From c3eb8acc0793b9fe18d4bee00349204c414af3f3 Mon Sep 17 00:00:00 2001 From: ramil Date: Fri, 4 Dec 2020 20:00:13 +0300 Subject: [PATCH] initial commit --- .env.example | 11 + .gitignore | 2 + Dockerfile | 20 ++ package.json | 15 ++ src/db.js | 42 ++++ src/error.js | 12 ++ src/etherscan.js | 27 +++ src/index.js | 72 +++++++ src/prometheus.js | 13 ++ yarn.lock | 525 ++++++++++++++++++++++++++++++++++++++++++++++ 10 files changed, 739 insertions(+) create mode 100644 .env.example create mode 100644 .gitignore create mode 100644 Dockerfile create mode 100644 package.json create mode 100644 src/db.js create mode 100644 src/error.js create mode 100644 src/etherscan.js create mode 100644 src/index.js create mode 100644 src/prometheus.js create mode 100644 yarn.lock diff --git a/.env.example b/.env.example new file mode 100644 index 0000000..c161cc3 --- /dev/null +++ b/.env.example @@ -0,0 +1,11 @@ +SERVER_PORT=3000 +SERVER_HOST=127.0.0.1 + +ETHERSCAN_API_KEY= + +# DB Statediff +STATEDIFF_PG_HOST= +STATEDIFF_PG_PORT= +STATEDIFF_PG_USER= +STATEDIFF_PG_PASSWORD= +STATEDIFF_PG_DATABASE= diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..1dcef2d --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +node_modules +.env \ No newline at end of file diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..a54cd9d --- /dev/null +++ b/Dockerfile @@ -0,0 +1,20 @@ +FROM node:10.15.2-alpine + +# 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 + diff --git a/package.json b/package.json new file mode 100644 index 0000000..4c4006d --- /dev/null +++ b/package.json @@ -0,0 +1,15 @@ +{ + "name": "eth-state-metrics", + "version": "1.0.0", + "description": "NodeJS Service to pull last block from etherscan and DB and provide Prometheus metrics", + "main": "index.js", + "license": "MIT", + "private": true, + "dependencies": { + "axios": "^0.21.0", + "dotenv": "^8.2.0", + "express": "^4.17.1", + "pg": "^8.5.1", + "prom-client": "^12.0.0" + } +} diff --git a/src/db.js b/src/db.js new file mode 100644 index 0000000..aeb17c2 --- /dev/null +++ b/src/db.js @@ -0,0 +1,42 @@ +const { Client } = require('pg'); + +class DB { + constructor(type, user, password, database, host, port) { + this.type = type; + this.client = new Client({ + user, + host, + database, + password, + port, + }); + + this.connecting = false; + } + + async getBlockNumber() { + if (!this.connecting) { + await this.connect(); + this.connecting = true; + } + + return this.client.query('SELECT block_number FROM eth.header_cids ORDER BY block_number DESC LIMIT 1') + .then((res) => { + if (res.rows.length) { + return { + type: this.type, + blockNumber: parseInt(res.rows[0].block_number, 10), + } + } + + return null; + }); + + } + + connect() { + return this.client.connect(); + } +} + +module.exports = DB; \ No newline at end of file diff --git a/src/error.js b/src/error.js new file mode 100644 index 0000000..91c5044 --- /dev/null +++ b/src/error.js @@ -0,0 +1,12 @@ + +class AppError extends Error { + constructor(type, message) { + super(`Error ${type}: ${message}`); + this.data = { + type, + message, + } + } +} + +module.exports = AppError; \ No newline at end of file diff --git a/src/etherscan.js b/src/etherscan.js new file mode 100644 index 0000000..075b9d2 --- /dev/null +++ b/src/etherscan.js @@ -0,0 +1,27 @@ +const axios = require('axios'); +const AppError = require('./error'); + +const etherscanClient = axios.create({ + baseURL: 'https://api.etherscan.io', +}); + + +const getBlockNumber = () => { + return etherscanClient.get(`/api?module=proxy&action=eth_blockNumber&apikey=${process.env.ETHERSCAN_API_KEY}`) + .then((response) => { + const data = response.data; + + // console.log(data); + + if (data.status === '0') { + throw new AppError('etherscan', data.result); + } + + return { + type: 'etherscan', + blockNumber: parseInt(data.result, 16), + } + }) +} + +module.exports = {getBlockNumber}; diff --git a/src/index.js b/src/index.js new file mode 100644 index 0000000..ba5e728 --- /dev/null +++ b/src/index.js @@ -0,0 +1,72 @@ +require('dotenv').config() +const express = require('express') +const etherscan = require('./etherscan'); +const AppError = require('./error'); +const prom = require('./prometheus'); +const DB = require('./db'); + +const startServer = () => { + const server = express(); + + server.get('/metrics', async (req, res) => { + try { + res.set('Content-Type', prom.register.contentType) + res.end(await prom.register.metrics()) + } catch (ex) { + res.status(500).end(ex) + } + }); + + server.listen(process.env.SERVER_PORT); +} + +const main = async () => { + startServer(); + + const statediffUser = process.env.STATEDIFF_PG_USER; + const statediffPassword = process.env.STATEDIFF_PG_PASSWORD; + const statediffDB = process.env.STATEDIFF_PG_DATABASE; + const statediffHost = process.env.STATEDIFF_PG_HOST; + const statediffPort = process.env.STATEDIFF_PG_PORT; + + const dbStateDiff = new DB('statediff', statediffUser, statediffPassword, statediffDB, statediffHost, statediffPort) + const dbStateDiffBlockNumber = dbStateDiff.getBlockNumber(); + + // Etherscan + const etherscanBlock = etherscan.getBlockNumber(); + + const results = await Promise.allSettled([ + etherscanBlock, + dbStateDiffBlockNumber, + + ]) + // console.log(results); + + for (const result of results) { + // console.log(result); + + if (result.status === 'rejected') { + if (result.reason instanceof AppError) { + const errorData = result.reason.data; + console.log(errorData.type, errorData.message); + } else { + console.error(result.reason); + } + } else if (result.status === 'fulfilled') { + const value = result.value; + switch (value.type) { + case 'etherscan': + prom.etherscanGauge.set(value.blockNumber); + + break; + case 'statediff': + prom.statediffDBGauge.set(value.blockNumber); + + break; + } + } + } +} + +main().catch((e) => console.error(e)); + diff --git a/src/prometheus.js b/src/prometheus.js new file mode 100644 index 0000000..0088471 --- /dev/null +++ b/src/prometheus.js @@ -0,0 +1,13 @@ +const client = require('prom-client'); + +const collectDefaultMetrics = client.collectDefaultMetrics; +const Registry = client.Registry; +const register = new Registry(); +const prefix = 'eth_state_metrics_'; +collectDefaultMetrics({ register }); + +const etherscanGauge = new client.Gauge({ name: `${prefix}etherscan`, help: 'Etherscan Block Number', registers: [register]}); +const statediffDBGauge = new client.Gauge({ name: `${prefix}statediff_db`, help: 'Statediff DB Block Number', registers: [register]}); + +module.exports = {etherscanGauge, statediffDBGauge, register}; + diff --git a/yarn.lock b/yarn.lock new file mode 100644 index 0000000..a19aa38 --- /dev/null +++ b/yarn.lock @@ -0,0 +1,525 @@ +# THIS IS AN AUTOGENERATED FILE. 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