aws_cloudwatch_event_target - http_target - path_parameter_values not created in version >=4.0.0

[stevendjames]

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Terraform CLI and Terraform AWS Provider Version

Affected Resource(s)

terraform: v1.1.7
hashicorp/aws: v4.6.0

Terraform Configuration Files

terraform {
  required_version = "1.1.7"
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "4.6.0"
    }
  }
}

provider "aws" {
  region = "eu-west-2"
}

resource "aws_iam_role" "test_http_params" {
  name                 = "test-http-params"
  
  assume_role_policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": "sts:AssumeRole",
      "Principal": {
        "Service": "events.amazonaws.com"
      },
      "Effect": "Allow",
      "Sid": ""
    }
  ]
}
EOF
}

resource "aws_cloudwatch_event_bus" "test_http_params" {
  name = "test-http-params"
}

resource "aws_cloudwatch_event_rule" "test_http_params" {
  name        = "test-http-params"
  description = "test-http-params"
  event_bus_name = aws_cloudwatch_event_bus.test_http_params.name
  event_pattern = jsonencode({
    source      = [{"prefix": "" }]
  })
}

resource "aws_cloudwatch_event_target" "replication" {
  rule           = aws_cloudwatch_event_rule.test_http_params.name
  event_bus_name = aws_cloudwatch_event_bus.test_http_params.name
  arn            = aws_cloudwatch_event_api_destination.test_http_params.arn
  role_arn       = aws_iam_role.test_http_params.arn
  http_target {
    path_parameter_values = ["param"]
  }
}

resource "aws_cloudwatch_event_connection" "test_http_params" {
  name               = "test_http_params"
  description        = "test"
  authorization_type = "BASIC"

  auth_parameters {
    basic {
      username = "user"
      password = "notarealpassword"
    }
  }
}

resource "aws_cloudwatch_event_api_destination" "test_http_params" {
  name                             = "test_http_params"
  description                      = "An API Destination"
  invocation_endpoint              = "https://fakewebsite.com/*"
  http_method                      = "POST"
  connection_arn                   = aws_cloudwatch_event_connection.test_http_params.arn
}

Expected Behavior

The terraform apply output lists the intended creation of the aws_cloudwatch_event_target with the http_target argument populated as per the configuration:

  # aws_cloudwatch_event_target.replication will be created
  + resource "aws_cloudwatch_event_target" "replication" {
      + arn            = (known after apply)
      + event_bus_name = "test-http-params"
      + id             = (known after apply)
      + role_arn       = (known after apply)
      + rule           = "test-http-params"
      + target_id      = (known after apply)

      + http_target {
          + path_parameter_values = [
              + "param",
            ]
        }
    }

Actual Behavior

After the creation of the resource, examining the aws_cloudwatch_event_target resource from the Terraform state shows an empty http_target argument:

$ terraform state show aws_cloudwatch_event_target.replication                                                                                  # aws_cloudwatch_event_target.replication:
resource "aws_cloudwatch_event_target" "replication" {
    arn            = "arn:aws:events:eu-west-2:xxxxxxxxxxxx:api-destination/test_http_params/5ab84ad6-6273-488b-a00e-9eacb8f3cbca"
    event_bus_name = "test-http-params"
    id             = "test-http-params-test-http-params-terraform-20220322092735940500000001"
    role_arn       = "arn:aws:iam::xxxxxxxxxxxx:role/test-http-params"
    rule           = "test-http-params"
    target_id      = "terraform-20220322092735940500000001"

    http_target {}
}

Steps to Reproduce

1. terraform apply

Important Factoids

hashicorp/aws versions before v4.0.0 work as desired.
v3.75.0 outputs shown below:

  # aws_cloudwatch_event_target.replication will be created
  + resource "aws_cloudwatch_event_target" "replication" {
      + arn            = (known after apply)
      + event_bus_name = "test-http-params"
      + id             = (known after apply)
      + role_arn       = (known after apply)
      + rule           = "test-http-params"
      + target_id      = (known after apply)

      + http_target {
          + path_parameter_values = [
              + "param",
            ]
        }
    }

$ terraform state show aws_cloudwatch_event_target.replication
# aws_cloudwatch_event_target.replication:
resource "aws_cloudwatch_event_target" "replication" {
    arn            = "arn:aws:events:eu-west-2:xxxxxxxxxxxx:api-destination/test_http_params/4646563e-1b35-4612-883c-4b674052e53f"
    event_bus_name = "test-http-params"
    id             = "test-http-params-test-http-params-terraform-20220322093630327500000001"
    role_arn       = "arn:aws:iam::xxxxxxxxxxxx:role/test-http-params"
    rule           = "test-http-params"
    target_id      = "terraform-20220322093630327500000001"

    http_target {
        path_parameter_values = [
            "param",
        ]
    }
}

References

Maybe linked to this change?

• r/cloudwatch_event_target - http_target.path_parameter_values preserve order + validations #22946

[timo-reymann]

In this cases it seems that the path_parameter_values are "emptied":

e. g. with two path parameter values on level WARN the following is logged:

[WARN]  Provider "provider[\"registry.terraform.io/hashicorp/aws\"]" produced an unexpected new value for aws_cloudwatch_event_target.****, but we are tolerating it because it is using the legacy plugin SDK.
    The following problems may be the cause of any confusing errors from downstream operations:
      - .http_target[0].path_parameter_values: element 0 has vanished
      - .http_target[0].path_parameter_values: element 1 has vanished

[DrFaust92]

I can reproduce the issue with an acceptance test. fix coming up.

[github-actions]

This functionality has been released in v4.8.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.