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awslambda.go
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awslambda.go
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package awsapi
import (
"log"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/lambda"
"github.com/aws/aws-sdk-go/service/lambda/lambdaiface"
)
const (
// AsyncInvokeEvent indicates invocation type = Event
AsyncInvokeEvent = "Event"
// AsyncInvokeRequest indicates invocation type = RequestResponse
AsyncInvokeRequest = "RequestResponse"
// ActionInvoke indicates action to invoke function
ActionInvoke = "lambda:InvokeFunction"
// PrincipalEvents indicates principal of cloudwatchevents to invoke lambda
PrincipalEvents = "events.amazonaws.com"
)
// InvokeLambda invoke a lambda function
func (awsapi *AWSAPI) InvokeLambda(lambdasvc lambdaiface.LambdaAPI,
funcArn string, payload []byte, invokeType string) (*lambda.InvokeOutput, error) {
input := lambda.InvokeInput{
FunctionName: aws.String(funcArn),
Payload: payload,
InvocationType: aws.String(invokeType),
}
output, err := lambdasvc.Invoke(&input)
if err != nil {
log.Printf("AWSError: fail to invoke lambda %s input=(%s) invocation=(%s), err: %v",
funcArn, string(payload), invokeType, err)
return nil, err
}
log.Printf("Lambda Function invoked: arn %s input=(%s) invocation=(%s), output=(%+v)",
funcArn, string(payload), invokeType, output)
return output, nil
}
// LambdaAddPermission helps to call lambda.AddPermission api
func (awsapi *AWSAPI) LambdaAddPermission(lambdasvc lambdaiface.LambdaAPI,
action, funcName, principal, source, stateID string) error {
input := &lambda.AddPermissionInput{
Action: aws.String(action),
FunctionName: aws.String(funcName),
Principal: aws.String(principal),
SourceArn: aws.String(source),
StatementId: aws.String(stateID),
}
output, err := lambdasvc.AddPermission(input)
if err != nil {
log.Printf("AWSError: fail to add permission to lambda %s "+
"w/ (source=%s, action=%s, principal=%s, stateID=%s)", funcName, source,
action, principal, stateID)
return err
}
/* statement example:
* `{"Sid":"randstateid12345","Effect":"Allow",
* "Principal":{"Service":"events.amazonaws.com"},
* "Action":"lambda:InvokeFunction","Resource":"arn:aws:lambda:
* ap-northeast-1:054657590879:function:test_gui_sqs_receiver",
* "Condition":{"ArnLike":{"AWS:SourceArn":"arn:aws:events:ap-northeast-1:
* 054657590879:rule/lambdaname-randid"}}}) `
*/
log.Printf("Succeed to add permission to lambda %s", *output.Statement)
return nil
}
// NewLambdaAPI returns a Lambda API
func NewLambdaAPI(sess AWSSession) lambdaiface.LambdaAPI {
lambdasess, err := sess.NewSession()
if err != nil {
log.Printf("AWSError: Cannot create aws session, err %#v", err)
return nil
}
return lambda.New(lambdasess)
}