How to inspect a json response from Ansible URI call

烂漫一生 提交于 2020-01-23 06:41:06

问题


I have a service call that returns system status in json format. I want to use the ansible URI module to make the call and then inspect the response to decide whether the system is up or down

{"id":"20161024140306","version":"5.6.1","status":"UP"}

This would be the json that is returned

This is the ansible task that makes a call:

 - name: check sonar web is up
   uri:
    url: http://sonarhost:9000/sonar/api/system/status
    method: GET
    return_content: yes
    status_code: 200
    body_format: json
    register: data

Question is how can I access data and inspect it as per ansible documentation this is how we store results of a call. I am not sure of the final step which is to check the status.


回答1:


This works for me.

- name: check sonar web is up
uri:
  url: http://sonarhost:9000/sonar/api/system/status
  method: GET
  return_content: yes
  status_code: 200
  body_format: json
register: result
until: result.json.status == "UP"
retries: 10
delay: 30

Notice that result is a ansible dictionary and when you set return_content=yes the response is added to this dictionary and is accessible using json key

Also ensure you have indented the task properly as shown above.




回答2:


You've made the right first step by saving the output into a variable.

The next step is to use either when: or failed_when: statement in your next task, which will then switch based on the contents of the variable. There are a whole powerful set of statements for use in these, the Jinja2 builtin filters, but they are not really linked well into the Ansible documentation, or summarised nicely.

I use super explicitly named output variables, so they make sense to me later in the playbook :) I would probably write yours something like:

- name: check sonar web is up
  uri:
    url: http://sonarhost:9000/sonar/api/system/status
    method: GET
    return_content: yes
    status_code: 200
    body_format: json
    register: sonar_web_api_status_output

- name: do this thing if it is NOT up
  shell: echo "OMG it's not working!"
  when: sonar_web_api_status_output.stdout.find('UP') == -1

That is, the text "UP" is not found in the variable's stdout.

Other Jinja2 builtin filters I've used are:

  • changed_when: "'<some text>' not in your_variable_name.stderr"
  • when: some_number_of_files_changed.stdout|int > 0

The Ansible "Conditionals" docs page has some of this info. This blog post was also very informative.



来源:https://stackoverflow.com/questions/40235550/how-to-inspect-a-json-response-from-ansible-uri-call

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