// Bootstrap starts communication for this Ringpop instance.
//
// When Bootstrap is called, this Ringpop instance will attempt to contact
// other instances from a seed list provided either in the BootstrapOptions or
// as a JSON file.
//
// If no seed hosts are provided, a single-node cluster will be created.
func (rp *Ringpop) Bootstrap(userBootstrapOpts *swim.BootstrapOptions) ([]string, error) {
if rp.getState() < initialized {
err := rp.init()
if err != nil {
return nil, err
}
}
identity, err := rp.identity()
if err != nil {
return nil, err
}
// If the user has provided a list of hosts (and not a bootstrap file),
// check we're in the bootstrap host list and add ourselves if we're not
// there. If the host list is empty, this will create a single-node
// cluster.
bootstrapOpts := *userBootstrapOpts
if len(bootstrapOpts.File) == 0 && !util.StringInSlice(bootstrapOpts.Hosts, identity) {
bootstrapOpts.Hosts = append(bootstrapOpts.Hosts, identity)
}
joined, err := rp.node.Bootstrap(&bootstrapOpts)
if err != nil {
rp.logger.WithField("error", err).Info("bootstrap failed")
rp.setState(initialized)
return nil, err
}
rp.setState(ready)
rp.logger.WithField("joined", joined).Info("bootstrap complete")
return joined, nil
}
// potential nodes are nodes that can be joined that are not the local node
func (j *joinSender) CollectPotentialNodes(nodesJoined []string) []string {
if nodesJoined == nil {
nodesJoined = make([]string, 0)
}
var potentialNodes []string
for _, hostports := range j.bootstrapHostsMap {
for _, hostport := range hostports {
if j.node.address != hostport && !util.StringInSlice(nodesJoined, hostport) {
potentialNodes = append(potentialNodes, hostport)
}
}
}
return potentialNodes
}