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lambdaexecution.go
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lambdaexecution.go
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package awslambdaproxy
import (
"encoding/json"
"log"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/lambda"
"github.com/pkg/errors"
)
type lambdaExecutionManager struct {
regions []string
frequency time.Duration
publicIP string
sshPort string
sshKey string
sshUser string
}
type lambdaPayload struct {
ConnectBackAddress string
SSHPort string
SSHKey string
SSHUser string
}
func (l *lambdaExecutionManager) run() {
log.Println("Using public IP", l.publicIP)
log.Println("Lambda execution frequency", l.frequency)
for {
for region := range l.regions {
l.executeFunction(region)
time.Sleep(l.frequency)
}
}
}
func (l *lambdaExecutionManager) executeFunction(region int) error {
log.Println("Executing Lambda function in region", l.regions[region])
sess := session.New(&aws.Config{})
svc := lambda.New(sess, &aws.Config{Region: aws.String(l.regions[region])})
lambdaPayload := lambdaPayload{
ConnectBackAddress: l.publicIP,
SSHPort: l.sshPort,
SSHKey: l.sshKey,
SSHUser: l.sshUser,
}
payload, _ := json.Marshal(lambdaPayload)
params := &lambda.InvokeInput{
FunctionName: aws.String(lambdaFunctionName),
InvocationType: aws.String(lambda.InvocationTypeEvent),
Payload: payload,
}
_, err := svc.Invoke(params)
if err != nil {
return errors.Wrap(err, "Failed to execute Lambda function")
}
return nil
}
func newLambdaExecutionManager(publicIP string, regions []string, frequency time.Duration, sshUser string, sshPort string,
privateKey []byte, onDemandExecution chan bool) (*lambdaExecutionManager, error) {
executionManager := &lambdaExecutionManager{
regions: regions,
frequency: frequency,
publicIP: publicIP,
sshPort: sshPort,
sshKey: string(privateKey[:]),
sshUser: sshUser,
}
go executionManager.run()
go func() {
for {
<-onDemandExecution
log.Println("Starting new tunnel as existing tunnel failed")
executionManager.executeFunction(0)
time.Sleep(time.Second * 5)
}
}()
return executionManager, nil
}