Config hash to prevent updates, Jenkins integration

.gitignore

@@ -1 +1,2 @@
 node_modules
+tmp

Jenkinsfile

@@ -0,0 +1,63 @@
+#!/usr/bin/env groovy
+
+pipeline {
+    agent any
+    environment {
+        PROJECT_NAME = 'docker-discover'
+    }
+    stages {
+        stage('Checkout') {
+            steps {
+                script {
+                    if (!env.GIT_COMMITTER_EMAIL) {
+                        env.COMMITTER_EMAIL = sh(
+                            script: 'git --no-pager show -s --format="%ae"',
+                            returnStdout: true
+                        ).trim()
+                    } else {
+                        env.COMMITTER_EMAIL = env.GIT_COMMITTER_EMAIL;
+                    }
+                }
+
+                sh 'printenv'
+            }
+        }
+        stage('Build') {
+            when {
+                branch 'master'
+            }
+            environment {
+                CREDS = credentials('docker-registry')
+            }
+            steps {
+                sh 'docker login --username $CREDS_USR --password $CREDS_PSW $REGISTRY'
+                sh 'docker-compose build --parallel'
+                sh 'docker-compose push'
+            }
+        }
+        stage('Deploy') {
+            when {
+                branch 'master'
+            }
+            steps {
+                sh "docker stack deploy --with-registry-auth --prune --compose-file docker-compose.yml ${env.PROJECT_NAME}"
+            }
+        }
+    }
+    post {
+        always {
+            script {
+                if (!env.COMMITTER_EMAIL) return
+                try {
+                    mail(
+                        to: env.COMMITTER_EMAIL,
+                        subject: "Pipeline: ${env.JOB_NAME} (${env.BUILD_NUMBER}): ${currentBuild.currentResult}",
+                        body: "Check status at ${env.BUILD_URL}"
+                    )
+                } catch (e) {
+                    echo e.toString()
+                }
+            }
+        }
+    }
+}

config.yml

@@ -1,5 +1,5 @@
 delay: 4
-debug: true
+debug: false
 events: [service, node]
 docker:
   socketPath: /var/run/docker.sock

docker-compose.yml

@@ -7,6 +7,7 @@ services:
       NODE_ENV: production
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
+      - data:/tmp/docker-discover
     configs:
       - source: config
         target: /docker-discover/config.yml
@@ -27,3 +28,5 @@ configs:
   ssh:
     external: true
     name: discover_ssh
+volumes:
+  data:

index.js

@@ -3,14 +3,23 @@ let Docker = require('dockerode');
 let handlebars = require('handlebars');
 let ssh = require('node-ssh');
 let fs = require('fs');
+let shajs = require('sha.js');
 let conf = require('./config.yml');
+let package = require('./package.json');
 
 let docker;
 let template;
+let lastInfoHash;
+let appName = package.name;
 let isProduction = process.env.NODE_ENV === 'production';
+let tmpDir = isProduction ? `/tmp/${appName}` : `${__dirname}/tmp`;
+let hashFile = `${tmpDir}/config.hash`;
 
 async function updateProxy() {
     console.log('Updating reverse proxy configuration.');
+
+    // Obtaining Docker settings
+
     let info;
 
     if (!isProduction) {
@@ -28,7 +37,7 @@ async function updateProxy() {
         if (!Array.isArray(ports) || !ports.length) continue;
 
         let name = serviceInfo.Spec.Name;
-        let match = name.match(/(.+)_main$/);
+        let match = name.match(/^(.+)_main$/);
         if (match) name = match[1];
 
         let service = {
@@ -50,17 +59,36 @@ async function updateProxy() {
         }
     }
 
-    let tmpConf = `/tmp/rproxy.${new Date().getTime()}`;
+    // Cheking settings hash
+
+    let infoHash = shajs('sha256')
+        .update(JSON.stringify(services))
+        .digest('hex');
+    console.log('Settings hash:', infoHash);
+
+    if (lastInfoHash == infoHash) {
+        console.log(`Settings haven't changed, aborting.`);
+        return;
+    }
+
+    lastInfoHash = infoHash;
+    fs.writeFileSync(hashFile, infoHash);
+
+    // Creating configuration file
+
+    let tmpConf = `${tmpDir}/config.cfg`;
     let configString = template({info, services});
     fs.writeFileSync(tmpConf, configString);
 
-    if (conf.debug || !isProduction) {
+    if (conf.debug) {
         let delimiter = '#'.repeat(80);
         console.log(delimiter);
         console.log(configString);
         console.log(delimiter);
     }
 
+    // Updating reverse proxies
+
     let files = {
         local: tmpConf,
         remote: conf.rproxy.confPath
@@ -78,14 +106,26 @@ async function updateProxy() {
         await sshClient.dispose();
     }
 
-    fs.unlinkSync(tmpConf);
     console.log('Configuration updated.');
 }
 
 (async() => {
+    console.log('Initializing.');
     let timeoutId;
     docker = new Docker(conf.docker);
     template = handlebars.compile(fs.readFileSync('rproxy.handlebars', 'utf8'));
+
+    try {
+        fs.mkdirSync(tmpDir);
+    } catch (err) {
+        if (err.code != 'EEXIST') throw err;
+    }
+
+    if (fs.existsSync(hashFile)) {
+        lastInfoHash = fs.readFileSync(hashFile, 'utf8');
+        console.log('Saved settings hash:', lastInfoHash);
+    }
+
     await updateProxy();
 
     console.log('Listenig for events.')

package-lock.json

@@ -314,6 +314,15 @@
         }
       }
     },
+    "sha.js": {
+      "version": "2.4.11",
+      "resolved": "https://registry.npmjs.org/sha.js/-/sha.js-2.4.11.tgz",
+      "integrity": "sha512-QMEp5B7cftE7APOjk5Y6xgrbWu+WkLVQwk8JNjZ8nKRciZaByEW6MubieAiToS7+dwvrjGhH8jRXz3MVd0AYqQ==",
+      "requires": {
+        "inherits": "^2.0.1",
+        "safe-buffer": "^5.0.1"
+      }
+    },
     "shell-escape": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/shell-escape/-/shell-escape-0.2.0.tgz",

package.json

@@ -10,6 +10,7 @@
     "dockerode": "^3.0.2",
     "handlebars": "^4.7.2",
     "node-ssh": "^7.0.0",
-    "require-yaml": "0.0.1"
+    "require-yaml": "0.0.1",
+    "sha.js": "^2.4.11"
   }
 }