in.ashwanthkumar.suuchi.router.Headers.scala Maven / Gradle / Ivy

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package in.ashwanthkumar.suuchi.router

import io.grpc.{Context, Metadata}

object Headers {
  val ELIGIBLE_NODES      = "eligible_nodes"
  val PRIMARY_NODE        = "primary_node"
  val REPLICATION_REQUEST = "replication_request"
  val BROADCAST_REQUEST   = "broadcast_request"

  val REPLICATION_REQUEST_KEY = Metadata.Key.of(Headers.REPLICATION_REQUEST, StringMarshaller)

  /**
   * Context Key that's set to true if the node is processing a replication request is the primary node.
   * You might want to use this information
   *   - to avoid doing double counts etc.
   *   - to do certain tasks that should happen only at the primary replica etc.
   */
  val PRIMARY_NODE_REQUEST_CTX: Context.Key[Boolean] =
    Context.keyWithDefault(Headers.PRIMARY_NODE, false)

  val ELIGIBLE_NODES_KEY    = Metadata.Key.of(Headers.ELIGIBLE_NODES, ListOfMemberAddressMarshaller)
  val PRIMARY_NODE_KEY      = Metadata.Key.of(Headers.PRIMARY_NODE, MemberAddressMarshaller)
  val BROADCAST_REQUEST_KEY = Metadata.Key.of(Headers.BROADCAST_REQUEST, BooleanMarshaller)
}