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main.go
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main.go
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package main
import (
"context"
"encoding/base64"
"fmt"
"log"
"os"
"github.com/aws/aws-lambda-go/events"
"github.com/aws/aws-lambda-go/lambda"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/euank/buildkite-kettle/buildkite"
"github.com/euank/buildkite-kettle/config"
)
var c config.Config
func handleCron() error {
return nil
}
func handleBuildEvent(e buildkite.BuildEvent) error {
switch e.Event {
case buildkite.EventTypeBuildScheduled:
pc, err := c.GetPipelineConfig(*e.Pipeline.Name)
if err != nil {
return err
}
client := ec2.New(session.New())
instances, err := client.DescribeInstances(&ec2.DescribeInstancesInput{
Filters: []*ec2.Filter{
{
Name: aws.String("tag:buildkite"),
Values: aws.StringSlice([]string{"name-" + pc.Name}),
},
},
})
if err != nil {
log.Printf("error getting instance list: %v\n", err)
return err
}
numInstances := 0
for _, res := range instances.Reservations {
for _, inst := range res.Instances {
if *inst.State.Name == ec2.InstanceStateNameRunning || *inst.State.Name == ec2.InstanceStateNamePending {
numInstances++
}
}
}
if numInstances >= pc.Config.MaxInstances {
log.Printf("already %v instances for pipeline, no more needed", numInstances)
return nil
}
_, err = client.RunInstances(&ec2.RunInstancesInput{
ImageId: &pc.Config.AMI,
KeyName: &pc.Config.KeypairName,
BlockDeviceMappings: []*ec2.BlockDeviceMapping{
{
DeviceName: aws.String("/dev/xvda"),
Ebs: &ec2.EbsBlockDevice{
VolumeSize: aws.Int64(int64(pc.Config.StorageSize)),
},
},
},
InstanceInitiatedShutdownBehavior: aws.String("terminate"),
InstanceType: &pc.Config.InstanceType,
UserData: aws.String(base64.StdEncoding.EncodeToString([]byte(pc.Config.UserData))),
MinCount: aws.Int64(1),
MaxCount: aws.Int64(1),
TagSpecifications: []*ec2.TagSpecification{
{
ResourceType: aws.String("instance"),
Tags: []*ec2.Tag{
{
Key: aws.String("tag:buildkite"),
Value: aws.String("name-" + pc.Name),
},
},
},
},
})
if err != nil {
log.Printf("error launching instances: %v", err)
}
return err
}
return nil
}
func handleRequest(ctx context.Context, event events.APIGatewayProxyRequest) error {
if os.Getenv("CRON") != "" {
log.Printf("running cron\n")
return handleCron()
}
if event.Headers["X-Buildkite-Token"] != c.BuildkiteToken {
log.Printf("bad token\n")
return fmt.Errorf("invalid buildkite token")
}
bke, err := buildkite.Unmarshal([]byte(event.Body))
if err != nil {
log.Printf("bad event: %v\n", err)
return fmt.Errorf("unable to unmarshal event: %v", err)
}
switch e := bke.(type) {
case buildkite.BuildEvent:
return handleBuildEvent(e)
default:
log.Printf("did not handle event: %v\n", e)
}
return nil
}
func main() {
c2, err := config.New()
if err != nil {
log.Fatalf("improper build: %s", err)
}
if os.Getenv("TEST_CONFIG") != "" {
return
}
c = c2
lambda.Start(handleRequest)
}