emqx4.3/rel/config/examples/exhook.conf.example

## gRPC Hook Extension
##
## Allows users to provide hook callbacks over gRPC for EMQX message lifecycle events.

exhook.servers = [
    {
        ## Name of the exhook server
        name = "server_1"

        ## Feature switch
        enable = false

        ## URL of gRPC server
        url = "http://127.0.0.1:9090"

        ## The timeout of request gRPC server
        request_timeout = 5s

        ## This value will be returned when the request to the gRPC server fails for any reason
        ## Type:
        ## - deny :: stop to execute this hook.
        ## - ignore :: continue to execute this hook
        failed_action = deny

        ## Interval of automatically reconnecting the gRPC server when the connection is broken
        ## Type:
        ## - false :: Never reconnect
        ## - Time Duration, e.g.15s, 10m, 1h :: Reconnecting Interval
        auto_reconnect = 60s

        ## The process pool size for gRPC client
        pool_size = 8

        ## Connection socket options
        socket_options {
            ## Whether periodic transmission on a connected socket when no other data is exchanged
            keepalive = true

            ## TCP_NODELAY switch
            nodelay = true

            ## The minimum size of receive buffer to use for the socket
            recbuf = "64KB"

            ## The minimum size of send buffer to use for the socket
            sndbuf = "16KB"
        }
    },
    {name = "server_2", url = "http://127.0.0.1:9091"}
]