//sets a new router table
// returns the old router table, or error
func (this *Manager) SetRouterTable(table *RouterTable) (*RouterTable, error) {
this.lock.Lock()
defer this.lock.Unlock()
if this.table != nil {
if this.table.Revision >= table.Revision {
return nil, fmt.Errorf("Trying to set an older revision %d vs %d", this.table.Revision, table.Revision)
}
}
//create a new map for connections
c := make(map[string]client.Client)
for _, e := range table.Entries {
key := e.Id()
if key == this.MyEntryId {
e.Self = true
table.MyEntry = e
continue
}
conn, ok := this.connections[key]
if !ok {
conn = this.createConnection(e)
}
delete(this.connections, key)
c[key] = conn
}
//now close any Clients for removed entries
for _, client := range this.connections {
client.Close()
}
oldTable := this.table
this.connections = c
this.table = table
this.save()
return oldTable, nil
}
// Creates a new manager. Uses the one or more seed urls to download the
// routing table.
func NewManagerSeed(partitioner Partitioner, serviceName, dataDir, myEntryId string, seedHttpUrls []string) (*Manager, error) {
//TODO: can we get the servicename from the routing table?
manager := NewManager(partitioner, serviceName, dataDir, myEntryId)
var err error
for _, url := range seedHttpUrls {
client := client.NewHttp(url)
tble, err := RequestRouterTable(client)
client.Close()
if err != nil {
//found a table.. woot
manager.SetRouterTable(tble)
return manager, nil
}
}
if manager.table != nil {
//uhh, I guess we sucessfully loaded it elsewhere
return manager, nil
}
//we still return the manager since it is usable just doesnt have a routing table.
return manager, err
}