The goal of this project is to create simple "ping as a service" on google cloud and using node.js as a programming language (with cloud provided applications).
This service is exposes simple REST api, which allows performing http-ping of other service.
Example request:
POST /ping
Content-Type: application/json
{
host: "www.google.com"
path: "/"
}
the service will open a connection to hostname ${entity.host} and performs HEAD request.
Response contains same information as the request + information about the performed ping:
{
"date":1481730759166,
"host":"www.google.com",
"path":"/",
"status":200,
"deltaNs":266871627
}
When the ping is performed, the service also sends a message using google PubSub service to
a topic called pings with the same content.
Ping listener listens to topic pings and stores all incoming events in google DataStore,
into entity called ping-entity.
Reads content of google DataStore, concretely entity ping-cron, where is the list of
continuously monitored services (TODO: make this modifiable - provide CR(UD) API).
Uses ping-service for pinging those services.
The sole public service in this application.
Provides status page, which contains
- interactive graph of pings to monitoring services (uses websocket protocol to get the data)
- ping as a service form
- last 1000 pings in an interactive table
The service provides all APIs necessary for the page to work, so:
- websocket endpoint for continuous stream of ping results
POST /pingfor Ping as a Service (proxy to internalping-service)GET /tablefor table data
Screenshot of the title page:
cd ${service}
npm install
npm start
docker build -t ${imageName} .
make sure you have GCLOUD_PROJECT and GOOGLE_APPLICATION_CREDENTIALS when running locally.