'endpoint_provider' value has no field or method 'post_issue_comment'

[politician]

I would like to post a comment on the initial pull request after it's been merged in the SoT repo.

My copy.bara.sky:

github_api_obj = git.github_api("politician/test2", checker = None)

core.workflow(
    name = "pr",
    origin = git.github_pr_origin(
        url = "git@github.com:politician/test2.git",
        branch = "main",
    ),
    destination = git.github_pr_destination(
        url = "git@github.com:politician/test.git",
        destination_ref = "main",
        integrates = [],
    ),
    origin_files = glob(["**"]),
    authoring = authoring.pass_thru(default = "Github Actions <actions@github.com>"),
    mode = "CHANGE_REQUEST",
    set_rev_id = False,
    transformations = [
        metadata.save_author("ORIGINAL_AUTHOR"),
        metadata.expose_label("GITHUB_PR_NUMBER", new_name = "Closes", separator = " politician/test2#"),
    ],
)

core.workflow(
    name = "push",
    origin = git.origin(
        url = "file:///usr/src/app",
        ref = "main",
    ),
    destination = git.github_destination(
        url = "git@github.com:politician/test2.git",
        push = "main",
    ),
    origin_files = glob(["**"]),
    authoring = authoring.pass_thru(default = "Github Actions <actions@github.com>"),
    mode = "ITERATIVE",
    transformations = [
        metadata.restore_author("ORIGINAL_AUTHOR", search_all_changes = True),
        metadata.expose_label("COPYBARA_INTEGRATE_REVIEW"),
    ],
    after_workflow = [
        github_api_obj.post_issue_comment("GITHUB_PR_NUMBER", "This pull request has been merged from another repository."),
    ],
)

Then I get the error Error: 'endpoint_provider' value has no field or method 'post_issue_comment' when running the push workflow.

Could you please tell me where and how I am supposed to use it to achieve the desired behaviour? Also, I don't need it to run it if there is no label GITHUB_PR_NUMBER defined

[mikelalcon]

def github_notification():
    """After migration action that notifies in GitHub PRs the status of the import."""
    return core.dynamic_feedback(
        impl = _github_notification_impl,
        params = {},
    )

def _github_notification_impl(ctx):
   ctx.console.info("Notifying GitHub about the import")
   pr_number = ctx.revision.labels["GITHUB_PR_NUMBER"][0]
   for effect in ctx.effects:
       if effect.type == "CREATED" or effect.type == "UPDATED":
              ctx.origin.post_issue_comment(int(pr_number), "Your change has been imported!")


...
core.workflow(
    ...
     after_workflow = [git_notification()]
)

You can do it directly by doing:

     after_workflow = [_git_notification_impl] # Note no () at the end.

But the former allows you to add parameters and create a library for the future.

Hope it helps.