I'm putting and reading files to S3 using the AWS golang v2 SDK. Locally I am using local stack and thus need to set the param S3ForcePathStyle. But, I can't find where to set this parameter in the config.
This is what my config looks like:
conf, err = config.LoadDefaultConfig(
context.TODO(),
config.WithRegion("us-east-1"),
config.WithEndpointResolver(
aws.EndpointResolverFunc(func(service, region string) (aws.Endpoint, error) {
return aws.Endpoint{
PartitionID: "aws",
URL: "http://localstack:4566",
SigningRegion: "us-east-1",
}, nil
}),
),
)
Where can I pass in S3ForcePathStyle = true?
Seems I was looking in the wrong place. The documentation here explains that in aws-sdk-go-v2 they moved the service-specific configuration flags to the individual service client option types. Ironically to improve discoverability.
I should set the UsePathStyle like this:
client := s3.NewFromConfig(conf, func(o *s3.Options) {
o.UsePathStyle = true
})
Related
I'm trying to migrate from aws-sdk-go to aws-sdk-go-v2. But, I am using localstack locally to mimic some aws services such as sqs and s3. I'm not sure how to configure the new sdk to use the localstack endpoint instead of the real one.
For example, in the v1 SDK I can point it to localstack by setting the endpoint here:
session.Must(session.NewSession(&aws.Config{
Region: aws.String("us-east-1"),
Endpoint: aws.String("http://localstack:4566"),
}))
But, how do I do this in the v2 SDK? I think I need to set some param in the config but I dont see any option to specify the endpoint.
So if you go trudging through the python code, principally this, you'll see:
https://github.com/localstack/localstack/blob/25ba1de8a8841af27feab54b8d55c80ac46349e2/localstack/services/edge.py#L115
I then needed to overwrite the authorization header, when using the v2 aws golang sdk in order to add the correct structure.
I picked the structure up from running the aws cli tool and trace logging the localstack docker container:
'Authorization': 'AWS4-HMAC-SHA256 Credential=AKIAR2X5NRNSRTCOJHCI/20210827/eu-west-1/sns/aws4_request, SignedHeaders=content-type;host;x-amz-date, Signature=c69672d38631752ede15d90e7047a5183ebf3707a228decf6ec26e97fdbd02aa',
In go I then needed to overwrite the http client to add that header in:
type s struct {
cl http.Client
}
func (s s) Do(r *http.Request) (*http.Response, error) {
r.Header.Add("authorization", "AWS4-HMAC-SHA256 Credential=AKIAR2X5NRNSRTCOJHCI/20210827/eu-west-1/sns/aws4_request, SignedHeaders=content-type;host;x-amz-date, Signature=33fa777a3bb1241f30742419b8fab81945aa219050da6e29b34db16053661000")
return s.cl.Do(r)
}
func NewSNS(endpoint, topicARN string) (awsPubSub, error) {
cfg := aws.Config{
EndpointResolver: aws.EndpointResolverFunc(func(service, region string) (aws.Endpoint, error) {
return aws.Endpoint{
PartitionID: "aws",
URL: "http://localhost:4566",
SigningRegion: "eu-west-1",
HostnameImmutable: true,
// Source: aws.EndpointSourceCustom,
}, nil
}),
HTTPClient: s{http.Client{}},
}
....
It was very time consuming and painful and I'd love to know a better way, but this works for the time being...
It depends from the service that you use.
In order to initialize a Glue client:
cfg, err := config.LoadDefaultConfig(context.Background())
if err != nil {
panic(err)
}
glueConnection := glue.New(glue.Options{Credentials: cfg.Credentials, Region: cfg.Region})
The equivalent of your code in the SDK v2 is:
cfg, err := config.LoadDefaultConfig(
ctx,
config.WithRegion("us-east-1"),
config.WithEndpointResolverWithOptions(aws.EndpointResolverWithOptionsFunc(
func(service, region string, options ...interface{}) (aws.Endpoint, error) {
return aws.Endpoint{URL: "http://localhost:4566"}, nil
}),
),
)
Using LoadDefaultConfig you will not need to specify the region if you already set it up on the AWS config. You can read more on the AWS SDK v2 docs.
