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server.go
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server.go
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package speedtest
import (
"errors"
"sort"
"fmt"
"time"
"net/url"
"log"
)
type ServerID uint64
type Server struct {
Coordinates
URL string `xml:"url,attr"`
Name string `xml:"name,attr"`
Country string `xml:"country,attr"`
CC string `xml:"cc,attr"`
Sponsor string `xml:"sponsor,attr"`
ID ServerID `xml:"id,attr"`
URL2 string `xml:"url2,attr"`
Host string `xml:"host,attr"`
client Client `xml:"-"`
Distance float64 `xml:"-"`
Latency time.Duration `xml:"-"`
}
func (s *Server) String() string {
return fmt.Sprintf("%8d: %s (%s, %s) [%.2f km] %s", s.ID, s.Sponsor, s.Name, s.Country, s.Distance, s.URL)
}
func (s *Server) RelativeURL(local string) string {
u, err := url.Parse(s.URL)
if err != nil {
log.Fatalf("[%s] Failed to parse server URL: %v\n", s.URL, err)
return ""
}
localURL, err := url.Parse(local)
if err != nil {
log.Fatalf("Failed to parse local URL `%s`: %v\n", local, err);
}
return u.ResolveReference(localURL).String()
}
type Servers struct {
List []*Server `xml:"servers>server"`
}
type ServersRef struct {
Servers *Servers
Error error
}
func (servers *Servers) First() *Server {
if len(servers.List) == 0 {
return nil
}
return servers.List[0]
}
func (servers *Servers) Find(id ServerID) *Server {
for _, server := range servers.List {
if server.ID == id {
return server
}
}
return nil;
}
func (servers *Servers) Len() int {
return len(servers.List)
}
func (servers *Servers) Less(i, j int) bool {
server1 := servers.List[i]
server2 := servers.List[j]
if server1.ID == server2.ID {
return false;
}
if server1.Distance < server2.Distance {
return true;
}
if server1.Distance > server2.Distance {
return false
}
return server1.ID < server2.ID
}
func (servers *Servers) Swap(i, j int) {
temp := servers.List[i]
servers.List[i] = servers.List[j]
servers.List[j] = temp;
}
func (servers *Servers) truncate(max int) *Servers {
size := servers.Len()
if size <= max {
return servers;
}
return &Servers{servers.List[:max]}
}
func (servers *Servers) String() string {
out := ""
for _, server := range servers.List {
out += server.String() + "\n"
}
return out
}
func (servers *Servers) append(other *Servers) *Servers {
if servers == nil {
return other
}
servers.List = append(servers.List, other.List...)
return servers
}
func (servers *Servers) sort(client Client, config *Config) {
for _, server := range servers.List {
server.client = client;
server.Distance = server.DistanceTo(config.Client.Coordinates)
}
sort.Sort(servers)
}
func (servers *Servers) deduplicate() {
dedup := make([]*Server, 0, len(servers.List));
var prevId ServerID = 0;
for _, server := range servers.List {
if prevId != server.ID {
prevId = server.ID
dedup = append(dedup, server);
}
}
servers.List = dedup
}
var serverURLs = [...]string{
"://www.speedtest.net/speedtest-servers-static.php",
"://c.speedtest.net/speedtest-servers-static.php",
"://www.speedtest.net/speedtest-servers.php",
"://c.speedtest.net/speedtest-servers.php",
}
var NoServersError error = errors.New("No servers available")
func (client *client) AllServers() (*Servers, error) {
serversChan := make(chan ServersRef)
client.LoadAllServers(serversChan)
serversRef := <-serversChan
return serversRef.Servers, serversRef.Error
}
func (client *client) LoadAllServers(ret chan ServersRef) {
client.mutex.Lock()
defer client.mutex.Unlock()
if client.allServers == nil {
client.allServers = make(chan ServersRef)
go client.loadServers()
}
go func() {
result := <-client.allServers
ret <- result
client.allServers <- result// Make it available again
}()
}
func (client *client) loadServers() {
configChan := make(chan ConfigRef)
client.LoadConfig(configChan);
client.Log("Retrieving speedtest.net server list...")
serversChan := make(chan *Servers, len(serverURLs))
for _, url := range serverURLs {
go client.loadServersFrom(url, serversChan)
}
var servers *Servers
for range serverURLs {
servers = servers.append(<-serversChan);
}
result := ServersRef{}
if servers.Len() == 0 {
result.Error = NoServersError
} else {
configRef := <-configChan
if configRef.Error != nil {
result.Error = configRef.Error
} else {
servers.sort(client, configRef.Config)
servers.deduplicate()
result.Servers = servers
}
}
client.allServers <- result
}
func (client *client) loadServersFrom(url string, ret chan *Servers) {
resp, err := client.Get(url)
if resp != nil {
url = resp.Request.URL.String()
}
if err != nil {
client.Log("[%s] Failed to retrieve server list: %v", url, err)
}
servers := &Servers{}
if err = resp.ReadXML(servers); err != nil {
client.Log("[%s] Failed to read server list: %v", url, err)
}
ret <- servers
}
func (client *client) ClosestServers() (*Servers, error) {
serversChan := make(chan ServersRef)
client.LoadClosestServers(serversChan)
serversRef := <-serversChan
return serversRef.Servers, serversRef.Error
}
func (client *client) LoadClosestServers(ret chan ServersRef) {
client.mutex.Lock()
defer client.mutex.Unlock()
if client.closestServers == nil {
client.closestServers = make(chan ServersRef)
go client.loadClosestServers()
}
go func() {
result := <-client.closestServers
ret <- result
client.closestServers <- result// Make it available again
}()
}
func (client *client) loadClosestServers() {
serversChan := make(chan ServersRef)
client.LoadAllServers(serversChan)
serversRef := <-serversChan
if serversRef.Error != nil {
client.closestServers <- serversRef
} else {
client.closestServers <- ServersRef{serversRef.Servers.truncate(5), nil}
}
}