nodejs-seedlink-latencies-proxy

A proxy written for NodeJS that caches channel latencies available from a number of Seedlink servers at a configurable interval. The cached information is made available through a simple HTTP API. The proxy refreshes the latency information automatically.

Installation

npm install

Configuration

Modify config.json to suit your needs. You may configure multiple Seedlink servers latency sources that will be offered through the proxy.

Running

node index.js

Docker

docker build -t seedlink-latencies:1.0 .
docker run -p 8087:8087 [--rm] [-d] [-e "SERVICE_PORT=8087"] [-e "SERVICE_HOST=0.0.0.0"] seedlink-latencies:1.0

Four envrionment variables can passed to Docker run to modify settings at runtime. Otherwise information is read from the built configuration file.

• SERVICE_HOST
• SERVICE_PORT

API

The supported parameters are valid SEED stream identifiers. Multiple stream identifiers may be delimited by a comma.

• network
• station
• location
• channel

Example

$ curl "127.0.0.1:8087?network=GE&station=MARCO&channel=HHZ"

[{
    "network": "GE",
    "station": "MARCO",
    "location": "",
    "channel": "HHZ",
    "end": "2018-07-06T12:44:49.970Z",
    "msLatency": 3542
}]