You can find the above example in the package docs.
I'm looking to integrade an S3 bucket with an API im developing, I'm running into this error wherever I go -
SignatureDoesNotMatch: The request signature we calculated does not match the signature you provided. Check your key and signing method.
status code: 403
I have done the following
Installed SDK & AWS CLI, and AWS configured
Double(triple) checked spelling of key & secret key & bucket permissions
Attempted with credentials document, .env, and even hard coding the values directly
Tested with AWS CLI (THIS WORKS), so I believe I can rule out permissions, keys, as a whole.
I'm testing by trying to list buckets, here is the code taken directly from the AWS documentation-
sess := session.Must(session.NewSessionWithOptions(session.Options{ <--- DEBUGGER SET HERE
SharedConfigState: session.SharedConfigEnable,
}))
svc := s3.New(sess)
result, err := svc.ListBuckets(nil)
if err != nil { exitErrorf("Unable to list buckets, %v", err) }
for _, b := range result.Buckets {
fmt.Printf("* %s created on %s\n", aws.StringValue(b.Name), aws.TimeValue(b.CreationDate))
}
Using debugger, I can see the sessions config files as the program runs, the issue is potentially here
config -
-> credentials
-> creds
-> v
-> Access Key = ""
-> Secret Access Key = ""
-> Token = ""
-> provider
->value
-> Access Key With Value
-> Secret Access Key With Value
-> Token With Value
I personally cannot find any documentation regarding "creds" / "v", and I don't know if this is causing the issue. As I mentioned, I can use the AWS CLI to upload into the bucket, and even when I hard code my access key etc in to the Go SDK I receive this error.
Thank you for any thoughts, greatly appreciated.
I just compiled your code and its executing OK ... one of the many ways to supply credentials to your binary is to populate these env vars
export AWS_ACCESS_KEY_ID=AKfoobarT2IJEAU4
export AWS_SECRET_ACCESS_KEY=oa6oT0Xxt4foobarbambazdWFCb
export AWS_REGION=us-west-2
that is all you need when using the env var approach ( your values are available using the aws console browser )
the big picture is to create a wrapper shell script ( bash ) which contains above three lines to populate the env vars to supply credentials then in same shell script execute the golang binary ( typically you compile the golang in some preliminary process ) ... in my case I store the values of my three env vars in encrypted files which the shell script decrypts just before it calls the above export commands
sometimes its helpful to drop kick and just use the aws command line equivalent commands to get yourself into the ballpark ... from a terminal run
aws s3 ls s3://cairo-mombasa-zaire --region us-west-2
which can also use those same env vars shown above
for completeness here is your code with boilerplate added ... this runs OK and lists out the buckets
package main
import (
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
// "github.com/aws/aws-sdk-go/service/s3/s3manager"
"fmt"
"os"
)
func exitErrorf(msg string, args ...interface{}) {
fmt.Fprintf(os.Stderr, msg+"\n", args...)
os.Exit(1)
}
func main() {
region_env_var := "AWS_REGION"
curr_region := os.Getenv(region_env_var)
if curr_region == "" {
exitErrorf("ERROR - failed to get region from env var %v", region_env_var)
}
fmt.Println("here is region ", curr_region)
// Load session from shared config
sess := session.Must(session.NewSessionWithOptions(session.Options{
SharedConfigState: session.SharedConfigEnable,
}))
svc := s3.New(sess)
result, err := svc.ListBuckets(nil)
if err != nil { exitErrorf("Unable to list buckets, %v", err) }
for _, b := range result.Buckets {
fmt.Printf("* %s created on %s\n", aws.StringValue(b.Name), aws.TimeValue(b.CreationDate))
}
}
numBytes, err := downloader.Download(tempFile,
&s3.GetObjectInput{
Bucket: aws.String(bucket),
Key: aws.String(fileName),
},
)
In my case the bucket value was wrong, it is missing literal "/" at the end. Adding that fixes my problem.
