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package gocql
import "fmt"
// HostFilter interface is used when a host is discovered via server sent events.
type HostFilter interface {
// Called when a new host is discovered, returning true will cause the host
// to be added to the pools.
Accept(host *HostInfo) bool
}
// HostFilterFunc converts a func(host HostInfo) bool into a HostFilter
type HostFilterFunc func(host *HostInfo) bool
func (fn HostFilterFunc) Accept(host *HostInfo) bool {
return fn(host)
}
// AcceptAllFilter will accept all hosts
func AcceptAllFilter() HostFilter {
return HostFilterFunc(func(host *HostInfo) bool {
return true
})
}
func DenyAllFilter() HostFilter {
return HostFilterFunc(func(host *HostInfo) bool {
return false
})
}
// DataCentreHostFilter filters all hosts such that they are in the same data centre
// as the supplied data centre.
func DataCentreHostFilter(dataCentre string) HostFilter {
return HostFilterFunc(func(host *HostInfo) bool {
return host.DataCenter() == dataCentre
})
}
// WhiteListHostFilter filters incoming hosts by checking that their address is
// in the initial hosts whitelist.
func WhiteListHostFilter(hosts ...string) HostFilter {
hostInfos, err := addrsToHosts(hosts, 9042)
if err != nil {
// dont want to panic here, but rather not break the API
panic(fmt.Errorf("unable to lookup host info from address: %v", err))
}
m := make(map[string]bool, len(hostInfos))
for _, host := range hostInfos {
m[host.ConnectAddress().String()] = true
}
return HostFilterFunc(func(host *HostInfo) bool {
return m[host.ConnectAddress().String()]
})
}
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