Is amqp.Dial Thread-Safe for Connection Creation in Go? A Debate on Global vs. Per-Request Connections.

Thread Safety of amqp.Dial in Go Lang for Connection Creation

Creating TCP connections for AMQP can be an expensive operation. To address this, channels were introduced. However, discussions have arisen about whether to create a connection every time or to declare it globally once.

Question:

A recent example in the main() function of a Go application demonstrates the creation of a connection every time a message is published. This approach raises the question of whether it's more appropriate to have a globally declared connection with a failover mechanism in case of connection closures, especially considering the assumed thread-safe nature of amqp.Dial.

Answer:

It is not advisable to create a connection for every request. Instead, consider making the connection a global variable or part of an application context that is initialized only once at startup.

To handle connection errors, amqp.Connection.NotifyClose can be used to register a channel to monitor connection status. When an error occurs, the connection can be reestablished using a reconnect function.

Example:

<code class="go">import (
    "github.com/streadway/amqp"
)

func initialize() {
    c := make(chan *amqp.Error)
    go func() {
        err := <-c
        log.Println("reconnect: " + err.Error())
        initialize()
    }()

    conn, err := amqp.Dial("amqp://guest:guest@localhost:5672/")
    if err != nil {
        panic("cannot connect")
    }
    conn.NotifyClose(c)

    // create topology
}</code>

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