Error i got - err: SignatureDoesNotMatch: The request signature we calculated does not match the signature you provided. Check your key and signing method.
status code: 403,
If anyone else happens to have this problem,
The issue was regarding environment variables much like Scott suggest above, however it was due to lacking
export AWS_SDK_LOAD_CONFIG="true"
If this environment variable is not present, then the Golang SDK will not look for a credentials file, along with this, I instantiated environment variables for both my keys which allowed the connection to succeed.
To recap
if you're attempting to use the shared credentials folder, you must use the above noted environment variable to enable it.
If you're using environment variables, you shouldn't be affected by this problem.
AWS Config has a set of Managed Rules and I am trying to use the Golang AWS SDK to use the DescribeConfigRules API to retrieve the list of AWS Config Managed Rule Names and other details.
It seems like every request receives a response of 25 rules and a NextToken for the next set of results. What I am having trouble understanding is how do I use this NextToken to retrieve the next set of results?
Here is what I have so far.
package main
import (
"fmt"
"log"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/configservice"
)
func main() {
//Create an aws session
sess, err := session.NewSession(&aws.Config{Region: aws.String("us-west-2"), Credentials: credentials.NewSharedCredentials("", "my-aws-profile")})
// Create a ConfigService client from just a session.
configsvc := configservice.New(sess)
rules := (*configservice.DescribeConfigRulesInput)(nil)
configrulesoutput, err := configsvc.DescribeConfigRules(rules)
if err != nil {
log.Fatal(err)
}
for _, rule := range configrulesoutput.ConfigRules {
fmt.Println("Rule: ", *rule.ConfigRuleName)
}
}
The above code successfully prints the first 25 rules received in the response. However I am not sure how to use the NextToken received in the response to get the next set of results.
Sample Response.
ConfigRules: [
{
ConfigRuleArn: "ConfigRuleARN",
ConfigRuleId: "config-rule-ppwclr",
ConfigRuleName: "cloudtrail-enabled",
ConfigRuleState: "ACTIVE",
Description: "Checks whether AWS CloudTrail is enabled in your AWS account. Optionally, you can specify which S3 bucket, SNS topic, and Amazon CloudWatch Logs ARN to use.",
InputParameters: "{}",
MaximumExecutionFrequency: "TwentyFour_Hours",
Source: {
Owner: "AWS",
SourceIdentifier: "CLOUD_TRAIL_ENABLED"
}
},
{ Rule 2 }, ....{ Rule 25}
],
NextToken: "nexttoken"
}
Code extracts the rulenames from the response and output is as below.
Rule: cloudtrail-enabled
Rule: restricted-ssh
Rule: securityhub-access-keys-rotated
Rule: securityhub-autoscaling-group-elb-healthcheck-required
Rule: securityhub-cloud-trail-cloud-watch-logs-enabled
Rule: securityhub-cloud-trail-encryption-enabled
Rule: securityhub-cloud-trail-log-file-validation-enabled
Rule: securityhub-cloudtrail-enabled
Rule: securityhub-cmk-backing-key-rotation-enabled
Rule: securityhub-codebuild-project-envvar-awscred-check
Rule: securityhub-codebuild-project-source-repo-url-check
Rule: securityhub-ebs-snapshot-public-restorable-check
Rule: securityhub-ec2-managedinstance-patch-compliance
Rule: securityhub-ec2-security-group-attached-to-eni
Rule: securityhub-eip-attached
Rule: securityhub-elasticsearch-encrypted-at-rest
Rule: securityhub-elasticsearch-in-vpc-only
Rule: securityhub-iam-password-policy-ensure-expires
Rule: securityhub-iam-password-policy-lowercase-letter-check
Rule: securityhub-iam-password-policy-minimum-length-check
Rule: securityhub-iam-password-policy-number-check
Rule: securityhub-iam-password-policy-prevent-reuse-check
Rule: securityhub-iam-password-policy-symbol-check
Rule: securityhub-iam-password-policy-uppercase-letter-check
Rule: securityhub-iam-policy-no-statements-with-admin-access
End Goal: Using golang AWS SDK, extract the AWS Config Managed Rule details and put it in an excel format using Excelize to review which AWS Config rules we want enabled.
