emicklei / Zazkia
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zazkia is a tool that simulates all kinds of connection problems with a tcp connection (reset,delay,throttle,corrupt).
How does it work ?
In order to apply misbehavior, zazkia must be used as a proxy between a client and service. It will accept tcp connections from a client and for each new one, will create a connection to the target service.
Routes
By specifying routes, you can tell zazkia on what ports to listen and what target to connect to (host and port).
Minimal zazkia-routes.json example
[
{
"label": "oracle",
"service-hostname": "some.host.name",
"service-port": 1521,
"listen-port": 49997
}
]
With this route definition, your application should use "localhost:49997" instead of "some.host.name:1521" in the connection specification. Your application (the client) will setup a tcp connection with zazkia which will setup another tcp connection to oracle (the service).
Initial transport behavior
The transport part of a route configuration can be used to setup the initial behavior of a new connection pair (called link). Using a REST api, the transport behavior can be changed on a per-link basis.
Full zazkia-routes.json example
[
{
"label": "postgresql",
"service-hostname": "some.other.host.name",
"service-port": 5432,
"listen-port": 49998,
"transport": {
"accept-connections": true,
"throttle-service-response": 1000,
"delay-service-response": 100,
"service-response-corrupt-method": "randomize",
"sending-to-client": true,
"receiving-from-client": true,
"sending-to-service": true,
"receiving-from-service": true,
"verbose": true
}
}
]
| transport property | comment | effective values |
|---|---|---|
| accept-connections | whether connections from the client are accepted | true, false |
| throttle-service-response | bytes per second | non-negative integer |
| delay-service-response | milliseconds delay | non-negative integer |
| service-response-corrupt-method | how the bytes are mangled | empty, randomize |
| sending-to-client | whether a response from the service is sent back to the client | true, false |
| receiving-from-client | whether a request from the client is read | true, false |
| sending-to-service | whether a request from the client is sent to the service | true, false |
| receiving-from-service | whether a response from the service is read | true, false |
| verbose | log each message that is transported between client and service | true, false |
Default transport behavior
"transport": {
"accept-connections": true,
"throttle-service-response": 0,
"delay-service-response": 0,
"service-response-corrupt-method": "",
"sending-to-client": true,
"receiving-from-client": true,
"sending-to-service": true,
"receiving-from-service": true,
"verbose": false
}
Build
To build the project locally and test it.
go get -u github.com/jteeuwen/go-bindata/...
Make sure $GOPATH/bin is on your $PATH.
go generate
go test
go build
Run
Defaults (-p 9191 -f zazkia-routes.json)
./zazkia
Dashboard
A simple HTML dashboard is available to change the transport behavior of individual links. See the Swagger tab for documentation of the REST API.
http://localhost:9191
Docker
A Docker image is available on Docker Hub.
Usage
docker run -d -p 9200-9300:9200-9300 -p 9191:9191 -v $(pwd):/data emicklei/zazkia
Zazkia will look for a file called zazkia-routes.json. The web UI will be running on http://localhost:9191 When using Docker, routes must use listener ports in the range 9200-9300 or 3306 (mysql) or 5432 (postgres) or 8080 (tomcat,jboss).
Examples
See the examples folder for simple usecase examples.
Build your own image
GOOS=linux go build && docker build -t emicklei/zazkia:latest .
© 2017, ernestmicklei.com. Apache v2 License. Contributions welcome.