Goad is an AWS Lambda powered, highly distributed, load testing tool built in Go for the 2016 Gopher Gala.
Goad allows you to load test your websites from all over the world whilst costing you the tiniest fractions of a penny by using AWS Lambda in multiple regions simultaneously.
You can run Goad from your machine using your own AWS credentials. Goad will automatically create the AWS resources you need and execute your test, and display the results broken down by region. This way, you can see how fast your website is from the major regions of the world.
If you just want to try Goad out, visit the Goad.io website and enter the address of the site you want to test.
To build the Goad CLI from scratch, make sure you have a working Go 1.5 workspace (instructions), then:
- Fetch the project with
go get github.com/goadapp/goad
- Install Go bindata:
go get -u github.com/jteeuwen/go-bindata/...
- Run make to build for all supported platforms
Alternatively, run append
windows to just build for one platform, for example:
- You'll find your
goadbinary in the
Goad will read your credentials from
~/.aws/credentials or from the
AWS_SECRET_ACCESS_KEY environment variables (more info).
# Get help: $ goad --help usage: goad [<flags>] [<url>] An AWS Lambda powered load testing tool Flags: -h, --help Display usage information (this message) -n, --requests=2000 Number of requests to perform. Set to 0 in combination with a specified timelimit allows for unlimited requests for the specified time. -c, --concurrency=10 Number of multiple requests to make at a time -t, --timelimit=3600 Seconds to max. to spend on benchmarking -s, --timeout=15 Seconds to max. wait for each response -H, --header=HEADER ... Add Arbitrary header line, eg. 'Accept-Encoding: gzip' (repeatable) -m, --method="GET" HTTP method --body=BODY HTTP request body --json-output=JSON-OUTPUT Optional path to file for JSON result storage --region=us-east-1 ... AWS regions to run in. Repeat flag to run in more then one region. (repeatable) --run-docker execute in docker container instead of aws lambda --create-ini-template create sample configuration file "goad.ini" in current working directory -V, --version Show application version. Args: [<url>] [http[s]://]hostname[:port]/path optional if defined in goad.ini # For example: $ goad -n 1000 -c 5 https://example.com
Note that sites such as https://google.com that employ redirects cannot be tested correctly at this time.
Goad supports to load settings stored in an ini file. It looks for a goad.ini file in the current working directory. Flags set on the command-line will be overwrite these settings.
[general] #url = http://example.com/ timeout = 3600 concurrency = 10 requests = 1000 timelimit = 15 json-output = test-result.json method = GET body = Hello world [regions] us-east-1 ;N.Virginia #us-east-2 ;Ohio #us-west-1 ;N.California #us-west-2 ;Oregon eu-west-1 ;Ireland #eu-central-1 ;Frankfurt #ap-southeast-1 ;Singapore #ap-southeast-2 ;Sydney #ap-northeast-1 ;Tokyo #ap-northeast-2 ;Seoul #sa-east-1 ;Sao Paulo [headers] cache-control: no-cache auth-token: YOUR-SECRET-AUTH-TOKEN
Goad can also be run as a Docker container which exposes the web API:
docker build -t goad . docker run --rm -p 8080:8080 -e AWS_ACCESS_KEY_ID=<your key ID> -e AWS_SECRET_ACCESS_KEY=<your key> goad
You can then execute a load test using WebSocket:
How it works
Goad takes full advantage of the power of Amazon Lambdas and Go's concurrency for distributed load testing. You can use Goad to launch HTTP loads from up to four AWS regions at once. Each lambda can handle hundreds of concurrent connections, we estimate that Goad should be able to achieve peak loads of up to 100,000 concurrent requests.
Running Goad will create the following AWS resources:
- An IAM Role for the lambda function.
- An IAM Role Policy that allows the lambda function to send messages to SQS, to publish logs and to spawn new lambda in case an individual lambda times out on a long running test.
- A lambda function.
- An SQS queue for the test.
A new SQS queue is created for each test run, and automatically deleted after the test is completed. The other AWS resources are reused in subsequent tests.
How it was built
Go CLI and server
Written in pure Go, Goad takes care of instantiating all the AWS resources, collecting results and displaying them. Interestingly, it contains the executable of the Lambda worker, which is also written in Go.
There is also a webapi version, which can be used to serve Goad as a web service. This streams the results using WebSockets.
AWS Lambda instances are bootstrapped using node.js but the actual work on the Lambda instances is performed by a Go process. The HTTP requests are distributed among multiple Lambda instances each running multiple concurrent goroutines, in order to achieve the desired concurrency level with high throughput.
License & Copyright
See the LICENSE file for more details.