Simplified loads-broker config

[rpappalax]

To simplify test runs, it would be better if we used some other format instead of json (with defaults).

It would also be cool if you could flag "steps" (in this case runs) to be synchronous vs. asynchronous, so you don't have to add staggered run_delays (which only approximate true synchronous activity).

Example TOML format:

name = "Loadtest: Antenna Loadtesting"


[[defaults]]
    volume_mapping = "/var/log:/var/log/:rw"
    docker_series = "antenna_tests"
    instance_region = "us-east-1" 
    instance_type = "c4.2xlarge" 
    container_name = "firefoxtesteng/antenna-loadtests:latest" 
    run_max_time = 600 

    [[defaults.environment_data]]
	URL_SERVER = "https://antenna-loadtest.stage.mozaws.net"
	VERBOSE = ""
	TEST_PROCESSES = 1
	TEST_DURATION = 300
	TEST_CONNECTIONS = 1

[[plans]]
    name = "THRESHOLD TEST"
    description = "Ratchet up test load from below error threshold to above."

    [[plans.steps]]
        name = "***************** WARMUP ***********************"
        instance_count = 2 
	TEST_DURATION = 600

    [[plans.steps]]
        name = "***************** RUN #01 ***********************"
        instance_count = 1 
	TEST_DURATION = 300

    [[plans.steps]]
        name = "***************** RUN #02 ***********************"
        instance_count = 2 
	TEST_DURATION = 300

    [[plans.steps]]
        name = "***************** RUN #03 ***********************"
        instance_count = 4 
	TEST_DURATION = 300

    [[plans.steps]]
        name = "***************** RUN #04 ***********************"
        instance_count = 8 
	TEST_DURATION = 300

[pjenvey]

I also want to move away from JSON, the lack of comments being the biggest pain point IMO. YAML's an obvious alternative but I'd also like to consider what a TOML version would look like.

[rpappalax]

@pjenvey yea, looks like TOML is more or less like INI except that it allows for nesting via indents:
https://github.com/toml-lang/toml

I've updated my example above in TOML format reflecting the true nesting of the env vars.

[rpappalax]

import toml
import pprint


CONF_BROKER = './loads-broker.toml'

pp = pprint.PrettyPrinter(indent=4)
with open(CONF_BROKER) as conffile:

    config = toml.loads(conffile.read())

pp.pprint(config)