jsonwire-gridWebDriverGrid

This is high-performance scalable implementation of Selenium Grid (hub),

What is Selenium-Grid?

Selenium-Grid allows you run your tests on different machines against different browsers in parallel. That is, running multiple tests at the same time against different machines running different browsers and operating systems. Essentially, Selenium-Grid support distributed test execution. It allows for running your tests in a distributed test execution environment.

Features

• One session per one node, no more no less😺
• Scaling grid-instances for fault-tolerance
• Support and effective management over 9000 nodes, for parallel testing👹
• Single entry point for all your test apps
• Send metrics to statsd
• Support on-demand nodes in Kubernetes cluster (Only if grid running in cluster)

HowTo

Run grid

1. Download last release and unzip
2. cd to jsonwire-grid_vXXX
3. Type export CONFIG_PATH=./config-local-sample.json
4. Type ./jsonwire-grid
5. Grid running!

Run nodes

1. Download selenium
2. java -jar selenium-server-standalone-3.4.0.jar -role node -hub http://127.0.0.1:4444/grid/register
3. Repeat!

Run test

1. Try create session, such as curl -X POST http://127.0.0.1:4444/wd/hub/session -d '{"desiredCapabilities":{"browserName": "firefox"}}'
2. If you see something similar with {"state":null,"sessionId":"515be56a... all right! If not, submit issue

Configuration

Configurations are stored in json files. Example:

{
  "logger": {
    "level": "debug"
  },
  "db": {
    "implementation": "local"
  },
  "grid": {
    "client_type": "selenium",
    "port": 4444,
    "strategy_list": [
      {
        "type": "persistent"
      }
    ],
    "busy_node_duration": "15m",
    "reserved_node_duration": "5m"
  }
}

Logger - Configuration of logger.

Option	Possible values	Description
logger.level	debug, info, warning, error	Logging level.

DB - Configuration of storage.

Option	Possible values	Description
db.implementation	mysql, local, mongo	Select your favorite db, or local storage.
db.connection	see next table	DSN for your db.

Note: Note: Local (in-memory) storage does not support common session storage between grid-instances.

DB implementation	DSN format
mysql	spec, example db_user:db_pass@(db_host:3306)/db_name?parseTime=true (parseTime=true - required option)
local	omit this property, because every instance have its own in-memory storage
mongo	NOTE! Mongo db supports only persistent node strateg and version from 4.0, example mongodb://localhost:27017

Statsd - Configuration of metrics(optional).

Option	Possible values	Description
statsd.host	string	Host of statsd server.
statsd.port	int	Port of statsd server.
statsd.protocol	string	Network protocol.
statsd.prefix	string	Prefix of metrics tag.
statsd.enable	bool	Enable metric.

Grid - Configuration of app.

Option	Possible values	Description
grid.client_type	selenium, wda	Type of used nodes.
grid.port	int	Grid will run on this port.
grid.busy_node_duration	string as 12m, 60s	Max session lifetime, when timeout was elapsed grid will kill the session.
grid.reserved_node_duration	string as 12m, 60s	Max timeout between send request POST /session and opening the browser window. (Deprecated will renamed)
grid.strategy_list	array	List of strategies, if grid not able create session on first strategy it go to next, until list ends. Read more about strategies.

• selenium - http://www.seleniumhq.org/
• wda - agent for WDA

Element of strategy list

Option	Possible values	Description
type	string, see type of strategy.	Host of statsd server.
limit	int, unlimited if equals 0	Max count of active nodes on this strategy.
params	object, dependent on strategy type	Object describes available nodes, ex. docker config, kubernetes config, etc.
node_list	array, dependent on strategy type	Array of objects describing available nodes.
node_list.[].params	object, dependent on strategy type	Object of describing node, ex. image_name, etc.
node_list.[].capabilities_list	array, ex. [{"foo: "bar"}, {"foo: "baz", "ololo": "trololo"}]	array of objects describes available capabilities .

Types of strategy

persistent - using externally started nodes, same as original selenium grid.

Strategy option	Possible values	Description
limit	-	Omit this property, сount of nodes always unlimited.
params	-	Omit this property.
node_list	-	Omit this property.

kubernetes - on-demand nodes in kubernetes cluster.

Strategy option	Possible values	Description
params.namespace	string	Namespace in k8s for on-demand nodes.
params.pod_creation_timeout	string as 12m, 60s	Max waiting time for creating a pod.
node_list.[].params.image	string	Docker image with selenium.
node_list.[].params.port	string	Port of selenium.

API

• /grid/status - a method returns a status of a grid
• /grid/session/info - a returns a session info by session id. Еxample: curl -X http://localhost:4444/grid/session/info?sessionid=9fc185d2-7a3d-4660-877f-cd4ca2a2f5c3