added feature to template header

[derHeinz]

Add ability to "template" header values / to use dynamic values on header values.

Addresses those isseus:
#41
#42

[cla-checker-service]

💚 CLA has been signed

[derHeinz]

I cannot find the reason for the failing build, as my changes are to output side of and failure occures on input side. Any ideas on that?

singed the contributor agreement.

[0akarma]

I have built the plugin locally and it works fine to me except a field which type is array and it casts it to the string type.
The error looks like some ci error because it works find in 7.x and 8.x.

[derHeinz]

Thanks for testing @0akarma.
How can this PR be merged soon?

[derHeinz]

@0akarma: guess you tested to add an array type of field to the headers, like so?

...
output {
  rabbitmq {
    ...
    message_properties => {
        headers => {
			MyArray => "%{my-array-containing-value}"
...

[0akarma]

@0akarma: guess you tested to add an array type of field to the headers, like so?

...
output {
  rabbitmq {
    ...
    message_properties => {
        headers => {
			MyArray => "%{my-array-containing-value}"
...

Yes, it can not format the array field timelimit as well which looks like this

"timelimit" => [
    [0] 18000,
    [1] 7200
]

Here are my nested headers.

"headers" => {
          "task" => "%{[@metadata][rabbitmq_headers][task]}"
          "id" => "%{[@metadata][rabbitmq_headers][id]}"
          "rootid" => "%{[@metadata][rabbitmq_headers][root_id]}"
          "parent_id" => "%{[@metadata][rabbitmq_headers][parent_id]}"
          "ignore_result" => "%{[@metadata][rabbitmq_headers][ignore_result]}"
          "retries" => "%{[@metadata][rabbitmq_headers][retries]}"
          "timelimit" => "%{[@metadata][rabbitmq_headers][timelimit]}"
}

[0akarma]

Thanks for testing @0akarma. How can this PR be merged soon?

I will have a try when i finished the test on the back-pressure feature :)

[derHeinz]

@0akarma have you already had the time to check this one?

[derHeinz]

Any progress on this issue?