Thanks for your help in advance.
---New based on #Adrian's comment and doc reference---
As per doc
type DescribeConfigRulesInput struct {
// The names of the AWS Config rules for which you want details. If you do not
// specify any names, AWS Config returns details for all your rules.
ConfigRuleNames []*string `type:"list"`
// The nextToken string returned on a previous page that you use to get the
// next page of results in a paginated response.
NextToken *string `type:"string"`
// contains filtered or unexported fields }
So here is what I am trying. Specifying nil should give me back all rules. nextToken is blank string for the first call.
configsvc := configservice.New(sess)
rules := (*configservice.DescribeConfigRulesInput)(nil)
nextToken := ""
rules.SetNextToken(nextToken)
getConfigRulesFunc(configsvc, rules)
//getConfigRulesFunc function
func getConfigRulesFunc(cfgsvc *configservice.ConfigService, ruleset *configservice.DescribeConfigRulesInput) {
configrulesoutput, err := cfgsvc.DescribeConfigRules(ruleset)
if err != nil {
log.Fatal(err)
}
for i, r := range configrulesoutput.ConfigRules {
fmt.Println("Rule: ", i, ""+*r.ConfigRuleName)
}
if *configrulesoutput.NextToken != "" {
ruleset := (*configservice.DescribeConfigRulesInput)(nil)
ruleset.SetNextToken(*configrulesoutput.NextToken)
getConfigRulesFunc(cfgsvc, ruleset)
}
}
Above code compiles fine but here the runtime error I believe because of nil.
configsvc type: *configservice.ConfigService
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x13c7ed2]
goroutine 1 [running]:
github.com/aws/aws-sdk-go/service/configservice.(*DescribeConfigRulesInput).SetNextToken(...)
/Users/user/go/src/github.com/aws/aws-sdk-go/service/configservice/api.go:12230
main.main()
/Users/user/golang/awsgotest/awsgotest.go:26 +0x232
Ok, finally figured it out with the help of a very kind Alex Diehl via this ticket https://github.com/aws/aws-sdk-go/issues/3293 on the official aws-sdk-go repo.
I would still say the aws sdk for go definitely lacks simple examples for configservice at the least on recommended usage.
Here the code that works. This will also show how to use simple recursive function in go to use NextToken for pagination of api results that span multiple pages especially apis that do not have built in paginators.
Also note that DescribeConfigRules API does not list all AWS Managed Config Rules, only the Config rules enabled for your account.
package main
import (
"fmt"
"log"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/configservice"
)
var i int = 0
func main() {
sess, err := session.NewSession(&aws.Config{Region: aws.String("us-west-2"), Credentials: credentials.NewSharedCredentials("", "my-profile")})
if err != nil {
log.Fatal(err)
}
//Create a ConfigService client from just a session.
configsvc := configservice.New(sess)
fmt.Printf("configsvc type: %T\n", configsvc)
rules := &configservice.DescribeConfigRulesInput{}
getConfigRulesFunc(configsvc, rules)
}
func getConfigRulesFunc(cfgsvc *configservice.ConfigService, ruleset *configservice.DescribeConfigRulesInput) {
configrulesoutput, err := cfgsvc.DescribeConfigRules(ruleset)
if err != nil {
log.Fatal(err)
}
for _, r := range configrulesoutput.ConfigRules {
fmt.Println("Rule: ", i, ""+*r.ConfigRuleName)
i = i + 1
}
if configrulesoutput.NextToken != nil {
fmt.Println("In if nexttoken is not empty")
fmt.Println("Print NextToken: ", *configrulesoutput.NextToken)
ruleset := &configservice.DescribeConfigRulesInput{}
ruleset.SetNextToken(*configrulesoutput.NextToken)
getConfigRulesFunc(cfgsvc, ruleset)
}
}
Code in Bold were the ones giving me grief on how to use the NextToken based on best practices atleast for the go sdk for aws.
