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descartes.go
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descartes.go
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package main
import (
"encoding/json"
"flag"
"github.com/chenziliang/descartes/base"
"github.com/chenziliang/descartes/services"
"github.com/chenziliang/descartes/mgmt"
"github.com/golang/glog"
"io/ioutil"
"os"
"os/signal"
"syscall"
"time"
)
func getGlobalConfig(fileName string) (base.BaseConfig, error) {
content, err := ioutil.ReadFile(fileName)
if err != nil {
glog.Errorf("Failed to read %s, error=%s", fileName, err)
return nil, err
}
configs := make(map[string]base.BaseConfig)
err = json.Unmarshal(content, &configs)
if err != nil {
glog.Errorf("Failed to unmarshal %s, error=%s", fileName, err)
return nil, err
}
globalConfig := make(map[string]string)
for _, config := range configs {
for k, v := range config {
globalConfig[k] = v
}
}
return globalConfig, nil
}
func getTasks(fileName string) (map[string][]base.BaseConfig, error) {
content, err := ioutil.ReadFile(fileName)
if err != nil {
glog.Errorf("Failed to read %s, error=%s", fileName, err)
return nil, err
}
tasks := make(map[string][]base.BaseConfig)
err = json.Unmarshal(content, &tasks)
if err != nil {
glog.Errorf("Failed to unmarshal %s, error=%s", fileName, err)
return nil, err
}
return tasks, nil
}
func setupSignalHandler() <-chan os.Signal {
c := make(chan os.Signal, 2)
signal.Notify(c, os.Interrupt, os.Kill, syscall.SIGHUP, syscall.SIGINT,
syscall.SIGTERM, syscall.SIGQUIT)
return c
}
func handleDataCollection(globalConfig base.BaseConfig) {
config := make(base.BaseConfig)
for k, v := range globalConfig {
config[k] = v
}
collect := services.NewCollectService(config)
if collect == nil {
panic("Failed to create collect service")
}
collect.Start()
c := setupSignalHandler()
<-c
// tear down
collect.Stop()
}
func writeTaskConfigs(globalConfig base.BaseConfig, snow_task_file, kafka_task_file string) {
config := make(base.BaseConfig)
for k, v := range globalConfig {
config[k] = v
}
config[base.KafkaTopic] = base.TaskConfig
config[base.Key] = base.TaskConfig
configWriter := mgmt.NewTaskConfigWriter(config)
configWriter.Start()
defer configWriter.Stop()
snowTasks, err := getTasks(snow_task_file)
if err != nil {
return
}
kafkaTasks, err := getTasks(kafka_task_file)
if err != nil {
return
}
var allTasks []base.BaseConfig
for _, tasks := range snowTasks {
for _, task := range tasks {
task[base.KafkaTopic] = services.GenerateTopic(task[base.App],
task[base.ServerURL], task[base.Username])
for k, v := range globalConfig {
task[k] = v
}
task[base.TaskConfigAction] = base.TaskConfigNew
task[base.TaskConfigKey] = task[base.KafkaTopic] + "_" + task[base.Metric]
allTasks = append(allTasks, task)
}
}
for _, tasks := range kafkaTasks {
for _, task := range tasks {
task[base.KafkaTopic] = services.GenerateTopic("snow",
task["SourceServerURL"], task["SourceUsername"])
for k, v := range globalConfig {
task[k] = v
}
task[base.TaskConfigAction] = base.TaskConfigNew
task[base.TaskConfigKey] = ""
allTasks = append(allTasks, task)
}
}
configWriter.Write(allTasks)
}
func handleScheduling(globalConfig base.BaseConfig) {
config := make(base.BaseConfig)
for k, v := range globalConfig {
config[k] = v
}
schedule := services.NewScheduleService(config)
if schedule == nil {
panic("Failed to create schedule service")
}
schedule.Start()
c := setupSignalHandler()
<-c
// tear down
schedule.Stop()
}
func main() {
role := flag.String("role", "", "[task_scheduler|data_collector|mgmt]")
snow_task_file := flag.String("snow_task_file", "snow_tasks.json", "")
kafka_task_file := flag.String("kafka_task_file", "kafka_tasks.json", "")
flag.Parse()
if *role == "" {
flag.PrintDefaults()
os.Exit(1)
}
globalConfig, err := getGlobalConfig("global_settings.json")
if err != nil {
return
}
if *role == "task_scheduler" {
handleScheduling(globalConfig)
} else if *role == "data_collector" {
handleDataCollection(globalConfig)
} else if *role == "mgmt" {
writeTaskConfigs(globalConfig, *snow_task_file, *kafka_task_file)
} else {
flag.PrintDefaults()
os.Exit(1)
}
time.Sleep(2 * time.Second)
}