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package main
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
"github.com/aws/aws-lambda-go/lambda"
"github.com/aws/aws-lambda-go/lambdacontext"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/sqs"
)
// RunnerEvent is the event passed in
type RunnerEvent struct {
QueueURL string `json:"queue_url"`
RepoURL string `json:"repo_url"`
RepoFullName string `json:"repo_fullname"`
Token string `json:"token"`
VirtualID string `json:"virtual_id"`
Event string `json:"event"`
}
// RunnerToken is the token used for the github runner
type RunnerToken struct {
Token string `json:"token"`
}
// HandleRequest handles the lambda request
func HandleRequest(ctx context.Context, event RunnerEvent) (string, error) {
defer func() {
if e := recover(); e != nil {
fmt.Println("Recovered from panic", e)
}
}()
tempToken := event.Token
event.Token = "******"
fmt.Println(event)
event.Token = tempToken
lc, _ := lambdacontext.FromContext(ctx)
fmt.Println("Getting runner token")
client := http.Client{
Timeout: time.Duration(30 * time.Second),
}
url := "https://api.github.com/repos/" + event.RepoFullName + "/actions/runners/registration-token"
fmt.Println(url)
request, _ := http.NewRequest("POST", url, nil)
request.Header.Set("Accept", "application/vnd.github.v3+json")
request.Header.Set("Authorization", "token "+event.Token)
request.Header.Set("User-Agent", "lambda-github-runner")
resp, err := client.Do(request)
if err != nil || resp.StatusCode != 201 {
fmt.Println("Unable to get runner registrtation token", err)
fmt.Println(resp)
return "Unable to get runner registration token", err
}
defer resp.Body.Close()
regToken := RunnerToken{}
regData, _ := ioutil.ReadAll(resp.Body)
json.Unmarshal(regData, ®Token)
fmt.Println("Move runner directory to lambda /tmp")
err = os.Mkdir("/tmp/runner", 0755)
if os.IsExist(err) == false {
err = copy("/runner", "/tmp/runner")
if err != nil {
fmt.Println("Unable to copy runner", err)
return "Unable to copy runner", err
}
}
err = os.Mkdir("/tmp/toolcache", 0755)
fmt.Println("Removing runner in case one already exists")
err = stopAndDecomissionRunner(regToken)
if err != nil {
fmt.Printf("Unable to remove runner, going to continue anyway\n", err)
}
fmt.Printf("Configuring runner (Request: %s|RepoUrl: %s|RepoFullName: %s|QueueUrl: %s)...\n", lc.AwsRequestID, event.RepoURL, event.RepoFullName, event.QueueURL)
runnerName := "lambda-" + lc.AwsRequestID
if event.Event == "create" {
runnerName = "DEFAULT-LAMBDA-DO-NOT-REMOVE"
fmt.Println("Creating default runner")
}
configcmd := exec.Command("/tmp/runner/config.sh", "--url", event.RepoURL, "--token", regToken.Token, "--name", runnerName, "--runnergroup", "lambda", "--labels", "lambda", "--work", "_work", "--replace")
out, err := configcmd.Output()
if err != nil {
fmt.Println(string(out), err)
readRunnerLogs()
return fmt.Sprint(out), err
}
if os.Getenv("ALWAYS_PRINT_LOGS") == "true" {
readRunnerLogs()
}
// if event is 'created', bail after configured
if event.Event == "create" {
fmt.Println("This is a create event, stopping runner")
return fmt.Sprint("Runner created"), nil
}
fmt.Println("Starting runner...")
err = startRunner()
if err != nil {
return fmt.Sprint("Unable to start runner"), err
}
fmt.Println("Runner started...")
// Setup Virtual Queue and wait for Message
sess := session.Must(session.NewSessionWithOptions(session.Options{
SharedConfigState: session.SharedConfigEnable,
}))
svc := sqs.New(sess)
fmt.Println("Starting to listener for complete message")
for {
msgResult, err := svc.ReceiveMessage(&sqs.ReceiveMessageInput{
AttributeNames: []*string{
aws.String(sqs.MessageSystemAttributeNameSentTimestamp),
},
MessageAttributeNames: []*string{
aws.String(sqs.QueueAttributeNameAll),
},
QueueUrl: aws.String(event.QueueURL),
MaxNumberOfMessages: aws.Int64(1),
VisibilityTimeout: aws.Int64(60),
})
if err != nil {
fmt.Println("Error while receiving messages", err)
}
if len(msgResult.Messages) > 0 {
if strings.Compare(*msgResult.Messages[0].Body, event.VirtualID) == 0 {
fmt.Println("Message received, closing runner")
_, err = svc.DeleteMessage(&sqs.DeleteMessageInput{
QueueUrl: aws.String(event.QueueURL),
ReceiptHandle: msgResult.Messages[0].ReceiptHandle,
})
if err != nil {
fmt.Println("Error while deleting message", err)
}
break
}
}
deadline, _ := ctx.Deadline()
deadline = deadline.Add(-30 * time.Second)
if time.Until(deadline).Seconds() < 0 {
fmt.Println("Function is about to timeout, decomissioning")
break
}
}
err = stopAndDecomissionRunner(regToken)
fmt.Println("Complete!")
return fmt.Sprint("Complete!"), err
}
// startRunner starts the github runner
func startRunner() error {
runcmd := exec.Command("/tmp/runner/run.sh")
// Something with output
return runcmd.Start()
}
// stopAndDecomissionRunner stops and removes the runner
func stopAndDecomissionRunner(event RunnerToken) error {
fmt.Println("Removing runner...")
configcmd := exec.Command("/tmp/runner/config.sh", "remove", "--token", event.Token)
_, err := configcmd.Output()
if err != nil {
fmt.Println("Unable to remove runner", err)
return err
}
fmt.Println("Runner removed")
return nil
}
// readRunnerLogs reads the runners logs to console
func readRunnerLogs() {
fmt.Println("Reading logs...")
// Try to get logs
files, _ := ioutil.ReadDir("/tmp/runner/_diag")
for _, f := range files {
fmt.Println(f.Name())
content, _ := ioutil.ReadFile("/tmp/runner/_diag/" + f.Name())
fmt.Println(string(content))
}
fmt.Println("Done reading logs...")
}
// copy copies the source to destination directories recursively
func copy(source, destination string) error {
var err error = filepath.Walk(source, func(path string, info os.FileInfo, err error) error {
var relPath string = strings.Replace(path, source, "", 1)
if relPath == "" {
return nil
}
if info.IsDir() {
return os.Mkdir(filepath.Join(destination, relPath), 0755)
}
var data, err1 = ioutil.ReadFile(filepath.Join(source, relPath))
if err1 != nil {
return err1
}
return ioutil.WriteFile(filepath.Join(destination, relPath), data, 0777)
})
return err
}
func main() {
lambda.Start(HandleRequest)
}