logiload

programmatic tool for load-testing in node-js for scenarios with heavy logic.

Features overview

• describe your test as a data-structure simply exported by a node-module
• use request parameterization to express your logic
• override any setting given in the scenario usign CLI switches
• writes it's output to patterned file-names
  • output request stat info into req.csv
  • output overview stats into stats.csv
• run modes:
  • to a given number of times to run the scenario (by providing -n )
  • until SIGTERM/SIGINT (by prviding -n-1)
• Command types:
  • req - to fire one or more requests in parallel
  • wait - thinktime between simulated page-views
• uses a bell curve to spread think times for more humanlike behavior

Request parameterization

Parameterizing of parts in request descriptors are done using the tsung placeholders style, i.e using placeholders wrapped with %%_ and %%, example: %%_param1%% will replace this expression with the value in agent.params.param1. agent.params collection starts as a clone of the macro.options.params provided by the user. User may manipulate the agent.params using onResponse(err, response) hook, which is called on a context with reference to agent.

Note in the following example how the 2nd request adds to the cart the product-id returned by the 1st request.

module.exports = 
{ options: 
  { params: 
    { env: "stage"
    }
  , scenario: 
    [ { type: "req"
        req : 
        [ "http://%%_env%%.mydomain.com/promo-data"
        ]
      , onResponse: function(e, r) {
            if (e) throw e;
            this.agent.params.product = JSON.parse(r.body).product
        }
      }
    , { type: "wait", wait: 1500 }
    , { type: "req"
        req: 
        [ { method: "POST"
          , url:    "http://%%_env%%.mydomain.com/addToChart"
          , body:   {
              pid:  "%%_product%%"
            }
          }
        ]
      }
    ]
  }
}

any setting can be overriden usign CLI switches

TBD

Patterned file names

• %a - num of users (corresponds to CLI param -n,--num)
• %r - arrival interval (corresponds to CLI param -a,--arrive-interval)
• %p - sample interval (corresponds to CLI param -p,--sample-interval)
• %t - timestamp or timestamp+tag when tag is provided (tag corresponds to CLI param -t,--tag