forked from Meituan-Dianping/cat-go
/
router.go
231 lines (201 loc) · 4.84 KB
/
router.go
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package cat
import (
"encoding/json"
"encoding/xml"
"errors"
"fmt"
"io"
"io/ioutil"
"math"
"net"
"net/http"
"net/url"
"strconv"
"time"
)
type routerConfigXMLProperty struct {
XMLName xml.Name `xml:"property"`
Id string `xml:"id,attr"`
Value string `xml:"value,attr"`
}
type routerConfigXML struct {
XMLName xml.Name `xml:"property-config"`
Properties []routerConfigXMLProperty `xml:"property"`
}
type routerConfigJson struct {
Kvs map[string]string `json:"kvs"`
}
type catRouterConfig struct {
scheduleMixin
sample float64
routers []serverAddress
current *serverAddress
ticker *time.Ticker
}
var router = catRouterConfig{
scheduleMixin: makeScheduleMixedIn(signalRouterExit),
sample: 1.0,
routers: make([]serverAddress, 0),
ticker: nil,
}
func (c *catRouterConfig) GetName() string {
return "Router"
}
func (c *catRouterConfig) updateRouterConfig() {
var u *url.URL
if config.router == "" {
var query = url.Values{}
query.Add("env", config.env)
query.Add("domain", config.domain)
query.Add("ip", config.ip)
query.Add("hostname", config.hostname)
query.Add("op", "json")
u = &url.URL{
Scheme: "http",
Path: "/cat/s/router",
RawQuery: query.Encode(),
}
} else {
u, _ = url.Parse(config.router)
}
client := http.Client{
Timeout: 5 * time.Second,
}
if config.router == "" {
for _, server := range config.serverAddress {
u.Host = fmt.Sprintf("%s:%d", server.Host, server.HttpPort)
logger.Info("Getting router config from %s", u.String())
resp, err := client.Get(u.String())
if err != nil {
logger.Warning("Error occurred while getting router config from url %s", u.String())
continue
}
err = c.parse(resp.Body)
if err == nil {
return
} else {
continue
}
}
} else {
resp, err := client.Get(u.String())
if err != nil {
logger.Warning("Error occurred while getting router config from url %s", u.String())
return
}
err = c.parse(resp.Body)
if err == nil {
return
}
}
logger.Error("Can't get router config from remote server.")
return
}
func (c *catRouterConfig) handle(signal int) {
switch signal {
case signalResetConnection:
logger.Warning("Connection has been reset, reconnecting.")
c.current = nil
c.updateRouterConfig()
default:
c.scheduleMixin.handle(signal)
}
}
func (c *catRouterConfig) afterStart() {
c.ticker = time.NewTicker(time.Minute * 3)
c.updateRouterConfig()
}
func (c *catRouterConfig) beforeStop() {
c.ticker.Stop()
}
func (c *catRouterConfig) process() {
select {
case sig := <-c.signals:
c.handle(sig)
case <-c.ticker.C:
c.updateRouterConfig()
}
}
func (c *catRouterConfig) updateSample(v string) error {
sample, err := strconv.ParseFloat(v, 32)
if err != nil {
logger.Warning("Sample should be a valid float, %s given", v)
return err
} else if math.Abs(sample-c.sample) > 1e-9 {
c.sample = sample
logger.Info("Sample rate has been set to %f%%", c.sample*100)
}
return nil
}
func (c *catRouterConfig) updateBlock(v string) {
if v == "false" {
enable()
} else {
disable()
}
}
func (c *catRouterConfig) parse(reader io.ReadCloser) error {
bytes, err := ioutil.ReadAll(reader)
if err != nil {
return err
}
t := new(routerConfigJson)
if err := json.Unmarshal(bytes, &t); err != nil {
logger.Warning("Error occurred while parsing router config json content.\n%s", string(bytes))
}
for k, v := range t.Kvs {
switch k {
case propertySample:
err = c.updateSample(v)
if err != nil {
return err
}
case propertyRouters:
err = c.updateRouters(v)
if err != nil {
return err
}
case propertyBlock:
c.updateBlock(v)
}
}
return nil
}
func (c *catRouterConfig) updateRouters(router string) error {
newRouters := resolveServerAddresses(router)
oldLen, newLen := len(c.routers), len(newRouters)
if newLen == 0 {
return errors.New("Routers not found")
} else if oldLen == 0 {
logger.Info("Routers has been initialized to: %s", newRouters)
c.routers = newRouters
} else if oldLen != newLen {
logger.Info("Routers has been changed to: %s", newRouters)
c.routers = newRouters
} else {
for i := 0; i < oldLen; i++ {
if !compareServerAddress(&c.routers[i], &newRouters[i]) {
logger.Info("Routers has been changed to: %s", newRouters)
c.routers = newRouters
break
}
}
}
for _, server := range newRouters {
if compareServerAddress(c.current, &server) {
return nil
}
addr := fmt.Sprintf("%s:%d", server.Host, server.Port)
if conn, err := net.DialTimeout("tcp", addr, time.Second); err != nil {
logger.Info("Failed to connect to %s, retrying...", addr)
return errors.New("Failed to connect to " + addr)
} else {
c.current = &server
logger.Info("Connected to %s.", addr)
sender.chConn <- conn
return nil
}
}
logger.Info("Cannot established a connection to cat server.")
return nil
}