Using ARA API clients

When installing ARA, you are provided with a REST API server and two API clients out of the box:

  • AraOfflineClient can query the API without needing an API server to be running
  • AraHttpClient is meant to query a specified API server over http

ARA Offline API client

If your use case doesn’t require a remote or persistent API server, the offline client lets you query the API without needing to start an API server.

In order to use this client, you would instanciate it like this:

#!/usr/bin/env python3
# Import the client
from ara.clients.offline import AraOfflineClient

# Instanciate the offline client
client = AraOfflineClient()

Note that, by default, instanciating an offline client will automatically run SQL migrations.

If you expect the migrations to have already been run when you instanciate the client, you can disable automatic SQL migrations with by specifying run_sql_migrations=False:

client = AraOfflineClient(run_sql_migrations=False)

ARA HTTP API client

AraHttpClient works with the same interface, methods and behavior as AraOfflineClient.

You can set your client to communicate with a remote ara-server API by specifying an endpoint parameter:

#!/usr/bin/env python3
# Import the client
from ara.clients.http import AraHttpClient

endpoint = "https://api.demo.recordsansible.org"
# Instanciate the HTTP client with an endpoint where an API server is listening
client = AraHttpClient(endpoint=endpoint)

# SSL verification can be disabled with verify=False
client = AraHttpClient(endpoint=endpoint, verify=False)

Example API usage

For more details on the API endpoints, see API Documentation.

Otherwise, once you’ve instanciated your client, you’re ready to query the API.

Here’s a code example to help you get started:

#!/usr/bin/env python3
# Import the client
from ara.clients.http import AraHttpClient

# Instanciate the HTTP client with an endpoint where an API server is listening
client = AraHttpClient(endpoint="https://api.demo.recordsansible.org")

# Get a list of failed playbooks
# /api/v1/playbooks?status=failed
playbooks = client.get("/api/v1/playbooks", status="failed")

# If there are any results from our query, get more information about the
# failure and print something helpful
template = "{timestamp}: {host} failed '{task}' ({task_file}:{lineno})"

for playbook in playbooks["results"]:
    # Get failed results for the playbook
    results = client.get("/api/v1/results?playbook=%s" % playbook["id"])

    # For each result, print the task and host information
    for result in results["results"]:
        task = client.get("/api/v1/tasks/%s" % result["task"])
        host = client.get("/api/v1/hosts/%s" % result["host"])

        print(template.format(
            timestamp=result["ended"],
            host=host["name"],
            task=task["name"],
            task_file=task["path"],
            lineno=task["lineno"]
        ))

Running this script would then provide an output that looks like the following:

2020-04-18T17:16:13.394056Z: aio1_repo_container-0c92f7a2 failed 'repo_server : Install EPEL gpg keys' (/home/zuul/src/opendev.org/openstack/openstack-ansible-repo_server/tasks/repo_install.yml:16)
2020-04-18T17:14:59.930995Z: aio1_repo_container-0c92f7a2 failed 'repo_server : File and directory setup (root user)' (/home/zuul/src/opendev.org/openstack/openstack-ansible-repo_server/tasks/repo_pre_install.yml:78)
2020-04-18T17:14:57.909155Z: aio1_repo_container-0c92f7a2 failed 'repo_server : Git service data folder setup' (/home/zuul/src/opendev.org/openstack/openstack-ansible-repo_server/tasks/repo_pre_install.yml:70)
2020-04-18T17:14:57.342091Z: aio1_repo_container-0c92f7a2 failed 'repo_server : Check if the git folder exists already' (/home/zuul/src/opendev.org/openstack/openstack-ansible-repo_server/tasks/repo_pre_install.yml:65)
2020-04-18T17:14:56.793499Z: aio1_repo_container-0c92f7a2 failed 'repo_server : Drop repo pre/post command script' (/home/zuul/src/opendev.org/openstack/openstack-ansible-repo_server/tasks/repo_pre_install.yml:53)
2020-04-18T17:14:54.507660Z: aio1_repo_container-0c92f7a2 failed 'repo_server : File and directory setup (non-root user)' (/home/zuul/src/opendev.org/openstack/openstack-ansible-repo_server/tasks/repo_pre_install.yml:32)
2020-04-18T17:14:51.281530Z: aio1_repo_container-0c92f7a2 failed 'repo_server : Create the nginx system user' (/home/zuul/src/opendev.org/openstack/openstack-ansible-repo_server/tasks/repo_pre_install.yml:22)