Support JSONPath evaluation on all indexes of an array

[kmickeletto]

I am attempting to parse an array.

{
  "servers": [
    {
      "servername": "server1",
      "serveractiveconn": 0,
      "servertotalconn": 20,
      "serverconnections": [],
      "serverssl": 1,
      "serversslinfo": "",
      "serveractive": true,
      "servererror": "",
      "serverpriority": 0,
      "serveroptional": 0,
      "serverbps": "0 "
    },
    {
      "servername": "server2",
      "serveractiveconn": 0,
      "servertotalconn": 60,
      "serverconnections": [],
      "serverssl": 1,
      "serversslinfo": "",
      "serveractive": true,
      "servererror": "",
      "serverpriority": 0,
      "serveroptional": 0,
      "serverbps": "0 "
    },
    {
      "servername": "server2",
      "serveractiveconn": 0,
      "servertotalconn": 50,
      "serverconnections": [],
      "serverssl": 1,
      "serversslinfo": "",
      "serveractive": true,
      "servererror": "",
      "serverpriority": 0,
      "serveroptional": 1,
      "serverbps": "0 "
    }
  ]
}

What I was hoping to get was if any of .servers[].servererror contained a value, that would be a bad condition. len([BODY].status.servers[].servererror) == 0

This did not work and the only way I have found to make it work is by doing a test for each index of the array. Is there a better way?

Also, is there a better way to check that servererror is empty?

[TwiN]

Unfortunately, 'wildcard' evaluation isn't currently supported. As you've mentioned, the best way to do this is by manually checking each index of the array:

conditions:
  - "len([BODY].status.servers[0].servererror) == 0"
  - "len([BODY].status.servers[1].servererror) == 0"
  - "len([BODY].status.servers[2].servererror) == 0"

This is definitely subpar, especially if you have a dynamic number of servers, in which case I would recommend having an endpoint that allows retrieving a single server by name instead.

The alternative would be to add support for checking all values, which I think would be a good addition to Gatus:

conditions:
  - "len([BODY].status.servers[*].servererror) == 0"

[martinlillemets]

@TwiN Any news regarding support for JsonPath wildcard? I have been using gatus for a few months now and i really like the simplicity of it. I would like to have a central instance that polls each individual gatus (stage,qa,prod, multiple instances on each) and have a simple overview of current state. The condition you mentioned in above comment would be perfect for this. I have too many instances/endpoints to use remote instances experimental feature for this central instance. I am quite inexperienced in golang, but with a little guidance im willing to try to implement the required changes myself and create a PR. I especially like the len + wildcard combination to keep it as a "single" condition. i was thinking of having something like this as a condition (condition based on api/v1/endpoints/statuses)

conditions:
  - "len([BODY].[*].results[0].success == false) == 0"

I definitely do not want each endpoint to have its own "line" in the conditions because my instances check hundreds of endpoints each.