It seems like it would be really useful to have "await" functionality to go
with the async task stuff - instead of poll or "fire-and-forget", the
ability to start async tasks that are going to take a while and receive
handles to them which can then be used later in the play to wait for them
to succeed or fail to continue.
If this is already possible, I'd appreciate some pointers on how to do it.
I didn't spend a ton of time with the async docs, but I didn't see anything
that seemed to indicate this functionality to me. Did quick searches here,
online and on the project mailing list and didn't see anything either.
I was thinking of something like...
# We're working normally (sequentially)...
- name: Init/update all Git submodules
command: git submodule update --init
# OK, now we're ready to kick off some tasks that are independent of each
other
# and can take quite a while to complete:
- name: Start independent asynchronous background tasks...
async:
# I structured these as a dict to emphasis that they're not running in
# order, like a list might suggest. The keys (user-defined - whatever
# you want) could then be used to access results on the handle.
tasks:
git_lfs_pull:
name: Pull Git LFS files
command: git lfs pull
bundle_install:
name: Install gems with Bundler
bundler:
state: present
# A handle you receive back that can be used to wait for the tasks.
register: async_handle
# Now we can keep working in sequence...
- name: Install some Python packages with Pip
with_items:
- pathlib2
- docker-compose
pip:
name: "{{ item }}"
# ...whatever else as usual...
# OK, now we're at the point where we need the async tasks to be done
- name: Wait for async tasks to be done.
await:
handle: "{{ async_handle }}"
# Once here, we know the async stuff is done and successful (or failed with
the
# usual message, etc.)
- name: Kick off a build...
command: docker-compose build .
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