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main.go
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main.go
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package main
import (
"flag"
"fmt"
"log"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/axcdnt/ecs-explorer/services"
)
// aws limits the query in 10 services/request
const maxServicesPerRequest = 10
func main() {
clusterFlag := flag.String("cluster", "", "the cluster name")
suffixFlag := flag.String("suffix", "", "the service name suffix to look for")
servicesFlag := flag.String("services", "", "a comma separated list of services")
flag.Parse()
validateFlags(*clusterFlag, *suffixFlag, *servicesFlag)
session := awsSession()
serviceNames := parseServiceNames(*suffixFlag, *servicesFlag)
queries := partitionIn(serviceNames)
resp := make(chan string)
for _, query := range queries {
ecsService := services.EcsService{
Cluster: clusterFlag,
Services: query,
Session: session,
}
go ecsService.Query(resp)
}
for range serviceNames {
fmt.Print(<-resp)
}
}
func parseServiceNames(suffix, services string) []*string {
names := strings.Split(services, ",")
var result []*string
for _, name := range names {
fullName := strings.Trim(fmt.Sprintf("%s%s", name, suffix), "")
result = append(result, aws.String(fullName))
}
return result
}
func awsSession() *session.Session {
session, err := session.NewSession(
&aws.Config{Region: aws.String("us-east-1")})
if err != nil {
log.Fatal(err)
}
return session
}
func validateFlags(clusterFlag, suffixFlag, servicesFlag string) {
if len(clusterFlag) == 0 {
log.Fatalln("missing flag: -cluster")
}
if len(suffixFlag) == 0 {
log.Fatalln("missing flag: -suffix")
}
if len(servicesFlag) == 0 {
log.Fatalln("missing flag: -services")
}
}
// this function makes partitions of a slice based on the desired size
func partitionIn(services []*string) [][]*string {
numOfSlices := len(services) / maxServicesPerRequest
startRange := 0
endRange := maxServicesPerRequest
var allSlices [][]*string
for i := 0; i < numOfSlices; i++ {
slice := services[startRange:endRange]
allSlices = append(allSlices, slice)
startRange = endRange
endRange += maxServicesPerRequest
}
lastSlice := services[numOfSlices*maxServicesPerRequest:]
if len(lastSlice) > 0 {
// corner case to avoid empty slices
allSlices = append(allSlices, lastSlice)
}
return allSlices
}