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Documentation

Index

• func LatencyTestWithChan(addrs []string, c chan<- Result, loops int, gos int, retry bool, ...) error
• type Result
• type Results
  • func LatencyTest(addrs []string, loops int, retry bool, gos int, timeout time.Duration, ...) (rets Results, err error)
  • func (r Results) Len() int
  • func (r Results) Less(i, j int) bool
  • func (r Results) SortByDuration()
  • func (r Results) Swap(i, j int)

Functions

func LatencyTestWithChan

func LatencyTestWithChan(addrs []string, c chan<- Result, loops int, gos int, retry bool, timeout time.Duration, names ...string) error

LatencyTestWithChan test latency between remote and local, and store valid remote's index in c the faster the less for remote's index

if you do not want a result which sored ,this is better

Args: addrs -> []string{"www.bing.com","192.168.12.1"} c -> store result for goroutine loops -> ping times gos -> concurrency numbers retry -> wheather try to use net.Dial to test latency after ping failed timeout -> timeout for ping and net.Dial names -> [optional] url's name exist a map relation

this is based on icmp protocl, requiring to run as privileged otherwise block

Types

type Result

type Result struct {
	//Name is mirror in eng short
	Name string
	//Address is IP or domain
	Address string
	//Latency in ms
	Latency time.Duration
	//Ping if remote can be ping successfuly
	Ping bool
	//Error for invalid remote host
	Error error
}

Result is just result

type Results

type Results []Result

Results for results

func LatencyTest

func LatencyTest(addrs []string, loops int, retry bool, gos int, timeout time.Duration, names ...string) (rets Results, err error)

LatencyTest test latency between remote and local, and store valid remote's index in c tresult are stored in rets,the faster remote host the less index are

Args: addrs -> []string{"www.bing.com","192.168.12.1"} loops -> ping times retry -> wheather try to use net.Dial to test latency after ping failed gos -> concurrency numbers timeout -> timeout for ping and net.Dial names -> [optional] url's name exist a map relation

for improving efficiency to use LatencyTestWithChan in goroutine instead of this but this provide a sort method(Results.SortByDuration) This is based on icmp protocl, requiring to run as privileged otherwise block

func (Results) Len

func (r Results) Len() int

implement sort.Interface interface

func (Results) Less

func (r Results) Less(i, j int) bool

func (Results) SortByDuration

func (r Results) SortByDuration()

SortByDuration just sort follow duration Using insert sort

func (Results) Swap

func (r Results) Swap(i, j int)