SIGINT handler, documentation

Dockerfile

@@ -1,20 +1,14 @@
-FROM node:10.15.2-alpine
+FROM node:15.3.0-alpine3.10
 
 # Create app directory
 WORKDIR /app
 
-RUN apk add --no-cache \
-    make g++ git ca-certificates
-
-#RUN npm config set unsafe-perm true && npm install -g typescript ts-node
-
 COPY package*.json ./
 
 RUN yarn
 
 COPY . .
 
-#RUN npm run build
-
 EXPOSE 3000
 
+CMD ["node", "./src/index.js"]

README.md

@@ -0,0 +1,31 @@
+# Prometheus Metrics for Geth-Statediff
+
+Server exposes `/metrics` endpoint with Prometheus metrics:
+* `eth_state_metrics_etherscan` - latest block from Etherscan
+* `eth_state_metrics_statediff_db` - latest block from Statediff Database
+
+## How to run
+
+### Locally
+
+
+```
+# copy config template
+cp .env.example .env
+
+# edit it and set Etherscan API Key and Database Credentials
+
+# run server
+node src/index.js 
+```
+And then open in browser `http://172.17.0.2:3000/metrics`
+
+### Docker 
+
+```
+docker run \
+    -e SERVER_HOST=0.0.0.0 \
+    -e ETHERSCAN_API_KEY=*** \
+    -e STATEDIFF_PG_HOST=*** \
+    -d vulcanize/eth-state-metrics
+```

src/index.js

@@ -1,4 +1,5 @@
 require('dotenv').config()
+var process = require('process')
 const express = require('express')
 const etherscan = require('./etherscan');
 const AppError = require('./error');
@@ -17,7 +18,9 @@ const startServer = () => {
         }
     });
 
-    server.listen(process.env.SERVER_PORT);
+    const serverPort = process.env.SERVER_PORT || 3000;
+    const serverHost = process.env.SERVER_HOST || '127.0.0.1';
+    server.listen(serverPort, serverHost, () => console.log(`Http server running on port ${serverHost}:${serverPort}`));
 }
 
 const main = async () => {
@@ -70,3 +73,7 @@ const main = async () => {
 
 main().catch((e) => console.error(e));
 
+process.on('SIGINT', () => {
+    console.info("Interrupted")
+    process.exit(0)
+})