Aws_lb_listener_rule and dynamic "condition" block

Terraform
1

Hi,
I stuck creating dynamics conditions in the aws_lb_listener_rule resource.
I need to assign header_host, path_pattern, etc tag dynamically inside the conditions block, but i dont found how to do in the doc (Dynamic Blocks - Configuration Language - Terraform by HashiCorp)

any ideas?
Many Thanks!!

locals {
  conditions = [{
    field = "host_header",
    values = ["example.com"],
    },
    {
      field = "path_pattern",
      values = ["/static/*"],
  }]
}

resource "aws_lb_listener_rule" "path_pattern" {
  listener_arn = aws_lb_listener.test.arn
  priority     = 100

  action {
    type             = "forward"
    target_group_arn = aws_lb_target_group.test.arn
  }

  dynamic "condition" {
    for_each = local.conditions
    content {
      host_header {  # <--- how to assign this tag dynamically (conditions.value.field)??
        values = condition.value.values
      }
    }
  }
}
2

The local defined is a tuple . you can use
for_each = { for i in local.conditions : i.field => i if i.field == “host_header” }

3

Thanks @Karthic, but what is the syntax to do it within a dynamic block?
I tried several ways without luck, and in the doc there are not examples to achieve this.

For example, in previous version of plugin the block to conditions was:

# previuos plugin (don´t remenber which)
  condition {
    field  = "host-header"
    values = ["dev01site.example.com"]
  }

# with dynamic
  dynamic "condition" {
    for_each = local.conditions
    content {
      field  = condition.value.field   # <-- same way all rest of paramaters in block content
      values = condition.value.values
      }
    }

But with current syntaxis not found way to do it

# actual plugin (3.24)
  condition {
    host_header {     # <-- I need assign this tag dinamically, how?
      values = ["example.com"]
    }
  }

# with dynamic

¿?
4

locals {
conditions = [{
field = “host_header”,
values = [“example.com”],
},
{
field = “path_pattern”,
values = ["/static/*"],
}]
hostheader = { for i in local.conditions : i.field => i if i.field == “host_header” }
}

resource “aws_lb_listener_rule” “path_pattern” {
listener_arn = aws_lb_listener.test.arn
priority = 100

action {
type = “forward”
target_group_arn = aws_lb_target_group.test.arn
}

dynamic “condition” {
for_each = local.hostheader
content {
host_header {
values = condition.value[“values”]
}
}
}
}

You mean dynamic block like above does not work? Please correct if any syntax errors are there.

5

Many thanks @Karthic!!

6

I was testing different ALB rules parameters with the new syntax this way, assuming we only keep receiving “host-header” and “path-pattern” fields from previous version modules:

  condition {
    dynamic "host_header" {
      for_each = { for i in var.service_alb_rules : i.field => i if i.field == "host-header" }
      content {
        values = [host_header.value.value]
      }
    }
    dynamic "path_pattern" {
      for_each = { for i in var.service_alb_rules : i.field => i if i.field == "path-pattern" }
      content {
        values = [path_pattern.value.value]
      }
    }
  }

Maybe it gives you some ideas.
Regards.