Seth Hoenig 435c0d9fc8 deps: Switch to Go modules for dependency management

This PR switches the Nomad repository from using govendor to Go modules
for managing dependencies. Aspects of the Nomad workflow remain pretty
much the same. The usual Makefile targets should continue to work as
they always did. The API submodule simply defers to the parent Nomad
version on the repository, keeping the semantics of API versioning that
currently exists.

2020-06-02 14:30:36 -05:00

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mdns

Simple mDNS client/server library in Golang. mDNS or Multicast DNS can be used to discover services on the local network without the use of an authoritative DNS server. This enables peer-to-peer discovery. It is important to note that many networks restrict the use of multicasting, which prevents mDNS from functioning. Notably, multicast cannot be used in any sort of cloud, or shared infrastructure environment. However it works well in most office, home, or private infrastructure environments.

Using the library is very simple, here is an example of publishing a service entry:

// Setup our service export
host, _ := os.Hostname()
info := []string{"My awesome service"},
service, _ := NewMDNSService(host, "_foobar._tcp", "", "", 8000, nil, info)

// Create the mDNS server, defer shutdown
server, _ := mdns.NewServer(&mdns.Config{Zone: service})
defer server.Shutdown()

Doing a lookup for service providers is also very simple:

// Make a channel for results and start listening
entriesCh := make(chan *mdns.ServiceEntry, 4)
go func() {
    for entry := range entriesCh {
        fmt.Printf("Got new entry: %v\n", entry)
    }
}()

// Start the lookup
mdns.Lookup("_foobar._tcp", entriesCh)
close(entriesCh)

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mdns

1.3 KiB

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