FYI, you could have looked in the AWS Go guide as there is a section on pagination: https://docs.aws.amazon.com/sdk-for-go/v1/developer-guide/making-requests.html#using-pagination-methods.
I'm using the following code to create a presigned put url:
svc := s3.New(nil)
req, _ := svc.PutObjectRequest(&s3.PutObjectInput{
Bucket: aws.String("myBucket"),
Key: aws.String("myKey"),
})
str, err := req.Presign(15 * time.Minute)
log.Println("The URL is:", str, " err:", err)
But I would like to get the configuration from a environment variable:
CONFIGURATIONS={ "Bucket": "myBucket", "Key": "myKey" }
I have just two weeks of Golang, and I have mainly a background in Node.js, so, I'm sorry if this question is very basic.
To better illustrate, I'm trying to do this... but in Go:
const CONFIGURATIONS = JSON.parse(process.env.CONFIGURATIONS)
const S3 = new AWS.S3()
S3.generatePresignedUrl('putObject', CONFIGURATIONS, callback...)
Thank you very much!
If I understand your question correctly you need to retrieve the bucket and key name from env variables. This is pretty easy to do in go. The os package has a GetEnv function for that.
Assuming your env variables are called AWS_BUCKET and AWS_KEY this is the way to get the values:
bucketName := Getenv("AWS_BUCKET")
key := Getenv("AWS_KEY")
You can check the package docs here.
I want to create EMR clusters using AWS SDK for Go, but I can't find a way in the official documentation.
Package: emr — AWS SDK for Go
Cound you please help me with a detailed code?
Actually, coming up to the same problem, there is a way which is described in the documentation. For me, it was not straightforward as well because the wording is different. It appears that a "running a job flow" is basically what equals creating a cluster and adding steps to it.
So what you want is the function RunJobFlow found here:
https://docs.aws.amazon.com/sdk-for-go/api/service/emr/EMR.html#RunJobFlow-instance_method
So, a simple code example which creates a cluster without steps is the following (make sure you have correct credentials configured):
package main
import (
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/emr"
)
func main() {
sess := session.New(&aws.Config{Region: aws.String("eu-west-1")})
svc := emr.New(sess)
params := &emr.RunJobFlowInput{
Instances: &emr.JobFlowInstancesConfig{ // Required
Ec2KeyName: aws.String("keyname"),
HadoopVersion: aws.String("2.7.2"),
InstanceCount: aws.Int64(1),
KeepJobFlowAliveWhenNoSteps: aws.Bool(true),
MasterInstanceType: aws.String("m1.medium"),
Placement: &emr.PlacementType{
AvailabilityZone: aws.String("eu-west-1a"), // Required
},
TerminationProtected: aws.Bool(true),
},
Name: aws.String("Go Test Cluster"), // Required
Applications: []*emr.Application{
{ // Required
Name: aws.String("Ganglia"),
},
{
Name: aws.String("Spark"),
},
// More values...
},
JobFlowRole: aws.String("EMR_EC2_DefaultRole"),
LogUri: aws.String("s3://aws-logs-0000000000-eu-west-1/elasticmapreduce/"),
ReleaseLabel: aws.String("emr-4.6.0"),
ServiceRole: aws.String("EMR_DefaultRole"),
VisibleToAllUsers: aws.Bool(true),
}
resp, err := svc.RunJobFlow(params)
if err != nil {
// Print the error, cast err to awserr.Error to get the Code and
// Message from an error.
fmt.Println(err.Error())
return
}
// Pretty-print the response data.
fmt.Println(resp)
}