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