You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
259 lines
8.3 KiB
259 lines
8.3 KiB
package rabbitmq
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"sync"
|
|
|
|
amqp "github.com/rabbitmq/amqp091-go"
|
|
"github.com/wagslane/go-rabbitmq/internal/channelmanager"
|
|
"github.com/wagslane/go-rabbitmq/internal/connectionmanager"
|
|
)
|
|
|
|
// DeliveryMode. Transient means higher throughput but messages will not be
|
|
// restored on broker restart. The delivery mode of publishings is unrelated
|
|
// to the durability of the queues they reside on. Transient messages will
|
|
// not be restored to durable queues, persistent messages will be restored to
|
|
// durable queues and lost on non-durable queues during server restart.
|
|
//
|
|
// This remains typed as uint8 to match Publishing.DeliveryMode. Other
|
|
// delivery modes specific to custom queue implementations are not enumerated
|
|
// here.
|
|
const (
|
|
Transient uint8 = amqp.Transient
|
|
Persistent uint8 = amqp.Persistent
|
|
)
|
|
|
|
// Return captures a flattened struct of fields returned by the server when a
|
|
// Publishing is unable to be delivered either due to the `mandatory` flag set
|
|
// and no route found, or `immediate` flag set and no free consumer.
|
|
type Return struct {
|
|
amqp.Return
|
|
}
|
|
|
|
// Confirmation notifies the acknowledgment or negative acknowledgement of a publishing identified by its delivery tag.
|
|
// Use NotifyPublish to consume these events. ReconnectionCount is useful in that each time it increments, the DeliveryTag
|
|
// is reset to 0, meaning you can use ReconnectionCount+DeliveryTag to ensure uniqueness
|
|
type Confirmation struct {
|
|
amqp.Confirmation
|
|
ReconnectionCount int
|
|
}
|
|
|
|
// Publisher allows you to publish messages safely across an open connection
|
|
type Publisher struct {
|
|
chanManager *channelmanager.ChannelManager
|
|
connManager *connectionmanager.ConnectionManager
|
|
reconnectErrCh <-chan error
|
|
closeConnectionToManagerCh chan<- struct{}
|
|
|
|
disablePublishDueToFlow bool
|
|
disablePublishDueToFlowMux *sync.RWMutex
|
|
|
|
disablePublishDueToBlocked bool
|
|
disablePublishDueToBlockedMux *sync.RWMutex
|
|
|
|
handlerMux *sync.Mutex
|
|
notifyReturnHandler func(r Return)
|
|
notifyPublishHandler func(p Confirmation)
|
|
|
|
options PublisherOptions
|
|
}
|
|
|
|
// NewPublisher returns a new publisher with an open channel to the cluster.
|
|
// If you plan to enforce mandatory or immediate publishing, those failures will be reported
|
|
// on the channel of Returns that you should setup a listener on.
|
|
// Flow controls are automatically handled as they are sent from the server, and publishing
|
|
// will fail with an error when the server is requesting a slowdown
|
|
func NewPublisher(conn *Conn, optionFuncs ...func(*PublisherOptions)) (*Publisher, error) {
|
|
defaultOptions := getDefaultPublisherOptions()
|
|
options := &defaultOptions
|
|
for _, optionFunc := range optionFuncs {
|
|
optionFunc(options)
|
|
}
|
|
|
|
if conn.connectionManager == nil {
|
|
return nil, errors.New("connection manager can't be nil")
|
|
}
|
|
|
|
chanManager, err := channelmanager.NewChannelManager(conn.connectionManager, options.Logger, conn.connectionManager.ReconnectInterval)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
reconnectErrCh, closeCh := chanManager.NotifyReconnect()
|
|
publisher := &Publisher{
|
|
chanManager: chanManager,
|
|
connManager: conn.connectionManager,
|
|
reconnectErrCh: reconnectErrCh,
|
|
closeConnectionToManagerCh: closeCh,
|
|
disablePublishDueToFlow: false,
|
|
disablePublishDueToFlowMux: &sync.RWMutex{},
|
|
disablePublishDueToBlocked: false,
|
|
disablePublishDueToBlockedMux: &sync.RWMutex{},
|
|
handlerMux: &sync.Mutex{},
|
|
notifyReturnHandler: nil,
|
|
notifyPublishHandler: nil,
|
|
options: *options,
|
|
}
|
|
|
|
err = publisher.startup()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
go publisher.handleRestarts()
|
|
|
|
return publisher, nil
|
|
}
|
|
|
|
func (publisher *Publisher) startup() error {
|
|
err := declareExchange(publisher.chanManager, publisher.options.ExchangeOptions)
|
|
if err != nil {
|
|
return fmt.Errorf("declare exchange failed: %w", err)
|
|
}
|
|
go publisher.startNotifyFlowHandler()
|
|
go publisher.startNotifyBlockedHandler()
|
|
return nil
|
|
}
|
|
|
|
func (publisher *Publisher) handleRestarts() {
|
|
for err := range publisher.reconnectErrCh {
|
|
publisher.options.Logger.Infof("successful publisher recovery from: %v", err)
|
|
