A server is not normally disabled, but in the event of an RPC error, we want to mark a server as down to allow for fast failover to a different server. This value must be an int in order to support atomic operations.
Additionally, this is the preliminary work required to bring up a server in a disabled state. RPC health checks in the future could mark the server as alive, thereby creating an organic "slow start" feature for Consul.
Consolidate code duplication and tests into a single lib package. Most of these functions were from various **/util.go functions that couldn't be imported due to cyclic imports. The consul/lib package is intended to be a terminal node in an import DAG and a place to stash various consul-only helper functions. Pulled in hashicorp/go-uuid instead of consolidating UUID access.
This allows for us to automatically bootstrap a cluster of nodes after
'n' number of server nodes join. All servers must have the same 'n' set, or
they will fail to join the cluster; all servers will not join the peer set
until they hit 'n' server nodes.
If the raft commit index is not empty, '-expect=n' does nothing because it
thinks you've already bootstrapped.
Signed-off-by: Robert Xu <robxu9@gmail.com>
Sean Chittenden