Gitlab CICD: use functions inside gitlab-ci.yml - gitlab

Question

I have a .gitlab-ci.yml file which allows needs to execute the same function for every step. I have the following and this works.
image:
name: hashicorp/terraform
before_script:
- export MYDATE=$(date "+%d/%m/%y - %H:%M:%S")
stages:
- validate
- plan
validate:
stage: validate
script:
- terraform validate
- 'curl --request POST --header "Authorization: Bearer $bearer" --form "text=$MYDATE $msg" https://api.teams.com/v1/messages'
variables:
msg: "Example1"
plan:
stage: plan
script:
- terraform validate
- 'curl --request POST --header "Authorization: Bearer $bearer" --form "text=$MYDATE $msg" https://api.teams.com/v1/messages'
variables:
msg: "Example2"
Given it is always the same curl command, I wanted to use a function which I declare once and can use in every step. Something along the lines of below snippet.
image:
name: hashicorp/terraform
before_script:
- export MYDATE=$(date "+%d/%m/%y - %H:%M:%S")
.send_message: &send_message
script:
- 'curl --request POST --header "Authorization: Bearer $bearer" --form "text=$MYDATE $msg" https://api.teams.com/v1/messages'
stages:
- validate
- plan
validate:
stage: validate
script:
- terraform validate
- &send_message
variables:
msg: "Example1"
plan:
stage: plan
script:
- terraform validate
- &send_message
variables:
msg: "Example2"
How could I use such a function in a .gitlab-ci.yml file.

Answer 1

you can used include with !reference such as:
functions.yml
.send_message:
script:
- 'curl --request POST --header "Authorization: Bearer $bearer" --form "text=$MYDATE $msg" https://api.teams.com/v1/messages'
.gitlab-ci.yml
include:
- local: functions.yml
default:
image:
name: hashicorp/terraform
before_script:
- export MYDATE=$(date "+%d/%m/%y - %H:%M:%S")
stages:
- validate
- plan
validate:
stage: validate
script:
- terraform validate
- !reference [.send_message, script]
variables:
msg: "Example1"
plan:
stage: plan
script:
- terraform validate
- !reference [.send_message, script]
variables:
msg: "Example2"
ref: https://docs.gitlab.com/ee/ci/yaml/yaml_optimization.html#reference-tags

Answer 2

You can also use a regular old bash function defined at the top:
before_script:
- export MYDATE=$(date "+%d/%m/%y - %H:%M:%S")
- send_bearer () { terraform validate; curl --request POST --header "Authorization: Bearer $bearer" --form "text=$MYDATE $1" https://api.teams.com/v1/messages; }
...
validate:
stage: validate
script:
- send_bearer $msg
variables:
msg: "Example1"
plan:
stage: plan
script:
- send_bearer $msg
variables:
msg: "Example2"