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extension.go
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extension.go
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// This test uses AWS Lambda Runtime Interface Emulator to check simple lambda function with internal extension using this library.
package main
import (
"context"
"log"
"os"
"sync"
"github.com/aws/aws-lambda-go/lambda"
"github.com/zakharovvi/aws-lambda-extensions/extapi"
)
var journal *os.File
func HandleRequest(ctx context.Context) error {
appendJournal("function.HandleRequest\n")
return nil
}
type Extension struct {
wg sync.WaitGroup
}
func (ext *Extension) Init(ctx context.Context, client *extapi.Client) error {
appendJournal("extension.Init\n")
ext.wg.Done()
return nil
}
func (ext *Extension) HandleInvokeEvent(ctx context.Context, event *extapi.NextEventResponse) error {
appendJournal("extension.HandleInvokeEvent\n")
return nil
}
func (ext *Extension) Shutdown(ctx context.Context, reason extapi.ShutdownReason, err error) error {
// shutdown event type is not supported in AWS Lambda Runtime Interface Emulator
return nil
}
func (ext *Extension) Err() <-chan error {
return nil
}
func main() {
var err error
journal, err = os.Create("/tmp/rie-test-journal")
if err != nil {
log.Panic(err)
}
defer func() {
journal.Close()
os.Remove(journal.Name())
}()
// start the extension and wait for registration before proceeding to initialize the runtime
ext := &Extension{}
ext.wg.Add(1)
go func() {
if err := extapi.Run(
context.Background(),
ext,
extapi.WithEventTypes([]extapi.EventType{extapi.Invoke}), // ShutdownEventNotSupportedForInternalExtension
); err != nil {
log.Panic(err)
}
}()
ext.wg.Wait()
// run lambda runtime
lambda.Start(HandleRequest)
}
func appendJournal(s string) {
if _, err := journal.WriteString(s); err != nil {
log.Panic(err)
}
if err := journal.Sync(); err != nil {
log.Panic(err)
}
}