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main.go
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main.go
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package handler
import (
"context"
"fmt"
"github.com/aws/aws-lambda-go/lambda"
cloudevents "github.com/cloudevents/sdk-go"
"github.com/cloudevents/sdk-go/pkg/cloudevents/transport"
"github.com/jakubknejzlik/cloudevents-lambda-handler/encoding"
)
type CloudEventsReceiver = func(cloudevents.Event) error
type CloudEventsLambdaHandler struct {
receiver CloudEventsReceiver
codec transport.Codec
}
func (h *CloudEventsLambdaHandler) Start() {
lambda.StartHandler(h)
}
func (h *CloudEventsLambdaHandler) Invoke(ctx context.Context, payload []byte) (res []byte, err error) {
var messageBodies [][]byte
if m, ok := DecodeEventBridgeEvent(payload); ok {
messageBodies = m.GetBodies()
} else if m, ok := DecodeSNSEvent(payload); ok {
messageBodies = m.GetBodies()
} else if m, ok := DecodeSQSEvent(payload); ok {
messageBodies = m.GetBodies()
} else {
err = fmt.Errorf("failed to decode payload %s", string(payload))
return
}
for _, body := range messageBodies {
msg := &encoding.Message{
Body: body,
}
event, _err := h.codec.Decode(ctx, msg)
if _err != nil {
err = _err
return
}
err = h.receiver(*event)
if err != nil {
return
}
}
return
}
func NewCloudEventsLambdaHandler(receiver CloudEventsReceiver) CloudEventsLambdaHandler {
codec := &encoding.Codec{}
return CloudEventsLambdaHandler{receiver: receiver, codec: codec}
}