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domain.go
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domain.go
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package domain
import (
"time"
"math/rand"
"strings"
"encoding/json"
"github.com/golang/glog"
"golang.org/x/net/context"
"github.com/coreos/etcd/mvcc/mvccpb"
etcdv3 "github.com/coreos/etcd/clientv3"
"github.com/tiglabs/containerdns/dns-schedule/base"
string_tools "github.com/tiglabs/containerdns/utils/strs"
)
const (
KEY_NOT_FOUND = "key not found"
)
func SyncJobForDomain() error {
glog.V(100).Infoln("Sync domain job...")
if job_domain_response, err1 := base.Schedule.Client.Get(base.GetDnsJobPath(), true); (err1 != nil && err1.Error() != KEY_NOT_FOUND) {
return err1
} else if real_domain_response, err2 := base.Schedule.Client.Get(base.Config.Etcd.DomainPath, true); (err2 != nil && err2.Error() != KEY_NOT_FOUND ){
return err2
} else {
invalid_domains := make(map[string]string)
real_domains := make(map[string]string)
if real_domain_response != nil {
for _, kv := range real_domain_response.Kvs {
sub_domain := _generate_real_domain(string(kv.Key))
real_domains[sub_domain] = string(kv.Key)
}
}
if job_domain_response != nil {
for _, kv := range job_domain_response.Kvs {
domain := strings.TrimPrefix(string(kv.Key), base.GetDnsJobPath())
if _, ok := real_domains[domain]; ok {
delete(real_domains, domain)
} else {
invalid_domains[domain] = string(kv.Key)
}
}
}
glog.V(50).Infoln("New domains:", real_domains)
glog.V(50).Infoln("Invalid domains:", invalid_domains)
// add new job to domain job path
for sub_domain := range real_domains {
glog.V(50).Infoln("Add new sub domain: ", sub_domain, "to domain job path ", base.GetDnsJobPath())
assign_task := base.AssignTask{Status: "DOWN", InitTag: 1}
bytes, _ := json.Marshal(assign_task)
if err := base.Schedule.Client.Set(base.GetDnsJobPath() + sub_domain, string(bytes)); err != nil {
glog.Error("Sync new sub domain to report data failed, due to ", err)
return err
}
}
// delete invalid sub domain from job path
for sub_domain := range invalid_domains {
glog.V(50).Infoln("Delete invalid sub domain: ", base.GetDnsJobPath(), sub_domain)
base.Schedule.Client.DoDelete(base.GetDnsJobPath() + sub_domain)
}
}
return nil
}
func WatchDomainPath() {
glog.V(100).Infoln("Start watch", base.Config.Etcd.DomainPath, "...")
ctx := context.Background()
var watcher etcdv3.WatchChan
opts := []etcdv3.OpOption{}
opts = append(opts, etcdv3.WithPrefix())
opts = append(opts, etcdv3.WithPrevKV())
watcher = base.Schedule.Client.Watch(ctx, base.Config.Etcd.DomainPath, opts...)
for wres := range watcher {
if wres.Err() != nil {
err := wres.Err()
glog.Infof("watch chan error: %v sleep 2s", err)
time.Sleep(2 * time.Second)
return
}
for _, e := range wres.Events {
if e.Type == mvccpb.PUT {
sub_domain := _generate_real_domain(string(e.Kv.Key))
glog.V(50).Infoln("Discover domain path changed, and init sub domain ", sub_domain)
assign_task := base.AssignTask{Status: "DONW", InitTag: 1}
bytes, _ := json.Marshal(assign_task)
if err := base.Schedule.Client.Set(base.GetDnsJobPath() + sub_domain, string(bytes)); err != nil {
if strings.HasPrefix(err.Error(), base.EtcdKeyalReadyExists) {
glog.V(0).Infoln(string(e.Kv.Key), "already handled by other schedule-agent")
} else {
glog.Error("Set job ", base.GetDnsJobPath() + sub_domain, " failed, due to ", err.Error())
}
}
} else if e.Type == mvccpb.DELETE {
sub_domain := _generate_real_domain(string(e.Kv.Key))
glog.V(50).Infoln("Discover domain path change, and delete sub domain key", sub_domain)
base.Schedule.Client.DoDelete(base.GetDnsJobPath() + sub_domain)
} else {
glog.Warningln("Discover unknow domain path change:", e.Type, "-->", string(e.Kv.Key))
}
}
}
}
func updateDnsJob(agent_host, domain string) {
glog.V(0).Infoln("Schedule subdomain ", domain, " to target host ", agent_host)
assign_task := base.AssignTask{Status: "DOWN", AgentName: agent_host, UpdateTime: time.Now().Local().Format("2006-01-02 15:04:05"), InitTag: 0}
bytes, _ := json.Marshal(assign_task)
if rep, err := base.Schedule.Client.Get(base.GetDnsJobPath() + domain, false); err == nil {
if update_err := base.Schedule.Client.Update(base.GetDnsJobPath() + domain, string(bytes), string(rep.Kvs[0].Value)); update_err != nil {
glog.Error("Update domain job to etcd failed, due to ", update_err.Error())
}
}
}
func loopJob() (map[string][]string, []string, error) {
glog.V(100).Infoln("Run loopJob for domain...")
