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Cassowary is a modern HTTP/S, intuitive & cross-platform load testing tool built in Go for developers, testers and sysadmins. Cassowary draws inspiration from awesome projects like k6, ab & httpstat.
📌 2 Load Testing modes: one standard and one spread mode where URL Paths can be specified from a file (ideal if you want to hit several underlying microservices)
📌 CI Friendly: Well-suited to be part of a CI pipeline step
📌 Flexible metrics: Cloudwatch metrics, Prometheus metrics (pushing metrics to Prometheus PushGateway), JSON file
📌 Configurable: Able to pass in arbitrary HTTP headers, able to configure the HTTP client
📌 Supports GET, POST, PUT & PATCH - POST, PUT and PATCH data can be defined in a file
📌 Cross Platform: One single pre-built binary for Linux, Mac OSX and Windows
📌 Importable - Besides the CLI tool cassowary can be imported as a module in your Go app
📌 Visualizations - Cassowary can export request data as a histogram and boxplot in png format
Grab a pre-built binary from the GitHub Releases page. You can optionally put the cassowary binary in your PATH so you can run cassowary from any location. Alternative you can:
You can install cassowary using the Homebrew package manager on Mac:
$ brew update && brew install cassowaryYou can run cassowary directly by using its official Docker image:
$ docker run rogerw/cassowary:v0.14.1 -u http://www.example.com -c 1 -n 10For local development:
$ GOOS=linux go build -o dist/docker/cassowary cmd/cassowary/*.go
$ docker build -f dist/docker/Dockerfile -t test_cassowary dist/docker
$ docker run test_cassowary -u http://www.example.com -c 1 -n 10Without argument when doing "docker run" it prints help usage
Cassowary can be installed via the Nix package manager.
nix-env -iA cassowary
If you want to roll out your own RPM you can use the spec file cassowary.spec to build an RPM package
Example running cassowary against www.example.com with 100 requests spread out over 10 concurrent users:
$ ./cassowary run -u http://www.example.com -c 10 -n 100
Starting Load Test with 100 requests using 10 concurrent users
100% |████████████████████████████████████████| [1s:0s] 1.256773616s
TCP Connect.....................: Avg/mean=101.90ms Median=102.00ms p(95)=105ms
Server Processing...............: Avg/mean=100.18ms Median=100.50ms p(95)=103ms
Content Transfer................: Avg/mean=0.01ms Median=0.00ms p(95)=0ms
Summary:
Total Req.......................: 100
Failed Req......................: 0
DNS Lookup......................: 115.00ms
Req/s...........................: 79.57Example running cassowary in file slurp mode where all URL paths are specified from an external file (which can also be fetched from http if specified). By default cassowary will, without the -n flag specified, make one request per path specified in the file. However with the -n flag you can also specify how many request you want cassowary to generate against those URL paths. Example:
$ ./cassowary run -u http://localhost:8000 -c 1 -f urlpath.txt
# NOTE: from v0.10.0 and below file slurp mode had it's own command
# $ ./cassowary run-file -u http://localhost:8000 -c 1 -f urlpath.txt
Starting Load Test with 5 requests using 1 concurrent users
[ omitted ]
$ ./cassowary run -u http://localhost:8000 -c 10 -n 100 -f urlpath.txt
Starting Load Test with 100 requests using 10 concurrent users
100% |████████████████████████████████████████| [0s:0s] 599.467161ms
TCP Connect.....................: Avg/mean=1.80ms Median=2.00ms p(95)=3ms
Server Processing...............: Avg/mean=0.90ms Median=0.00ms p(95)=3ms
Content Transfer................: Avg/mean=0.00ms Median=0.00ms p(95)=0ms
Summary:
Total Req.......................: 3925
Failed Req......................: 0
DNS Lookup......................: 2.00ms
Req/s...........................: 6547.48Example exporting cassowary json metrics to a file:
$ ./cassowary run --json-metrics --json-metrics-file=metrics.json -u http://localhost:8000 -c 125 -n 100000
Starting Load Test with 100000 requests using 125 concurrent users
100% |████████████████████████████████████████| [0s:0s] 984.9862ms
TCP Connect.....................: Avg/mean=-0.18ms Median=0.00ms p(95)=1ms
Server Processing...............: Avg/mean=0.16ms Median=0.00ms p(95)=1ms
Content Transfer................: Avg/mean=0.01ms Median=0.00ms p(95)=0ms
Summary:
Total Req.......................: 100000
Failed Req......................: 0
DNS Lookup......................: 2.00ms
Req/s...........................: 101524.27If
json-metrics-fileflag is missing then the default filename isout.json.
