com.gilt.util.net.dns

ServiceLookup

trait ServiceLookup extends AnyRef

A thin wrapper around http://www.dnsjava.org/ to make use of DNS SRV records for dynamic server/cluster configuration.

http://en.wikipedia.org/wiki/SRV_record http://tools.ietf.org/html/rfc2782

SRV record format: _service._proto.name. TTL class SRV priority weight port target.

service: the symbolic name of the desired service. proto: the transport protocol of the desired service; this is usually either TCP or UDP. name: the domain name for which this record is valid, ending in a dot. TTL: standard DNS time to live field. class: standard DNS class field (this is always IN). priority: the priority of the target host, lower value means more preferred. weight: A relative weight for records with the same priority. port: the TCP or UDP port on which the service is to be found. target: the canonical hostname of the machine providing the service, ending in a dot.

SRVRecord(Name name, int dclass, long ttl, int priority, int weight, int port, Name target)

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  1. abstract def lookup(serviceName: String, transportProtocol: TransportProtocol = TransportProtocol.TCP): Seq[ServiceRecord]

    Lookup service record(s).

    Lookup service record(s).

    E.g. given this /etc/resolv.conf search foo.bar.gilt.internal

    lookup("rabbitmq") will query for "_rabbitmq._tcp.foo.bar.gilt.internal." lookup("rabbitmq.some.app") will query for "_rabbitmq._tcp.some.app.foo.bar.gilt.internal."

    Default search paths will be ignored if name ends with '.'

    lookup("service.some.public.site.com.") will query for "_service._tcp.some.public.site.com."

    serviceName

    'canonical' name of a service or a service cluster

    transportProtocol

    TCP/UDP

    Exceptions thrown
    InvalidServiceNameExceptionServiceLookupException

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