allocation := make(map[string][]string)
init_domains := make([]string, 0, 10)
if response, e := base.Schedule.Client.Get(base.GetDnsJobPath(), true); e == nil {
for _, kv := range response.Kvs {
sub_domain := strings.TrimPrefix(string(kv.Key), base.GetDnsJobPath())
assign_task := base.AssignTask{}
if e := json.Unmarshal(kv.Value, &assign_task); e != nil {
glog.Error("Unmarshal domain data from etcd error, due to ", e.Error())
continue
}
if assign_task.InitTag == 1 {
init_domains = append(init_domains, sub_domain)
} else if _, ok := allocation[assign_task.AgentName]; !ok {
allocation[assign_task.AgentName] = make([]string, 0, 10)
allocation[assign_task.AgentName] = append(allocation[assign_task.AgentName], sub_domain)
} else {
allocation[assign_task.AgentName] = append(allocation[assign_task.AgentName], sub_domain)
}
}
} else {
return nil, nil, e
}
return allocation, init_domains, nil
}
func scheduleWaitPool(active_agents, inactive_agents, new_agents, wait_pool []string, allocation map[string][]string) {
glog.V(100).Infoln("Run scheduleWaitPool with active_agents:", active_agents, "inactive_agents:", inactive_agents, "new_agents:", new_agents, "wait_pool:", wait_pool,
"allocation:", allocation)
valid_agents := append(active_agents, new_agents...)
valid_agents_number := len(valid_agents)
for _, ip_pool := range allocation {
wait_pool = append(wait_pool, ip_pool[:]...)
}
per := len(wait_pool) / valid_agents_number
for index, sub_domain := range wait_pool {
if per == 0 || (index / per) >= len(valid_agents) {
rand.Seed(int64(time.Now().Nanosecond()))
agent_hostname := valid_agents[rand.Intn(len(valid_agents))]
updateDnsJob(agent_hostname, sub_domain)
} else{
agent_hostname := valid_agents[index / per]
updateDnsJob(agent_hostname, sub_domain)
}
}
}
func Run() {
var (
active_agents, inactive_agents, new_agents, init_domains []string
allocation map[string][]string
job_error, heartbeat_error error
)
for {
if lock_failed := base.Schedule.LockDomainKey(); lock_failed != nil {
glog.Error("Lock failed, due to ", lock_failed.Error())
time.Sleep(time.Second)
continue
}
if allocation, init_domains, job_error = loopJob(); job_error != nil {
glog.Error("Get etcd domain job data failed, due to ", job_error.Error())
base.Schedule.UnlockDomainKey()
time.Sleep(time.Second * time.Duration(base.Config.General.ScheduleInteval))
continue
}
if active_agents, inactive_agents, new_agents, heartbeat_error = base.LoopAgentHeartBeat(allocation); heartbeat_error != nil {
if heartbeat_error.Error() == base.EtcdNoAgentWasFound {
glog.Warning("No agent was found, will waiting")
} else {
glog.Error("Get agent heart beat from etcd failed, due to ", heartbeat_error.Error())
}
base.Schedule.UnlockDomainKey()
time.Sleep(time.Second * time.Duration(base.Config.General.ScheduleInteval))
continue
}
if (len(active_agents) + len(new_agents)) == 0 {
glog.V(0).Infoln("No active scanner-agent, waiting for heartbeat...")
base.Schedule.UnlockDomainKey()
time.Sleep(time.Second * time.Duration(base.Config.General.ScheduleInteval))
continue
}
wait_pool := make([]string, 0, 10)
if len(init_domains) > 0 {
glog.V(100).Infoln(init_domains, "need to be initialized")
wait_pool = append(wait_pool, init_domains[:]...)
}
scheduleWaitPool(active_agents, inactive_agents, new_agents, wait_pool, allocation)
base.Schedule.UnlockDomainKey()
time.Sleep(time.Second * time.Duration(base.Config.General.ScheduleInteval))
}
}
func _generate_real_domain(domain string) string {
domain = string_tools.TrimSlash(domain)
domain_list := strings.Split(domain, "/")
// first string is "containerdns", and last string is ip's md5 value, ignore
real_domain_list := make([]string, len(domain_list)-2)
for i := len(domain_list)-2; i > 0; i-- {
real_domain_list[len(domain_list) - 2 - i] = domain_list[i]
}
return strings.Join(real_domain_list, ".")
}