Example exporting cassowary metrics to Prometheus by supplying an Prometheus PushGatway URL:
$ ./cassowary run -u http://localhost:8000 -c 125 -n 100000 -p http://pushgatway:9091
Starting Load Test with 100000 requests using 125 concurrent users
[ omitted for brevity ]
Cassowary can export metrics to AWS Cloudwatch just by adding the --cloudwatch flag without a value. Take note that you will need to tell Cassoway which AWS Region you want to use. The easiest way is using an environment variable as shown below:
$ export AWS_REGION=eu-north-1 && ./cassowary run -u http://localhost:8000 -c 125 -n 100000 --cloudwatch
Starting Load Test with 100000 requests using 125 concurrent users
[ omitted for brevity ]
Supply the --histogram flag without a value to let cassowary compute and output a histogram in png format (hist.png in current dir) for the total duration of the requests in ms. Example:
Supply the --boxplot flag without a value to tell cassowary to generate a boxplot visualization in png format (boxplot.png in current dir) for the total duration of the requests in ms
Example hitting a POST endpoint where POST json data is defined in a file:
$ ./cassowary run -u http://localhost:8000/add-user -c 10 -n 1000 --postfile user.json
Starting Load Test with 1000 requests using 10 concurrent users
[ omitted for brevity ]
Example hitting a PATCH endpoint where PATCH json data is defined in a file:
$ ./cassowary run -u http://localhost:8000/add-user -c 5 -n 200 --patchfile user.json
Starting Load Test with 200 requests using 5 concurrent users
[ omitted for brevity ]
Example specifying a duration for your load test, in the command below we specify that we want send 100 requests over a duration of 30 seconds:
$ ./cassowary run -u http://localhost:8000 -n 100 -d 30
Starting Load Test with 100 requests using 1 concurrent users
[ omitted for brevity ]
Example adding an HTTP header when running cassowary
$ ./cassowary run -u http://localhost:8000 -c 10 -n 1000 -H 'Host: www.example.com'
Starting Load Test with 1000 requests using 10 concurrent users
[ omitted for brevity ]
Example disabling http keep-alive (by default keep-alive are enabled):
$ ./cassowary run -u http://localhost:8000 -c 10 -n 1000 --disable-keep-alive
Starting Load Test with 1000 requests using 10 concurrent users
[ omitted for brevity ]
Example specifying ca certificate
$ ./cassowary run -u http://localhost:8000 -c 10 -n 1000 --ca /path/to/ca.pem
Starting Load Test with 1000 requests using 10 concurrent users
[ omitted for brevity ]
Example specifying client authentication for mTLS
$ ./cassowary run -u https://localhost:8443 -c 10 -n 1000 --cert /path/to/client.pem --key /path/to/client-key.pem --ca /path/to/ca.pem
Starting Load Test with 1000 requests using 10 concurrent users
[ omitted for brevity ]
You can run cassowary in a distributed way if you need to scale up the load testing on more than one machine. Simplest way to do that is having access to a Kubernetes cluster. Use the batch type in Kubernetes and in the spec.paralellism key you can specify how many instances of cassowary you want to run simultaneously:
apiVersion: batch/v1
kind: Job
metadata:
name: cassowary
spec:
parallelism: 10
template:
spec:
containers:
- command: ["-u", "http://my-microservice.com:8000", "-c", "1", "-n", "10"]
image: rogerw/cassowary:v0.14.1
name: cassowary
restartPolicy: NeverJust apply this yaml like so:
$ kubectl apply -f cassowary.yamlCassowary can be imported and used as a module in your Go app. Start by fetching the dependency by using go mod:
$ go mod init test && go get github.com/rogerwelin/cassowary/pkg/clientAnd below show a simple example on how to trigger a load test from your code and printing the results:
package main
import (
"encoding/json"
"fmt"
"github.com/rogerwelin/cassowary/pkg/client"
)
func main() {
cass := &client.Cassowary{
BaseURL: "http://www.example.com",
ConcurrencyLevel: 1,
Requests: 10,
DisableTerminalOutput: true,
}
metrics, err := cass.Coordinate()
if err != nil {
panic(err)
}
// print results
fmt.Printf("%+v\n", metrics)
// or print as json
jsonMetrics, err := json.Marshal(metrics)
if err != nil {
panic(err)
}
fmt.Println(string(jsonMetrics))
}More library examples can be found here
Cassowary follows semantic versioning. The public library (pkg/client) may break backwards compatibility until it hits a stable v1.0.0 release.
Contributions are welcome! To request a feature create a new issue with the label feature-request. Find a bug? Please add an issue with the label bugs. Pull requests are also welcomed but please add an issue on the requested feature first (unless it's a simple bug fix or readme change)