Service Manager
This package purpose is to register a service in etcd and retrive the service's needed hosts to operate. It relies on config to get the data needed to run, if not present the process will exit.
Install
$ npm install carbono-service-manager
Usage
Server index.js:
var server = app.listen(80, function () {
// Service discovery and registration
require('carbono-service-manager');
});
Config default.json file:
{
"etcd": {
"host": "192.168.0.69",
"port": 7689,
"key" : "cbs1", // The service key in etcd
"alias" : "Carbono Service 1",
"namespace" : "/service-one/", // Optional: Service namespace
"dependencies" : [ // Optional: Service dependencies
{"key" : "cbs6", "alias" : "Carbono Service 6"},
{"key" : "cbs12", "alias" : "Carbono Service 12"},
{"key" : "cbs2", "alias" : "Carbono Service 2"},
{"key" : "cbs7", "alias" : "Carbono Service 7"}
]
}
Server service-6-client.js module:
var etcd = require('carbono-service-manager');
var hostAddress = etcd.getServiceUrl('cbs6');
In Output:
+ Module Carbono Service 1 registered with etcd.
- Service Carbono Service 6 found at etcd.
- Service Carbono Service 12 found at etcd.
- Service Carbono Service 2 found at etcd.
- Service Carbono Service 7 found at etcd.
In case a service is not found or the module is unable to register itself the process will exit.
+ Module Carbono Service 1 registered with etcd.
[ERROR] Finding Carbono Service 6 with etcd:
{"errorCode":100,"message":"Key not found","cause":"","index":141}