Config Gen

This service generates network configuration (network-cfg.json) for CORD POD

Prerequisites:

Install Go (only for local debugging)
Make sure ONOS is reachable either locally or via SSH tunnel (either way is fine)
Make sure devices, hosts are connected and showing up in ONOS
Config-gen server listens on port 1337, so make sure it's available, if not change the ENV VAR CONFIGGEN_ConfigServerPort to the port you wish config-gen to use

To run locally from source (without a container) for debugging:

Run go run congifGen.go
Use CURL to get the JSON output for network-cfg.json (CURL example below)

To run the container/uService:

Use the Makefile to build the container image with command make image
Run the container/service with make run
Example client would use the following CURL command to get the config:

curl -H "Content-Type: application/json" -d '{"switchcount" : 4, "hostcount": 4, "onosip" : "127.0.0.1" }' http://localhost:1337/config/

Where, switchcount, and hostcount are the number of switches & hosts expected to be in the network respectively, and onosip is the ONOS IP (default is 127.0.0.1)

Note:

Every parameter is set by envconfig (https://github.com/kelseyhightower/envconfig)
For the parameters passed to the server through HTTP POST override the config set by envconfig
To modify any of the envvars, please set the ENV VAR with the prefix of CONFIGGEN
List of parameters set by envconfig:

	Port             string `default:"8181"`		//ONOS Port
	IP               string `default:"127.0.0.1"`	//ONOS IP (Default)
	SwitchCount      int    `default:"0"`
	HostCount        int    `default:"0"`
	Username         string `default:"karaf"`
	Password         string `default:"karaf"`
	LogLevel         string `default:"warning" envconfig:"LOG_LEVEL"`
	LogFormat        string `default:"text" envconfig:"LOG_FORMAT"`
	ConfigServerPort string `default:"1337"`		//Config-gen service port default
	ConfigServerIP   string `default:"127.0.0.1"`	//Config-gen service IP