err := publisher.startup()
|
|
if err != nil {
|
|
publisher.options.Logger.Infof("failed to startup publisher: %v", err)
|
|
continue
|
|
}
|
|
go publisher.startReturnHandler()
|
|
go publisher.startPublishHandler()
|
|
}
|
|
}
|
|
|
|
// Publish publishes the provided data to the given routing keys over the connection
|
|
func (publisher *Publisher) Publish(
|
|
data []byte,
|
|
routingKeys []string,
|
|
optionFuncs ...func(*PublishOptions),
|
|
) error {
|
|
publisher.disablePublishDueToFlowMux.RLock()
|
|
defer publisher.disablePublishDueToFlowMux.RUnlock()
|
|
if publisher.disablePublishDueToFlow {
|
|
return fmt.Errorf("publishing blocked due to high flow on the server")
|
|
}
|
|
|
|
publisher.disablePublishDueToBlockedMux.RLock()
|
|
defer publisher.disablePublishDueToBlockedMux.RUnlock()
|
|
if publisher.disablePublishDueToBlocked {
|
|
return fmt.Errorf("publishing blocked due to TCP block on the server")
|
|
}
|
|
|
|
options := &PublishOptions{}
|
|
for _, optionFunc := range optionFuncs {
|
|
optionFunc(options)
|
|
}
|
|
if options.DeliveryMode == 0 {
|
|
options.DeliveryMode = Transient
|
|
}
|
|
|
|
for _, routingKey := range routingKeys {
|
|
var message = amqp.Publishing{}
|
|
message.ContentType = options.ContentType
|
|
message.DeliveryMode = options.DeliveryMode
|
|
message.Body = data
|
|
message.Headers = tableToAMQPTable(options.Headers)
|
|
message.Expiration = options.Expiration
|
|
message.ContentEncoding = options.ContentEncoding
|
|
message.Priority = options.Priority
|
|
message.CorrelationId = options.CorrelationID
|
|
message.ReplyTo = options.ReplyTo
|
|
message.MessageId = options.MessageID
|
|
message.Timestamp = options.Timestamp
|
|
message.Type = options.Type
|
|
message.UserId = options.UserID
|
|
message.AppId = options.AppID
|
|
|
|
// Actual publish.
|
|
err := publisher.chanManager.PublishSafe(
|
|
options.Exchange,
|
|
routingKey,
|
|
options.Mandatory,
|
|
options.Immediate,
|
|
message,
|
|
)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Close closes the publisher and releases resources
|
|
// The publisher should be discarded as it's not safe for re-use
|
|
// Only call Close() once
|
|
func (publisher *Publisher) Close() {
|
|
publisher.options.Logger.Infof("closing publisher...")
|
|
go func() {
|
|
publisher.closeConnectionToManagerCh <- struct{}{}
|
|
}()
|
|
}
|
|
|
|
// NotifyReturn registers a listener for basic.return methods.
|
|
// These can be sent from the server when a publish is undeliverable either from the mandatory or immediate flags.
|
|
// These notifications are shared across an entire connection, so if you're creating multiple
|
|
// publishers on the same connection keep that in mind
|
|
func (publisher *Publisher) NotifyReturn(handler func(r Return)) {
|
|
publisher.handlerMux.Lock()
|
|
start := publisher.notifyReturnHandler == nil
|
|
publisher.notifyReturnHandler = handler
|
|
publisher.handlerMux.Unlock()
|
|
|
|
if start {
|
|
go publisher.startReturnHandler()
|
|
}
|
|
}
|
|
|
|
// NotifyPublish registers a listener for publish confirmations, must set ConfirmPublishings option
|
|
// These notifications are shared across an entire connection, so if you're creating multiple
|
|
// publishers on the same connection keep that in mind
|
|
func (publisher *Publisher) NotifyPublish(handler func(p Confirmation)) {
|
|
publisher.handlerMux.Lock()
|
|
start := publisher.notifyPublishHandler == nil
|
|
publisher.notifyPublishHandler = handler
|
|
publisher.handlerMux.Unlock()
|
|
|
|
if start {
|
|
go publisher.startPublishHandler()
|
|
}
|
|
}
|
|
|
|
func (publisher *Publisher) startReturnHandler() {
|
|
publisher.handlerMux.Lock()
|
|
if publisher.notifyReturnHandler == nil {
|
|
publisher.handlerMux.Unlock()
|
|
return
|
|
}
|
|
publisher.handlerMux.Unlock()
|
|
|
|
returns := publisher.chanManager.NotifyReturnSafe(make(chan amqp.Return, 1))
|
|
for ret := range returns {
|
|
go publisher.notifyReturnHandler(Return{ret})
|
|
}
|
|
}
|
|
|
|
func (publisher *Publisher) startPublishHandler() {
|
|
publisher.handlerMux.Lock()
|
|
if publisher.notifyPublishHandler == nil {
|
|
publisher.handlerMux.Unlock()
|
|
return
|
|
}
|
|
publisher.handlerMux.Unlock()
|
|
|
|
publisher.chanManager.ConfirmSafe(false)
|
|
confirmationCh := publisher.chanManager.NotifyPublishSafe(make(chan amqp.Confirmation, 1))
|
|
for conf := range confirmationCh {
|
|
go publisher.notifyPublishHandler(Confirmation{
|
|
Confirmation: conf,
|
|
ReconnectionCount: int(publisher.chanManager.GetReconnectionCount()),
|
|
})
|
|
}
|
|
}
|