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latency.go
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latency.go
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package speedtest
import (
"time"
"strings"
"sort"
)
const DefaultLatencyMeasureTimes = 4
const DefaultErrorLatency = time.Hour
// Measures latencies for each server.
// Returns server list sorted by latencies.
// This is synchronous operation, because multiple simultaneous requests may affect results.
func (servers *Servers) MeasureLatencies(times uint, errorLatency time.Duration) *Servers {
first := true
for _, server := range servers.List {
if first {
first = false
server.client.Log("Measuring server latencies...")
}
server.doMeasureLatency(times, errorLatency)
}
latencies := &serverLatencies{List: make([]*Server, servers.Len())}
copy(latencies.List, servers.List)
sort.Sort(latencies)
return (*Servers)(latencies)
}
type serverLatencies Servers
func (servers *serverLatencies) Len() int {
return len(servers.List)
}
func (servers *serverLatencies) Less(i, j int) bool {
return servers.List[i].Latency < servers.List[j].Latency
}
func (servers *serverLatencies) Swap(i, j int) {
temp := servers.List[i]
servers.List[i] = servers.List[j]
servers.List[j] = temp;
}
func (server *Server) MeasureLatency(times uint, errorLatency time.Duration) time.Duration {
server.client.Log("Measuring server latency...\n")
return server.doMeasureLatency(times, errorLatency);
}
func (server *Server) doMeasureLatency(times uint, errorLatency time.Duration) time.Duration {
var results time.Duration = 0
var i uint
for i = 0; i < times; i++ {
results += server.measureLatency(errorLatency)
}
server.Latency = time.Duration(results / time.Duration(times))
return server.Latency
}
func (server *Server) measureLatency(errorLatency time.Duration) time.Duration {
url := server.RelativeURL("latency.txt")
start := time.Now()
resp, err := server.client.Get(url)
duration := time.Since(start);
if resp != nil {
url = resp.Request.URL.String()
}
if err != nil {
server.client.Log("[%s] Failed to detect latency: %v\n", url, err)
return errorLatency
}
if resp.StatusCode != 200 {
server.client.Log("[%s] Invalid latency detection HTTP status: %d\n", url, resp.StatusCode)
duration = errorLatency
}
content, err := resp.ReadContent()
if err != nil {
server.client.Log("[%s] Failed to read latency response: %v\n", url, err)
duration = errorLatency
}
if !strings.HasPrefix(string(content), "test=test") {
server.client.Log("[%s] Invalid latency response: %s\n", url, content)
duration = errorLatency
}
return duration
}