 

func (m *ReceiverSettleMode) String() string

type Sender added in v0.2.0 

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

Sender sends messages on a single AMQP link.

func (*Sender) Address added in v0.2.0 

func (s *Sender) Address() string

Address returns the link's address.

func (*Sender) Close added in v0.2.0 

func (s *Sender) Close(ctx context.Context) error

Close closes the Sender and AMQP link.

func (*Sender) Send added in v0.2.0 

func (s *Sender) Send(ctx context.Context, msg *Message) error

Send sends a Message.

Blocks until the message is sent, ctx completes, or an error occurs.

Send is safe for concurrent use. Since only a single message can be sent on a link at a time, this is most useful when settlement confirmation has been requested (receiver settle mode is "Second"). In this case, additional messages can be sent while the current goroutine is waiting for the confirmation.

type SenderSettleMode added in v0.2.0 

type SenderSettleMode uint8

SenderSettleMode specifies how the sender will settle messages. 

const (
	// Sender will send all deliveries initially unsettled to the receiver.
	ModeUnsettled SenderSettleMode = 0

	// Sender will send all deliveries settled to the receiver.
	ModeSettled SenderSettleMode = 1

	// Sender MAY send a mixture of settled and unsettled deliveries to the receiver.
	ModeMixed SenderSettleMode = 2
)

Sender Settlement Modes

func (*SenderSettleMode) String added in v0.2.0 

func (m *SenderSettleMode) String() string

type Session 

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

Session is an AMQP session.

A session multiplexes Receivers.

func (*Session) Close 

func (s *Session) Close(ctx context.Context) error

Close gracefully closes the session.

If ctx expires while waiting for servers response, ctx.Err() will be returned. The session will continue to wait for the response until the Client is closed.

func (*Session) NewReceiver 

func (s *Session) NewReceiver(opts ...LinkOption) (*Receiver, error)

NewReceiver opens a new receiver link on the session.

func (*Session) NewSender added in v0.2.0 

func (s *Session) NewSender(opts ...LinkOption) (*Sender, error)

NewSender opens a new sender link on the session.

type SessionOption added in v0.4.2 

type SessionOption func(*Session) error

SessionOption is an function for configuring an AMQP session.

func SessionIncomingWindow added in v0.4.2 

func SessionIncomingWindow(window uint32) SessionOption

SessionIncomingWindow sets the maximum number of unacknowledged transfer frames the server can send. 

func SessionMaxLinks(n int) SessionOption

SessionMaxLinks sets the maximum number of links (Senders/Receivers) allowed on the session.

n must be in the range 1 to 4294967296.

Default: 4294967296.

func SessionOutgoingWindow added in v0.4.2 

func SessionOutgoingWindow(window uint32) SessionOption

SessionOutgoingWindow sets the maximum number of unacknowledged transfer frames the client can send.

type UUID added in v0.2.0 

type UUID [16]byte

UUID is a 128 bit identifier as defined in RFC 4122.

func (UUID) String added in v0.2.0 

func (u UUID) String() string

String returns the hex encoded representation described in RFC 4122, Section 3.

Source Files

View all Source files

Directories

Path Synopsis
internal
testconn

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